// basisu_transcoder.cpp
// Copyright (C) 2019 Binomial LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "basisu_transcoder.h"
#include <limits.h>
#include <vector>

// The supported .basis file header version. Keep in sync with BASIS_FILE_VERSION.
#define BASISD_SUPPORTED_BASIS_VERSION (0x13)

// Set to 1 for fuzz testing. This will disable all CRC16 checks on headers and compressed data.
#ifndef BASISU_NO_HEADER_OR_DATA_CRC16_CHECKS
#define BASISU_NO_HEADER_OR_DATA_CRC16_CHECKS 0
#endif

#ifndef BASISD_SUPPORT_DXT1
#define BASISD_SUPPORT_DXT1 1
#endif

#ifndef BASISD_SUPPORT_DXT5A
#define BASISD_SUPPORT_DXT5A 1
#endif

// Disable all BC7 transcoders if necessary (useful when cross compiling to Javascript)
#if defined(BASISD_SUPPORT_BC7) && !BASISD_SUPPORT_BC7
	#ifndef BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
	#define BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY 0
	#endif
	#ifndef BASISD_SUPPORT_BC7_MODE5
	#define BASISD_SUPPORT_BC7_MODE5 0
	#endif
#endif // !BASISD_SUPPORT_BC7

// BC7 mode 6 opaque only is the highest quality (compared to ETC1), but the tables are massive.
// For web/mobile use you probably should disable this.
#ifndef BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
#define BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY 1
#endif

// BC7 mode 5 supports both opaque and opaque+alpha textures, and uses substantially less memory than BC7 mode 6 and even BC1.
#ifndef BASISD_SUPPORT_BC7_MODE5
#define BASISD_SUPPORT_BC7_MODE5 1
#endif

#ifndef BASISD_SUPPORT_PVRTC1
#define BASISD_SUPPORT_PVRTC1 1
#endif

#ifndef BASISD_SUPPORT_ETC2_EAC_A8
#define BASISD_SUPPORT_ETC2_EAC_A8 1
#endif

#ifndef BASISD_SUPPORT_ASTC
#define BASISD_SUPPORT_ASTC 1
#endif

// Note that if BASISD_SUPPORT_ATC is enabled, BASISD_SUPPORT_DXT5A should also be enabled for alpha support.
#ifndef BASISD_SUPPORT_ATC
#define BASISD_SUPPORT_ATC 1
#endif

// If BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY is 1, opaque blocks will be transcoded to ASTC at slightly higher quality (higher than BC1), but the transcoder tables will be 2x as large.
// This impacts grayscale and grayscale+alpha textures the most.
#ifndef BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY
	#ifdef __EMSCRIPTEN__
		// Let's assume size matters more than quality when compiling with emscripten.
		#define BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY 0
	#else
		// Compiling native, so an extra 64K lookup table is probably acceptable.
		#define BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY 1
	#endif
#endif

#define BASISD_WRITE_NEW_BC7_TABLES				0
#define BASISD_WRITE_NEW_BC7_MODE5_TABLES    0
#define BASISD_WRITE_NEW_DXT1_TABLES			0
#define BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES	0
#define BASISD_WRITE_NEW_ASTC_TABLES			0
#define BASISD_WRITE_NEW_ATC_TABLES				0

#ifndef BASISD_ENABLE_DEBUG_FLAGS
#define BASISD_ENABLE_DEBUG_FLAGS	0
#endif

namespace basisu
{
	bool g_debug_printf;

	void enable_debug_printf(bool enabled)
	{
		g_debug_printf = enabled;
	}

	void debug_printf(const char* pFmt, ...)
	{
#if BASISU_DEVEL_MESSAGES	
		g_debug_printf = true;
#endif
		if (g_debug_printf)
		{
			va_list args;
			va_start(args, pFmt);
			vprintf(pFmt, args);
			va_end(args);
		}
	}
} // namespace basisu

namespace basist
{
#include "basisu_transcoder_tables_bc7_m6.inc"

#if BASISD_ENABLE_DEBUG_FLAGS
	static uint32_t g_debug_flags = 0;
#endif

	uint32_t get_debug_flags()
	{
#if BASISD_ENABLE_DEBUG_FLAGS
		return g_debug_flags;
#else
		return 0;
#endif
	}

	void set_debug_flags(uint32_t f)
	{
		(void)f;
#if BASISD_ENABLE_DEBUG_FLAGS
		g_debug_flags = f;
#endif
	}
	uint16_t crc16(const void* r, size_t size, uint16_t crc)
	{
		crc = ~crc;

		const uint8_t* p = reinterpret_cast<const uint8_t*>(r);
		for (; size; --size)
		{
			const uint16_t q = *p++ ^ (crc >> 8);
			uint16_t k = (q >> 4) ^ q;
			crc = (((crc << 8) ^ k) ^ (k << 5)) ^ (k << 12);
		}

		return static_cast<uint16_t>(~crc);
	}

	const uint32_t g_global_selector_cb[] =
#include "basisu_global_selector_cb.h"
		;

	const uint32_t g_global_selector_cb_size = sizeof(g_global_selector_cb) / sizeof(g_global_selector_cb[0]);

	void etc1_global_selector_codebook::init(uint32_t N, const uint32_t* pEntries)
	{
		m_palette.resize(N);
		for (uint32_t i = 0; i < N; i++)
			m_palette[i].set_uint32(pEntries[i]);
	}

	void etc1_global_selector_codebook::print_code(FILE* pFile)
	{
		fprintf(pFile, "{\n");
		for (uint32_t i = 0; i < m_palette.size(); i++)
		{
			fprintf(pFile, "0x%X,", m_palette[i].get_uint32());
			if ((i & 15) == 15)
				fprintf(pFile, "\n");
		}
		fprintf(pFile, "\n}\n");
	}

	enum etc_constants
	{
		cETC1BytesPerBlock = 8U,

		cETC1SelectorBits = 2U,
		cETC1SelectorValues = 1U << cETC1SelectorBits,
		cETC1SelectorMask = cETC1SelectorValues - 1U,

		cETC1BlockShift = 2U,
		cETC1BlockSize = 1U << cETC1BlockShift,

		cETC1LSBSelectorIndicesBitOffset = 0,
		cETC1MSBSelectorIndicesBitOffset = 16,

		cETC1FlipBitOffset = 32,
		cETC1DiffBitOffset = 33,

		cETC1IntenModifierNumBits = 3,
		cETC1IntenModifierValues = 1 << cETC1IntenModifierNumBits,
		cETC1RightIntenModifierTableBitOffset = 34,
		cETC1LeftIntenModifierTableBitOffset = 37,

		// Base+Delta encoding (5 bit bases, 3 bit delta)
		cETC1BaseColorCompNumBits = 5,
		cETC1BaseColorCompMax = 1 << cETC1BaseColorCompNumBits,

		cETC1DeltaColorCompNumBits = 3,
		cETC1DeltaColorComp = 1 << cETC1DeltaColorCompNumBits,
		cETC1DeltaColorCompMax = 1 << cETC1DeltaColorCompNumBits,

		cETC1BaseColor5RBitOffset = 59,
		cETC1BaseColor5GBitOffset = 51,
		cETC1BaseColor5BBitOffset = 43,

		cETC1DeltaColor3RBitOffset = 56,
		cETC1DeltaColor3GBitOffset = 48,
		cETC1DeltaColor3BBitOffset = 40,

		// Absolute (non-delta) encoding (two 4-bit per component bases)
		cETC1AbsColorCompNumBits = 4,
		cETC1AbsColorCompMax = 1 << cETC1AbsColorCompNumBits,

		cETC1AbsColor4R1BitOffset = 60,
		cETC1AbsColor4G1BitOffset = 52,
		cETC1AbsColor4B1BitOffset = 44,

		cETC1AbsColor4R2BitOffset = 56,
		cETC1AbsColor4G2BitOffset = 48,
		cETC1AbsColor4B2BitOffset = 40,

		cETC1ColorDeltaMin = -4,
		cETC1ColorDeltaMax = 3,

		// Delta3:
		// 0   1   2   3   4   5   6   7
		// 000 001 010 011 100 101 110 111
		// 0   1   2   3   -4  -3  -2  -1
	};

#define DECLARE_ETC1_INTEN_TABLE(name, N) \
	static const int name[cETC1IntenModifierValues][cETC1SelectorValues] = \
	{ \
		{ N * -8,  N * -2,   N * 2,   N * 8 },{ N * -17,  N * -5,  N * 5,  N * 17 },{ N * -29,  N * -9,   N * 9,  N * 29 },{ N * -42, N * -13, N * 13,  N * 42 }, \
		{ N * -60, N * -18, N * 18,  N * 60 },{ N * -80, N * -24, N * 24,  N * 80 },{ N * -106, N * -33, N * 33, N * 106 },{ N * -183, N * -47, N * 47, N * 183 } \
	};

	DECLARE_ETC1_INTEN_TABLE(g_etc1_inten_tables, 1);
	DECLARE_ETC1_INTEN_TABLE(g_etc1_inten_tables16, 16);
	DECLARE_ETC1_INTEN_TABLE(g_etc1_inten_tables48, 3 * 16);
	
	static const uint8_t g_etc_5_to_8[32] = { 0, 8, 16, 24, 33, 41, 49, 57, 66, 74, 82, 90, 99, 107, 115, 123, 132, 140, 148, 156, 165, 173, 181, 189, 198, 206, 214, 222, 231, 239, 247, 255 };

	struct decoder_etc_block
	{
		// big endian uint64:
		// bit ofs:  56  48  40  32  24  16   8   0
		// byte ofs: b0, b1, b2, b3, b4, b5, b6, b7 
		union
		{
			uint64_t m_uint64;

			uint32_t m_uint32[2];

			uint8_t m_bytes[8];

			struct
			{
				signed m_dred2 : 3;
				uint32_t m_red1 : 5;

				signed m_dgreen2 : 3;
				uint32_t m_green1 : 5;

				signed m_dblue2 : 3;
				uint32_t m_blue1 : 5;

				uint32_t m_flip : 1;
				uint32_t m_diff : 1;
				uint32_t m_cw2 : 3;
				uint32_t m_cw1 : 3;

				uint32_t m_selectors;
			} m_differential;
		};

		inline void clear()
		{
			assert(sizeof(*this) == 8);
			basisu::clear_obj(*this);
		}

		inline void set_byte_bits(uint32_t ofs, uint32_t num, uint32_t bits)
		{
			assert((ofs + num) <= 64U);
			assert(num && (num < 32U));
			assert((ofs >> 3) == ((ofs + num - 1) >> 3));
			assert(bits < (1U << num));
			const uint32_t byte_ofs = 7 - (ofs >> 3);
			const uint32_t byte_bit_ofs = ofs & 7;
			const uint32_t mask = (1 << num) - 1;
			m_bytes[byte_ofs] &= ~(mask << byte_bit_ofs);
			m_bytes[byte_ofs] |= (bits << byte_bit_ofs);
		}

		inline void set_flip_bit(bool flip)
		{
			m_bytes[3] &= ~1;
			m_bytes[3] |= static_cast<uint8_t>(flip);
		}

		inline void set_diff_bit(bool diff)
		{
			m_bytes[3] &= ~2;
			m_bytes[3] |= (static_cast<uint32_t>(diff) << 1);
		}

		// Sets intensity modifier table (0-7) used by subblock subblock_id (0 or 1)
		inline void set_inten_table(uint32_t subblock_id, uint32_t t)
		{
			assert(subblock_id < 2);
			assert(t < 8);
			const uint32_t ofs = subblock_id ? 2 : 5;
			m_bytes[3] &= ~(7 << ofs);
			m_bytes[3] |= (t << ofs);
		}

		// Selector "val" ranges from 0-3 and is a direct index into g_etc1_inten_tables.
		inline void set_selector(uint32_t x, uint32_t y, uint32_t val)
		{
			assert((x | y | val) < 4);
			const uint32_t bit_index = x * 4 + y;

			uint8_t* p = &m_bytes[7 - (bit_index >> 3)];

			const uint32_t byte_bit_ofs = bit_index & 7;
			const uint32_t mask = 1 << byte_bit_ofs;

			static const uint8_t s_selector_index_to_etc1[4] = { 3, 2, 0, 1 };
			const uint32_t etc1_val = s_selector_index_to_etc1[val];

			const uint32_t lsb = etc1_val & 1;
			const uint32_t msb = etc1_val >> 1;

			p[0] &= ~mask;
			p[0] |= (lsb << byte_bit_ofs);

			p[-2] &= ~mask;
			p[-2] |= (msb << byte_bit_ofs);
		}

		// Returned encoded selector value ranges from 0-3 (this is NOT a direct index into g_etc1_inten_tables, see get_selector())
		inline uint32_t get_raw_selector(uint32_t x, uint32_t y) const
		{
			assert((x | y) < 4);

			const uint32_t bit_index = x * 4 + y;
			const uint32_t byte_bit_ofs = bit_index & 7;
			const uint8_t* p = &m_bytes[7 - (bit_index >> 3)];
			const uint32_t lsb = (p[0] >> byte_bit_ofs) & 1;
			const uint32_t msb = (p[-2] >> byte_bit_ofs) & 1;
			const uint32_t val = lsb | (msb << 1);

			return val;
		}

		// Returned selector value ranges from 0-3 and is a direct index into g_etc1_inten_tables.
		inline uint32_t get_selector(uint32_t x, uint32_t y) const
		{
			static const uint8_t s_etc1_to_selector_index[cETC1SelectorValues] = { 2, 3, 1, 0 };
			return s_etc1_to_selector_index[get_raw_selector(x, y)];
		}

		inline void set_raw_selector_bits(uint32_t bits)
		{
			m_bytes[4] = static_cast<uint8_t>(bits);
			m_bytes[5] = static_cast<uint8_t>(bits >> 8);
			m_bytes[6] = static_cast<uint8_t>(bits >> 16);
			m_bytes[7] = static_cast<uint8_t>(bits >> 24);
		}

		inline bool are_all_selectors_the_same() const
		{
			uint32_t v = *reinterpret_cast<const uint32_t*>(&m_bytes[4]);

			if ((v == 0xFFFFFFFF) || (v == 0xFFFF) || (!v) || (v == 0xFFFF0000))
				return true;

			return false;
		}

		inline void set_raw_selector_bits(uint8_t byte0, uint8_t byte1, uint8_t byte2, uint8_t byte3)
		{
			m_bytes[4] = byte0;
			m_bytes[5] = byte1;
			m_bytes[6] = byte2;
			m_bytes[7] = byte3;
		}

		inline uint32_t get_raw_selector_bits() const
		{
			return m_bytes[4] | (m_bytes[5] << 8) | (m_bytes[6] << 16) | (m_bytes[7] << 24);
		}

		inline void set_base4_color(uint32_t idx, uint16_t c)
		{
			if (idx)
			{
				set_byte_bits(cETC1AbsColor4R2BitOffset, 4, (c >> 8) & 15);
				set_byte_bits(cETC1AbsColor4G2BitOffset, 4, (c >> 4) & 15);
				set_byte_bits(cETC1AbsColor4B2BitOffset, 4, c & 15);
			}
			else
			{
				set_byte_bits(cETC1AbsColor4R1BitOffset, 4, (c >> 8) & 15);
				set_byte_bits(cETC1AbsColor4G1BitOffset, 4, (c >> 4) & 15);
				set_byte_bits(cETC1AbsColor4B1BitOffset, 4, c & 15);
			}
		}

		inline void set_base5_color(uint16_t c)
		{
			set_byte_bits(cETC1BaseColor5RBitOffset, 5, (c >> 10) & 31);
			set_byte_bits(cETC1BaseColor5GBitOffset, 5, (c >> 5) & 31);
			set_byte_bits(cETC1BaseColor5BBitOffset, 5, c & 31);
		}

		void set_delta3_color(uint16_t c)
		{
			set_byte_bits(cETC1DeltaColor3RBitOffset, 3, (c >> 6) & 7);
			set_byte_bits(cETC1DeltaColor3GBitOffset, 3, (c >> 3) & 7);
			set_byte_bits(cETC1DeltaColor3BBitOffset, 3, c & 7);
		}

		void set_block_color4(const color32& c0_unscaled, const color32& c1_unscaled)
		{
			set_diff_bit(false);

			set_base4_color(0, pack_color4(c0_unscaled, false));
			set_base4_color(1, pack_color4(c1_unscaled, false));
		}

		void set_block_color5(const color32& c0_unscaled, const color32& c1_unscaled)
		{
			set_diff_bit(true);

			set_base5_color(pack_color5(c0_unscaled, false));

			int dr = c1_unscaled.r - c0_unscaled.r;
			int dg = c1_unscaled.g - c0_unscaled.g;
			int db = c1_unscaled.b - c0_unscaled.b;

			set_delta3_color(pack_delta3(dr, dg, db));
		}

		bool set_block_color5_check(const color32& c0_unscaled, const color32& c1_unscaled)
		{
			set_diff_bit(true);

			set_base5_color(pack_color5(c0_unscaled, false));

			int dr = c1_unscaled.r - c0_unscaled.r;
			int dg = c1_unscaled.g - c0_unscaled.g;
			int db = c1_unscaled.b - c0_unscaled.b;

			if (((dr < cETC1ColorDeltaMin) || (dr > cETC1ColorDeltaMax)) ||
				((dg < cETC1ColorDeltaMin) || (dg > cETC1ColorDeltaMax)) ||
				((db < cETC1ColorDeltaMin) || (db > cETC1ColorDeltaMax)))
				return false;

			set_delta3_color(pack_delta3(dr, dg, db));

			return true;
		}

		inline uint32_t get_byte_bits(uint32_t ofs, uint32_t num) const
		{
			assert((ofs + num) <= 64U);
			assert(num && (num <= 8U));
			assert((ofs >> 3) == ((ofs + num - 1) >> 3));
			const uint32_t byte_ofs = 7 - (ofs >> 3);
			const uint32_t byte_bit_ofs = ofs & 7;
			return (m_bytes[byte_ofs] >> byte_bit_ofs) & ((1 << num) - 1);
		}

		inline uint16_t get_base5_color() const
		{
			const uint32_t r = get_byte_bits(cETC1BaseColor5RBitOffset, 5);
			const uint32_t g = get_byte_bits(cETC1BaseColor5GBitOffset, 5);
			const uint32_t b = get_byte_bits(cETC1BaseColor5BBitOffset, 5);
			return static_cast<uint16_t>(b | (g << 5U) | (r << 10U));
		}

		inline color32 get_base5_color_unscaled() const
		{
			return color32(m_differential.m_red1, m_differential.m_green1, m_differential.m_blue1, 255);
		}

		inline uint32_t get_inten_table(uint32_t subblock_id) const
		{
			assert(subblock_id < 2);
			const uint32_t ofs = subblock_id ? 2 : 5;
			return (m_bytes[3] >> ofs) & 7;
		}

		static uint16_t pack_color4(const color32& color, bool scaled, uint32_t bias = 127U)
		{
			return pack_color4(color.r, color.g, color.b, scaled, bias);
		}

		static uint16_t pack_color4(uint32_t r, uint32_t g, uint32_t b, bool scaled, uint32_t bias = 127U)
		{
			if (scaled)
			{
				r = (r * 15U + bias) / 255U;
				g = (g * 15U + bias) / 255U;
				b = (b * 15U + bias) / 255U;
			}

			r = basisu::minimum(r, 15U);
			g = basisu::minimum(g, 15U);
			b = basisu::minimum(b, 15U);

			return static_cast<uint16_t>(b | (g << 4U) | (r << 8U));
		}

		static uint16_t pack_color5(const color32& color, bool scaled, uint32_t bias = 127U)
		{
			return pack_color5(color.r, color.g, color.b, scaled, bias);
		}

		static uint16_t pack_color5(uint32_t r, uint32_t g, uint32_t b, bool scaled, uint32_t bias = 127U)
		{
			if (scaled)
			{
				r = (r * 31U + bias) / 255U;
				g = (g * 31U + bias) / 255U;
				b = (b * 31U + bias) / 255U;
			}

			r = basisu::minimum(r, 31U);
			g = basisu::minimum(g, 31U);
			b = basisu::minimum(b, 31U);

			return static_cast<uint16_t>(b | (g << 5U) | (r << 10U));
		}

		uint16_t pack_delta3(const color32& color)
		{
			return pack_delta3(color.r, color.g, color.b);
		}

		uint16_t pack_delta3(int r, int g, int b)
		{
			assert((r >= cETC1ColorDeltaMin) && (r <= cETC1ColorDeltaMax));
			assert((g >= cETC1ColorDeltaMin) && (g <= cETC1ColorDeltaMax));
			assert((b >= cETC1ColorDeltaMin) && (b <= cETC1ColorDeltaMax));
			if (r < 0) r += 8;
			if (g < 0) g += 8;
			if (b < 0) b += 8;
			return static_cast<uint16_t>(b | (g << 3) | (r << 6));
		}

		static color32 unpack_color5(uint16_t packed_color5, bool scaled, uint32_t alpha = 255)
		{
			uint32_t b = packed_color5 & 31U;
			uint32_t g = (packed_color5 >> 5U) & 31U;
			uint32_t r = (packed_color5 >> 10U) & 31U;

			if (scaled)
			{
				b = (b << 3U) | (b >> 2U);
				g = (g << 3U) | (g >> 2U);
				r = (r << 3U) | (r >> 2U);
			}

			return color32(r, g, b, alpha);
		}

		static void unpack_color5(uint32_t& r, uint32_t& g, uint32_t& b, uint16_t packed_color5, bool scaled)
		{
			color32 c(unpack_color5(packed_color5, scaled, 0));
			r = c.r;
			g = c.g;
			b = c.b;
		}

		static void get_diff_subblock_colors(color32* pDst, uint16_t packed_color5, uint32_t table_idx)
		{
			assert(table_idx < cETC1IntenModifierValues);
			const int* pInten_modifer_table = &g_etc1_inten_tables[table_idx][0];

			uint32_t r, g, b;
			unpack_color5(r, g, b, packed_color5, true);

			const int ir = static_cast<int>(r), ig = static_cast<int>(g), ib = static_cast<int>(b);

			const int y0 = pInten_modifer_table[0];
			pDst[0].set(clamp255(ir + y0), clamp255(ig + y0), clamp255(ib + y0), 255);

			const int y1 = pInten_modifer_table[1];
			pDst[1].set(clamp255(ir + y1), clamp255(ig + y1), clamp255(ib + y1), 255);

			const int y2 = pInten_modifer_table[2];
			pDst[2].set(clamp255(ir + y2), clamp255(ig + y2), clamp255(ib + y2), 255);

			const int y3 = pInten_modifer_table[3];
			pDst[3].set(clamp255(ir + y3), clamp255(ig + y3), clamp255(ib + y3), 255);
		}

		static int clamp255(int x)
		{
			if (x & 0xFFFFFF00)
			{
				if (x < 0)
					x = 0;
				else if (x > 255)
					x = 255;
			}

			return x;
		}

		static void get_block_colors5(color32* pBlock_colors, const color32& base_color5, uint32_t inten_table)
		{
			color32 b(base_color5);

			b.r = (b.r << 3) | (b.r >> 2);
			b.g = (b.g << 3) | (b.g >> 2);
			b.b = (b.b << 3) | (b.b >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0].set(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
			pBlock_colors[1].set(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
			pBlock_colors[2].set(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
			pBlock_colors[3].set(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
		}

		static void get_block_color5(const color32& base_color5, uint32_t inten_table, uint32_t index, uint32_t& r, uint32_t &g, uint32_t &b)
		{
			assert(index < 4);

			uint32_t br = (base_color5.r << 3) | (base_color5.r >> 2);
			uint32_t bg = (base_color5.g << 3) | (base_color5.g >> 2);
			uint32_t bb = (base_color5.b << 3) | (base_color5.b >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			r = clamp255(br + pInten_table[index]);
			g = clamp255(bg + pInten_table[index]);
			b = clamp255(bb + pInten_table[index]);
		}

		static void get_block_color5_r(const color32& base_color5, uint32_t inten_table, uint32_t index, uint32_t &r)
		{
			assert(index < 4);
						
			uint32_t br = (base_color5.r << 3) | (base_color5.r >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			r = clamp255(br + pInten_table[index]);
		}

		static void get_block_colors5_g(int* pBlock_colors, const color32& base_color5, uint32_t inten_table)
		{
			const int g = (base_color5.g << 3) | (base_color5.g >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0] = clamp255(g + pInten_table[0]);
			pBlock_colors[1] = clamp255(g + pInten_table[1]);
			pBlock_colors[2] = clamp255(g + pInten_table[2]);
			pBlock_colors[3] = clamp255(g + pInten_table[3]);
		}

		static void get_block_colors5_bounds(color32* pBlock_colors, const color32& base_color5, uint32_t inten_table, uint32_t l = 0, uint32_t h = 3)
		{
			color32 b(base_color5);

			b.r = (b.r << 3) | (b.r >> 2);
			b.g = (b.g << 3) | (b.g >> 2);
			b.b = (b.b << 3) | (b.b >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0].set(clamp255(b.r + pInten_table[l]), clamp255(b.g + pInten_table[l]), clamp255(b.b + pInten_table[l]), 255);
			pBlock_colors[1].set(clamp255(b.r + pInten_table[h]), clamp255(b.g + pInten_table[h]), clamp255(b.b + pInten_table[h]), 255);
		}

		static void get_block_colors5_bounds_g(uint32_t* pBlock_colors, const color32& base_color5, uint32_t inten_table, uint32_t l = 0, uint32_t h = 3)
		{
			color32 b(base_color5);

			b.g = (b.g << 3) | (b.g >> 2);

			const int* pInten_table = g_etc1_inten_tables[inten_table];

			pBlock_colors[0] = clamp255(b.g + pInten_table[l]);
			pBlock_colors[1] = clamp255(b.g + pInten_table[h]);
		}
	};

	enum dxt_constants
	{
		cDXT1SelectorBits = 2U, cDXT1SelectorValues = 1U << cDXT1SelectorBits, cDXT1SelectorMask = cDXT1SelectorValues - 1U,
		cDXT5SelectorBits = 3U, cDXT5SelectorValues = 1U << cDXT5SelectorBits, cDXT5SelectorMask = cDXT5SelectorValues - 1U,
	};

	static const uint8_t g_etc1_x_selector_unpack[4][256] =
	{
		{
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
			0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
		},
		{
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
			0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1,
			2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 3,
		},

		{
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
			2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3,
		},

		{
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
			2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
		}
	};

	struct dxt1_block
	{
		enum { cTotalEndpointBytes = 2, cTotalSelectorBytes = 4 };

		uint8_t m_low_color[cTotalEndpointBytes];
		uint8_t m_high_color[cTotalEndpointBytes];
		uint8_t m_selectors[cTotalSelectorBytes];

		inline void clear() { basisu::clear_obj(*this); }

		inline uint32_t get_high_color() const { return m_high_color[0] | (m_high_color[1] << 8U); }
		inline uint32_t get_low_color() const { return m_low_color[0] | (m_low_color[1] << 8U); }
		inline void set_low_color(uint16_t c) { m_low_color[0] = static_cast<uint8_t>(c & 0xFF); m_low_color[1] = static_cast<uint8_t>((c >> 8) & 0xFF); }
		inline void set_high_color(uint16_t c) { m_high_color[0] = static_cast<uint8_t>(c & 0xFF); m_high_color[1] = static_cast<uint8_t>((c >> 8) & 0xFF); }
		inline uint32_t get_selector(uint32_t x, uint32_t y) const { assert((x < 4U) && (y < 4U)); return (m_selectors[y] >> (x * cDXT1SelectorBits)) & cDXT1SelectorMask; }
		inline void set_selector(uint32_t x, uint32_t y, uint32_t val) { assert((x < 4U) && (y < 4U) && (val < 4U)); m_selectors[y] &= (~(cDXT1SelectorMask << (x * cDXT1SelectorBits))); m_selectors[y] |= (val << (x * cDXT1SelectorBits)); }

		static uint16_t pack_color(const color32& color, bool scaled, uint32_t bias = 127U)
		{
			uint32_t r = color.r, g = color.g, b = color.b;
			if (scaled)
			{
				r = (r * 31U + bias) / 255U;
				g = (g * 63U + bias) / 255U;
				b = (b * 31U + bias) / 255U;
			}
			return static_cast<uint16_t>(basisu::minimum(b, 31U) | (basisu::minimum(g, 63U) << 5U) | (basisu::minimum(r, 31U) << 11U));
		}

		static uint16_t pack_unscaled_color(uint32_t r, uint32_t g, uint32_t b) { return static_cast<uint16_t>(b | (g << 5U) | (r << 11U)); }
	};

	struct dxt_selector_range
	{
		uint32_t m_low;
		uint32_t m_high;
	};

#if BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
	static dxt_selector_range g_etc1_to_bc7_selector_ranges[] =
	{
		{ 0, 0 },
		{ 1, 1 },
		{ 2, 2 },
		{ 3, 3 },

		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },

		{ 2, 3 },
		{ 0, 1 },
	};
	const uint32_t NUM_ETC1_TO_BC7_M6_SELECTOR_RANGES = sizeof(g_etc1_to_bc7_selector_ranges) / sizeof(g_etc1_to_bc7_selector_ranges[0]);

	static uint32_t g_etc1_to_bc7_m6_selector_range_index[4][4];
		
	static const uint8_t g_etc1_to_bc7_selector_mappings[][4] =
	{
#if 1
		{ 5 * 0, 5 * 0, 5 * 0, 5 * 0 },
		{ 5 * 0, 5 * 0, 5 * 0, 5 * 1 },
		{ 5 * 0, 5 * 0, 5 * 0, 5 * 2 },
		{ 5 * 0, 5 * 0, 5 * 0, 5 * 3 },
		{ 5 * 0, 5 * 0, 5 * 1, 5 * 1 },
		{ 5 * 0, 5 * 0, 5 * 1, 5 * 2 },
		{ 5 * 0, 5 * 0, 5 * 1, 5 * 3 },
		{ 5 * 0, 5 * 0, 5 * 2, 5 * 2 },
		{ 5 * 0, 5 * 0, 5 * 2, 5 * 3 },
		{ 5 * 0, 5 * 0, 5 * 3, 5 * 3 },
		{ 5 * 0, 5 * 1, 5 * 1, 5 * 1 },
		{ 5 * 0, 5 * 1, 5 * 1, 5 * 2 },
		{ 5 * 0, 5 * 1, 5 * 1, 5 * 3 },
		{ 5 * 0, 5 * 1, 5 * 2, 5 * 2 },
		{ 5 * 0, 5 * 1, 5 * 2, 5 * 3 },
		{ 5 * 0, 5 * 1, 5 * 3, 5 * 3 },
		{ 5 * 0, 5 * 2, 5 * 2, 5 * 2 },
		{ 5 * 0, 5 * 2, 5 * 2, 5 * 3 },
		{ 5 * 0, 5 * 2, 5 * 3, 5 * 3 },
		{ 5 * 0, 5 * 3, 5 * 3, 5 * 3 },
		{ 5 * 1, 5 * 1, 5 * 1, 5 * 1 },
		{ 5 * 1, 5 * 1, 5 * 1, 5 * 2 },
		{ 5 * 1, 5 * 1, 5 * 1, 5 * 3 },
		{ 5 * 1, 5 * 1, 5 * 2, 5 * 2 },
		{ 5 * 1, 5 * 1, 5 * 2, 5 * 3 },
		{ 5 * 1, 5 * 1, 5 * 3, 5 * 3 },
		{ 5 * 1, 5 * 2, 5 * 2, 5 * 2 },
		{ 5 * 1, 5 * 2, 5 * 2, 5 * 3 },
		{ 5 * 1, 5 * 2, 5 * 3, 5 * 3 },
		{ 5 * 1, 5 * 3, 5 * 3, 5 * 3 },
		{ 5 * 2, 5 * 2, 5 * 2, 5 * 2 },
		{ 5 * 2, 5 * 2, 5 * 2, 5 * 3 },
		{ 5 * 2, 5 * 2, 5 * 3, 5 * 3 },
		{ 5 * 2, 5 * 3, 5 * 3, 5 * 3 },
		{ 5 * 3, 5 * 3, 5 * 3, 5 * 3 },

		{ 0, 1, 2, 3 },
		{ 0, 0, 1, 1 },
		{ 0, 0, 0, 1 },
		{ 0, 2, 4, 6 },
		{ 0, 3, 6, 9 },
		{ 0, 4, 8, 12 },

		{ 0, 4, 9, 15 },
		{ 0, 6, 11, 15 },

		{ 1, 2, 3, 4 },
		{ 1, 3, 5, 7 },

		{ 1, 8, 8, 14 },
#else
		{ 5 * 0, 5 * 0, 5 * 1, 5 * 1 },
		{ 5 * 0, 5 * 0, 5 * 1, 5 * 2 },
		{ 5 * 0, 5 * 0, 5 * 1, 5 * 3 },
		{ 5 * 0, 5 * 0, 5 * 2, 5 * 3 },
		{ 5 * 0, 5 * 1, 5 * 1, 5 * 1 },
		{ 5 * 0, 5 * 1, 5 * 2, 5 * 2 },
		{ 5 * 0, 5 * 1, 5 * 2, 5 * 3 },
		{ 5 * 0, 5 * 2, 5 * 3, 5 * 3 },
		{ 5 * 1, 5 * 2, 5 * 2, 5 * 2 },
#endif
		{ 5 * 1, 5 * 2, 5 * 3, 5 * 3 },
		{ 8, 8, 8, 8 },
	};
	const uint32_t NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS = sizeof(g_etc1_to_bc7_selector_mappings) / sizeof(g_etc1_to_bc7_selector_mappings[0]);

	static uint8_t g_etc1_to_bc7_selector_mappings_inv[NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS][4];

	// encoding from LSB to MSB: low8, high8, error16, size is [32*8][NUM_ETC1_TO_BC7_M6_SELECTOR_RANGES][NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS]
	extern const uint32_t* g_etc1_to_bc7_m6_table[];

	const uint16_t s_bptc_table_aWeight4[16] = { 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 };

#if BASISD_WRITE_NEW_BC7_TABLES
	static void create_etc1_to_bc7_m6_conversion_table()
	{
		FILE* pFile = NULL;

		pFile = fopen("basisu_decoder_tables_bc7_m6.inc", "w");

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				fprintf(pFile, "static const uint32_t g_etc1_to_bc7_m6_table%u[] = {\n", g + inten * 32);
				uint32_t n = 0;

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_BC7_M6_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_bc7_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_bc7_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 127; hi++)
						{
							for (uint32_t lo = 0; lo <= 127; lo++)
							{
								uint32_t bc7_block_colors[16];

								bc7_block_colors[0] = lo << 1;
								bc7_block_colors[15] = (hi << 1) | 1;

								for (uint32_t i = 1; i < 15; i++)
									bc7_block_colors[i] = (bc7_block_colors[0] * (64 - s_bptc_table_aWeight4[i]) + bc7_block_colors[15] * s_bptc_table_aWeight4[i] + 32) >> 6;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = (int)block_colors[s].g - (int)bc7_block_colors[g_etc1_to_bc7_selector_mappings[m][s]];

									total_err += err * err;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							} // lo

						} // hi

						best_err = basisu::minimum<uint32_t>(best_err, 0xFFFF);

						const uint32_t index = (g + inten * 32) * (NUM_ETC1_TO_BC7_M6_SELECTOR_RANGES * NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS) + (sr * NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS) + m;

						uint32_t v = best_err | (best_lo << 18) | (best_hi << 25);

						fprintf(pFile, "0x%X,", v);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");

					} // m
				} // sr

				fprintf(pFile, "};\n");

			} // g
		} // inten

		fprintf(pFile, "const uint32_t *g_etc1_to_bc7_m6_table[] = {\n");

		for (uint32_t i = 0; i < 32 * 8; i++)
		{
			fprintf(pFile, "g_etc1_to_bc7_m6_table%u, ", i);
			if ((i & 15) == 15)
				fprintf(pFile, "\n");
		}

		fprintf(pFile, "};\n");
		fclose(pFile);
	}
#endif
#endif

	struct etc1_to_dxt1_56_solution
	{
		uint8_t m_lo;
		uint8_t m_hi;
		uint16_t m_err;
	};

#if BASISD_SUPPORT_DXT1
	static dxt_selector_range g_etc1_to_dxt1_selector_ranges[] =
	{
		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },

		{ 2, 3 },
		{ 0, 1 },
	};

	const uint32_t NUM_ETC1_TO_DXT1_SELECTOR_RANGES = sizeof(g_etc1_to_dxt1_selector_ranges) / sizeof(g_etc1_to_dxt1_selector_ranges[0]);

	static uint32_t g_etc1_to_dxt1_selector_range_index[4][4];

	const uint32_t NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS = 10;
	static const uint8_t g_etc1_to_dxt1_selector_mappings[NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS][4] =
	{
		{ 0, 0, 1, 1 },
		{ 0, 0, 1, 2 },
		{ 0, 0, 1, 3 },
		{ 0, 0, 2, 3 },
		{ 0, 1, 1, 1 },
		{ 0, 1, 2, 2 },
		{ 0, 1, 2, 3 },
		{ 0, 2, 3, 3 },
		{ 1, 2, 2, 2 },
		{ 1, 2, 3, 3 },
	};
	
	static uint8_t g_etc1_to_dxt1_selector_mappings_raw_dxt1_256[NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS][256];
	static uint8_t g_etc1_to_dxt1_selector_mappings_raw_dxt1_inv_256[NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS][256];

	static const etc1_to_dxt1_56_solution g_etc1_to_dxt_6[32 * 8 * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS * NUM_ETC1_TO_DXT1_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_dxt1_6.inc"
	};

	static const etc1_to_dxt1_56_solution g_etc1_to_dxt_5[32 * 8 * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS * NUM_ETC1_TO_DXT1_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_dxt1_5.inc"
	};

	// First saw the idea for optimal BC1 single-color block encoding using lookup tables in ryg_dxt.
	struct bc1_match_entry
	{
		uint8_t m_hi;
		uint8_t m_lo;
	};
	static bc1_match_entry g_bc1_match5_equals_1[256], g_bc1_match6_equals_1[256]; // selector 1, allow equals hi/lo
	static bc1_match_entry g_bc1_match5_equals_0[256], g_bc1_match6_equals_0[256]; // selector 0, allow equals hi/lo

	static void prepare_bc1_single_color_table(bc1_match_entry* pTable, const uint8_t* pExpand, int size0, int size1, int sel)
	{
		for (int i = 0; i < 256; i++)
		{
			int lowest_e = 256;
			for (int lo = 0; lo < size0; lo++)
			{
				for (int hi = 0; hi < size1; hi++)
				{
					const int lo_e = pExpand[lo], hi_e = pExpand[hi];
					int e;

					if (sel == 1)
					{
						// Selector 1
						e = abs(((hi_e * 2 + lo_e) / 3) - i) + ((abs(hi_e - lo_e) >> 5));
					}
					else
					{
						assert(sel == 0);

						// Selector 0
						e = abs(hi_e - i);
					}

					if (e < lowest_e)
					{
						pTable[i].m_hi = static_cast<uint8_t>(hi);
						pTable[i].m_lo = static_cast<uint8_t>(lo);

						lowest_e = e;
					}

				} // hi
			} // lo
		}
	}
#endif // BASISD_SUPPORT_DXT1

#if BASISD_WRITE_NEW_DXT1_TABLES
	static void create_etc1_to_dxt1_5_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_dxt1_5.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_DXT1_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_dxt1_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_dxt1_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 31; hi++)
						{
							for (uint32_t lo = 0; lo <= 31; lo++)
							{
								//if (lo == hi) continue;

								uint32_t colors[4];

								colors[0] = (lo << 3) | (lo >> 2);
								colors[3] = (hi << 3) | (hi >> 2);

								colors[1] = (colors[0] * 2 + colors[3]) / 3;
								colors[2] = (colors[3] * 2 + colors[0]) / 3;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_dxt1_selector_mappings[m][s]];

									total_err += err * err;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						assert(best_err <= 0xFFFF);

						//table[g + inten * 32].m_solutions[sr][m].m_lo = static_cast<uint8_t>(best_lo);
						//table[g + inten * 32].m_solutions[sr][m].m_hi = static_cast<uint8_t>(best_hi);
						//table[g + inten * 32].m_solutions[sr][m].m_err = static_cast<uint16_t>(best_err);

						//assert(best_lo != best_hi);
						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
	}

	static void create_etc1_to_dxt1_6_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_dxt1_6.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_DXT1_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_dxt1_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_dxt1_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 63; hi++)
						{
							for (uint32_t lo = 0; lo <= 63; lo++)
							{
								//if (lo == hi) continue;

								uint32_t colors[4];

								colors[0] = (lo << 2) | (lo >> 4);
								colors[3] = (hi << 2) | (hi >> 4);

								colors[1] = (colors[0] * 2 + colors[3]) / 3;
								colors[2] = (colors[3] * 2 + colors[0]) / 3;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_dxt1_selector_mappings[m][s]];

									total_err += err * err;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						assert(best_err <= 0xFFFF);

						//table[g + inten * 32].m_solutions[sr][m].m_lo = static_cast<uint8_t>(best_lo);
						//table[g + inten * 32].m_solutions[sr][m].m_hi = static_cast<uint8_t>(best_hi);
						//table[g + inten * 32].m_solutions[sr][m].m_err = static_cast<uint16_t>(best_err);

						//assert(best_lo != best_hi);
						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");

					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
	}
#endif

#if BASISD_SUPPORT_ETC2_EAC_A8
	enum
	{
		cEAC_A8_BYTES_PER_BLOCK = 8,
		cEAC_A8_SELECTOR_BYTES = 6,
		cEAC_A8_SELECTOR_BITS = 3,
		cEAC_RGBA8_BYTES_PER_BLOCK = 16,
		cEAC_RGBA8_RGB_OFFSET = 8,
		cEAC_RGBA8_A_OFFSET = 0,
		cEAC_A8_MIN_VALUE_SELECTOR = 3,
		cEAC_A8_MAX_VALUE_SELECTOR = 7
	};

	static const int8_t g_eac_a8_modifier_table[16][8] =
	{
		{ -3, -6, -9, -15, 2, 5, 8, 14 },
		{ -3, -7, -10, -13, 2, 6, 9, 12 },
		{ -2, -5, -8, -13, 1, 4, 7, 12 },
		{ -2, -4, -6, -13, 1, 3, 5, 12 },
		{ -3, -6, -8, -12, 2, 5, 7, 11 },
		{ -3, -7, -9, -11, 2, 6, 8, 10 },
		{ -4, -7, -8, -11, 3, 6, 7, 10 },
		{ -3, -5, -8, -11, 2, 4, 7, 10 },

		{ -2, -6, -8, -10, 1, 5, 7, 9 },
		{ -2, -5, -8, -10, 1, 4, 7, 9 },
		{ -2, -4, -8, -10, 1, 3, 7, 9 },
		{ -2, -5, -7, -10, 1, 4, 6, 9 },
		{ -3, -4, -7, -10, 2, 3, 6, 9 },
		{ -1, -2, -3, -10, 0, 1, 2, 9 }, // entry 13
		{ -4, -6, -8, -9, 3, 5, 7, 8 },
		{ -3, -5, -7, -9, 2, 4, 6, 8 }
	};

	struct eac_a8_block
	{
		uint16_t m_base : 8;

		uint16_t m_table : 4;
		uint16_t m_multiplier : 4;

		uint8_t m_selectors[6];

		uint32_t get_selector(uint32_t x, uint32_t y) const
		{
			assert((x < 4) && (y < 4));

			const uint32_t ofs = 45 - (y + x * 4) * 3;

			const uint64_t pixels = get_selector_bits();

			return (pixels >> ofs) & 7;
		}

		void set_selector(uint32_t x, uint32_t y, uint32_t s)
		{
			assert((x < 4) && (y < 4) && (s < 8));

			const uint32_t ofs = 45 - (y + x * 4) * 3;

			uint64_t pixels = get_selector_bits();

			pixels &= ~(7ULL << ofs);
			pixels |= (static_cast<uint64_t>(s) << ofs);

			set_selector_bits(pixels);
		}

		uint64_t get_selector_bits() const
		{
			uint64_t pixels = ((uint64_t)m_selectors[0] << 40) | ((uint64_t)m_selectors[1] << 32) |
				((uint64_t)m_selectors[2] << 24) |
				((uint64_t)m_selectors[3] << 16) | ((uint64_t)m_selectors[4] << 8) | m_selectors[5];
			return pixels;
		}

		void set_selector_bits(uint64_t pixels)
		{
			m_selectors[0] = (uint8_t)(pixels >> 40);
			m_selectors[1] = (uint8_t)(pixels >> 32);
			m_selectors[2] = (uint8_t)(pixels >> 24);
			m_selectors[3] = (uint8_t)(pixels >> 16);
			m_selectors[4] = (uint8_t)(pixels >> 8);
			m_selectors[5] = (uint8_t)(pixels);
		}
	};

#if BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
	struct pack_eac_a8_results
	{
		uint32_t m_base;
		uint32_t m_table;
		uint32_t m_multiplier;
		std::vector<uint8_t> m_selectors;
		std::vector<uint8_t> m_selectors_temp;
	};

	static uint64_t pack_eac_a8_exhaustive(pack_eac_a8_results& results, const uint8_t* pPixels, uint32_t num_pixels)
	{
		results.m_selectors.resize(num_pixels);
		results.m_selectors_temp.resize(num_pixels);

		uint64_t best_err = UINT64_MAX;

		for (uint32_t base_color = 0; base_color < 256; base_color++)
		{
			for (uint32_t multiplier = 1; multiplier < 16; multiplier++)
			{
				for (uint32_t table = 0; table < 16; table++)
				{
					uint64_t total_err = 0;

					for (uint32_t i = 0; i < num_pixels; i++)
					{
						const int a = pPixels[i];

						uint32_t best_s_err = UINT32_MAX;
						uint32_t best_s = 0;
						for (uint32_t s = 0; s < 8; s++)
						{
							int v = (int)multiplier * g_eac_a8_modifier_table[table][s] + (int)base_color;
							if (v < 0)
								v = 0;
							else if (v > 255)
								v = 255;

							uint32_t err = abs(a - v);
							if (err < best_s_err)
							{
								best_s_err = err;
								best_s = s;
							}
						}

						results.m_selectors_temp[i] = static_cast<uint8_t>(best_s);

						total_err += best_s_err * best_s_err;
						if (total_err >= best_err)
							break;
					}

					if (total_err < best_err)
					{
						best_err = total_err;
						results.m_base = base_color;
						results.m_multiplier = multiplier;
						results.m_table = table;
						results.m_selectors.swap(results.m_selectors_temp);
					}

				} // table

			} // multiplier

		} // base_color

		return best_err;
	}
#endif

	static const dxt_selector_range s_etc2_eac_a8_selector_ranges[] =
	{
		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },
	};

	const uint32_t NUM_ETC2_EAC_A8_SELECTOR_RANGES = sizeof(s_etc2_eac_a8_selector_ranges) / sizeof(s_etc2_eac_a8_selector_ranges[0]);

	struct etc1_g_to_etc2_a8_conversion
	{
		uint8_t m_base;
		uint8_t m_table_mul; // mul*16+table
		uint16_t m_trans; // translates ETC1 selectors to ETC2_EAC_A8
	};

	static
#if !BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES		
		const
#endif
		etc1_g_to_etc2_a8_conversion s_etc1_g_to_etc2_a8[32 * 8][NUM_ETC2_EAC_A8_SELECTOR_RANGES] =
	{
		{ { 0,1,3328 },{ 0,1,3328 },{ 0,1,256 },{ 0,1,256 } },
		{ { 0,226,3936 },{ 0,226,3936 },{ 0,81,488 },{ 0,81,488 } },
		{ { 6,178,4012 },{ 6,178,4008 },{ 0,146,501 },{ 0,130,496 } },
		{ { 14,178,4012 },{ 14,178,4008 },{ 8,146,501 },{ 6,82,496 } },
		{ { 23,178,4012 },{ 23,178,4008 },{ 17,146,501 },{ 3,228,496 } },
		{ { 31,178,4012 },{ 31,178,4008 },{ 25,146,501 },{ 11,228,496 } },
		{ { 39,178,4012 },{ 39,178,4008 },{ 33,146,501 },{ 19,228,496 } },
		{ { 47,178,4012 },{ 47,178,4008 },{ 41,146,501 },{ 27,228,496 } },
		{ { 56,178,4012 },{ 56,178,4008 },{ 50,146,501 },{ 36,228,496 } },
		{ { 64,178,4012 },{ 64,178,4008 },{ 58,146,501 },{ 44,228,496 } },
		{ { 72,178,4012 },{ 72,178,4008 },{ 66,146,501 },{ 52,228,496 } },
		{ { 80,178,4012 },{ 80,178,4008 },{ 74,146,501 },{ 60,228,496 } },
		{ { 89,178,4012 },{ 89,178,4008 },{ 83,146,501 },{ 69,228,496 } },
		{ { 97,178,4012 },{ 97,178,4008 },{ 91,146,501 },{ 77,228,496 } },
		{ { 105,178,4012 },{ 105,178,4008 },{ 99,146,501 },{ 85,228,496 } },
		{ { 113,178,4012 },{ 113,178,4008 },{ 107,146,501 },{ 93,228,496 } },
		{ { 122,178,4012 },{ 122,178,4008 },{ 116,146,501 },{ 102,228,496 } },
		{ { 130,178,4012 },{ 130,178,4008 },{ 124,146,501 },{ 110,228,496 } },
		{ { 138,178,4012 },{ 138,178,4008 },{ 132,146,501 },{ 118,228,496 } },
		{ { 146,178,4012 },{ 146,178,4008 },{ 140,146,501 },{ 126,228,496 } },
		{ { 155,178,4012 },{ 155,178,4008 },{ 149,146,501 },{ 135,228,496 } },
		{ { 163,178,4012 },{ 163,178,4008 },{ 157,146,501 },{ 143,228,496 } },
		{ { 171,178,4012 },{ 171,178,4008 },{ 165,146,501 },{ 151,228,496 } },
		{ { 179,178,4012 },{ 179,178,4008 },{ 173,146,501 },{ 159,228,496 } },
		{ { 188,178,4012 },{ 188,178,4008 },{ 182,146,501 },{ 168,228,496 } },
		{ { 196,178,4012 },{ 196,178,4008 },{ 190,146,501 },{ 176,228,496 } },
		{ { 204,178,4012 },{ 204,178,4008 },{ 198,146,501 },{ 184,228,496 } },
		{ { 212,178,4012 },{ 212,178,4008 },{ 206,146,501 },{ 192,228,496 } },
		{ { 221,178,4012 },{ 221,178,4008 },{ 215,146,501 },{ 201,228,496 } },
		{ { 229,178,4012 },{ 229,178,4008 },{ 223,146,501 },{ 209,228,496 } },
		{ { 235,66,4012 },{ 221,100,4008 },{ 231,146,501 },{ 217,228,496 } },
		{ { 211,102,4085 },{ 118,31,4080 },{ 211,102,501 },{ 118,31,496 } },
		{ { 1,2,3328 },{ 1,2,3328 },{ 0,1,320 },{ 0,1,320 } },
		{ { 7,162,3905 },{ 7,162,3904 },{ 1,17,480 },{ 1,17,480 } },
		{ { 15,162,3906 },{ 15,162,3904 },{ 1,117,352 },{ 1,117,352 } },
		{ { 23,162,3906 },{ 23,162,3904 },{ 5,34,500 },{ 4,53,424 } },
		{ { 32,162,3906 },{ 32,162,3904 },{ 14,34,500 },{ 3,69,424 } },
		{ { 40,162,3906 },{ 40,162,3904 },{ 22,34,500 },{ 1,133,496 } },
		{ { 48,162,3906 },{ 48,162,3904 },{ 30,34,500 },{ 4,85,496 } },
		{ { 56,162,3906 },{ 56,162,3904 },{ 38,34,500 },{ 12,85,496 } },
		{ { 65,162,3906 },{ 65,162,3904 },{ 47,34,500 },{ 1,106,424 } },
		{ { 73,162,3906 },{ 73,162,3904 },{ 55,34,500 },{ 9,106,424 } },
		{ { 81,162,3906 },{ 81,162,3904 },{ 63,34,500 },{ 7,234,496 } },
		{ { 89,162,3906 },{ 89,162,3904 },{ 71,34,500 },{ 15,234,496 } },
		{ { 98,162,3906 },{ 98,162,3904 },{ 80,34,500 },{ 24,234,496 } },
		{ { 106,162,3906 },{ 106,162,3904 },{ 88,34,500 },{ 32,234,496 } },
		{ { 114,162,3906 },{ 114,162,3904 },{ 96,34,500 },{ 40,234,496 } },
		{ { 122,162,3906 },{ 122,162,3904 },{ 104,34,500 },{ 48,234,496 } },
		{ { 131,162,3906 },{ 131,162,3904 },{ 113,34,500 },{ 57,234,496 } },
		{ { 139,162,3906 },{ 139,162,3904 },{ 121,34,500 },{ 65,234,496 } },
		{ { 147,162,3906 },{ 147,162,3904 },{ 129,34,500 },{ 73,234,496 } },
		{ { 155,162,3906 },{ 155,162,3904 },{ 137,34,500 },{ 81,234,496 } },
		{ { 164,162,3906 },{ 164,162,3904 },{ 146,34,500 },{ 90,234,496 } },
		{ { 172,162,3906 },{ 172,162,3904 },{ 154,34,500 },{ 98,234,496 } },
		{ { 180,162,3906 },{ 180,162,3904 },{ 162,34,500 },{ 106,234,496 } },
		{ { 188,162,3906 },{ 188,162,3904 },{ 170,34,500 },{ 114,234,496 } },
		{ { 197,162,3906 },{ 197,162,3904 },{ 179,34,500 },{ 123,234,496 } },
		{ { 205,162,3906 },{ 205,162,3904 },{ 187,34,500 },{ 131,234,496 } },
		{ { 213,162,3906 },{ 213,162,3904 },{ 195,34,500 },{ 139,234,496 } },
		{ { 221,162,3906 },{ 221,162,3904 },{ 203,34,500 },{ 147,234,496 } },
		{ { 230,162,3906 },{ 230,162,3904 },{ 212,34,500 },{ 156,234,496 } },
		{ { 238,162,3906 },{ 174,106,4008 },{ 220,34,500 },{ 164,234,496 } },
		{ { 240,178,4001 },{ 182,106,4008 },{ 228,34,500 },{ 172,234,496 } },
		{ { 166,108,4085 },{ 115,31,4080 },{ 166,108,501 },{ 115,31,496 } },
		{ { 1,68,3328 },{ 1,68,3328 },{ 0,17,384 },{ 0,17,384 } },
		{ { 1,148,3904 },{ 1,148,3904 },{ 1,2,384 },{ 1,2,384 } },
		{ { 21,18,3851 },{ 21,18,3848 },{ 1,50,488 },{ 1,50,488 } },
		{ { 27,195,3851 },{ 29,18,3848 },{ 0,67,488 },{ 0,67,488 } },
		{ { 34,195,3907 },{ 38,18,3848 },{ 20,66,482 },{ 0,3,496 } },
		{ { 42,195,3907 },{ 46,18,3848 },{ 28,66,482 },{ 2,6,424 } },
		{ { 50,195,3907 },{ 54,18,3848 },{ 36,66,482 },{ 4,22,424 } },
		{ { 58,195,3907 },{ 62,18,3848 },{ 44,66,482 },{ 3,73,424 } },
		{ { 67,195,3907 },{ 71,18,3848 },{ 53,66,482 },{ 3,22,496 } },
		{ { 75,195,3907 },{ 79,18,3848 },{ 61,66,482 },{ 2,137,496 } },
		{ { 83,195,3907 },{ 87,18,3848 },{ 69,66,482 },{ 1,89,496 } },
		{ { 91,195,3907 },{ 95,18,3848 },{ 77,66,482 },{ 9,89,496 } },
		{ { 100,195,3907 },{ 104,18,3848 },{ 86,66,482 },{ 18,89,496 } },
		{ { 108,195,3907 },{ 112,18,3848 },{ 94,66,482 },{ 26,89,496 } },
		{ { 116,195,3907 },{ 120,18,3848 },{ 102,66,482 },{ 34,89,496 } },
		{ { 124,195,3907 },{ 128,18,3848 },{ 110,66,482 },{ 42,89,496 } },
		{ { 133,195,3907 },{ 137,18,3848 },{ 119,66,482 },{ 51,89,496 } },
		{ { 141,195,3907 },{ 145,18,3848 },{ 127,66,482 },{ 59,89,496 } },
		{ { 149,195,3907 },{ 153,18,3848 },{ 135,66,482 },{ 67,89,496 } },
		{ { 157,195,3907 },{ 161,18,3848 },{ 143,66,482 },{ 75,89,496 } },
		{ { 166,195,3907 },{ 170,18,3848 },{ 152,66,482 },{ 84,89,496 } },
		{ { 174,195,3907 },{ 178,18,3848 },{ 160,66,482 },{ 92,89,496 } },
		{ { 182,195,3907 },{ 186,18,3848 },{ 168,66,482 },{ 100,89,496 } },
		{ { 190,195,3907 },{ 194,18,3848 },{ 176,66,482 },{ 108,89,496 } },
		{ { 199,195,3907 },{ 203,18,3848 },{ 185,66,482 },{ 117,89,496 } },
		{ { 207,195,3907 },{ 211,18,3848 },{ 193,66,482 },{ 125,89,496 } },
		{ { 215,195,3907 },{ 219,18,3848 },{ 201,66,482 },{ 133,89,496 } },
		{ { 223,195,3907 },{ 227,18,3848 },{ 209,66,482 },{ 141,89,496 } },
		{ { 231,195,3907 },{ 168,89,4008 },{ 218,66,482 },{ 150,89,496 } },
		{ { 236,18,3907 },{ 176,89,4008 },{ 226,66,482 },{ 158,89,496 } },
		{ { 158,90,4085 },{ 103,31,4080 },{ 158,90,501 },{ 103,31,496 } },
		{ { 166,90,4085 },{ 111,31,4080 },{ 166,90,501 },{ 111,31,496 } },
		{ { 0,70,3328 },{ 0,70,3328 },{ 0,45,256 },{ 0,45,256 } },
		{ { 0,117,3904 },{ 0,117,3904 },{ 0,35,384 },{ 0,35,384 } },
		{ { 13,165,3905 },{ 13,165,3904 },{ 3,221,416 },{ 3,221,416 } },
		{ { 21,165,3906 },{ 21,165,3904 },{ 11,221,416 },{ 11,221,416 } },
		{ { 30,165,3906 },{ 30,165,3904 },{ 7,61,352 },{ 7,61,352 } },
		{ { 38,165,3906 },{ 38,165,3904 },{ 2,125,352 },{ 2,125,352 } },
		{ { 46,165,3906 },{ 46,165,3904 },{ 2,37,500 },{ 10,125,352 } },
		{ { 54,165,3906 },{ 54,165,3904 },{ 10,37,500 },{ 5,61,424 } },
		{ { 63,165,3906 },{ 63,165,3904 },{ 19,37,500 },{ 1,189,424 } },
		{ { 4,254,4012 },{ 71,165,3904 },{ 27,37,500 },{ 9,189,424 } },
		{ { 12,254,4012 },{ 79,165,3904 },{ 35,37,500 },{ 4,77,424 } },
		{ { 20,254,4012 },{ 87,165,3904 },{ 43,37,500 },{ 12,77,424 } },
		{ { 29,254,4012 },{ 96,165,3904 },{ 52,37,500 },{ 8,93,424 } },
		{ { 37,254,4012 },{ 104,165,3904 },{ 60,37,500 },{ 3,141,496 } },
		{ { 45,254,4012 },{ 112,165,3904 },{ 68,37,500 },{ 11,141,496 } },
		{ { 53,254,4012 },{ 120,165,3904 },{ 76,37,500 },{ 6,93,496 } },
		{ { 62,254,4012 },{ 129,165,3904 },{ 85,37,500 },{ 15,93,496 } },
		{ { 70,254,4012 },{ 137,165,3904 },{ 93,37,500 },{ 23,93,496 } },
		{ { 78,254,4012 },{ 145,165,3904 },{ 101,37,500 },{ 31,93,496 } },
		{ { 86,254,4012 },{ 153,165,3904 },{ 109,37,500 },{ 39,93,496 } },
		{ { 95,254,4012 },{ 162,165,3904 },{ 118,37,500 },{ 48,93,496 } },
		{ { 103,254,4012 },{ 170,165,3904 },{ 126,37,500 },{ 56,93,496 } },
		{ { 111,254,4012 },{ 178,165,3904 },{ 134,37,500 },{ 64,93,496 } },
		{ { 119,254,4012 },{ 186,165,3904 },{ 142,37,500 },{ 72,93,496 } },
		{ { 128,254,4012 },{ 195,165,3904 },{ 151,37,500 },{ 81,93,496 } },
		{ { 136,254,4012 },{ 203,165,3904 },{ 159,37,500 },{ 89,93,496 } },
		{ { 212,165,3906 },{ 136,77,4008 },{ 167,37,500 },{ 97,93,496 } },
		{ { 220,165,3394 },{ 131,93,4008 },{ 175,37,500 },{ 105,93,496 } },
		{ { 214,181,4001 },{ 140,93,4008 },{ 184,37,500 },{ 114,93,496 } },
		{ { 222,181,4001 },{ 148,93,4008 },{ 192,37,500 },{ 122,93,496 } },
		{ { 114,95,4085 },{ 99,31,4080 },{ 114,95,501 },{ 99,31,496 } },
		{ { 122,95,4085 },{ 107,31,4080 },{ 122,95,501 },{ 107,31,496 } },
		{ { 0,102,3840 },{ 0,102,3840 },{ 0,18,384 },{ 0,18,384 } },
		{ { 5,167,3904 },{ 5,167,3904 },{ 0,13,256 },{ 0,13,256 } },
		{ { 4,54,3968 },{ 4,54,3968 },{ 1,67,448 },{ 1,67,448 } },
		{ { 30,198,3850 },{ 30,198,3848 },{ 0,3,480 },{ 0,3,480 } },
		{ { 39,198,3850 },{ 39,198,3848 },{ 3,52,488 },{ 3,52,488 } },
		{ { 47,198,3851 },{ 47,198,3848 },{ 3,4,488 },{ 3,4,488 } },
		{ { 55,198,3851 },{ 55,198,3848 },{ 1,70,488 },{ 1,70,488 } },
		{ { 54,167,3906 },{ 63,198,3848 },{ 3,22,488 },{ 3,22,488 } },
		{ { 62,167,3906 },{ 72,198,3848 },{ 24,118,488 },{ 0,6,496 } },
		{ { 70,167,3906 },{ 80,198,3848 },{ 32,118,488 },{ 2,89,488 } },
		{ { 78,167,3906 },{ 88,198,3848 },{ 40,118,488 },{ 1,73,496 } },
		{ { 86,167,3906 },{ 96,198,3848 },{ 48,118,488 },{ 0,28,424 } },
		{ { 95,167,3906 },{ 105,198,3848 },{ 57,118,488 },{ 9,28,424 } },
		{ { 103,167,3906 },{ 113,198,3848 },{ 65,118,488 },{ 5,108,496 } },
		{ { 111,167,3906 },{ 121,198,3848 },{ 73,118,488 },{ 13,108,496 } },
		{ { 119,167,3906 },{ 129,198,3848 },{ 81,118,488 },{ 21,108,496 } },
		{ { 128,167,3906 },{ 138,198,3848 },{ 90,118,488 },{ 6,28,496 } },
		{ { 136,167,3906 },{ 146,198,3848 },{ 98,118,488 },{ 14,28,496 } },
		{ { 144,167,3906 },{ 154,198,3848 },{ 106,118,488 },{ 22,28,496 } },
		{ { 152,167,3906 },{ 162,198,3848 },{ 114,118,488 },{ 30,28,496 } },
		{ { 161,167,3906 },{ 171,198,3848 },{ 123,118,488 },{ 39,28,496 } },
		{ { 169,167,3906 },{ 179,198,3848 },{ 131,118,488 },{ 47,28,496 } },
		{ { 177,167,3906 },{ 187,198,3848 },{ 139,118,488 },{ 55,28,496 } },
		{ { 185,167,3906 },{ 195,198,3848 },{ 147,118,488 },{ 63,28,496 } },
		{ { 194,167,3906 },{ 120,12,4008 },{ 156,118,488 },{ 72,28,496 } },
		{ { 206,198,3907 },{ 116,28,4008 },{ 164,118,488 },{ 80,28,496 } },
		{ { 214,198,3907 },{ 124,28,4008 },{ 172,118,488 },{ 88,28,496 } },
		{ { 222,198,3395 },{ 132,28,4008 },{ 180,118,488 },{ 96,28,496 } },
		{ { 207,134,4001 },{ 141,28,4008 },{ 189,118,488 },{ 105,28,496 } },
		{ { 95,30,4085 },{ 86,31,4080 },{ 95,30,501 },{ 86,31,496 } },
		{ { 103,30,4085 },{ 94,31,4080 },{ 103,30,501 },{ 94,31,496 } },
		{ { 111,30,4085 },{ 102,31,4080 },{ 111,30,501 },{ 102,31,496 } },
		{ { 0,104,3840 },{ 0,104,3840 },{ 0,18,448 },{ 0,18,448 } },
		{ { 4,39,3904 },{ 4,39,3904 },{ 0,4,384 },{ 0,4,384 } },
		{ { 0,56,3968 },{ 0,56,3968 },{ 0,84,448 },{ 0,84,448 } },
		{ { 6,110,3328 },{ 6,110,3328 },{ 0,20,448 },{ 0,20,448 } },
		{ { 41,200,3850 },{ 41,200,3848 },{ 1,4,480 },{ 1,4,480 } },
		{ { 49,200,3850 },{ 49,200,3848 },{ 1,8,416 },{ 1,8,416 } },
		{ { 57,200,3851 },{ 57,200,3848 },{ 1,38,488 },{ 1,38,488 } },
		{ { 65,200,3851 },{ 65,200,3848 },{ 1,120,488 },{ 1,120,488 } },
		{ { 74,200,3851 },{ 74,200,3848 },{ 2,72,488 },{ 2,72,488 } },
		{ { 69,6,3907 },{ 82,200,3848 },{ 2,24,488 },{ 2,24,488 } },
		{ { 77,6,3907 },{ 90,200,3848 },{ 26,120,488 },{ 10,24,488 } },
		{ { 97,63,3330 },{ 98,200,3848 },{ 34,120,488 },{ 2,8,496 } },
		{ { 106,63,3330 },{ 107,200,3848 },{ 43,120,488 },{ 3,92,488 } },
		{ { 114,63,3330 },{ 115,200,3848 },{ 51,120,488 },{ 11,92,488 } },
		{ { 122,63,3330 },{ 123,200,3848 },{ 59,120,488 },{ 7,76,496 } },
		{ { 130,63,3330 },{ 131,200,3848 },{ 67,120,488 },{ 15,76,496 } },
		{ { 139,63,3330 },{ 140,200,3848 },{ 76,120,488 },{ 24,76,496 } },
		{ { 147,63,3330 },{ 148,200,3848 },{ 84,120,488 },{ 32,76,496 } },
		{ { 155,63,3330 },{ 156,200,3848 },{ 92,120,488 },{ 40,76,496 } },
		{ { 163,63,3330 },{ 164,200,3848 },{ 100,120,488 },{ 48,76,496 } },
		{ { 172,63,3330 },{ 173,200,3848 },{ 109,120,488 },{ 57,76,496 } },
		{ { 184,6,3851 },{ 181,200,3848 },{ 117,120,488 },{ 65,76,496 } },
		{ { 192,6,3851 },{ 133,28,3936 },{ 125,120,488 },{ 73,76,496 } },
		{ { 189,200,3907 },{ 141,28,3936 },{ 133,120,488 },{ 81,76,496 } },
		{ { 198,200,3907 },{ 138,108,4000 },{ 142,120,488 },{ 90,76,496 } },
		{ { 206,200,3907 },{ 146,108,4000 },{ 150,120,488 },{ 98,76,496 } },
		{ { 214,200,3395 },{ 154,108,4000 },{ 158,120,488 },{ 106,76,496 } },
		{ { 190,136,4001 },{ 162,108,4000 },{ 166,120,488 },{ 114,76,496 } },
		{ { 123,30,4076 },{ 87,15,4080 },{ 123,30,492 },{ 87,15,496 } },
		{ { 117,110,4084 },{ 80,31,4080 },{ 117,110,500 },{ 80,31,496 } },
		{ { 125,110,4084 },{ 88,31,4080 },{ 125,110,500 },{ 88,31,496 } },
		{ { 133,110,4084 },{ 96,31,4080 },{ 133,110,500 },{ 96,31,496 } },
		{ { 9,56,3904 },{ 9,56,3904 },{ 0,67,448 },{ 0,67,448 } },
		{ { 1,8,3904 },{ 1,8,3904 },{ 1,84,448 },{ 1,84,448 } },
		{ { 1,124,3904 },{ 1,124,3904 },{ 0,39,384 },{ 0,39,384 } },
		{ { 9,124,3904 },{ 9,124,3904 },{ 1,4,448 },{ 1,4,448 } },
		{ { 6,76,3904 },{ 6,76,3904 },{ 0,70,448 },{ 0,70,448 } },
		{ { 62,6,3859 },{ 62,6,3856 },{ 2,38,480 },{ 2,38,480 } },
		{ { 70,6,3859 },{ 70,6,3856 },{ 5,43,416 },{ 5,43,416 } },
		{ { 78,6,3859 },{ 78,6,3856 },{ 2,11,416 },{ 2,11,416 } },
		{ { 87,6,3859 },{ 87,6,3856 },{ 0,171,488 },{ 0,171,488 } },
		{ { 67,8,3906 },{ 95,6,3856 },{ 8,171,488 },{ 8,171,488 } },
		{ { 75,8,3907 },{ 103,6,3856 },{ 5,123,488 },{ 5,123,488 } },
		{ { 83,8,3907 },{ 111,6,3856 },{ 2,75,488 },{ 2,75,488 } },
		{ { 92,8,3907 },{ 120,6,3856 },{ 0,27,488 },{ 0,27,488 } },
		{ { 100,8,3907 },{ 128,6,3856 },{ 8,27,488 },{ 8,27,488 } },
		{ { 120,106,3843 },{ 136,6,3856 },{ 100,6,387 },{ 16,27,488 } },
		{ { 128,106,3843 },{ 144,6,3856 },{ 108,6,387 },{ 2,11,496 } },
		{ { 137,106,3843 },{ 153,6,3856 },{ 117,6,387 },{ 11,11,496 } },
		{ { 145,106,3843 },{ 161,6,3856 },{ 125,6,387 },{ 19,11,496 } },
		{ { 163,8,3851 },{ 137,43,3904 },{ 133,6,387 },{ 27,11,496 } },
		{ { 171,8,3851 },{ 101,11,4000 },{ 141,6,387 },{ 35,11,496 } },
		{ { 180,8,3851 },{ 110,11,4000 },{ 150,6,387 },{ 44,11,496 } },
		{ { 188,8,3851 },{ 118,11,4000 },{ 158,6,387 },{ 52,11,496 } },
		{ { 172,72,3907 },{ 126,11,4000 },{ 166,6,387 },{ 60,11,496 } },
		{ { 174,6,3971 },{ 134,11,4000 },{ 174,6,387 },{ 68,11,496 } },
		{ { 183,6,3971 },{ 143,11,4000 },{ 183,6,387 },{ 77,11,496 } },
		{ { 191,6,3971 },{ 151,11,4000 },{ 191,6,387 },{ 85,11,496 } },
		{ { 199,6,3971 },{ 159,11,4000 },{ 199,6,387 },{ 93,11,496 } },
		{ { 92,12,4084 },{ 69,15,4080 },{ 92,12,500 },{ 69,15,496 } },
		{ { 101,12,4084 },{ 78,15,4080 },{ 101,12,500 },{ 78,15,496 } },
		{ { 109,12,4084 },{ 86,15,4080 },{ 109,12,500 },{ 86,15,496 } },
		{ { 117,12,4084 },{ 79,31,4080 },{ 117,12,500 },{ 79,31,496 } },
		{ { 125,12,4084 },{ 87,31,4080 },{ 125,12,500 },{ 87,31,496 } },
		{ { 71,8,3602 },{ 71,8,3600 },{ 2,21,384 },{ 2,21,384 } },
		{ { 79,8,3611 },{ 79,8,3608 },{ 0,69,448 },{ 0,69,448 } },
		{ { 87,8,3611 },{ 87,8,3608 },{ 0,23,384 },{ 0,23,384 } },
		{ { 95,8,3611 },{ 95,8,3608 },{ 1,5,448 },{ 1,5,448 } },
		{ { 104,8,3611 },{ 104,8,3608 },{ 0,88,448 },{ 0,88,448 } },
		{ { 112,8,3611 },{ 112,8,3608 },{ 0,72,448 },{ 0,72,448 } },
		{ { 120,8,3611 },{ 121,8,3608 },{ 36,21,458 },{ 36,21,456 } },
		{ { 133,47,3091 },{ 129,8,3608 },{ 44,21,458 },{ 44,21,456 } },
		{ { 142,47,3091 },{ 138,8,3608 },{ 53,21,459 },{ 53,21,456 } },
		{ { 98,12,3850 },{ 98,12,3848 },{ 61,21,459 },{ 61,21,456 } },
		{ { 106,12,3850 },{ 106,12,3848 },{ 10,92,480 },{ 69,21,456 } },
		{ { 114,12,3851 },{ 114,12,3848 },{ 18,92,480 },{ 77,21,456 } },
		{ { 87,12,3906 },{ 87,12,3904 },{ 3,44,488 },{ 86,21,456 } },
		{ { 95,12,3906 },{ 95,12,3904 },{ 11,44,488 },{ 94,21,456 } },
		{ { 103,12,3906 },{ 103,12,3904 },{ 19,44,488 },{ 102,21,456 } },
		{ { 111,12,3907 },{ 111,12,3904 },{ 27,44,489 },{ 110,21,456 } },
		{ { 120,12,3907 },{ 120,12,3904 },{ 36,44,489 },{ 119,21,456 } },
		{ { 128,12,3907 },{ 128,12,3904 },{ 44,44,489 },{ 127,21,456 } },
		{ { 136,12,3907 },{ 136,12,3904 },{ 52,44,489 },{ 135,21,456 } },
		{ { 144,12,3907 },{ 144,12,3904 },{ 60,44,489 },{ 143,21,456 } },
		{ { 153,12,3907 },{ 153,12,3904 },{ 69,44,490 },{ 152,21,456 } },
		{ { 161,12,3395 },{ 149,188,3968 },{ 77,44,490 },{ 160,21,456 } },
		{ { 169,12,3395 },{ 198,21,3928 },{ 85,44,490 },{ 168,21,456 } },
		{ { 113,95,4001 },{ 201,69,3992 },{ 125,8,483 },{ 176,21,456 } },
		{ { 122,95,4001 },{ 200,21,3984 },{ 134,8,483 },{ 185,21,456 } },
		{ { 142,8,4067 },{ 208,21,3984 },{ 142,8,483 },{ 193,21,456 } },
		{ { 151,8,4067 },{ 47,15,4080 },{ 151,8,483 },{ 47,15,496 } },
		{ { 159,8,4067 },{ 55,15,4080 },{ 159,8,483 },{ 55,15,496 } },
		{ { 168,8,4067 },{ 64,15,4080 },{ 168,8,483 },{ 64,15,496 } },
		{ { 160,40,4075 },{ 72,15,4080 },{ 160,40,491 },{ 72,15,496 } },
		{ { 168,40,4075 },{ 80,15,4080 },{ 168,40,491 },{ 80,15,496 } },
		{ { 144,8,4082 },{ 88,15,4080 },{ 144,8,498 },{ 88,15,496 } }
	};
#endif

#if BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
	static void create_etc2_eac_a8_conversion_table()
	{
		FILE* pFile = fopen("basisu_decoder_tables_etc2_eac_a8.inc", "w");

		for (uint32_t inten = 0; inten < 8; inten++)
		{
			for (uint32_t base = 0; base < 32; base++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(base, base, base, 255), false), inten);

				fprintf(pFile, "{");

				for (uint32_t sel_range = 0; sel_range < NUM_ETC2_EAC_A8_SELECTOR_RANGES; sel_range++)
				{
					const uint32_t low_selector = s_etc2_eac_a8_selector_ranges[sel_range].m_low;
					const uint32_t high_selector = s_etc2_eac_a8_selector_ranges[sel_range].m_high;

					// We have a ETC1 base color and intensity, and a used selector range from low_selector-high_selector.
					// Now find the best ETC2 EAC A8 base/table/multiplier that fits these colors.

					uint8_t pixels[4];
					uint32_t num_pixels = 0;
					for (uint32_t s = low_selector; s <= high_selector; s++)
						pixels[num_pixels++] = block_colors[s].g;

					pack_eac_a8_results pack_results;
					pack_eac_a8_exhaustive(pack_results, pixels, num_pixels);

					etc1_g_to_etc2_a8_conversion& c = s_etc1_g_to_etc2_a8[base + inten * 32][sel_range];

					c.m_base = pack_results.m_base;
					c.m_table_mul = pack_results.m_table * 16 + pack_results.m_multiplier;
					c.m_trans = 0;

					for (uint32_t s = 0; s < 4; s++)
					{
						if ((s < low_selector) || (s > high_selector))
							continue;

						uint32_t etc2_selector = pack_results.m_selectors[s - low_selector];

						c.m_trans |= (etc2_selector << (s * 3));
					}

					fprintf(pFile, "{%u,%u,%u}", c.m_base, c.m_table_mul, c.m_trans);
					if (sel_range < (NUM_ETC2_EAC_A8_SELECTOR_RANGES - 1))
						fprintf(pFile, ",");
				}

				fprintf(pFile, "},\n");
			}
		}

		fclose(pFile);
	}
#endif

#if BASISD_WRITE_NEW_ASTC_TABLES
	static void create_etc1_to_astc_conversion_table_0_47();
	static void create_etc1_to_astc_conversion_table_0_255();
#endif

#if BASISD_SUPPORT_ASTC
	static void transcoder_init_astc();
#endif

#if BASISD_WRITE_NEW_BC7_MODE5_TABLES
	static void create_etc1_to_bc7_m5_color_conversion_table();
	static void create_etc1_to_bc7_m5_alpha_conversion_table();
#endif

#if BASISD_SUPPORT_BC7_MODE5
	static void transcoder_init_bc7_mode5();
#endif

#if BASISD_WRITE_NEW_ATC_TABLES
	static void create_etc1s_to_atc_conversion_tables();
#endif

#if BASISD_SUPPORT_ATC
	static void transcoder_init_atc();
#endif

	// Library global initialization. Requires ~9 milliseconds when compiled and executed natively on a Core i7 2.2 GHz.
	// If this is too slow, these computed tables can easilky be moved to be compiled in.
	void basisu_transcoder_init()
	{
		static bool s_initialized;
		if (s_initialized)
			return;

#if BASISD_SUPPORT_ASTC
		transcoder_init_astc();
#endif
				
#if BASISD_WRITE_NEW_ASTC_TABLES
		create_etc1_to_astc_conversion_table_0_47();
		create_etc1_to_astc_conversion_table_0_255();
		exit(0);
#endif

#if BASISD_WRITE_NEW_BC7_TABLES
		create_etc1_to_bc7_m6_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_BC7_MODE5_TABLES
		create_etc1_to_bc7_m5_color_conversion_table();
		create_etc1_to_bc7_m5_alpha_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_DXT1_TABLES
		create_etc1_to_dxt1_5_conversion_table();
		create_etc1_to_dxt1_6_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_ETC2_EAC_A8_TABLES
		create_etc2_eac_a8_conversion_table();
		exit(0);
#endif

#if BASISD_WRITE_NEW_ATC_TABLES
		create_etc1s_to_atc_conversion_tables();
		exit(0);
#endif

#if BASISD_SUPPORT_DXT1
		uint8_t bc1_expand5[32];
		for (int i = 0; i < 32; i++)
			bc1_expand5[i] = static_cast<uint8_t>((i << 3) | (i >> 2));
		prepare_bc1_single_color_table(g_bc1_match5_equals_1, bc1_expand5, 32, 32, 1);
		prepare_bc1_single_color_table(g_bc1_match5_equals_0, bc1_expand5, 1, 32, 0);

		uint8_t bc1_expand6[64];
		for (int i = 0; i < 64; i++)
			bc1_expand6[i] = static_cast<uint8_t>((i << 2) | (i >> 4));
		prepare_bc1_single_color_table(g_bc1_match6_equals_1, bc1_expand6, 64, 64, 1);
		prepare_bc1_single_color_table(g_bc1_match6_equals_0, bc1_expand6, 1, 64, 0);

		for (uint32_t i = 0; i < NUM_ETC1_TO_DXT1_SELECTOR_RANGES; i++)
		{
			uint32_t l = g_etc1_to_dxt1_selector_ranges[i].m_low;
			uint32_t h = g_etc1_to_dxt1_selector_ranges[i].m_high;
			g_etc1_to_dxt1_selector_range_index[l][h] = i;
		}

		for (uint32_t sm = 0; sm < NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS; sm++)
		{
			uint8_t etc1_to_dxt1_selector_mappings_raw_dxt1[4];
			uint8_t etc1_to_dxt1_selector_mappings_raw_dxt1_inv[4];

			for (uint32_t j = 0; j < 4; j++)
			{
				static const uint8_t s_linear_dxt1_to_dxt1[4] = { 0, 2, 3, 1 };
				static const uint8_t s_dxt1_inverted_xlat[4] = { 1, 0, 3, 2 };

				etc1_to_dxt1_selector_mappings_raw_dxt1[j] = (uint8_t)s_linear_dxt1_to_dxt1[g_etc1_to_dxt1_selector_mappings[sm][j]];
				etc1_to_dxt1_selector_mappings_raw_dxt1_inv[j] = (uint8_t)s_dxt1_inverted_xlat[etc1_to_dxt1_selector_mappings_raw_dxt1[j]];
			}

			for (uint32_t i = 0; i < 256; i++)
			{
				uint32_t k = 0, k_inv = 0;
				for (uint32_t s = 0; s < 4; s++)
				{
					k |= (etc1_to_dxt1_selector_mappings_raw_dxt1[(i >> (s * 2)) & 3] << (s * 2));
					k_inv |= (etc1_to_dxt1_selector_mappings_raw_dxt1_inv[(i >> (s * 2)) & 3] << (s * 2));
				}
				g_etc1_to_dxt1_selector_mappings_raw_dxt1_256[sm][i] = (uint8_t)k;
				g_etc1_to_dxt1_selector_mappings_raw_dxt1_inv_256[sm][i] = (uint8_t)k_inv;
			}
		}
#endif

#if BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
		for (uint32_t i = 0; i < NUM_ETC1_TO_BC7_M6_SELECTOR_RANGES; i++)
		{
			uint32_t l = g_etc1_to_bc7_selector_ranges[i].m_low;
			uint32_t h = g_etc1_to_bc7_selector_ranges[i].m_high;
			g_etc1_to_bc7_m6_selector_range_index[l][h] = i;
		}

		for (uint32_t sm = 0; sm < NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS; sm++)
			for (uint32_t j = 0; j < 4; j++)
				g_etc1_to_bc7_selector_mappings_inv[sm][j] = 15 - g_etc1_to_bc7_selector_mappings[sm][j];
#endif

#if BASISD_SUPPORT_BC7_MODE5
		transcoder_init_bc7_mode5();
#endif

#if BASISD_SUPPORT_ATC
		transcoder_init_atc();
#endif		

		s_initialized = true;
	}

#if BASISD_SUPPORT_DXT1
	static void convert_etc1s_to_dxt1(dxt1_block* pDst_block, const endpoint *pEndpoints, const selector* pSelector, bool use_threecolor_blocks)
	{
#if !BASISD_WRITE_NEW_DXT1_TABLES
		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		const color32& base_color = pEndpoints->m_color5;
		const uint32_t inten_table = pEndpoints->m_inten5;

		if (low_selector == high_selector)
		{
			uint32_t r, g, b;
			decoder_etc_block::get_block_color5(base_color, inten_table, low_selector, r, g, b);

			uint32_t mask = 0xAA;
			uint32_t max16 = (g_bc1_match5_equals_1[r].m_hi << 11) | (g_bc1_match6_equals_1[g].m_hi << 5) | g_bc1_match5_equals_1[b].m_hi;
			uint32_t min16 = (g_bc1_match5_equals_1[r].m_lo << 11) | (g_bc1_match6_equals_1[g].m_lo << 5) | g_bc1_match5_equals_1[b].m_lo;

			if ((!use_threecolor_blocks) && (min16 == max16))
			{
				// This is an annoying edge case that impacts BC3.
				// This is to guarantee that BC3 blocks never use punchthrough alpha (3 color) mode, which isn't supported on some (all?) GPU's.
				mask = 0;

				// Make l > h
				if (min16 > 0)
					min16--;
				else
				{
					// l = h = 0
					assert(min16 == max16 && max16 == 0);

					max16 = 1;
					min16 = 0;
					mask = 0x55;
				}

				assert(max16 > min16);
			}

			if (max16 < min16)
			{
				std::swap(max16, min16);
				mask ^= 0x55;
			}

			pDst_block->set_low_color(static_cast<uint16_t>(max16));
			pDst_block->set_high_color(static_cast<uint16_t>(min16));
			pDst_block->m_selectors[0] = static_cast<uint8_t>(mask);
			pDst_block->m_selectors[1] = static_cast<uint8_t>(mask);
			pDst_block->m_selectors[2] = static_cast<uint8_t>(mask);
			pDst_block->m_selectors[3] = static_cast<uint8_t>(mask);

			return;
		}
		else if ((inten_table >= 7) && (pSelector->m_num_unique_selectors == 2) && (pSelector->m_lo_selector == 0) && (pSelector->m_hi_selector == 3))
		{
			color32 block_colors[4];

			decoder_etc_block::get_block_colors5(block_colors, base_color, inten_table);

			const uint32_t r0 = block_colors[0].r;
			const uint32_t g0 = block_colors[0].g;
			const uint32_t b0 = block_colors[0].b;

			const uint32_t r1 = block_colors[3].r;
			const uint32_t g1 = block_colors[3].g;
			const uint32_t b1 = block_colors[3].b;

			uint32_t max16 = (g_bc1_match5_equals_0[r0].m_hi << 11) | (g_bc1_match6_equals_0[g0].m_hi << 5) | g_bc1_match5_equals_0[b0].m_hi;
			uint32_t min16 = (g_bc1_match5_equals_0[r1].m_hi << 11) | (g_bc1_match6_equals_0[g1].m_hi << 5) | g_bc1_match5_equals_0[b1].m_hi;

			uint32_t l = 0, h = 1;

			if (min16 == max16)
			{
				// Make l > h
				if (min16 > 0)
				{
					min16--;

					l = 0;
					h = 0;
				}
				else
				{
					// l = h = 0
					assert(min16 == max16 && max16 == 0);

					max16 = 1;
					min16 = 0;

					l = 1;
					h = 1;
				}

				assert(max16 > min16);
			}

			if (max16 < min16)
			{
				std::swap(max16, min16);
				l = 1;
				h = 0;
			}

			pDst_block->set_low_color((uint16_t)max16);
			pDst_block->set_high_color((uint16_t)min16);

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					pDst_block->set_selector(x, y, (s == 3) ? h : l);
				}
			}

			return;
		}

		const uint32_t selector_range_table = g_etc1_to_dxt1_selector_range_index[low_selector][high_selector];

		//[32][8][RANGES][MAPPING]
		const etc1_to_dxt1_56_solution* pTable_r = &g_etc1_to_dxt_5[(inten_table * 32 + base_color.r) * (NUM_ETC1_TO_DXT1_SELECTOR_RANGES * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS];
		const etc1_to_dxt1_56_solution* pTable_g = &g_etc1_to_dxt_6[(inten_table * 32 + base_color.g) * (NUM_ETC1_TO_DXT1_SELECTOR_RANGES * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS];
		const etc1_to_dxt1_56_solution* pTable_b = &g_etc1_to_dxt_5[(inten_table * 32 + base_color.b) * (NUM_ETC1_TO_DXT1_SELECTOR_RANGES * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS];

		uint32_t best_err = UINT_MAX;
		uint32_t best_mapping = 0;

		assert(NUM_ETC1_TO_DXT1_SELECTOR_MAPPINGS == 10);
#define DO_ITER(m) { uint32_t total_err = pTable_r[m].m_err + pTable_g[m].m_err + pTable_b[m].m_err; if (total_err < best_err) { best_err = total_err; best_mapping = m; } }
		DO_ITER(0); DO_ITER(1); DO_ITER(2); DO_ITER(3); DO_ITER(4);
		DO_ITER(5); DO_ITER(6); DO_ITER(7); DO_ITER(8); DO_ITER(9);
#undef DO_ITER

		uint32_t l = dxt1_block::pack_unscaled_color(pTable_r[best_mapping].m_lo, pTable_g[best_mapping].m_lo, pTable_b[best_mapping].m_lo);
		uint32_t h = dxt1_block::pack_unscaled_color(pTable_r[best_mapping].m_hi, pTable_g[best_mapping].m_hi, pTable_b[best_mapping].m_hi);

		const uint8_t* pSelectors_xlat_256 = &g_etc1_to_dxt1_selector_mappings_raw_dxt1_256[best_mapping][0];

		if (l < h)
		{
			std::swap(l, h);
			pSelectors_xlat_256 = &g_etc1_to_dxt1_selector_mappings_raw_dxt1_inv_256[best_mapping][0];
		}
				
		pDst_block->set_low_color(static_cast<uint16_t>(l));
		pDst_block->set_high_color(static_cast<uint16_t>(h));

		if (l == h)
		{
			uint8_t mask = 0;

			if (!use_threecolor_blocks)
			{
				// This is an annoying edge case that impacts BC3.

				// Make l > h
				if (h > 0)
					h--;
				else
				{
					// l = h = 0
					assert(l == h && h == 0);

					h = 0;
					l = 1;
					mask = 0x55;
				}

				assert(l > h);
				pDst_block->set_low_color(static_cast<uint16_t>(l));
				pDst_block->set_high_color(static_cast<uint16_t>(h));
			}

			pDst_block->m_selectors[0] = mask;
			pDst_block->m_selectors[1] = mask;
			pDst_block->m_selectors[2] = mask;
			pDst_block->m_selectors[3] = mask;

			return;
		}

		pDst_block->m_selectors[0] = pSelectors_xlat_256[pSelector->m_selectors[0]];
		pDst_block->m_selectors[1] = pSelectors_xlat_256[pSelector->m_selectors[1]];
		pDst_block->m_selectors[2] = pSelectors_xlat_256[pSelector->m_selectors[2]];
		pDst_block->m_selectors[3] = pSelectors_xlat_256[pSelector->m_selectors[3]];
#endif
	}

#if BASISD_ENABLE_DEBUG_FLAGS
	static void convert_etc1s_to_dxt1_vis(dxt1_block* pDst_block, const endpoint* pEndpoints, const selector* pSelector, bool use_threecolor_blocks)
	{
		convert_etc1s_to_dxt1(pDst_block, pEndpoints, pSelector, use_threecolor_blocks);

		if (g_debug_flags & cDebugFlagVisBC1Sels)
		{
			uint32_t l = dxt1_block::pack_unscaled_color(31, 63, 31);
			uint32_t h = dxt1_block::pack_unscaled_color(0, 0, 0);
			pDst_block->set_low_color(static_cast<uint16_t>(l));
			pDst_block->set_high_color(static_cast<uint16_t>(h));
		}
		else if (g_debug_flags & cDebugFlagVisBC1Endpoints)
		{
			for (uint32_t y = 0; y < 4; y++)
				for (uint32_t x = 0; x < 4; x++)
					pDst_block->set_selector(x, y, (y < 2) ? 0 : 1);
		}
	}
#endif
#endif

#if BASISD_SUPPORT_DXT5A
	static dxt_selector_range s_dxt5a_selector_ranges[] =
	{
		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },
	};

	const uint32_t NUM_DXT5A_SELECTOR_RANGES = sizeof(s_dxt5a_selector_ranges) / sizeof(s_dxt5a_selector_ranges[0]);

	struct etc1_g_to_dxt5a_conversion
	{
		uint8_t m_lo, m_hi;
		uint16_t m_trans;
	};

	static etc1_g_to_dxt5a_conversion g_etc1_g_to_dxt5a[32 * 8][NUM_DXT5A_SELECTOR_RANGES] =
	{
		{ { 8, 0, 393 },{ 8, 0, 392 },{ 2, 0, 9 },{ 2, 0, 8 }, }, { { 6, 16, 710 },{ 16, 6, 328 },{ 0, 10, 96 },{ 10, 6, 8 }, },
		{ { 28, 5, 1327 },{ 24, 14, 328 },{ 8, 18, 96 },{ 18, 14, 8 }, }, { { 36, 13, 1327 },{ 32, 22, 328 },{ 16, 26, 96 },{ 26, 22, 8 }, },
		{ { 45, 22, 1327 },{ 41, 31, 328 },{ 25, 35, 96 },{ 35, 31, 8 }, }, { { 53, 30, 1327 },{ 49, 39, 328 },{ 33, 43, 96 },{ 43, 39, 8 }, },
		{ { 61, 38, 1327 },{ 57, 47, 328 },{ 41, 51, 96 },{ 51, 47, 8 }, }, { { 69, 46, 1327 },{ 65, 55, 328 },{ 49, 59, 96 },{ 59, 55, 8 }, },
		{ { 78, 55, 1327 },{ 74, 64, 328 },{ 58, 68, 96 },{ 68, 64, 8 }, }, { { 86, 63, 1327 },{ 82, 72, 328 },{ 66, 76, 96 },{ 76, 72, 8 }, },
		{ { 94, 71, 1327 },{ 90, 80, 328 },{ 74, 84, 96 },{ 84, 80, 8 }, }, { { 102, 79, 1327 },{ 98, 88, 328 },{ 82, 92, 96 },{ 92, 88, 8 }, },
		{ { 111, 88, 1327 },{ 107, 97, 328 },{ 91, 101, 96 },{ 101, 97, 8 }, }, { { 119, 96, 1327 },{ 115, 105, 328 },{ 99, 109, 96 },{ 109, 105, 8 }, },
		{ { 127, 104, 1327 },{ 123, 113, 328 },{ 107, 117, 96 },{ 117, 113, 8 }, }, { { 135, 112, 1327 },{ 131, 121, 328 },{ 115, 125, 96 },{ 125, 121, 8 }, },
		{ { 144, 121, 1327 },{ 140, 130, 328 },{ 124, 134, 96 },{ 134, 130, 8 }, }, { { 152, 129, 1327 },{ 148, 138, 328 },{ 132, 142, 96 },{ 142, 138, 8 }, },
		{ { 160, 137, 1327 },{ 156, 146, 328 },{ 140, 150, 96 },{ 150, 146, 8 }, }, { { 168, 145, 1327 },{ 164, 154, 328 },{ 148, 158, 96 },{ 158, 154, 8 }, },
		{ { 177, 154, 1327 },{ 173, 163, 328 },{ 157, 167, 96 },{ 167, 163, 8 }, }, { { 185, 162, 1327 },{ 181, 171, 328 },{ 165, 175, 96 },{ 175, 171, 8 }, },
		{ { 193, 170, 1327 },{ 189, 179, 328 },{ 173, 183, 96 },{ 183, 179, 8 }, }, { { 201, 178, 1327 },{ 197, 187, 328 },{ 181, 191, 96 },{ 191, 187, 8 }, },
		{ { 210, 187, 1327 },{ 206, 196, 328 },{ 190, 200, 96 },{ 200, 196, 8 }, }, { { 218, 195, 1327 },{ 214, 204, 328 },{ 198, 208, 96 },{ 208, 204, 8 }, },
		{ { 226, 203, 1327 },{ 222, 212, 328 },{ 206, 216, 96 },{ 216, 212, 8 }, }, { { 234, 211, 1327 },{ 230, 220, 328 },{ 214, 224, 96 },{ 224, 220, 8 }, },
		{ { 243, 220, 1327 },{ 239, 229, 328 },{ 223, 233, 96 },{ 233, 229, 8 }, }, { { 251, 228, 1327 },{ 247, 237, 328 },{ 231, 241, 96 },{ 241, 237, 8 }, },
		{ { 239, 249, 3680 },{ 245, 249, 3648 },{ 239, 249, 96 },{ 249, 245, 8 }, }, { { 247, 253, 4040 },{ 255, 253, 8 },{ 247, 253, 456 },{ 255, 253, 8 }, },
		{ { 5, 17, 566 },{ 5, 17, 560 },{ 5, 0, 9 },{ 5, 0, 8 }, }, { { 25, 0, 313 },{ 25, 3, 328 },{ 13, 0, 49 },{ 13, 3, 8 }, },
		{ { 39, 0, 1329 },{ 33, 11, 328 },{ 11, 21, 70 },{ 21, 11, 8 }, }, { { 47, 7, 1329 },{ 41, 19, 328 },{ 29, 7, 33 },{ 29, 19, 8 }, },
		{ { 50, 11, 239 },{ 50, 28, 328 },{ 38, 16, 33 },{ 38, 28, 8 }, }, { { 92, 13, 2423 },{ 58, 36, 328 },{ 46, 24, 33 },{ 46, 36, 8 }, },
		{ { 100, 21, 2423 },{ 66, 44, 328 },{ 54, 32, 33 },{ 54, 44, 8 }, }, { { 86, 7, 1253 },{ 74, 52, 328 },{ 62, 40, 33 },{ 62, 52, 8 }, },
		{ { 95, 16, 1253 },{ 83, 61, 328 },{ 71, 49, 33 },{ 71, 61, 8 }, }, { { 103, 24, 1253 },{ 91, 69, 328 },{ 79, 57, 33 },{ 79, 69, 8 }, },
		{ { 111, 32, 1253 },{ 99, 77, 328 },{ 87, 65, 33 },{ 87, 77, 8 }, }, { { 119, 40, 1253 },{ 107, 85, 328 },{ 95, 73, 33 },{ 95, 85, 8 }, },
		{ { 128, 49, 1253 },{ 116, 94, 328 },{ 104, 82, 33 },{ 104, 94, 8 }, }, { { 136, 57, 1253 },{ 124, 102, 328 },{ 112, 90, 33 },{ 112, 102, 8 }, },
		{ { 144, 65, 1253 },{ 132, 110, 328 },{ 120, 98, 33 },{ 120, 110, 8 }, }, { { 152, 73, 1253 },{ 140, 118, 328 },{ 128, 106, 33 },{ 128, 118, 8 }, },
		{ { 161, 82, 1253 },{ 149, 127, 328 },{ 137, 115, 33 },{ 137, 127, 8 }, }, { { 169, 90, 1253 },{ 157, 135, 328 },{ 145, 123, 33 },{ 145, 135, 8 }, },
		{ { 177, 98, 1253 },{ 165, 143, 328 },{ 153, 131, 33 },{ 153, 143, 8 }, }, { { 185, 106, 1253 },{ 173, 151, 328 },{ 161, 139, 33 },{ 161, 151, 8 }, },
		{ { 194, 115, 1253 },{ 182, 160, 328 },{ 170, 148, 33 },{ 170, 160, 8 }, }, { { 202, 123, 1253 },{ 190, 168, 328 },{ 178, 156, 33 },{ 178, 168, 8 }, },
		{ { 210, 131, 1253 },{ 198, 176, 328 },{ 186, 164, 33 },{ 186, 176, 8 }, }, { { 218, 139, 1253 },{ 206, 184, 328 },{ 194, 172, 33 },{ 194, 184, 8 }, },
		{ { 227, 148, 1253 },{ 215, 193, 328 },{ 203, 181, 33 },{ 203, 193, 8 }, }, { { 235, 156, 1253 },{ 223, 201, 328 },{ 211, 189, 33 },{ 211, 201, 8 }, },
		{ { 243, 164, 1253 },{ 231, 209, 328 },{ 219, 197, 33 },{ 219, 209, 8 }, }, { { 183, 239, 867 },{ 239, 217, 328 },{ 227, 205, 33 },{ 227, 217, 8 }, },
		{ { 254, 214, 1329 },{ 248, 226, 328 },{ 236, 214, 33 },{ 236, 226, 8 }, }, { { 222, 244, 3680 },{ 234, 244, 3648 },{ 244, 222, 33 },{ 244, 234, 8 }, },
		{ { 230, 252, 3680 },{ 242, 252, 3648 },{ 252, 230, 33 },{ 252, 242, 8 }, }, { { 238, 250, 4040 },{ 255, 250, 8 },{ 238, 250, 456 },{ 255, 250, 8 }, },
		{ { 9, 29, 566 },{ 9, 29, 560 },{ 9, 0, 9 },{ 9, 0, 8 }, }, { { 17, 37, 566 },{ 17, 37, 560 },{ 17, 0, 9 },{ 17, 0, 8 }, },
		{ { 45, 0, 313 },{ 45, 0, 312 },{ 25, 0, 49 },{ 25, 7, 8 }, }, { { 14, 63, 2758 },{ 5, 53, 784 },{ 15, 33, 70 },{ 33, 15, 8 }, },
		{ { 71, 6, 1329 },{ 72, 4, 1328 },{ 42, 4, 33 },{ 42, 24, 8 }, }, { { 70, 3, 239 },{ 70, 2, 232 },{ 50, 12, 33 },{ 50, 32, 8 }, },
		{ { 0, 98, 2842 },{ 78, 10, 232 },{ 58, 20, 33 },{ 58, 40, 8 }, }, { { 97, 27, 1329 },{ 86, 18, 232 },{ 66, 28, 33 },{ 66, 48, 8 }, },
		{ { 0, 94, 867 },{ 95, 27, 232 },{ 75, 37, 33 },{ 75, 57, 8 }, }, { { 8, 102, 867 },{ 103, 35, 232 },{ 83, 45, 33 },{ 83, 65, 8 }, },
		{ { 12, 112, 867 },{ 111, 43, 232 },{ 91, 53, 33 },{ 91, 73, 8 }, }, { { 139, 2, 1253 },{ 119, 51, 232 },{ 99, 61, 33 },{ 99, 81, 8 }, },
		{ { 148, 13, 1253 },{ 128, 60, 232 },{ 108, 70, 33 },{ 108, 90, 8 }, }, { { 156, 21, 1253 },{ 136, 68, 232 },{ 116, 78, 33 },{ 116, 98, 8 }, },
		{ { 164, 29, 1253 },{ 144, 76, 232 },{ 124, 86, 33 },{ 124, 106, 8 }, }, { { 172, 37, 1253 },{ 152, 84, 232 },{ 132, 94, 33 },{ 132, 114, 8 }, },
		{ { 181, 46, 1253 },{ 161, 93, 232 },{ 141, 103, 33 },{ 141, 123, 8 }, }, { { 189, 54, 1253 },{ 169, 101, 232 },{ 149, 111, 33 },{ 149, 131, 8 }, },
		{ { 197, 62, 1253 },{ 177, 109, 232 },{ 157, 119, 33 },{ 157, 139, 8 }, }, { { 205, 70, 1253 },{ 185, 117, 232 },{ 165, 127, 33 },{ 165, 147, 8 }, },
		{ { 214, 79, 1253 },{ 194, 126, 232 },{ 174, 136, 33 },{ 174, 156, 8 }, }, { { 222, 87, 1253 },{ 202, 134, 232 },{ 182, 144, 33 },{ 182, 164, 8 }, },
		{ { 230, 95, 1253 },{ 210, 142, 232 },{ 190, 152, 33 },{ 190, 172, 8 }, }, { { 238, 103, 1253 },{ 218, 150, 232 },{ 198, 160, 33 },{ 198, 180, 8 }, },
		{ { 247, 112, 1253 },{ 227, 159, 232 },{ 207, 169, 33 },{ 207, 189, 8 }, }, { { 255, 120, 1253 },{ 235, 167, 232 },{ 215, 177, 33 },{ 215, 197, 8 }, },
		{ { 146, 243, 867 },{ 243, 175, 232 },{ 223, 185, 33 },{ 223, 205, 8 }, }, { { 184, 231, 3682 },{ 203, 251, 784 },{ 231, 193, 33 },{ 231, 213, 8 }, },
		{ { 193, 240, 3682 },{ 222, 240, 3648 },{ 240, 202, 33 },{ 240, 222, 8 }, }, { { 255, 210, 169 },{ 230, 248, 3648 },{ 248, 210, 33 },{ 248, 230, 8 }, },
		{ { 218, 238, 4040 },{ 255, 238, 8 },{ 218, 238, 456 },{ 255, 238, 8 }, }, { { 226, 246, 4040 },{ 255, 246, 8 },{ 226, 246, 456 },{ 255, 246, 8 }, },
		{ { 13, 42, 566 },{ 13, 42, 560 },{ 13, 0, 9 },{ 13, 0, 8 }, }, { { 50, 0, 329 },{ 50, 0, 328 },{ 21, 0, 9 },{ 21, 0, 8 }, },
		{ { 29, 58, 566 },{ 67, 2, 1352 },{ 3, 29, 70 },{ 29, 3, 8 }, }, { { 10, 79, 2758 },{ 76, 11, 1352 },{ 11, 37, 70 },{ 37, 11, 8 }, },
		{ { 7, 75, 790 },{ 7, 75, 784 },{ 20, 46, 70 },{ 46, 20, 8 }, }, { { 15, 83, 790 },{ 97, 1, 1328 },{ 28, 54, 70 },{ 54, 28, 8 }, },
		{ { 101, 7, 1329 },{ 105, 9, 1328 },{ 62, 0, 39 },{ 62, 36, 8 }, }, { { 99, 1, 239 },{ 99, 3, 232 },{ 1, 71, 98 },{ 70, 44, 8 }, },
		{ { 107, 11, 239 },{ 108, 12, 232 },{ 10, 80, 98 },{ 79, 53, 8 }, }, { { 115, 19, 239 },{ 116, 20, 232 },{ 18, 88, 98 },{ 87, 61, 8 }, },
		{ { 123, 27, 239 },{ 124, 28, 232 },{ 26, 96, 98 },{ 95, 69, 8 }, }, { { 131, 35, 239 },{ 132, 36, 232 },{ 34, 104, 98 },{ 103, 77, 8 }, },
		{ { 140, 44, 239 },{ 141, 45, 232 },{ 43, 113, 98 },{ 112, 86, 8 }, }, { { 148, 52, 239 },{ 149, 53, 232 },{ 51, 121, 98 },{ 120, 94, 8 }, },
		{ { 156, 60, 239 },{ 157, 61, 232 },{ 59, 129, 98 },{ 128, 102, 8 }, }, { { 164, 68, 239 },{ 165, 69, 232 },{ 67, 137, 98 },{ 136, 110, 8 }, },
		{ { 173, 77, 239 },{ 174, 78, 232 },{ 76, 146, 98 },{ 145, 119, 8 }, }, { { 181, 85, 239 },{ 182, 86, 232 },{ 84, 154, 98 },{ 153, 127, 8 }, },
		{ { 189, 93, 239 },{ 190, 94, 232 },{ 92, 162, 98 },{ 161, 135, 8 }, }, { { 197, 101, 239 },{ 198, 102, 232 },{ 100, 170, 98 },{ 169, 143, 8 }, },
		{ { 206, 110, 239 },{ 207, 111, 232 },{ 109, 179, 98 },{ 178, 152, 8 }, }, { { 214, 118, 239 },{ 215, 119, 232 },{ 117, 187, 98 },{ 186, 160, 8 }, },
		{ { 222, 126, 239 },{ 223, 127, 232 },{ 125, 195, 98 },{ 194, 168, 8 }, }, { { 230, 134, 239 },{ 231, 135, 232 },{ 133, 203, 98 },{ 202, 176, 8 }, },
		{ { 239, 143, 239 },{ 240, 144, 232 },{ 142, 212, 98 },{ 211, 185, 8 }, }, { { 247, 151, 239 },{ 180, 248, 784 },{ 150, 220, 98 },{ 219, 193, 8 }, },
		{ { 159, 228, 3682 },{ 201, 227, 3648 },{ 158, 228, 98 },{ 227, 201, 8 }, }, { { 181, 249, 3928 },{ 209, 235, 3648 },{ 166, 236, 98 },{ 235, 209, 8 }, },
		{ { 255, 189, 169 },{ 218, 244, 3648 },{ 175, 245, 98 },{ 244, 218, 8 }, }, { { 197, 226, 4040 },{ 226, 252, 3648 },{ 183, 253, 98 },{ 252, 226, 8 }, },
		{ { 205, 234, 4040 },{ 255, 234, 8 },{ 205, 234, 456 },{ 255, 234, 8 }, }, { { 213, 242, 4040 },{ 255, 242, 8 },{ 213, 242, 456 },{ 255, 242, 8 }, },
		{ { 18, 60, 566 },{ 18, 60, 560 },{ 18, 0, 9 },{ 18, 0, 8 }, }, { { 26, 68, 566 },{ 26, 68, 560 },{ 26, 0, 9 },{ 26, 0, 8 }, },
		{ { 34, 76, 566 },{ 34, 76, 560 },{ 34, 0, 9 },{ 34, 0, 8 }, }, { { 5, 104, 2758 },{ 98, 5, 1352 },{ 42, 0, 57 },{ 42, 6, 8 }, },
		{ { 92, 0, 313 },{ 93, 1, 312 },{ 15, 51, 70 },{ 51, 15, 8 }, }, { { 3, 101, 790 },{ 3, 101, 784 },{ 0, 59, 88 },{ 59, 23, 8 }, },
		{ { 14, 107, 790 },{ 11, 109, 784 },{ 31, 67, 70 },{ 67, 31, 8 }, }, { { 19, 117, 790 },{ 19, 117, 784 },{ 39, 75, 70 },{ 75, 39, 8 }, },
		{ { 28, 126, 790 },{ 28, 126, 784 },{ 83, 5, 33 },{ 84, 48, 8 }, }, { { 132, 0, 239 },{ 36, 134, 784 },{ 91, 13, 33 },{ 92, 56, 8 }, },
		{ { 142, 4, 239 },{ 44, 142, 784 },{ 99, 21, 33 },{ 100, 64, 8 }, }, { { 150, 12, 239 },{ 52, 150, 784 },{ 107, 29, 33 },{ 108, 72, 8 }, },
		{ { 159, 21, 239 },{ 61, 159, 784 },{ 116, 38, 33 },{ 117, 81, 8 }, }, { { 167, 29, 239 },{ 69, 167, 784 },{ 124, 46, 33 },{ 125, 89, 8 }, },
		{ { 175, 37, 239 },{ 77, 175, 784 },{ 132, 54, 33 },{ 133, 97, 8 }, }, { { 183, 45, 239 },{ 85, 183, 784 },{ 140, 62, 33 },{ 141, 105, 8 }, },
		{ { 192, 54, 239 },{ 94, 192, 784 },{ 149, 71, 33 },{ 150, 114, 8 }, }, { { 200, 62, 239 },{ 102, 200, 784 },{ 157, 79, 33 },{ 158, 122, 8 }, },
		{ { 208, 70, 239 },{ 110, 208, 784 },{ 165, 87, 33 },{ 166, 130, 8 }, }, { { 216, 78, 239 },{ 118, 216, 784 },{ 173, 95, 33 },{ 174, 138, 8 }, },
		{ { 225, 87, 239 },{ 127, 225, 784 },{ 182, 104, 33 },{ 183, 147, 8 }, }, { { 233, 95, 239 },{ 135, 233, 784 },{ 190, 112, 33 },{ 191, 155, 8 }, },
		{ { 241, 103, 239 },{ 143, 241, 784 },{ 198, 120, 33 },{ 199, 163, 8 }, }, { { 111, 208, 3682 },{ 151, 249, 784 },{ 206, 128, 33 },{ 207, 171, 8 }, },
		{ { 120, 217, 3682 },{ 180, 216, 3648 },{ 215, 137, 33 },{ 216, 180, 8 }, }, { { 128, 225, 3682 },{ 188, 224, 3648 },{ 223, 145, 33 },{ 224, 188, 8 }, },
		{ { 155, 253, 3928 },{ 196, 232, 3648 },{ 231, 153, 33 },{ 232, 196, 8 }, }, { { 144, 241, 3682 },{ 204, 240, 3648 },{ 239, 161, 33 },{ 240, 204, 8 }, },
		{ { 153, 250, 3682 },{ 213, 249, 3648 },{ 248, 170, 33 },{ 249, 213, 8 }, }, { { 179, 221, 4040 },{ 255, 221, 8 },{ 179, 221, 456 },{ 255, 221, 8 }, },
		{ { 187, 229, 4040 },{ 255, 229, 8 },{ 187, 229, 456 },{ 255, 229, 8 }, }, { { 195, 237, 4040 },{ 255, 237, 8 },{ 195, 237, 456 },{ 255, 237, 8 }, },
		{ { 24, 80, 566 },{ 24, 80, 560 },{ 24, 0, 9 },{ 24, 0, 8 }, }, { { 32, 88, 566 },{ 32, 88, 560 },{ 32, 0, 9 },{ 32, 0, 8 }, },
		{ { 40, 96, 566 },{ 40, 96, 560 },{ 40, 0, 9 },{ 40, 0, 8 }, }, { { 48, 104, 566 },{ 48, 104, 560 },{ 48, 0, 9 },{ 48, 0, 8 }, },
		{ { 9, 138, 2758 },{ 130, 7, 1352 },{ 9, 57, 70 },{ 57, 9, 8 }, }, { { 119, 0, 313 },{ 120, 0, 312 },{ 17, 65, 70 },{ 65, 17, 8 }, },
		{ { 0, 128, 784 },{ 128, 6, 312 },{ 25, 73, 70 },{ 73, 25, 8 }, }, { { 6, 137, 790 },{ 5, 136, 784 },{ 33, 81, 70 },{ 81, 33, 8 }, },
		{ { 42, 171, 2758 },{ 14, 145, 784 },{ 42, 90, 70 },{ 90, 42, 8 }, }, { { 50, 179, 2758 },{ 22, 153, 784 },{ 50, 98, 70 },{ 98, 50, 8 }, },
		{ { 58, 187, 2758 },{ 30, 161, 784 },{ 58, 106, 70 },{ 106, 58, 8 }, }, { { 191, 18, 1329 },{ 38, 169, 784 },{ 112, 9, 33 },{ 114, 66, 8 }, },
		{ { 176, 0, 239 },{ 47, 178, 784 },{ 121, 18, 33 },{ 123, 75, 8 }, }, { { 187, 1, 239 },{ 55, 186, 784 },{ 129, 26, 33 },{ 131, 83, 8 }, },
		{ { 195, 10, 239 },{ 63, 194, 784 },{ 137, 34, 33 },{ 139, 91, 8 }, }, { { 203, 18, 239 },{ 71, 202, 784 },{ 145, 42, 33 },{ 147, 99, 8 }, },
		{ { 212, 27, 239 },{ 80, 211, 784 },{ 154, 51, 33 },{ 156, 108, 8 }, }, { { 220, 35, 239 },{ 88, 219, 784 },{ 162, 59, 33 },{ 164, 116, 8 }, },
		{ { 228, 43, 239 },{ 96, 227, 784 },{ 170, 67, 33 },{ 172, 124, 8 }, }, { { 236, 51, 239 },{ 104, 235, 784 },{ 178, 75, 33 },{ 180, 132, 8 }, },
		{ { 245, 60, 239 },{ 113, 244, 784 },{ 187, 84, 33 },{ 189, 141, 8 }, }, { { 91, 194, 3680 },{ 149, 197, 3648 },{ 195, 92, 33 },{ 197, 149, 8 }, },
		{ { 99, 202, 3680 },{ 157, 205, 3648 },{ 203, 100, 33 },{ 205, 157, 8 }, }, { { 107, 210, 3680 },{ 165, 213, 3648 },{ 211, 108, 33 },{ 213, 165, 8 }, },
		{ { 119, 249, 3928 },{ 174, 222, 3648 },{ 220, 117, 33 },{ 222, 174, 8 }, }, { { 127, 255, 856 },{ 182, 230, 3648 },{ 228, 125, 33 },{ 230, 182, 8 }, },
		{ { 255, 135, 169 },{ 190, 238, 3648 },{ 236, 133, 33 },{ 238, 190, 8 }, }, { { 140, 243, 3680 },{ 198, 246, 3648 },{ 244, 141, 33 },{ 246, 198, 8 }, },
		{ { 151, 207, 4040 },{ 255, 207, 8 },{ 151, 207, 456 },{ 255, 207, 8 }, }, { { 159, 215, 4040 },{ 255, 215, 8 },{ 159, 215, 456 },{ 255, 215, 8 }, },
		{ { 167, 223, 4040 },{ 255, 223, 8 },{ 167, 223, 456 },{ 255, 223, 8 }, }, { { 175, 231, 4040 },{ 255, 231, 8 },{ 175, 231, 456 },{ 255, 231, 8 }, },
		{ { 33, 106, 566 },{ 33, 106, 560 },{ 33, 0, 9 },{ 33, 0, 8 }, }, { { 41, 114, 566 },{ 41, 114, 560 },{ 41, 0, 9 },{ 41, 0, 8 }, },
		{ { 49, 122, 566 },{ 49, 122, 560 },{ 49, 0, 9 },{ 49, 0, 8 }, }, { { 57, 130, 566 },{ 57, 130, 560 },{ 57, 0, 9 },{ 57, 0, 8 }, },
		{ { 66, 139, 566 },{ 66, 139, 560 },{ 66, 0, 9 },{ 66, 0, 8 }, }, { { 74, 147, 566 },{ 170, 7, 1352 },{ 8, 74, 70 },{ 74, 8, 8 }, },
		{ { 152, 0, 313 },{ 178, 15, 1352 },{ 0, 82, 80 },{ 82, 16, 8 }, }, { { 162, 0, 313 },{ 186, 23, 1352 },{ 24, 90, 70 },{ 90, 24, 8 }, },
		{ { 0, 171, 784 },{ 195, 32, 1352 },{ 33, 99, 70 },{ 99, 33, 8 }, }, { { 6, 179, 790 },{ 203, 40, 1352 },{ 41, 107, 70 },{ 107, 41, 8 }, },
		{ { 15, 187, 790 },{ 211, 48, 1352 },{ 115, 0, 41 },{ 115, 49, 8 }, }, { { 61, 199, 710 },{ 219, 56, 1352 },{ 57, 123, 70 },{ 123, 57, 8 }, },
		{ { 70, 208, 710 },{ 228, 65, 1352 },{ 66, 132, 70 },{ 132, 66, 8 }, }, { { 78, 216, 710 },{ 236, 73, 1352 },{ 74, 140, 70 },{ 140, 74, 8 }, },
		{ { 86, 224, 710 },{ 244, 81, 1352 },{ 145, 7, 33 },{ 148, 82, 8 }, }, { { 222, 8, 233 },{ 252, 89, 1352 },{ 153, 15, 33 },{ 156, 90, 8 }, },
		{ { 235, 0, 239 },{ 241, 101, 328 },{ 166, 6, 39 },{ 165, 99, 8 }, }, { { 32, 170, 3680 },{ 249, 109, 328 },{ 0, 175, 98 },{ 173, 107, 8 }, },
		{ { 40, 178, 3680 },{ 115, 181, 3648 },{ 8, 183, 98 },{ 181, 115, 8 }, }, { { 48, 186, 3680 },{ 123, 189, 3648 },{ 16, 191, 98 },{ 189, 123, 8 }, },
		{ { 57, 195, 3680 },{ 132, 198, 3648 },{ 25, 200, 98 },{ 198, 132, 8 }, }, { { 67, 243, 3928 },{ 140, 206, 3648 },{ 33, 208, 98 },{ 206, 140, 8 }, },
		{ { 76, 251, 3928 },{ 148, 214, 3648 },{ 41, 216, 98 },{ 214, 148, 8 }, }, { { 86, 255, 856 },{ 156, 222, 3648 },{ 49, 224, 98 },{ 222, 156, 8 }, },
		{ { 255, 93, 169 },{ 165, 231, 3648 },{ 58, 233, 98 },{ 231, 165, 8 }, }, { { 98, 236, 3680 },{ 173, 239, 3648 },{ 66, 241, 98 },{ 239, 173, 8 }, },
		{ { 108, 181, 4040 },{ 181, 247, 3648 },{ 74, 249, 98 },{ 247, 181, 8 }, }, { { 116, 189, 4040 },{ 255, 189, 8 },{ 116, 189, 456 },{ 255, 189, 8 }, },
		{ { 125, 198, 4040 },{ 255, 198, 8 },{ 125, 198, 456 },{ 255, 198, 8 }, }, { { 133, 206, 4040 },{ 255, 206, 8 },{ 133, 206, 456 },{ 255, 206, 8 }, },
		{ { 141, 214, 4040 },{ 255, 214, 8 },{ 141, 214, 456 },{ 255, 214, 8 }, }, { { 149, 222, 4040 },{ 255, 222, 8 },{ 149, 222, 456 },{ 255, 222, 8 }, },
		{ { 47, 183, 566 },{ 47, 183, 560 },{ 47, 0, 9 },{ 47, 0, 8 }, }, { { 55, 191, 566 },{ 55, 191, 560 },{ 55, 0, 9 },{ 55, 0, 8 }, },
		{ { 63, 199, 566 },{ 63, 199, 560 },{ 63, 0, 9 },{ 63, 0, 8 }, }, { { 71, 207, 566 },{ 71, 207, 560 },{ 71, 0, 9 },{ 71, 0, 8 }, },
		{ { 80, 216, 566 },{ 80, 216, 560 },{ 80, 0, 9 },{ 80, 0, 8 }, }, { { 88, 224, 566 },{ 88, 224, 560 },{ 88, 0, 9 },{ 88, 0, 8 }, },
		{ { 3, 233, 710 },{ 3, 233, 704 },{ 2, 96, 70 },{ 96, 2, 8 }, }, { { 11, 241, 710 },{ 11, 241, 704 },{ 10, 104, 70 },{ 104, 10, 8 }, },
		{ { 20, 250, 710 },{ 20, 250, 704 },{ 19, 113, 70 },{ 113, 19, 8 }, }, { { 27, 121, 3654 },{ 27, 121, 3648 },{ 27, 121, 70 },{ 121, 27, 8 }, },
		{ { 35, 129, 3654 },{ 35, 129, 3648 },{ 35, 129, 70 },{ 129, 35, 8 }, }, { { 43, 137, 3654 },{ 43, 137, 3648 },{ 43, 137, 70 },{ 137, 43, 8 }, },
		{ { 52, 146, 3654 },{ 52, 146, 3648 },{ 52, 146, 70 },{ 146, 52, 8 }, }, { { 60, 154, 3654 },{ 60, 154, 3648 },{ 60, 154, 70 },{ 154, 60, 8 }, },
		{ { 68, 162, 3654 },{ 68, 162, 3648 },{ 68, 162, 70 },{ 162, 68, 8 }, }, { { 76, 170, 3654 },{ 76, 170, 3648 },{ 76, 170, 70 },{ 170, 76, 8 }, },
		{ { 85, 179, 3654 },{ 85, 179, 3648 },{ 85, 179, 70 },{ 179, 85, 8 }, }, { { 93, 187, 3654 },{ 93, 187, 3648 },{ 93, 187, 70 },{ 187, 93, 8 }, },
		{ { 101, 195, 3654 },{ 101, 195, 3648 },{ 101, 195, 70 },{ 195, 101, 8 }, }, { { 109, 203, 3654 },{ 109, 203, 3648 },{ 109, 203, 70 },{ 203, 109, 8 }, },
		{ { 118, 212, 3654 },{ 118, 212, 3648 },{ 118, 212, 70 },{ 212, 118, 8 }, }, { { 126, 220, 3654 },{ 126, 220, 3648 },{ 126, 220, 70 },{ 220, 126, 8 }, },
		{ { 134, 228, 3654 },{ 134, 228, 3648 },{ 134, 228, 70 },{ 228, 134, 8 }, }, { { 5, 236, 3680 },{ 142, 236, 3648 },{ 5, 236, 96 },{ 236, 142, 8 }, },
		{ { 14, 245, 3680 },{ 151, 245, 3648 },{ 14, 245, 96 },{ 245, 151, 8 }, }, { { 23, 159, 4040 },{ 159, 253, 3648 },{ 23, 159, 456 },{ 253, 159, 8 }, },
		{ { 31, 167, 4040 },{ 255, 167, 8 },{ 31, 167, 456 },{ 255, 167, 8 }, }, { { 39, 175, 4040 },{ 255, 175, 8 },{ 39, 175, 456 },{ 255, 175, 8 }, },
		{ { 48, 184, 4040 },{ 255, 184, 8 },{ 48, 184, 456 },{ 255, 184, 8 }, }, { { 56, 192, 4040 },{ 255, 192, 8 },{ 56, 192, 456 },{ 255, 192, 8 }, },
		{ { 64, 200, 4040 },{ 255, 200, 8 },{ 64, 200, 456 },{ 255, 200, 8 }, },{ { 72, 208, 4040 },{ 255, 208, 8 },{ 72, 208, 456 },{ 255, 208, 8 }, },

	};

	struct dxt5a_block
	{
		uint8_t m_endpoints[2];

		enum { cTotalSelectorBytes = 6 };
		uint8_t m_selectors[cTotalSelectorBytes];

		inline void clear()
		{
			basisu::clear_obj(*this);
		}

		inline uint32_t get_low_alpha() const
		{
			return m_endpoints[0];
		}

		inline uint32_t get_high_alpha() const
		{
			return m_endpoints[1];
		}

		inline void set_low_alpha(uint32_t i)
		{
			assert(i <= UINT8_MAX);
			m_endpoints[0] = static_cast<uint8_t>(i);
		}

		inline void set_high_alpha(uint32_t i)
		{
			assert(i <= UINT8_MAX);
			m_endpoints[1] = static_cast<uint8_t>(i);
		}

		inline bool is_alpha6_block() const { return get_low_alpha() <= get_high_alpha(); }

		uint32_t get_endpoints_as_word() const { return m_endpoints[0] | (m_endpoints[1] << 8); }
		uint32_t get_selectors_as_word(uint32_t index) { assert(index < 3); return m_selectors[index * 2] | (m_selectors[index * 2 + 1] << 8); }

		inline uint32_t get_selector(uint32_t x, uint32_t y) const
		{
			assert((x < 4U) && (y < 4U));

			uint32_t selector_index = (y * 4) + x;
			uint32_t bit_index = selector_index * cDXT5SelectorBits;

			uint32_t byte_index = bit_index >> 3;
			uint32_t bit_ofs = bit_index & 7;

			uint32_t v = m_selectors[byte_index];
			if (byte_index < (cTotalSelectorBytes - 1))
				v |= (m_selectors[byte_index + 1] << 8);

			return (v >> bit_ofs) & 7;
		}

		inline void set_selector(uint32_t x, uint32_t y, uint32_t val)
		{
			assert((x < 4U) && (y < 4U) && (val < 8U));

			uint32_t selector_index = (y * 4) + x;
			uint32_t bit_index = selector_index * cDXT5SelectorBits;

			uint32_t byte_index = bit_index >> 3;
			uint32_t bit_ofs = bit_index & 7;

			uint32_t v = m_selectors[byte_index];
			if (byte_index < (cTotalSelectorBytes - 1))
				v |= (m_selectors[byte_index + 1] << 8);

			v &= (~(7 << bit_ofs));
			v |= (val << bit_ofs);

			m_selectors[byte_index] = static_cast<uint8_t>(v);
			if (byte_index < (cTotalSelectorBytes - 1))
				m_selectors[byte_index + 1] = static_cast<uint8_t>(v >> 8);
		}

		enum { cMaxSelectorValues = 8 };

		static uint32_t get_block_values6(color32* pDst, uint32_t l, uint32_t h)
		{
			pDst[0].a = static_cast<uint8_t>(l);
			pDst[1].a = static_cast<uint8_t>(h);
			pDst[2].a = static_cast<uint8_t>((l * 4 + h) / 5);
			pDst[3].a = static_cast<uint8_t>((l * 3 + h * 2) / 5);
			pDst[4].a = static_cast<uint8_t>((l * 2 + h * 3) / 5);
			pDst[5].a = static_cast<uint8_t>((l + h * 4) / 5);
			pDst[6].a = 0;
			pDst[7].a = 255;
			return 6;
		}

		static uint32_t get_block_values8(color32* pDst, uint32_t l, uint32_t h)
		{
			pDst[0].a = static_cast<uint8_t>(l);
			pDst[1].a = static_cast<uint8_t>(h);
			pDst[2].a = static_cast<uint8_t>((l * 6 + h) / 7);
			pDst[3].a = static_cast<uint8_t>((l * 5 + h * 2) / 7);
			pDst[4].a = static_cast<uint8_t>((l * 4 + h * 3) / 7);
			pDst[5].a = static_cast<uint8_t>((l * 3 + h * 4) / 7);
			pDst[6].a = static_cast<uint8_t>((l * 2 + h * 5) / 7);
			pDst[7].a = static_cast<uint8_t>((l + h * 6) / 7);
			return 8;
		}

		static uint32_t get_block_values(color32* pDst, uint32_t l, uint32_t h)
		{
			if (l > h)
				return get_block_values8(pDst, l, h);
			else
				return get_block_values6(pDst, l, h);
		}
	};

	static void convert_etc1s_to_dxt5a(dxt5a_block* pDst_block, const endpoint* pEndpoints, const selector* pSelector)
	{
		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		const color32& base_color = pEndpoints->m_color5;
		const uint32_t inten_table = pEndpoints->m_inten5;

		if (low_selector == high_selector)
		{
			uint32_t r;
			decoder_etc_block::get_block_color5_r(base_color, inten_table, low_selector, r);
						
			pDst_block->set_low_alpha(r);
			pDst_block->set_high_alpha(r);
			pDst_block->m_selectors[0] = 0;
			pDst_block->m_selectors[1] = 0;
			pDst_block->m_selectors[2] = 0;
			pDst_block->m_selectors[3] = 0;
			pDst_block->m_selectors[4] = 0;
			pDst_block->m_selectors[5] = 0;
			return;
		}
		else if (pSelector->m_num_unique_selectors == 2)
		{
			color32 block_colors[4];

			decoder_etc_block::get_block_colors5(block_colors, base_color, inten_table);

			const uint32_t r0 = block_colors[low_selector].r;
			const uint32_t r1 = block_colors[high_selector].r;

			pDst_block->set_low_alpha(r0);
			pDst_block->set_high_alpha(r1);

			// TODO: Optimize this
			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					pDst_block->set_selector(x, y, (s == high_selector) ? 1 : 0);
				}
			}

			return;
		}

		uint32_t selector_range_table = 0;
		for (selector_range_table = 0; selector_range_table < NUM_DXT5A_SELECTOR_RANGES; selector_range_table++)
			if ((low_selector == s_dxt5a_selector_ranges[selector_range_table].m_low) && (high_selector == s_dxt5a_selector_ranges[selector_range_table].m_high))
				break;
		if (selector_range_table >= NUM_DXT5A_SELECTOR_RANGES)
			selector_range_table = 0;

		const etc1_g_to_dxt5a_conversion* pTable_entry = &g_etc1_g_to_dxt5a[base_color.r + inten_table * 32][selector_range_table];

		pDst_block->set_low_alpha(pTable_entry->m_lo);
		pDst_block->set_high_alpha(pTable_entry->m_hi);

		// TODO: Optimize this (like ETC1->BC1)
		for (uint32_t y = 0; y < 4; y++)
		{
			for (uint32_t x = 0; x < 4; x++)
			{
				uint32_t s = pSelector->get_selector(x, y);

				uint32_t ds = (pTable_entry->m_trans >> (s * 3)) & 7;

				pDst_block->set_selector(x, y, ds);
			}
		}
	}
#endif //BASISD_SUPPORT_DXT5A

	// PVRTC

#if BASISD_SUPPORT_PVRTC1
	static const  uint16_t g_pvrtc_swizzle_table[256] =
	{
		0x0000, 0x0001, 0x0004, 0x0005, 0x0010, 0x0011, 0x0014, 0x0015, 0x0040, 0x0041, 0x0044, 0x0045, 0x0050, 0x0051, 0x0054, 0x0055, 0x0100, 0x0101, 0x0104, 0x0105, 0x0110, 0x0111, 0x0114, 0x0115, 0x0140, 0x0141, 0x0144, 0x0145, 0x0150, 0x0151, 0x0154, 0x0155,
		0x0400, 0x0401, 0x0404, 0x0405, 0x0410, 0x0411, 0x0414, 0x0415, 0x0440, 0x0441, 0x0444, 0x0445, 0x0450, 0x0451, 0x0454, 0x0455, 0x0500, 0x0501, 0x0504, 0x0505, 0x0510, 0x0511, 0x0514, 0x0515, 0x0540, 0x0541, 0x0544, 0x0545, 0x0550, 0x0551, 0x0554, 0x0555,
		0x1000, 0x1001, 0x1004, 0x1005, 0x1010, 0x1011, 0x1014, 0x1015, 0x1040, 0x1041, 0x1044, 0x1045, 0x1050, 0x1051, 0x1054, 0x1055, 0x1100, 0x1101, 0x1104, 0x1105, 0x1110, 0x1111, 0x1114, 0x1115, 0x1140, 0x1141, 0x1144, 0x1145, 0x1150, 0x1151, 0x1154, 0x1155,
		0x1400, 0x1401, 0x1404, 0x1405, 0x1410, 0x1411, 0x1414, 0x1415, 0x1440, 0x1441, 0x1444, 0x1445, 0x1450, 0x1451, 0x1454, 0x1455, 0x1500, 0x1501, 0x1504, 0x1505, 0x1510, 0x1511, 0x1514, 0x1515, 0x1540, 0x1541, 0x1544, 0x1545, 0x1550, 0x1551, 0x1554, 0x1555,
		0x4000, 0x4001, 0x4004, 0x4005, 0x4010, 0x4011, 0x4014, 0x4015, 0x4040, 0x4041, 0x4044, 0x4045, 0x4050, 0x4051, 0x4054, 0x4055, 0x4100, 0x4101, 0x4104, 0x4105, 0x4110, 0x4111, 0x4114, 0x4115, 0x4140, 0x4141, 0x4144, 0x4145, 0x4150, 0x4151, 0x4154, 0x4155,
		0x4400, 0x4401, 0x4404, 0x4405, 0x4410, 0x4411, 0x4414, 0x4415, 0x4440, 0x4441, 0x4444, 0x4445, 0x4450, 0x4451, 0x4454, 0x4455, 0x4500, 0x4501, 0x4504, 0x4505, 0x4510, 0x4511, 0x4514, 0x4515, 0x4540, 0x4541, 0x4544, 0x4545, 0x4550, 0x4551, 0x4554, 0x4555,
		0x5000, 0x5001, 0x5004, 0x5005, 0x5010, 0x5011, 0x5014, 0x5015, 0x5040, 0x5041, 0x5044, 0x5045, 0x5050, 0x5051, 0x5054, 0x5055, 0x5100, 0x5101, 0x5104, 0x5105, 0x5110, 0x5111, 0x5114, 0x5115, 0x5140, 0x5141, 0x5144, 0x5145, 0x5150, 0x5151, 0x5154, 0x5155,
		0x5400, 0x5401, 0x5404, 0x5405, 0x5410, 0x5411, 0x5414, 0x5415, 0x5440, 0x5441, 0x5444, 0x5445, 0x5450, 0x5451, 0x5454, 0x5455, 0x5500, 0x5501, 0x5504, 0x5505, 0x5510, 0x5511, 0x5514, 0x5515, 0x5540, 0x5541, 0x5544, 0x5545, 0x5550, 0x5551, 0x5554, 0x5555
	};

	// Note we can't use simple calculations to convert PVRTC1 encoded endpoint components to/from 8-bits, due to hardware approximations.
	static const uint8_t g_pvrtc_5[32] = { 0,8,16,24,33,41,49,57,66,74,82,90,99,107,115,123,132,140,148,156,165,173,181,189,198,206,214,222,231,239,247,255 };
	static const uint8_t g_pvrtc_4[16] = { 0,16,33,49,66,82,99,115,140,156,173,189,206,222,239,255 };
	static const uint8_t g_pvrtc_3[8] = { 0,33,74,107,148,181,222,255 };
	static const uint8_t g_pvrtc_alpha[9] = { 0,34,68,102,136,170,204,238,255 };
		
	static const uint8_t g_pvrtc_5_floor[256] =
	{
		0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,
		3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,
		7,7,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,
		11,11,11,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,
		15,15,15,15,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,
		19,19,19,19,19,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,
		23,23,23,23,23,23,24,24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,
		27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31
	};

	static const uint8_t g_pvrtc_5_ceil[256] =
	{
		0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,
		4,4,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,
		8,8,8,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,12,12,12,12,12,
		12,12,12,12,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,16,16,16,16,
		16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19,19,19,19,19,19,19,19,20,20,20,
		20,20,20,20,20,20,21,21,21,21,21,21,21,21,22,22,22,22,22,22,22,22,23,23,23,23,23,23,23,23,24,24,
		24,24,24,24,24,24,24,25,25,25,25,25,25,25,25,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,28,
		28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,31,31,31,31,31,31,31,31
	};
		
	static const uint8_t g_pvrtc_4_floor[256] =
	{
		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
		1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
		3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
		5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,
		7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,
		9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,
		11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,
		13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15
	};

	static const uint8_t g_pvrtc_4_ceil[256] =
	{
		0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
		2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,
		6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,
		8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,10,10,10,
		10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,12,12,
		12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,
		14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15
	};
		
	static const uint8_t g_pvrtc_3_floor[256] =
	{
		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
		0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
		1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
		2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
		3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,
		4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,
		5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,
		6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7
	};

	static const uint8_t g_pvrtc_3_ceil[256] =
	{
		0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
		1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
		2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
		3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,
		5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,
		6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,
		7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
	};
		
	static const uint8_t g_pvrtc_alpha_floor[256] =
	{
		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
		0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
		1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
		2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
		3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
		5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
		6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8
	};

	static const uint8_t g_pvrtc_alpha_ceil[256] =
	{
		0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
		1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
		2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
		3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
		5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
		6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
		7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
	};

	struct pvrtc4_block
	{
		uint32_t m_modulation;
		uint32_t m_endpoints;

		pvrtc4_block() : m_modulation(0), m_endpoints(0) { }

		inline bool operator== (const pvrtc4_block& rhs) const
		{
			return (m_modulation == rhs.m_modulation) && (m_endpoints == rhs.m_endpoints);
		}

		inline void clear()
		{
			m_modulation = 0;
			m_endpoints = 0;
		}

		inline bool get_block_uses_transparent_modulation() const
		{
			return (m_endpoints & 1) != 0;
		}

		inline void set_block_uses_transparent_modulation(bool m)
		{
			m_endpoints = (m_endpoints & ~1U) | static_cast<uint32_t>(m);
		}

		inline bool is_endpoint_opaque(uint32_t endpoint_index) const
		{
			static const uint32_t s_bitmasks[2] = { 0x8000U, 0x80000000U };
			return (m_endpoints & s_bitmasks[basisu::open_range_check(endpoint_index, 2U)]) != 0;
		}

		inline void set_endpoint_opaque(uint32_t endpoint_index, bool opaque)
		{
			assert(endpoint_index < 2);
			static const uint32_t s_bitmasks[2] = { 0x8000U, 0x80000000U };
			if (opaque)
				m_endpoints |= s_bitmasks[endpoint_index];
			else
				m_endpoints &= ~s_bitmasks[endpoint_index];
		}

		inline color32 get_endpoint_5554(uint32_t endpoint_index) const
		{
			assert(endpoint_index < 2);
			static const uint32_t s_endpoint_mask[2] = { 0xFFFE, 0xFFFF };
			uint32_t packed = (m_endpoints >> (basisu::open_range_check(endpoint_index, 2U) ? 16 : 0)) & s_endpoint_mask[endpoint_index];

			uint32_t r, g, b, a;
			if (packed & 0x8000)
			{
				// opaque 554 or 555
				r = (packed >> 10) & 31;
				g = (packed >> 5) & 31;
				b = packed & 31;

				if (!endpoint_index)
					b |= (b >> 4);

				a = 0xF;
			}
			else
			{
				// translucent 4433 or 4443
				r = (packed >> 7) & 0x1E;
				g = (packed >> 3) & 0x1E;
				b = (packed & 0xF) << 1;

				r |= (r >> 4);
				g |= (g >> 4);

				if (!endpoint_index)
					b |= (b >> 3);
				else
					b |= (b >> 4);

				a = (packed >> 11) & 0xE;
			}

			assert((r < 32) && (g < 32) && (b < 32) && (a < 16));
					
			return color32(r, g, b, a);
		}
				
		inline color32 get_endpoint_8888(uint32_t endpoint_index) const
		{
			assert(endpoint_index < 2);
			static const uint32_t s_endpoint_mask[2] = { 0xFFFE, 0xFFFF };
			uint32_t packed = (m_endpoints >> (basisu::open_range_check(endpoint_index, 2U) ? 16 : 0)) & s_endpoint_mask[endpoint_index];

			uint32_t r, g, b, a;
			if (packed & 0x8000)
			{
				// opaque 554 or 555
				// 1RRRRRGGGGGBBBBM
				// 1RRRRRGGGGGBBBBB
				r = (packed >> 10) & 31;
				g = (packed >> 5) & 31;
				b = packed & 31;

				r = g_pvrtc_5[r];
				g = g_pvrtc_5[g];

				if (!endpoint_index)
					b = g_pvrtc_4[b >> 1];
				else
					b = g_pvrtc_5[b];

				a = 255;
			}
			else
			{
				// translucent 4433 or 4443
				// 0AAA RRRR GGGG BBBM
				// 0AAA RRRR GGGG BBBB
				r = (packed >> 8) & 0xF;
				g = (packed >> 4) & 0xF;
				b = packed & 0xF;
				a = (packed >> 12) & 7;

				r = g_pvrtc_4[r];
				g = g_pvrtc_4[g];

				if (!endpoint_index)
					b = g_pvrtc_3[b >> 1];
				else
					b = g_pvrtc_4[b];

				a = g_pvrtc_alpha[a];
			}
			
			return color32(r, g, b, a);
		}

		inline uint32_t get_endpoint_l8(uint32_t endpoint_index) const
		{
			color32 c(get_endpoint_8888(endpoint_index));
			return c.r + c.g + c.b + c.a;
		}
				
		inline uint32_t get_opaque_endpoint_l0() const
		{
			uint32_t packed = m_endpoints & 0xFFFE;

			uint32_t r, g, b;
			assert(packed & 0x8000);

			// opaque 554 or 555
			r = (packed >> 10) & 31;
			g = (packed >> 5) & 31;
			b = packed & 31;
			b |= (b >> 4);

			return r + g + b;
		}

		inline uint32_t get_opaque_endpoint_l1() const
		{
			uint32_t packed = m_endpoints >> 16;

			uint32_t r, g, b;
			assert(packed & 0x8000);

			// opaque 554 or 555
			r = (packed >> 10) & 31;
			g = (packed >> 5) & 31;
			b = packed & 31;

			return r + g + b;
		}

		static uint32_t get_component_precision_in_bits(uint32_t c, uint32_t endpoint_index, bool opaque_endpoint)
		{
			static const uint32_t s_comp_prec[4][4] =
			{
				// R0 G0 B0 A0      R1 G1 B1 A1
				{ 4, 4, 3, 3 },{ 4, 4, 4, 3 }, // transparent endpoint

				{ 5, 5, 4, 0 },{ 5, 5, 5, 0 }  // opaque endpoint
			};
			return s_comp_prec[basisu::open_range_check(endpoint_index, 2U) + (opaque_endpoint * 2)][basisu::open_range_check(c, 4U)];
		}

		static color32 get_color_precision_in_bits(uint32_t endpoint_index, bool opaque_endpoint)
		{
			static const color32 s_color_prec[4] =
			{
				color32(4, 4, 3, 3), color32(4, 4, 4, 3), // transparent endpoint
				color32(5, 5, 4, 0), color32(5, 5, 5, 0)  // opaque endpoint
			};
			return s_color_prec[basisu::open_range_check(endpoint_index, 2U) + (opaque_endpoint * 2)];
		}

		inline void set_opaque_endpoint_floor(uint32_t endpoint_index, const color32& c)
		{
			assert(endpoint_index < 2);
			const uint32_t m = m_endpoints & 1;

			uint32_t r = g_pvrtc_5_floor[c[0]], g = g_pvrtc_5_floor[c[1]], b = c[2];

			if (!endpoint_index)
				b = g_pvrtc_4_floor[b] << 1;
			else
				b = g_pvrtc_5_floor[b];

			// rgba=555 here
			assert((r < 32) && (g < 32) && (b < 32));

			// 1RRRRRGGGGGBBBBM
			// 1RRRRRGGGGGBBBBB

			// opaque 554 or 555
			uint32_t packed = 0x8000 | (r << 10) | (g << 5) | b;
			if (!endpoint_index)
				packed = (packed & ~1) | m;

			assert(packed <= 0xFFFF);

			if (endpoint_index)
				m_endpoints = (m_endpoints & 0xFFFFU) | (packed << 16);
			else
				m_endpoints = (m_endpoints & 0xFFFF0000U) | packed;
		}

		inline void set_opaque_endpoint_ceil(uint32_t endpoint_index, const color32& c)
		{
			assert(endpoint_index < 2);
			const uint32_t m = m_endpoints & 1;

			uint32_t r = g_pvrtc_5_ceil[c[0]], g = g_pvrtc_5_ceil[c[1]], b = c[2];

			if (!endpoint_index)
				b = g_pvrtc_4_ceil[b] << 1;
			else
				b = g_pvrtc_5_ceil[b];

			// rgba=555 here
			assert((r < 32) && (g < 32) && (b < 32));

			// 1RRRRRGGGGGBBBBM
			// 1RRRRRGGGGGBBBBB

			// opaque 554 or 555
			uint32_t packed = 0x8000 | (r << 10) | (g << 5) | b;
			if (!endpoint_index)
				packed |= m;

			assert(packed <= 0xFFFF);

			if (endpoint_index)
				m_endpoints = (m_endpoints & 0xFFFFU) | (packed << 16);
			else
				m_endpoints = (m_endpoints & 0xFFFF0000U) | packed;
		}
				
		// opaque endpoints:	554 or 555
		// transparent endpoints: 3443 or 3444
		inline void set_endpoint_raw(uint32_t endpoint_index, const color32& c, bool opaque_endpoint)
		{
			assert(endpoint_index < 2);
			const uint32_t m = m_endpoints & 1;
			uint32_t r = c[0], g = c[1], b = c[2], a = c[3];

			uint32_t packed;

			if (opaque_endpoint)
			{
				if (!endpoint_index)
				{
					// 554
					// 1RRRRRGGGGGBBBBM
					assert((r < 32) && (g < 32) && (b < 16));
					packed = 0x8000 | (r << 10) | (g << 5) | (b << 1) | m;
				}
				else
				{
					// 555
					// 1RRRRRGGGGGBBBBB
					assert((r < 32) && (g < 32) && (b < 32));
					packed = 0x8000 | (r << 10) | (g << 5) | b;
				}
			}
			else
			{
				if (!endpoint_index)
				{
					// 3443
					// 0AAA RRRR GGGG BBBM
					assert((r < 16) && (g < 16) && (b < 8) && (a < 8));
					packed = (a << 12) | (r << 8) | (g << 4) | (b << 1) | m;
				}
				else
				{
					// 3444
					// 0AAA RRRR GGGG BBBB
					assert((r < 16) && (g < 16) && (b < 16) && (a < 8));
					packed = (a << 12) | (r << 8) | (g << 4) | b;
				}
			}

			assert(packed <= 0xFFFF);

			if (endpoint_index)
				m_endpoints = (m_endpoints & 0xFFFFU) | (packed << 16);
			else
				m_endpoints = (m_endpoints & 0xFFFF0000U) | packed;
		}
				
		inline void set_endpoint_floor(uint32_t endpoint_index, const color32& c)
		{
			assert(endpoint_index < 2);

			int a = g_pvrtc_alpha_floor[c.a];
			if (a == 8)
			{
				// 554 or 555
				uint32_t r = g_pvrtc_5_floor[c[0]], g = g_pvrtc_5_floor[c[1]], b = c[2];

				if (!endpoint_index)
					b = g_pvrtc_4_floor[b];
				else
					b = g_pvrtc_5_floor[b];

				set_endpoint_raw(endpoint_index, color32(r, g, b, a), true);
			}
			else
			{
				// 4433 or 4443
				uint32_t r = g_pvrtc_4_floor[c[0]], g = g_pvrtc_4_floor[c[1]], b = c[2];

				if (!endpoint_index)
					b = g_pvrtc_3_floor[b];
				else
					b = g_pvrtc_4_floor[b];

				set_endpoint_raw(endpoint_index, color32(r, g, b, a), false);
			}
		}

		inline void set_endpoint_ceil(uint32_t endpoint_index, const color32& c)
		{
			assert(endpoint_index < 2);

			int a = g_pvrtc_alpha_ceil[c.a];
			if (a == 8)
			{
				// 554 or 555
				uint32_t r = g_pvrtc_5_ceil[c[0]], g = g_pvrtc_5_ceil[c[1]], b = c[2];

				if (!endpoint_index)
					b = g_pvrtc_4_ceil[b];
				else
					b = g_pvrtc_5_ceil[b];

				set_endpoint_raw(endpoint_index, color32(r, g, b, a), true);
			}
			else
			{
				// 4433 or 4443
				uint32_t r = g_pvrtc_4_ceil[c[0]], g = g_pvrtc_4_ceil[c[1]], b = c[2];

				if (!endpoint_index)
					b = g_pvrtc_3_ceil[b];
				else
					b = g_pvrtc_4_ceil[b];

				set_endpoint_raw(endpoint_index, color32(r, g, b, a), false);
			}
		}

		inline uint32_t get_modulation(uint32_t x, uint32_t y) const
		{
			assert((x < 4) && (y < 4));
			return (m_modulation >> ((y * 4 + x) * 2)) & 3;
		}

		// Scaled by 8
		inline const uint32_t* get_scaled_modulation_values(bool block_uses_transparent_modulation) const
		{
			static const uint32_t s_block_scales[2][4] = { { 0, 3, 5, 8 },{ 0, 4, 4, 8 } };
			return s_block_scales[block_uses_transparent_modulation];
		}

		// Scaled by 8
		inline uint32_t get_scaled_modulation(uint32_t x, uint32_t y) const
		{
			return get_scaled_modulation_values(get_block_uses_transparent_modulation())[get_modulation(x, y)];
		}

		inline void set_modulation(uint32_t x, uint32_t y, uint32_t s)
		{
			assert((x < 4) && (y < 4) && (s < 4));
			uint32_t n = (y * 4 + x) * 2;
			m_modulation = (m_modulation & (~(3 << n))) | (s << n);
			assert(get_modulation(x, y) == s);
		}

		// Assumes modulation was initialized to 0
		inline void set_modulation_fast(uint32_t x, uint32_t y, uint32_t s)
		{
			assert((x < 4) && (y < 4) && (s < 4));
			uint32_t n = (y * 4 + x) * 2;
			m_modulation |= (s << n);
			assert(get_modulation(x, y) == s);
		}
	};

	static const uint8_t g_pvrtc_bilinear_weights[16][4] =
	{
		{ 4, 4, 4, 4 }, { 2, 6, 2, 6 }, { 8, 0, 8, 0 }, { 6, 2, 6, 2 },
		{ 2, 2, 6, 6 }, { 1, 3, 3, 9 }, { 4, 0, 12, 0 }, { 3, 1, 9, 3 },
		{ 8, 8, 0, 0 }, { 4, 12, 0, 0 }, { 16, 0, 0, 0 }, { 12, 4, 0, 0 },
		{ 6, 6, 2, 2 }, { 3, 9, 1, 3 }, { 12, 0, 4, 0 }, { 9, 3, 3, 1 },
	};

	struct pvrtc1_temp_block
	{
		decoder_etc_block m_etc1_block;
		uint32_t m_pvrtc_endpoints;
	};

	static inline uint32_t get_opaque_endpoint_l0(uint32_t endpoints)
	{
		uint32_t packed = endpoints;

		uint32_t r, g, b;
		assert(packed & 0x8000);

		r = (packed >> 10) & 31;
		g = (packed >> 5) & 31;
		b = packed & 30;
		b |= (b >> 4);

		return r + g + b;
	}

	static inline uint32_t get_opaque_endpoint_l1(uint32_t endpoints)
	{
		uint32_t packed = endpoints >> 16;

		uint32_t r, g, b;
		assert(packed & 0x8000);

		r = (packed >> 10) & 31;
		g = (packed >> 5) & 31;
		b = packed & 31;

		return r + g + b;
	}

	static color32 get_endpoint_8888(uint32_t endpoints, uint32_t endpoint_index)
	{
		assert(endpoint_index < 2);
		static const uint32_t s_endpoint_mask[2] = { 0xFFFE, 0xFFFF };
		uint32_t packed = (endpoints >> (basisu::open_range_check(endpoint_index, 2U) ? 16 : 0)) & s_endpoint_mask[endpoint_index];

		uint32_t r, g, b, a;
		if (packed & 0x8000)
		{
			// opaque 554 or 555
			// 1RRRRRGGGGGBBBBM
			// 1RRRRRGGGGGBBBBB
			r = (packed >> 10) & 31;
			g = (packed >> 5) & 31;
			b = packed & 31;

			r = g_pvrtc_5[r];
			g = g_pvrtc_5[g];

			if (!endpoint_index)
				b = g_pvrtc_4[b >> 1];
			else
				b = g_pvrtc_5[b];

			a = 255;
		}
		else
		{
			// translucent 4433 or 4443
			// 0AAA RRRR GGGG BBBM
			// 0AAA RRRR GGGG BBBB
			r = (packed >> 8) & 0xF;
			g = (packed >> 4) & 0xF;
			b = packed & 0xF;
			a = (packed >> 12) & 7;

			r = g_pvrtc_4[r];
			g = g_pvrtc_4[g];

			if (!endpoint_index)
				b = g_pvrtc_3[b >> 1];
			else
				b = g_pvrtc_4[b];

			a = g_pvrtc_alpha[a];
		}

		return color32(r, g, b, a);
	}

	static uint32_t get_endpoint_l8(uint32_t endpoints, uint32_t endpoint_index)
	{
		color32 c(get_endpoint_8888(endpoints, endpoint_index));
		return c.r + c.g + c.b + c.a;
	}

	// TODO: Support decoding a non-pow2 ETC1S texture into the next larger pow2 PVRTC texture.
	static void fixup_pvrtc1_4_modulation_rgb(const decoder_etc_block* pETC_Blocks, const uint32_t* pPVRTC_endpoints, void* pDst_blocks, uint32_t num_blocks_x, uint32_t num_blocks_y, bool pvrtc_wrap_addressing)
	{
		const uint32_t x_mask = num_blocks_x - 1;
		const uint32_t y_mask = num_blocks_y - 1;
		const uint32_t x_bits = basisu::total_bits(x_mask);
		const uint32_t y_bits = basisu::total_bits(y_mask);
		const uint32_t min_bits = basisu::minimum(x_bits, y_bits);
		const uint32_t max_bits = basisu::maximum(x_bits, y_bits);
		const uint32_t swizzle_mask = (1 << (min_bits * 2)) - 1;

		uint32_t block_index = 0;

		// really 3x3
		int e0[4][4], e1[4][4];

		for (int y = 0; y < static_cast<int>(num_blocks_y); y++)
		{
			const uint32_t* pE_rows[3];

			for (int ey = 0; ey < 3; ey++)
			{
				int by = y + ey - 1; if (!pvrtc_wrap_addressing) by = basisu::clamp<int>(by, 0, y_mask);

				const uint32_t* pE = &pPVRTC_endpoints[(by & y_mask) * num_blocks_x];

				pE_rows[ey] = pE;

				for (int ex = 0; ex < 3; ex++)
				{
					int bx = 0 + ex - 1; if (!pvrtc_wrap_addressing) bx = basisu::clamp<int>(bx, 0, x_mask);

					const uint32_t e = pE[bx & x_mask];

					e0[ex][ey] = (get_opaque_endpoint_l0(e) * 255) / 31;
					e1[ex][ey] = (get_opaque_endpoint_l1(e) * 255) / 31;
				}
			}

			const uint32_t y_swizzle = (g_pvrtc_swizzle_table[y >> 8] << 16) | g_pvrtc_swizzle_table[y & 0xFF];

			for (int x = 0; x < static_cast<int>(num_blocks_x); x++, block_index++)
			{
				const decoder_etc_block& src_block = pETC_Blocks[block_index];

				const uint32_t x_swizzle = (g_pvrtc_swizzle_table[x >> 8] << 17) | (g_pvrtc_swizzle_table[x & 0xFF] << 1);

				uint32_t swizzled = x_swizzle | y_swizzle;
				if (num_blocks_x != num_blocks_y)
				{
					swizzled &= swizzle_mask;

					if (num_blocks_x > num_blocks_y)
						swizzled |= ((x >> min_bits) << (min_bits * 2));
					else
						swizzled |= ((y >> min_bits) << (min_bits * 2));
				}

				pvrtc4_block* pDst_block = static_cast<pvrtc4_block*>(pDst_blocks) + swizzled;
				pDst_block->m_endpoints = pPVRTC_endpoints[block_index];

				uint32_t base_r = g_etc_5_to_8[src_block.m_differential.m_red1];
				uint32_t base_g = g_etc_5_to_8[src_block.m_differential.m_green1];
				uint32_t base_b = g_etc_5_to_8[src_block.m_differential.m_blue1];

				const int* pInten_table48 = g_etc1_inten_tables48[src_block.m_differential.m_cw1];
				int by = (base_r + base_g + base_b) * 16;
				int block_colors_y_x16[4];
				block_colors_y_x16[0] = by + pInten_table48[2];
				block_colors_y_x16[1] = by + pInten_table48[3];
				block_colors_y_x16[2] = by + pInten_table48[1];
				block_colors_y_x16[3] = by + pInten_table48[0];

				{
					const uint32_t ex = 2;
					int bx = x + ex - 1;
					if (!pvrtc_wrap_addressing)
						bx = basisu::clamp<int>(bx, 0, x_mask);
					bx &= x_mask;

#define DO_ROW(ey) \
					{ \
						const uint32_t e = pE_rows[ey][bx]; \
						e0[ex][ey] = (get_opaque_endpoint_l0(e) * 255) / 31; \
						e1[ex][ey] = (get_opaque_endpoint_l1(e) * 255) / 31; \
					}

					DO_ROW(0);
					DO_ROW(1);
					DO_ROW(2);
#undef DO_ROW
				}

				uint32_t mod = 0;

				uint32_t lookup_x[4];

#define DO_LOOKUP(lx) { \
					const uint32_t byte_ofs = 7 - (((lx) * 4) >> 3); \
					const uint32_t lsb_bits = src_block.m_bytes[byte_ofs] >> (((lx) & 1) * 4); \
					const uint32_t msb_bits = src_block.m_bytes[byte_ofs - 2] >> (((lx) & 1) * 4); \
					lookup_x[lx] = (lsb_bits & 0xF) | ((msb_bits & 0xF) << 4); }

				DO_LOOKUP(0);
				DO_LOOKUP(1);
				DO_LOOKUP(2);
				DO_LOOKUP(3);
#undef DO_LOOKUP

#define DO_PIX(lx, ly, w0, w1, w2, w3) \
				{ \
					int ca_l = a0 * w0 + a1 * w1 + a2 * w2 + a3 * w3; \
					int cb_l = b0 * w0 + b1 * w1 + b2 * w2 + b3 * w3; \
					int cl = block_colors_y_x16[g_etc1_x_selector_unpack[ly][lookup_x[lx]]]; \
					int dl = cb_l - ca_l; \
					int vl = cl - ca_l; \
					int p = vl * 16; \
					if (ca_l > cb_l) { p = -p; dl = -dl; } \
					uint32_t m = 0; \
					if (p > 3 * dl) m = (uint32_t)(1 << ((ly) * 8 + (lx) * 2)); \
					if (p > 8 * dl) m = (uint32_t)(2 << ((ly) * 8 + (lx) * 2)); \
					if (p > 13 * dl) m = (uint32_t)(3 << ((ly) * 8 + (lx) * 2)); \
					mod |= m; \
				}

				{
					const uint32_t ex = 0, ey = 0;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(0, 0, 4, 4, 4, 4);
					DO_PIX(1, 0, 2, 6, 2, 6);
					DO_PIX(0, 1, 2, 2, 6, 6);
					DO_PIX(1, 1, 1, 3, 3, 9);
				}

				{
					const uint32_t ex = 1, ey = 0;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(2, 0, 8, 0, 8, 0);
					DO_PIX(3, 0, 6, 2, 6, 2);
					DO_PIX(2, 1, 4, 0, 12, 0);
					DO_PIX(3, 1, 3, 1, 9, 3);
				}

				{
					const uint32_t ex = 0, ey = 1;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(0, 2, 8, 8, 0, 0);
					DO_PIX(1, 2, 4, 12, 0, 0);
					DO_PIX(0, 3, 6, 6, 2, 2);
					DO_PIX(1, 3, 3, 9, 1, 3);
				}

				{
					const uint32_t ex = 1, ey = 1;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(2, 2, 16, 0, 0, 0);
					DO_PIX(3, 2, 12, 4, 0, 0);
					DO_PIX(2, 3, 12, 0, 4, 0);
					DO_PIX(3, 3, 9, 3, 3, 1);
				}
#undef DO_PIX

				pDst_block->m_modulation = mod;

				e0[0][0] = e0[1][0]; e0[1][0] = e0[2][0];
				e0[0][1] = e0[1][1]; e0[1][1] = e0[2][1];
				e0[0][2] = e0[1][2]; e0[1][2] = e0[2][2];

				e1[0][0] = e1[1][0]; e1[1][0] = e1[2][0];
				e1[0][1] = e1[1][1]; e1[1][1] = e1[2][1];
				e1[0][2] = e1[1][2]; e1[1][2] = e1[2][2];

			} // x
		} // y
	}

	static void fixup_pvrtc1_4_modulation_rgba(
		const decoder_etc_block* pETC_Blocks, 
		const uint32_t* pPVRTC_endpoints, 
		void* pDst_blocks, uint32_t num_blocks_x, uint32_t num_blocks_y, bool pvrtc_wrap_addressing, void *pAlpha_blocks,
		const endpoint* pEndpoints, const selector* pSelectors)
	{
		const uint32_t x_mask = num_blocks_x - 1;
		const uint32_t y_mask = num_blocks_y - 1;
		const uint32_t x_bits = basisu::total_bits(x_mask);
		const uint32_t y_bits = basisu::total_bits(y_mask);
		const uint32_t min_bits = basisu::minimum(x_bits, y_bits);
		const uint32_t max_bits = basisu::maximum(x_bits, y_bits);
		const uint32_t swizzle_mask = (1 << (min_bits * 2)) - 1;

		uint32_t block_index = 0;

		// really 3x3
		int e0[4][4], e1[4][4];

		for (int y = 0; y < static_cast<int>(num_blocks_y); y++)
		{
			const uint32_t* pE_rows[3];

			for (int ey = 0; ey < 3; ey++)
			{
				int by = y + ey - 1; if (!pvrtc_wrap_addressing) by = basisu::clamp<int>(by, 0, y_mask);

				const uint32_t* pE = &pPVRTC_endpoints[(by & y_mask) * num_blocks_x];

				pE_rows[ey] = pE;

				for (int ex = 0; ex < 3; ex++)
				{
					int bx = 0 + ex - 1; if (!pvrtc_wrap_addressing) bx = basisu::clamp<int>(bx, 0, x_mask);

					const uint32_t e = pE[bx & x_mask];

					e0[ex][ey] = get_endpoint_l8(e, 0);
					e1[ex][ey] = get_endpoint_l8(e, 1);
				}
			}

			const uint32_t y_swizzle = (g_pvrtc_swizzle_table[y >> 8] << 16) | g_pvrtc_swizzle_table[y & 0xFF];

			for (int x = 0; x < static_cast<int>(num_blocks_x); x++, block_index++)
			{
				const decoder_etc_block& src_block = pETC_Blocks[block_index];
				
				const uint16_t* pSrc_alpha_block = reinterpret_cast<const uint16_t*>(static_cast<const uint32_t*>(pAlpha_blocks) + x + (y * num_blocks_x));
				const endpoint* pAlpha_endpoints = &pEndpoints[pSrc_alpha_block[0]];
				const selector* pAlpha_selectors = &pSelectors[pSrc_alpha_block[1]];
				
				const uint32_t x_swizzle = (g_pvrtc_swizzle_table[x >> 8] << 17) | (g_pvrtc_swizzle_table[x & 0xFF] << 1);
				
				uint32_t swizzled = x_swizzle | y_swizzle;
				if (num_blocks_x != num_blocks_y)
				{
					swizzled &= swizzle_mask;

					if (num_blocks_x > num_blocks_y)
						swizzled |= ((x >> min_bits) << (min_bits * 2));
					else
						swizzled |= ((y >> min_bits) << (min_bits * 2));
				}

				pvrtc4_block* pDst_block = static_cast<pvrtc4_block*>(pDst_blocks) + swizzled;
				pDst_block->m_endpoints = pPVRTC_endpoints[block_index];

				uint32_t base_r = g_etc_5_to_8[src_block.m_differential.m_red1];
				uint32_t base_g = g_etc_5_to_8[src_block.m_differential.m_green1];
				uint32_t base_b = g_etc_5_to_8[src_block.m_differential.m_blue1];

				const int* pInten_table48 = g_etc1_inten_tables48[src_block.m_differential.m_cw1];
				int by = (base_r + base_g + base_b) * 16;
				int block_colors_y_x16[4];
				block_colors_y_x16[0] = basisu::clamp<int>(by + pInten_table48[0], 0, 48 * 255);
				block_colors_y_x16[1] = basisu::clamp<int>(by + pInten_table48[1], 0, 48 * 255);
				block_colors_y_x16[2] = basisu::clamp<int>(by + pInten_table48[2], 0, 48 * 255);
				block_colors_y_x16[3] = basisu::clamp<int>(by + pInten_table48[3], 0, 48 * 255);

				uint32_t alpha_base_g = g_etc_5_to_8[pAlpha_endpoints->m_color5.g] * 16;
				const int* pInten_table16 = g_etc1_inten_tables16[pAlpha_endpoints->m_inten5];
				int alpha_block_colors_x16[4];
				alpha_block_colors_x16[0] = basisu::clamp<int>(alpha_base_g + pInten_table16[0], 0, 16 * 255);
				alpha_block_colors_x16[1] = basisu::clamp<int>(alpha_base_g + pInten_table16[1], 0, 16 * 255);
				alpha_block_colors_x16[2] = basisu::clamp<int>(alpha_base_g + pInten_table16[2], 0, 16 * 255);
				alpha_block_colors_x16[3] = basisu::clamp<int>(alpha_base_g + pInten_table16[3], 0, 16 * 255);

				// clamp((base_r + base_g + base_b) * 16 + color_inten[s] * 48) + clamp(alpha_base_g * 16 + alpha_inten[as] * 16)

				{
					const uint32_t ex = 2;
					int bx = x + ex - 1;
					if (!pvrtc_wrap_addressing)
						bx = basisu::clamp<int>(bx, 0, x_mask);
					bx &= x_mask;

#define DO_ROW(ey) \
					{ \
						const uint32_t e = pE_rows[ey][bx]; \
						e0[ex][ey] = get_endpoint_l8(e, 0); \
						e1[ex][ey] = get_endpoint_l8(e, 1); \
					}

					DO_ROW(0);
					DO_ROW(1);
					DO_ROW(2);
#undef DO_ROW
				}

				uint32_t mod = 0;

#define DO_PIX(lx, ly, w0, w1, w2, w3) \
				{ \
					int ca_l = a0 * w0 + a1 * w1 + a2 * w2 + a3 * w3; \
					int cb_l = b0 * w0 + b1 * w1 + b2 * w2 + b3 * w3; \
					int cl = block_colors_y_x16[(src_block.m_bytes[4 + ly] >> (lx * 2)) & 3] + alpha_block_colors_x16[(pAlpha_selectors->m_selectors[ly] >> (lx * 2)) & 3]; \
					int dl = cb_l - ca_l; \
					int vl = cl - ca_l; \
					int p = vl * 16; \
					if (ca_l > cb_l) { p = -p; dl = -dl; } \
					uint32_t m = 0; \
					if (p > 3 * dl) m = (uint32_t)(1 << ((ly) * 8 + (lx) * 2)); \
					if (p > 8 * dl) m = (uint32_t)(2 << ((ly) * 8 + (lx) * 2)); \
					if (p > 13 * dl) m = (uint32_t)(3 << ((ly) * 8 + (lx) * 2)); \
					mod |= m; \
				}

				{
					const uint32_t ex = 0, ey = 0;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(0, 0, 4, 4, 4, 4);
					DO_PIX(1, 0, 2, 6, 2, 6);
					DO_PIX(0, 1, 2, 2, 6, 6);
					DO_PIX(1, 1, 1, 3, 3, 9);
				}

				{
					const uint32_t ex = 1, ey = 0;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(2, 0, 8, 0, 8, 0);
					DO_PIX(3, 0, 6, 2, 6, 2);
					DO_PIX(2, 1, 4, 0, 12, 0);
					DO_PIX(3, 1, 3, 1, 9, 3);
				}

				{
					const uint32_t ex = 0, ey = 1;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(0, 2, 8, 8, 0, 0);
					DO_PIX(1, 2, 4, 12, 0, 0);
					DO_PIX(0, 3, 6, 6, 2, 2);
					DO_PIX(1, 3, 3, 9, 1, 3);
				}

				{
					const uint32_t ex = 1, ey = 1;
					const int a0 = e0[ex][ey], a1 = e0[ex + 1][ey], a2 = e0[ex][ey + 1], a3 = e0[ex + 1][ey + 1];
					const int b0 = e1[ex][ey], b1 = e1[ex + 1][ey], b2 = e1[ex][ey + 1], b3 = e1[ex + 1][ey + 1];
					DO_PIX(2, 2, 16, 0, 0, 0);
					DO_PIX(3, 2, 12, 4, 0, 0);
					DO_PIX(2, 3, 12, 0, 4, 0);
					DO_PIX(3, 3, 9, 3, 3, 1);
				}
#undef DO_PIX

				pDst_block->m_modulation = mod;

				e0[0][0] = e0[1][0]; e0[1][0] = e0[2][0];
				e0[0][1] = e0[1][1]; e0[1][1] = e0[2][1];
				e0[0][2] = e0[1][2]; e0[1][2] = e0[2][2];

				e1[0][0] = e1[1][0]; e1[1][0] = e1[2][0];
				e1[0][1] = e1[1][1]; e1[1][1] = e1[2][1];
				e1[0][2] = e1[1][2]; e1[1][2] = e1[2][2];

			} // x
		} // y
	}
#endif // BASISD_SUPPORT_PVRTC1

#if BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
	struct bc7_mode_6
	{
		struct
		{
			uint64_t m_mode : 7;
			uint64_t m_r0 : 7;
			uint64_t m_r1 : 7;
			uint64_t m_g0 : 7;
			uint64_t m_g1 : 7;
			uint64_t m_b0 : 7;
			uint64_t m_b1 : 7;
			uint64_t m_a0 : 7;
			uint64_t m_a1 : 7;
			uint64_t m_p0 : 1;
		} m_lo;

		union
		{
			struct
			{
				uint64_t m_p1 : 1;
				uint64_t m_s00 : 3;
				uint64_t m_s10 : 4;
				uint64_t m_s20 : 4;
				uint64_t m_s30 : 4;

				uint64_t m_s01 : 4;
				uint64_t m_s11 : 4;
				uint64_t m_s21 : 4;
				uint64_t m_s31 : 4;

				uint64_t m_s02 : 4;
				uint64_t m_s12 : 4;
				uint64_t m_s22 : 4;
				uint64_t m_s32 : 4;

				uint64_t m_s03 : 4;
				uint64_t m_s13 : 4;
				uint64_t m_s23 : 4;
				uint64_t m_s33 : 4;

			} m_hi;

			uint64_t m_hi_bits;
		};
	};

	static void convert_etc1s_to_bc7_m6(bc7_mode_6* pDst_block, const endpoint *pEndpoint, const selector* pSelector)
	{
#if !BASISD_WRITE_NEW_BC7_TABLES
		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;
				
		const uint32_t base_color_r = pEndpoint->m_color5.r;
		const uint32_t base_color_g = pEndpoint->m_color5.g;
		const uint32_t base_color_b = pEndpoint->m_color5.b;
		const uint32_t inten_table = pEndpoint->m_inten5;

		if (pSelector->m_num_unique_selectors <= 2)
		{
			// Only two unique selectors so just switch to block truncation coding (BTC) to avoid quality issues on extreme blocks.
			pDst_block->m_lo.m_mode = 64;

			pDst_block->m_lo.m_a0 = 127;
			pDst_block->m_lo.m_a1 = 127;

			color32 block_colors[4];

			decoder_etc_block::get_block_colors5(block_colors, color32(base_color_r, base_color_g, base_color_b, 255), inten_table);

			const uint32_t r0 = block_colors[low_selector].r;
			const uint32_t g0 = block_colors[low_selector].g;
			const uint32_t b0 = block_colors[low_selector].b;
			const uint32_t low_bits0 = (r0 & 1) + (g0 & 1) + (b0 & 1);
			uint32_t p0 = low_bits0 >= 2;

			const uint32_t r1 = block_colors[high_selector].r;
			const uint32_t g1 = block_colors[high_selector].g;
			const uint32_t b1 = block_colors[high_selector].b;
			const uint32_t low_bits1 = (r1 & 1) + (g1 & 1) + (b1 & 1);
			uint32_t p1 = low_bits1 >= 2;

			pDst_block->m_lo.m_r0 = r0 >> 1;
			pDst_block->m_lo.m_g0 = g0 >> 1;
			pDst_block->m_lo.m_b0 = b0 >> 1;
			pDst_block->m_lo.m_p0 = p0;

			pDst_block->m_lo.m_r1 = r1 >> 1;
			pDst_block->m_lo.m_g1 = g1 >> 1;
			pDst_block->m_lo.m_b1 = b1 >> 1;

			uint32_t output_low_selector = 0;
			uint32_t output_bit_offset = 1;
			uint64_t output_hi_bits = p1;

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					uint32_t os = (s == low_selector) ? output_low_selector : (15 ^ output_low_selector);

					uint32_t num_bits = 4;

					if ((x | y) == 0)
					{
						if (os & 8)
						{
							pDst_block->m_lo.m_r0 = r1 >> 1;
							pDst_block->m_lo.m_g0 = g1 >> 1;
							pDst_block->m_lo.m_b0 = b1 >> 1;
							pDst_block->m_lo.m_p0 = p1;

							pDst_block->m_lo.m_r1 = r0 >> 1;
							pDst_block->m_lo.m_g1 = g0 >> 1;
							pDst_block->m_lo.m_b1 = b0 >> 1;

							output_hi_bits &= ~1ULL;
							output_hi_bits |= p0;
							std::swap(p0, p1);

							output_low_selector = 15;
							os = 0;
						}

						num_bits = 3;
					}

					output_hi_bits |= (static_cast<uint64_t>(os) << output_bit_offset);
					output_bit_offset += num_bits;
				}
			}

			pDst_block->m_hi_bits = output_hi_bits;

			assert(pDst_block->m_hi.m_p1 == p1);

			return;
		}

		uint32_t selector_range_table = g_etc1_to_bc7_m6_selector_range_index[low_selector][high_selector];

		const uint32_t* pTable_r = g_etc1_to_bc7_m6_table[base_color_r + inten_table * 32] + (selector_range_table * NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS);
		const uint32_t* pTable_g = g_etc1_to_bc7_m6_table[base_color_g + inten_table * 32] + (selector_range_table * NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS);
		const uint32_t* pTable_b = g_etc1_to_bc7_m6_table[base_color_b + inten_table * 32] + (selector_range_table * NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS);

#if 1
		assert(NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS == 48);

		uint32_t best_err0 = UINT_MAX, best_err1 = UINT_MAX;

#define DO_ITER2(idx) \
		{  \
			uint32_t v0 = ((pTable_r[(idx)+0] + pTable_g[(idx)+0] + pTable_b[(idx)+0]) << 14) | ((idx) + 0); if (v0 < best_err0) best_err0 = v0; \
			uint32_t v1 = ((pTable_r[(idx)+1] + pTable_g[(idx)+1] + pTable_b[(idx)+1]) << 14) | ((idx) + 1); if (v1 < best_err1) best_err1 = v1; \
		}
#define DO_ITER4(idx) DO_ITER2(idx); DO_ITER2((idx) + 2);
#define DO_ITER8(idx) DO_ITER4(idx); DO_ITER4((idx) + 4);
#define DO_ITER16(idx) DO_ITER8(idx); DO_ITER8((idx) + 8);

		DO_ITER16(0);
		DO_ITER16(16);
		DO_ITER16(32);
#undef DO_ITER2
#undef DO_ITER4
#undef DO_ITER8
#undef DO_ITER16

		uint32_t best_err = basisu::minimum(best_err0, best_err1);
		uint32_t best_mapping = best_err & 0xFF;
		//best_err >>= 14;
#else
		uint32_t best_err = UINT_MAX;
		uint32_t best_mapping = 0;
		assert((NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS % 2) == 0);
		for (uint32_t m = 0; m < NUM_ETC1_TO_BC7_M6_SELECTOR_MAPPINGS; m += 2)
		{
#define DO_ITER(idx)	{ uint32_t total_err = (pTable_r[idx] + pTable_g[idx] + pTable_b[idx]) & 0x3FFFF; if (total_err < best_err) { best_err = total_err; best_mapping = idx; } }
			DO_ITER(m);
			DO_ITER(m + 1);
#undef DO_ITER
		}
#endif		

		pDst_block->m_lo.m_mode = 64;

		pDst_block->m_lo.m_a0 = 127;
		pDst_block->m_lo.m_a1 = 127;

		uint64_t v = 0;
		const uint8_t* pSelectors_xlat;

		if (g_etc1_to_bc7_selector_mappings[best_mapping][pSelector->get_selector(0, 0)] & 8)
		{
			pDst_block->m_lo.m_r1 = (pTable_r[best_mapping] >> 18) & 0x7F;
			pDst_block->m_lo.m_g1 = (pTable_g[best_mapping] >> 18) & 0x7F;
			pDst_block->m_lo.m_b1 = (pTable_b[best_mapping] >> 18) & 0x7F;

			pDst_block->m_lo.m_r0 = (pTable_r[best_mapping] >> 25) & 0x7F;
			pDst_block->m_lo.m_g0 = (pTable_g[best_mapping] >> 25) & 0x7F;
			pDst_block->m_lo.m_b0 = (pTable_b[best_mapping] >> 25) & 0x7F;

			pDst_block->m_lo.m_p0 = 1;
			pDst_block->m_hi.m_p1 = 0;

			v = 0;
			pSelectors_xlat = &g_etc1_to_bc7_selector_mappings_inv[best_mapping][0];
		}
		else
		{
			pDst_block->m_lo.m_r0 = (pTable_r[best_mapping] >> 18) & 0x7F;
			pDst_block->m_lo.m_g0 = (pTable_g[best_mapping] >> 18) & 0x7F;
			pDst_block->m_lo.m_b0 = (pTable_b[best_mapping] >> 18) & 0x7F;

			pDst_block->m_lo.m_r1 = (pTable_r[best_mapping] >> 25) & 0x7F;
			pDst_block->m_lo.m_g1 = (pTable_g[best_mapping] >> 25) & 0x7F;
			pDst_block->m_lo.m_b1 = (pTable_b[best_mapping] >> 25) & 0x7F;

			pDst_block->m_lo.m_p0 = 0;
			pDst_block->m_hi.m_p1 = 1;

			v = 1;
			pSelectors_xlat = &g_etc1_to_bc7_selector_mappings[best_mapping][0];
		}

		uint64_t v1 = 0, v2 = 0, v3 = 0;

#define DO_X(x, s0, s1, s2, s3) { \
		v |= ((uint64_t)pSelectors_xlat[(pSelector->m_selectors[0] >> ((x) * 2)) & 3] << (s0)); \
		v1 |= ((uint64_t)pSelectors_xlat[(pSelector->m_selectors[1] >> ((x) * 2)) & 3] << (s1)); \
		v2 |= ((uint64_t)pSelectors_xlat[(pSelector->m_selectors[2] >> ((x) * 2)) & 3] << (s2)); \
		v3 |= ((uint64_t)pSelectors_xlat[(pSelector->m_selectors[3] >> ((x) * 2)) & 3] << (s3)); }

		// 1  4  8  12
		// 16 20 24 28
		// 32 36 40 44
		// 48 52 56 60

		DO_X(0, 1, 16, 32, 48);
		DO_X(1, 4, 20, 36, 52);
		DO_X(2, 8, 24, 40, 56);
		DO_X(3, 12, 28, 44, 60);
#undef DO_X

		pDst_block->m_hi_bits = v | v1 | v2 | v3;
#endif

	}
#endif // BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY

#if BASISD_SUPPORT_BC7_MODE5
	static dxt_selector_range g_etc1_to_bc7_m5_selector_ranges[] =
	{
		{ 0, 3 },
		{ 1, 3 },
		{ 0, 2 },
		{ 1, 2 },
		{ 2, 3 },
		{ 0, 1 },
	};

	const uint32_t NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES = sizeof(g_etc1_to_bc7_m5_selector_ranges) / sizeof(g_etc1_to_bc7_m5_selector_ranges[0]);

	static uint32_t g_etc1_to_bc7_m5_selector_range_index[4][4];
	
	const uint32_t NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS = 10;
	static const uint8_t g_etc1_to_bc7_m5_selector_mappings[NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS][4] =
	{
		{ 0, 0, 1, 1 },
		{ 0, 0, 1, 2 },
		{ 0, 0, 1, 3 },
		{ 0, 0, 2, 3 },
		{ 0, 1, 1, 1 },
		{ 0, 1, 2, 2 },
		{ 0, 1, 2, 3 },
		{ 0, 2, 3, 3 },
		{ 1, 2, 2, 2 },
		{ 1, 2, 3, 3 },
	};

	struct etc1_to_bc7_m5_solution
	{
		uint8_t m_lo;
		uint8_t m_hi;
		uint16_t m_err;
	};
		
	static const etc1_to_bc7_m5_solution g_etc1_to_bc7_m5_color[32 * 8 * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS * NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_bc7_m5_color.inc"
	};
	
	static dxt_selector_range g_etc1_to_bc7_m5a_selector_ranges[] =
	{
		{ 0, 3 },
		{ 1, 3 },
		{ 0, 2 },
		{ 1, 2 },
		{ 2, 3 },
		{ 0, 1 }
	};

	const uint32_t NUM_ETC1_TO_BC7_M5A_SELECTOR_RANGES = sizeof(g_etc1_to_bc7_m5a_selector_ranges) / sizeof(g_etc1_to_bc7_m5a_selector_ranges[0]);

	static uint32_t g_etc1_to_bc7_m5a_selector_range_index[4][4];

	struct etc1_g_to_bc7_m5a_conversion
	{
		uint8_t m_lo, m_hi;
		uint8_t m_trans;
	};

	static etc1_g_to_bc7_m5a_conversion g_etc1_g_to_bc7_m5a[8 * 32 * NUM_ETC1_TO_BC7_M5A_SELECTOR_RANGES] =
	{
		#include "basisu_transcoder_tables_bc7_m5_alpha.inc"
	};
	
	static inline uint32_t set_block_bits(uint8_t* pBytes, uint32_t val, uint32_t num_bits, uint32_t cur_ofs)
	{
		assert(num_bits < 32);
		assert(val < (1ULL << num_bits));

		uint32_t mask = (1 << num_bits) - 1;

		while (num_bits)
		{
			const uint32_t n = basisu::minimum<uint32_t>(8 - (cur_ofs & 7), num_bits);

			pBytes[cur_ofs >> 3] &= ~static_cast<uint8_t>(mask << (cur_ofs & 7));
			pBytes[cur_ofs >> 3] |= static_cast<uint8_t>(val << (cur_ofs & 7));

			val >>= n;
			mask >>= n;

			num_bits -= n;
			cur_ofs += n;
		}

		return cur_ofs;
	}

	struct bc7_mode_5
	{
		union
		{
			struct
			{
				uint64_t m_mode : 6;
				uint64_t m_rot : 2;

				uint64_t m_r0 : 7;
				uint64_t m_r1 : 7;
				uint64_t m_g0 : 7;
				uint64_t m_g1 : 7;
				uint64_t m_b0 : 7;
				uint64_t m_b1 : 7;
				uint64_t m_a0 : 8;
				uint64_t m_a1_0 : 6;

			} m_lo;

			uint64_t m_lo_bits;
		};

		union
		{
			struct
			{
				uint64_t m_a1_1 : 2;

				// bit 2
				uint64_t m_c00 : 1;
				uint64_t m_c10 : 2;
				uint64_t m_c20 : 2;
				uint64_t m_c30 : 2;

				uint64_t m_c01 : 2;
				uint64_t m_c11 : 2;
				uint64_t m_c21 : 2;
				uint64_t m_c31 : 2;

				uint64_t m_c02 : 2;
				uint64_t m_c12 : 2;
				uint64_t m_c22 : 2;
				uint64_t m_c32 : 2;

				uint64_t m_c03 : 2;
				uint64_t m_c13 : 2;
				uint64_t m_c23 : 2;
				uint64_t m_c33 : 2;

				// bit 33
				uint64_t m_a00 : 1;
				uint64_t m_a10 : 2;
				uint64_t m_a20 : 2;
				uint64_t m_a30 : 2;

				uint64_t m_a01 : 2;
				uint64_t m_a11 : 2;
				uint64_t m_a21 : 2;
				uint64_t m_a31 : 2;

				uint64_t m_a02 : 2;
				uint64_t m_a12 : 2;
				uint64_t m_a22 : 2;
				uint64_t m_a32 : 2;

				uint64_t m_a03 : 2;
				uint64_t m_a13 : 2;
				uint64_t m_a23 : 2;
				uint64_t m_a33 : 2;

			} m_hi;

			uint64_t m_hi_bits;
		};
	};

#if BASISD_WRITE_NEW_BC7_MODE5_TABLES
	static void create_etc1_to_bc7_m5_color_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_bc7_m5_color.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_bc7_m5_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_bc7_m5_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 127; hi++)
						{
							for (uint32_t lo = 0; lo <= 127; lo++)
							{
								uint32_t colors[4];

								colors[0] = (lo << 1) | (lo >> 6);
								colors[3] = (hi << 1) | (hi >> 6);

								colors[1] = (colors[0] * (64 - 21) + colors[3] * 21 + 32) / 64;
								colors[2] = (colors[0] * (64 - 43) + colors[3] * 43 + 32) / 64;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_bc7_m5_selector_mappings[m][s]];

									int err_scale = 1;
									// Special case when the intensity table is 7, low_selector is 0, and high_selector is 3. In this extreme case, it's likely the encoder is trying to strongly favor 
									// the low/high selectors which are clamping to either 0 or 255.
									if (((inten == 7) && (low_selector == 0) && (high_selector == 3)) && ((s == 0) || (s == 3)))
										err_scale = 5;

									total_err += (err * err) * err_scale;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						best_err = basisu::minimum<uint32_t>(best_err, 0xFFFF);

						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
	}

	static void create_etc1_to_bc7_m5_alpha_conversion_table()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_bc7_m5_alpha.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_BC7_M5A_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_bc7_m5a_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_bc7_m5a_selector_ranges[sr].m_high;

					uint32_t best_lo = 0;
					uint32_t best_hi = 0;
					uint64_t best_err = UINT64_MAX;
					uint32_t best_output_selectors = 0;

					for (uint32_t hi = 0; hi <= 255; hi++)
					{
						for (uint32_t lo = 0; lo <= 255; lo++)
						{
							uint32_t colors[4];

							colors[0] = lo;
							colors[3] = hi;

							colors[1] = (colors[0] * (64 - 21) + colors[3] * 21 + 32) / 64;
							colors[2] = (colors[0] * (64 - 43) + colors[3] * 43 + 32) / 64;

							uint64_t total_err = 0;
							uint32_t output_selectors = 0;

							for (uint32_t s = low_selector; s <= high_selector; s++)
							{
								int best_mapping_err = INT_MAX;
								int best_k = 0;
								for (int k = 0; k < 4; k++)
								{
									int mapping_err = block_colors[s].g - colors[k];
									mapping_err *= mapping_err;

									// Special case when the intensity table is 7, low_selector is 0, and high_selector is 3. In this extreme case, it's likely the encoder is trying to strongly favor 
									// the low/high selectors which are clamping to either 0 or 255.
									if (((inten == 7) && (low_selector == 0) && (high_selector == 3)) && ((s == 0) || (s == 3)))
										mapping_err *= 5;

									if (mapping_err < best_mapping_err)
									{
										best_mapping_err = mapping_err;
										best_k = k;
									}
								} // k
								
								total_err += best_mapping_err;
								output_selectors |= (best_k << (s * 2));
							} // s

							if (total_err < best_err)
							{
								best_err = total_err;
								best_lo = lo;
								best_hi = hi;
								best_output_selectors = output_selectors;
							}

						} // lo
					} // hi
										
					fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, best_output_selectors);
					n++;
					if ((n & 31) == 31)
						fprintf(pFile, "\n");

				} // sr
			} // g
		} // inten

		fclose(pFile);
	}
#endif // BASISD_WRITE_NEW_BC7_MODE5_TABLES

	struct bc7_m5_match_entry
	{
		uint8_t m_hi;
		uint8_t m_lo;
	};

	static bc7_m5_match_entry g_bc7_m5_equals_1[256] =
	{
		{0,0},{1,0},{3,0},{4,0},{6,0},{7,0},{9,0},{10,0},{12,0},{13,0},{15,0},{16,0},{18,0},{20,0},{21,0},{23,0},
		{24,0},{26,0},{27,0},{29,0},{30,0},{32,0},{33,0},{35,0},{36,0},{38,0},{39,0},{41,0},{42,0},{44,0},{45,0},{47,0},
		{48,0},{50,0},{52,0},{53,0},{55,0},{56,0},{58,0},{59,0},{61,0},{62,0},{64,0},{65,0},{66,0},{68,0},{69,0},{71,0},
		{72,0},{74,0},{75,0},{77,0},{78,0},{80,0},{82,0},{83,0},{85,0},{86,0},{88,0},{89,0},{91,0},{92,0},{94,0},{95,0},
		{97,0},{98,0},{100,0},{101,0},{103,0},{104,0},{106,0},{107,0},{109,0},{110,0},{112,0},{114,0},{115,0},{117,0},{118,0},{120,0},
		{121,0},{123,0},{124,0},{126,0},{127,0},{127,1},{126,2},{126,3},{127,3},{127,4},{126,5},{126,6},{127,6},{127,7},{126,8},{126,9},
		{127,9},{127,10},{126,11},{126,12},{127,12},{127,13},{126,14},{125,15},{127,15},{126,16},{126,17},{127,17},{127,18},{126,19},{126,20},{127,20},
		{127,21},{126,22},{126,23},{127,23},{127,24},{126,25},{126,26},{127,26},{127,27},{126,28},{126,29},{127,29},{127,30},{126,31},{126,32},{127,32},
		{127,33},{126,34},{126,35},{127,35},{127,36},{126,37},{126,38},{127,38},{127,39},{126,40},{126,41},{127,41},{127,42},{126,43},{126,44},{127,44},
		{127,45},{126,46},{125,47},{127,47},{126,48},{126,49},{127,49},{127,50},{126,51},{126,52},{127,52},{127,53},{126,54},{126,55},{127,55},{127,56},
		{126,57},{126,58},{127,58},{127,59},{126,60},{126,61},{127,61},{127,62},{126,63},{125,64},{126,64},{126,65},{127,65},{127,66},{126,67},{126,68},
		{127,68},{127,69},{126,70},{126,71},{127,71},{127,72},{126,73},{126,74},{127,74},{127,75},{126,76},{125,77},{127,77},{126,78},{126,79},{127,79},
		{127,80},{126,81},{126,82},{127,82},{127,83},{126,84},{126,85},{127,85},{127,86},{126,87},{126,88},{127,88},{127,89},{126,90},{126,91},{127,91},
		{127,92},{126,93},{126,94},{127,94},{127,95},{126,96},{126,97},{127,97},{127,98},{126,99},{126,100},{127,100},{127,101},{126,102},{126,103},{127,103},
		{127,104},{126,105},{126,106},{127,106},{127,107},{126,108},{125,109},{127,109},{126,110},{126,111},{127,111},{127,112},{126,113},{126,114},{127,114},{127,115},
		{126,116},{126,117},{127,117},{127,118},{126,119},{126,120},{127,120},{127,121},{126,122},{126,123},{127,123},{127,124},{126,125},{126,126},{127,126},{127,127}
	};
	
	static void transcoder_init_bc7_mode5()
	{
#if 0
		// This is a little too much work to do at init time, so precompute it.
		for (int i = 0; i < 256; i++)
		{
			int lowest_e = 256;
			for (int lo = 0; lo < 128; lo++)
			{
				for (int hi = 0; hi < 128; hi++)
				{
					const int lo_e = (lo << 1) | (lo >> 6);
					const int hi_e = (hi << 1) | (hi >> 6);

					// Selector 1
					int v = (lo_e * (64 - 21) + hi_e * 21 + 32) >> 6;
					int e = abs(v - i);

					if (e < lowest_e)
					{
						g_bc7_m5_equals_1[i].m_hi = static_cast<uint8_t>(hi);
						g_bc7_m5_equals_1[i].m_lo = static_cast<uint8_t>(lo);

						lowest_e = e;
					}

				} // hi
								
			} // lo
			
			printf("{%u,%u},", g_bc7_m5_equals_1[i].m_hi, g_bc7_m5_equals_1[i].m_lo);
			if ((i & 15) == 15) printf("\n");
		}
#endif

		for (uint32_t i = 0; i < NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES; i++)
		{
			uint32_t l = g_etc1_to_bc7_m5_selector_ranges[i].m_low;
			uint32_t h = g_etc1_to_bc7_m5_selector_ranges[i].m_high;
			g_etc1_to_bc7_m5_selector_range_index[l][h] = i;
		}

		for (uint32_t i = 0; i < NUM_ETC1_TO_BC7_M5A_SELECTOR_RANGES; i++)
		{
			uint32_t l = g_etc1_to_bc7_m5a_selector_ranges[i].m_low;
			uint32_t h = g_etc1_to_bc7_m5a_selector_ranges[i].m_high;
			g_etc1_to_bc7_m5a_selector_range_index[l][h] = i;
		}
	}

	static void convert_etc1s_to_bc7_m5_color(void* pDst, const endpoint* pEndpoints, const selector* pSelector)
	{
		bc7_mode_5* pDst_block = static_cast<bc7_mode_5*>(pDst);
				
		static_cast<uint64_t*>(pDst)[0] = 0;
		static_cast<uint64_t*>(pDst)[1] = 0;

		pDst_block->m_lo.m_mode = 1 << 5;
		pDst_block->m_lo.m_a0 = 255;
		pDst_block->m_lo.m_a1_0 = 63;
		pDst_block->m_hi.m_a1_1 = 3;

		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		const uint32_t base_color_r = pEndpoints->m_color5.r;
		const uint32_t base_color_g = pEndpoints->m_color5.g;
		const uint32_t base_color_b = pEndpoints->m_color5.b;
		const uint32_t inten_table = pEndpoints->m_inten5;

		if (pSelector->m_num_unique_selectors == 1)
		{
			// Solid color block - use precomputed tables and set selectors to 1.
			uint32_t r, g, b;
			decoder_etc_block::get_block_color5(pEndpoints->m_color5, inten_table, low_selector, r, g, b);

			pDst_block->m_lo.m_r0 = g_bc7_m5_equals_1[r].m_lo;
			pDst_block->m_lo.m_g0 = g_bc7_m5_equals_1[g].m_lo;
			pDst_block->m_lo.m_b0 = g_bc7_m5_equals_1[b].m_lo;

			pDst_block->m_lo.m_r1 = g_bc7_m5_equals_1[r].m_hi;
			pDst_block->m_lo.m_g1 = g_bc7_m5_equals_1[g].m_hi;
			pDst_block->m_lo.m_b1 = g_bc7_m5_equals_1[b].m_hi;

			set_block_bits((uint8_t*)pDst, 0x2aaaaaab, 31, 66);
			return;
		}
		else if (pSelector->m_num_unique_selectors == 2)
		{
			// Only one or two unique selectors, so just switch to block truncation coding (BTC) to avoid quality issues on extreme blocks.
			color32 block_colors[4];

			decoder_etc_block::get_block_colors5(block_colors, color32(base_color_r, base_color_g, base_color_b, 255), inten_table);

			const uint32_t r0 = block_colors[low_selector].r;
			const uint32_t g0 = block_colors[low_selector].g;
			const uint32_t b0 = block_colors[low_selector].b;

			const uint32_t r1 = block_colors[high_selector].r;
			const uint32_t g1 = block_colors[high_selector].g;
			const uint32_t b1 = block_colors[high_selector].b;

			pDst_block->m_lo.m_r0 = r0 >> 1;
			pDst_block->m_lo.m_g0 = g0 >> 1;
			pDst_block->m_lo.m_b0 = b0 >> 1;

			pDst_block->m_lo.m_r1 = r1 >> 1;
			pDst_block->m_lo.m_g1 = g1 >> 1;
			pDst_block->m_lo.m_b1 = b1 >> 1;

			uint32_t output_low_selector = 0, output_bit_offset = 0, output_bits = 0;

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					uint32_t os = (s == low_selector) ? output_low_selector : (3 ^ output_low_selector);

					uint32_t num_bits = 2;

					if ((x | y) == 0)
					{
						if (os & 2)
						{
							pDst_block->m_lo.m_r0 = r1 >> 1;
							pDst_block->m_lo.m_g0 = g1 >> 1;
							pDst_block->m_lo.m_b0 = b1 >> 1;

							pDst_block->m_lo.m_r1 = r0 >> 1;
							pDst_block->m_lo.m_g1 = g0 >> 1;
							pDst_block->m_lo.m_b1 = b0 >> 1;

							output_low_selector = 3;
							os = 0;
						}

						num_bits = 1;
					}

					output_bits |= (os << output_bit_offset);
					output_bit_offset += num_bits;
				}
			}

			set_block_bits((uint8_t*)pDst, output_bits, 31, 66);
			return;
		}

		const uint32_t selector_range_table = g_etc1_to_bc7_m5_selector_range_index[low_selector][high_selector];

		//[32][8][RANGES][MAPPING]
		const etc1_to_bc7_m5_solution* pTable_r = &g_etc1_to_bc7_m5_color[(inten_table * 32 + base_color_r) * (NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS];
		const etc1_to_bc7_m5_solution* pTable_g = &g_etc1_to_bc7_m5_color[(inten_table * 32 + base_color_g) * (NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS];
		const etc1_to_bc7_m5_solution* pTable_b = &g_etc1_to_bc7_m5_color[(inten_table * 32 + base_color_b) * (NUM_ETC1_TO_BC7_M5_SELECTOR_RANGES * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS];

		uint32_t best_err = UINT_MAX;
		uint32_t best_mapping = 0;

		assert(NUM_ETC1_TO_BC7_M5_SELECTOR_MAPPINGS == 10);
#define DO_ITER(m) { uint32_t total_err = pTable_r[m].m_err + pTable_g[m].m_err + pTable_b[m].m_err; if (total_err < best_err) { best_err = total_err; best_mapping = m; } }
		DO_ITER(0); DO_ITER(1); DO_ITER(2); DO_ITER(3); DO_ITER(4);
		DO_ITER(5); DO_ITER(6); DO_ITER(7); DO_ITER(8); DO_ITER(9);
#undef DO_ITER

		const uint8_t* pSelectors_xlat = &g_etc1_to_bc7_m5_selector_mappings[best_mapping][0];

		uint32_t s_inv = 0;
		if (pSelectors_xlat[pSelector->get_selector(0, 0)] & 2)
		{
			pDst_block->m_lo.m_r0 = pTable_r[best_mapping].m_hi;
			pDst_block->m_lo.m_g0 = pTable_g[best_mapping].m_hi;
			pDst_block->m_lo.m_b0 = pTable_b[best_mapping].m_hi;

			pDst_block->m_lo.m_r1 = pTable_r[best_mapping].m_lo;
			pDst_block->m_lo.m_g1 = pTable_g[best_mapping].m_lo;
			pDst_block->m_lo.m_b1 = pTable_b[best_mapping].m_lo;
			
			s_inv = 3;
		}
		else
		{
			pDst_block->m_lo.m_r0 = pTable_r[best_mapping].m_lo;
			pDst_block->m_lo.m_g0 = pTable_g[best_mapping].m_lo;
			pDst_block->m_lo.m_b0 = pTable_b[best_mapping].m_lo;

			pDst_block->m_lo.m_r1 = pTable_r[best_mapping].m_hi;
			pDst_block->m_lo.m_g1 = pTable_g[best_mapping].m_hi;
			pDst_block->m_lo.m_b1 = pTable_b[best_mapping].m_hi;
		}

		uint32_t output_bits = 0, output_bit_ofs = 0;

		for (uint32_t y = 0; y < 4; y++)
		{
			for (uint32_t x = 0; x < 4; x++)
			{
				const uint32_t s = pSelector->get_selector(x, y);
				
				const uint32_t os = pSelectors_xlat[s] ^ s_inv;

				output_bits |= (os << output_bit_ofs);

				output_bit_ofs += (((x | y) == 0) ? 1 : 2);
			}
		}

		set_block_bits((uint8_t*)pDst, output_bits, 31, 66);
	}

	static void convert_etc1s_to_bc7_m5_alpha(void* pDst, const endpoint* pEndpoints, const selector* pSelector)
	{
		bc7_mode_5* pDst_block = static_cast<bc7_mode_5*>(pDst);

		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		const uint32_t base_color_r = pEndpoints->m_color5.r;
		const uint32_t inten_table = pEndpoints->m_inten5;

		if (pSelector->m_num_unique_selectors == 1)
		{
			uint32_t r;
			decoder_etc_block::get_block_color5_r(pEndpoints->m_color5, inten_table, low_selector, r);

			pDst_block->m_lo.m_a0 = r;
			pDst_block->m_lo.m_a1_0 = r & 63;
			pDst_block->m_hi.m_a1_1 = r >> 6;
					  
			return;
		}
		else if (pSelector->m_num_unique_selectors == 2)
		{
			// Only one or two unique selectors, so just switch to block truncation coding (BTC) to avoid quality issues on extreme blocks.
			int block_colors[4];

			decoder_etc_block::get_block_colors5_g(block_colors, pEndpoints->m_color5, inten_table);

			pDst_block->m_lo.m_a0 = block_colors[low_selector];
			pDst_block->m_lo.m_a1_0 = block_colors[high_selector] & 63;
			pDst_block->m_hi.m_a1_1 = block_colors[high_selector] >> 6;

			uint32_t output_low_selector = 0, output_bit_offset = 0, output_bits = 0;

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					const uint32_t s = pSelector->get_selector(x, y);
					uint32_t os = (s == low_selector) ? output_low_selector : (3 ^ output_low_selector);

					uint32_t num_bits = 2;

					if ((x | y) == 0)
					{
						if (os & 2)
						{
							pDst_block->m_lo.m_a0 = block_colors[high_selector];
							pDst_block->m_lo.m_a1_0 = block_colors[low_selector] & 63;
							pDst_block->m_hi.m_a1_1 = block_colors[low_selector] >> 6;

							output_low_selector = 3;
							os = 0;
						}

						num_bits = 1;
					}

					output_bits |= (os << output_bit_offset);
					output_bit_offset += num_bits;
				}
			}

			set_block_bits((uint8_t*)pDst, output_bits, 31, 97);
			return;
		}

		const uint32_t selector_range_table = g_etc1_to_bc7_m5a_selector_range_index[low_selector][high_selector];
						
		const etc1_g_to_bc7_m5a_conversion* pTable = &g_etc1_g_to_bc7_m5a[inten_table * (32 * NUM_ETC1_TO_BC7_M5A_SELECTOR_RANGES) + base_color_r * NUM_ETC1_TO_BC7_M5A_SELECTOR_RANGES + selector_range_table];

		pDst_block->m_lo.m_a0 = pTable->m_lo;
		pDst_block->m_lo.m_a1_0 = pTable->m_hi & 63;
		pDst_block->m_hi.m_a1_1 = pTable->m_hi >> 6;

		uint32_t output_bit_offset = 0, output_bits = 0, selector_trans = pTable->m_trans;

		for (uint32_t y = 0; y < 4; y++)
		{
			for (uint32_t x = 0; x < 4; x++)
			{
				const uint32_t s = pSelector->get_selector(x, y);
				uint32_t os = (selector_trans >> (s * 2)) & 3;

				uint32_t num_bits = 2;

				if ((x | y) == 0)
				{
					if (os & 2)
					{
						pDst_block->m_lo.m_a0 = pTable->m_hi;
						pDst_block->m_lo.m_a1_0 = pTable->m_lo & 63;
						pDst_block->m_hi.m_a1_1 = pTable->m_lo >> 6;

						selector_trans ^= 0xFF;
						os ^= 3;
					}

					num_bits = 1;
				}

				output_bits |= (os << output_bit_offset);
				output_bit_offset += num_bits;
			}
		}

		set_block_bits((uint8_t*)pDst, output_bits, 31, 97);
	}
#endif // BASISD_SUPPORT_BC7_MODE5
	
#if BASISD_SUPPORT_ETC2_EAC_A8
	static void convert_etc1s_to_etc2_eac_a8(eac_a8_block* pDst_block, const endpoint* pEndpoints, const selector* pSelector)
	{
		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		const color32& base_color = pEndpoints->m_color5;
		const uint32_t inten_table = pEndpoints->m_inten5;

		if (low_selector == high_selector)
		{
			uint32_t r;
			decoder_etc_block::get_block_color5_r(base_color, inten_table, low_selector, r);

			// Constant alpha block
			// Select table 13, use selector 4 (0), set multiplier to 1 and base color g
			pDst_block->m_base = r;
			pDst_block->m_table = 13;
			pDst_block->m_multiplier = 1;

			// selectors are all 4's
			static const uint8_t s_etc2_eac_a8_sel4[6] = { 0x92, 0x49, 0x24, 0x92, 0x49, 0x24 };
			memcpy(pDst_block->m_selectors, s_etc2_eac_a8_sel4, sizeof(s_etc2_eac_a8_sel4));

			return;
		}

		uint32_t selector_range_table = 0;
		for (selector_range_table = 0; selector_range_table < NUM_ETC2_EAC_A8_SELECTOR_RANGES; selector_range_table++)
			if ((low_selector == s_etc2_eac_a8_selector_ranges[selector_range_table].m_low) && (high_selector == s_etc2_eac_a8_selector_ranges[selector_range_table].m_high))
				break;
		if (selector_range_table >= NUM_ETC2_EAC_A8_SELECTOR_RANGES)
			selector_range_table = 0;

		const etc1_g_to_etc2_a8_conversion* pTable_entry = &s_etc1_g_to_etc2_a8[base_color.r + inten_table * 32][selector_range_table];

		pDst_block->m_base = pTable_entry->m_base;
		pDst_block->m_table = pTable_entry->m_table_mul >> 4;
		pDst_block->m_multiplier = pTable_entry->m_table_mul & 15;

		uint64_t selector_bits = 0;

		for (uint32_t y = 0; y < 4; y++)
		{
			for (uint32_t x = 0; x < 4; x++)
			{
				uint32_t s = pSelector->get_selector(x, y);

				uint32_t ds = (pTable_entry->m_trans >> (s * 3)) & 7;

				const uint32_t dst_ofs = 45 - (y + x * 4) * 3;
				selector_bits |= (static_cast<uint64_t>(ds) << dst_ofs);
			}
		}

		pDst_block->set_selector_bits(selector_bits);
	}
#endif // BASISD_SUPPORT_ETC2_EAC_A8

// ASTC
	struct etc1_to_astc_solution
	{
		uint8_t m_lo;
		uint8_t m_hi;
		uint16_t m_err;
	};

#if BASISD_SUPPORT_ASTC
	static dxt_selector_range g_etc1_to_astc_selector_ranges[] =
	{
		{ 0, 3 },

		{ 1, 3 },
		{ 0, 2 },

		{ 1, 2 },

		{ 2, 3 },
		{ 0, 1 },
	};

	const uint32_t NUM_ETC1_TO_ASTC_SELECTOR_RANGES = sizeof(g_etc1_to_astc_selector_ranges) / sizeof(g_etc1_to_astc_selector_ranges[0]);

	static uint32_t g_etc1_to_astc_selector_range_index[4][4];

	const uint32_t NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS = 10;
	static const uint8_t g_etc1_to_astc_selector_mappings[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS][4] =
	{
		{ 0, 0, 1, 1 },
		{ 0, 0, 1, 2 },
		{ 0, 0, 1, 3 },
		{ 0, 0, 2, 3 },
		{ 0, 1, 1, 1 },
		{ 0, 1, 2, 2 },
		{ 0, 1, 2, 3 },
		{ 0, 2, 3, 3 },
		{ 1, 2, 2, 2 },
		{ 1, 2, 3, 3 },
	};

	static const etc1_to_astc_solution g_etc1_to_astc[32 * 8 * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS * NUM_ETC1_TO_ASTC_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_astc.inc"
	};

	// The best selector mapping to use given a base base+inten table and used selector range for converting grayscale data.
	static uint8_t g_etc1_to_astc_best_grayscale_mapping[32][8][NUM_ETC1_TO_ASTC_SELECTOR_RANGES];
	
#if BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY
	static const etc1_to_astc_solution g_etc1_to_astc_0_255[32 * 8 * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS * NUM_ETC1_TO_ASTC_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_astc_0_255.inc"
	};
	static uint8_t g_etc1_to_astc_best_grayscale_mapping_0_255[32][8][NUM_ETC1_TO_ASTC_SELECTOR_RANGES];
#endif

	static uint32_t g_ise_to_unquant[48];

#if BASISD_WRITE_NEW_ASTC_TABLES
	static void create_etc1_to_astc_conversion_table_0_47()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_astc.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_ASTC_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_astc_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_astc_selector_ranges[sr].m_high;

					uint32_t mapping_best_low[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
					uint32_t mapping_best_high[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
					uint64_t mapping_best_err[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
					uint64_t highest_best_err = 0;

					for (uint32_t m = 0; m < NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 47; hi++)
						{
							for (uint32_t lo = 0; lo <= 47; lo++)
							{
								uint32_t colors[4];

								for (uint32_t s = 0; s < 4; s++)
								{
									uint32_t s_scaled = s | (s << 2) | (s << 4);
									if (s_scaled > 32)
										s_scaled++;

									uint32_t c0 = g_ise_to_unquant[lo] | (g_ise_to_unquant[lo] << 8);
									uint32_t c1 = g_ise_to_unquant[hi] | (g_ise_to_unquant[hi] << 8);
									colors[s] = ((c0 * (64 - s_scaled) + c1 * s_scaled + 32) / 64) >> 8;
								}

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_astc_selector_mappings[m][s]];

									int err_scale = 1;
									// Special case when the intensity table is 7, low_selector is 0, and high_selector is 3. In this extreme case, it's likely the encoder is trying to strongly favor 
									// the low/high selectors which are clamping to either 0 or 255.
									if (((inten == 7) && (low_selector == 0) && (high_selector == 3)) && ((s == 0) || (s == 3)))
										err_scale = 8;

									total_err += (err * err) * err_scale;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						mapping_best_low[m] = best_lo;
						mapping_best_high[m] = best_hi;
						mapping_best_err[m] = best_err;
						highest_best_err = basisu::maximum(highest_best_err, best_err);
												
					} // m

					for (uint32_t m = 0; m < NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS; m++)
					{
						uint64_t err = mapping_best_err[m];

						err = basisu::minimum<uint64_t>(err, 0xFFFF);

						fprintf(pFile, "{%u,%u,%u},", mapping_best_low[m], mapping_best_high[m], (uint32_t)err);

						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m

				} // sr
			} // g
		} // inten

		fclose(pFile);
	}

	static void create_etc1_to_astc_conversion_table_0_255()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_astc_0_255.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1_TO_ASTC_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1_to_astc_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1_to_astc_selector_ranges[sr].m_high;

					uint32_t mapping_best_low[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
					uint32_t mapping_best_high[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
					uint64_t mapping_best_err[NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
					uint64_t highest_best_err = 0;

					for (uint32_t m = 0; m < NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 255; hi++)
						{
							for (uint32_t lo = 0; lo <= 255; lo++)
							{
								uint32_t colors[4];

								for (uint32_t s = 0; s < 4; s++)
								{
									uint32_t s_scaled = s | (s << 2) | (s << 4);
									if (s_scaled > 32)
										s_scaled++;

									uint32_t c0 = lo | (lo << 8);
									uint32_t c1 = hi | (hi << 8);
									colors[s] = ((c0 * (64 - s_scaled) + c1 * s_scaled + 32) / 64) >> 8;
								}

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1_to_astc_selector_mappings[m][s]];

									// Special case when the intensity table is 7, low_selector is 0, and high_selector is 3. In this extreme case, it's likely the encoder is trying to strongly favor 
									// the low/high selectors which are clamping to either 0 or 255.
									int err_scale = 1;
									if (((inten == 7) && (low_selector == 0) && (high_selector == 3)) && ((s == 0) || (s == 3)))
										err_scale = 8;

									total_err += (err * err) * err_scale;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						mapping_best_low[m] = best_lo;
						mapping_best_high[m] = best_hi;
						mapping_best_err[m] = best_err;
						highest_best_err = basisu::maximum(highest_best_err, best_err);
					} // m

					for (uint32_t m = 0; m < NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS; m++)
					{
						uint64_t err = mapping_best_err[m];

						err = basisu::minimum<uint64_t>(err, 0xFFFF);
						
						fprintf(pFile, "{%u,%u,%u},", mapping_best_low[m], mapping_best_high[m], (uint32_t)err);
						
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m

				} // sr
			} // g
		} // inten

		fclose(pFile);
	}
#endif

#endif

#if BASISD_SUPPORT_ASTC
	struct astc_block_params
	{
		// 2 groups of 5, but only a max of 8 are used (RRGGBBAA00)
		uint8_t m_endpoints[10]; 
		uint8_t m_weights[32];
	};
		
	// Table encodes 5 trits to 8 output bits. 3^5 entries.
	// Inverse of the trit bit manipulation process in https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#astc-integer-sequence-encoding
	static const uint8_t g_astc_trit_encode[243] = { 0, 1, 2, 4, 5, 6, 8, 9, 10, 16, 17, 18, 20, 21, 22, 24, 25, 26, 3, 7, 11, 19, 23, 27, 12, 13, 14, 32, 33, 34, 36, 37, 38, 40, 41, 42, 48, 49, 50, 52, 53, 54, 56, 57, 58, 35, 39, 
		43, 51, 55, 59, 44, 45, 46, 64, 65, 66, 68, 69, 70, 72, 73, 74, 80, 81, 82, 84, 85, 86, 88, 89, 90, 67, 71, 75, 83, 87, 91, 76, 77, 78, 128, 129, 130, 132, 133, 134, 136, 137, 138, 144, 145, 146, 148, 149, 150, 152, 153, 154, 
		131, 135, 139, 147, 151, 155, 140, 141, 142, 160, 161, 162, 164, 165, 166, 168, 169, 170, 176, 177, 178, 180, 181, 182, 184, 185, 186, 163, 167, 171, 179, 183, 187, 172, 173, 174, 192, 193, 194, 196, 197, 198, 200, 201, 202, 
		208, 209, 210, 212, 213, 214, 216, 217, 218, 195, 199, 203, 211, 215, 219, 204, 205, 206, 96, 97, 98, 100, 101, 102, 104, 105, 106, 112, 113, 114, 116, 117, 118, 120, 121, 122, 99, 103, 107, 115, 119, 123, 108, 109, 110, 224, 
		225, 226, 228, 229, 230, 232, 233, 234, 240, 241, 242, 244, 245, 246, 248, 249, 250, 227, 231, 235, 243, 247, 251, 236, 237, 238, 28, 29, 30, 60, 61, 62, 92, 93, 94, 156, 157, 158, 188, 189, 190, 220, 221, 222, 31, 63, 95, 159, 
		191, 223, 124, 125, 126 };

	// Writes bits to output in an endian safe way
	static inline void astc_set_bits(uint32_t *pOutput, int &bit_pos, uint32_t value, int total_bits)
	{
		uint8_t* pBytes = reinterpret_cast<uint8_t*>(pOutput);
		
		while (total_bits)
		{
			const uint32_t bits_to_write = std::min(total_bits, 8 - (bit_pos & 7));

			pBytes[bit_pos >> 3] |= static_cast<uint8_t>(value << (bit_pos & 7));

			bit_pos += bits_to_write;
			total_bits -= bits_to_write;
			value >>= bits_to_write;
		}
	}

	// Extracts bits [low,high]
	static inline uint32_t astc_extract_bits(uint32_t bits, int low, int high)
	{
		return (bits >> low) & ((1 << (high - low + 1)) - 1);
	}

	// Encodes 5 values to output, usable for any range that uses trits and bits
	static void astc_encode_trits(uint32_t *pOutput, const uint8_t *pValues, int& bit_pos, int n)
	{
		// First extract the trits and the bits from the 5 input values
		int trits = 0, bits[5];
		const uint32_t bit_mask = (1 << n) - 1;
		for (int i = 0; i < 5; i++)
		{
			static const int s_muls[5] = { 1, 3, 9, 27, 81 };
			
			const int t = pValues[i] >> n;
			
			trits += t * s_muls[i];
			bits[i] = pValues[i] & bit_mask;
		}

		// Encode the trits, by inverting the bit manipulations done by the decoder, converting 5 trits into 8-bits.
		// See https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#astc-integer-sequence-encoding

		assert(trits < 243);
		const int T = g_astc_trit_encode[trits];
		
		// Now interleave the 8 encoded trit bits with the bits to form the encoded output. See table 94.
		astc_set_bits(pOutput, bit_pos, bits[0] | (astc_extract_bits(T, 0, 1) << n) | (bits[1] << (2 + n)), n * 2 + 2);

		astc_set_bits(pOutput, bit_pos, astc_extract_bits(T, 2, 3) | (bits[2] << 2) | (astc_extract_bits(T, 4, 4) << (2 + n)) | (bits[3] << (3 + n)) | (astc_extract_bits(T, 5, 6) << (3 + n * 2)) | 
			(bits[4] << (5 + n * 2)) | (astc_extract_bits(T, 7, 7) << (5 + n * 3)), n * 3 + 6);
	}

	// Packs a single format ASTC block using Color Endpoint Mode 12 (LDR RGBA direct), endpoint BISE range 13, 2-bit weights (range 2). 
	// We're always going to output blocks containing alpha, even if the input doesn't have alpha, for simplicity.
	// Each block always has 4x4 weights, uses range 13 BISE encoding on the endpoints (0-47), and each weight ranges from 0-3. This encoding should be roughly equal in quality vs. BC1 for color.
	// 8 total endpoints, stored as RGBA LH LH LH LH order, each ranging from 0-47. 
	// Note the input [0,47] endpoint values are not linear - they are encoded as outlined in the ASTC spec:
	// https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#astc-endpoint-unquantization
	// 32 total weights, stored as 16 CA CA, each ranging from 0-3.
	static void astc_pack_block_cem_12_weight_range2(uint32_t *pOutput, const astc_block_params* pBlock)
	{
		uint8_t* pBytes = reinterpret_cast<uint8_t*>(pOutput);

		// Write constant block mode, color component selector, number of partitions, color endpoint mode
		// https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#_block_mode
		pBytes[0] = 0x42; pBytes[1] = 0x84; pBytes[2] = 0x01; pBytes[3] = 0x00;
		pBytes[4] = 0x00; pBytes[5] = 0x00; pBytes[6] = 0x00; pBytes[7] = 0xc0;

		pOutput[2] = 0;
		pOutput[3] = 0;

		// Pack 8 endpoints (each ranging between [0,47]) using BISE starting at bit 17
		int bit_pos = 17;
		astc_encode_trits(pOutput, pBlock->m_endpoints, bit_pos, 4);
		astc_encode_trits(pOutput, pBlock->m_endpoints + 5, bit_pos, 4);

		// Pack 32 2-bit weights, which are stored from the top down into the block in opposite bit order.
				
		for (uint32_t i = 0; i < 32; i++)
		{
			static const uint8_t s_reverse_bits[4] = { 0, 2, 1, 3 };
			const uint32_t ofs = 126 - (i * 2);
			pBytes[ofs >> 3] |= (s_reverse_bits[pBlock->m_weights[i]] << (ofs & 7));
		}
	}

	// CEM mode 12 (LDR RGBA Direct), 8-bit endpoints, 1-bit weights 
	// This ASTC mode is basically block truncation coding (BTC) using 1-bit weights and 8-bit/component endpoints - very convenient.
	static void astc_pack_block_cem_12_weight_range0(uint32_t* pOutput, const astc_block_params* pBlock)
	{
		uint8_t* pBytes = reinterpret_cast<uint8_t*>(pOutput);

		// Write constant block mode, color component selector, number of partitions, color endpoint mode
		// https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#_block_mode
		pBytes[0] = 0x41; pBytes[1] = 0x84; pBytes[2] = 0x01; pBytes[3] = 0x00;
		pOutput[1] = 0;
		pBytes[8] = 0x00; pBytes[9] = 0x00; pBytes[10] = 0x00; pBytes[11] = 0xc0;
		pOutput[3] = 0;

		// Pack 8 endpoints (each ranging between [0,255]) as 8-bits starting at bit 17
		int bit_pos = 17;
		for (uint32_t i = 0; i < 8; i++)
			astc_set_bits(pOutput, bit_pos, pBlock->m_endpoints[i], 8);

		// Pack 32 1-bit weights, which are stored from the top down into the block in opposite bit order.
		for (uint32_t i = 0; i < 32; i++)
		{
			const uint32_t ofs = 127 - i;
			pBytes[ofs >> 3] |= (pBlock->m_weights[i] << (ofs & 7));
		}
	}

#if BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY
	// Optional 8-bit endpoint packing functions.

	// CEM mode 4 (LDR Luminance+Alpha Direct), 8-bit endpoints, 2 bit weights
	static void astc_pack_block_cem_4_weight_range2(uint32_t* pOutput, const astc_block_params* pBlock)
	{
		uint8_t* pBytes = reinterpret_cast<uint8_t*>(pOutput);

		// Write constant block mode, color component selector, number of partitions, color endpoint mode
		// https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#_block_mode
		pBytes[0] = 0x42; pBytes[1] = 0x84; pBytes[2] = 0x00; pBytes[3] = 0x00;
		pBytes[4] = 0x00; pBytes[5] = 0x00; pBytes[6] = 0x00; pBytes[7] = 0xc0;
		
		pOutput[2] = 0;
		pOutput[3] = 0;

		// Pack 4 endpoints (each ranging between [0,255]) as 8-bits starting at bit 17
		int bit_pos = 17;
		for (uint32_t i = 0; i < 4; i++)
			astc_set_bits(pOutput, bit_pos, pBlock->m_endpoints[i], 8);

		// Pack 32 2-bit weights, which are stored from the top down into the block in opposite bit order.
		for (uint32_t i = 0; i < 32; i++)
		{
			static const uint8_t s_reverse_bits[4] = { 0, 2, 1, 3 };
			const uint32_t ofs = 126 - (i * 2);
			pBytes[ofs >> 3] |= (s_reverse_bits[pBlock->m_weights[i]] << (ofs & 7));
		}
	}

	// CEM mode 8 (LDR RGB Direct), 8-bit endpoints, 2 bit weights
	static void astc_pack_block_cem_8_weight_range2(uint32_t* pOutput, const astc_block_params* pBlock)
	{
		uint8_t* pBytes = reinterpret_cast<uint8_t*>(pOutput);

		// Write constant block mode, color component selector, number of partitions, color endpoint mode
		// https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#_block_mode
		pBytes[0] = 0x42; pBytes[1] = 0x00; pBytes[2] = 0x01; pBytes[3] = 0x00;
		
		pOutput[1] = 0;
		pOutput[2] = 0;
		pOutput[3] = 0;

		// Pack 6 endpoints (each ranging between [0,255]) as 8-bits starting at bit 17
		int bit_pos = 17;
		for (uint32_t i = 0; i < 6; i++)
			astc_set_bits(pOutput, bit_pos, pBlock->m_endpoints[i], 8);

		// Pack 16 2-bit weights, which are stored from the top down into the block in opposite bit order.
		for (uint32_t i = 0; i < 16; i++)
		{
			static const uint8_t s_reverse_bits[4] = { 0, 2, 1, 3 };
			const uint32_t ofs = 126 - (i * 2);
			pBytes[ofs >> 3] |= (s_reverse_bits[pBlock->m_weights[i]] << (ofs & 7));
		}
	}
#endif

	// Optimal quantized [0,47] entry to use given [0,255] input
	static uint8_t g_astc_single_color_encoding_0[256];

	// Optimal quantized [0,47] low/high values given [0,255] input assuming a selector of 1
	static struct
	{
		uint8_t m_lo, m_hi;
	} g_astc_single_color_encoding_1[256];
		
	static void transcoder_init_astc()
	{
		for (uint32_t base_color = 0; base_color < 32; base_color++)
		{
			for (uint32_t inten_table = 0; inten_table < 8; inten_table++)
			{
				for (uint32_t range_index = 0; range_index < NUM_ETC1_TO_ASTC_SELECTOR_RANGES; range_index++)
				{
					const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc[(inten_table * 32 + base_color) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + range_index * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];

					uint32_t best_mapping = 0;
					uint32_t best_err = UINT32_MAX;
					for (uint32_t mapping_index = 0; mapping_index < NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS; mapping_index++)
					{
						if (pTable_g[mapping_index].m_err < best_err)
						{
							best_err = pTable_g[mapping_index].m_err;
							best_mapping = mapping_index;
						}
					}

					g_etc1_to_astc_best_grayscale_mapping[base_color][inten_table][range_index] = static_cast<uint8_t>(best_mapping);
				}
			}
		}

#if BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY
		for (uint32_t base_color = 0; base_color < 32; base_color++)
		{
			for (uint32_t inten_table = 0; inten_table < 8; inten_table++)
			{
				for (uint32_t range_index = 0; range_index < NUM_ETC1_TO_ASTC_SELECTOR_RANGES; range_index++)
				{
					const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc_0_255[(inten_table * 32 + base_color) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + range_index * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];

					uint32_t best_mapping = 0;
					uint32_t best_err = UINT32_MAX;
					for (uint32_t mapping_index = 0; mapping_index < NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS; mapping_index++)
					{
						if (pTable_g[mapping_index].m_err < best_err)
						{
							best_err = pTable_g[mapping_index].m_err;
							best_mapping = mapping_index;
						}
					}

					g_etc1_to_astc_best_grayscale_mapping_0_255[base_color][inten_table][range_index] = static_cast<uint8_t>(best_mapping);
				}
			}
		}
#endif

		for (uint32_t i = 0; i < NUM_ETC1_TO_ASTC_SELECTOR_RANGES; i++)
		{
			uint32_t l = g_etc1_to_astc_selector_ranges[i].m_low;
			uint32_t h = g_etc1_to_astc_selector_ranges[i].m_high;
			g_etc1_to_astc_selector_range_index[l][h] = i;
		}

		// Endpoint dequantization, see:
		// https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#astc-endpoint-unquantization
		for (uint32_t trit = 0; trit < 3; trit++)
		{
			for (uint32_t bit = 0; bit < 16; bit++)
			{
				const uint32_t A = (bit & 1) ? 511 : 0;
				const uint32_t B = (bit >> 1) | ((bit >> 1) << 6);
				const uint32_t C = 22;
				const uint32_t D = trit;

				uint32_t unq = D * C + B;
				unq = unq ^ A;
				unq = (A & 0x80) | (unq >> 2);

				g_ise_to_unquant[bit | (trit << 4)] = unq;
			}
		}
				
		// Compute table used for optimal single color encoding.
		for (int i = 0; i < 256; i++)
		{
			int lowest_e = INT_MAX;

			for (int lo = 0; lo < 48; lo++)
			{
				for (int hi = 0; hi < 48; hi++)
				{
					const int lo_v = g_ise_to_unquant[lo];
					const int hi_v = g_ise_to_unquant[hi];

					int l = lo_v | (lo_v << 8);
					int h = hi_v | (hi_v << 8);
										
					int v = ((l * (64 - 21) + (h * 21) + 32) / 64) >> 8;
					
					int e = abs(v - i);

					if (e < lowest_e)
					{
						g_astc_single_color_encoding_1[i].m_hi = static_cast<uint8_t>(hi);
						g_astc_single_color_encoding_1[i].m_lo = static_cast<uint8_t>(lo);

						lowest_e = e;
					}

				} // hi
			} // lo
		}

		for (int i = 0; i < 256; i++)
		{
			int lowest_e = INT_MAX;

			for (int lo = 0; lo < 48; lo++)
			{
				const int lo_v = g_ise_to_unquant[lo];
				
				int e = abs(lo_v - i);

				if (e < lowest_e)
				{
					g_astc_single_color_encoding_0[i] = static_cast<uint8_t>(lo);

					lowest_e = e;
				}
			} // lo
		}
	}

	// Converts opaque or color+alpha ETC1S block to ASTC 4x4.
	// This function tries to use the best ASTC mode given the block's actual contents.
	static void convert_etc1s_to_astc_4x4(void* pDst_block, const endpoint* pEndpoints, const selector* pSelector, 
		bool transcode_alpha, const endpoint *pEndpoint_codebook, const selector *pSelector_codebook)
	{
		astc_block_params blk;

		blk.m_endpoints[8] = 0;
		blk.m_endpoints[9] = 0;

		int constant_alpha_val = 255;
		int num_unique_alpha_selectors = 1;

		if (transcode_alpha)
		{
			const selector& alpha_selectors = pSelector_codebook[((uint16_t*)pDst_block)[1]];

			num_unique_alpha_selectors = alpha_selectors.m_num_unique_selectors;

			if (num_unique_alpha_selectors == 1)
			{
				const endpoint& alpha_endpoint = pEndpoint_codebook[((uint16_t*)pDst_block)[0]];

				const color32& alpha_base_color = alpha_endpoint.m_color5;
				const uint32_t alpha_inten_table = alpha_endpoint.m_inten5;

				int alpha_block_colors[4];
				decoder_etc_block::get_block_colors5_g(alpha_block_colors, alpha_base_color, alpha_inten_table);

				constant_alpha_val = alpha_block_colors[alpha_selectors.m_lo_selector];
			}
		}

		const color32& base_color = pEndpoints->m_color5;
		const uint32_t inten_table = pEndpoints->m_inten5;

		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		// Handle solid color or BTC blocks, which can always be encoded from ETC1S to ASTC losslessly.
		if ((pSelector->m_num_unique_selectors == 1) && (num_unique_alpha_selectors == 1))
		{
			// Both color and alpha are constant, write a solid color block and exit.
			// See https://www.khronos.org/registry/DataFormat/specs/1.2/dataformat.1.2.html#astc-void-extent-blocks
			uint32_t r, g, b;
			decoder_etc_block::get_block_color5(base_color, inten_table, low_selector, r, g, b);
						
			uint32_t* pOutput = static_cast<uint32_t*>(pDst_block);
			uint8_t* pBytes = reinterpret_cast<uint8_t*>(pDst_block);

			pBytes[0] = 0xfc; pBytes[1] = 0xfd; pBytes[2] = 0xff; pBytes[3] = 0xff;

			pOutput[1] = 0xffffffff;
			pOutput[2] = 0;
			pOutput[3] = 0;

			int bit_pos = 64;
			astc_set_bits(pOutput, bit_pos, r | (r << 8), 16);
			astc_set_bits(pOutput, bit_pos, g | (g << 8), 16);
			astc_set_bits(pOutput, bit_pos, b | (b << 8), 16);
			astc_set_bits(pOutput, bit_pos, constant_alpha_val | (constant_alpha_val << 8), 16);

			return;
		}
		else if ((pSelector->m_num_unique_selectors <= 2) && (num_unique_alpha_selectors <= 2))
		{
			// Both color and alpha use <= 2 unique selectors each. 
			// Use block truncation coding, which is lossless with ASTC (8-bit endpoints, 1-bit weights).
			color32 block_colors[4];
			decoder_etc_block::get_block_colors5(block_colors, base_color, inten_table);

			blk.m_endpoints[0] = block_colors[low_selector].r;
			blk.m_endpoints[2] = block_colors[low_selector].g;
			blk.m_endpoints[4] = block_colors[low_selector].b;

			blk.m_endpoints[1] = block_colors[high_selector].r;
			blk.m_endpoints[3] = block_colors[high_selector].g;
			blk.m_endpoints[5] = block_colors[high_selector].b;

			int s0 = blk.m_endpoints[0] + blk.m_endpoints[2] + blk.m_endpoints[4];
			int s1 = blk.m_endpoints[1] + blk.m_endpoints[3] + blk.m_endpoints[5];
			bool invert = false;
			if (s1 < s0)
			{
				std::swap(blk.m_endpoints[0], blk.m_endpoints[1]);
				std::swap(blk.m_endpoints[2], blk.m_endpoints[3]);
				std::swap(blk.m_endpoints[4], blk.m_endpoints[5]);
				invert = true;
			}

			if (transcode_alpha)
			{
				const endpoint& alpha_endpoint = pEndpoint_codebook[((uint16_t*)pDst_block)[0]];
				const selector& alpha_selectors = pSelector_codebook[((uint16_t*)pDst_block)[1]];

				const color32& alpha_base_color = alpha_endpoint.m_color5;
				const uint32_t alpha_inten_table = alpha_endpoint.m_inten5;

				const uint32_t alpha_low_selector = alpha_selectors.m_lo_selector;
				const uint32_t alpha_high_selector = alpha_selectors.m_hi_selector;

				int alpha_block_colors[4];
				decoder_etc_block::get_block_colors5_g(alpha_block_colors, alpha_base_color, alpha_inten_table);

				blk.m_endpoints[6] = static_cast<uint8_t>(alpha_block_colors[alpha_low_selector]);
				blk.m_endpoints[7] = static_cast<uint8_t>(alpha_block_colors[alpha_high_selector]);

				for (uint32_t y = 0; y < 4; y++)
				{
					for (uint32_t x = 0; x < 4; x++)
					{
						uint32_t s = alpha_selectors.get_selector(x, y);
						s = (s == alpha_high_selector) ? 1 : 0;
												
						blk.m_weights[(x + y * 4) * 2 + 1] = static_cast<uint8_t>(s);
					} // x
				} // y
			}
			else
			{
				blk.m_endpoints[6] = 255;
				blk.m_endpoints[7] = 255;

				for (uint32_t i = 0; i < 16; i++)
					blk.m_weights[i * 2 + 1] = 0;
			}

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);

					s = (s == high_selector) ? 1 : 0;

					if (invert)
						s = 1 - s;

					blk.m_weights[(x + y * 4) * 2] = static_cast<uint8_t>(s);
				} // x
			} // y

			astc_pack_block_cem_12_weight_range0(reinterpret_cast<uint32_t*>(pDst_block), &blk);

			return;
		}
				
		// Either alpha and/or color use > 2 unique selectors each, so we must do something more complex.
				
#if BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY
		// The optional higher quality modes use 8-bits endpoints vs. [0,47] endpoints.
		
		// If the block's base color is grayscale, all pixels are grayscale, so encode the block as Luminance+Alpha.
		if ((base_color.r == base_color.g) && (base_color.r == base_color.b))
		{
			if (transcode_alpha)
			{
				const endpoint& alpha_endpoint = pEndpoint_codebook[((uint16_t*)pDst_block)[0]];
				const selector& alpha_selectors = pSelector_codebook[((uint16_t*)pDst_block)[1]];

				const color32& alpha_base_color = alpha_endpoint.m_color5;
				const uint32_t alpha_inten_table = alpha_endpoint.m_inten5;

				const uint32_t alpha_low_selector = alpha_selectors.m_lo_selector;
				const uint32_t alpha_high_selector = alpha_selectors.m_hi_selector;

				if (num_unique_alpha_selectors <= 2)
				{
					// Simple alpha block with only 1 or 2 unique values, so use BTC. This is lossless.
					int alpha_block_colors[4];
					decoder_etc_block::get_block_colors5_g(alpha_block_colors, alpha_base_color, alpha_inten_table);

					blk.m_endpoints[2] = static_cast<uint8_t>(alpha_block_colors[alpha_low_selector]);
					blk.m_endpoints[3] = static_cast<uint8_t>(alpha_block_colors[alpha_high_selector]);

					for (uint32_t i = 0; i < 16; i++)
					{
						uint32_t s = alpha_selectors.get_selector(i & 3, i >> 2);
						blk.m_weights[i * 2 + 1] = (s == alpha_high_selector) ? 3 : 0;
					}
				}
				else
				{
					// Convert ETC1S alpha
					const uint32_t alpha_selector_range_table = g_etc1_to_astc_selector_range_index[alpha_low_selector][alpha_high_selector];
										
					//[32][8][RANGES][MAPPING]
					const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc_0_255[(alpha_inten_table * 32 + alpha_base_color.g) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + alpha_selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];

					const uint32_t best_mapping = g_etc1_to_astc_best_grayscale_mapping_0_255[alpha_base_color.g][alpha_inten_table][alpha_selector_range_table];

					blk.m_endpoints[2] = pTable_g[best_mapping].m_lo;
					blk.m_endpoints[3] = pTable_g[best_mapping].m_hi;
										
					const uint8_t* pSelectors_xlat = &g_etc1_to_astc_selector_mappings[best_mapping][0];

					for (uint32_t y = 0; y < 4; y++)
					{
						for (uint32_t x = 0; x < 4; x++)
						{
							uint32_t s = alpha_selectors.get_selector(x, y);
							uint32_t as = pSelectors_xlat[s];

							blk.m_weights[(x + y * 4) * 2 + 1] = static_cast<uint8_t>(as);
						} // x
					} // y
				}
			}
			else
			{
				// No alpha slice - set output alpha to all 255's
				blk.m_endpoints[2] = 255;
				blk.m_endpoints[3] = 255;

				for (uint32_t i = 0; i < 16; i++)
					blk.m_weights[i * 2 + 1] = 0;
			}

			if (pSelector->m_num_unique_selectors <= 2)
			{
				// Simple color block with only 1 or 2 unique values, so use BTC. This is lossless.
				int block_colors[4];
				decoder_etc_block::get_block_colors5_g(block_colors, base_color, inten_table);

				blk.m_endpoints[0] = static_cast<uint8_t>(block_colors[low_selector]);
				blk.m_endpoints[1] = static_cast<uint8_t>(block_colors[high_selector]);

				for (uint32_t i = 0; i < 16; i++)
				{
					uint32_t s = pSelector->get_selector(i & 3, i >> 2);
					blk.m_weights[i * 2] = (s == high_selector) ? 3 : 0;
				}
			}
			else
			{
				// Convert ETC1S alpha
				const uint32_t selector_range_table = g_etc1_to_astc_selector_range_index[low_selector][high_selector];
								
				//[32][8][RANGES][MAPPING]
				const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc_0_255[(inten_table * 32 + base_color.g) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
								
				const uint32_t best_mapping = g_etc1_to_astc_best_grayscale_mapping_0_255[base_color.g][inten_table][selector_range_table];

				blk.m_endpoints[0] = pTable_g[best_mapping].m_lo;
				blk.m_endpoints[1] = pTable_g[best_mapping].m_hi;

				const uint8_t* pSelectors_xlat = &g_etc1_to_astc_selector_mappings[best_mapping][0];

				for (uint32_t y = 0; y < 4; y++)
				{
					for (uint32_t x = 0; x < 4; x++)
					{
						uint32_t s = pSelector->get_selector(x, y);
						uint32_t as = pSelectors_xlat[s];

						blk.m_weights[(x + y * 4) * 2] = static_cast<uint8_t>(as);
					} // x
				} // y
			}

			astc_pack_block_cem_4_weight_range2(reinterpret_cast<uint32_t*>(pDst_block), &blk);
			return;
		}

		// The block isn't grayscale and it uses > 2 unique selectors for opaque and/or alpha.
		// Check for fully opaque blocks, if so use 8-bit endpoints for slightly higher opaque quality (higher than BC1, but lower than BC7 mode 6 opaque).
		if ((num_unique_alpha_selectors == 1) && (constant_alpha_val == 255))
		{
			// Convert ETC1S color
			const uint32_t selector_range_table = g_etc1_to_astc_selector_range_index[low_selector][high_selector];

			//[32][8][RANGES][MAPPING]
			const etc1_to_astc_solution* pTable_r = &g_etc1_to_astc_0_255[(inten_table * 32 + base_color.r) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
			const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc_0_255[(inten_table * 32 + base_color.g) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
			const etc1_to_astc_solution* pTable_b = &g_etc1_to_astc_0_255[(inten_table * 32 + base_color.b) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];

			uint32_t best_err = UINT_MAX;
			uint32_t best_mapping = 0;

			assert(NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS == 10);
#define DO_ITER(m) { uint32_t total_err = pTable_r[m].m_err + pTable_g[m].m_err + pTable_b[m].m_err; if (total_err < best_err) { best_err = total_err; best_mapping = m; } }
			DO_ITER(0); DO_ITER(1); DO_ITER(2); DO_ITER(3); DO_ITER(4);
			DO_ITER(5); DO_ITER(6); DO_ITER(7); DO_ITER(8); DO_ITER(9);
#undef DO_ITER

			blk.m_endpoints[0] = pTable_r[best_mapping].m_lo;
			blk.m_endpoints[1] = pTable_r[best_mapping].m_hi;

			blk.m_endpoints[2] = pTable_g[best_mapping].m_lo;
			blk.m_endpoints[3] = pTable_g[best_mapping].m_hi;

			blk.m_endpoints[4] = pTable_b[best_mapping].m_lo;
			blk.m_endpoints[5] = pTable_b[best_mapping].m_hi;

			int s0 = blk.m_endpoints[0] + blk.m_endpoints[2] + blk.m_endpoints[4];
			int s1 = blk.m_endpoints[1] + blk.m_endpoints[3] + blk.m_endpoints[5];
			bool invert = false;

			if (s1 < s0)
			{
				std::swap(blk.m_endpoints[0], blk.m_endpoints[1]);
				std::swap(blk.m_endpoints[2], blk.m_endpoints[3]);
				std::swap(blk.m_endpoints[4], blk.m_endpoints[5]);
				invert = true;
			}

			const uint8_t* pSelectors_xlat = &g_etc1_to_astc_selector_mappings[best_mapping][0];

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					uint32_t as = pSelectors_xlat[s];
					if (invert)
						as = 3 - as;

					blk.m_weights[x + y * 4] = static_cast<uint8_t>(as);
				} // x
			} // y

			// Now pack to ASTC
			astc_pack_block_cem_8_weight_range2(reinterpret_cast<uint32_t*>(pDst_block), &blk);
			return;
		}
#endif //#if BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY

		// Nothing else worked, so fall back to CEM Mode 12 (LDR RGBA Direct), [0,47] endpoints, weight range 2 (2-bit weights), dual planes.
		// This mode can handle everything, but at slightly less quality than BC1.
		if (transcode_alpha)
		{
			const endpoint& alpha_endpoint = pEndpoint_codebook[((uint16_t*)pDst_block)[0]];
			const selector& alpha_selectors = pSelector_codebook[((uint16_t*)pDst_block)[1]];

			const color32& alpha_base_color = alpha_endpoint.m_color5;
			const uint32_t alpha_inten_table = alpha_endpoint.m_inten5;

			const uint32_t alpha_low_selector = alpha_selectors.m_lo_selector;
			const uint32_t alpha_high_selector = alpha_selectors.m_hi_selector;

			if (alpha_low_selector == alpha_high_selector)
			{
				// Solid alpha block - use precomputed tables.
				int alpha_block_colors[4];
				decoder_etc_block::get_block_colors5_g(alpha_block_colors, alpha_base_color, alpha_inten_table);

				const uint32_t g = alpha_block_colors[alpha_low_selector];

				blk.m_endpoints[6] = g_astc_single_color_encoding_1[g].m_lo;
				blk.m_endpoints[7] = g_astc_single_color_encoding_1[g].m_hi;

				for (uint32_t i = 0; i < 16; i++)
					blk.m_weights[i * 2 + 1] = 1;
			}
			else if ((alpha_inten_table >= 7) && (alpha_selectors.m_num_unique_selectors == 2) && (alpha_low_selector == 0) && (alpha_high_selector == 3))
			{
				// Handle outlier case where only the two outer colors are used with inten table 7.
				color32 alpha_block_colors[4];

				decoder_etc_block::get_block_colors5(alpha_block_colors, alpha_base_color, alpha_inten_table);

				const uint32_t g0 = alpha_block_colors[0].g;
				const uint32_t g1 = alpha_block_colors[3].g;

				blk.m_endpoints[6] = g_astc_single_color_encoding_0[g0];
				blk.m_endpoints[7] = g_astc_single_color_encoding_0[g1];

				for (uint32_t y = 0; y < 4; y++)
				{
					for (uint32_t x = 0; x < 4; x++)
					{
						uint32_t s = alpha_selectors.get_selector(x, y);
						uint32_t as = (s == alpha_high_selector) ? 3 : 0;

						blk.m_weights[(x + y * 4) * 2 + 1] = static_cast<uint8_t>(as);
					} // x
				} // y
			}
			else
			{
				// Convert ETC1S alpha
				const uint32_t alpha_selector_range_table = g_etc1_to_astc_selector_range_index[alpha_low_selector][alpha_high_selector];
								
				//[32][8][RANGES][MAPPING]
				const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc[(alpha_inten_table * 32 + alpha_base_color.g) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + alpha_selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];

				const uint32_t best_mapping = g_etc1_to_astc_best_grayscale_mapping[alpha_base_color.g][alpha_inten_table][alpha_selector_range_table];

				blk.m_endpoints[6] = pTable_g[best_mapping].m_lo;
				blk.m_endpoints[7] = pTable_g[best_mapping].m_hi;

				const uint8_t* pSelectors_xlat = &g_etc1_to_astc_selector_mappings[best_mapping][0];

				for (uint32_t y = 0; y < 4; y++)
				{
					for (uint32_t x = 0; x < 4; x++)
					{
						uint32_t s = alpha_selectors.get_selector(x, y);
						uint32_t as = pSelectors_xlat[s];

						blk.m_weights[(x + y * 4) * 2 + 1] = static_cast<uint8_t>(as);
					} // x
				} // y
			}
		}
		else
		{
			// No alpha slice - set output alpha to all 255's
			// 1 is 255 when dequantized
			blk.m_endpoints[6] = 1;
			blk.m_endpoints[7] = 1;

			for (uint32_t i = 0; i < 16; i++)
				blk.m_weights[i * 2 + 1] = 0;
		}

		if (low_selector == high_selector)
		{
			// Solid color block - use precomputed tables of optimal endpoints assuming selector weights are all 1.
			color32 block_colors[4];

			decoder_etc_block::get_block_colors5(block_colors, base_color, inten_table);

			const uint32_t r = block_colors[low_selector].r;
			const uint32_t g = block_colors[low_selector].g;
			const uint32_t b = block_colors[low_selector].b;
						
			blk.m_endpoints[0] = g_astc_single_color_encoding_1[r].m_lo;
			blk.m_endpoints[1] = g_astc_single_color_encoding_1[r].m_hi;

			blk.m_endpoints[2] = g_astc_single_color_encoding_1[g].m_lo;
			blk.m_endpoints[3] = g_astc_single_color_encoding_1[g].m_hi;

			blk.m_endpoints[4] = g_astc_single_color_encoding_1[b].m_lo;
			blk.m_endpoints[5] = g_astc_single_color_encoding_1[b].m_hi;

			int s0 = g_ise_to_unquant[blk.m_endpoints[0]] + g_ise_to_unquant[blk.m_endpoints[2]] + g_ise_to_unquant[blk.m_endpoints[4]];
			int s1 = g_ise_to_unquant[blk.m_endpoints[1]] + g_ise_to_unquant[blk.m_endpoints[3]] + g_ise_to_unquant[blk.m_endpoints[5]];
			bool invert = false;

			if (s1 < s0)
			{
				std::swap(blk.m_endpoints[0], blk.m_endpoints[1]);
				std::swap(blk.m_endpoints[2], blk.m_endpoints[3]);
				std::swap(blk.m_endpoints[4], blk.m_endpoints[5]);
				invert = true;
			}

			for (uint32_t i = 0; i < 16; i++)
				blk.m_weights[i * 2] = invert ? 2 : 1;
		}
		else if ((inten_table >= 7) && (pSelector->m_num_unique_selectors == 2) && (pSelector->m_lo_selector == 0) && (pSelector->m_hi_selector == 3))
		{
			// Handle outlier case where only the two outer colors are used with inten table 7.
			color32 block_colors[4];

			decoder_etc_block::get_block_colors5(block_colors, base_color, inten_table);

			const uint32_t r0 = block_colors[0].r;
			const uint32_t g0 = block_colors[0].g;
			const uint32_t b0 = block_colors[0].b;

			const uint32_t r1 = block_colors[3].r;
			const uint32_t g1 = block_colors[3].g;
			const uint32_t b1 = block_colors[3].b;

			blk.m_endpoints[0] = g_astc_single_color_encoding_0[r0];
			blk.m_endpoints[1] = g_astc_single_color_encoding_0[r1];

			blk.m_endpoints[2] = g_astc_single_color_encoding_0[g0];
			blk.m_endpoints[3] = g_astc_single_color_encoding_0[g1];

			blk.m_endpoints[4] = g_astc_single_color_encoding_0[b0];
			blk.m_endpoints[5] = g_astc_single_color_encoding_0[b1];

			int s0 = g_ise_to_unquant[blk.m_endpoints[0]] + g_ise_to_unquant[blk.m_endpoints[2]] + g_ise_to_unquant[blk.m_endpoints[4]];
			int s1 = g_ise_to_unquant[blk.m_endpoints[1]] + g_ise_to_unquant[blk.m_endpoints[3]] + g_ise_to_unquant[blk.m_endpoints[5]];
			bool invert = false;

			if (s1 < s0)
			{
				std::swap(blk.m_endpoints[0], blk.m_endpoints[1]);
				std::swap(blk.m_endpoints[2], blk.m_endpoints[3]);
				std::swap(blk.m_endpoints[4], blk.m_endpoints[5]);
				invert = true;
			}

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					uint32_t as = (s == low_selector) ? 0 : 3;

					if (invert)
						as = 3 - as;

					blk.m_weights[(x + y * 4) * 2] = static_cast<uint8_t>(as);
				} // x
			} // y
		}
		else
		{
			// Convert ETC1S color
			const uint32_t selector_range_table = g_etc1_to_astc_selector_range_index[low_selector][high_selector];

			//[32][8][RANGES][MAPPING]
			const etc1_to_astc_solution* pTable_r = &g_etc1_to_astc[(inten_table * 32 + base_color.r) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
			const etc1_to_astc_solution* pTable_g = &g_etc1_to_astc[(inten_table * 32 + base_color.g) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];
			const etc1_to_astc_solution* pTable_b = &g_etc1_to_astc[(inten_table * 32 + base_color.b) * (NUM_ETC1_TO_ASTC_SELECTOR_RANGES * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS];

			uint32_t best_err = UINT_MAX;
			uint32_t best_mapping = 0;

			assert(NUM_ETC1_TO_ASTC_SELECTOR_MAPPINGS == 10);
#define DO_ITER(m) { uint32_t total_err = pTable_r[m].m_err + pTable_g[m].m_err + pTable_b[m].m_err; if (total_err < best_err) { best_err = total_err; best_mapping = m; } }
			DO_ITER(0); DO_ITER(1); DO_ITER(2); DO_ITER(3); DO_ITER(4);
			DO_ITER(5); DO_ITER(6); DO_ITER(7); DO_ITER(8); DO_ITER(9);
#undef DO_ITER

			blk.m_endpoints[0] = pTable_r[best_mapping].m_lo;
			blk.m_endpoints[1] = pTable_r[best_mapping].m_hi;

			blk.m_endpoints[2] = pTable_g[best_mapping].m_lo;
			blk.m_endpoints[3] = pTable_g[best_mapping].m_hi;

			blk.m_endpoints[4] = pTable_b[best_mapping].m_lo;
			blk.m_endpoints[5] = pTable_b[best_mapping].m_hi;
						
			int s0 = g_ise_to_unquant[blk.m_endpoints[0]] + g_ise_to_unquant[blk.m_endpoints[2]] + g_ise_to_unquant[blk.m_endpoints[4]];
			int s1 = g_ise_to_unquant[blk.m_endpoints[1]] + g_ise_to_unquant[blk.m_endpoints[3]] + g_ise_to_unquant[blk.m_endpoints[5]];
			bool invert = false;

			if (s1 < s0)
			{
				std::swap(blk.m_endpoints[0], blk.m_endpoints[1]);
				std::swap(blk.m_endpoints[2], blk.m_endpoints[3]);
				std::swap(blk.m_endpoints[4], blk.m_endpoints[5]);
				invert = true;
			}

			const uint8_t* pSelectors_xlat = &g_etc1_to_astc_selector_mappings[best_mapping][0];

			for (uint32_t y = 0; y < 4; y++)
			{
				for (uint32_t x = 0; x < 4; x++)
				{
					uint32_t s = pSelector->get_selector(x, y);
					uint32_t as = pSelectors_xlat[s];
					if (invert)
						as = 3 - as;

					blk.m_weights[(x + y * 4) * 2] = static_cast<uint8_t>(as);
				} // x
			} // y
		}

		// Now pack to ASTC
		astc_pack_block_cem_12_weight_range2(reinterpret_cast<uint32_t *>(pDst_block), &blk);
	}
#endif

#if BASISD_SUPPORT_ATC
	struct etc1s_to_atc_solution
	{
		uint8_t m_lo;
		uint8_t m_hi;
		uint16_t m_err;
	};

	static dxt_selector_range g_etc1s_to_atc_selector_ranges[] =
	{
		{ 0, 3 },
		{ 1, 3 },
		{ 0, 2 },
		{ 1, 2 },
		{ 2, 3 },
		{ 0, 1 },
	};

	const uint32_t NUM_ETC1S_TO_ATC_SELECTOR_RANGES = sizeof(g_etc1s_to_atc_selector_ranges) / sizeof(g_etc1s_to_atc_selector_ranges[0]);

	static uint32_t g_etc1s_to_atc_selector_range_index[4][4];

	const uint32_t NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS = 10;
	static const uint8_t g_etc1s_to_atc_selector_mappings[NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS][4] =
	{
		{ 0, 0, 1, 1 },
		{ 0, 0, 1, 2 },
		{ 0, 0, 1, 3 },
		{ 0, 0, 2, 3 },
		{ 0, 1, 1, 1 },
		{ 0, 1, 2, 2 },
		{ 0, 1, 2, 3 }, //6 - identity
		{ 0, 2, 3, 3 },
		{ 1, 2, 2, 2 },
		{ 1, 2, 3, 3 },
	};
	const uint32_t ATC_IDENTITY_SELECTOR_MAPPING_INDEX = 6;

	static const etc1s_to_atc_solution g_etc1s_to_atc_55[32 * 8 * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS * NUM_ETC1S_TO_ATC_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_atc_55.inc"
	};

	static const etc1s_to_atc_solution g_etc1s_to_atc_56[32 * 8 * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS * NUM_ETC1S_TO_ATC_SELECTOR_RANGES] = {
#include "basisu_transcoder_tables_atc_56.inc"
	};

	struct atc_match_entry
	{
		uint8_t m_lo;
		uint8_t m_hi;
	};
	static atc_match_entry g_atc_match55_equals_1[256], g_atc_match56_equals_1[256]; // selector 1
	static atc_match_entry g_atc_match5[256], g_atc_match6[256];

	static void prepare_atc_single_color_table(atc_match_entry* pTable, int size0, int size1, int sel)
	{
		for (int i = 0; i < 256; i++)
		{
			int lowest_e = 256;
			for (int lo = 0; lo < size0; lo++)
			{
				int lo_e = lo;
				if (size0 == 32)
					lo_e = (lo_e << 3) | (lo_e >> 2);
				else
					lo_e = (lo_e << 2) | (lo_e >> 4);

				for (int hi = 0; hi < size1; hi++)
				{
					int hi_e = hi;
					if (size1 == 32)
						hi_e = (hi_e << 3) | (hi_e >> 2);
					else
						hi_e = (hi_e << 2) | (hi_e >> 4);

					int e;

					if (sel == 1)
					{
						// Selector 1
						e = abs(((lo_e * 5 + hi_e * 3) / 8) - i);
					}
					else
					{
						assert(sel == 3);

						// Selector 3
						e = abs(hi_e - i);
					}

					if (e < lowest_e)
					{
						pTable[i].m_lo = static_cast<uint8_t>(lo);
						pTable[i].m_hi = static_cast<uint8_t>(hi);

						lowest_e = e;
					}

				} // hi
			} // lo
		} // i
	}

	static void transcoder_init_atc()
	{
		prepare_atc_single_color_table(g_atc_match55_equals_1, 32, 32, 1);
		prepare_atc_single_color_table(g_atc_match56_equals_1, 32, 64, 1);

		prepare_atc_single_color_table(g_atc_match5, 1, 32, 3);
		prepare_atc_single_color_table(g_atc_match6, 1, 64, 3);

		for (uint32_t i = 0; i < NUM_ETC1S_TO_ATC_SELECTOR_RANGES; i++)
		{
			uint32_t l = g_etc1s_to_atc_selector_ranges[i].m_low;
			uint32_t h = g_etc1s_to_atc_selector_ranges[i].m_high;
			g_etc1s_to_atc_selector_range_index[l][h] = i;
		}
	}

	struct atc_block
	{
		uint8_t m_lo[2];
		uint8_t m_hi[2];
		uint8_t m_sels[4];

		void set_low_color(uint32_t r, uint32_t g, uint32_t b)
		{
			assert((r < 32) && (g < 32) && (b < 32));
			uint32_t x = (r << 10) | (g << 5) | b;
			m_lo[0] = x & 0xFF;
			m_lo[1] = (x >> 8) & 0xFF;
		}

		void set_high_color(uint32_t r, uint32_t g, uint32_t b)
		{
			assert((r < 32) && (g < 64) && (b < 32));
			uint32_t x = (r << 11) | (g << 5) | b;
			m_hi[0] = x & 0xFF;
			m_hi[1] = (x >> 8) & 0xFF;
		}
	};

	static void convert_etc1s_to_atc(void* pDst, const endpoint* pEndpoints, const selector* pSelector)
	{
		atc_block* pBlock = static_cast<atc_block*>(pDst);

		const uint32_t low_selector = pSelector->m_lo_selector;
		const uint32_t high_selector = pSelector->m_hi_selector;

		const color32& base_color = pEndpoints->m_color5;
		const uint32_t inten_table = pEndpoints->m_inten5;

		if (low_selector == high_selector)
		{
			uint32_t r, g, b;
			decoder_etc_block::get_block_color5(base_color, inten_table, low_selector, r, g, b);

			pBlock->set_low_color(g_atc_match55_equals_1[r].m_lo, g_atc_match56_equals_1[g].m_lo, g_atc_match55_equals_1[b].m_lo);
			pBlock->set_high_color(g_atc_match55_equals_1[r].m_hi, g_atc_match56_equals_1[g].m_hi, g_atc_match55_equals_1[b].m_hi);
						
			pBlock->m_sels[0] = 0x55;
			pBlock->m_sels[1] = 0x55;
			pBlock->m_sels[2] = 0x55;
			pBlock->m_sels[3] = 0x55;

			return;
		}
		else if ((inten_table >= 7) && (pSelector->m_num_unique_selectors == 2) && (pSelector->m_lo_selector == 0) && (pSelector->m_hi_selector == 3))
		{
			color32 block_colors[4];
			decoder_etc_block::get_block_colors5(block_colors, base_color, inten_table);

			const uint32_t r0 = block_colors[0].r;
			const uint32_t g0 = block_colors[0].g;
			const uint32_t b0 = block_colors[0].b;

			const uint32_t r1 = block_colors[3].r;
			const uint32_t g1 = block_colors[3].g;
			const uint32_t b1 = block_colors[3].b;

			pBlock->set_low_color(g_atc_match5[r0].m_hi, g_atc_match5[g0].m_hi, g_atc_match5[b0].m_hi);
			pBlock->set_high_color(g_atc_match5[r1].m_hi, g_atc_match6[g1].m_hi, g_atc_match5[b1].m_hi);

			pBlock->m_sels[0] = pSelector->m_selectors[0];
			pBlock->m_sels[1] = pSelector->m_selectors[1];
			pBlock->m_sels[2] = pSelector->m_selectors[2];
			pBlock->m_sels[3] = pSelector->m_selectors[3];

			return;
		}

		const uint32_t selector_range_table = g_etc1s_to_atc_selector_range_index[low_selector][high_selector];

		//[32][8][RANGES][MAPPING]
		const etc1s_to_atc_solution* pTable_r = &g_etc1s_to_atc_55[(inten_table * 32 + base_color.r) * (NUM_ETC1S_TO_ATC_SELECTOR_RANGES * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS];
		const etc1s_to_atc_solution* pTable_g = &g_etc1s_to_atc_56[(inten_table * 32 + base_color.g) * (NUM_ETC1S_TO_ATC_SELECTOR_RANGES * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS];
		const etc1s_to_atc_solution* pTable_b = &g_etc1s_to_atc_55[(inten_table * 32 + base_color.b) * (NUM_ETC1S_TO_ATC_SELECTOR_RANGES * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS) + selector_range_table * NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS];

		uint32_t best_err = UINT_MAX;
		uint32_t best_mapping = 0;

		assert(NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS == 10);
#define DO_ITER(m) { uint32_t total_err = pTable_r[m].m_err + pTable_g[m].m_err + pTable_b[m].m_err; if (total_err < best_err) { best_err = total_err; best_mapping = m; } }
		DO_ITER(0); DO_ITER(1); DO_ITER(2); DO_ITER(3); DO_ITER(4);
		DO_ITER(5); DO_ITER(6); DO_ITER(7); DO_ITER(8); DO_ITER(9);
#undef DO_ITER

		pBlock->set_low_color(pTable_r[best_mapping].m_lo, pTable_g[best_mapping].m_lo, pTable_b[best_mapping].m_lo);
		pBlock->set_high_color(pTable_r[best_mapping].m_hi, pTable_g[best_mapping].m_hi, pTable_b[best_mapping].m_hi);

		if (ATC_IDENTITY_SELECTOR_MAPPING_INDEX == best_mapping)
		{
			pBlock->m_sels[0] = pSelector->m_selectors[0];
			pBlock->m_sels[1] = pSelector->m_selectors[1];
			pBlock->m_sels[2] = pSelector->m_selectors[2];
			pBlock->m_sels[3] = pSelector->m_selectors[3];
		}
		else
		{
			const uint8_t* pSelectors_xlat = &g_etc1s_to_atc_selector_mappings[best_mapping][0];

			const uint32_t sel_bits0 = pSelector->m_selectors[0];
			const uint32_t sel_bits1 = pSelector->m_selectors[1];
			const uint32_t sel_bits2 = pSelector->m_selectors[2];
			const uint32_t sel_bits3 = pSelector->m_selectors[3];

			uint32_t atc_sels0 = 0, atc_sels1 = 0, atc_sels2 = 0, atc_sels3 = 0;

#define DO_X(x) { \
			const uint32_t x_shift = (x) * 2; \
			atc_sels0 |= (pSelectors_xlat[(sel_bits0 >> x_shift) & 3] << x_shift); \
			atc_sels1 |= (pSelectors_xlat[(sel_bits1 >> x_shift) & 3] << x_shift); \
			atc_sels2 |= (pSelectors_xlat[(sel_bits2 >> x_shift) & 3] << x_shift); \
			atc_sels3 |= (pSelectors_xlat[(sel_bits3 >> x_shift) & 3] << x_shift); }

			DO_X(0);
			DO_X(1);
			DO_X(2);
			DO_X(3);
#undef DO_X

			pBlock->m_sels[0] = (uint8_t)atc_sels0;
			pBlock->m_sels[1] = (uint8_t)atc_sels1;
			pBlock->m_sels[2] = (uint8_t)atc_sels2;
			pBlock->m_sels[3] = (uint8_t)atc_sels3;
		}
	}

#if BASISD_WRITE_NEW_ATC_TABLES
	static void create_etc1s_to_atc_conversion_tables()
	{
		FILE* pFile = nullptr;
		fopen_s(&pFile, "basisu_transcoder_tables_atc_55.inc", "w");

		uint32_t n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1S_TO_ATC_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1s_to_atc_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1s_to_atc_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 31; hi++)
						{
							for (uint32_t lo = 0; lo <= 31; lo++)
							{
								uint32_t colors[4];

								colors[0] = (lo << 3) | (lo >> 2);
								colors[3] = (hi << 3) | (hi >> 2);

								colors[1] = (colors[0] * 5 + colors[3] * 3) / 8;
								colors[2] = (colors[3] * 5 + colors[0] * 3) / 8;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1s_to_atc_selector_mappings[m][s]];

									int err_scale = 1;
									// Special case when the intensity table is 7, low_selector is 0, and high_selector is 3. In this extreme case, it's likely the encoder is trying to strongly favor 
									// the low/high selectors which are clamping to either 0 or 255.
									if (((inten == 7) && (low_selector == 0) && (high_selector == 3)) && ((s == 0) || (s == 3)))
										err_scale = 5;

									total_err += (err * err) * err_scale;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						//assert(best_err <= 0xFFFF);
						best_err = basisu::minimum<uint32_t>(best_err, 0xFFFF);

						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
		pFile = nullptr;

		fopen_s(&pFile, "basisu_transcoder_tables_atc_56.inc", "w");

		n = 0;

		for (int inten = 0; inten < 8; inten++)
		{
			for (uint32_t g = 0; g < 32; g++)
			{
				color32 block_colors[4];
				decoder_etc_block::get_diff_subblock_colors(block_colors, decoder_etc_block::pack_color5(color32(g, g, g, 255), false), inten);

				for (uint32_t sr = 0; sr < NUM_ETC1S_TO_ATC_SELECTOR_RANGES; sr++)
				{
					const uint32_t low_selector = g_etc1s_to_atc_selector_ranges[sr].m_low;
					const uint32_t high_selector = g_etc1s_to_atc_selector_ranges[sr].m_high;

					for (uint32_t m = 0; m < NUM_ETC1S_TO_ATC_SELECTOR_MAPPINGS; m++)
					{
						uint32_t best_lo = 0;
						uint32_t best_hi = 0;
						uint64_t best_err = UINT64_MAX;

						for (uint32_t hi = 0; hi <= 63; hi++)
						{
							for (uint32_t lo = 0; lo <= 31; lo++)
							{
								uint32_t colors[4];

								colors[0] = (lo << 3) | (lo >> 2);
								colors[3] = (hi << 2) | (hi >> 4);

								colors[1] = (colors[0] * 5 + colors[3] * 3) / 8;
								colors[2] = (colors[3] * 5 + colors[0] * 3) / 8;

								uint64_t total_err = 0;

								for (uint32_t s = low_selector; s <= high_selector; s++)
								{
									int err = block_colors[s].g - colors[g_etc1s_to_atc_selector_mappings[m][s]];

									int err_scale = 1;
									// Special case when the intensity table is 7, low_selector is 0, and high_selector is 3. In this extreme case, it's likely the encoder is trying to strongly favor 
									// the low/high selectors which are clamping to either 0 or 255.
									if (((inten == 7) && (low_selector == 0) && (high_selector == 3)) && ((s == 0) || (s == 3)))
										err_scale = 5;

									total_err += (err * err) * err_scale;
								}

								if (total_err < best_err)
								{
									best_err = total_err;
									best_lo = lo;
									best_hi = hi;
								}
							}
						}

						//assert(best_err <= 0xFFFF);
						best_err = basisu::minimum<uint32_t>(best_err, 0xFFFF);

						fprintf(pFile, "{%u,%u,%u},", best_lo, best_hi, (uint32_t)best_err);
						n++;
						if ((n & 31) == 31)
							fprintf(pFile, "\n");
					} // m
				} // sr
			} // g
		} // inten

		fclose(pFile);
	}
#endif // BASISD_WRITE_NEW_ATC_TABLES

#endif // BASISD_SUPPORT_ATC

	basisu_lowlevel_transcoder::basisu_lowlevel_transcoder(const etc1_global_selector_codebook* pGlobal_sel_codebook) :
		m_pGlobal_sel_codebook(pGlobal_sel_codebook),
		m_selector_history_buf_size(0)
	{
	}

	bool basisu_lowlevel_transcoder::decode_palettes(
		uint32_t num_endpoints, const uint8_t* pEndpoints_data, uint32_t endpoints_data_size,
		uint32_t num_selectors, const uint8_t* pSelectors_data, uint32_t selectors_data_size)
	{
		bitwise_decoder sym_codec;

		huffman_decoding_table color5_delta_model0, color5_delta_model1, color5_delta_model2, inten_delta_model;

		if (!sym_codec.init(pEndpoints_data, endpoints_data_size))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 0\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(color5_delta_model0))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 1\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(color5_delta_model1))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 1a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(color5_delta_model2))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 2a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(inten_delta_model))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 2b\n");
			return false;
		}

		if (!color5_delta_model0.is_valid() || !color5_delta_model1.is_valid() || !color5_delta_model2.is_valid() || !inten_delta_model.is_valid())
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 2b\n");
			return false;
		}

		const bool endpoints_are_grayscale = sym_codec.get_bits(1) != 0;

		m_endpoints.resize(num_endpoints);

		color32 prev_color5(16, 16, 16, 0);
		uint32_t prev_inten = 0;

		for (uint32_t i = 0; i < num_endpoints; i++)
		{
			uint32_t inten_delta = sym_codec.decode_huffman(inten_delta_model);
			m_endpoints[i].m_inten5 = static_cast<uint8_t>((inten_delta + prev_inten) & 7);
			prev_inten = m_endpoints[i].m_inten5;

			for (uint32_t c = 0; c < (endpoints_are_grayscale ? 1U : 3U); c++)
			{
				int delta;
				if (prev_color5[c] <= basist::COLOR5_PAL0_PREV_HI)
					delta = sym_codec.decode_huffman(color5_delta_model0);
				else if (prev_color5[c] <= basist::COLOR5_PAL1_PREV_HI)
					delta = sym_codec.decode_huffman(color5_delta_model1);
				else
					delta = sym_codec.decode_huffman(color5_delta_model2);

				int v = (prev_color5[c] + delta) & 31;

				m_endpoints[i].m_color5[c] = static_cast<uint8_t>(v);

				prev_color5[c] = static_cast<uint8_t>(v);
			}

			if (endpoints_are_grayscale)
			{
				m_endpoints[i].m_color5[1] = m_endpoints[i].m_color5[0];
				m_endpoints[i].m_color5[2] = m_endpoints[i].m_color5[0];
			}
		}

		sym_codec.stop();

		m_selectors.resize(num_selectors);
		
		if (!sym_codec.init(pSelectors_data, selectors_data_size))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 5\n");
			return false;
		}

		basist::huffman_decoding_table delta_selector_pal_model;

		const bool used_global_selector_cb = (sym_codec.get_bits(1) == 1);

		if (used_global_selector_cb)
		{
			// global selector palette
			uint32_t pal_bits = sym_codec.get_bits(4);
			uint32_t mod_bits = sym_codec.get_bits(4);

			basist::huffman_decoding_table mod_model;
			if (mod_bits)
			{
				if (!sym_codec.read_huffman_table(mod_model))
				{
					BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 6\n");
					return false;
				}
				if (!mod_model.is_valid())
				{
					BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 6a\n");
					return false;
				}
			}

			for (uint32_t i = 0; i < num_selectors; i++)
			{
				uint32_t pal_index = 0;
				if (pal_bits)
					pal_index = sym_codec.get_bits(pal_bits);

				uint32_t mod_index = 0;
				if (mod_bits)
					mod_index = sym_codec.decode_huffman(mod_model);

				if (pal_index >= m_pGlobal_sel_codebook->size())
				{
					BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 7z\n");
					return false;
				}

				const etc1_selector_palette_entry e(m_pGlobal_sel_codebook->get_entry(pal_index, etc1_global_palette_entry_modifier(mod_index)));

				// TODO: Optimize this
				for (uint32_t y = 0; y < 4; y++)
					for (uint32_t x = 0; x < 4; x++)
						m_selectors[i].set_selector(x, y, e[x + y * 4]);

				m_selectors[i].init_flags();
			}
		}
		else
		{
			const bool used_hybrid_selector_cb = (sym_codec.get_bits(1) == 1);

			if (used_hybrid_selector_cb)
			{
				const uint32_t pal_bits = sym_codec.get_bits(4);
				const uint32_t mod_bits = sym_codec.get_bits(4);

				basist::huffman_decoding_table uses_global_cb_bitflags_model;
				if (!sym_codec.read_huffman_table(uses_global_cb_bitflags_model))
				{
					BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 7\n");
					return false;
				}
				if (!uses_global_cb_bitflags_model.is_valid())
				{
					BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 7a\n");
					return false;
				}

				basist::huffman_decoding_table global_mod_indices_model;
				if (mod_bits)
				{
					if (!sym_codec.read_huffman_table(global_mod_indices_model))
					{
						BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 8\n");
						return false;
					}
					if (!global_mod_indices_model.is_valid())
					{
						BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 8a\n");
						return false;
					}
				}

				uint32_t cur_uses_global_cb_bitflags = 0;
				uint32_t uses_global_cb_bitflags_remaining = 0;

				for (uint32_t q = 0; q < num_selectors; q++)
				{
					if (!uses_global_cb_bitflags_remaining)
					{
						cur_uses_global_cb_bitflags = sym_codec.decode_huffman(uses_global_cb_bitflags_model);

						uses_global_cb_bitflags_remaining = 8;
					}
					uses_global_cb_bitflags_remaining--;

					const bool used_global_cb_flag = (cur_uses_global_cb_bitflags & 1) != 0;
					cur_uses_global_cb_bitflags >>= 1;

					if (used_global_cb_flag)
					{
						const uint32_t pal_index = pal_bits ? sym_codec.get_bits(pal_bits) : 0;
						const uint32_t mod_index = mod_bits ? sym_codec.decode_huffman(global_mod_indices_model) : 0;

						if (pal_index >= m_pGlobal_sel_codebook->size())
						{
							BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 8b\n");
							return false;
						}

						const etc1_selector_palette_entry e(m_pGlobal_sel_codebook->get_entry(pal_index, etc1_global_palette_entry_modifier(mod_index)));

						for (uint32_t y = 0; y < 4; y++)
							for (uint32_t x = 0; x < 4; x++)
								m_selectors[q].set_selector(x, y, e[x + y * 4]);
					}
					else
					{
						for (uint32_t j = 0; j < 4; j++)
						{
							uint32_t cur_byte = sym_codec.get_bits(8);

							for (uint32_t k = 0; k < 4; k++)
								m_selectors[q].set_selector(k, j, (cur_byte >> (k * 2)) & 3);
						}
					}

					m_selectors[q].init_flags();
				}
			}
			else
			{
				const bool used_raw_encoding = (sym_codec.get_bits(1) == 1);

				if (used_raw_encoding)
				{
					for (uint32_t i = 0; i < num_selectors; i++)
					{
						for (uint32_t j = 0; j < 4; j++)
						{
							uint32_t cur_byte = sym_codec.get_bits(8);

							for (uint32_t k = 0; k < 4; k++)
								m_selectors[i].set_selector(k, j, (cur_byte >> (k * 2)) & 3);
						}

						m_selectors[i].init_flags();
					}
				}
				else
				{
					if (!sym_codec.read_huffman_table(delta_selector_pal_model))
					{
						BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 10\n");
						return false;
					}

					if ((num_selectors > 1) && (!delta_selector_pal_model.is_valid()))
					{
						BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_palettes: fail 10a\n");
						return false;
					}

					uint8_t prev_bytes[4] = { 0, 0, 0, 0 };

					for (uint32_t i = 0; i < num_selectors; i++)
					{
						if (!i)
						{
							for (uint32_t j = 0; j < 4; j++)
							{
								uint32_t cur_byte = sym_codec.get_bits(8);
								prev_bytes[j] = static_cast<uint8_t>(cur_byte);

								for (uint32_t k = 0; k < 4; k++)
									m_selectors[i].set_selector(k, j, (cur_byte >> (k * 2)) & 3);
							}
							m_selectors[i].init_flags();
							continue;
						}

						for (uint32_t j = 0; j < 4; j++)
						{
							int delta_byte = sym_codec.decode_huffman(delta_selector_pal_model);

							uint32_t cur_byte = delta_byte ^ prev_bytes[j];
							prev_bytes[j] = static_cast<uint8_t>(cur_byte);

							for (uint32_t k = 0; k < 4; k++)
								m_selectors[i].set_selector(k, j, (cur_byte >> (k * 2)) & 3);
						}
						m_selectors[i].init_flags();
					}
				}
			}
		}

		sym_codec.stop();

		return true;
	}

	bool basisu_lowlevel_transcoder::decode_tables(const uint8_t* pTable_data, uint32_t table_data_size)
	{
		basist::bitwise_decoder sym_codec;
		if (!sym_codec.init(pTable_data, table_data_size))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 0\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(m_endpoint_pred_model))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 1\n");
			return false;
		}

		if (m_endpoint_pred_model.get_code_sizes().size() == 0)
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 1a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(m_delta_endpoint_model))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 2\n");
			return false;
		}

		if (m_delta_endpoint_model.get_code_sizes().size() == 0)
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 2a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(m_selector_model))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 3\n");
			return false;
		}

		if (m_selector_model.get_code_sizes().size() == 0)
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 3a\n");
			return false;
		}

		if (!sym_codec.read_huffman_table(m_selector_history_buf_rle_model))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 4\n");
			return false;
		}

		if (m_selector_history_buf_rle_model.get_code_sizes().size() == 0)
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::decode_tables: fail 4a\n");
			return false;
		}

		m_selector_history_buf_size = sym_codec.get_bits(13);

		sym_codec.stop();

		return true;
	}

	bool basisu_lowlevel_transcoder::transcode_slice(void* pDst_blocks, uint32_t num_blocks_x, uint32_t num_blocks_y, const uint8_t* pImage_data, uint32_t image_data_size, block_format fmt,
		uint32_t output_block_or_pixel_stride_in_bytes, bool pvrtc_wrap_addressing, bool bc1_allow_threecolor_blocks, const basis_file_header& header, const basis_slice_desc& slice_desc, uint32_t output_row_pitch_in_blocks_or_pixels,
		basisu_transcoder_state* pState, bool transcode_alpha, void *pAlpha_blocks, uint32_t output_rows_in_pixels)
	{
		(void)transcode_alpha;
		(void)pAlpha_blocks;
		(void)pvrtc_wrap_addressing;

		if (!pState)
			pState = &m_def_state;

		const bool is_video = (header.m_tex_type == cBASISTexTypeVideoFrames);
		const uint32_t total_blocks = num_blocks_x * num_blocks_y;

		if (!output_row_pitch_in_blocks_or_pixels)
		{
			if (basis_block_format_is_uncompressed(fmt))
				output_row_pitch_in_blocks_or_pixels = slice_desc.m_orig_width;
			else
				output_row_pitch_in_blocks_or_pixels = num_blocks_x;
		}

		if (basis_block_format_is_uncompressed(fmt))
		{
			if (!output_rows_in_pixels)
				output_rows_in_pixels = slice_desc.m_orig_height;
		}
		
		std::vector<uint32_t>* pPrev_frame_indices = nullptr;
		if (is_video)
		{
			// TODO: Add check to make sure the caller hasn't tried skipping past p-frames
			const bool alpha_flag = (slice_desc.m_flags & cSliceDescFlagsIsAlphaData) != 0;
			const uint32_t level_index = slice_desc.m_level_index;

			if (level_index >= basisu_transcoder_state::cMaxPrevFrameLevels)
			{
				BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: unsupported level_index\n");
				return false;
			}

			pPrev_frame_indices = &pState->m_prev_frame_indices[alpha_flag][level_index];
			if (pPrev_frame_indices->size() < total_blocks)
				pPrev_frame_indices->resize(total_blocks);
		}

		basist::bitwise_decoder sym_codec;

		if (!sym_codec.init(pImage_data, image_data_size))
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: sym_codec.init failed\n");
			return false;
		}

		approx_move_to_front selector_history_buf(m_selector_history_buf_size);

		const uint32_t SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX = (uint32_t)m_selectors.size();
		const uint32_t SELECTOR_HISTORY_BUF_RLE_SYMBOL_INDEX = m_selector_history_buf_size + SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX;
		uint32_t cur_selector_rle_count = 0;

		decoder_etc_block block;
		memset(&block, 0, sizeof(block));

		block.set_flip_bit(true);
		block.set_diff_bit(true);

		void* pPVRTC_work_mem = nullptr;
		uint32_t* pPVRTC_endpoints = nullptr;
		if ((fmt == cPVRTC1_4_RGB) || (fmt == cPVRTC1_4_RGBA))
		{
			pPVRTC_work_mem = malloc(num_blocks_x * num_blocks_y * (sizeof(decoder_etc_block) + sizeof(uint32_t)));
			if (!pPVRTC_work_mem)
			{
				BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: malloc failed\n");
				return false;
			}
			pPVRTC_endpoints = (uint32_t*) & ((decoder_etc_block*)pPVRTC_work_mem)[num_blocks_x * num_blocks_y];
		}

		if (pState->m_block_endpoint_preds[0].size() < num_blocks_x)
		{
			pState->m_block_endpoint_preds[0].resize(num_blocks_x);
			pState->m_block_endpoint_preds[1].resize(num_blocks_x);
		}

		uint32_t cur_pred_bits = 0;
		int prev_endpoint_pred_sym = 0;
		int endpoint_pred_repeat_count = 0;
		uint32_t prev_endpoint_index = 0;

		for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
		{
			const uint32_t cur_block_endpoint_pred_array = block_y & 1;

			for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
			{
				// Decode endpoint index predictor symbols
				if ((block_x & 1) == 0)
				{
					if ((block_y & 1) == 0)
					{
						if (endpoint_pred_repeat_count)
						{
							endpoint_pred_repeat_count--;
							cur_pred_bits = prev_endpoint_pred_sym;
						}
						else
						{
							cur_pred_bits = sym_codec.decode_huffman(m_endpoint_pred_model);
							if (cur_pred_bits == ENDPOINT_PRED_REPEAT_LAST_SYMBOL)
							{
								endpoint_pred_repeat_count = sym_codec.decode_vlc(ENDPOINT_PRED_COUNT_VLC_BITS) + ENDPOINT_PRED_MIN_REPEAT_COUNT - 1;

								cur_pred_bits = prev_endpoint_pred_sym;
							}
							else
							{
								prev_endpoint_pred_sym = cur_pred_bits;
							}
						}

						pState->m_block_endpoint_preds[cur_block_endpoint_pred_array ^ 1][block_x].m_pred_bits = (uint8_t)(cur_pred_bits >> 4);
					}
					else
					{
						cur_pred_bits = pState->m_block_endpoint_preds[cur_block_endpoint_pred_array][block_x].m_pred_bits;
					}
				}

				// Decode endpoint index
				uint32_t endpoint_index, selector_index = 0;

				const uint32_t pred = cur_pred_bits & 3;
				cur_pred_bits >>= 2;

				if (pred == 0)
				{
					// Left
					if (!block_x)
					{
						BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: invalid datastream (0)\n");
						if (pPVRTC_work_mem)
							free(pPVRTC_work_mem);
						return false;
					}

					endpoint_index = prev_endpoint_index;
				}
				else if (pred == 1)
				{
					// Upper
					if (!block_y)
					{
						BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: invalid datastream (1)\n");
						if (pPVRTC_work_mem)
							free(pPVRTC_work_mem);
						return false;
					}

					endpoint_index = pState->m_block_endpoint_preds[cur_block_endpoint_pred_array ^ 1][block_x].m_endpoint_index;
				}
				else if (pred == 2)
				{
					if (is_video)
					{
						assert(pred == CR_ENDPOINT_PRED_INDEX);
						endpoint_index = (*pPrev_frame_indices)[block_x + block_y * num_blocks_x];
						selector_index = endpoint_index >> 16;
						endpoint_index &= 0xFFFFU;
					}
					else
					{
						// Upper left
						if ((!block_x) || (!block_y))
						{
							BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: invalid datastream (2)\n");
							if (pPVRTC_work_mem)
								free(pPVRTC_work_mem);
							return false;
						}

						endpoint_index = pState->m_block_endpoint_preds[cur_block_endpoint_pred_array ^ 1][block_x - 1].m_endpoint_index;
					}
				}
				else
				{
					// Decode and apply delta
					const uint32_t delta_sym = sym_codec.decode_huffman(m_delta_endpoint_model);

					endpoint_index = delta_sym + prev_endpoint_index;
					if (endpoint_index >= m_endpoints.size())
						endpoint_index -= (int)m_endpoints.size();
				}

				pState->m_block_endpoint_preds[cur_block_endpoint_pred_array][block_x].m_endpoint_index = (uint16_t)endpoint_index;

				prev_endpoint_index = endpoint_index;

				// Decode selector index
				if ((!is_video) || (pred != CR_ENDPOINT_PRED_INDEX))
				{
					int selector_sym;
					if (cur_selector_rle_count > 0)
					{
						cur_selector_rle_count--;

						selector_sym = (int)m_selectors.size();
					}
					else
					{
						selector_sym = sym_codec.decode_huffman(m_selector_model);

						if (selector_sym == static_cast<int>(SELECTOR_HISTORY_BUF_RLE_SYMBOL_INDEX))
						{
							int run_sym = sym_codec.decode_huffman(m_selector_history_buf_rle_model);

							if (run_sym == (SELECTOR_HISTORY_BUF_RLE_COUNT_TOTAL - 1))
								cur_selector_rle_count = sym_codec.decode_vlc(7) + SELECTOR_HISTORY_BUF_RLE_COUNT_THRESH;
							else
								cur_selector_rle_count = run_sym + SELECTOR_HISTORY_BUF_RLE_COUNT_THRESH;

							if (cur_selector_rle_count > total_blocks)
							{
								// The file is corrupted or we've got a bug.
								BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: invalid datastream (3)\n");
								if (pPVRTC_work_mem)
									free(pPVRTC_work_mem);
								return false;
							}

							selector_sym = (int)m_selectors.size();

							cur_selector_rle_count--;
						}
					}

					if (selector_sym >= (int)m_selectors.size())
					{
						assert(m_selector_history_buf_size > 0);

						int history_buf_index = selector_sym - (int)m_selectors.size();

						if (history_buf_index >= (int)selector_history_buf.size())
						{
							// The file is corrupted or we've got a bug.
							BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: invalid datastream (4)\n");
							if (pPVRTC_work_mem)
								free(pPVRTC_work_mem);
							return false;
						}

						selector_index = selector_history_buf[history_buf_index];

						if (history_buf_index != 0)
							selector_history_buf.use(history_buf_index);
					}
					else
					{
						selector_index = selector_sym;

						if (m_selector_history_buf_size)
							selector_history_buf.add(selector_index);
					}
				}

				if ((endpoint_index >= m_endpoints.size()) || (selector_index >= m_selectors.size()))
				{
					// The file is corrupted or we've got a bug.
					BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: invalid datastream (5)\n");
					if (pPVRTC_work_mem)
						free(pPVRTC_work_mem);
					return false;
				}

				if (is_video)
					(*pPrev_frame_indices)[block_x + block_y * num_blocks_x] = endpoint_index | (selector_index << 16);

#if BASISD_ENABLE_DEBUG_FLAGS
				if ((g_debug_flags & cDebugFlagVisCRs) && ((fmt == cETC1) || (fmt == cBC1)))
				{
					if ((is_video) && (pred == 2))
					{
						decoder_etc_block* pDst_block = reinterpret_cast<decoder_etc_block*>(static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes);
						memset(pDst_block, 0xFF, 8);
						continue;
					}
				}
#endif

				const endpoint* pEndpoints = &m_endpoints[endpoint_index];
				const selector* pSelector = &m_selectors[selector_index];

				switch (fmt)
				{
				case cETC1:
				{
					decoder_etc_block* pDst_block = reinterpret_cast<decoder_etc_block*>(static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes);
					
					block.set_base5_color(decoder_etc_block::pack_color5(pEndpoints->m_color5, false));
					block.set_inten_table(0, pEndpoints->m_inten5);
					block.set_inten_table(1, pEndpoints->m_inten5);

					pDst_block->m_uint32[0] = block.m_uint32[0];
					pDst_block->set_raw_selector_bits(pSelector->m_bytes[0], pSelector->m_bytes[1], pSelector->m_bytes[2], pSelector->m_bytes[3]);

					break;
				}
				case cBC1:
				{
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;

#if BASISD_SUPPORT_DXT1
#if BASISD_ENABLE_DEBUG_FLAGS
					if (g_debug_flags & (cDebugFlagVisBC1Sels | cDebugFlagVisBC1Endpoints))
						convert_etc1s_to_dxt1_vis(static_cast<dxt1_block*>(pDst_block), pEndpoints, pSelector, bc1_allow_threecolor_blocks);
					else
#endif
						convert_etc1s_to_dxt1(static_cast<dxt1_block*>(pDst_block), pEndpoints, pSelector, bc1_allow_threecolor_blocks);
#else
					assert(0);
#endif
					break;
				}
				case cBC4:
				{
#if BASISD_SUPPORT_DXT5A
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_dxt5a(static_cast<dxt5a_block*>(pDst_block), pEndpoints, pSelector);
#else
					assert(0);
#endif
					break;
				}
				case cPVRTC1_4_RGB:
				{
#if BASISD_SUPPORT_PVRTC1
					block.set_base5_color(decoder_etc_block::pack_color5(pEndpoints->m_color5, false));
					block.set_inten_table(0, pEndpoints->m_inten5);
					block.set_inten_table(1, pEndpoints->m_inten5);
					block.set_raw_selector_bits(pSelector->m_bytes[0], pSelector->m_bytes[1], pSelector->m_bytes[2], pSelector->m_bytes[3]);

					((decoder_etc_block*)pPVRTC_work_mem)[block_x + block_y * num_blocks_x] = block;

					const color32& base_color = pEndpoints->m_color5;
					const uint32_t inten_table = pEndpoints->m_inten5;

					const uint32_t low_selector = pSelector->m_lo_selector;
					const uint32_t high_selector = pSelector->m_hi_selector;

					// Get block's RGB bounding box 
					color32 block_colors[2];
					decoder_etc_block::get_block_colors5_bounds(block_colors, base_color, inten_table, low_selector, high_selector);

					assert(block_colors[0][0] <= block_colors[1][0]);
					assert(block_colors[0][1] <= block_colors[1][1]);
					assert(block_colors[0][2] <= block_colors[1][2]);

					// Set PVRTC1 endpoints to floor/ceil of bounding box's coordinates.
					pvrtc4_block temp;
					temp.set_opaque_endpoint_floor(0, block_colors[0]);
					temp.set_opaque_endpoint_ceil(1, block_colors[1]);

					pPVRTC_endpoints[block_x + block_y * num_blocks_x] = temp.m_endpoints;
#else
					assert(0);
#endif	

					break;
				}
				case cPVRTC1_4_RGBA:
				{
#if BASISD_SUPPORT_PVRTC1
					assert(pAlpha_blocks);
					
					block.set_base5_color(decoder_etc_block::pack_color5(pEndpoints->m_color5, false));
					block.set_inten_table(0, pEndpoints->m_inten5);
					block.set_inten_table(1, pEndpoints->m_inten5);
					block.set_raw_selector_bits(pSelector->m_selectors[0], pSelector->m_selectors[1], pSelector->m_selectors[2], pSelector->m_selectors[3]);

					((decoder_etc_block*)pPVRTC_work_mem)[block_x + block_y * num_blocks_x] = block;

					// Get block's RGBA bounding box 
					const color32& base_color = pEndpoints->m_color5;
					const uint32_t inten_table = pEndpoints->m_inten5;
					const uint32_t low_selector = pSelector->m_lo_selector;
					const uint32_t high_selector = pSelector->m_hi_selector;
					color32 block_colors[2];
					decoder_etc_block::get_block_colors5_bounds(block_colors, base_color, inten_table, low_selector, high_selector);

					assert(block_colors[0][0] <= block_colors[1][0]);
					assert(block_colors[0][1] <= block_colors[1][1]);
					assert(block_colors[0][2] <= block_colors[1][2]);

					const uint16_t* pAlpha_block = reinterpret_cast<uint16_t*>(static_cast<uint8_t*>(pAlpha_blocks) + (block_x + block_y * num_blocks_x) * sizeof(uint32_t));

					const endpoint* pAlpha_endpoints = &m_endpoints[pAlpha_block[0]];
					const selector* pAlpha_selector = &m_selectors[pAlpha_block[1]];

					const color32& alpha_base_color = pAlpha_endpoints->m_color5;
					const uint32_t alpha_inten_table = pAlpha_endpoints->m_inten5;
					const uint32_t alpha_low_selector = pAlpha_selector->m_lo_selector;
					const uint32_t alpha_high_selector = pAlpha_selector->m_hi_selector;
					uint32_t alpha_block_colors[2];
					decoder_etc_block::get_block_colors5_bounds_g(alpha_block_colors, alpha_base_color, alpha_inten_table, alpha_low_selector, alpha_high_selector);
					assert(alpha_block_colors[0] <= alpha_block_colors[1]);
					block_colors[0].a = (uint8_t)alpha_block_colors[0];
					block_colors[1].a = (uint8_t)alpha_block_colors[1];

					// Set PVRTC1 endpoints to floor/ceil of bounding box's coordinates.
					pvrtc4_block temp;
					temp.set_endpoint_floor(0, block_colors[0]);
					temp.set_endpoint_ceil(1, block_colors[1]);

					pPVRTC_endpoints[block_x + block_y * num_blocks_x] = temp.m_endpoints;
#else
					assert(0);
#endif	

					break;
				}
				case cBC7_M6_OPAQUE_ONLY:
				{
#if BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_bc7_m6(static_cast<bc7_mode_6*>(pDst_block), pEndpoints, pSelector);
#else	
					assert(0);
#endif
					break;
				}
				case cBC7_M5_COLOR:
				{
#if BASISD_SUPPORT_BC7_MODE5
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_bc7_m5_color(pDst_block, pEndpoints, pSelector);
#else
					assert(0);
#endif
					break;
				}
				case cBC7_M5_ALPHA:
				{
#if BASISD_SUPPORT_BC7_MODE5
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_bc7_m5_alpha(pDst_block, pEndpoints, pSelector);
#else
					assert(0);
#endif
					break;
				}
				case cETC2_EAC_A8:
				{
#if BASISD_SUPPORT_ETC2_EAC_A8
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_etc2_eac_a8(static_cast<eac_a8_block*>(pDst_block), pEndpoints, pSelector);
#else
					assert(0);
#endif
					break;
				}
				case cASTC_4x4:
				{
#if BASISD_SUPPORT_ASTC
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_astc_4x4(pDst_block, pEndpoints, pSelector, transcode_alpha, &m_endpoints[0], &m_selectors[0]);
#else
					assert(0);
#endif
					break;
				}
				case cATC_RGB:
				{
#if BASISD_SUPPORT_ATC
					void* pDst_block = static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes;
					convert_etc1s_to_atc(pDst_block, pEndpoints, pSelector);
#else
					assert(0);
#endif
					break;
				}
				case cIndices:
				{
					uint16_t* pDst_block = reinterpret_cast<uint16_t *>(static_cast<uint8_t*>(pDst_blocks) + (block_x + block_y * output_row_pitch_in_blocks_or_pixels) * output_block_or_pixel_stride_in_bytes);
					pDst_block[0] = static_cast<uint16_t>(endpoint_index);
					pDst_block[1] = static_cast<uint16_t>(selector_index);
					break;
				}
				case cA32:
				{
					assert(sizeof(uint32_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint32_t);
										
					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);
					
					int colors[4];
					decoder_etc_block::get_block_colors5_g(colors, pEndpoints->m_color5, pEndpoints->m_inten5);

					if (max_x == 4)
					{
						for (uint32_t y = 0; y < max_y; y++)
						{
							const uint32_t s = pSelector->m_selectors[y];

							pDst_pixels[3] = static_cast<uint8_t>(colors[s & 3]);
							pDst_pixels[3+4] = static_cast<uint8_t>(colors[(s >> 2) & 3]);
							pDst_pixels[3+8] = static_cast<uint8_t>(colors[(s >> 4) & 3]);
							pDst_pixels[3+12] = static_cast<uint8_t>(colors[(s >> 6) & 3]);
							
							pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint32_t);
						}
					}
					else
					{
						for (uint32_t y = 0; y < max_y; y++)
						{
							const uint32_t s = pSelector->m_selectors[y];

							for (uint32_t x = 0; x < max_x; x++)
								pDst_pixels[3 + 4 * x] = static_cast<uint8_t>(colors[(s >> (x * 2)) & 3]);

							pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint32_t);
						}
					}

					break;
				}
				case cRGB32:
				{
					assert(sizeof(uint32_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint32_t);

					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);

					color32 colors[4];
					decoder_etc_block::get_block_colors5(colors, pEndpoints->m_color5, pEndpoints->m_inten5);
					
					for (uint32_t y = 0; y < max_y; y++)
					{
						const uint32_t s = pSelector->m_selectors[y];

						for (uint32_t x = 0; x < max_x; x++)
						{
							const color32& c = colors[(s >> (x * 2)) & 3];

							pDst_pixels[0 + 4 * x] = c.r;
							pDst_pixels[1 + 4 * x] = c.g;
							pDst_pixels[2 + 4 * x] = c.b;
						}

						pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint32_t);
					}

					break;
				}
				case cRGBA32:
				{
					assert(sizeof(uint32_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint32_t);

					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);

					color32 colors[4];
					decoder_etc_block::get_block_colors5(colors, pEndpoints->m_color5, pEndpoints->m_inten5);

					for (uint32_t y = 0; y < max_y; y++)
					{
						const uint32_t s = pSelector->m_selectors[y];

						for (uint32_t x = 0; x < max_x; x++)
						{
							const color32& c = colors[(s >> (x * 2)) & 3];

							pDst_pixels[0 + 4 * x] = c.r;
							pDst_pixels[1 + 4 * x] = c.g;
							pDst_pixels[2 + 4 * x] = c.b;
							pDst_pixels[3 + 4 * x] = 255;
						}

						pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint32_t);
					}

					break;
				}
				case cRGB565:
				case cBGR565:
				{
					assert(sizeof(uint16_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint16_t);

					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);

					color32 colors[4];
					decoder_etc_block::get_block_colors5(colors, pEndpoints->m_color5, pEndpoints->m_inten5);

					uint16_t packed_colors[4];
					if (fmt == cRGB565)
					{
						for (uint32_t i = 0; i < 4; i++)
							packed_colors[i] = static_cast<uint16_t>(((colors[i].r >> 3) << 11) | ((colors[i].g >> 2) << 5) | (colors[i].b >> 3));
					}
					else
					{
						for (uint32_t i = 0; i < 4; i++)
							packed_colors[i] = static_cast<uint16_t>(((colors[i].b >> 3) << 11) | ((colors[i].g >> 2) << 5) | (colors[i].r >> 3));
					}

					for (uint32_t y = 0; y < max_y; y++)
					{
						const uint32_t s = pSelector->m_selectors[y];

						for (uint32_t x = 0; x < max_x; x++)
							reinterpret_cast<uint16_t *>(pDst_pixels)[x] = packed_colors[(s >> (x * 2)) & 3];

						pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint16_t);
					}

					break;
				}
				case cRGBA4444_COLOR:
				{
					assert(sizeof(uint16_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint16_t);

					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);

					color32 colors[4];
					decoder_etc_block::get_block_colors5(colors, pEndpoints->m_color5, pEndpoints->m_inten5);

					uint16_t packed_colors[4];
					for (uint32_t i = 0; i < 4; i++)
						packed_colors[i] = static_cast<uint16_t>(((colors[i].r >> 4) << 12) | ((colors[i].g >> 4) << 8) | ((colors[i].b >> 4) << 4));

					for (uint32_t y = 0; y < max_y; y++)
					{
						const uint32_t s = pSelector->m_selectors[y];

						for (uint32_t x = 0; x < max_x; x++)
						{
							uint16_t cur = reinterpret_cast<uint16_t*>(pDst_pixels)[x];
							cur = (cur & 0xF) | packed_colors[(s >> (x * 2)) & 3];
							reinterpret_cast<uint16_t*>(pDst_pixels)[x] = cur;
						}

						pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint16_t);
					}

					break;
				}
				case cRGBA4444_COLOR_OPAQUE:
				{
					assert(sizeof(uint16_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint16_t);

					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);

					color32 colors[4];
					decoder_etc_block::get_block_colors5(colors, pEndpoints->m_color5, pEndpoints->m_inten5);

					uint16_t packed_colors[4];
					for (uint32_t i = 0; i < 4; i++)
						packed_colors[i] = static_cast<uint16_t>(((colors[i].r >> 4) << 12) | ((colors[i].g >> 4) << 8) | ((colors[i].b >> 4) << 4) |  0xF);

					for (uint32_t y = 0; y < max_y; y++)
					{
						const uint32_t s = pSelector->m_selectors[y];

						for (uint32_t x = 0; x < max_x; x++)
							reinterpret_cast<uint16_t*>(pDst_pixels)[x] = packed_colors[(s >> (x * 2)) & 3];

						pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint16_t);
					}

					break;
				}
				case cRGBA4444_ALPHA:
				{
					assert(sizeof(uint16_t) == output_block_or_pixel_stride_in_bytes);
					uint8_t* pDst_pixels = static_cast<uint8_t*>(pDst_blocks) + (block_x * 4 + block_y * 4 * output_row_pitch_in_blocks_or_pixels) * sizeof(uint16_t);

					const uint32_t max_x = basisu::minimum<int>(4, output_row_pitch_in_blocks_or_pixels - block_x * 4);
					const uint32_t max_y = basisu::minimum<int>(4, output_rows_in_pixels - block_y * 4);

					color32 colors[4];
					decoder_etc_block::get_block_colors5(colors, pEndpoints->m_color5, pEndpoints->m_inten5);

					uint16_t packed_colors[4];
					for (uint32_t i = 0; i < 4; i++)
						packed_colors[i] = colors[i].g >> 4;

					for (uint32_t y = 0; y < max_y; y++)
					{
						const uint32_t s = pSelector->m_selectors[y];

						for (uint32_t x = 0; x < max_x; x++)
							reinterpret_cast<uint16_t*>(pDst_pixels)[x] = packed_colors[(s >> (x * 2)) & 3];

						pDst_pixels += output_row_pitch_in_blocks_or_pixels * sizeof(uint16_t);
					}

					break;
				}
				default:
				{
					assert(0);
					break;
				}
				}

			} // block_x

		} // block-y

		if (endpoint_pred_repeat_count != 0)
		{
			BASISU_DEVEL_ERROR("basisu_lowlevel_transcoder::transcode_slice: endpoint_pred_repeat_count != 0. The file is corrupted or this is a bug\n");
			return false;
		}

		//assert(endpoint_pred_repeat_count == 0);

#if BASISD_SUPPORT_PVRTC1
		// PVRTC post process - create per-pixel modulation values.
		if (fmt == cPVRTC1_4_RGB)
			fixup_pvrtc1_4_modulation_rgb((decoder_etc_block*)pPVRTC_work_mem, pPVRTC_endpoints, pDst_blocks, num_blocks_x, num_blocks_y, pvrtc_wrap_addressing);
		else if (fmt == cPVRTC1_4_RGBA)
			fixup_pvrtc1_4_modulation_rgba((decoder_etc_block*)pPVRTC_work_mem, pPVRTC_endpoints, pDst_blocks, num_blocks_x, num_blocks_y, pvrtc_wrap_addressing, pAlpha_blocks, &m_endpoints[0], &m_selectors[0]);
#endif // BASISD_SUPPORT_PVRTC1

		if (pPVRTC_work_mem)
			free(pPVRTC_work_mem);

		return true;
	}

	basisu_transcoder::basisu_transcoder(const etc1_global_selector_codebook* pGlobal_sel_codebook) :
		m_lowlevel_decoder(pGlobal_sel_codebook)
	{
	}

	bool basisu_transcoder::validate_file_checksums(const void* pData, uint32_t data_size, bool full_validation) const
	{
		if (!validate_header(pData, data_size))
			return false;

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);

#if !BASISU_NO_HEADER_OR_DATA_CRC16_CHECKS
		if (crc16(&pHeader->m_data_size, sizeof(basis_file_header) - BASISU_OFFSETOF(basis_file_header, m_data_size), 0) != pHeader->m_header_crc16)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: header CRC check failed\n");
			return false;
		}

		if (full_validation)
		{
			if (crc16(reinterpret_cast<const uint8_t*>(pData) + sizeof(basis_file_header), pHeader->m_data_size, 0) != pHeader->m_data_crc16)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: data CRC check failed\n");
				return false;
			}
		}
#endif		

		return true;
	}

	bool basisu_transcoder::validate_header_quick(const void* pData, uint32_t data_size) const
	{
		if (data_size <= sizeof(basis_file_header))
			return false;

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);

		if ((pHeader->m_sig != basis_file_header::cBASISSigValue) || (pHeader->m_ver != BASISD_SUPPORTED_BASIS_VERSION) || (pHeader->m_header_size != sizeof(basis_file_header)))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: header has an invalid signature, or file version is unsupported\n");
			return false;
		}

		uint32_t expected_file_size = sizeof(basis_file_header) + pHeader->m_data_size;
		if (data_size < expected_file_size)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: source buffer is too small\n");
			return false;
		}

		if ((!pHeader->m_total_slices) || (!pHeader->m_total_images))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::validate_header_quick: header is invalid\n");
			return false;
		}

		if ((pHeader->m_slice_desc_file_ofs >= data_size) ||
			((data_size - pHeader->m_slice_desc_file_ofs) < (sizeof(basis_slice_desc) * pHeader->m_total_slices))
			)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::validate_header_quick: passed in buffer is too small or data is corrupted\n");
			return false;
		}

		return true;
	}

	bool basisu_transcoder::validate_header(const void* pData, uint32_t data_size) const
	{
		if (data_size <= sizeof(basis_file_header))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: input source buffer is too small\n");
			return false;
		}

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);

		if ((pHeader->m_sig != basis_file_header::cBASISSigValue) || (pHeader->m_ver != BASISD_SUPPORTED_BASIS_VERSION) || (pHeader->m_header_size != sizeof(basis_file_header)))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: header has an invalid signature, or file version is unsupported\n");
			return false;
		}

		uint32_t expected_file_size = sizeof(basis_file_header) + pHeader->m_data_size;
		if (data_size < expected_file_size)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: input source buffer is too small, or header is corrupted\n");
			return false;
		}

		if ((!pHeader->m_total_images) || (!pHeader->m_total_slices))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: invalid basis file (total images or slices are 0)\n");
			return false;
		}

		if (pHeader->m_total_images > pHeader->m_total_slices)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: invalid basis file (too many images)\n");
			return false;
		}

		if (pHeader->m_flags & cBASISHeaderFlagHasAlphaSlices)
		{
			if (pHeader->m_total_slices & 1)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: invalid alpha basis file\n");
				return false;
			}
		}

		if ((pHeader->m_flags & cBASISHeaderFlagETC1S) == 0)
		{
			// We only support ETC1S in basis universal
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: invalid basis file (ETC1S flag check)\n");
			return false;
		}

		if ((pHeader->m_slice_desc_file_ofs >= data_size) ||
			((data_size - pHeader->m_slice_desc_file_ofs) < (sizeof(basis_slice_desc) * pHeader->m_total_slices))
			)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::validate_header_quick: passed in buffer is too small or data is corrupted\n");
			return false;
		}

		return true;
	}

	basis_texture_type basisu_transcoder::get_texture_type(const void* pData, uint32_t data_size) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_texture_type: header validation failed\n");
			return cBASISTexType2DArray;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		basis_texture_type btt = static_cast<basis_texture_type>(static_cast<uint8_t>(pHeader->m_tex_type));

		if (btt >= cBASISTexTypeTotal)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::validate_header_quick: header's texture type field is invalid\n");
			return cBASISTexType2DArray;
		}

		return btt;
	}

	bool basisu_transcoder::get_userdata(const void* pData, uint32_t data_size, uint32_t& userdata0, uint32_t& userdata1) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_userdata: header validation failed\n");
			return false;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		userdata0 = pHeader->m_userdata0;
		userdata1 = pHeader->m_userdata1;
		return true;
	}

	uint32_t basisu_transcoder::get_total_images(const void* pData, uint32_t data_size) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_images: header validation failed\n");
			return 0;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		return pHeader->m_total_images;
	}

	bool basisu_transcoder::get_image_info(const void* pData, uint32_t data_size, basisu_image_info& image_info, uint32_t image_index) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_info: header validation failed\n");
			return false;
		}

		int slice_index = find_first_slice_index(pData, data_size, image_index, 0);
		if (slice_index < 0)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_info: invalid slice index\n");
			return false;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		if (image_index >= pHeader->m_total_images)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_info: invalid image_index\n");
			return false;
		}

		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(static_cast<const uint8_t*>(pData) + pHeader->m_slice_desc_file_ofs);

		uint32_t total_levels = 1;
		for (uint32_t i = slice_index + 1; i < pHeader->m_total_slices; i++)
			if (pSlice_descs[i].m_image_index == image_index)
				total_levels = basisu::maximum<uint32_t>(total_levels, pSlice_descs[i].m_level_index + 1);
			else
				break;

		if (total_levels > 16)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_info: invalid image_index\n");
			return false;
		}

		const basis_slice_desc& slice_desc = pSlice_descs[slice_index];

		image_info.m_image_index = image_index;
		image_info.m_total_levels = total_levels;
		image_info.m_alpha_flag = (pHeader->m_flags & cBASISHeaderFlagHasAlphaSlices) != 0;
		image_info.m_iframe_flag = (slice_desc.m_flags & cSliceDescFlagsFrameIsIFrame) != 0;
		image_info.m_width = slice_desc.m_num_blocks_x * 4;
		image_info.m_height = slice_desc.m_num_blocks_y * 4;
		image_info.m_orig_width = slice_desc.m_orig_width;
		image_info.m_orig_height = slice_desc.m_orig_height;
		image_info.m_num_blocks_x = slice_desc.m_num_blocks_x;
		image_info.m_num_blocks_y = slice_desc.m_num_blocks_y;
		image_info.m_total_blocks = image_info.m_num_blocks_x * image_info.m_num_blocks_y;
		image_info.m_first_slice_index = slice_index;

		return true;
	}

	uint32_t basisu_transcoder::get_total_image_levels(const void* pData, uint32_t data_size, uint32_t image_index) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_image_levels: header validation failed\n");
			return false;
		}

		int slice_index = find_first_slice_index(pData, data_size, image_index, 0);
		if (slice_index < 0)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_image_levels: failed finding slice\n");
			return false;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		if (image_index >= pHeader->m_total_images)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_image_levels: invalid image_index\n");
			return false;
		}

		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(static_cast<const uint8_t*>(pData) + pHeader->m_slice_desc_file_ofs);

		uint32_t total_levels = 1;
		for (uint32_t i = slice_index + 1; i < pHeader->m_total_slices; i++)
			if (pSlice_descs[i].m_image_index == image_index)
				total_levels = basisu::maximum<uint32_t>(total_levels, pSlice_descs[i].m_level_index + 1);
			else
				break;

		const uint32_t cMaxSupportedLevels = 16;
		if (total_levels > cMaxSupportedLevels)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_total_image_levels: invalid image levels!\n");
			return false;
		}

		return total_levels;
	}

	bool basisu_transcoder::get_image_level_desc(const void* pData, uint32_t data_size, uint32_t image_index, uint32_t level_index, uint32_t& orig_width, uint32_t& orig_height, uint32_t& total_blocks) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_level_desc: header validation failed\n");
			return false;
		}

		int slice_index = find_first_slice_index(pData, data_size, image_index, level_index);
		if (slice_index < 0)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_level_desc: failed finding slice\n");
			return false;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		if (image_index >= pHeader->m_total_images)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_level_desc: invalid image_index\n");
			return false;
		}

		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(static_cast<const uint8_t*>(pData) + pHeader->m_slice_desc_file_ofs);

		const basis_slice_desc& slice_desc = pSlice_descs[slice_index];

		orig_width = slice_desc.m_orig_width;
		orig_height = slice_desc.m_orig_height;
		total_blocks = slice_desc.m_num_blocks_x * slice_desc.m_num_blocks_y;

		return true;
	}

	bool basisu_transcoder::get_image_level_info(const void* pData, uint32_t data_size, basisu_image_level_info& image_info, uint32_t image_index, uint32_t level_index) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_level_info: validate_file_checksums failed\n");
			return false;
		}

		int slice_index = find_first_slice_index(pData, data_size, image_index, level_index);
		if (slice_index < 0)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_level_info: failed finding slice\n");
			return false;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);

		if (image_index >= pHeader->m_total_images)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_image_level_info: invalid image_index\n");
			return false;
		}

		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(static_cast<const uint8_t*>(pData) + pHeader->m_slice_desc_file_ofs);

		const basis_slice_desc& slice_desc = pSlice_descs[slice_index];

		image_info.m_image_index = image_index;
		image_info.m_level_index = level_index;
		image_info.m_alpha_flag = (pHeader->m_flags & cBASISHeaderFlagHasAlphaSlices) != 0;
		image_info.m_iframe_flag = (slice_desc.m_flags & cSliceDescFlagsFrameIsIFrame) != 0;
		image_info.m_width = slice_desc.m_num_blocks_x * 4;
		image_info.m_height = slice_desc.m_num_blocks_y * 4;
		image_info.m_orig_width = slice_desc.m_orig_width;
		image_info.m_orig_height = slice_desc.m_orig_height;
		image_info.m_num_blocks_x = slice_desc.m_num_blocks_x;
		image_info.m_num_blocks_y = slice_desc.m_num_blocks_y;
		image_info.m_total_blocks = image_info.m_num_blocks_x * image_info.m_num_blocks_y;
		image_info.m_first_slice_index = slice_index;

		return true;
	}

	bool basisu_transcoder::get_file_info(const void* pData, uint32_t data_size, basisu_file_info& file_info) const
	{
		if (!validate_file_checksums(pData, data_size, false))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_file_info: validate_file_checksums failed\n");
			return false;
		}

		const basis_file_header* pHeader = static_cast<const basis_file_header*>(pData);
		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(static_cast<const uint8_t*>(pData) + pHeader->m_slice_desc_file_ofs);

		file_info.m_version = pHeader->m_ver;

		file_info.m_total_header_size = sizeof(basis_file_header) + pHeader->m_total_slices * sizeof(basis_slice_desc);

		file_info.m_total_selectors = pHeader->m_total_selectors;
		file_info.m_selector_codebook_size = pHeader->m_selector_cb_file_size;

		file_info.m_total_endpoints = pHeader->m_total_endpoints;
		file_info.m_endpoint_codebook_size = pHeader->m_endpoint_cb_file_size;

		file_info.m_tables_size = pHeader->m_tables_file_size;

		file_info.m_etc1s = (pHeader->m_flags & cBASISHeaderFlagETC1S) != 0;
		file_info.m_y_flipped = (pHeader->m_flags & cBASISHeaderFlagYFlipped) != 0;
		file_info.m_has_alpha_slices = (pHeader->m_flags & cBASISHeaderFlagHasAlphaSlices) != 0;

		const uint32_t total_slices = pHeader->m_total_slices;

		file_info.m_slice_info.resize(total_slices);

		file_info.m_slices_size = 0;

		file_info.m_tex_type = static_cast<basis_texture_type>(static_cast<uint8_t>(pHeader->m_tex_type));

		if (file_info.m_tex_type > cBASISTexTypeTotal)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::get_file_info: invalid texture type, file is corrupted\n");
			return false;
		}

		file_info.m_us_per_frame = pHeader->m_us_per_frame;
		file_info.m_userdata0 = pHeader->m_userdata0;
		file_info.m_userdata1 = pHeader->m_userdata1;

		file_info.m_image_mipmap_levels.resize(0);
		file_info.m_image_mipmap_levels.resize(pHeader->m_total_images);

		file_info.m_total_images = pHeader->m_total_images;

		for (uint32_t i = 0; i < total_slices; i++)
		{
			file_info.m_slices_size += pSlice_descs[i].m_file_size;

			basisu_slice_info& slice_info = file_info.m_slice_info[i];

			slice_info.m_orig_width = pSlice_descs[i].m_orig_width;
			slice_info.m_orig_height = pSlice_descs[i].m_orig_height;
			slice_info.m_width = pSlice_descs[i].m_num_blocks_x * 4;
			slice_info.m_height = pSlice_descs[i].m_num_blocks_y * 4;
			slice_info.m_num_blocks_x = pSlice_descs[i].m_num_blocks_x;
			slice_info.m_num_blocks_y = pSlice_descs[i].m_num_blocks_y;
			slice_info.m_total_blocks = slice_info.m_num_blocks_x * slice_info.m_num_blocks_y;
			slice_info.m_compressed_size = pSlice_descs[i].m_file_size;
			slice_info.m_slice_index = i;
			slice_info.m_image_index = pSlice_descs[i].m_image_index;
			slice_info.m_level_index = pSlice_descs[i].m_level_index;
			slice_info.m_unpacked_slice_crc16 = pSlice_descs[i].m_slice_data_crc16;
			slice_info.m_alpha_flag = (pSlice_descs[i].m_flags & cSliceDescFlagsIsAlphaData) != 0;
			slice_info.m_iframe_flag = (pSlice_descs[i].m_flags & cSliceDescFlagsFrameIsIFrame) != 0;

			if (pSlice_descs[i].m_image_index >= pHeader->m_total_images)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::get_file_info: slice desc's image index is invalid\n");
				return false;
			}

			file_info.m_image_mipmap_levels[pSlice_descs[i].m_image_index] = basisu::maximum<uint32_t>(file_info.m_image_mipmap_levels[pSlice_descs[i].m_image_index], pSlice_descs[i].m_level_index + 1);

			if (file_info.m_image_mipmap_levels[pSlice_descs[i].m_image_index] > 16)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::get_file_info: slice mipmap level is invalid\n");
				return false;
			}
		}

		return true;
	}

	bool basisu_transcoder::start_transcoding(const void* pData, uint32_t data_size) const
	{
		if (m_lowlevel_decoder.m_endpoints.size())
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: already called start_transcoding\n");
			return true;
		}

		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: header validation failed\n");
			return false;
		}

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);

		const uint8_t* pDataU8 = static_cast<const uint8_t*>(pData);

		if (!pHeader->m_endpoint_cb_file_size || !pHeader->m_selector_cb_file_size || !pHeader->m_tables_file_size)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: file is corrupted (0)\n");
		}

		if ((pHeader->m_endpoint_cb_file_ofs > data_size) || (pHeader->m_selector_cb_file_ofs > data_size) || (pHeader->m_tables_file_ofs > data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: file is corrupted or passed in buffer too small (1)\n");
			return false;
		}

		if (pHeader->m_endpoint_cb_file_size > (data_size - pHeader->m_endpoint_cb_file_ofs))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: file is corrupted or passed in buffer too small (2)\n");
			return false;
		}

		if (pHeader->m_selector_cb_file_size > (data_size - pHeader->m_selector_cb_file_ofs))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: file is corrupted or passed in buffer too small (3)\n");
			return false;
		}

		if (pHeader->m_tables_file_size > (data_size - pHeader->m_tables_file_ofs))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: file is corrupted or passed in buffer too small (3)\n");
			return false;
		}

		if (!m_lowlevel_decoder.decode_palettes(
			pHeader->m_total_endpoints, pDataU8 + pHeader->m_endpoint_cb_file_ofs, pHeader->m_endpoint_cb_file_size,
			pHeader->m_total_selectors, pDataU8 + pHeader->m_selector_cb_file_ofs, pHeader->m_selector_cb_file_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: decode_palettes failed\n");
			return false;
		}

		if (!m_lowlevel_decoder.decode_tables(pDataU8 + pHeader->m_tables_file_ofs, pHeader->m_tables_file_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::start_transcoding: decode_tables failed\n");
			return false;
		}

		return true;
	}

	bool basisu_transcoder::transcode_slice(const void* pData, uint32_t data_size, uint32_t slice_index, void* pOutput_blocks, uint32_t output_blocks_buf_size_in_blocks_or_pixels, block_format fmt,
		uint32_t output_block_or_pixel_stride_in_bytes, uint32_t decode_flags, uint32_t output_row_pitch_in_blocks_or_pixels, basisu_transcoder_state* pState, void *pAlpha_blocks, uint32_t output_rows_in_pixels) const
	{
		if (!m_lowlevel_decoder.m_endpoints.size())
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: must call start_transcoding first\n");
			return false;
		}

		if (decode_flags & cDecodeFlagsPVRTCDecodeToNextPow2)
		{
			// TODO: Not yet supported
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: cDecodeFlagsPVRTCDecodeToNextPow2 currently unsupported\n");
			return false;
		}

		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: header validation failed\n");
			return false;
		}

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);

		const uint8_t* pDataU8 = static_cast<const uint8_t*>(pData);

		if (slice_index >= pHeader->m_total_slices)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: slice_index >= pHeader->m_total_slices\n");
			return false;
		}

		const basis_slice_desc& slice_desc = reinterpret_cast<const basis_slice_desc*>(pDataU8 + pHeader->m_slice_desc_file_ofs)[slice_index];

		uint32_t total_blocks = slice_desc.m_num_blocks_x * slice_desc.m_num_blocks_y;
		
		if (basis_block_format_is_uncompressed(fmt))
		{
			// Assume the output buffer is orig_width by orig_height
			if (!output_row_pitch_in_blocks_or_pixels)
				output_row_pitch_in_blocks_or_pixels = slice_desc.m_orig_width;

			if (!output_rows_in_pixels)
				output_rows_in_pixels = slice_desc.m_orig_height;

			// Now make sure the output buffer is large enough, or we'll overwrite memory.
			if (output_blocks_buf_size_in_blocks_or_pixels < (output_rows_in_pixels * output_row_pitch_in_blocks_or_pixels))
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: output_blocks_buf_size_in_blocks_or_pixels < (output_rows_in_pixels * output_row_pitch_in_blocks_or_pixels)\n");
				return false;
			}
		}
		else
		{
			if (output_blocks_buf_size_in_blocks_or_pixels < total_blocks)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: output_blocks_buf_size_in_blocks_or_pixels < total_blocks\n");
				return false;
			}
		}

		if (fmt != cETC1)
		{
			if ((fmt == cPVRTC1_4_RGB) || (fmt == cPVRTC1_4_RGBA))
			{
				if ((!basisu::is_pow2(slice_desc.m_num_blocks_x * 4)) || (!basisu::is_pow2(slice_desc.m_num_blocks_y * 4)))
				{
					// PVRTC1 only supports power of 2 dimensions
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: PVRTC1 only supports power of 2 dimensions\n");
					return false;
				}
			}
		}

		if (slice_desc.m_file_ofs > data_size)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: invalid slice_desc.m_file_ofs, or passed in buffer too small\n");
			return false;
		}

		const uint32_t data_size_left = data_size - slice_desc.m_file_ofs;
		if (data_size_left < slice_desc.m_file_size)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_slice: invalid slice_desc.m_file_size, or passed in buffer too small\n");
			return false;
		}

		return m_lowlevel_decoder.transcode_slice(pOutput_blocks, slice_desc.m_num_blocks_x, slice_desc.m_num_blocks_y,
			pDataU8 + slice_desc.m_file_ofs, slice_desc.m_file_size,
			fmt, output_block_or_pixel_stride_in_bytes, (decode_flags & cDecodeFlagsPVRTCWrapAddressing) != 0, (decode_flags & cDecodeFlagsBC1ForbidThreeColorBlocks) == 0, *pHeader, slice_desc, output_row_pitch_in_blocks_or_pixels, pState,
			(decode_flags & cDecodeFlagsOutputHasAlphaIndices) != 0, pAlpha_blocks, output_rows_in_pixels);
	}

	int basisu_transcoder::find_first_slice_index(const void* pData, uint32_t data_size, uint32_t image_index, uint32_t level_index) const
	{
		(void)data_size;

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);
		const uint8_t* pDataU8 = static_cast<const uint8_t*>(pData);

		// For very large basis files this search could be painful
		// TODO: Binary search this
		for (uint32_t slice_iter = 0; slice_iter < pHeader->m_total_slices; slice_iter++)
		{
			const basis_slice_desc& slice_desc = reinterpret_cast<const basis_slice_desc*>(pDataU8 + pHeader->m_slice_desc_file_ofs)[slice_iter];
			if ((slice_desc.m_image_index == image_index) && (slice_desc.m_level_index == level_index))
				return slice_iter;
		}

		BASISU_DEVEL_ERROR("basisu_transcoder::find_first_slice_index: didn't find slice\n");

		return -1;
	}

	int basisu_transcoder::find_slice(const void* pData, uint32_t data_size, uint32_t image_index, uint32_t level_index, bool alpha_data) const
	{
		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::find_slice: header validation failed\n");
			return false;
		}

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);
		const uint8_t* pDataU8 = static_cast<const uint8_t*>(pData);
		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(pDataU8 + pHeader->m_slice_desc_file_ofs);

		// For very large basis files this search could be painful
		// TODO: Binary search this
		for (uint32_t slice_iter = 0; slice_iter < pHeader->m_total_slices; slice_iter++)
		{
			const basis_slice_desc& slice_desc = pSlice_descs[slice_iter];
			if ((slice_desc.m_image_index == image_index) && (slice_desc.m_level_index == level_index))
			{
				const bool slice_alpha = (slice_desc.m_flags & cSliceDescFlagsIsAlphaData) != 0;
				if (slice_alpha == alpha_data)
					return slice_iter;
			}
		}

		BASISU_DEVEL_ERROR("basisu_transcoder::find_slice: didn't find slice\n");

		return -1;
	}

	static void write_opaque_alpha_blocks(
		uint32_t num_blocks_x, uint32_t num_blocks_y,
		void* pOutput_blocks, uint32_t output_blocks_buf_size_in_blocks_or_pixels, block_format fmt,
		uint32_t block_stride_in_bytes, uint32_t output_row_pitch_in_blocks_or_pixels)
	{
		BASISU_NOTE_UNUSED(output_blocks_buf_size_in_blocks_or_pixels);

		if (!output_row_pitch_in_blocks_or_pixels)
			output_row_pitch_in_blocks_or_pixels = num_blocks_x;

		if (fmt == cETC2_EAC_A8)
		{
#if BASISD_SUPPORT_ETC2_EAC_A8
			eac_a8_block blk;
			blk.m_base = 255;
			blk.m_multiplier = 1;
			blk.m_table = 13;

			// Selectors are all 4's
			static const uint8_t s_etc2_eac_a8_sel4[6] = { 0x92, 0x49, 0x24, 0x92, 0x49, 0x24 };
			memcpy(&blk.m_selectors, s_etc2_eac_a8_sel4, sizeof(s_etc2_eac_a8_sel4));

			for (uint32_t y = 0; y < num_blocks_y; y++)
			{
				uint32_t dst_ofs = y * output_row_pitch_in_blocks_or_pixels * block_stride_in_bytes;
				for (uint32_t x = 0; x < num_blocks_x; x++)
				{
					memcpy((uint8_t*)pOutput_blocks + dst_ofs, &blk, sizeof(blk));
					dst_ofs += block_stride_in_bytes;
				}
			}
#endif
		}
		else if (fmt == cBC4)
		{
#if BASISD_SUPPORT_DXT5A
			dxt5a_block blk;
			blk.m_endpoints[0] = 255;
			blk.m_endpoints[1] = 255;
			memset(blk.m_selectors, 0, sizeof(blk.m_selectors));

			for (uint32_t y = 0; y < num_blocks_y; y++)
			{
				uint32_t dst_ofs = y * output_row_pitch_in_blocks_or_pixels * block_stride_in_bytes;
				for (uint32_t x = 0; x < num_blocks_x; x++)
				{
					memcpy((uint8_t*)pOutput_blocks + dst_ofs, &blk, sizeof(blk));
					dst_ofs += block_stride_in_bytes;
				}
			}
#endif
		}
	}

	bool basisu_transcoder::transcode_image_level(
		const void* pData, uint32_t data_size,
		uint32_t image_index, uint32_t level_index,
		void* pOutput_blocks, uint32_t output_blocks_buf_size_in_blocks_or_pixels,
		transcoder_texture_format fmt,
		uint32_t decode_flags, uint32_t output_row_pitch_in_blocks_or_pixels, basisu_transcoder_state *pState, uint32_t output_rows_in_pixels) const
	{
		const uint32_t bytes_per_block = basis_get_bytes_per_block(fmt);

		if (!m_lowlevel_decoder.m_endpoints.size())
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: must call start_transcoding() first\n");
			return false;
		}

		const bool transcode_alpha_data_to_opaque_formats = (decode_flags & cDecodeFlagsTranscodeAlphaDataToOpaqueFormats) != 0;

		if (decode_flags & cDecodeFlagsPVRTCDecodeToNextPow2)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: cDecodeFlagsPVRTCDecodeToNextPow2 currently unsupported\n");
			// TODO: Not yet supported
			return false;
		}

		if (!validate_header_quick(pData, data_size))
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: header validation failed\n");
			return false;
		}

		const basis_file_header* pHeader = reinterpret_cast<const basis_file_header*>(pData);

		const uint8_t* pDataU8 = static_cast<const uint8_t*>(pData);

		const basis_slice_desc* pSlice_descs = reinterpret_cast<const basis_slice_desc*>(pDataU8 + pHeader->m_slice_desc_file_ofs);

		const bool basis_file_has_alpha_slices = (pHeader->m_flags & cBASISHeaderFlagHasAlphaSlices) != 0;

		int slice_index = find_first_slice_index(pData, data_size, image_index, level_index);
		if (slice_index < 0)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: failed finding slice index\n");
			// Unable to find the requested image/level 
			return false;
		}

		if ((fmt == cTFPVRTC1_4_RGBA) && (!basis_file_has_alpha_slices))
		{
			// Switch to PVRTC1 RGB if the input doesn't have alpha.
			fmt = cTFPVRTC1_4_RGB;
		}
				
		if (pSlice_descs[slice_index].m_flags & cSliceDescFlagsIsAlphaData)
		{
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: alpha basis file has out of order alpha slice\n");

			// The first slice shouldn't have alpha data in a properly formed basis file
			return false;
		}

		if (basis_file_has_alpha_slices)
		{
			// The alpha data should immediately follow the color data, and have the same resolution.
			if ((slice_index + 1U) >= pHeader->m_total_slices)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: alpha basis file has missing alpha slice\n");
				// basis file is missing the alpha slice
				return false;
			}

			// Basic sanity checks
			if ((pSlice_descs[slice_index + 1].m_flags & cSliceDescFlagsIsAlphaData) == 0)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: alpha basis file has missing alpha slice (flag check)\n");
				// This slice should have alpha data
				return false;
			}

			if ((pSlice_descs[slice_index].m_num_blocks_x != pSlice_descs[slice_index + 1].m_num_blocks_x) || (pSlice_descs[slice_index].m_num_blocks_y != pSlice_descs[slice_index + 1].m_num_blocks_y))
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: alpha basis file slice dimensions bad\n");
				// Alpha slice should have been the same res as the color slice
				return false;
			}
		}
								
		bool status = false;

		const uint32_t total_slice_blocks = pSlice_descs[slice_index].m_num_blocks_x * pSlice_descs[slice_index].m_num_blocks_y;

		if (((fmt == cTFPVRTC1_4_RGB) || (fmt == cTFPVRTC1_4_RGBA)) && (output_blocks_buf_size_in_blocks_or_pixels > total_slice_blocks))
		{
			// The transcoder doesn't write beyond total_slice_blocks, so we need to clear the rest ourselves.
			// For GL usage, PVRTC1 4bpp image size is (max(width, 8)* max(height, 8) * 4 + 7) / 8. 
			// However, for KTX and internally in Basis this formula isn't used, it's just ((width+3)/4) * ((height+3)/4) * bytes_per_block. This is all the transcoder actually writes to memory.
			memset(static_cast<uint8_t*>(pOutput_blocks) + total_slice_blocks * bytes_per_block, 0, (output_blocks_buf_size_in_blocks_or_pixels - total_slice_blocks) * bytes_per_block);
		}
				
		switch (fmt)
		{
		case cTFETC1:
		{
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cETC1, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to ETC1 failed\n");
			}
			break;
		}
		case cTFBC1:
		{
#if !BASISD_SUPPORT_DXT1
			return false;
#endif
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC1, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC1 failed\n");
			}
			break;
		}
		case cTFBC4:
		{
#if !BASISD_SUPPORT_DXT5A
			return false;
#endif
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC4, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC4 failed\n");
			}
			break;
		}
		case cTFPVRTC1_4_RGB:
		{
#if !BASISD_SUPPORT_PVRTC1
			return false;
#endif
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			// output_row_pitch_in_blocks_or_pixels is actually ignored because we're transcoding to PVRTC1. (Print a dev warning if it's != 0?)
			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cPVRTC1_4_RGB, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to PVRTC1 4 RGB failed\n");
			}
			break;
		}
		case cTFPVRTC1_4_RGBA:
		{
#if !BASISD_SUPPORT_PVRTC1
			return false;
#endif
			assert(basis_file_has_alpha_slices);

			// Temp buffer to hold alpha block endpoint/selector indices
			std::vector<uint32_t> temp_block_indices(total_slice_blocks);

			// First transcode alpha data to temp buffer
			status = transcode_slice(pData, data_size, slice_index + 1, &temp_block_indices[0], total_slice_blocks, cIndices, sizeof(uint32_t), decode_flags, pSlice_descs[slice_index].m_num_blocks_x, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to PVRTC1 4 RGBA failed (0)\n");
			}
			else
			{
				// output_row_pitch_in_blocks_or_pixels is actually ignored because we're transcoding to PVRTC1. (Print a dev warning if it's != 0?)
				status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cPVRTC1_4_RGBA, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState, &temp_block_indices[0]);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to PVRTC1 4 RGBA failed (1)\n");
				}
			}

			break;
		}
		case cTFBC7_M6_OPAQUE_ONLY:
		{
#if !BASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY
			return false;
#endif
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC7_M6_OPAQUE_ONLY, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC7 m6 opaque only failed\n");
			}
			break;
		}
		case cTFBC7_M5:
		{
#if !BASISD_SUPPORT_BC7_MODE5
			return false;
#else
			// First transcode the color slice. The cBC7_M5_COLOR transcoder will output opaque mode 5 blocks.
			status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC7_M5_COLOR, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);

			if ((status) && (basis_file_has_alpha_slices))
			{
				// Now transcode the alpha slice. The cBC7_M5_ALPHA transcoder will now change the opaque mode 5 blocks to blocks with alpha.
				status = transcode_slice(pData, data_size, slice_index + 1, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC7_M5_ALPHA, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			}

			break;
#endif
		}
		case cTFETC2:
		{
#if !BASISD_SUPPORT_ETC2_EAC_A8
			return false;
#endif
			if (basis_file_has_alpha_slices)
			{
				// First decode the alpha data 
				status = transcode_slice(pData, data_size, slice_index + 1, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cETC2_EAC_A8, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			}
			else
			{
				write_opaque_alpha_blocks(pSlice_descs[slice_index].m_num_blocks_x, pSlice_descs[slice_index].m_num_blocks_y, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cETC2_EAC_A8, 16, output_row_pitch_in_blocks_or_pixels);
				status = true;
			}

			if (status)
			{
				// Now decode the color data
				status = transcode_slice(pData, data_size, slice_index, (uint8_t*)pOutput_blocks + 8, output_blocks_buf_size_in_blocks_or_pixels, cETC1, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to ETC2 RGB failed\n");
				}
			}
			else
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to ETC2 A failed\n");
			}
			break;
		}
		case cTFBC3:
		{
#if !BASISD_SUPPORT_DXT1
			return false;
#endif
#if !BASISD_SUPPORT_DXT5A
			return false;
#endif
			// First decode the alpha data 
			if (basis_file_has_alpha_slices)
			{
				status = transcode_slice(pData, data_size, slice_index + 1, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			}
			else
			{
				write_opaque_alpha_blocks(pSlice_descs[slice_index].m_num_blocks_x, pSlice_descs[slice_index].m_num_blocks_y, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, output_row_pitch_in_blocks_or_pixels);
				status = true;
			}

			if (status)
			{
				// Now decode the color data. Forbid 3 color blocks, which aren't allowed in BC3.
				status = transcode_slice(pData, data_size, slice_index, (uint8_t*)pOutput_blocks + 8, output_blocks_buf_size_in_blocks_or_pixels, cBC1, 16, decode_flags | cDecodeFlagsBC1ForbidThreeColorBlocks, output_row_pitch_in_blocks_or_pixels, pState);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC3 RGB failed\n");
				}
			}
			else
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC3 A failed\n");
			}

			break;
		}
		case cTFBC5:
		{
#if !BASISD_SUPPORT_DXT5A
			return false;
#endif
			// Decode the R data (actually the green channel of the color data slice in the basis file)
			status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (status)
			{
				if (basis_file_has_alpha_slices)
				{
					// Decode the G data (actually the green channel of the alpha data slice in the basis file)
					status = transcode_slice(pData, data_size, slice_index + 1, (uint8_t*)pOutput_blocks + 8, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
					if (!status)
					{
						BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC5 1 failed\n");
					}
				}
				else
				{
					write_opaque_alpha_blocks(pSlice_descs[slice_index].m_num_blocks_x, pSlice_descs[slice_index].m_num_blocks_y, (uint8_t*)pOutput_blocks + 8, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, output_row_pitch_in_blocks_or_pixels);
					status = true;
				}
			}
			else
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to BC5 channel 0 failed\n");
			}
			break;
		}
		case cTFASTC_4x4:
		{
#if !BASISD_SUPPORT_ASTC
			return false;
#endif
			if (basis_file_has_alpha_slices)
			{
				// First decode the alpha data to the output (we're using the output texture as a temp buffer here).
				status = transcode_slice(pData, data_size, slice_index + 1, (uint8_t*)pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cIndices, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to failed\n");
				}
				else
				{
					// Now decode the color data and transcode to ASTC. The transcoder function will read the alpha selector data from the output texture as it converts and
					// transcode both the alpha and color data at the same time to ASTC.
					status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cASTC_4x4, 16, decode_flags | cDecodeFlagsOutputHasAlphaIndices, output_row_pitch_in_blocks_or_pixels, pState);
				}
			}
			else
				status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cASTC_4x4, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);

			break;
		}
		case cTFATC_RGB:
		{
#if !BASISD_SUPPORT_ATC
			return false;
#endif
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cATC_RGB, bytes_per_block, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to ATC_RGB failed\n");
			}
			break;
		}
		case cTFATC_RGBA_INTERPOLATED_ALPHA:
		{
#if !BASISD_SUPPORT_ATC
			return false;
#endif
#if !BASISD_SUPPORT_DXT5A
			return false;
#endif
			// First decode the alpha data 
			if (basis_file_has_alpha_slices)
			{
				status = transcode_slice(pData, data_size, slice_index + 1, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
			}
			else
			{
				write_opaque_alpha_blocks(pSlice_descs[slice_index].m_num_blocks_x, pSlice_descs[slice_index].m_num_blocks_y, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cBC4, 16, output_row_pitch_in_blocks_or_pixels);
				status = true;
			}

			if (status)
			{
				status = transcode_slice(pData, data_size, slice_index, (uint8_t*)pOutput_blocks + 8, output_blocks_buf_size_in_blocks_or_pixels, cATC_RGB, 16, decode_flags, output_row_pitch_in_blocks_or_pixels, pState);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to ATC RGB failed\n");
				}
			}
			else
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to ATC A failed\n");
			}

			break;
		}
		case cTFRGBA32:
		{
			// Raw 32bpp pixels, decoded in the usual raster order (NOT block order) into an image in memory.

			// First decode the alpha data 
			if (basis_file_has_alpha_slices)
				status = transcode_slice(pData, data_size, slice_index + 1, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cA32, sizeof(uint32_t), decode_flags, output_row_pitch_in_blocks_or_pixels, pState, nullptr, output_rows_in_pixels);
			else
				status = true;

			if (status)
			{
				status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, basis_file_has_alpha_slices ? cRGB32 : cRGBA32, sizeof(uint32_t), decode_flags, output_row_pitch_in_blocks_or_pixels, pState, nullptr, output_rows_in_pixels);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to RGBA32 RGB failed\n");
				}
			}
			else
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to RGBA32 A failed\n");
			}

			break;
		}
		case cTFRGB565:
		case cTFBGR565:
		{
			// Raw 16bpp pixels, decoded in the usual raster order (NOT block order) into an image in memory.
			
			uint32_t slice_index_to_decode = slice_index;
			// If the caller wants us to transcode the mip level's alpha data, then use the next slice.
			if ((basis_file_has_alpha_slices) && (transcode_alpha_data_to_opaque_formats))
				slice_index_to_decode++;

			status = transcode_slice(pData, data_size, slice_index_to_decode, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, (fmt == cTFRGB565) ? cRGB565 : cBGR565, sizeof(uint16_t), decode_flags, output_row_pitch_in_blocks_or_pixels, pState, nullptr, output_rows_in_pixels);
			if (!status)
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to RGB565 RGB failed\n");
			}

			break;
		}
		case cTFRGBA4444:
		{
			// Raw 16bpp pixels, decoded in the usual raster order (NOT block order) into an image in memory.

			// First decode the alpha data 
			if (basis_file_has_alpha_slices)
				status = transcode_slice(pData, data_size, slice_index + 1, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, cRGBA4444_ALPHA, sizeof(uint16_t), decode_flags, output_row_pitch_in_blocks_or_pixels, pState, nullptr, output_rows_in_pixels);
			else
				status = true;

			if (status)
			{
				status = transcode_slice(pData, data_size, slice_index, pOutput_blocks, output_blocks_buf_size_in_blocks_or_pixels, basis_file_has_alpha_slices ? cRGBA4444_COLOR : cRGBA4444_COLOR_OPAQUE, sizeof(uint16_t), decode_flags, output_row_pitch_in_blocks_or_pixels, pState, nullptr, output_rows_in_pixels);
				if (!status)
				{
					BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to RGBA4444 RGB failed\n");
				}
			}
			else
			{
				BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: transcode_slice() to RGBA4444 A failed\n");
			}

			break;
		}
		default:
		{
			assert(0);
			BASISU_DEVEL_ERROR("basisu_transcoder::transcode_image_level: Invalid fmt\n");
			break;
		}
		}

		return status;
	}

	uint32_t basis_get_bytes_per_block(transcoder_texture_format fmt)
	{
		switch (fmt)
		{
		case cTFETC1:
		case cTFBC1:
		case cTFBC4:
		case cTFPVRTC1_4_RGB:
		case cTFPVRTC1_4_RGBA:
		case cTFATC_RGB:
			return 8;
		case cTFBC7_M6_OPAQUE_ONLY:
		case cTFBC7_M5:
		case cTFETC2:
		case cTFBC3:
		case cTFBC5:
		case cTFASTC_4x4:
		case cTFATC_RGBA_INTERPOLATED_ALPHA:
			return 16;
		case cTFRGBA32:
			return sizeof(uint32_t) * 16;
		case cTFRGB565:
		case cTFBGR565:
		case cTFRGBA4444:
			return sizeof(uint16_t) * 16;
		default:
			assert(0);
			BASISU_DEVEL_ERROR("basis_get_basisu_texture_format: Invalid fmt\n");
			break;
		}
		return 0;
	}

	const char* basis_get_format_name(transcoder_texture_format fmt)
	{
		switch (fmt)
		{
		case cTFETC1: return "ETC1";
		case cTFBC1: return "BC1";
		case cTFBC4: return "BC4";
		case cTFPVRTC1_4_RGB: return "PVRTC1_4_RGB";
		case cTFPVRTC1_4_RGBA: return "PVRTC1_4_RGBA";
		case cTFBC7_M6_OPAQUE_ONLY: return "BC7_M6_OPAQUE_ONLY";
		case cTFBC7_M5: return "BC7_M5";
		case cTFETC2: return "ETC2";
		case cTFBC3: return "BC3";
		case cTFBC5: return "BC5";
		case cTFASTC_4x4: return "ASTC";
		case cTFATC_RGB: return "ATC_RGB";
		case cTFATC_RGBA_INTERPOLATED_ALPHA: return "ATC_RGBA_INTERPOLATED_ALPHA";
		case cTFRGBA32: return "RGBA32";
		case cTFRGB565: return "RGB565";
		case cTFBGR565: return "BGR565";
		case cTFRGBA4444: return "RGBA4444";
		default:
			assert(0);
			BASISU_DEVEL_ERROR("basis_get_basisu_texture_format: Invalid fmt\n");
			break;
		}
		return "";
	}

	const char* basis_get_texture_type_name(basis_texture_type tex_type)
	{
		switch (tex_type)
		{
		case cBASISTexType2D: return "2D";
		case cBASISTexType2DArray: return "2D array";
		case cBASISTexTypeCubemapArray: return "cubemap array";
		case cBASISTexTypeVideoFrames: return "video";
		case cBASISTexTypeVolume: return "3D";
		default:
			assert(0);
			BASISU_DEVEL_ERROR("basis_get_texture_type_name: Invalid tex_type\n");
			break;
		}
		return "";
	}

	bool basis_transcoder_format_has_alpha(transcoder_texture_format fmt)
	{
		switch (fmt)
		{
		case cTFETC2:
		case cTFBC3:
		case cTFASTC_4x4:
		case cTFBC7_M5:
		case cTFPVRTC1_4_RGBA:
		case cTFATC_RGBA_INTERPOLATED_ALPHA:
		case cTFRGBA32:
		case cTFRGBA4444:
			return true;
		default:
			break;
		}
		return false;
	}

	basisu::texture_format basis_get_basisu_texture_format(transcoder_texture_format fmt)
	{
		switch (fmt)
		{
		case cTFETC1: return basisu::cETC1;
		case cTFBC1: return basisu::cBC1;
		case cTFBC4: return basisu::cBC4;
		case cTFPVRTC1_4_RGB: return basisu::cPVRTC1_4_RGB;
		case cTFPVRTC1_4_RGBA: return basisu::cPVRTC1_4_RGBA;
		case cTFBC7_M6_OPAQUE_ONLY: return basisu::cBC7;
		case cTFBC7_M5: return basisu::cBC7;
		case cTFETC2: return basisu::cETC2_RGBA;
		case cTFBC3: return basisu::cBC3;
		case cTFBC5: return basisu::cBC5;
		case cTFASTC_4x4: return basisu::cASTC4x4;
		case cTFATC_RGB: return basisu::cATC_RGB;
		case cTFATC_RGBA_INTERPOLATED_ALPHA: return basisu::cATC_RGBA_INTERPOLATED_ALPHA;
		case cTFRGBA32: return basisu::cRGBA32;
		case cTFRGB565: return basisu::cRGB565;
		case cTFBGR565: return basisu::cBGR565;
		case cTFRGBA4444: return basisu::cRGBA4444;
		default:
			assert(0);
			BASISU_DEVEL_ERROR("basis_get_basisu_texture_format: Invalid fmt\n");
			break;
		}
		return basisu::cInvalidTextureFormat;
	}

	bool basis_transcoder_format_is_uncompressed(transcoder_texture_format tex_type)
	{
		switch (tex_type)
		{
		case cTFRGBA32:
		case cTFRGB565:
		case cTFBGR565:
		case cTFRGBA4444:
			return true;
		default:
			break;
		}
		return false;
	}

	bool basis_block_format_is_uncompressed(block_format tex_type)
	{
		switch (tex_type)
		{
		case cRGB32:
		case cRGBA32:
		case cA32:
		case cRGB565:
		case cBGR565:
		case cRGBA4444_COLOR:
		case cRGBA4444_ALPHA:
		case cRGBA4444_COLOR_OPAQUE:
			return true;
		default:
			break;
		}
		return false;
	}
	
	uint32_t basis_get_uncompressed_bytes_per_pixel(transcoder_texture_format fmt)
	{
		switch (fmt)
		{
		case cTFRGBA32: 
			return sizeof(uint32_t); 
		case cTFRGB565:
		case cTFBGR565:
		case cTFRGBA4444:
			return sizeof(uint16_t);
		default:
			break;
		}
		return 0;
	}

} // namespace basist