// basisu_gpu_texture.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_gpu_texture.h" #include "basisu_enc.h" #include "basisu_pvrtc1_4.h" #include "basisu_astc_decomp.h" namespace basisu { const int8_t g_etc2_eac_tables[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 }, { -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]; inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const { assert((x < 4) && (y < 4)); return static_cast<uint32_t>((selector_bits >> (45 - (y + x * 4) * 3)) & 7); } inline 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 unpack_etc2_eac(const void *pBlock_bits, color_rgba *pPixels) { static_assert(sizeof(eac_a8_block) == 8, "sizeof(eac_a8_block) == 8"); const eac_a8_block *pBlock = static_cast<const eac_a8_block *>(pBlock_bits); const int8_t *pTable = g_etc2_eac_tables[pBlock->m_table]; const uint64_t selector_bits = pBlock->get_selector_bits(); const int32_t base = pBlock->m_base; const int32_t mul = pBlock->m_multiplier; pPixels[0].a = clamp255(base + pTable[pBlock->get_selector(0, 0, selector_bits)] * mul); pPixels[1].a = clamp255(base + pTable[pBlock->get_selector(1, 0, selector_bits)] * mul); pPixels[2].a = clamp255(base + pTable[pBlock->get_selector(2, 0, selector_bits)] * mul); pPixels[3].a = clamp255(base + pTable[pBlock->get_selector(3, 0, selector_bits)] * mul); pPixels[4].a = clamp255(base + pTable[pBlock->get_selector(0, 1, selector_bits)] * mul); pPixels[5].a = clamp255(base + pTable[pBlock->get_selector(1, 1, selector_bits)] * mul); pPixels[6].a = clamp255(base + pTable[pBlock->get_selector(2, 1, selector_bits)] * mul); pPixels[7].a = clamp255(base + pTable[pBlock->get_selector(3, 1, selector_bits)] * mul); pPixels[8].a = clamp255(base + pTable[pBlock->get_selector(0, 2, selector_bits)] * mul); pPixels[9].a = clamp255(base + pTable[pBlock->get_selector(1, 2, selector_bits)] * mul); pPixels[10].a = clamp255(base + pTable[pBlock->get_selector(2, 2, selector_bits)] * mul); pPixels[11].a = clamp255(base + pTable[pBlock->get_selector(3, 2, selector_bits)] * mul); pPixels[12].a = clamp255(base + pTable[pBlock->get_selector(0, 3, selector_bits)] * mul); pPixels[13].a = clamp255(base + pTable[pBlock->get_selector(1, 3, selector_bits)] * mul); pPixels[14].a = clamp255(base + pTable[pBlock->get_selector(2, 3, selector_bits)] * mul); pPixels[15].a = clamp255(base + pTable[pBlock->get_selector(3, 3, selector_bits)] * mul); } struct bc1_block { enum { cTotalEndpointBytes = 2, cTotalSelectorBytes = 4 }; uint8_t m_low_color[cTotalEndpointBytes]; uint8_t m_high_color[cTotalEndpointBytes]; uint8_t m_selectors[cTotalSelectorBytes]; 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); } static void unpack_color(uint32_t c, uint32_t &r, uint32_t &g, uint32_t &b) { r = (c >> 11) & 31; g = (c >> 5) & 63; b = c & 31; r = (r << 3) | (r >> 2); g = (g << 2) | (g >> 4); b = (b << 3) | (b >> 2); } inline uint32_t get_selector(uint32_t x, uint32_t y) const { assert((x < 4U) && (y < 4U)); return (m_selectors[y] >> (x * 2)) & 3; } }; // Returns true if the block uses 3 color punchthrough alpha mode. bool unpack_bc1(const void *pBlock_bits, color_rgba *pPixels, bool set_alpha) { static_assert(sizeof(bc1_block) == 8, "sizeof(bc1_block) == 8"); const bc1_block *pBlock = static_cast<const bc1_block *>(pBlock_bits); const uint32_t l = pBlock->get_low_color(); const uint32_t h = pBlock->get_high_color(); color_rgba c[4]; uint32_t r0, g0, b0, r1, g1, b1; bc1_block::unpack_color(l, r0, g0, b0); bc1_block::unpack_color(h, r1, g1, b1); bool used_punchthrough = false; if (l > h) { c[0].set_noclamp_rgba(r0, g0, b0, 255); c[1].set_noclamp_rgba(r1, g1, b1, 255); c[2].set_noclamp_rgba((r0 * 2 + r1) / 3, (g0 * 2 + g1) / 3, (b0 * 2 + b1) / 3, 255); c[3].set_noclamp_rgba((r1 * 2 + r0) / 3, (g1 * 2 + g0) / 3, (b1 * 2 + b0) / 3, 255); } else { c[0].set_noclamp_rgba(r0, g0, b0, 255); c[1].set_noclamp_rgba(r1, g1, b1, 255); c[2].set_noclamp_rgba((r0 + r1) / 2, (g0 + g1) / 2, (b0 + b1) / 2, 255); c[3].set_noclamp_rgba(0, 0, 0, 0); used_punchthrough = true; } if (set_alpha) { for (uint32_t y = 0; y < 4; y++, pPixels += 4) { pPixels[0] = c[pBlock->get_selector(0, y)]; pPixels[1] = c[pBlock->get_selector(1, y)]; pPixels[2] = c[pBlock->get_selector(2, y)]; pPixels[3] = c[pBlock->get_selector(3, y)]; } } else { for (uint32_t y = 0; y < 4; y++, pPixels += 4) { pPixels[0].set_rgb(c[pBlock->get_selector(0, y)]); pPixels[1].set_rgb(c[pBlock->get_selector(1, y)]); pPixels[2].set_rgb(c[pBlock->get_selector(2, y)]); pPixels[3].set_rgb(c[pBlock->get_selector(3, y)]); } } return used_punchthrough; } struct bc4_block { enum { cBC4SelectorBits = 3, cTotalSelectorBytes = 6, cMaxSelectorValues = 8 }; uint8_t m_endpoints[2]; uint8_t m_selectors[cTotalSelectorBytes]; inline uint32_t get_low_alpha() const { return m_endpoints[0]; } inline uint32_t get_high_alpha() const { return m_endpoints[1]; } inline bool is_alpha6_block() const { return get_low_alpha() <= get_high_alpha(); } inline uint64_t get_selector_bits() const { return ((uint64_t)((uint32_t)m_selectors[0] | ((uint32_t)m_selectors[1] << 8U) | ((uint32_t)m_selectors[2] << 16U) | ((uint32_t)m_selectors[3] << 24U))) | (((uint64_t)m_selectors[4]) << 32U) | (((uint64_t)m_selectors[5]) << 40U); } inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const { assert((x < 4U) && (y < 4U)); return (selector_bits >> (((y * 4) + x) * cBC4SelectorBits)) & (cMaxSelectorValues - 1); } static inline uint32_t get_block_values6(uint8_t *pDst, uint32_t l, uint32_t h) { pDst[0] = static_cast<uint8_t>(l); pDst[1] = static_cast<uint8_t>(h); pDst[2] = static_cast<uint8_t>((l * 4 + h) / 5); pDst[3] = static_cast<uint8_t>((l * 3 + h * 2) / 5); pDst[4] = static_cast<uint8_t>((l * 2 + h * 3) / 5); pDst[5] = static_cast<uint8_t>((l + h * 4) / 5); pDst[6] = 0; pDst[7] = 255; return 6; } static inline uint32_t get_block_values8(uint8_t *pDst, uint32_t l, uint32_t h) { pDst[0] = static_cast<uint8_t>(l); pDst[1] = static_cast<uint8_t>(h); pDst[2] = static_cast<uint8_t>((l * 6 + h) / 7); pDst[3] = static_cast<uint8_t>((l * 5 + h * 2) / 7); pDst[4] = static_cast<uint8_t>((l * 4 + h * 3) / 7); pDst[5] = static_cast<uint8_t>((l * 3 + h * 4) / 7); pDst[6] = static_cast<uint8_t>((l * 2 + h * 5) / 7); pDst[7] = static_cast<uint8_t>((l + h * 6) / 7); return 8; } static inline uint32_t get_block_values(uint8_t *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); } }; void unpack_bc4(const void *pBlock_bits, uint8_t *pPixels, uint32_t stride) { static_assert(sizeof(bc4_block) == 8, "sizeof(bc4_block) == 8"); const bc4_block *pBlock = static_cast<const bc4_block *>(pBlock_bits); uint8_t sel_values[8]; bc4_block::get_block_values(sel_values, pBlock->get_low_alpha(), pBlock->get_high_alpha()); const uint64_t selector_bits = pBlock->get_selector_bits(); for (uint32_t y = 0; y < 4; y++, pPixels += (stride * 4U)) { pPixels[0] = sel_values[pBlock->get_selector(0, y, selector_bits)]; pPixels[stride * 1] = sel_values[pBlock->get_selector(1, y, selector_bits)]; pPixels[stride * 2] = sel_values[pBlock->get_selector(2, y, selector_bits)]; pPixels[stride * 3] = sel_values[pBlock->get_selector(3, y, selector_bits)]; } } // Returns false if the block uses 3-color punchthrough alpha mode, which isn't supported on some GPU's for BC3. bool unpack_bc3(const void *pBlock_bits, color_rgba *pPixels) { bool success = true; if (unpack_bc1((const uint8_t *)pBlock_bits + sizeof(bc4_block), pPixels, true)) success = false; unpack_bc4(pBlock_bits, &pPixels[0].a, sizeof(color_rgba)); return success; } // writes RG void unpack_bc5(const void *pBlock_bits, color_rgba *pPixels) { unpack_bc4(pBlock_bits, &pPixels[0].r, sizeof(color_rgba)); unpack_bc4((const uint8_t *)pBlock_bits + sizeof(bc4_block), &pPixels[0].g, sizeof(color_rgba)); } // ATC isn't officially documented, so I'm assuming these references: // http://www.guildsoftware.com/papers/2012.Converting.DXTC.to.ATC.pdf // https://github.com/Triang3l/S3TConv/blob/master/s3tconv_atitc.c // The paper incorrectly says the ATC lerp factors are 1/3 and 2/3, but they are actually 3/8 and 5/8. void unpack_atc(const void* pBlock_bits, color_rgba* pPixels) { const uint8_t* pBytes = static_cast<const uint8_t*>(pBlock_bits); const uint16_t color0 = pBytes[0] | (pBytes[1] << 8U); const uint16_t color1 = pBytes[2] | (pBytes[3] << 8U); uint32_t sels = pBytes[4] | (pBytes[5] << 8U) | (pBytes[6] << 16U) | (pBytes[7] << 24U); const bool mode = (color0 & 0x8000) != 0; color_rgba c[4]; c[0].set((color0 >> 10) & 31, (color0 >> 5) & 31, color0 & 31, 255); c[0].r = (c[0].r << 3) | (c[0].r >> 2); c[0].g = (c[0].g << 3) | (c[0].g >> 2); c[0].b = (c[0].b << 3) | (c[0].b >> 2); c[3].set((color1 >> 11) & 31, (color1 >> 5) & 63, color1 & 31, 255); c[3].r = (c[3].r << 3) | (c[3].r >> 2); c[3].g = (c[3].g << 2) | (c[3].g >> 4); c[3].b = (c[3].b << 3) | (c[3].b >> 2); if (mode) { c[1].set(std::max(0, c[0].r - (c[3].r >> 2)), std::max(0, c[0].g - (c[3].g >> 2)), std::max(0, c[0].b - (c[3].b >> 2)), 255); c[2] = c[0]; c[0].set(0, 0, 0, 255); } else { c[1].r = (c[0].r * 5 + c[3].r * 3) >> 3; c[1].g = (c[0].g * 5 + c[3].g * 3) >> 3; c[1].b = (c[0].b * 5 + c[3].b * 3) >> 3; c[2].r = (c[0].r * 3 + c[3].r * 5) >> 3; c[2].g = (c[0].g * 3 + c[3].g * 5) >> 3; c[2].b = (c[0].b * 3 + c[3].b * 5) >> 3; } for (uint32_t i = 0; i < 16; i++) { const uint32_t s = sels & 3; pPixels[i] = c[s]; sels >>= 2; } } 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 const uint32_t g_bc7_weights4[16] = { 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 }; // The transcoder only outputs mode 6 at the moment, so this is easy. bool unpack_bc7_mode6(const void *pBlock_bits, color_rgba *pPixels) { static_assert(sizeof(bc7_mode_6) == 16, "sizeof(bc7_mode_6) == 16"); const bc7_mode_6 &block = *static_cast<const bc7_mode_6 *>(pBlock_bits); if (block.m_lo.m_mode != (1 << 6)) return false; const uint32_t r0 = (uint32_t)((block.m_lo.m_r0 << 1) | block.m_lo.m_p0); const uint32_t g0 = (uint32_t)((block.m_lo.m_g0 << 1) | block.m_lo.m_p0); const uint32_t b0 = (uint32_t)((block.m_lo.m_b0 << 1) | block.m_lo.m_p0); const uint32_t a0 = (uint32_t)((block.m_lo.m_a0 << 1) | block.m_lo.m_p0); const uint32_t r1 = (uint32_t)((block.m_lo.m_r1 << 1) | block.m_hi.m_p1); const uint32_t g1 = (uint32_t)((block.m_lo.m_g1 << 1) | block.m_hi.m_p1); const uint32_t b1 = (uint32_t)((block.m_lo.m_b1 << 1) | block.m_hi.m_p1); const uint32_t a1 = (uint32_t)((block.m_lo.m_a1 << 1) | block.m_hi.m_p1); color_rgba vals[16]; for (uint32_t i = 0; i < 16; i++) { const uint32_t w = g_bc7_weights4[i]; const uint32_t iw = 64 - w; vals[i].set_noclamp_rgba( (r0 * iw + r1 * w + 32) >> 6, (g0 * iw + g1 * w + 32) >> 6, (b0 * iw + b1 * w + 32) >> 6, (a0 * iw + a1 * w + 32) >> 6); } pPixels[0] = vals[block.m_hi.m_s00]; pPixels[1] = vals[block.m_hi.m_s10]; pPixels[2] = vals[block.m_hi.m_s20]; pPixels[3] = vals[block.m_hi.m_s30]; pPixels[4] = vals[block.m_hi.m_s01]; pPixels[5] = vals[block.m_hi.m_s11]; pPixels[6] = vals[block.m_hi.m_s21]; pPixels[7] = vals[block.m_hi.m_s31]; pPixels[8] = vals[block.m_hi.m_s02]; pPixels[9] = vals[block.m_hi.m_s12]; pPixels[10] = vals[block.m_hi.m_s22]; pPixels[11] = vals[block.m_hi.m_s32]; pPixels[12] = vals[block.m_hi.m_s03]; pPixels[13] = vals[block.m_hi.m_s13]; pPixels[14] = vals[block.m_hi.m_s23]; pPixels[15] = vals[block.m_hi.m_s33]; return true; } static inline uint32_t get_block_bits(const uint8_t* pBytes, uint32_t bit_ofs, uint32_t bits_wanted) { assert(bits_wanted < 32); uint32_t v = 0; uint32_t total_bits = 0; while (total_bits < bits_wanted) { uint32_t k = pBytes[bit_ofs >> 3]; k >>= (bit_ofs & 7); uint32_t num_bits_in_byte = 8 - (bit_ofs & 7); v |= (k << total_bits); total_bits += num_bits_in_byte; bit_ofs += num_bits_in_byte; } return v & ((1 << bits_wanted) - 1); } 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; }; color_rgba get_low_color() const { return color_rgba(cNoClamp, (int)((m_lo.m_r0 << 1) | (m_lo.m_r0 >> 6)), (int)((m_lo.m_g0 << 1) | (m_lo.m_g0 >> 6)), (int)((m_lo.m_b0 << 1) | (m_lo.m_b0 >> 6)), m_lo.m_a0); } color_rgba get_high_color() const { return color_rgba(cNoClamp, (int)((m_lo.m_r1 << 1) | (m_lo.m_r1 >> 6)), (int)((m_lo.m_g1 << 1) | (m_lo.m_g1 >> 6)), (int)((m_lo.m_b1 << 1) | (m_lo.m_b1 >> 6)), (int)m_lo.m_a1_0 | ((int)m_hi.m_a1_1 << 6)); } void get_block_colors(color_rgba* pColors) const { const color_rgba low_color(get_low_color()); const color_rgba high_color(get_high_color()); for (uint32_t i = 0; i < 4; i++) { static const uint32_t s_bc7_weights2[4] = { 0, 21, 43, 64 }; pColors[i].set_noclamp_rgba( (low_color.r * (64 - s_bc7_weights2[i]) + high_color.r * s_bc7_weights2[i] + 32) >> 6, (low_color.g * (64 - s_bc7_weights2[i]) + high_color.g * s_bc7_weights2[i] + 32) >> 6, (low_color.b * (64 - s_bc7_weights2[i]) + high_color.b * s_bc7_weights2[i] + 32) >> 6, (low_color.a * (64 - s_bc7_weights2[i]) + high_color.a * s_bc7_weights2[i] + 32) >> 6); } } uint32_t get_selector(uint32_t idx, bool alpha) const { const uint32_t size = (idx == 0) ? 1 : 2; uint32_t ofs = alpha ? 97 : 66; if (idx) ofs += 1 + 2 * (idx - 1); return get_block_bits(reinterpret_cast<const uint8_t*>(this), ofs, size); } }; bool unpack_bc7_mode5(const void* pBlock_bits, color_rgba* pPixels) { static_assert(sizeof(bc7_mode_5) == 16, "sizeof(bc7_mode_5) == 16"); const bc7_mode_5& block = *static_cast<const bc7_mode_5*>(pBlock_bits); if (block.m_lo.m_mode != (1 << 5)) return false; color_rgba block_colors[4]; block.get_block_colors(block_colors); const uint32_t rot = block.m_lo.m_rot; for (uint32_t i = 0; i < 16; i++) { const uint32_t cs = block.get_selector(i, false); color_rgba c(block_colors[cs]); const uint32_t as = block.get_selector(i, true); c.a = block_colors[as].a; if (rot > 0) std::swap(c[3], c[rot - 1]); pPixels[i] = c; } return true; } struct fxt1_block { union { struct { uint64_t m_t00 : 2; uint64_t m_t01 : 2; uint64_t m_t02 : 2; uint64_t m_t03 : 2; uint64_t m_t04 : 2; uint64_t m_t05 : 2; uint64_t m_t06 : 2; uint64_t m_t07 : 2; uint64_t m_t08 : 2; uint64_t m_t09 : 2; uint64_t m_t10 : 2; uint64_t m_t11 : 2; uint64_t m_t12 : 2; uint64_t m_t13 : 2; uint64_t m_t14 : 2; uint64_t m_t15 : 2; uint64_t m_t16 : 2; uint64_t m_t17 : 2; uint64_t m_t18 : 2; uint64_t m_t19 : 2; uint64_t m_t20 : 2; uint64_t m_t21 : 2; uint64_t m_t22 : 2; uint64_t m_t23 : 2; uint64_t m_t24 : 2; uint64_t m_t25 : 2; uint64_t m_t26 : 2; uint64_t m_t27 : 2; uint64_t m_t28 : 2; uint64_t m_t29 : 2; uint64_t m_t30 : 2; uint64_t m_t31 : 2; } m_lo; uint64_t m_lo_bits; uint8_t m_sels[8]; }; union { struct { #ifdef BASISU_USE_ORIGINAL_3DFX_FXT1_ENCODING // This is the format that 3DFX's DECOMP.EXE tool expects, which I'm assuming is what the actual 3DFX hardware wanted. // Unfortunately, color0/color1 and color2/color3 are flipped relative to the official OpenGL extension and Intel's documentation! uint64_t m_b1 : 5; uint64_t m_g1 : 5; uint64_t m_r1 : 5; uint64_t m_b0 : 5; uint64_t m_g0 : 5; uint64_t m_r0 : 5; uint64_t m_b3 : 5; uint64_t m_g3 : 5; uint64_t m_r3 : 5; uint64_t m_b2 : 5; uint64_t m_g2 : 5; uint64_t m_r2 : 5; #else // Intel's encoding, and the encoding in the OpenGL FXT1 spec. uint64_t m_b0 : 5; uint64_t m_g0 : 5; uint64_t m_r0 : 5; uint64_t m_b1 : 5; uint64_t m_g1 : 5; uint64_t m_r1 : 5; uint64_t m_b2 : 5; uint64_t m_g2 : 5; uint64_t m_r2 : 5; uint64_t m_b3 : 5; uint64_t m_g3 : 5; uint64_t m_r3 : 5; #endif uint64_t m_alpha : 1; uint64_t m_glsb : 2; uint64_t m_mode : 1; } m_hi; uint64_t m_hi_bits; }; }; static color_rgba expand_565(const color_rgba& c) { return color_rgba((c.r << 3) | (c.r >> 2), (c.g << 2) | (c.g >> 4), (c.b << 3) | (c.b >> 2), 255); } // We only support CC_MIXED non-alpha blocks here because that's the only mode the transcoder uses at the moment. bool unpack_fxt1(const void *p, color_rgba *pPixels) { const fxt1_block* pBlock = static_cast<const fxt1_block*>(p); if (pBlock->m_hi.m_mode == 0) return false; if (pBlock->m_hi.m_alpha == 1) return false; color_rgba colors[4]; colors[0].r = pBlock->m_hi.m_r0; colors[0].g = (uint8_t)((pBlock->m_hi.m_g0 << 1) | ((pBlock->m_lo.m_t00 >> 1) ^ (pBlock->m_hi.m_glsb & 1))); colors[0].b = pBlock->m_hi.m_b0; colors[0].a = 255; colors[1].r = pBlock->m_hi.m_r1; colors[1].g = (uint8_t)((pBlock->m_hi.m_g1 << 1) | (pBlock->m_hi.m_glsb & 1)); colors[1].b = pBlock->m_hi.m_b1; colors[1].a = 255; colors[2].r = pBlock->m_hi.m_r2; colors[2].g = (uint8_t)((pBlock->m_hi.m_g2 << 1) | ((pBlock->m_lo.m_t16 >> 1) ^ (pBlock->m_hi.m_glsb >> 1))); colors[2].b = pBlock->m_hi.m_b2; colors[2].a = 255; colors[3].r = pBlock->m_hi.m_r3; colors[3].g = (uint8_t)((pBlock->m_hi.m_g3 << 1) | (pBlock->m_hi.m_glsb >> 1)); colors[3].b = pBlock->m_hi.m_b3; colors[3].a = 255; for (uint32_t i = 0; i < 4; i++) colors[i] = expand_565(colors[i]); color_rgba block0_colors[4]; block0_colors[0] = colors[0]; block0_colors[1] = color_rgba((colors[0].r * 2 + colors[1].r + 1) / 3, (colors[0].g * 2 + colors[1].g + 1) / 3, (colors[0].b * 2 + colors[1].b + 1) / 3, 255); block0_colors[2] = color_rgba((colors[1].r * 2 + colors[0].r + 1) / 3, (colors[1].g * 2 + colors[0].g + 1) / 3, (colors[1].b * 2 + colors[0].b + 1) / 3, 255); block0_colors[3] = colors[1]; for (uint32_t i = 0; i < 16; i++) { const uint32_t sel = (pBlock->m_sels[i >> 2] >> ((i & 3) * 2)) & 3; const uint32_t x = i & 3; const uint32_t y = i >> 2; pPixels[x + y * 8] = block0_colors[sel]; } color_rgba block1_colors[4]; block1_colors[0] = colors[2]; block1_colors[1] = color_rgba((colors[2].r * 2 + colors[3].r + 1) / 3, (colors[2].g * 2 + colors[3].g + 1) / 3, (colors[2].b * 2 + colors[3].b + 1) / 3, 255); block1_colors[2] = color_rgba((colors[3].r * 2 + colors[2].r + 1) / 3, (colors[3].g * 2 + colors[2].g + 1) / 3, (colors[3].b * 2 + colors[2].b + 1) / 3, 255); block1_colors[3] = colors[3]; for (uint32_t i = 0; i < 16; i++) { const uint32_t sel = (pBlock->m_sels[4 + (i >> 2)] >> ((i & 3) * 2)) & 3; const uint32_t x = i & 3; const uint32_t y = i >> 2; pPixels[4 + x + y * 8] = block1_colors[sel]; } return true; } struct pvrtc2_block { uint8_t m_modulation[4]; union { union { // Opaque mode: RGB colora=554 and colorb=555 struct { uint32_t m_mod_flag : 1; uint32_t m_blue_a : 4; uint32_t m_green_a : 5; uint32_t m_red_a : 5; uint32_t m_hard_flag : 1; uint32_t m_blue_b : 5; uint32_t m_green_b : 5; uint32_t m_red_b : 5; uint32_t m_opaque_flag : 1; } m_opaque_color_data; // Transparent mode: RGBA colora=4433 and colorb=4443 struct { uint32_t m_mod_flag : 1; uint32_t m_blue_a : 3; uint32_t m_green_a : 4; uint32_t m_red_a : 4; uint32_t m_alpha_a : 3; uint32_t m_hard_flag : 1; uint32_t m_blue_b : 4; uint32_t m_green_b : 4; uint32_t m_red_b : 4; uint32_t m_alpha_b : 3; uint32_t m_opaque_flag : 1; } m_trans_color_data; }; uint32_t m_color_data_bits; }; }; static color_rgba convert_rgb_555_to_888(const color_rgba& col) { return color_rgba((col[0] << 3) | (col[0] >> 2), (col[1] << 3) | (col[1] >> 2), (col[2] << 3) | (col[2] >> 2), 255); } static color_rgba convert_rgba_5554_to_8888(const color_rgba& col) { return color_rgba((col[0] << 3) | (col[0] >> 2), (col[1] << 3) | (col[1] >> 2), (col[2] << 3) | (col[2] >> 2), (col[3] << 4) | col[3]); } // PVRTC2 is currently limited to only what our transcoder outputs (non-interpolated, hard_flag=1 modulation=0). In this mode, PVRTC2 looks much like BC1/ATC. bool unpack_pvrtc2(const void *p, color_rgba *pPixels) { const pvrtc2_block* pBlock = static_cast<const pvrtc2_block*>(p); if ((!pBlock->m_opaque_color_data.m_hard_flag) || (pBlock->m_opaque_color_data.m_mod_flag)) { // This mode isn't supported by the transcoder, so we aren't bothering with it here. return false; } color_rgba colors[4]; if (pBlock->m_opaque_color_data.m_opaque_flag) { // colora=554 color_rgba color_a(pBlock->m_opaque_color_data.m_red_a, pBlock->m_opaque_color_data.m_green_a, (pBlock->m_opaque_color_data.m_blue_a << 1) | (pBlock->m_opaque_color_data.m_blue_a >> 3), 255); // colora=555 color_rgba color_b(pBlock->m_opaque_color_data.m_red_b, pBlock->m_opaque_color_data.m_green_b, pBlock->m_opaque_color_data.m_blue_b, 255); colors[0] = convert_rgb_555_to_888(color_a); colors[3] = convert_rgb_555_to_888(color_b); colors[1].set((colors[0].r * 5 + colors[3].r * 3) / 8, (colors[0].g * 5 + colors[3].g * 3) / 8, (colors[0].b * 5 + colors[3].b * 3) / 8, 255); colors[2].set((colors[0].r * 3 + colors[3].r * 5) / 8, (colors[0].g * 3 + colors[3].g * 5) / 8, (colors[0].b * 3 + colors[3].b * 5) / 8, 255); } else { // colora=4433 color_rgba color_a( (pBlock->m_trans_color_data.m_red_a << 1) | (pBlock->m_trans_color_data.m_red_a >> 3), (pBlock->m_trans_color_data.m_green_a << 1) | (pBlock->m_trans_color_data.m_green_a >> 3), (pBlock->m_trans_color_data.m_blue_a << 2) | (pBlock->m_trans_color_data.m_blue_a >> 1), pBlock->m_trans_color_data.m_alpha_a << 1); //colorb=4443 color_rgba color_b( (pBlock->m_trans_color_data.m_red_b << 1) | (pBlock->m_trans_color_data.m_red_b >> 3), (pBlock->m_trans_color_data.m_green_b << 1) | (pBlock->m_trans_color_data.m_green_b >> 3), (pBlock->m_trans_color_data.m_blue_b << 1) | (pBlock->m_trans_color_data.m_blue_b >> 3), (pBlock->m_trans_color_data.m_alpha_b << 1) | 1); colors[0] = convert_rgba_5554_to_8888(color_a); colors[3] = convert_rgba_5554_to_8888(color_b); } colors[1].set((colors[0].r * 5 + colors[3].r * 3) / 8, (colors[0].g * 5 + colors[3].g * 3) / 8, (colors[0].b * 5 + colors[3].b * 3) / 8, (colors[0].a * 5 + colors[3].a * 3) / 8); colors[2].set((colors[0].r * 3 + colors[3].r * 5) / 8, (colors[0].g * 3 + colors[3].g * 5) / 8, (colors[0].b * 3 + colors[3].b * 5) / 8, (colors[0].a * 3 + colors[3].a * 5) / 8); for (uint32_t i = 0; i < 16; i++) { const uint32_t sel = (pBlock->m_modulation[i >> 2] >> ((i & 3) * 2)) & 3; pPixels[i] = colors[sel]; } return true; } struct etc2_eac_r11 { uint64_t m_base : 8; uint64_t m_table : 4; uint64_t m_mul : 4; uint64_t m_sels_0 : 8; uint64_t m_sels_1 : 8; uint64_t m_sels_2 : 8; uint64_t m_sels_3 : 8; uint64_t m_sels_4 : 8; uint64_t m_sels_5 : 8; uint64_t get_sels() const { return ((uint64_t)m_sels_0 << 40U) | ((uint64_t)m_sels_1 << 32U) | ((uint64_t)m_sels_2 << 24U) | ((uint64_t)m_sels_3 << 16U) | ((uint64_t)m_sels_4 << 8U) | m_sels_5; } void set_sels(uint64_t v) { m_sels_0 = (v >> 40U) & 0xFF; m_sels_1 = (v >> 32U) & 0xFF; m_sels_2 = (v >> 24U) & 0xFF; m_sels_3 = (v >> 16U) & 0xFF; m_sels_4 = (v >> 8U) & 0xFF; m_sels_5 = v & 0xFF; } }; struct etc2_eac_rg11 { etc2_eac_r11 m_c[2]; }; static void unpack_etc2_eac_r(const etc2_eac_r11* p, color_rgba* pPixels, uint32_t c) { const uint64_t sels = p->get_sels(); const int base = (int)p->m_base * 8 + 4; const int mul = p->m_mul ? ((int)p->m_mul * 8) : 1; const int table = (int)p->m_table; for (uint32_t y = 0; y < 4; y++) { for (uint32_t x = 0; x < 4; x++) { const uint32_t shift = 45 - ((y + x * 4) * 3); const uint32_t sel = (uint32_t)((sels >> shift) & 7); int val = base + g_etc2_eac_tables[table][sel] * mul; val = clamp<int>(val, 0, 2047); // Convert to 8-bits with rounding pPixels[x + y * 4].m_comps[c] = static_cast<uint8_t>((val * 255 + 1024) / 2047); } // x } // y } void unpack_etc2_eac_rg(const void* p, color_rgba* pPixels) { for (uint32_t c = 0; c < 2; c++) { const etc2_eac_r11* pBlock = &static_cast<const etc2_eac_rg11*>(p)->m_c[c]; unpack_etc2_eac_r(pBlock, pPixels, c); } } // Unpacks to RGBA, R, RG, or A bool unpack_block(texture_format fmt, const void* pBlock, color_rgba* pPixels) { switch (fmt) { case texture_format::cBC1: { unpack_bc1(pBlock, pPixels, true); break; } case texture_format::cBC3: { return unpack_bc3(pBlock, pPixels); } case texture_format::cBC4: { // Unpack to R unpack_bc4(pBlock, &pPixels[0].r, sizeof(color_rgba)); break; } case texture_format::cBC5: { unpack_bc5(pBlock, pPixels); break; } case texture_format::cBC7: { // We only support modes 5 and 6. if (!unpack_bc7_mode5(pBlock, pPixels)) { if (!unpack_bc7_mode6(pBlock, pPixels)) return false; } break; } // Full ETC2 color blocks (planar/T/H modes) is currently unsupported in basisu, but we do support ETC2 with alpha (using ETC1 for color) case texture_format::cETC2_RGB: case texture_format::cETC1: case texture_format::cETC1S: { return unpack_etc1(*static_cast<const etc_block*>(pBlock), pPixels); } case texture_format::cETC2_RGBA: { if (!unpack_etc1(static_cast<const etc_block*>(pBlock)[1], pPixels)) return false; unpack_etc2_eac(pBlock, pPixels); break; } case texture_format::cETC2_ALPHA: { // Unpack to A unpack_etc2_eac(pBlock, pPixels); break; } case texture_format::cASTC4x4: { const bool astc_srgb = false; basisu_astc::astc::decompress(reinterpret_cast<uint8_t*>(pPixels), static_cast<const uint8_t*>(pBlock), astc_srgb, 4, 4); break; } case texture_format::cATC_RGB: { unpack_atc(pBlock, pPixels); break; } case texture_format::cATC_RGBA_INTERPOLATED_ALPHA: { unpack_atc(static_cast<const uint8_t*>(pBlock) + 8, pPixels); unpack_bc4(pBlock, &pPixels[0].a, sizeof(color_rgba)); break; } case texture_format::cFXT1_RGB: { unpack_fxt1(pBlock, pPixels); break; } case texture_format::cPVRTC2_4_RGBA: { unpack_pvrtc2(pBlock, pPixels); break; } case texture_format::cETC2_R11_EAC: { unpack_etc2_eac_r(static_cast<const etc2_eac_r11 *>(pBlock), pPixels, 0); break; } case texture_format::cETC2_RG11_EAC: { unpack_etc2_eac_rg(pBlock, pPixels); break; } default: { assert(0); // TODO return false; } } return true; } bool gpu_image::unpack(image& img) const { img.resize(get_pixel_width(), get_pixel_height()); img.set_all(g_black_color); if (!img.get_width() || !img.get_height()) return true; if ((m_fmt == texture_format::cPVRTC1_4_RGB) || (m_fmt == texture_format::cPVRTC1_4_RGBA)) { pvrtc4_image pi(m_width, m_height); if (get_total_blocks() != pi.get_total_blocks()) return false; memcpy(&pi.get_blocks()[0], get_ptr(), get_size_in_bytes()); pi.deswizzle(); pi.unpack_all_pixels(img); return true; } assert((m_block_width <= cMaxBlockSize) && (m_block_height <= cMaxBlockSize)); color_rgba pixels[cMaxBlockSize * cMaxBlockSize]; for (uint32_t i = 0; i < cMaxBlockSize * cMaxBlockSize; i++) pixels[i] = g_black_color; bool success = true; for (uint32_t by = 0; by < m_blocks_y; by++) { for (uint32_t bx = 0; bx < m_blocks_x; bx++) { const void* pBlock = get_block_ptr(bx, by); if (!unpack_block(m_fmt, pBlock, pixels)) success = false; img.set_block_clipped(pixels, bx * m_block_width, by * m_block_height, m_block_width, m_block_height); } // bx } // by return success; } static const uint8_t g_ktx_file_id[12] = { 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A }; // KTX/GL enums enum { KTX_ENDIAN = 0x04030201, KTX_OPPOSITE_ENDIAN = 0x01020304, KTX_ETC1_RGB8_OES = 0x8D64, KTX_RED = 0x1903, KTX_RG = 0x8227, KTX_RGB = 0x1907, KTX_RGBA = 0x1908, KTX_COMPRESSED_RGB_S3TC_DXT1_EXT = 0x83F0, KTX_COMPRESSED_RGBA_S3TC_DXT5_EXT = 0x83F3, KTX_COMPRESSED_RED_RGTC1_EXT = 0x8DBB, KTX_COMPRESSED_RED_GREEN_RGTC2_EXT = 0x8DBD, KTX_COMPRESSED_RGB8_ETC2 = 0x9274, KTX_COMPRESSED_RGBA8_ETC2_EAC = 0x9278, KTX_COMPRESSED_RGBA_BPTC_UNORM = 0x8E8C, KTX_COMPRESSED_SRGB_ALPHA_BPTC_UNORM = 0x8E8D, KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG = 0x8C00, KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG = 0x8C02, KTX_COMPRESSED_RGBA_ASTC_4x4_KHR = 0x93B0, KTX_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR = 0x93D0, KTX_ATC_RGB_AMD = 0x8C92, KTX_ATC_RGBA_INTERPOLATED_ALPHA_AMD = 0x87EE, KTX_COMPRESSED_RGB_FXT1_3DFX = 0x86B0, KTX_COMPRESSED_RGBA_FXT1_3DFX = 0x86B1, KTX_COMPRESSED_RGBA_PVRTC_4BPPV2_IMG = 0x9138, KTX_COMPRESSED_R11_EAC = 0x9270, KTX_COMPRESSED_RG11_EAC = 0x9272 }; struct ktx_header { uint8_t m_identifier[12]; packed_uint<4> m_endianness; packed_uint<4> m_glType; packed_uint<4> m_glTypeSize; packed_uint<4> m_glFormat; packed_uint<4> m_glInternalFormat; packed_uint<4> m_glBaseInternalFormat; packed_uint<4> m_pixelWidth; packed_uint<4> m_pixelHeight; packed_uint<4> m_pixelDepth; packed_uint<4> m_numberOfArrayElements; packed_uint<4> m_numberOfFaces; packed_uint<4> m_numberOfMipmapLevels; packed_uint<4> m_bytesOfKeyValueData; void clear() { clear_obj(*this); } }; // Input is a texture array of mipmapped gpu_image's: gpu_images[array_index][level_index] bool create_ktx_texture_file(uint8_vec &ktx_data, const std::vector<gpu_image_vec>& gpu_images, bool cubemap_flag) { if (!gpu_images.size()) { assert(0); return false; } uint32_t width = 0, height = 0, total_levels = 0; basisu::texture_format fmt = texture_format::cInvalidTextureFormat; if (cubemap_flag) { if ((gpu_images.size() % 6) != 0) { assert(0); return false; } } for (uint32_t array_index = 0; array_index < gpu_images.size(); array_index++) { const gpu_image_vec &levels = gpu_images[array_index]; if (!levels.size()) { // Empty mip chain assert(0); return false; } if (!array_index) { width = levels[0].get_pixel_width(); height = levels[0].get_pixel_height(); total_levels = (uint32_t)levels.size(); fmt = levels[0].get_format(); } else { if ((width != levels[0].get_pixel_width()) || (height != levels[0].get_pixel_height()) || (total_levels != levels.size())) { // All cubemap/texture array faces must be the same dimension assert(0); return false; } } for (uint32_t level_index = 0; level_index < levels.size(); level_index++) { if (level_index) { if ( (levels[level_index].get_pixel_width() != maximum<uint32_t>(1, levels[0].get_pixel_width() >> level_index)) || (levels[level_index].get_pixel_height() != maximum<uint32_t>(1, levels[0].get_pixel_height() >> level_index)) ) { // Malformed mipmap chain assert(0); return false; } } if (fmt != levels[level_index].get_format()) { // All input textures must use the same GPU format assert(0); return false; } } } uint32_t internal_fmt = KTX_ETC1_RGB8_OES, base_internal_fmt = KTX_RGB; switch (fmt) { case texture_format::cBC1: { internal_fmt = KTX_COMPRESSED_RGB_S3TC_DXT1_EXT; break; } case texture_format::cBC3: { internal_fmt = KTX_COMPRESSED_RGBA_S3TC_DXT5_EXT; base_internal_fmt = KTX_RGBA; break; } case texture_format::cBC4: { internal_fmt = KTX_COMPRESSED_RED_RGTC1_EXT;// KTX_COMPRESSED_LUMINANCE_LATC1_EXT; base_internal_fmt = KTX_RED; break; } case texture_format::cBC5: { internal_fmt = KTX_COMPRESSED_RED_GREEN_RGTC2_EXT; base_internal_fmt = KTX_RG; break; } case texture_format::cETC1: case texture_format::cETC1S: { internal_fmt = KTX_ETC1_RGB8_OES; break; } case texture_format::cETC2_RGB: { internal_fmt = KTX_COMPRESSED_RGB8_ETC2; break; } case texture_format::cETC2_RGBA: { internal_fmt = KTX_COMPRESSED_RGBA8_ETC2_EAC; base_internal_fmt = KTX_RGBA; break; } case texture_format::cBC7: { internal_fmt = KTX_COMPRESSED_RGBA_BPTC_UNORM; base_internal_fmt = KTX_RGBA; break; } case texture_format::cPVRTC1_4_RGB: { internal_fmt = KTX_COMPRESSED_RGB_PVRTC_4BPPV1_IMG; break; } case texture_format::cPVRTC1_4_RGBA: { internal_fmt = KTX_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG; base_internal_fmt = KTX_RGBA; break; } case texture_format::cASTC4x4: { internal_fmt = KTX_COMPRESSED_RGBA_ASTC_4x4_KHR; base_internal_fmt = KTX_RGBA; break; } case texture_format::cATC_RGB: { internal_fmt = KTX_ATC_RGB_AMD; break; } case texture_format::cATC_RGBA_INTERPOLATED_ALPHA: { internal_fmt = KTX_ATC_RGBA_INTERPOLATED_ALPHA_AMD; base_internal_fmt = KTX_RGBA; break; } case texture_format::cETC2_R11_EAC: { internal_fmt = KTX_COMPRESSED_R11_EAC; base_internal_fmt = KTX_RED; break; } case texture_format::cETC2_RG11_EAC: { internal_fmt = KTX_COMPRESSED_RG11_EAC; base_internal_fmt = KTX_RG; break; } case texture_format::cFXT1_RGB: { internal_fmt = KTX_COMPRESSED_RGB_FXT1_3DFX; break; } case texture_format::cPVRTC2_4_RGBA: { internal_fmt = KTX_COMPRESSED_RGBA_PVRTC_4BPPV2_IMG; base_internal_fmt = KTX_RGBA; break; } default: { // TODO assert(0); return false; } } ktx_header header; header.clear(); memcpy(&header.m_identifier, g_ktx_file_id, sizeof(g_ktx_file_id)); header.m_endianness = KTX_ENDIAN; header.m_pixelWidth = width; header.m_pixelHeight = height; header.m_glInternalFormat = internal_fmt; header.m_glBaseInternalFormat = base_internal_fmt; header.m_numberOfArrayElements = (uint32_t)(cubemap_flag ? (gpu_images.size() / 6) : gpu_images.size()); if (header.m_numberOfArrayElements == 1) header.m_numberOfArrayElements = 0; header.m_numberOfMipmapLevels = total_levels; header.m_numberOfFaces = cubemap_flag ? 6 : 1; append_vector(ktx_data, (uint8_t *)&header, sizeof(header)); for (uint32_t level_index = 0; level_index < total_levels; level_index++) { uint32_t img_size = gpu_images[0][level_index].get_size_in_bytes(); if ((header.m_numberOfFaces == 1) || (header.m_numberOfArrayElements > 1)) { img_size = img_size * header.m_numberOfFaces * maximum<uint32_t>(1, header.m_numberOfArrayElements); } assert(img_size && ((img_size & 3) == 0)); packed_uint<4> packed_img_size(img_size); append_vector(ktx_data, (uint8_t *)&packed_img_size, sizeof(packed_img_size)); uint32_t bytes_written = 0; for (uint32_t array_index = 0; array_index < maximum<uint32_t>(1, header.m_numberOfArrayElements); array_index++) { for (uint32_t face_index = 0; face_index < header.m_numberOfFaces; face_index++) { const gpu_image& img = gpu_images[cubemap_flag ? (array_index * 6 + face_index) : array_index][level_index]; append_vector(ktx_data, (uint8_t *)img.get_ptr(), img.get_size_in_bytes()); bytes_written += img.get_size_in_bytes(); } } // array_index } // level_index return true; } bool write_compressed_texture_file(const char* pFilename, const std::vector<gpu_image_vec>& g, bool cubemap_flag) { std::string extension(string_tolower(string_get_extension(pFilename))); uint8_vec filedata; if (extension == "ktx") { if (!create_ktx_texture_file(filedata, g, cubemap_flag)) return false; } else if (extension == "pvr") { // TODO return false; } else if (extension == "dds") { // TODO return false; } else { // unsupported texture format assert(0); return false; } return basisu::write_vec_to_file(pFilename, filedata); } bool write_compressed_texture_file(const char* pFilename, const gpu_image& g) { std::vector<gpu_image_vec> v; enlarge_vector(v, 1)->push_back(g); return write_compressed_texture_file(pFilename, v, false); } const uint32_t OUT_FILE_MAGIC = 'TEXC'; struct out_file_header { packed_uint<4> m_magic; packed_uint<4> m_pad; packed_uint<4> m_width; packed_uint<4> m_height; }; // As no modern tool supports FXT1 format .KTX files, let's write .OUT files and make sure 3DFX's original tools shipped in 1999 can decode our encoded output. bool write_3dfx_out_file(const char* pFilename, const gpu_image& gi) { out_file_header hdr; hdr.m_magic = OUT_FILE_MAGIC; hdr.m_pad = 0; hdr.m_width = gi.get_blocks_x() * 8; hdr.m_height = gi.get_blocks_y() * 4; FILE* pFile = nullptr; #ifdef _WIN32 fopen_s(&pFile, pFilename, "wb"); #else pFile = fopen(pFilename, "wb"); #endif if (!pFile) return false; fwrite(&hdr, sizeof(hdr), 1, pFile); fwrite(gi.get_ptr(), gi.get_size_in_bytes(), 1, pFile); return fclose(pFile) != EOF; } } // basisu