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-rw-r--r--thirdparty/pvrtccompressor/PvrTcEncoder.cpp474
1 files changed, 474 insertions, 0 deletions
diff --git a/thirdparty/pvrtccompressor/PvrTcEncoder.cpp b/thirdparty/pvrtccompressor/PvrTcEncoder.cpp
new file mode 100644
index 0000000000..587b1320f1
--- /dev/null
+++ b/thirdparty/pvrtccompressor/PvrTcEncoder.cpp
@@ -0,0 +1,474 @@
+//============================================================================
+
+#include "PvrTcEncoder.h"
+#include "AlphaBitmap.h"
+#include "PvrTcPacket.h"
+#include "RgbBitmap.h"
+#include "RgbaBitmap.h"
+#include "MortonTable.h"
+#include "BitUtility.h"
+#include "Interval.h"
+#include <assert.h>
+#include <math.h>
+#include <stdint.h>
+
+//============================================================================
+
+using namespace Javelin;
+using Data::MORTON_TABLE;
+
+//============================================================================
+
+static const unsigned char MODULATION_LUT[16] =
+{
+ 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3
+};
+
+//============================================================================
+
+inline unsigned PvrTcEncoder::GetMortonNumber(int x, int y)
+{
+ return MORTON_TABLE[x >> 8] << 17 | MORTON_TABLE[y >> 8] << 16 | MORTON_TABLE[x & 0xFF] << 1 | MORTON_TABLE[y & 0xFF];
+}
+
+//============================================================================
+
+void PvrTcEncoder::EncodeAlpha2Bpp(void* result, const AlphaBitmap& bitmap)
+{
+ int size = bitmap.GetBitmapWidth();
+ assert(size == bitmap.GetBitmapHeight());
+ assert(BitUtility::IsPowerOf2(size));
+
+ // Blocks in each dimension.
+ int xBlocks = size/8;
+ int yBlocks = size/4;
+
+ const unsigned char* bitmapData = bitmap.GetRawData();
+
+ PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
+ for(int y = 0; y < yBlocks; ++y)
+ {
+ for(int x = 0; x < xBlocks; ++x)
+ {
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->usePunchthroughAlpha = 0;
+ packet->colorAIsOpaque = 0;
+ packet->colorA = 0x7ff; // White, with 0 alpha
+ packet->colorBIsOpaque = 1;
+ packet->colorB = 0x7fff; // White with full alpha
+
+ const unsigned char* blockBitmapData = &bitmapData[y*4*size + x*8];
+
+ uint32_t modulationData = 0;
+ for(int py = 0; py < 4; ++py)
+ {
+ const unsigned char* rowBitmapData = blockBitmapData;
+ for(int px = 0; px < 8; ++px)
+ {
+ unsigned char pixel = *rowBitmapData++;
+ modulationData = BitUtility::RotateRight(modulationData | (pixel >> 7), 1);
+ }
+ blockBitmapData += size;
+ }
+ packet->modulationData = modulationData;
+ }
+ }
+}
+
+void PvrTcEncoder::EncodeAlpha4Bpp(void* result, const AlphaBitmap& bitmap)
+{
+ int size = bitmap.GetBitmapWidth();
+ assert(size == bitmap.GetBitmapHeight());
+ assert(BitUtility::IsPowerOf2(size));
+
+ // Blocks in each dimension.
+ int blocks = size/4;
+
+ const unsigned char* bitmapData = bitmap.GetRawData();
+
+ PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->usePunchthroughAlpha = 0;
+ packet->colorAIsOpaque = 0;
+ packet->colorA = 0x7ff; // White, with 0 alpha
+ packet->colorBIsOpaque = 1;
+ packet->colorB = 0x7fff; // White with full alpha
+
+ const unsigned char* blockBitmapData = &bitmapData[(y*size + x)*4];
+
+ uint32_t modulationData = 0;
+ for(int py = 0; py < 4; ++py)
+ {
+ const unsigned char* rowBitmapData = blockBitmapData;
+ for(int px = 0; px < 4; ++px)
+ {
+ unsigned char pixel = *rowBitmapData++;
+ modulationData = BitUtility::RotateRight(modulationData | MODULATION_LUT[pixel>>4], 2);
+ }
+ blockBitmapData += size;
+ }
+ packet->modulationData = modulationData;
+ }
+ }
+}
+
+//============================================================================
+
+typedef Interval<ColorRgb<unsigned char> > ColorRgbBoundingBox;
+
+static void CalculateBoundingBox(ColorRgbBoundingBox& cbb, const RgbBitmap& bitmap, int blockX, int blockY)
+{
+ int size = bitmap.GetBitmapWidth();
+ const ColorRgb<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
+
+ cbb.min = data[0];
+ cbb.max = data[0];
+ cbb |= data[1];
+ cbb |= data[2];
+ cbb |= data[3];
+
+ cbb |= data[size];
+ cbb |= data[size+1];
+ cbb |= data[size+2];
+ cbb |= data[size+3];
+
+ cbb |= data[2*size];
+ cbb |= data[2*size+1];
+ cbb |= data[2*size+2];
+ cbb |= data[2*size+3];
+
+ cbb |= data[3*size];
+ cbb |= data[3*size+1];
+ cbb |= data[3*size+2];
+ cbb |= data[3*size+3];
+}
+
+void PvrTcEncoder::EncodeRgb4Bpp(void* result, const RgbBitmap& bitmap)
+{
+ assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
+ assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
+ const int size = bitmap.GetBitmapWidth();
+ const int blocks = size / 4;
+ const int blockMask = blocks-1;
+
+ PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
+
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ ColorRgbBoundingBox cbb;
+ CalculateBoundingBox(cbb, bitmap, x, y);
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->usePunchthroughAlpha = 0;
+ packet->SetColorA(cbb.min);
+ packet->SetColorB(cbb.max);
+ }
+ }
+
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
+ const ColorRgb<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
+
+ uint32_t modulationData = 0;
+
+ for(int py = 0; py < 4; ++py)
+ {
+ const int yOffset = (py < 2) ? -1 : 0;
+ const int y0 = (y + yOffset) & blockMask;
+ const int y1 = (y0+1) & blockMask;
+
+ for(int px = 0; px < 4; ++px)
+ {
+ const int xOffset = (px < 2) ? -1 : 0;
+ const int x0 = (x + xOffset) & blockMask;
+ const int x1 = (x0+1) & blockMask;
+
+ const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
+ const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
+ const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
+ const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
+
+ ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
+ p1->GetColorRgbA() * (*factor)[1] +
+ p2->GetColorRgbA() * (*factor)[2] +
+ p3->GetColorRgbA() * (*factor)[3];
+
+ ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
+ p1->GetColorRgbB() * (*factor)[1] +
+ p2->GetColorRgbB() * (*factor)[2] +
+ p3->GetColorRgbB() * (*factor)[3];
+
+ const ColorRgb<unsigned char>& pixel = data[py*size + px];
+ ColorRgb<int> d = cb - ca;
+ ColorRgb<int> p;
+ p.r=pixel.r*16;
+ p.g=pixel.g*16;
+ p.b=pixel.b*16;
+ ColorRgb<int> v = p - ca;
+
+ // PVRTC uses weightings of 0, 3/8, 5/8 and 1
+ // The boundaries for these are 3/16, 1/2 (=8/16), 13/16
+ int projection = (v % d) * 16;
+ int lengthSquared = d % d;
+ if(projection > 3*lengthSquared) modulationData++;
+ if(projection > 8*lengthSquared) modulationData++;
+ if(projection > 13*lengthSquared) modulationData++;
+
+ modulationData = BitUtility::RotateRight(modulationData, 2);
+
+ factor++;
+ }
+ }
+
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->modulationData = modulationData;
+ }
+ }
+}
+
+//============================================================================
+
+static void CalculateBoundingBox(ColorRgbBoundingBox& cbb, const RgbaBitmap& bitmap, int blockX, int blockY)
+{
+ int size = bitmap.GetBitmapWidth();
+ const ColorRgba<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
+
+ cbb.min = data[0];
+ cbb.max = data[0];
+
+ cbb |= data[1];
+ cbb |= data[2];
+ cbb |= data[3];
+
+ cbb |= data[size];
+ cbb |= data[size+1];
+ cbb |= data[size+2];
+ cbb |= data[size+3];
+
+ cbb |= data[2*size];
+ cbb |= data[2*size+1];
+ cbb |= data[2*size+2];
+ cbb |= data[2*size+3];
+
+ cbb |= data[3*size];
+ cbb |= data[3*size+1];
+ cbb |= data[3*size+2];
+ cbb |= data[3*size+3];
+}
+
+void PvrTcEncoder::EncodeRgb4Bpp(void* result, const RgbaBitmap& bitmap)
+{
+ assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
+ assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
+ const int size = bitmap.GetBitmapWidth();
+ const int blocks = size / 4;
+ const int blockMask = blocks-1;
+
+ PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
+
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ ColorRgbBoundingBox cbb;
+ CalculateBoundingBox(cbb, bitmap, x, y);
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->usePunchthroughAlpha = 0;
+ packet->SetColorA(cbb.min);
+ packet->SetColorB(cbb.max);
+ }
+ }
+
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
+ const ColorRgba<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
+
+ uint32_t modulationData = 0;
+
+ for(int py = 0; py < 4; ++py)
+ {
+ const int yOffset = (py < 2) ? -1 : 0;
+ const int y0 = (y + yOffset) & blockMask;
+ const int y1 = (y0+1) & blockMask;
+
+ for(int px = 0; px < 4; ++px)
+ {
+ const int xOffset = (px < 2) ? -1 : 0;
+ const int x0 = (x + xOffset) & blockMask;
+ const int x1 = (x0+1) & blockMask;
+
+ const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
+ const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
+ const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
+ const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
+
+ ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
+ p1->GetColorRgbA() * (*factor)[1] +
+ p2->GetColorRgbA() * (*factor)[2] +
+ p3->GetColorRgbA() * (*factor)[3];
+
+ ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
+ p1->GetColorRgbB() * (*factor)[1] +
+ p2->GetColorRgbB() * (*factor)[2] +
+ p3->GetColorRgbB() * (*factor)[3];
+
+ const ColorRgb<unsigned char>& pixel = data[py*size + px];
+ ColorRgb<int> d = cb - ca;
+ ColorRgb<int> p;
+ p.r=pixel.r*16;
+ p.g=pixel.g*16;
+ p.b=pixel.b*16;
+ ColorRgb<int> v = p - ca;
+
+ // PVRTC uses weightings of 0, 3/8, 5/8 and 1
+ // The boundaries for these are 3/16, 1/2 (=8/16), 13/16
+ int projection = (v % d) * 16;
+ int lengthSquared = d % d;
+ if(projection > 3*lengthSquared) modulationData++;
+ if(projection > 8*lengthSquared) modulationData++;
+ if(projection > 13*lengthSquared) modulationData++;
+
+ modulationData = BitUtility::RotateRight(modulationData, 2);
+
+ factor++;
+ }
+ }
+
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->modulationData = modulationData;
+ }
+ }
+}
+
+//============================================================================
+
+typedef Interval<ColorRgba<unsigned char> > ColorRgbaBoundingBox;
+
+static void CalculateBoundingBox(ColorRgbaBoundingBox& cbb, const RgbaBitmap& bitmap, int blockX, int blockY)
+{
+ int size = bitmap.GetBitmapWidth();
+ const ColorRgba<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
+
+ cbb.min = data[0];
+ cbb.max = data[0];
+
+ cbb |= data[1];
+ cbb |= data[2];
+ cbb |= data[3];
+
+ cbb |= data[size];
+ cbb |= data[size+1];
+ cbb |= data[size+2];
+ cbb |= data[size+3];
+
+ cbb |= data[2*size];
+ cbb |= data[2*size+1];
+ cbb |= data[2*size+2];
+ cbb |= data[2*size+3];
+
+ cbb |= data[3*size];
+ cbb |= data[3*size+1];
+ cbb |= data[3*size+2];
+ cbb |= data[3*size+3];
+}
+
+void PvrTcEncoder::EncodeRgba4Bpp(void* result, const RgbaBitmap& bitmap)
+{
+ assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
+ assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
+ const int size = bitmap.GetBitmapWidth();
+ const int blocks = size / 4;
+ const int blockMask = blocks-1;
+
+ PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
+
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ ColorRgbaBoundingBox cbb;
+ CalculateBoundingBox(cbb, bitmap, x, y);
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->usePunchthroughAlpha = 0;
+ packet->SetColorA(cbb.min);
+ packet->SetColorB(cbb.max);
+ }
+ }
+
+ for(int y = 0; y < blocks; ++y)
+ {
+ for(int x = 0; x < blocks; ++x)
+ {
+ const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
+ const ColorRgba<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
+
+ uint32_t modulationData = 0;
+
+ for(int py = 0; py < 4; ++py)
+ {
+ const int yOffset = (py < 2) ? -1 : 0;
+ const int y0 = (y + yOffset) & blockMask;
+ const int y1 = (y0+1) & blockMask;
+
+ for(int px = 0; px < 4; ++px)
+ {
+ const int xOffset = (px < 2) ? -1 : 0;
+ const int x0 = (x + xOffset) & blockMask;
+ const int x1 = (x0+1) & blockMask;
+
+ const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
+ const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
+ const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
+ const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
+
+ ColorRgba<int> ca = p0->GetColorRgbaA() * (*factor)[0] +
+ p1->GetColorRgbaA() * (*factor)[1] +
+ p2->GetColorRgbaA() * (*factor)[2] +
+ p3->GetColorRgbaA() * (*factor)[3];
+
+ ColorRgba<int> cb = p0->GetColorRgbaB() * (*factor)[0] +
+ p1->GetColorRgbaB() * (*factor)[1] +
+ p2->GetColorRgbaB() * (*factor)[2] +
+ p3->GetColorRgbaB() * (*factor)[3];
+
+ const ColorRgba<unsigned char>& pixel = data[py*size + px];
+ ColorRgba<int> d = cb - ca;
+ ColorRgba<int> p;
+ p.r=pixel.r*16;
+ p.g=pixel.g*16;
+ p.b=pixel.b*16;
+ p.a=pixel.a*16;
+ ColorRgba<int> v = p - ca;
+
+ // PVRTC uses weightings of 0, 3/8, 5/8 and 1
+ // The boundaries for these are 3/16, 1/2 (=8/16), 13/16
+ int projection = (v % d) * 16;
+ int lengthSquared = d % d;
+ if(projection > 3*lengthSquared) modulationData++;
+ if(projection > 8*lengthSquared) modulationData++;
+ if(projection > 13*lengthSquared) modulationData++;
+
+ modulationData = BitUtility::RotateRight(modulationData, 2);
+
+ factor++;
+ }
+ }
+
+ PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+ packet->modulationData = modulationData;
+ }
+ }
+}
+
+//============================================================================
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 04:44:56 +0000