//============================================================================ #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; } } } //============================================================================