//============================================================================ #include "PvrTcDecoder.h" #include "PvrTcPacket.h" #include "MortonTable.h" #include <assert.h> //============================================================================ using namespace Javelin; using Data::MORTON_TABLE; //============================================================================ inline unsigned PvrTcDecoder::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 PvrTcDecoder::DecodeRgb4Bpp(ColorRgb<unsigned char>* result, const Point2<int>& size, const void* data) { assert(size.x == size.y); const int blocks = size.x / 4; const int blockMask = blocks-1; const PvrTcPacket* packets = static_cast<const PvrTcPacket*>(data); for(int y = 0; y < blocks; ++y) { for(int x = 0; x < blocks; ++x) { const PvrTcPacket* packet = packets + GetMortonNumber(x, y); unsigned mod = packet->modulationData; const unsigned char (*weights)[4] = PvrTcPacket::WEIGHTS + 4*packet->usePunchthroughAlpha; const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS; 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 unsigned char* w = weights[mod&3]; ColorRgb<unsigned char> c; c.r = (ca.r * w[0] + cb.r * w[1]) >> 7; c.g = (ca.g * w[0] + cb.g * w[1]) >> 7; c.b = (ca.b * w[0] + cb.b * w[1]) >> 7; result[(py+y*4)*size.x + (px+x*4)] = c; mod >>= 2; factor++; } } } } } void PvrTcDecoder::DecodeRgba4Bpp(ColorRgba<unsigned char>* result, const Point2<int>& size, const void* data) { assert(size.x == size.y); const int blocks = size.x / 4; const int blockMask = blocks-1; const PvrTcPacket* packets = static_cast<const PvrTcPacket*>(data); for(int y = 0; y < blocks; ++y) { for(int x = 0; x < blocks; ++x) { const PvrTcPacket* packet = packets + GetMortonNumber(x, y); unsigned mod = packet->modulationData; const unsigned char (*weights)[4] = PvrTcPacket::WEIGHTS + 4*packet->usePunchthroughAlpha; const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS; 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 unsigned char* w = weights[mod&3]; ColorRgba<unsigned char> c; c.r = (ca.r * w[0] + cb.r * w[1]) >> 7; c.g = (ca.g * w[0] + cb.g * w[1]) >> 7; c.b = (ca.b * w[0] + cb.b * w[1]) >> 7; c.a = (ca.a * w[2] + cb.a * w[3]) >> 7; result[(py+y*4)*size.x + (px+x*4)] = c; mod >>= 2; factor++; } } } } } //============================================================================