465 lines
14 KiB
C++
465 lines
14 KiB
C++
//============================================================================
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#include "PvrTcEncoder.h"
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#include "AlphaBitmap.h"
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#include "PvrTcPacket.h"
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#include "RgbBitmap.h"
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#include "RgbaBitmap.h"
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#include "MortonTable.h"
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#include "BitUtility.h"
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#include "Interval.h"
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#include <assert.h>
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#include <math.h>
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#include <stdint.h>
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//============================================================================
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using namespace Javelin;
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using Data::MORTON_TABLE;
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//============================================================================
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static const unsigned char MODULATION_LUT[16] =
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{
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0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3
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};
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//============================================================================
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inline unsigned PvrTcEncoder::GetMortonNumber(int x, int y)
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{
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return MORTON_TABLE[x >> 8] << 17 | MORTON_TABLE[y >> 8] << 16 | MORTON_TABLE[x & 0xFF] << 1 | MORTON_TABLE[y & 0xFF];
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}
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//============================================================================
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void PvrTcEncoder::EncodeAlpha2Bpp(void* result, const AlphaBitmap& bitmap)
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{
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int size = bitmap.GetBitmapWidth();
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assert(size == bitmap.GetBitmapHeight());
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assert(BitUtility::IsPowerOf2(size));
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// Blocks in each dimension.
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int xBlocks = size/8;
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int yBlocks = size/4;
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const unsigned char* bitmapData = bitmap.GetRawData();
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PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
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for(int y = 0; y < yBlocks; ++y)
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{
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for(int x = 0; x < xBlocks; ++x)
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{
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->usePunchthroughAlpha = 0;
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packet->colorAIsOpaque = 0;
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packet->colorA = 0x7ff; // White, with 0 alpha
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packet->colorBIsOpaque = 1;
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packet->colorB = 0x7fff; // White with full alpha
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const unsigned char* blockBitmapData = &bitmapData[y*4*size + x*8];
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uint32_t modulationData = 0;
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for(int py = 0; py < 4; ++py)
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{
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const unsigned char* rowBitmapData = blockBitmapData;
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for(int px = 0; px < 8; ++px)
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{
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unsigned char pixel = *rowBitmapData++;
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modulationData = BitUtility::RotateRight(modulationData | (pixel >> 7), 1);
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}
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blockBitmapData += size;
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}
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packet->modulationData = modulationData;
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}
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}
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}
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void PvrTcEncoder::EncodeAlpha4Bpp(void* result, const AlphaBitmap& bitmap)
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{
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int size = bitmap.GetBitmapWidth();
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assert(size == bitmap.GetBitmapHeight());
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assert(BitUtility::IsPowerOf2(size));
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// Blocks in each dimension.
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int blocks = size/4;
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const unsigned char* bitmapData = bitmap.GetRawData();
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PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->usePunchthroughAlpha = 0;
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packet->colorAIsOpaque = 0;
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packet->colorA = 0x7ff; // White, with 0 alpha
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packet->colorBIsOpaque = 1;
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packet->colorB = 0x7fff; // White with full alpha
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const unsigned char* blockBitmapData = &bitmapData[(y*size + x)*4];
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uint32_t modulationData = 0;
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for(int py = 0; py < 4; ++py)
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{
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const unsigned char* rowBitmapData = blockBitmapData;
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for(int px = 0; px < 4; ++px)
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{
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unsigned char pixel = *rowBitmapData++;
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modulationData = BitUtility::RotateRight(modulationData | MODULATION_LUT[pixel>>4], 2);
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}
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blockBitmapData += size;
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}
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packet->modulationData = modulationData;
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}
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}
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}
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//============================================================================
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typedef Interval<ColorRgb<unsigned char> > ColorRgbBoundingBox;
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static void CalculateBoundingBox(ColorRgbBoundingBox& cbb, const RgbBitmap& bitmap, int blockX, int blockY)
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{
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int size = bitmap.GetBitmapWidth();
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const ColorRgb<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
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cbb.min = data[0];
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cbb.max = data[0];
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cbb |= data[1];
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cbb |= data[2];
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cbb |= data[3];
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cbb |= data[size];
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cbb |= data[size+1];
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cbb |= data[size+2];
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cbb |= data[size+3];
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cbb |= data[2*size];
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cbb |= data[2*size+1];
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cbb |= data[2*size+2];
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cbb |= data[2*size+3];
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cbb |= data[3*size];
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cbb |= data[3*size+1];
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cbb |= data[3*size+2];
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cbb |= data[3*size+3];
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}
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void PvrTcEncoder::EncodeRgb4Bpp(void* result, const RgbBitmap& bitmap)
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{
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assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
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assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
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const int size = bitmap.GetBitmapWidth();
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const int blocks = size / 4;
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const int blockMask = blocks-1;
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PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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ColorRgbBoundingBox cbb;
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CalculateBoundingBox(cbb, bitmap, x, y);
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->usePunchthroughAlpha = 0;
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packet->SetColorA(cbb.min);
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packet->SetColorB(cbb.max);
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}
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}
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
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const ColorRgb<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
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uint32_t modulationData = 0;
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for(int py = 0; py < 4; ++py)
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{
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const int yOffset = (py < 2) ? -1 : 0;
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const int y0 = (y + yOffset) & blockMask;
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const int y1 = (y0+1) & blockMask;
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for(int px = 0; px < 4; ++px)
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{
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const int xOffset = (px < 2) ? -1 : 0;
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const int x0 = (x + xOffset) & blockMask;
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const int x1 = (x0+1) & blockMask;
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const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
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const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
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const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
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const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
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ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
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p1->GetColorRgbA() * (*factor)[1] +
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p2->GetColorRgbA() * (*factor)[2] +
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p3->GetColorRgbA() * (*factor)[3];
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ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
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p1->GetColorRgbB() * (*factor)[1] +
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p2->GetColorRgbB() * (*factor)[2] +
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p3->GetColorRgbB() * (*factor)[3];
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const ColorRgb<unsigned char>& pixel = data[py*size + px];
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ColorRgb<int> d = cb - ca;
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ColorRgb<int> p(pixel.r*16, pixel.g*16, pixel.b*16);
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ColorRgb<int> v = p - ca;
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// PVRTC uses weightings of 0, 3/8, 5/8 and 1
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// The boundaries for these are 3/16, 1/2 (=8/16), 13/16
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int projection = (v % d) * 16;
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int lengthSquared = d % d;
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if(projection > 3*lengthSquared) modulationData++;
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if(projection > 8*lengthSquared) modulationData++;
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if(projection > 13*lengthSquared) modulationData++;
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modulationData = BitUtility::RotateRight(modulationData, 2);
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factor++;
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}
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}
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->modulationData = modulationData;
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}
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}
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}
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//============================================================================
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static void CalculateBoundingBox(ColorRgbBoundingBox& cbb, const RgbaBitmap& bitmap, int blockX, int blockY)
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{
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int size = bitmap.GetBitmapWidth();
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const ColorRgba<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
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cbb.min = data[0];
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cbb.max = data[0];
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cbb |= data[1];
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cbb |= data[2];
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cbb |= data[3];
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cbb |= data[size];
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cbb |= data[size+1];
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cbb |= data[size+2];
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cbb |= data[size+3];
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cbb |= data[2*size];
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cbb |= data[2*size+1];
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cbb |= data[2*size+2];
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cbb |= data[2*size+3];
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cbb |= data[3*size];
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cbb |= data[3*size+1];
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cbb |= data[3*size+2];
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cbb |= data[3*size+3];
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}
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void PvrTcEncoder::EncodeRgb4Bpp(void* result, const RgbaBitmap& bitmap)
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{
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assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
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assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
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const int size = bitmap.GetBitmapWidth();
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const int blocks = size / 4;
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const int blockMask = blocks-1;
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PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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ColorRgbBoundingBox cbb;
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CalculateBoundingBox(cbb, bitmap, x, y);
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->usePunchthroughAlpha = 0;
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packet->SetColorA(cbb.min);
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packet->SetColorB(cbb.max);
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}
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}
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
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const ColorRgba<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
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uint32_t modulationData = 0;
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for(int py = 0; py < 4; ++py)
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{
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const int yOffset = (py < 2) ? -1 : 0;
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const int y0 = (y + yOffset) & blockMask;
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const int y1 = (y0+1) & blockMask;
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for(int px = 0; px < 4; ++px)
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{
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const int xOffset = (px < 2) ? -1 : 0;
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const int x0 = (x + xOffset) & blockMask;
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const int x1 = (x0+1) & blockMask;
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const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
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const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
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const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
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const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
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ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
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p1->GetColorRgbA() * (*factor)[1] +
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p2->GetColorRgbA() * (*factor)[2] +
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p3->GetColorRgbA() * (*factor)[3];
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ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
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p1->GetColorRgbB() * (*factor)[1] +
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p2->GetColorRgbB() * (*factor)[2] +
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p3->GetColorRgbB() * (*factor)[3];
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const ColorRgb<unsigned char>& pixel = data[py*size + px];
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ColorRgb<int> d = cb - ca;
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ColorRgb<int> p(pixel.r*16, pixel.g*16, pixel.b*16);
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ColorRgb<int> v = p - ca;
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// PVRTC uses weightings of 0, 3/8, 5/8 and 1
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// The boundaries for these are 3/16, 1/2 (=8/16), 13/16
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int projection = (v % d) * 16;
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int lengthSquared = d % d;
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if(projection > 3*lengthSquared) modulationData++;
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if(projection > 8*lengthSquared) modulationData++;
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if(projection > 13*lengthSquared) modulationData++;
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modulationData = BitUtility::RotateRight(modulationData, 2);
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factor++;
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}
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}
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->modulationData = modulationData;
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}
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}
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}
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//============================================================================
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typedef Interval<ColorRgba<unsigned char> > ColorRgbaBoundingBox;
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static void CalculateBoundingBox(ColorRgbaBoundingBox& cbb, const RgbaBitmap& bitmap, int blockX, int blockY)
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{
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int size = bitmap.GetBitmapWidth();
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const ColorRgba<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
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cbb.min = data[0];
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cbb.max = data[0];
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cbb |= data[1];
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cbb |= data[2];
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cbb |= data[3];
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cbb |= data[size];
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cbb |= data[size+1];
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cbb |= data[size+2];
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cbb |= data[size+3];
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cbb |= data[2*size];
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cbb |= data[2*size+1];
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cbb |= data[2*size+2];
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cbb |= data[2*size+3];
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cbb |= data[3*size];
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cbb |= data[3*size+1];
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cbb |= data[3*size+2];
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cbb |= data[3*size+3];
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}
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void PvrTcEncoder::EncodeRgba4Bpp(void* result, const RgbaBitmap& bitmap)
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{
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assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
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assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
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const int size = bitmap.GetBitmapWidth();
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const int blocks = size / 4;
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const int blockMask = blocks-1;
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PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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ColorRgbaBoundingBox cbb;
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CalculateBoundingBox(cbb, bitmap, x, y);
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->usePunchthroughAlpha = 0;
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packet->SetColorA(cbb.min);
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packet->SetColorB(cbb.max);
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}
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}
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for(int y = 0; y < blocks; ++y)
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{
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for(int x = 0; x < blocks; ++x)
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{
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const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
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const ColorRgba<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
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uint32_t modulationData = 0;
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for(int py = 0; py < 4; ++py)
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{
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const int yOffset = (py < 2) ? -1 : 0;
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const int y0 = (y + yOffset) & blockMask;
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const int y1 = (y0+1) & blockMask;
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for(int px = 0; px < 4; ++px)
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{
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const int xOffset = (px < 2) ? -1 : 0;
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const int x0 = (x + xOffset) & blockMask;
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const int x1 = (x0+1) & blockMask;
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const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
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const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
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const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
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const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
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ColorRgba<int> ca = p0->GetColorRgbaA() * (*factor)[0] +
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p1->GetColorRgbaA() * (*factor)[1] +
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p2->GetColorRgbaA() * (*factor)[2] +
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p3->GetColorRgbaA() * (*factor)[3];
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ColorRgba<int> cb = p0->GetColorRgbaB() * (*factor)[0] +
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p1->GetColorRgbaB() * (*factor)[1] +
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p2->GetColorRgbaB() * (*factor)[2] +
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p3->GetColorRgbaB() * (*factor)[3];
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const ColorRgba<unsigned char>& pixel = data[py*size + px];
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ColorRgba<int> d = cb - ca;
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ColorRgba<int> p(pixel.r*16, pixel.g*16, pixel.b*16, pixel.a*16);
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ColorRgba<int> v = p - ca;
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// PVRTC uses weightings of 0, 3/8, 5/8 and 1
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// The boundaries for these are 3/16, 1/2 (=8/16), 13/16
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int projection = (v % d) * 16;
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int lengthSquared = d % d;
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if(projection > 3*lengthSquared) modulationData++;
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if(projection > 8*lengthSquared) modulationData++;
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if(projection > 13*lengthSquared) modulationData++;
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modulationData = BitUtility::RotateRight(modulationData, 2);
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factor++;
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}
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}
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PvrTcPacket* packet = packets + GetMortonNumber(x, y);
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packet->modulationData = modulationData;
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}
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}
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}
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//============================================================================
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