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//============================================================================
#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++;
}
}
}
}
}
//============================================================================
|