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Two enhancements:

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1. Make sure to use the same lerping code for both modulation modes when decompressing.
2. Accept a flag during decompression that outputs the debug images that were computed during decompression.
This commit is contained in:
Pavel Krajcevski 2013-09-06 01:53:10 -04:00
parent 7403e77d4d
commit db914018f1
2 changed files with 49 additions and 24 deletions
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4
PVRTCEncoder/include/PVRTCCompressor.h
View file

@ -68,7 +68,9 @@ namespace PVRTCC {
// Takes a stream of compressed PVRTC data and decompresses it into R8G8B8A8
// format. The width and height must be specified in order to properly
// decompress the data.
void Decompress(const DecompressionJob &, const EWrapMode wrapMode = eWrapMode_Clamp);
void Decompress(const DecompressionJob &,
const EWrapMode wrapMode = eWrapMode_Clamp,
bool bDebugImages = false);
} // namespace PVRTCC

69
PVRTCEncoder/src/Decompressor.cpp
View file

@ -84,7 +84,9 @@ namespace PVRTCC {
return x | (y << 1);
}
void Decompress(const DecompressionJob &dcj, const EWrapMode wrapMode) {
void Decompress(const DecompressionJob &dcj,
const EWrapMode wrapMode,
bool bDebugImages) {
const uint32 w = dcj.width;
const uint32 h = dcj.height;
@ -134,19 +136,27 @@ namespace PVRTCC {
// bit depth.
const uint8 scaleDepths[4] = { 4, 5, 5, 5 };
imgA.ChangeBitDepth(scaleDepths);
if(bDebugImages)
imgA.DebugOutput("UnscaledImgA");
imgB.ChangeBitDepth(scaleDepths);
if(bDebugImages)
imgB.DebugOutput("UnscaledImgB");
// Bilinearly upscale the images.
imgA.BilinearUpscale(2, wrapMode);
imgB.BilinearUpscale(2, wrapMode);
// Change the bitdepth to full resolution
const uint8 fullDepths[4] = { 8, 8, 8, 8 };
imgA.ChangeBitDepth(fullDepths);
imgB.ChangeBitDepth(fullDepths);
imgA.ExpandTo8888();
if(bDebugImages)
imgA.DebugOutput("ScaledImgA");
imgB.ExpandTo8888();
if(bDebugImages)
imgB.DebugOutput("ScaledImgB");
// Pack the pixels based on their modulation into the resulting buffer
// in RGBA format...
Image modulation(h, w);
for(uint32 j = 0; j < h; j++) {
for(uint32 i = 0; i < w; i++) {
const uint32 blockIdx = (j/4) * blocksW + (i / 4);
@ -157,10 +167,11 @@ namespace PVRTCC {
const Pixel &pb = imgB(i, j);
Pixel result;
bool punchThrough = false;
uint8 lerpVal = 0;
if(b.GetModeBit()) {
const uint8 lerpVals[3] = { 0, 4, 8 };
const uint8 lerpVals[3] = { 8, 4, 0 };
uint8 modVal = b.GetLerpValue(texelIndex);
bool punchThrough = false;
if(modVal == 2) {
modVal = 1;
@ -169,35 +180,47 @@ namespace PVRTCC {
modVal = 2;
}
const uint8 lerpVal = lerpVals[modVal];
for(uint32 c = 0; c < 4; c++) {
int16 va = static_cast<int16>(pa.Component(c));
int16 vb = static_cast<int16>(pb.Component(c));
result.Component(c) = va + ((vb - va) * lerpVal) / 8;
}
if(punchThrough) {
result.A() = 0;
}
lerpVal = lerpVals[modVal];
} else {
const uint8 lerpVals[4] = { 8, 5, 3, 0 };
const uint8 lerpVal = lerpVals[b.GetLerpValue(texelIndex)];
lerpVal = lerpVals[b.GetLerpValue(texelIndex)];
}
for(uint32 c = 0; c < 4; c++) {
int16 va = static_cast<int16>(pa.Component(c));
int16 vb = static_cast<int16>(pb.Component(c));
for(uint32 c = 0; c < 4; c++) {
uint16 va = static_cast<uint16>(pa.Component(c));
uint16 vb = static_cast<uint16>(pb.Component(c));
result.Component(c) = (va * (8 - lerpVal) + vb * lerpVal) / 8;
uint16 res = (va * (8 - lerpVal) + vb * lerpVal) / 8;
result.Component(c) = static_cast<uint8>(res);
}
if(bDebugImages) {
Pixel iv;
const uint8 modDepth[4] = { 8, 3, 3, 3 };
iv.ChangeBitDepth(modDepth);
iv.A() = punchThrough? 0 : 0xFF;
for(int i = 1; i < 4; i++) {
if(lerpVal == 8) {
iv.Component(i) = 7;
} else {
iv.Component(i) = lerpVal;
}
}
modulation(i, j) = iv;
}
if(punchThrough) {
result.A() = 0;
}
uint32 *outPixels = reinterpret_cast<uint32 *>(dcj.outBuf);
outPixels[(j * h) + i] = result.PackRGBA();
}
}
if(bDebugImages) {
modulation.DebugOutput("DebugModulation");
}
}
} // namespace PVRTCC