drewcassidy/nvidia-texture-tools
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Fix DXT1a single color compressor. Compare alpha against 0 instead of 128. Fixes issue 134.

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This commit is contained in:
castano 2010-08-26 16:41:24 +00:00
parent 2996120fe2
commit dcdeead859
5 changed files with 9 additions and 3 deletions
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1
ChangeLog
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@ -4,6 +4,7 @@ NVIDIA Texture Tools version 2.0.9
* Fix the C wrapper and provide methods involving callbacks.
* Improve C# / .NET Wrapper
* Add an XNA Game Studio 3.1 Content Processor to make it easy to utilize NVIDIA Texture Tools in XNA applications.
* Fix single color DXT1a compressor. Fixes issue 134.
NVIDIA Texture Tools version 2.0.8
* Fix float to fixed image conversion. Patch provided by Alex Pfaffe. Fixes issue 121.

2
src/nvtt/CompressDXT.cpp
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@ -255,7 +255,7 @@ void nv::SlowCompressor::compressDXT1a(const CompressionOptions::Private & compr
for (uint i = 0; i < 16; i++)
{
if (rgba.color(i).a < 128) anyAlpha = true;
if (rgba.color(i).a == 0) anyAlpha = true;
else allAlpha = false;
}

2
src/nvtt/OptimalCompressDXT.cpp
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@ -205,7 +205,7 @@ void OptimalCompress::compressDXT1(Color32 c, BlockDXT1 * dxtBlock)
void OptimalCompress::compressDXT1a(Color32 rgba, BlockDXT1 * dxtBlock)
{
if (rgba.a < 128)
if (rgba.a == 0)
{
dxtBlock->col0.u = 0;
dxtBlock->col1.u = 0;

2
src/nvtt/QuickCompressDXT.cpp
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@ -483,7 +483,7 @@ void QuickCompress::compressDXT1a(const ColorBlock & rgba, BlockDXT1 * dxtBlock)
for (uint i = 0; i < 16; i++)
{
if (rgba.color(i).a < 128) {
if (rgba.color(i).a == 0) {
hasAlpha = true;
break;
}

5
src/nvtt/tools/compress.cpp
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@ -419,6 +419,11 @@ int main(int argc, char *argv[])
// compressionOptions.setPixelFormat(16, 0, 0, 0);
}
}
if (format == nvtt::Format_BC1a) {
compressionOptions.setQuantization(false, true, true, 127);
}
if (fast)
{
compressionOptions.setQuality(nvtt::Quality_Fastest);