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DXT1a single color compressor. Fixes issue 131.

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Init single color tables at startup.
This commit is contained in:
castano
2010-07-22 09:23:17 +00:00
parent da548fd03a
commit ac7c017c35
12 changed files with 1384 additions and 1853 deletions
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6
src/nvtt/squish/clusterfit.cpp
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@ -383,8 +383,7 @@ Vec4 ClusterFit::SolveLeastSquares( Vec4& start, Vec4& end ) const
// clamp to the grid
Vec4 const grid( 31.0f, 63.0f, 31.0f, 0.0f );
// Vec4 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f, 0.0f );
Vec4 const gridrcp( 0.03227752766457f, 0.01583151765563f, 0.03227752766457f, 0.0f ); // IC: use approximate grid fitting.
Vec4 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f, 0.0f );
Vec4 const onethird = VEC4_CONST( 1.0f/3.0f );
Vec4 const twothirds = VEC4_CONST( 2.0f/3.0f );
a = Truncate( MultiplyAdd( grid, a, half ) )*gridrcp;
@ -459,8 +458,7 @@ float ClusterFit::SolveLeastSquares( Vec3& start, Vec3& end ) const
// clamp to the grid
Vec3 const grid( 31.0f, 63.0f, 31.0f );
//Vec3 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f );
Vec3 const gridrcp(0.03227752766457f, 0.01583151765563f, 0.03227752766457f); // IC: use approximate grid fitting.
Vec3 const gridrcp( 1.0f/31.0f, 1.0f/63.0f, 1.0f/31.0f );
Vec3 const half( 0.5f );
a = Floor( grid*a + half )*gridrcp;
b = Floor( grid*b + half )*gridrcp;