drewcassidy/nvidia-texture-tools
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Try 4-means.

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This commit is contained in:
castano 2008-11-22 08:37:14 +00:00
parent 11073171a1
commit 41f6e0ba73
1 changed files with 11 additions and 1 deletions
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12
src/nvtt/QuickCompressDXT.cpp
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@ -24,6 +24,7 @@
#include <nvcore/Containers.h> // swap
#include <nvmath/Color.h>
#include <nvmath/Fitting.h>
#include <nvimage/ColorBlock.h>
#include <nvimage/BlockDXT.h>
@ -452,7 +453,8 @@ void QuickCompress::compressDXT1(const ColorBlock & rgba, BlockDXT1 * dxtBlock)
// read block
Vector3 block[16];
extractColorBlockRGB(rgba, block);
#if 0
// find min and max colors
Vector3 maxColor, minColor;
findMinMaxColorsBox(block, 16, &maxColor, &minColor);
@ -460,6 +462,14 @@ void QuickCompress::compressDXT1(const ColorBlock & rgba, BlockDXT1 * dxtBlock)
selectDiagonal(block, 16, &maxColor, &minColor);
insetBBox(&maxColor, &minColor);
#endif
float weights[16] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
Vector3 cluster[4];
Compute4Means(16, block, weights, Vector3(1, 1, 1), cluster);
Vector3 maxColor = cluster[0];
Vector3 minColor = cluster[3];
uint16 color0 = roundAndExpand(&maxColor);
uint16 color1 = roundAndExpand(&minColor);