source: trunk/src/opengl/util/composition_mode_difference.glsl@ 353

Last change on this file since 353 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.

File size: 271 bytes
Line 
1// Dca' = Sca + Dca - 2.min(Sca.Da, Dca.Sa)
2// Da' = Sa + Da - Sa.Da
3vec4 composite(vec4 src, vec4 dst)
4{
5 vec4 result;
6 result.rgb = src.rgb + dst.rgb - 2 * min(src.rgb * dst.a, dst.rgb * src.a);
7 result.a = src.a + dst.a - src.a * dst.a;
8 return result;
9}
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