source: trunk/src/opengl/util/simple_porter_duff.glsl@ 82

Last change on this file since 82 was 2, checked in by Dmitry A. Kuminov, 16 years ago

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

File size: 454 bytes
Line 
1uniform vec2 porterduff_ab;
2uniform vec3 porterduff_xyz;
3
4vec4 composite(vec4 src, vec4 dst)
5{
6 vec4 result;
7
8 result.xyz = porterduff_ab.x * src.xyz * dst.a
9 + porterduff_ab.y * dst.xyz * src.a
10 + porterduff_xyz.y * src.xyz * (1 - dst.a)
11 + porterduff_xyz.z * dst.xyz * (1 - src.a);
12
13 result.a = dot(porterduff_xyz, vec3(src.a * dst.a, src.a * (1 - dst.a), dst.a * (1 - src.a)));
14
15 return result;
16}
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