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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:34:13 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:34:13 (GMT)
commit67ad0519fd165acee4a4d2a94fa502e9e4847bd0 (patch)
tree1dbf50b3dff8d5ca7e9344733968c72704eb15ff /src/opengl/util/composition_mode_lighten.glsl
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Long live Qt!
Diffstat (limited to 'src/opengl/util/composition_mode_lighten.glsl')
-rw-r--r--src/opengl/util/composition_mode_lighten.glsl9
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diff --git a/src/opengl/util/composition_mode_lighten.glsl b/src/opengl/util/composition_mode_lighten.glsl
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+// Dca' = max(Sca.Da, Dca.Sa) + Sca.(1 - Da) + Dca.(1 - Sa)
+// Da' = Sa + Da - Sa.Da
+vec4 composite(vec4 src, vec4 dst)
+{
+ vec4 result;
+ result.rgb = max(src.rgb * dst.a, dst.rgb * src.a) + src.rgb * (1 - dst.a) + dst.rgb * (1 - src.a);
+ result.a = src.a + dst.a - src.a * dst.a;
+ return result;
+}