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authoraxis <qt-info@nokia.com>2009-04-24 11:34:15 (GMT)
committeraxis <qt-info@nokia.com>2009-04-24 11:34:15 (GMT)
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treea17e1a767a89542ab59907462206d7dcf2e504b2 /src/opengl/util/composition_mode_exclusion.glsl
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Long live Qt for S60!
Diffstat (limited to 'src/opengl/util/composition_mode_exclusion.glsl')
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1 files changed, 9 insertions, 0 deletions
diff --git a/src/opengl/util/composition_mode_exclusion.glsl b/src/opengl/util/composition_mode_exclusion.glsl
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+// Dca' = (Sca.Da + Dca.Sa - 2.Sca.Dca) + Sca.(1 - Da) + Dca.(1 - Sa)
+// Da' = Sa + Da - Sa.Da
+vec4 composite(vec4 src, vec4 dst)
+{
+ vec4 result;
+ result.rgb = (src.rgb * dst.a + dst.rgb * src.a - 2 * src.rgb * dst.rgb) + src.rgb * (1 - dst.a) + dst.rgb * (1 - src.a);
+ result.a = src.a + dst.a - src.a * dst.a;
+ return result;
+}