Simon Schneegans
6 lines
321 B
GLSL
6 lines
321 B
GLSL
// The Shell.GLSLEffect uses straight alpha blending. This helper method allows
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// compositing color values in the shader in the same way.
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vec4 alphaOver(vec4 under, vec4 over) {
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float alpha = over.a + under.a * (1.0 - over.a);
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return vec4((over.rgb * over.a + under.rgb * under.a * (1.0 - over.a)) / alpha, alpha);
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} |