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🪲 Fix issue #272

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Simon Schneegans
2023-01-08 19:46:48 +01:00
parent d87e84846d
commit 2fa10bb706
1 changed files with 4 additions and 0 deletions
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resources/shaders/common.glsl
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@@ -121,6 +121,10 @@ void setOutputColor(vec4 outColor) { cogl_color_out = outColor; }
// The Shell.GLSLEffect uses straight alpha blending. This helper method allows // The Shell.GLSLEffect uses straight alpha blending. This helper method allows
// compositing color values in the shader in the same way. // compositing color values in the shader in the same way.
vec4 alphaOver(vec4 under, vec4 over) { vec4 alphaOver(vec4 under, vec4 over) {
if (under.a == 0.0 && over.a == 0.0) {
return vec4(0.0);
}
float alpha = mix(under.a, 1.0, over.a); float alpha = mix(under.a, 1.0, over.a);
return vec4(mix(under.rgb * under.a, over.rgb, over.a) / alpha, alpha); return vec4(mix(under.rgb * under.a, over.rgb, over.a) / alpha, alpha);
} }