Workbench: FXAA Artifacts
When using FXAA when rendering to an image the alpha channel was not correct what lead to visual artifacts. These artifacts come from the FXAA function that overwrites the alpha channel with the original Luma of the texel. In the shader this can be turned on or off. But at the end it always overwrites the alpha with the luminance. We didn't use this feature, but the alpha of the resulting pixel still contained the luma value what lead to render artifacts. By overwriting the alpha channel with the original alpha we remove these artifacts. Reviewed By: fclem Maniphest Tasks: T64947 Differential Revision: https://developer.blender.org/D4924
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@ -8,6 +8,9 @@ uniform vec2 invertedViewportSize;
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void main()
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{
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ivec2 texel = ivec2(gl_FragCoord.xy);
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float alpha = texelFetch(colorBuffer, texel, 0).a;
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FragColor = FxaaPixelShader(
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uvcoordsvar.st, colorBuffer, invertedViewportSize, 1.0, 0.166, 0.0833);
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FragColor.a = alpha;
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}
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