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[unity] Fixed SkeletonGraphic shader flickering on low alpha vertex colors in Linear color space. Closes #2128.

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This commit is contained in:
Harald Csaszar 2022-07-27 19:21:34 +02:00
parent 246e5a039b
commit 2b28510acd
2 changed files with 16 additions and 1 deletions
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14
spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-Common.cginc
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@ -39,4 +39,18 @@ inline half4 PMAGammaToTargetSpace(half4 gammaPMAColor) {
#endif
}
// Saturated version to prevent numerical issues that occur at CanvasRenderer
// shader during linear-space PMA vertex color correction (countering automatic Unity conversion).
// Note: Only use this method when the original color.rgb values lie within [0,1] range and
// it's not an HDR color. This method is usually suitable for vertex color.
inline half4 PMAGammaToTargetSpaceSaturated(half4 gammaPMAColor) {
#if UNITY_COLORSPACE_GAMMA
return gammaPMAColor;
#else
return gammaPMAColor.a == 0 ?
half4(GammaToLinearSpace(gammaPMAColor.rgb), gammaPMAColor.a) :
half4(saturate(GammaToLinearSpace(gammaPMAColor.rgb / gammaPMAColor.a)) * gammaPMAColor.a, gammaPMAColor.a);
#endif
}
#endif

3
spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/CGIncludes/Spine-SkeletonGraphic-NormalPass.cginc
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@ -49,7 +49,8 @@ VertexOutput vert (VertexInput IN) {
#else
// Note: CanvasRenderer performs a GammaToTargetSpace conversion on vertex color already,
// however incorrectly assuming straight alpha color.
float4 vertexColor = PMAGammaToTargetSpace(half4(TargetToGammaSpace(IN.color.rgb), IN.color.a));
// Saturated version used to prevent numerical issues of certain low-alpha values.
float4 vertexColor = PMAGammaToTargetSpaceSaturated(half4(TargetToGammaSpace(IN.color.rgb), IN.color.a));
#endif
OUT.color = vertexColor * float4(_Color.rgb * _Color.a, _Color.a); // Combine a PMA version of _Color with vertexColor.
return OUT;