29 lines
913 B
HLSL
29 lines
913 B
HLSL
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#ifndef POI_ALPHA_TO_COVERAGE
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#define POI_ALPHA_TO_COVERAGE
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half _MainMipScale;
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float _MainAlphaToCoverage;
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float CalcMipLevel(float2 texture_coord)
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{
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float2 dx = ddx(texture_coord);
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float2 dy = ddy(texture_coord);
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float delta_max_sqr = max(dot(dx, dx), dot(dy, dy));
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return 0.5 * log2(delta_max_sqr);
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}
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void ApplyAlphaToCoverage(inout float4 finalColor)
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{
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// Force Model Opacity to 1 if desired
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UNITY_BRANCH
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if (_MainAlphaToCoverage)
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{
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// rescale alpha by mip level
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finalColor.a *= 1 + max(0, CalcMipLevel(poiMesh.uv[0] * _MainTex_TexelSize.zw)) * _MainMipScale;
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// rescale alpha by partial derivative
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finalColor.a = (finalColor.a - _Clip) / max(fwidth(finalColor.a), 0.0001) + _Clip;
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}
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}
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#endif
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