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