32 lines
1,007 B
HLSL
32 lines
1,007 B
HLSL
|
#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 (_Mode == 1)
|
||
|
|
{
|
||
|
|
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 - _Cutoff) / max(fwidth(finalColor.a), 0.0001) + _Cutoff;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|