33 lines
616 B
HLSL
33 lines
616 B
HLSL
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#ifndef UNITY_POSTFX_FOG
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#define UNITY_POSTFX_FOG
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half4 _FogColor;
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float3 _FogParams;
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#define FOG_DENSITY _FogParams.x
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#define FOG_START _FogParams.y
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#define FOG_END _FogParams.z
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half ComputeFog(float z)
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{
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half fog = 0.0;
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#if FOG_LINEAR
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fog = (FOG_END - z) / (FOG_END - FOG_START);
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#elif FOG_EXP
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fog = exp2(-FOG_DENSITY * z);
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#else // FOG_EXP2
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fog = FOG_DENSITY * z;
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fog = exp2(-fog * fog);
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#endif
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return saturate(fog);
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}
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float ComputeFogDistance(float depth)
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{
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float dist = depth * _ProjectionParams.z;
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dist -= _ProjectionParams.y;
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return dist;
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}
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#endif // UNITY_POSTFX_FOG
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