32 lines
1.1 KiB
HLSL
32 lines
1.1 KiB
HLSL
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#ifndef CAUSTIC_INCLUDED
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#define CAUSTIC_INCLUDED
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#include "PCommon.cginc"
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#include "PDepth.cginc"
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void SampleCausticTexture(float sceneDepth, float surfaceDepth, float3 fragWorldPos, float3 worldNormal, out half4 causticColor)
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{
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fragWorldPos -= worldNormal * _CausticDistortionStrength;
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float fragToCamSqrDistance = SqrDistance(fragWorldPos, _WorldSpaceCameraPos.xyz);
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float refWorldPosToCamSqrDistance = (sceneDepth * sceneDepth * fragToCamSqrDistance) / (surfaceDepth * surfaceDepth);
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float3 fragWorldDir = normalize(fragWorldPos - _WorldSpaceCameraPos.xyz);
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float3 refWorldPos = fragWorldDir * sqrt(refWorldPosToCamSqrDistance) + _WorldSpaceCameraPos.xyz;
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float2 uv = refWorldPos.xz / (_CausticSize + 0.0000001);
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causticColor = tex2D(_CausticTex, uv + _PoseidonTime * 0.0125).r;
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causticColor *= _CausticStrength;
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float fade = lerp(0.25, 1, NoiseTexFrag(uv * 0.05 - _PoseidonTime * 0.0125));
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//#if LIGHT_ABSORPTION
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// float waterDepth = sceneDepth - surfaceDepth;
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// float depthFade = 1 - saturate(InverseLerpUnclamped(0, _MaxDepth, waterDepth));
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// fade *= depthFade;
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//#endif
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causticColor *= fade;
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causticColor = saturate(causticColor);
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}
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#endif
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