48 lines
1.4 KiB
HLSL
48 lines
1.4 KiB
HLSL
#include "Common.hlsl"
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bool _EnableDirectionalCaustics;
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float4x4 CausticsProjection;
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TEXTURE2D(_CausticsTex);
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SAMPLER(sampler_CausticsTex);
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float2 GetCausticsProjection(in float4 positionCS, in float3 lightDir, float3 positionWS, inout half attenuation)
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{
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if(_EnableDirectionalCaustics)
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{
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#if ADVANCED_SHADING
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const float3 sceneWorldNormal = ReconstructWorldNormal(positionCS);
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const half NdotL = saturate(dot(sceneWorldNormal, lightDir));
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attenuation *= NdotL;
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#endif
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//CausticsProjection matrix set up through scripting
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return mul(CausticsProjection, float4(positionWS, 1.0)).xy;
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}
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return positionWS.xz;
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}
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float3 SampleCaustics(float2 uv, float2 time, float tiling)
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{
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float3 caustics1 = SAMPLE_TEXTURE2D(_CausticsTex, sampler_CausticsTex, uv * tiling + (time.xy)).rgb;
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float3 caustics2 = SAMPLE_TEXTURE2D(_CausticsTex, sampler_CausticsTex, (uv * tiling * 0.8) - (time.xy)).rgb;
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#if UNITY_COLORSPACE_GAMMA
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caustics1 = SRGBToLinear(caustics1);
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caustics2 = SRGBToLinear(caustics2);
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#endif
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float3 caustics = min(caustics1, caustics2);
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#if HQ_CAUSTICS
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float3 caustics3 = SAMPLE_TEXTURE2D(_CausticsTex, sampler_CausticsTex, (uv * tiling * 0.6) + (time.xy * 1.2)).rgb * 1;
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float3 caustics4 = SAMPLE_TEXTURE2D(_CausticsTex, sampler_CausticsTex, (uv * tiling * 0.55) - (time.xy * 1.2)).rgb * 1;
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caustics4 = min(caustics3, caustics4);
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caustics = min(caustics, caustics4) * 2.0;
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#endif
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return caustics;
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} |