备份CatanBuilding瘦身独立工程

LocalPackages/StylizedWater2/Shaders/Libraries/Caustics.hlsl

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