fix: caustics and shadow fixes

features/Water Lighting/Shaders/WaterLighting/WaterCaustics.hlsli

@@ -2,71 +2,46 @@ Texture2D<float4> WaterCaustics : register(t70);
 
 namespace WaterLighting
 {
-	//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-	// Caustics
-	//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
 	float2 PanCausticsUV(float2 uv, float speed, float tiling)
 	{
-		return (float2(1, 0) * Timer * speed) + (uv * tiling);
+		return frac((float2(1, 0) * Timer * speed) + (uv * tiling));
 	}
 
 	float3 SampleCaustics(float2 uv)
 	{
 		return WaterCaustics.Sample(SampColorSampler, uv).r;
 	}
 
-	float3 ComputeCaustics(float2 uv)
-	{
-		float2 causticsUV = uv * 10.0;
-
-		float2 causticsUV1 = PanCausticsUV(causticsUV, 0.5 * 0.2, 1.0);
-		float2 causticsUV2 = PanCausticsUV(causticsUV, 1.0 * 0.2, -0.5);
-
-		float3 caustics1 = SampleCaustics(causticsUV1);
-		float3 caustics2 = SampleCaustics(causticsUV2);
-
-		float3 caustics = min(caustics1, caustics2) * 5.0;
-
-		return caustics;
-	}
-
-	float3 ComputeCaustics(float4 waterData, float3 worldPosition, float3 worldSpaceNormal)
+	float3 ComputeCaustics(float4 waterData, float3 worldPosition, uint eyeIndex)
 	{
 		float causticsDistToWater = waterData.w - worldPosition.z;
 		float shoreFactorCaustics = saturate(causticsDistToWater / 64.0);
-		float upAmount = worldSpaceNormal.z * 0.5 + 0.5;
-
-		float causticsAmount = shoreFactorCaustics * upAmount;
 
-		if (causticsAmount > 0.0) {
+		if (shoreFactorCaustics > 0.0) {
 			float causticsFade = 1.0 - saturate(causticsDistToWater / 1024.0);
 			causticsFade *= causticsFade;
 
-			float2 causticsUV = (worldPosition.xy + CameraPosAdjust[0].xy) * 0.005;
+			float2 causticsUV = (worldPosition.xy + CameraPosAdjust[eyeIndex].xy) * 0.005;
 
 			float2 causticsUV1 = PanCausticsUV(causticsUV, 0.5 * 0.2, 1.0);
 			float2 causticsUV2 = PanCausticsUV(causticsUV, 1.0 * 0.2, -0.5);
 
-			float3 caustics1 = SampleCaustics(causticsUV1);
-			float3 caustics2 = SampleCaustics(causticsUV2);
-
-			float3 causticsHigh = min(caustics1, caustics2) * 5.0;
+			float3 causticsHigh = 1.0;
+
+			if (causticsFade > 0.0)
+				causticsHigh = min(SampleCaustics(causticsUV1), SampleCaustics(causticsUV2));
 
 			causticsUV *= 0.5;
 
 			causticsUV1 = PanCausticsUV(causticsUV, 0.5 * 0.1, 1.0);
 			causticsUV2 = PanCausticsUV(causticsUV, 1.0 * 0.1, -0.5);
 
-			caustics1 = SampleCaustics(causticsUV1);
-			caustics2 = SampleCaustics(causticsUV2);
-
-			float3 causticsLow = sqrt(min(caustics1, caustics2));
+			float3 causticsLow = 1.0;
 
-			float3 caustics = lerp(causticsLow, causticsHigh, causticsFade);
-			caustics = lerp(causticsLow, caustics, upAmount);
+			if (causticsFade < 1.0)
+				causticsLow = min(SampleCaustics(causticsUV1), SampleCaustics(causticsUV2));
 
-			return lerp(1.0, caustics, shoreFactorCaustics * upAmount);
+			return lerp(causticsLow * 4.0, causticsHigh * 4.0, causticsFade);
 		}
 
 		return 1.0;

package/Shaders/Lighting.hlsl

@@ -1855,7 +1855,7 @@ PS_OUTPUT main(PS_INPUT input, bool frontFace
 	float3 dirLightColorMultiplier = 1;
 
 #	if defined(WATER_LIGHTING)
-	dirLightColorMultiplier *= WaterLighting::ComputeCaustics(waterData, input.WorldPosition.xyz, worldSpaceNormal);
+	dirLightColorMultiplier *= WaterLighting::ComputeCaustics(waterData, input.WorldPosition.xyz, eyeIndex);
 #	endif
 
 	float selfShadowFactor = 1.0f;

package/Shaders/RunGrass.hlsl

@@ -412,6 +412,10 @@ cbuffer AlphaTestRefCB : register(b11)
 #		include "Skylighting/Skylighting.hlsli"
 #	endif
 
+#	if defined(WATER_LIGHTING)
+#		include "WaterLighting/WaterCaustics.hlsli"
+#	endif
+
 #	ifdef GRASS_LIGHTING
 #		if defined(TRUE_PBR)
 
@@ -540,7 +544,7 @@ PS_OUTPUT main(PS_INPUT input, bool frontFace
 	float dirShadow = !InInterior ? shadowColor.x : 1.0;
 	float dirDetailShadow = 1.0;
 
-	if (dirShadow > 0.0) {
+	if (dirShadow > 0.0 && !InInterior) {
 		if (dirLightAngle > 0.0) {
 #			if defined(SCREEN_SPACE_SHADOWS)
 			dirDetailShadow = ScreenSpaceShadows::GetScreenSpaceShadow(input.HPosition.xyz, screenUV, screenNoise, eyeIndex);
@@ -555,10 +559,17 @@ PS_OUTPUT main(PS_INPUT input, bool frontFace
 #			endif  // TERRAIN_SHADOWS
 
 #			if defined(CLOUD_SHADOWS)
-		if (dirShadow != 0.0) {
+		if (dirShadow > 0.0) {
 			dirShadow *= CloudShadows::GetCloudShadowMult(input.WorldPosition.xyz, SampBaseSampler);
 		}
 #			endif  // CLOUD_SHADOWS
+
+#			if defined(WATER_LIGHTING)
+		if (dirShadow > 0.0) {
+			float4 waterData = SharedData::GetWaterData(input.WorldPosition.xyz);
+			dirShadow *= WaterLighting::ComputeCaustics(waterData, input.WorldPosition.xyz, eyeIndex);
+		}
+#			endif
 	}
 
 	float3 diffuseColor = 0;
@@ -764,10 +775,9 @@ PS_OUTPUT main(PS_INPUT input)
 	float4 shadowColor = TexShadowMaskSampler.Load(int3(input.HPosition.xy, 0));
 
 	float dirShadow = !InInterior ? shadowColor.x : 1.0;
-
 	float dirDetailShadow = 1.0;
 
-	if (dirShadow > 0.0) {
+	if (dirShadow > 0.0 && !InInterior) {
 #			if defined(SCREEN_SPACE_SHADOWS)
 		dirDetailShadow = ScreenSpaceShadows::GetScreenSpaceShadow(input.HPosition.xyz, screenUV, screenNoise, eyeIndex);
 #			endif  // SCREEN_SPACE_SHADOWS
@@ -780,10 +790,17 @@ PS_OUTPUT main(PS_INPUT input)
 #			endif  // TERRAIN_SHADOWS
 
 #			if defined(CLOUD_SHADOWS)
-		if (dirShadow != 0.0) {
+		if (dirShadow > 0.0) {
 			dirShadow *= CloudShadows::GetCloudShadowMult(input.WorldPosition.xyz, SampBaseSampler);
 		}
 #			endif  // CLOUD_SHADOWS
+
+#			if defined(WATER_LIGHTING)
+		if (dirShadow > 0.0) {
+			float4 waterData = SharedData::GetWaterData(input.WorldPosition.xyz);
+			dirShadow *= WaterLighting::ComputeCaustics(waterData, input.WorldPosition.xyz, eyeIndex);
+		}
+#			endif
 	}
 
 	float3 diffuseColor = DirLightColorShared.xyz * dirShadow * lerp(dirDetailShadow, 1.0, 0.5) * 0.5;