[A] color [M] NDC position insted screen pos

Assets/Settings/URP-Performant.asset

@@ -20,8 +20,8 @@ MonoBehaviour:
   - {fileID: 11400000, guid: 707360a9c581a4bd7aa53bfeb1429f71, type: 2}
   m_DefaultRendererIndex: 0
   m_RequireDepthTexture: 1
-  m_RequireOpaqueTexture: 0
+  m_RequireOpaqueTexture: 1
-  m_OpaqueDownsampling: 1
+  m_OpaqueDownsampling: 0
   m_SupportsTerrainHoles: 1
   m_SupportsHDR: 0
   m_HDRColorBufferPrecision: 0

Packages/zzwater/Mats/Ocean.mat

@@ -90,6 +90,8 @@ Material:
     - _ClearCoatSmoothness: 0
     - _Cull: 2
     - _Cutoff: 0.5
+    - _DepthHorizontal: 1.39
+    - _DepthVertical: 3.69
     - _DetailAlbedoMapScale: 1
     - _DetailNormalMapScale: 1
     - _DstBlend: 0
@@ -119,10 +121,11 @@ Material:
     - _WorkflowMode: 1
     - _ZWrite: 1
     m_Colors:
-    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
+    - _BaseColor: {r: 0.024964403, g: 0.23726082, b: 0.4811321, a: 0.8862745}
     - _Color: {r: 1, g: 1, b: 1, a: 1}
     - _Direction: {r: 0, g: -1, b: 0, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _ShallowColor: {r: 0.06430225, g: 0.8018868, b: 0.79103994, a: 0.27450982}
     - _SpecColor: {r: 0.19999996, g: 0.19999996, b: 0.19999996, a: 1}
     - _WaveDirection: {r: 1, g: 1, b: 1, a: 1}
     - _WaveFadeDistance: {r: 150, g: 300, b: 0, a: 0}

Packages/zzwater/shaders/libs/Common.hlsl

@@ -25,6 +25,7 @@ struct WaterSurface
 	float3 albedo;
 	float3 offset;
 	float alpha;
+    float fog;
 };
 
 struct SceneDepth
@@ -40,15 +41,16 @@ struct SceneDepth
 #define DEPTH_SCALAR (FAR_CLIP - NEAR_CLIP)
 
 //Return depth based on the used technique (buffer, vertex color, baked texture)
-SceneDepth SampleDepth(float4 screenPos)
+SceneDepth SampleDepth(float4 positionNDC)
 {
 	SceneDepth depth = (SceneDepth)0;
 	
-	screenPos.xyz /= screenPos.w;
+	positionNDC.xy /= positionNDC.w;
 
-	depth.raw = SampleSceneDepth(screenPos.xy);
+	float raw = SampleSceneDepth(positionNDC.xy);
-	depth.eye = LinearEyeDepth(depth.raw, _ZBufferParams);
+    depth.raw = raw;
-	depth.linear01 = Linear01Depth(depth.raw, _ZBufferParams) * DEPTH_SCALAR;
+	depth.eye = LinearEyeDepth(raw, _ZBufferParams);
+	depth.linear01 = Linear01Depth(raw, _ZBufferParams) * DEPTH_SCALAR;
 
 	return depth;
 }

Packages/zzwater/shaders/libs/ForwardPass.hlsl

@@ -1,7 +1,7 @@
 
 struct SceneData
 {
-	float4 positionSS; //Unnormalized
+	float4 positionNDC; //Unnormalized
 	float2 screenPos; //Normalized and no refraction
 	float3 positionWS;
 
@@ -9,18 +9,18 @@ struct SceneData
 	float verticalDepth;
 };
 
-void PopulateSceneData(inout SceneData scene, in Varyings input, in WaterSurface water, in float3 camPos)
+void PopulateSceneData(inout SceneData scene, in Varyings input, in WaterSurface water)
 {
-    scene.positionSS = input.screenPos;
+    scene.positionNDC = input.positionNDC;
-    scene.screenPos = input.screenPos.xy / input.screenPos.w;
+    scene.screenPos = input.positionNDC.xy / input.positionNDC.w;
 
 	//Default for disabled depth texture
 	scene.viewDepth = 1;
 	scene.verticalDepth = 1;
 
 	//Screen depth Projection to world position
-	SceneDepth depth = SampleDepth(scene.positionSS);
+	SceneDepth depth = SampleDepth(input.positionNDC);
-    float3 projWorldPos = depth.eye * (water.viewDir / input.screenPos.w) - camPos; 
+    float3 projWorldPos = depth.eye * (water.viewDelta / input.positionNDC.w) - _WorldSpaceCameraPos; 
     scene.positionWS = -projWorldPos;
 
 	const float sceneDepth = depth.eye;
@@ -33,12 +33,24 @@ void PopulateSceneData(inout SceneData scene, in Varyings input, in WaterSurface
 	//scene.verticalDepth = DepthDistance(water.positionWS, scene.positionWS, water.waveNormal * normalSign);
 }
 
+float GetWaterDensity(SceneData scene, float heightScalar, float viewDepthScalar)
+{
+	//Best default value, otherwise water just turns invisible (infinitely shallow)
+	float density = 1.0;
+	
+	float viewDepth = scene.viewDepth;
+	float verticalDepth = scene.verticalDepth;
+
+	float depthAttenuation = 1.0 - exp(-viewDepth * viewDepthScalar * 0.1);
+	float heightAttenuation = saturate(verticalDepth * heightScalar);
+	
+	return max(depthAttenuation, heightAttenuation);
+}
+
 float4 ForwardPassFragment(Varyings input) : SV_Target
 {
     WaterSurface water = (WaterSurface)0;
     SceneData scene = (SceneData)0;
-    float3 camPos = GetCurrentViewPosition();
-
 
 	float3 normalWS = normalize(input.normalWS.xyz);
 	float3 WorldTangent = input.tangent.xyz;
@@ -48,14 +60,20 @@ float4 ForwardPassFragment(Varyings input) : SV_Target
 
     water.alpha = 1.0;
     water.positionWS = positionWS;
-    water.viewDelta = camPos - scene.positionWS;
+    water.viewDelta = _WorldSpaceCameraPos - positionWS;
     water.viewDir = normalize(water.viewDelta);
     water.vertexNormal = normalize(input.normalWS.xyz);
 
 	half VdotN = 1.0 - saturate(dot(water.viewDir, normalWS));
 
 
-	PopulateSceneData(scene, input, water, camPos);
+	PopulateSceneData(scene, input, water);
 
-    return float4(scene.viewDepth.xxx, 1);
+    //return float4(scene.verticalDepth.xxx, 1);
+
+	water.fog = GetWaterDensity(scene, _DepthHorizontal, _DepthVertical);
+
+	//Albedo
+	float4 baseColor = lerp(_ShallowColor, _BaseColor, water.fog);
+    return baseColor;
 }

Packages/zzwater/shaders/libs/Input.hlsl

@@ -4,6 +4,12 @@ CBUFFER_START(UnityPerMaterial)
 	float2 _Direction;
 	float _Speed;
 
+    //Color + Transparency
+    half4 _BaseColor;
+    half4 _ShallowColor;
+    float _DepthVertical;
+    float _DepthHorizontal;
+
     //Waves
 	float _WaveSpeed;
 	half _WaveHeight;

Packages/zzwater/shaders/libs/Vertex.hlsl

@@ -22,7 +22,7 @@ struct Varyings
 	//wPos.z in w-component
 	float4 bitangent 	: TEXCOORD4;
 
-	float4 screenPos 	: TEXCOORD5;
+	float4 positionNDC 	: TEXCOORD5;
 	
 	float4 positionCS 	: SV_POSITION;
 	
@@ -53,9 +53,14 @@ Varyings LitPassVertex(Attributes input)
 	//Apply vertex displacements
 	positionWS += waves.position.xyz;
 
-	output.positionCS = TransformWorldToHClip(positionWS);
+    float4 positionCS = TransformWorldToHClip(positionWS);
 
-	output.screenPos = ComputeScreenPos(output.positionCS);
+	output.positionCS = positionCS;
+
+    float4 ndc = positionCS * 0.5f;
+    ndc.xy = float2(ndc.x, ndc.y * _ProjectionParams.x) + ndc.w;
+    ndc.zw = positionCS.zw;
+	output.positionNDC = ndc; 
 	
 	output.normalWS = float4(normalInput.normalWS, positionWS.x);
 	output.tangent = float4(normalInput.tangentWS, positionWS.y);

Packages/zzwater/shaders/ocean.shader

@@ -5,6 +5,12 @@ Shader "zzwater/ocean"
 		_Direction("Animation direction", Vector) = (0,-1,0,0)
 		_Speed("Animation Speed", Float) = 1
 
+        //Color + Transparency
+		[HDR]_BaseColor("Deep", Color) = (0, 0.44, 0.62, 1)
+		[HDR]_ShallowColor("Shallow", Color) = (0.1, 0.9, 0.89, 0.02)
+		_DepthVertical("View Depth", Range(0.01 , 16)) = 4
+		_DepthHorizontal("Vertical Height Depth", Range(0.01 , 8)) = 1
+
         //waves
 		_WaveSpeed("Speed", Float) = 2
 		_WaveHeight("Height", Range(0 , 10)) = 0.25