Prototype for distorstion

ScriptableRenderPipeline/HDRenderPipeline/Editor/HDAssetFactory.cs

             instance.gaussianPyramidCS = Load<ComputeShader>(PostProcessingPath + "Shaders/Builtins/GaussianDownsample.compute");
             instance.depthPyramidCS = Load<ComputeShader>(HDRenderPipelinePath + "RenderPipelineResources/DepthDownsample.compute");
             instance.copyChannelCS = Load<ComputeShader>(CorePath + "Resources/GPUCopy.compute");
+            instance.applyDistortionCS = Load<ComputeShader>(HDRenderPipelinePath + "RenderPipelineResources/ApplyDistorsion.compute");
 
             instance.clearDispatchIndirectShader = Load<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/cleardispatchindirect.compute");
             instance.buildDispatchIndirectShader = Load<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/builddispatchindirect.compute");

ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs

                 autoGenerateMips = false
             };
 
-            m_DistortionBuffer = HDShaderIDs._DistortionTexture;
-            m_DistortionBufferRT = new RenderTargetIdentifier(m_DistortionBuffer);
-
             m_DeferredShadowBuffer = HDShaderIDs._DeferredShadowTexture;
             m_DeferredShadowBufferRT = new RenderTargetIdentifier(m_DeferredShadowBuffer);
 
                     // Instead we chose to apply distortion at the end after we cumulate distortion vector and desired blurriness. This
                     RenderDistortion(m_CullResults, camera, renderContext, cmd);
 
+                    RenderGaussianPyramidColor(camera, cmd);
+                    ApplyDistortion(cmd, m_Asset.renderPipelineResources);
+
                     RenderPostProcesses(camera, cmd, postProcessLayer);
                 }
             }
                 renderContext.DrawRenderers(cull.visibleRenderers, ref drawSettings, filterSettings, stateBlock.Value);
         }
 
+        void ApplyDistortion(CommandBuffer cmd, RenderPipelineResources resources)
+        {
+            using (new ProfilingSample(cmd, "ApplyDistortion"))
+            {
+                var size = new Vector4(m_CurrentWidth, m_CurrentHeight, 1f / m_CurrentWidth, 1f / m_CurrentHeight);
+                uint x, y, z;
+                resources.applyDistortionCS.GetKernelThreadGroupSizes(resources.applyDistortionKernel, out x, out y, out z);
+                cmd.SetComputeTextureParam(resources.applyDistortionCS, resources.applyDistortionKernel, HDShaderIDs._DistortionTexture, m_DistortionBufferRT);
+                cmd.SetComputeTextureParam(resources.applyDistortionCS, resources.applyDistortionKernel, HDShaderIDs._GaussianPyramidColorTexture, m_GaussianPyramidColorBufferRT);
+                cmd.SetComputeTextureParam(resources.applyDistortionCS, resources.applyDistortionKernel, HDShaderIDs._DepthPyramidTexture, m_DepthPyramidBufferRT);
+                cmd.SetComputeTextureParam(resources.applyDistortionCS, resources.applyDistortionKernel, HDShaderIDs._CameraColorTexture, m_CameraColorBufferRT);
+                cmd.SetComputeVectorParam(resources.applyDistortionCS, HDShaderIDs._Size, size);
+                cmd.SetComputeVectorParam(resources.applyDistortionCS, HDShaderIDs._ZBufferParams, Shader.GetGlobalVector(HDShaderIDs._ZBufferParams));
+                cmd.SetComputeVectorParam(resources.applyDistortionCS, HDShaderIDs._GaussianPyramidColorMipSize, Shader.GetGlobalVector(HDShaderIDs._GaussianPyramidColorMipSize));
+                cmd.DispatchCompute(resources.applyDistortionCS, resources.applyDistortionKernel, (int)(size.x) / (int)x, (int)(size.y) / (int)y, 1);
+            }
+        }
+
         // RenderDepthPrepass render both opaque and opaque alpha tested based on engine configuration.
         // Forward only renderer: We always render everything
         // Deferred renderer: We render a depth prepass only if engine request it. We can decide if we render everything or only opaque alpha tested object.
             {
                 int w = camera.pixelWidth;
                 int h = camera.pixelHeight;
-                int size = Mathf.ClosestPowerOfTwo(Mathf.Min(w, h));
+                int size = CalculatePyramidSize(w, h);
 
                 // The gaussian pyramid compute works in blocks of 8x8 so make sure the last lod has a
                 // minimum size of 8x8
             {
                 int w = camera.pixelWidth;
                 int h = camera.pixelHeight;
-                int size = Mathf.ClosestPowerOfTwo(Mathf.Min(w, h));
+                int size = CalculatePyramidSize(w, h);
 
                 // The gaussian pyramid compute works in blocks of 8x8 so make sure the last lod has a
                 // minimum size of 8x8
 
                 cmd.GetTemporaryRT(m_DistortionBuffer, w, h, 0, FilterMode.Point, Builtin.GetDistortionBufferFormat(), Builtin.GetDistortionBufferReadWrite());
                 cmd.SetRenderTarget(m_DistortionBufferRT, m_CameraDepthStencilBufferRT);
-                cmd.ClearRenderTarget(false, true, Color.black); // TODO: can we avoid this clear for performance ?
+                cmd.ClearRenderTarget(false, true, Color.clear); // TODO: can we avoid this clear for performance ?
 
                 // Only transparent object can render distortion vectors
                 RenderTransparentRenderList(cullResults, camera, renderContext, cmd, HDShaderPassNames.s_DistortionVectorsName);
                     cmd.GetTemporaryRT(m_CameraFilteringBuffer,          w, h, 0, FilterMode.Point, RenderTextureFormat.RGB111110Float, RenderTextureReadWrite.Linear, 1, true); // Enable UAV
 
                     // Color and depth pyramids
-                    int s = Mathf.ClosestPowerOfTwo(Mathf.Min(w, h));
+                    int s = CalculatePyramidSize(w, h);
                     m_GaussianPyramidColorBufferDesc.width = s;
                     m_GaussianPyramidColorBufferDesc.height = s;
                     cmd.GetTemporaryRT(m_GaussianPyramidColorBuffer, m_GaussianPyramidColorBufferDesc, FilterMode.Trilinear);
                 }
                 // END TEMP
             }
+        }
+
+        static int CalculatePyramidSize(int w, int h)
+        {
+            return Mathf.ClosestPowerOfTwo(Mathf.Min(w, h));
         }
     }
 }

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

             Name "Distortion" // Name is not used
             Tags { "LightMode" = "DistortionVectors" } // This will be only for transparent object based on the RenderQueue index
 
-            Blend One One
+            Blend One One, One One
+            BlendOp Add, Max
             ZTest [_ZTestMode]
             ZWrite off
             Cull [_CullMode]

ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/Editor/BaseUnlitUI.cs

             public static GUIContent distortionEnableText = new GUIContent("Distortion", "Enable distortion on this shader");
             public static GUIContent distortionOnlyText = new GUIContent("Distortion Only", "This shader will only be use to render distortion");
             public static GUIContent distortionDepthTestText = new GUIContent("Distortion Depth Test", "Enable the depth test for distortion");
+            public static GUIContent distortionVectorMapText = new GUIContent("Distortion Vector Map", "Vector Map for the distorsion");
 
             public static string advancedText = "Advanced Options";
         }
         protected const string kDistortionOnly = "_DistortionOnly";
         protected MaterialProperty distortionDepthTest = null;
         protected const string kDistortionDepthTest = "_DistortionDepthTest";
+        protected MaterialProperty distortionVectorMap = null;
+        protected const string kDistortionVectorMap = "_DistortionVectorMap";
 
         // See comment in LitProperties.hlsl
         const string kEmissionColor = "_EmissionColor";
             distortionEnable = FindProperty(kDistortionEnable, props, false);
             distortionOnly = FindProperty(kDistortionOnly, props, false);
             distortionDepthTest = FindProperty(kDistortionDepthTest, props, false);
+            distortionVectorMap = FindProperty(kDistortionVectorMap, props, false);
         }
 
         void SurfaceTypePopup()
                     if (distortionEnable.floatValue == 1.0f)
                     {
                         EditorGUI.indentLevel++;
+                        m_MaterialEditor.TexturePropertySingleLine(StylesBaseUnlit.distortionVectorMapText, distortionVectorMap);
                         m_MaterialEditor.ShaderProperty(distortionOnly, StylesBaseUnlit.distortionOnlyText);
                         m_MaterialEditor.ShaderProperty(distortionDepthTest, StylesBaseUnlit.distortionDepthTestText);
                         EditorGUI.indentLevel--;

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/HDRenderPipelineResources.asset

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   depthPyramidCS: {fileID: 7200000, guid: 64a553bb564274041906f78ffba955e4, type: 3}
   copyChannelCS: {fileID: 7200000, guid: a68d8aaeb0956234d94e389f196381ee, type: 3}
+  applyDistortionCS: {fileID: 7200000, guid: 2fa6c0e3fe6dc3145a4156f21913fe5c, type: 3}
   clearDispatchIndirectShader: {fileID: 7200000, guid: fc1f553acb80a6446a32d33e403d0656,
     type: 3}
   buildDispatchIndirectShader: {fileID: 7200000, guid: 4eb1b418be7044c40bb5200496c50f14,

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/HDRenderPipelineResources.asset.meta

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ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/RenderPipelineResources.cs

         public ComputeShader gaussianPyramidCS;
         public ComputeShader depthPyramidCS;
         public ComputeShader copyChannelCS;
+        public ComputeShader applyDistortionCS;
 
         // Lighting tile pass resources
         public ComputeShader clearDispatchIndirectShader;
         public Shader GGXConvolve;
 
         public Shader skyboxCubemap;
+
+        public int applyDistortionKernel { get; private set; }
+
+        void OnEnable()
+        {
+            applyDistortionKernel = -1;
+
+            if (applyDistortionCS != null)
+                applyDistortionKernel = applyDistortionCS.FindKernel("KMain");
+        }
     }
 }

SampleScenes/HDTest/DistortionTest.unity.meta

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SampleScenes/HDTest/GraphicTest/Common/Material/Mat_Distorsion_Ripple.mat

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SampleScenes/HDTest/GraphicTest/Common/Material/Mat_Distorsion_Ripple.mat.meta

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ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/ApplyDistorsion.compute

+#include "../../Core/ShaderLibrary/Common.hlsl"
+#include "../Material/Builtin/BuiltinData.hlsl"
+
+Texture2D<float4> _DistortionTexture;
+Texture2D<float> _PyramidDepthTexture;
+Texture2D<float4> _GaussianPyramidColorTexture;
+RWTexture2D<float4> _CameraColorTexture;
+
+SamplerState sampler_GaussianPyramidColorTexture;
+SamplerState sampler_PyramidDepthTexture;
+
+CBUFFER_START(cb)
+    float4 _Size;
+    float4 _GaussianPyramidColorMipSize;
+CBUFFER_END
+
+#pragma kernel KMain
+[numthreads(8, 8, 1)]
+void KMain(uint2 groupId : SV_GroupID, uint2 groupThreadId : SV_GroupThreadID, uint2 dispatchThreadId : SV_DispatchThreadID)
+{
+    float4 encodedDistorsion = _DistortionTexture.Load(int3(dispatchThreadId, 0));
+    float2 distorsion;
+    float2 distorsionBlur;
+    DecodeDistortion(encodedDistorsion, distorsion, distorsionBlur);
+
+    float2 distordedUV = (float2(dispatchThreadId) + distorsion) * _Size.zw;
+    float mip = (_GaussianPyramidColorMipSize.w - 1) * clamp(distorsionBlur.x, 0.0, 1.0);
+    float4 sampled = _GaussianPyramidColorTexture.SampleLevel(sampler_GaussianPyramidColorTexture, distordedUV, mip);
+
+    float2 uv = float2(dispatchThreadId) * _Size.zw;
+    float depth = _PyramidDepthTexture.SampleLevel(sampler_PyramidDepthTexture, uv, 0).r;
+    float distordedDepth = _PyramidDepthTexture.SampleLevel(sampler_PyramidDepthTexture, distordedUV, 0).r;
+
+    if (depth < distordedDepth)
+        _CameraColorTexture[dispatchThreadId] = sampled;
+}

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/ApplyDistorsion.compute.meta

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SampleScenes/HDTest/GraphicTest/Common/CustomTexture/DistortionMap.shader

+Shader "Hidden/HDRenderPipeline/Test/DistortionMap"{
+    Properties
+    {
+        _Size("Size", Float) = 1
+        _DistortionAmplitude("Distortion Amplitude", Float) = 1
+        _BlurMinAmplitude("Blur Min Amplitude", Range(0, 1)) = 0
+        _BlurMaxAmplitude("Blur Max Amplitude", Range(0, 1)) = 1
+        _NoiseAmplitude("Noise Amplitude", Range(0, 1)) = 0.5
+        _NoiseLacunarity("Noise Lacunarity", Range(0, 10)) = 2
+    }
+
+    CGINCLUDE
+
+    const float Pi = 3.14159265359;
+
+    float _Size;
+    float _DistortionAmplitude;
+    float _BlurMinAmplitude;
+    float _BlurMaxAmplitude;
+    float _NoiseAmplitude;
+    float _NoiseLacunarity;
+
+    float rand(float v)
+    {
+        return frac(sin(v) * 1634242.2341);
+    }
+
+    float rand(float2 v, float2 o)
+    {
+        return rand(dot(v, o));
+    }
+
+    float noise(float2 v, float2 o)
+    {
+        float2 p = v;
+        float2 i = floor(p);
+        float2 f = frac(v);
+        float2 u = f*f*(3.0 - 2.0*f);
+
+        float f00 = rand(i, o);
+        float f01 = rand(i + float2(0.0, 1.0), o);
+        float f11 = rand(i + float2(1.0, 1.0), o);
+        float f10 = rand(i + float2(1.0, 0.0), o);
+
+        return lerp(f00, f10, u.x) +
+            (f01 - f00)* u.y * (1.0 - u.x) +
+            (f11 - f10) * u.x * u.y;
+    }
+
+    float3 noise3(float2 v)
+    {
+        const float2 _O1 = float2(0.734523, 0.235214);
+        const float2 _O2 = float2(0.142378, 0.781423);
+        const float2 _O3 = float2(0.891253, 0.534342);
+
+        return float3(noise(v, _O1), noise(v, _O2), noise(v, _O3));
+    }
+
+    float3 fbm(float2 v, float a, float f)
+    {
+        float3 r = float3(0.0, 0.0, 0.0);
+
+        for (int i = 0; i < 6 ; ++i)
+        {
+            r += a * noise3(v);
+            v *= f;
+            a *= a;
+        }
+
+        return r;
+    }
+
+    float3 turb(float2 v, float a, float f)
+    {
+        float3 r = float3(0.0, 0.0, 0.0);
+
+        for (int i = 0; i < 6; ++i)
+        {
+            r += a * abs(noise3(v));
+            v *= f;
+            a *= a;
+        }
+
+        return r;
+    }
+
+    float3 ridge(float2 v, float a, float f, float3 n)
+    {
+        float3 r = float3(0.0, 0.0, 0.0);
+
+        for (int i = 0; i < 6; ++i)
+        {
+            float3 t = n - abs(a * noise3(v));
+            t *= t;
+            r += t;
+
+            v *= f;
+            a *= a;
+        }
+
+        return r;
+    }
+    ENDCG
+
+    SubShader
+    {
+        Lighting Off
+        Blend One Zero
+
+        Pass
+        {
+            Name "2DNoise"
+
+            CGPROGRAM
+            #include "UnityCustomRenderTexture.cginc"
+            #pragma vertex CustomRenderTextureVertexShader
+            #pragma fragment frag
+            #pragma target 3.0
+
+            float4 frag(v2f_customrendertexture IN) : COLOR
+            {
+                float2 p = _Size * IN.globalTexcoord.xy;
+                float3 s = fbm(p, _NoiseAmplitude, _NoiseLacunarity * (_SinTime.w * 0.1 + 1.0));
+
+                float2 distortion = s.xy * _DistortionAmplitude;
+                float blur = s.z * (_BlurMaxAmplitude - _BlurMinAmplitude) + _BlurMinAmplitude;
+
+                return float4(distortion, blur, 1.0);
+            }
+            ENDCG
+        }
+
+        
+
+        Pass
+        {
+            Name "Ripple"
+
+            CGPROGRAM
+            #include "UnityCustomRenderTexture.cginc"
+            #pragma vertex CustomRenderTextureVertexShader
+            #pragma fragment frag
+            #pragma target 3.0
+
+            float4 frag(v2f_customrendertexture IN) : COLOR
+            {
+                float s = _Size * (cos(_Time.w) * 0.1 + 1);
+
+                float2 distortion = float2(sin(IN.globalTexcoord.y * s) * _DistortionAmplitude, 0);
+
+                float blur = 0;
+
+                return float4(distortion, blur, 1.0);
+            }
+            ENDCG
+        }
+    }
+}

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SampleScenes/HDTest/GraphicTest/Common/CustomTexture/Mat_DistortionMap_Ripple.mat.meta

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