Merge pull request #476 from Unity-Technologies/Unity-2017.3

Merge 2017.3

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

   m_PrefabInternal: {fileID: 0}
   m_Name: Lit_Checker_White
   m_Shader: {fileID: 4800000, guid: 6e4ae4064600d784cac1e41a9e6f2e59, type: 3}
-  m_ShaderKeywords: _NORMALMAP_TANGENT_SPACE
+  m_ShaderKeywords: _DOUBLESIDEDENABLE_OFF _NORMALMAP_TANGENT_SPACE
   m_LightmapFlags: 1
   m_EnableInstancingVariants: 0
   m_DoubleSidedGI: 0
     - _DetailNormalMapScale: 1
     - _DetailNormalScale: 1
     - _DetailSmoothnessScale: 1
+    - _DistortionBlendMode: 0
+    - _DistortionBlurBlendMode: 0
+    - _DistortionBlurDstBlend: 1
+    - _DistortionBlurRemapMax: 1
+    - _DistortionBlurRemapMin: 0
+    - _DistortionBlurScale: 1
+    - _DistortionBlurSrcBlend: 1
+    - _DistortionDstBlend: 1
+    - _DistortionScale: 1
+    - _DistortionSrcBlend: 1
-    - _DoubleSidedNormalMode: 1
+    - _DoubleSidedNormalMode: 2
     - _Drag: 1
     - _DstBlend: 0
     - _EmissiveColorMode: 1
+    - _EnableVertexDisplacement: 0
     - _EnableWind: 0
     - _GlossMapScale: 1
     - _Glossiness: 0.5
     - _PPDMaxSamples: 15
     - _PPDMinSamples: 5
     - _Parallax: 0.02
+    - _PerPixelDisplacementObjectScale: 1
+    - _RefractionMode: 0
     - _RoughRefractionEnable: 0
     - _ShiverDirectionality: 0.5
     - _ShiverDrag: 0.2
     - _UVDetail: 0
     - _UVMappingPlanar: 0
     - _UVSec: 0
+    - _VertexDisplacementObjectScale: 1
+    - _VertexDisplacementTilingScale: 1
-    - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
+    - _DoubleSidedConstants: {r: -1, g: -1, b: -1, a: 0}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
     - _EmissiveColor: {r: 0, g: 0, b: 0, a: 1}
     - _SpecularColor: {r: 1, g: 1, b: 1, a: 1}

ScriptableRenderPipeline/Core/ShaderLibrary/BSDF.hlsl

 }
 
 // Ref: Diffuse Lighting for GGX + Smith Microsurfaces, p. 113.
-float3 DiffuseGGXNoPI(float3 albedo, float NdotV, float NdotL, float NdotH, float LdotV, float perceptualRoughness)
+float3 DiffuseGGXNoPI(float3 albedo, float NdotV, float NdotL, float NdotH, float LdotV, float roughness)
-    float facing    = 0.5 + 0.5 * LdotV;                        // (LdotH)^2
-    float rough     = facing * (0.9 - 0.4 * facing) * ((0.5 + NdotH) / NdotH);
+    float facing    = 0.5 + 0.5 * LdotV;              // (LdotH)^2
+    float rough     = facing * (0.9 - 0.4 * facing) * (0.5 / NdotH + 1);
-    float smooth    = transmitL * transmitV * 1.05;             // Normalize F_t over the hemisphere
-    float single    = lerp(smooth, rough, perceptualRoughness); // Rescaled by PI
-    // This constant is picked s.t. setting perceptualRoughness, albedo and all cosines to 1
-    // allows us to match the Lambertian and the Disney Diffuse models. Original value: 0.1159.
-    float multiple  = perceptualRoughness * (0.079577 * PI);    // Rescaled by PI
+    float smooth    = transmitL * transmitV * 1.05;   // Normalize F_t over the hemisphere
+    float single    = lerp(smooth, rough, roughness); // Rescaled by PI
+    float multiple  = roughness * (0.1159 * PI);      // Rescaled by PI
-float3 DiffuseGGX(float3 albedo, float NdotV, float NdotL, float NdotH, float LdotV, float perceptualRoughness)
+float3 DiffuseGGX(float3 albedo, float NdotV, float NdotL, float NdotH, float LdotV, float roughness)
-    return INV_PI * DiffuseGGXNoPI(albedo, NdotV, NdotL, NdotH, LdotV, perceptualRoughness);
+    return INV_PI * DiffuseGGXNoPI(albedo, NdotV, NdotL, NdotH, LdotV, roughness);
 }
 
 #endif // UNITY_BSDF_INCLUDED

ScriptableRenderPipeline/Core/ShaderLibrary/ImageBasedLighting.hlsl

 // approximating the cone of the specular lobe, and then computing the MIP map level
 // which (approximately) covers the footprint of the lobe with a single texel.
 // Improves the perceptual roughness distribution.
-float PerceptualRoughnessToMipmapLevel(float perceptualRoughness)
+float PerceptualRoughnessToMipmapLevel(float perceptualRoughness, uint mipMapCount)
-    return perceptualRoughness * UNITY_SPECCUBE_LOD_STEPS;
+    return perceptualRoughness * mipMapCount;
+}
+
+float PerceptualRoughnessToMipmapLevel(float perceptualRoughness)
+{
+    return PerceptualRoughnessToMipmapLevel(perceptualRoughness, UNITY_SPECCUBE_LOD_STEPS);
 }
 
 // The *accurate* version of the non-linear remapping. It works by

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);
 
                 {
                     RenderVelocity(m_CullResults, hdCamera, renderContext, cmd); // Note we may have to render velocity earlier if we do temporalAO, temporal volumetric etc... Mean we will not take into account forward opaque in case of deferred rendering ?
 
+                    RenderGaussianPyramidColor(camera, cmd);
+
-                    // Instead we chose to apply distortion at the end after we cumulate distortion vector and desired blurriness. This
-                    RenderDistortion(m_CullResults, camera, renderContext, cmd);
+                    // Instead we chose to apply distortion at the end after we cumulate distortion vector and desired blurriness.
+                    AccumulateDistortion(m_CullResults, camera, renderContext, cmd);
+                    RenderDistortion(cmd, m_Asset.renderPipelineResources);
 
                     RenderPostProcesses(camera, cmd, postProcessLayer);
                 }
                 renderContext.DrawRenderers(cull.visibleRenderers, ref drawSettings, filterSettings, stateBlock.Value);
         }
 
+        void AccumulateDistortion(CullResults cullResults, Camera camera, ScriptableRenderContext renderContext, CommandBuffer cmd)
+        {
+            if (!m_CurrentDebugDisplaySettings.renderingDebugSettings.enableDistortion)
+                return;
+
+            using (new ProfilingSample(cmd, "Distortion"))
+            {
+                int w = camera.pixelWidth;
+                int h = camera.pixelHeight;
+
+                cmd.GetTemporaryRT(m_DistortionBuffer, w, h, 0, FilterMode.Point, Builtin.GetDistortionBufferFormat(), Builtin.GetDistortionBufferReadWrite());
+                cmd.SetRenderTarget(m_DistortionBufferRT, m_CameraDepthStencilBufferRT);
+                cmd.ClearRenderTarget(false, true, Color.clear);
+
+                // Only transparent object can render distortion vectors
+                RenderTransparentRenderList(cullResults, camera, renderContext, cmd, HDShaderPassNames.s_DistortionVectorsName);
+            }
+        }
+
+        void RenderDistortion(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._CameraColorTexture, m_CameraColorBufferRT);
+                cmd.SetComputeTextureParam(resources.applyDistortionCS, resources.applyDistortionKernel, HDShaderIDs._DepthTexture, GetDepthTexture());
+                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, Mathf.CeilToInt(size.x / x), Mathf.CeilToInt(size.y / 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
             }
         }
 
-        void RenderDistortion(CullResults cullResults, Camera camera, ScriptableRenderContext renderContext, CommandBuffer cmd)
-        {
-            if (!m_CurrentDebugDisplaySettings.renderingDebugSettings.enableDistortion)
-                return;
-
-            using (new ProfilingSample(cmd, "Distortion"))
-            {
-                int w = camera.pixelWidth;
-                int h = camera.pixelHeight;
-
-                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 ?
-
-                // Only transparent object can render distortion vectors
-                RenderTransparentRenderList(cullResults, camera, renderContext, cmd, HDShaderPassNames.s_DistortionVectorsName);
-            }
-        }
-
         void RenderPostProcesses(Camera camera, CommandBuffer cmd, PostProcessLayer layer)
         {
             using (new ProfilingSample(cmd, "Post-processing"))
                     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/Builtin/BuiltinData.hlsl

     velocity = inBuffer.xy;
 }
 
-void EncodeDistortion(float2 distortion, float distortionBlur, out float4 outBuffer)
+void EncodeDistortion(float2 distortion, float distortionBlur, bool isValidSource, out float4 outBuffer)
-    outBuffer = float4(distortion, 0.0, distortionBlur);
+    outBuffer = float4(distortion, isValidSource, distortionBlur);
-void DecodeDistortion(float4 inBuffer, out float2 distortion, out float2 distortionBlur)
+void DecodeDistortion(float4 inBuffer, out float2 distortion, out float distortionBlur, out bool isValidSource)
+    isValidSource = (inBuffer.z != 0.0);
 }
 
 void GetBuiltinDataDebug(uint paramId, BuiltinData builtinData, inout float3 result, inout bool needLinearToSRGB)

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

         [HideInInspector] _UVDetailsMappingMask2("_UVDetailsMappingMask2", Color) = (1, 0, 0, 0)
         [HideInInspector] _UVDetailsMappingMask3("_UVDetailsMappingMask3", Color) = (1, 0, 0, 0)
 
+        [ToggleOff] _LinkDetailsWithBase0("LinkDetailsWithBase0", Float) = 1.0
+        [ToggleOff] _LinkDetailsWithBase1("LinkDetailsWithBase1", Float) = 1.0
+        [ToggleOff] _LinkDetailsWithBase2("LinkDetailsWithBase2", Float) = 1.0
+        [ToggleOff] _LinkDetailsWithBase3("LinkDetailsWithBase3", Float) = 1.0
+
         [HideInInspector] _ShowMaterialReferences("_ShowMaterialReferences", Float) = 0
         [HideInInspector] _ShowLayer0("_ShowLayer0", Float) = 0
         [HideInInspector] _ShowLayer1("_ShowLayer1", Float) = 0

ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitTessellation.shader

         [HideInInspector] _UVDetailsMappingMask2("_UVDetailsMappingMask2", Color) = (1, 0, 0, 0)
         [HideInInspector] _UVDetailsMappingMask3("_UVDetailsMappingMask3", Color) = (1, 0, 0, 0)
 
+        [ToggleOff] _LinkDetailsWithBase0("LinkDetailsWithBase0", Float) = 1.0
+        [ToggleOff] _LinkDetailsWithBase1("LinkDetailsWithBase1", Float) = 1.0
+        [ToggleOff] _LinkDetailsWithBase2("LinkDetailsWithBase2", Float) = 1.0
+        [ToggleOff] _LinkDetailsWithBase3("LinkDetailsWithBase3", Float) = 1.0
+
         [HideInInspector] _ShowMaterialReferences("_ShowMaterialReferences", Float) = 0
         [HideInInspector] _ShowLayer0("_ShowLayer0", Float) = 0
         [HideInInspector] _ShowLayer1("_ShowLayer1", Float) = 0

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Editor/LitUI.cs

             public static GUIContent normalMapSpaceWarning = new GUIContent("Object space normal can't be use with triplanar mapping.");
 
             // Transparency
-            public static string TransparencyInputsText = "Transparency Inputs";
             public static string refractionModeText = "Refraction Mode";
             public static GUIContent refractionIORText = new GUIContent("Indice of refraction", "Indice of refraction");
             public static GUIContent refractionThicknessText = new GUIContent("Refraction Thickness", "Thickness for rough refraction");
                 && refractionMode != null)
             {
                 EditorGUILayout.Space();
-                EditorGUILayout.LabelField(Styles.TransparencyInputsText, EditorStyles.boldLabel);
+                EditorGUILayout.LabelField(StylesBaseUnlit.TransparencyInputsText, EditorStyles.boldLabel);
-                m_MaterialEditor.ShaderProperty(refractionMode, Styles.refractionModeText);
-                var mode = (Lit.RefractionMode)refractionMode.floatValue;
-                if (mode != Lit.RefractionMode.None)
+                if (refractionMode != null)
-                    m_MaterialEditor.ShaderProperty(ior, Styles.refractionIORText);
+                    m_MaterialEditor.ShaderProperty(refractionMode, Styles.refractionModeText);
+                    var mode = (Lit.RefractionMode)refractionMode.floatValue;
+                    if (mode != Lit.RefractionMode.None)
+                    {
+                        ++EditorGUI.indentLevel;
-                    if (mode != Lit.RefractionMode.ThinPlane)
-                    {
-                        if (thicknessMap.textureValue == null)
-                            m_MaterialEditor.ShaderProperty(thickness, Styles.refractionThicknessText);
-                        m_MaterialEditor.TexturePropertySingleLine(Styles.refractionThicknessMapText, thicknessMap);
+                        m_MaterialEditor.ShaderProperty(ior, Styles.refractionIORText);
+                        if (mode != Lit.RefractionMode.ThinPlane)
+                        {
+                            if (thicknessMap.textureValue == null)
+                                m_MaterialEditor.ShaderProperty(thickness, Styles.refractionThicknessText);
+                            m_MaterialEditor.TexturePropertySingleLine(Styles.refractionThicknessMapText, thicknessMap);
+
+                            ++EditorGUI.indentLevel;
+                            m_MaterialEditor.ShaderProperty(thicknessMultiplier, Styles.refractionThicknessMultiplierText);
+                            --EditorGUI.indentLevel;
+                        }
+
+                        m_MaterialEditor.ShaderProperty(transmittanceColor, Styles.transmittanceColorText);
-                        m_MaterialEditor.ShaderProperty(thicknessMultiplier, Styles.refractionThicknessMultiplierText);
+                        m_MaterialEditor.ShaderProperty(atDistance, Styles.atDistanceText);
+                        --EditorGUI.indentLevel;
+
-
-                    m_MaterialEditor.ShaderProperty(transmittanceColor, Styles.transmittanceColorText);
-                    ++EditorGUI.indentLevel;
-                    m_MaterialEditor.ShaderProperty(atDistance, Styles.atDistanceText);
-                    --EditorGUI.indentLevel;
+
+                DoDistortionInputsGUI();
+
                 --EditorGUI.indentLevel;
             }
         }

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

 // Color pyramid (width, height, lodcount, Unused)
 float4 _GaussianPyramidColorMipSize;
 TEXTURE2D(_GaussianPyramidColorTexture);
-SAMPLER2D(sampler_GaussianPyramidColorTexture);
-SAMPLER2D(sampler_PyramidDepthTexture);
+SamplerState ltc_trilinear_clamp_sampler;
 // TODO: This one should be set into a constant Buffer at pass frequency (with _Screensize)
 TEXTURE2D(_PreIntegratedFGD);
 TEXTURE2D_ARRAY(_LtcData); // We pack the 3 Ltc data inside a texture array
 #ifdef LIT_DIFFUSE_LAMBERT_BRDF
     float  diffuseTerm = Lambert();
 #elif LIT_DIFFUSE_GGX_BRDF
-    float3 diffuseTerm = DiffuseGGX(bsdfData.diffuseColor, NdotV, NdotL, NdotH, LdotV, bsdfData.perceptualRoughness);
+    float3 diffuseTerm = DiffuseGGX(bsdfData.diffuseColor, NdotV, NdotL, NdotH, LdotV, bsdfData.roughness);
 #else
     float  diffuseTerm = DisneyDiffuse(NdotV, NdotL, LdotV, bsdfData.perceptualRoughness);
 #endif
     float3 refractedBackPointWS = float3(0.0, 0.0, 0.0);
     float opticalDepth = 0.0;
 
+    uint2 depthSize = uint2(_PyramidDepthMipSize.xy);
+
     // For all refraction approximation, to calculate the refracted point in world space,
     //   we approximate the scene as a plane (back plane) with normal -V at the depth hit point.
     //   (We avoid to raymarch the depth texture to get the refracted point.)
     float3 R = refract(-V, bsdfData.normalWS, 1.0 / bsdfData.ior);
 
     // Get the depth of the approximated back plane
-    float pyramidDepth = SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, posInput.positionSS, 2.0).r;
+    float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
     float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
 
     // Distance from point to the back plane
     //  So the light is refracted twice: in and out of the tangent sphere
 
     // Get the depth of the approximated back plane
-    float pyramidDepth = SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, posInput.positionSS, 2.0).r;
+    float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
     float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
 
     // Distance from point to the back plane
     float3 R = refract(-V, bsdfData.normalWS, 1.0 / bsdfData.ior);
 
     // Get the depth of the approximated back plane
-    float pyramidDepth = SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, posInput.positionSS, 2.0).r;
+    float pyramidDepth = LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, posInput.positionSS * (depthSize >> 2), 2).r;
     float depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
 
     // Distance from point to the back plane
     // Calculate screen space coordinates of refracted point in back plane
     float4 refractedBackPointCS = mul(_ViewProjMatrix, float4(refractedBackPointWS, 1.0));
     float2 refractedBackPointSS = ComputeScreenSpacePosition(refractedBackPointCS);
-    float refractedBackPointDepth = LinearEyeDepth(SAMPLE_TEXTURE2D_LOD(_PyramidDepthTexture, sampler_PyramidDepthTexture, refractedBackPointSS, 0.0).r, _ZBufferParams);
+    float refractedBackPointDepth = LinearEyeDepth(LOAD_TEXTURE2D_LOD(_PyramidDepthTexture, refractedBackPointSS * depthSize, 0).r, _ZBufferParams);
 
     // Exit if texel is out of color buffer
     // Or if the texel is from an object in front of the object
     {
-        diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, posInput.positionSS, 0.0).rgb;
+        diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, ltc_trilinear_clamp_sampler, posInput.positionSS, 0.0).rgb;
-    float mipLevel = PerceptualRoughnessToMipmapLevel(bsdfData.perceptualRoughness);
-    diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, refractedBackPointSS.xy, mipLevel).rgb;
+    float mipLevel = PerceptualRoughnessToMipmapLevel(bsdfData.perceptualRoughness, uint(_GaussianPyramidColorMipSize.z));
+    diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, ltc_trilinear_clamp_sampler, refractedBackPointSS, mipLevel).rgb;
 
     // Beer-Lamber law for absorption
     float3 transmittance = exp(-bsdfData.absorptionCoefficient * opticalDepth);
     // Use perfect flat transparency when we cannot fetch the correct pixel color for the refracted point
-    diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, posInput.positionSS, 0.0).rgb;
+    diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, ltc_trilinear_clamp_sampler, posInput.positionSS, 0.0).rgb;
 #endif
 }
 

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         [ToggleOff] _DistortionOnly("Distortion Only", Float) = 0.0
         [ToggleOff] _DistortionDepthTest("Distortion Depth Test Enable", Float) = 0.0
         [ToggleOff] _DepthOffsetEnable("Depth Offset View space", Float) = 0.0
+        [Enum(Add, 0, Multiply, 1)] _DistortionBlendMode("Distortion Blend Mode", Int) = 0
+        [HideInInspector] _DistortionSrcBlend("Distortion Blend Src", Int) = 0
+        [HideInInspector] _DistortionDstBlend("Distortion Blend Dst", Int) = 0
+        [HideInInspector] _DistortionBlurSrcBlend("Distortion Blur Blend Src", Int) = 0
+        [HideInInspector] _DistortionBlurDstBlend("Distortion Blur Blend Dst", Int) = 0
+        [HideInInspector] _DistortionBlurBlendMode("Distortion Blur Blend Mode", Int) = 0
+        _DistortionScale("Distortion Scale", Float) = 1
+        _DistortionBlurScale("Distortion Blur Scale", Float) = 1
+        _DistortionBlurRemapMin("DistortionBlurRemapMin", Float) = 0.0
+        _DistortionBlurRemapMax("DistortionBlurRemapMax", Float) = 1.0
 
         [ToggleOff]  _AlphaCutoffEnable("Alpha Cutoff Enable", Float) = 0.0
         _AlphaCutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
             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 [_DistortionSrcBlend] [_DistortionDstBlend], [_DistortionBlurSrcBlend] [_DistortionBlurDstBlend]
+            BlendOp Add, [_DistortionBlurBlendOp]
             ZTest [_ZTestMode]
             ZWrite off
             Cull [_CullMode]

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

 
 #if (SHADERPASS == SHADERPASS_DISTORTION)
     float3 distortion = SAMPLE_TEXTURE2D(_DistortionVectorMap, sampler_DistortionVectorMap, input.texCoord0).rgb;
-    builtinData.distortion = distortion.rg;
-    builtinData.distortionBlur = distortion.b;
+    builtinData.distortion = distortion.rg * _DistortionScale;
+    builtinData.distortionBlur = clamp(distortion.b * _DistortionBlurScale, 0.0, 1.0) * (_DistortionBlurRemapMax - _DistortionBlurRemapMin) + _DistortionBlurRemapMin;
 #else
     builtinData.distortion = float2(0.0, 0.0);
     builtinData.distortionBlur = 0.0;

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitDataInternal.hlsl

     surfaceData.baseColor = SAMPLE_UVMAPPING_TEXTURE2D(ADD_IDX(_BaseColorMap), ADD_ZERO_IDX(sampler_BaseColorMap), ADD_IDX(layerTexCoord.base)).rgb * ADD_IDX(_BaseColor).rgb;
 #ifdef _DETAIL_MAP_IDX
     // Use overlay blend mode for detail abledo: (base < 0.5 ? (2.0 * base * blend) : (1.0 - 2.0 * (1.0 - base) * (1.0 - blend)))
-    float baseColorOverlay = (detailAlbedo < 0.5) ? 
+    float3 baseColorOverlay = (detailAlbedo < 0.5) ? 
                                 surfaceData.baseColor * PositivePow(2.0 * detailAlbedo, ADD_IDX(_DetailAlbedoScale)) :
                                 1.0 - 2.0 * (1.0 - surfaceData.baseColor) * (1.0 - (detailAlbedo * ADD_IDX(_DetailAlbedoScale)));
     // Lerp with details mask

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitProperties.hlsl

 // shared constant between lit and layered lit
 float _AlphaCutoff;
 float4 _DoubleSidedConstants;
+float _DistortionScale;
+float _DistortionBlurScale;
+float _DistortionBlurRemapMin;
+float _DistortionBlurRemapMax;
 
 float _PPDMaxSamples;
 float _PPDMinSamples;

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

 using System;
 using UnityEngine;
 using UnityEngine.Experimental.Rendering.HDPipeline;
+using UnityEngine.Rendering;
 
 namespace UnityEditor.Experimental.Rendering.HDPipeline
 {
     {
         protected static class StylesBaseUnlit
         {
+            public static string TransparencyInputsText = "Transparency Inputs";
             public static string optionText = "Surface options";
             public static string surfaceTypeText = "Surface Type";
             public static string blendModeText = "Blend Mode";
             public static GUIContent transparentDepthPrepassEnableText = new GUIContent("Enable transparent depth prepass", "It allow to ");	
 
             public static GUIContent doubleSidedEnableText = new GUIContent("Double Sided", "This will render the two face of the objects (disable backface culling) and flip/mirror normal");
-            public static GUIContent distortionEnableText = new GUIContent("Distortion", "Enable distortion on this shader");
+            public static GUIContent distortionEnableText = new GUIContent("Distortion", "Enable distortion on this shader"); 
+            public static GUIContent distortionVectorMapText = new GUIContent("Distortion Vector Map - Dist(RG) Blur(B)", "Vector Map for the distorsion - Dist(RG) Blur(B)"); 
+            public static GUIContent distortionBlendModeText = new GUIContent("Distortion Blend Mode", "Distortion Blend Mode"); 
+            public static GUIContent distortionScaleText = new GUIContent("Distortion Scale", "Distortion Scale");
+            public static GUIContent distortionBlurScaleText = new GUIContent("Distortion Blur Scale", "Distortion Blur Scale");
+            public static GUIContent distortionBlurRemappingText = new GUIContent("Distortion Blur Remapping", "Distortion Blur Remapping");
 
             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";
+        protected MaterialProperty distortionBlendMode = null;
+        protected const string kDistortionBlendMode = "_DistortionBlendMode";
+        protected MaterialProperty distortionScale = null;
+        protected const string kDistortionScale = "_DistortionScale";
+        protected MaterialProperty distortionBlurScale = null;
+        protected const string kDistortionBlurScale = "_DistortionBlurScale";
+        protected MaterialProperty distortionBlurRemapMin = null;
+        protected const string kDistortionBlurRemapMin = "_DistortionBlurRemapMin";
+        protected MaterialProperty distortionBlurRemapMax = null;
+        protected const string kDistortionBlurRemapMax = "_DistortionBlurRemapMax";
 
         // 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);
+            distortionBlendMode = FindProperty(kDistortionBlendMode, props, false);
+            distortionScale = FindProperty(kDistortionScale, props, false);
+            distortionBlurScale = FindProperty(kDistortionBlurScale, props, false);
+            distortionBlurRemapMin = FindProperty(kDistortionBlurRemapMin, props, false);
+            distortionBlurRemapMax = FindProperty(kDistortionBlurRemapMax, props, false);
         }
 
         void SurfaceTypePopup()
             if ((SurfaceType)surfaceType.floatValue == SurfaceType.Transparent)
             {
                 BlendModePopup();
-
-                if (distortionEnable != null)
-                {
-                    m_MaterialEditor.ShaderProperty(distortionEnable, StylesBaseUnlit.distortionEnableText);
-
-                    if (distortionEnable.floatValue == 1.0f)
-                    {
-                        EditorGUI.indentLevel++;
-                        m_MaterialEditor.ShaderProperty(distortionOnly, StylesBaseUnlit.distortionOnlyText);
-                        m_MaterialEditor.ShaderProperty(distortionDepthTest, StylesBaseUnlit.distortionDepthTestText);
-                        EditorGUI.indentLevel--;
-                    }
-                }
             }
             m_MaterialEditor.ShaderProperty(alphaCutoffEnable, StylesBaseUnlit.alphaCutoffEnableText);
             if (alphaCutoffEnable.floatValue == 1.0f)
             EditorGUI.indentLevel--;
         }
 
+        protected void DoDistortionInputsGUI()
+        {
+            if (distortionEnable != null)
+            {
+                m_MaterialEditor.ShaderProperty(distortionEnable, StylesBaseUnlit.distortionEnableText);
+
+                if (distortionEnable.floatValue == 1.0f)
+                {
+                    EditorGUI.indentLevel++;
+                    m_MaterialEditor.ShaderProperty(distortionBlendMode, StylesBaseUnlit.distortionBlendModeText);
+                    m_MaterialEditor.ShaderProperty(distortionOnly, StylesBaseUnlit.distortionOnlyText);
+                    m_MaterialEditor.ShaderProperty(distortionDepthTest, StylesBaseUnlit.distortionDepthTestText);
+
+                    EditorGUI.indentLevel++;
+                    m_MaterialEditor.TexturePropertySingleLine(StylesBaseUnlit.distortionVectorMapText, distortionVectorMap);
+                    EditorGUI.indentLevel++;
+                    m_MaterialEditor.ShaderProperty(distortionScale, StylesBaseUnlit.distortionScaleText);
+                    m_MaterialEditor.ShaderProperty(distortionBlurScale, StylesBaseUnlit.distortionBlurScaleText);
+                    float remapMin = distortionBlurRemapMin.floatValue;
+                    float remapMax = distortionBlurRemapMax.floatValue;
+                    EditorGUI.BeginChangeCheck();
+                    EditorGUILayout.MinMaxSlider(StylesBaseUnlit.distortionBlurRemappingText, ref remapMin, ref remapMax, 0.0f, 1.0f);
+                    if (EditorGUI.EndChangeCheck())
+                    {
+                        distortionBlurRemapMin.floatValue = remapMin;
+                        distortionBlurRemapMax.floatValue = remapMax;
+                    }
+                    EditorGUI.indentLevel--;
+
+                    EditorGUI.indentLevel--;
+
+                    EditorGUI.indentLevel--;
+                }
+            }
+        }
+
         static public void SetKeyword(Material m, string keyword, bool state)
         {
             if (state)
                 else
                 {
                     material.SetInt("_ZTestMode", (int)UnityEngine.Rendering.CompareFunction.Always);
+                }
+
+                var distortionBlendMode = material.GetInt(kDistortionBlendMode);
+                switch (distortionBlendMode)
+
+                {
+                    default:
+                    case 0: // Add
+                    {
+                        material.SetInt("_DistortionSrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
+                        material.SetInt("_DistortionDstBlend", (int)UnityEngine.Rendering.BlendMode.One);
+
+                        material.SetInt("_DistortionBlurSrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
+                        material.SetInt("_DistortionBlurDstBlend", (int)UnityEngine.Rendering.BlendMode.One);
+                        material.SetInt("_DistortionBlurBlendOp", (int)UnityEngine.Rendering.BlendOp.Max);
+                            break;
+                    }
+                    case 1: // Multiply
+                        material.SetInt("_DistortionSrcBlend", (int)UnityEngine.Rendering.BlendMode.DstColor);
+                        material.SetInt("_DistortionDstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
+
+                        material.SetInt("_DistortionBlurSrcBlend", (int)UnityEngine.Rendering.BlendMode.DstAlpha);
+                        material.SetInt("_DistortionBlurDstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
+                        material.SetInt("_DistortionBlurBlendOp", (int)UnityEngine.Rendering.BlendOp.Add);
+                        break;
                 }
             }
 

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

 
             m_MaterialEditor.TexturePropertySingleLine(Styles.emissiveText, emissiveColorMap, emissiveColor);
             m_MaterialEditor.ShaderProperty(emissiveIntensity, Styles.emissiveIntensityText);
+
+            var surfaceTypeValue = (SurfaceType)surfaceType.floatValue;
+            if (surfaceTypeValue == SurfaceType.Transparent)
+            {
+                EditorGUILayout.Space();
+                EditorGUILayout.LabelField(StylesBaseUnlit.TransparencyInputsText, EditorStyles.boldLabel);
+                ++EditorGUI.indentLevel;
+
+                DoDistortionInputsGUI();
+
+                --EditorGUI.indentLevel;
+            }
         }
 
         protected override void VertexAnimationPropertiesGUI()

ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/Unlit.shader

         [ToggleOff] _DistortionEnable("Enable Distortion", Float) = 0.0
         [ToggleOff] _DistortionOnly("Distortion Only", Float) = 0.0
         [ToggleOff] _DistortionDepthTest("Distortion Depth Test Enable", Float) = 0.0
+        [Enum(Add, 0, Multiply, 1)] _DistortionBlendMode("Distortion Blend Mode", Int) = 0
+        [HideInInspector] _DistortionSrcBlend("Distortion Blend Src", Int) = 0
+        [HideInInspector] _DistortionDstBlend("Distortion Blend Dst", Int) = 0
+        [HideInInspector] _DistortionBlurSrcBlend("Distortion Blur Blend Src", Int) = 0
+        [HideInInspector] _DistortionBlurDstBlend("Distortion Blur Blend Dst", Int) = 0
+        [HideInInspector] _DistortionBlurBlendMode("Distortion Blur Blend Mode", Int) = 0
+        _DistortionScale("Distortion Scale", Float) = 1
+        _DistortionBlurScale("Distortion Blur Scale", Float) = 1
+        _DistortionBlurRemapMin("DistortionBlurRemapMin", Float) = 0.0
+        _DistortionBlurRemapMax("DistortionBlurRemapMax", Float) = 1.0
 
         [ToggleOff]  _AlphaCutoffEnable("Alpha Cutoff Enable", Float) = 0.0
         _AlphaCutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
             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 [_DistortionSrcBlend] [_DistortionDstBlend], [_DistortionBlurSrcBlend] [_DistortionBlurDstBlend]
+            BlendOp Add, [_DistortionBlurBlendOp]
             ZTest [_ZTestMode]
             ZWrite off
             Cull [_CullMode]

ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/UnlitData.hlsl

 
 #if (SHADERPASS == SHADERPASS_DISTORTION)
     float3 distortion = SAMPLE_TEXTURE2D(_DistortionVectorMap, sampler_DistortionVectorMap, input.texCoord0).rgb;
-    builtinData.distortion = distortion.rg;
-    builtinData.distortionBlur = distortion.b;
+    builtinData.distortion = distortion.rg * _DistortionScale;
+    builtinData.distortionBlur = clamp(distortion.b * _DistortionBlurScale, 0.0, 1.0) * (_DistortionBlurRemapMax - _DistortionBlurRemapMin) + _DistortionBlurRemapMin;
 #else
     builtinData.distortion = float2(0.0, 0.0);
     builtinData.distortionBlur = 0.0;

ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/UnlitProperties.hlsl

-float4  _Color;
+float4  _Color;
 TEXTURE2D(_ColorMap);
 SAMPLER2D(sampler_ColorMap);
 
 float _EmissiveIntensity;
 
 float _AlphaCutoff;
+float _DistortionScale;
+float _DistortionBlurScale;
+float _DistortionBlurRemapMin;
+float _DistortionBlurRemapMax;
 
 // Caution: C# code in BaseLitUI.cs call LightmapEmissionFlagsProperty() which assume that there is an existing "_EmissionColor"
 // value that exist to identify if the GI emission need to be enabled.

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,

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-timeCreated: 1507124092
+timeCreated: 1507194928
 licenseType: Pro
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   externalObjects: {}

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");
+        }
     }
 }

ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassDistortion.hlsl

     GetSurfaceAndBuiltinData(input, V, posInput, surfaceData, builtinData);
 
     float4 outBuffer;
-    EncodeDistortion(builtinData.distortion, builtinData.distortionBlur, outBuffer);
+    // Mark this pixel as eligible as source for distortion
+    EncodeDistortion(builtinData.distortion, builtinData.distortionBlur, true, outBuffer);
     return outBuffer;
 }

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+        m_Offset: {x: 0, y: 0}
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+        m_Offset: {x: 0, y: 0}
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+    - _AlphaCutoff: 0.5
+    - _AlphaCutoffEnable: 0
+    - _Anisotropy: 0
+    - _BlendMode: 0
+    - _CoatCoverage: 1
+    - _CoatIOR: 0.5
+    - _CullMode: 2
+    - _DepthOffsetEnable: 0
+    - _DetailAlbedoScale: 1
+    - _DetailNormalScale: 1
+    - _DetailSmoothnessScale: 1
+    - _DistortionBlendMode: 0
+    - _DistortionBlendOp: 0
+    - _DistortionBlurBlendMode: 0
+    - _DistortionBlurDstBlend: 1
+    - _DistortionBlurRemapMax: 1
+    - _DistortionBlurRemapMin: 0
+    - _DistortionBlurScale: 1.93
+    - _DistortionBlurSrcBlend: 1
+    - _DistortionDepthTest: 0
+    - _DistortionDstBlend: 1
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+    - _DistortionNullify: 0
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+    - _DistortionScale: 2.21
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+    - _Drag: 1
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+    - _EmissiveColorMode: 1
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+    - _EnableSpecularOcclusion: 0
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+    - _HeightAmplitude: 0.01
+    - _HeightCenter: 0.5
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+    - _IOR: 1
+    - _InitialBend: 1
+    - _MaterialID: 1
+    - _Metallic: 0
+    - _NormalMapSpace: 0
+    - _NormalScale: 1
+    - _PPDLodThreshold: 5
+    - _PPDMaxSamples: 15
+    - _PPDMinSamples: 5
+    - _PerPixelDisplacementObjectScale: 1
+    - _RefractionMode: 0
+    - _ShiverDirectionality: 0.5
+    - _ShiverDrag: 0.2
+    - _Smoothness: 1
+    - _SmoothnessRemapMax: 1
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+    - _SrcBlend: 5
+    - _StencilRef: 2
+    - _Stiffness: 1
+    - _SubsurfaceProfile: 0
+    - _SubsurfaceRadius: 1
+    - _SurfaceType: 1
+    - _TexWorldScale: 1
+    - _Thickness: 1
+    - _ThicknessMultiplier: 1
+    - _UVBase: 0
+    - _UVDetail: 0
+    - _VertexDisplacementObjectScale: 1
+    - _VertexDisplacementTilingScale: 1
+    - _ZTestMode: 8
+    - _ZWrite: 0
+    m_Colors:
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
+    - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
+    - _EmissionColor: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissiveColor: {r: 0, g: 0, b: 0, a: 1}
+    - _SpecularColor: {r: 1, g: 1, b: 1, a: 1}
+    - _TransmittanceColor: {r: 1, g: 1, b: 1, a: 1}
+    - _UVDetailsMappingMask: {r: 1, g: 0, b: 0, a: 0}
+    - _UVMappingMask: {r: 1, g: 0, b: 0, a: 0}

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ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/ApplyDistorsion.compute

+#include "../../Core/ShaderLibrary/Common.hlsl"
+#include "../Material/Builtin/BuiltinData.hlsl"
+
+TEXTURE2D(_DistortionTexture);
+TEXTURE2D(_GaussianPyramidColorTexture);
+RW_TEXTURE2D(float4, _CameraColorTexture);
+
+SamplerState sampler_GaussianPyramidColorTexture;
+
+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)
+{
+    // We use a bias when fetching distortion source pixels
+    // This avoid artifacts when a distortion is overlapped by an opaque object
+    const float _FetchBias = 0.9;
+
+    // Get distortion values
+    float4 encodedDistortion = LOAD_TEXTURE2D(_DistortionTexture, dispatchThreadId);
+
+    float2 distortion;
+    float distortionBlur;
+    bool distortionIsSourceValid;
+    DecodeDistortion(encodedDistortion, distortion, distortionBlur, distortionIsSourceValid);
+
+    // Reject the pixel if it is not in the distortion mask
+    if (!distortionIsSourceValid)
+        return;
+
+    int2 distortedEncodedDistortionId = dispatchThreadId + int2(distortion);
+
+    // Reject distortion if we try to fetch a pixel out of the buffer
+    if (any(distortedEncodedDistortionId < 0)
+        || any(distortedEncodedDistortionId > int2(_Size.xy)))
+        return;
+
+    // We fetch a second time the _DistortionTexture for the at the distorded coordinate
+    // Then we check if this pixels is in the distorded mask (eg: behind any distorted object)
+    // Otherwise we reject the distortion
+    float2 distordedDistortion;
+    float distordedDistortionBlur;
+    bool distordedIsSourceValid;
+    float4 encodedDistordedDistortion = LOAD_TEXTURE2D(_DistortionTexture, distortedEncodedDistortionId);
+    DecodeDistortion(encodedDistordedDistortion, distordedDistortion, distordedDistortionBlur, distordedIsSourceValid);
+
+    if (!distordedIsSourceValid)
+        return;
+     
+    // Get source pixel for distortion
+    float2 distordedUV = float2(dispatchThreadId + int2(distortion * _FetchBias)) * _Size.zw;
+    float mip = (_GaussianPyramidColorMipSize.z - 1) * clamp(distortionBlur, 0.0, 1.0);
+    float4 sampled = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, distordedUV, mip);
+
+    _CameraColorTexture[dispatchThreadId] = sampled;
+}

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/ApplyDistorsion.compute.meta

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SampleScenes/HDTest/GraphicTest/Common/AnimationController/DistortionTest.controller

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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
+        _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 _NoiseAmplitude;
+    float _NoiseLacunarity;
+
+    float3 permute(float3 x) { return ((x*34.0) + 1.0)*x % 289.0; }
+
+    float2 rand2(float2 p)
+    {
+        return frac(sin(float2(dot(p, float2(64321.9843, 8143.18321)), dot(p, float2(8312.153, 3218.1984)))) * 13218.2165);
+    }
+
+    #define SDF_VORONOI(pointTransform, name) float name(float2 value)\
+    {\
+        float2 o = floor(value);\
+        float2 f = frac(value);\
+        float r = 1;\
+        for (int y = -1; y <= 1; ++y)\
+        {\
+            for (int x = -1; x <= 1; ++x)\
+            {\
+                float2 cell = float2(float(x), float(y));\
+                float2 pCS = rand2(cell + o);\
+                pCS = pointTransform(pCS);\
+                float2 diff = cell + pCS - f;\
+                float dist = length(diff);\
+                    \
+                r = min(r, dist);\
+            }\
+        }\
+        \
+        return r;\
+    }
+
+    #define SDF_GRADIENT(sdf, name) float2 name(float2 value)\
+    {\
+        const float2 d = float2(0.0, 0.0001);\
+        float f00 = sdf(value + d.xx);\
+        float f01 = sdf(value + d.xy);\
+        float f10 = sdf(value + d.yx);\
+        float f11 = sdf(value + d.yy);\
+        return float2((f10 - f00 + f11 - f10) * 0.5, (f01 - f00 + f11 - f10) * 0.5);\
+    }
+
+    float snoise(float2 v) {
+        const float4 C = float4(0.211324865405187, 0.366025403784439,
+            -0.577350269189626, 0.024390243902439);
+        float2 i = floor(v + dot(v, C.yy));
+        float2 x0 = v - i + dot(i, C.xx);
+        float2 i1;
+        i1 = (x0.x > x0.y) ? float2(1.0, 0.0) : float2(0.0, 1.0);
+        float4 x12 = x0.xyxy + C.xxzz;
+        x12.xy -= i1;
+        i = i % 289.0;
+        float3 p = permute(permute(i.y + float3(0.0, i1.y, 1.0))
+            + i.x + float3(0.0, i1.x, 1.0));
+        float3 m = max(0.5 - float3(dot(x0, x0), dot(x12.xy, x12.xy),
+            dot(x12.zw, x12.zw)), 0.0);
+        m = m*m;
+        m = m*m;
+        float3 x = 2.0 * frac(p * C.www) - 1.0;
+        float3 h = abs(x) - 0.5;
+        float3 ox = floor(x + 0.5);
+        float3 a0 = x - ox;
+        m *= 1.79284291400159 - 0.85373472095314 * (a0*a0 + h*h);
+        float3 g;
+        g.x = a0.x  * x0.x + h.x  * x0.y;
+        g.yz = a0.yz * x12.xz + h.yz * x12.yw;
+        return 130.0 * dot(m, g);
+    }
+
+    float4 permute(float4 x) { return ((x*34.0) + 1.0)*x % 289.0; }
+    float4 taylorInvSqrt(float4 r) { return 1.79284291400159 - 0.85373472095314 * r; }
+
+    float snoise(float3 v) {
+        const float2  C = float2(1.0 / 6.0, 1.0 / 3.0);
+        const float4  D = float4(0.0, 0.5, 1.0, 2.0);
+
+        // First corner
+        float3 i = floor(v + dot(v, C.yyy));
+        float3 x0 = v - i + dot(i, C.xxx);
+
+        // Other corners
+        float3 g = step(x0.yzx, x0.xyz);
+        float3 l = 1.0 - g;
+        float3 i1 = min(g.xyz, l.zxy);
+        float3 i2 = max(g.xyz, l.zxy);
+
+        //  x0 = x0 - 0. + 0.0 * C 
+        float3 x1 = x0 - i1 + 1.0 * C.xxx;
+        float3 x2 = x0 - i2 + 2.0 * C.xxx;
+        float3 x3 = x0 - 1. + 3.0 * C.xxx;
+
+        // Permutations
+        i = i % 289.0;
+        float4 p = permute(permute(permute(
+            i.z + float4(0.0, i1.z, i2.z, 1.0))
+            + i.y + float4(0.0, i1.y, i2.y, 1.0))
+            + i.x + float4(0.0, i1.x, i2.x, 1.0));
+
+        // Gradients
+        // ( N*N points uniformly over a square, mapped onto an octahedron.)
+        float n_ = 1.0 / 7.0; // N=7
+        float3  ns = n_ * D.wyz - D.xzx;
+
+        float4 j = p - 49.0 * floor(p * ns.z *ns.z);  //  mod(p,N*N)
+
+        float4 x_ = floor(j * ns.z);
+        float4 y_ = floor(j - 7.0 * x_);    // mod(j,N)
+
+        float4 x = x_ *ns.x + ns.yyyy;
+        float4 y = y_ *ns.x + ns.yyyy;
+        float4 h = 1.0 - abs(x) - abs(y);
+
+        float4 b0 = float4(x.xy, y.xy);
+        float4 b1 = float4(x.zw, y.zw);
+
+        float4 s0 = floor(b0)*2.0 + 1.0;
+        float4 s1 = floor(b1)*2.0 + 1.0;
+        float4 sh = -step(h, float4(0.0, 0.0, 0.0, 0.0));
+
+        float4 a0 = b0.xzyw + s0.xzyw*sh.xxyy;
+        float4 a1 = b1.xzyw + s1.xzyw*sh.zzww;
+
+        float3 p0 = float3(a0.xy, h.x);
+        float3 p1 = float3(a0.zw, h.y);
+        float3 p2 = float3(a1.xy, h.z);
+        float3 p3 = float3(a1.zw, h.w);
+
+        //Normalise gradients
+        float4 norm = taylorInvSqrt(float4(dot(p0, p0), dot(p1, p1), dot(p2, p2), dot(p3, p3)));
+        p0 *= norm.x;
+        p1 *= norm.y;
+        p2 *= norm.z;
+        p3 *= norm.w;
+
+        // Mix final noise value
+        float4 m = max(0.6 - float4(dot(x0, x0), dot(x1, x1), dot(x2, x2), dot(x3, x3)), 0.0);
+        m = m * m;
+        return 42.0 * dot(m*m, float4(dot(p0, x0), dot(p1, x1),
+            dot(p2, x2), dot(p3, x3)));
+    }
+
+    float3 fbm2x3(float2 v, float a, float f)
+    {
+        float3 r = float3(0.0, 0.0, 0.0);
+
+        for (int i = 0; i < 6; ++i)
+        {
+            r += a * float3(snoise(v), snoise(v * 1.18142), snoise(v * 0.974236));
+            v *= f;
+            a *= a;
+        }
+
+        return r;
+    }
+
+    float fbm3(float3 v, float a, float f)
+    {
+        float r = float(0.0);
+
+        for (int i = 0; i < 6; ++i)
+        {
+            r += a * snoise(v);
+            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 = fbm2x3(p, _NoiseAmplitude, _NoiseLacunarity * (_SinTime.w * 0.1 + 1.0));
+
+                float2 distortion = s.xy * _DistortionAmplitude;
+                float blur = s.z;
+
+                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 * 0.5) * 0.1 + 1);
+
+                float3 n3 = fbm2x3(IN.globalTexcoord.xy * 5, _NoiseAmplitude, _NoiseLacunarity);
+                float n = fbm3(n3 + IN.globalTexcoord.xyx + _Time.w * 0.1, _NoiseAmplitude, _NoiseLacunarity);
+                float t = sin(n * 5 + _Time.w * 0.5) * 0.5 + 0.5;
+
+                float2 distortion = sin(n3.xy * s) * _DistortionAmplitude;
+                
+                float blur = (min(t, 1-t) * 2);
+
+                return float4(distortion, blur, 1.0);
+            }
+            ENDCG
+        }
+
+        Pass
+        {
+            Name "Voronoi"
+
+            CGPROGRAM
+            #include "UnityCustomRenderTexture.cginc"
+            #pragma vertex CustomRenderTextureVertexShader
+            #pragma fragment frag
+            #pragma target 3.0
+
+            float2 circlePoint(float2 p)
+            {
+                p = 0.5 + 0.5 * sin(_Time.w * 0.2 + 6.2831 * p);
+                return p;
+            }
+
+            SDF_VORONOI(circlePoint, sdfVoronoi)
+            SDF_GRADIENT(sdfVoronoi, sdfVoronoiGrad)
+
+            float4 frag(v2f_customrendertexture IN) : COLOR
+            {
+                float2 uv = IN.globalTexcoord.xy * _Size;
+                float v = sdfVoronoi(uv);
+                v = v * v * v;
+
+                float2 distortion = sdfVoronoiGrad(uv);
+
+                float blur = v;
+
+                return float4(distortion, blur, 1.0);
+            }
+            ENDCG
+        }
+    }
+}

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+        m_Offset: {x: 0, y: 0}
+    - _DetailMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _DistortionVectorMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _EmissiveColorMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _HeightMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _MainTex:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _MaskMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _NormalMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _NormalMapOS:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _SpecularColorMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _SubsurfaceRadiusMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _TangentMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _TangentMapOS:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _Tex:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    - _ThicknessMap:
+        m_Texture: {fileID: 0}
+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
+    m_Floats:
+    - _ATDistance: 1
+    - _AlbedoAffectEmissive: 0
+    - _AlphaCutoff: 0.5
+    - _AlphaCutoffEnable: 0
+    - _Amplitude: 205.16
+    - _Anisotropy: 0
+    - _BlendMode: 0
+    - _BlurAmplitude: 1
+    - _BlurMaxAmplitude: 0.874
+    - _BlurMinAmplitude: 0.251
+    - _CoatCoverage: 1
+    - _CoatIOR: 0.5
+    - _CullMode: 2
+    - _DepthOffsetEnable: 0
+    - _DetailAlbedoScale: 1
+    - _DetailNormalScale: 1
+    - _DetailSmoothnessScale: 1
+    - _DistorsionAmplitude: 52
+    - _DistortionAmplitude: 16
+    - _DistortionDepthTest: 0
+    - _DistortionEnable: 0
+    - _DistortionOnly: 0
+    - _DoubleSidedEnable: 0
+    - _DoubleSidedNormalMode: 1
+    - _Drag: 1
+    - _DstBlend: 0
+    - _EmissiveColorMode: 1
+    - _EmissiveIntensity: 0
+    - _EnablePerPixelDisplacement: 0
+    - _EnableSpecularOcclusion: 0
+    - _EnableVertexDisplacement: 0
+    - _EnableWind: 0
+    - _Float: 2.23
+    - _Glossiness: 0.5
+    - _HeightAmplitude: 0.01
+    - _HeightCenter: 0.5
+    - _HeightMax: 1
+    - _HeightMin: -1
+    - _IOR: 1
+    - _InitialBend: 1
+    - _MaterialID: 1
+    - _Metallic: 0
+    - _NoiseAmplitude: 0.401
+    - _NoiseLacunarity: 2.81
+    - _NormalMapSpace: 0
+    - _NormalScale: 1
+    - _PPDLodThreshold: 5
+    - _PPDMaxSamples: 15
+    - _PPDMinSamples: 5
+    - _PerPixelDisplacementObjectScale: 1
+    - _RefractionMode: 0
+    - _ShiverDirectionality: 0.5
+    - _ShiverDrag: 0.2
+    - _Size: 5
+    - _Smoothness: 1
+    - _SmoothnessRemapMax: 1
+    - _SmoothnessRemapMin: 0
+    - _SrcBlend: 1
+    - _StencilRef: 2
+    - _Stiffness: 1
+    - _SubsurfaceProfile: 0
+    - _SubsurfaceRadius: 1
+    - _SurfaceType: 0
+    - _TexWorldScale: 1
+    - _Thickness: 1
+    - _ThicknessMultiplier: 1
+    - _UVBase: 0
+    - _UVDetail: 0
+    - _VertexDisplacementObjectScale: 1
+    - _VertexDisplacementTilingScale: 1
+    - _ZTestMode: 8
+    - _ZWrite: 1
+    m_Colors:
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
+    - _Color: {r: 0.6691177, g: 0.30503896, b: 0.30503896, a: 1}
+    - _DoubleSidedConstants: {r: 1, g: 1, b: -1, a: 0}
+    - _EmissionColor: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissiveColor: {r: 0, g: 0, b: 0, a: 1}
+    - _RidgeThreshold: {r: 0.2, g: 0.2, b: 0.3, a: 0}
+    - _SpecularColor: {r: 1, g: 1, b: 1, a: 1}
+    - _TransmittanceColor: {r: 1, g: 1, b: 1, a: 1}
+    - _UVDetailsMappingMask: {r: 1, g: 0, b: 0, a: 0}
+    - _UVMappingMask: {r: 1, g: 0, b: 0, a: 0}