Merge pull request #442 from Unity-Technologies/feature/transparency

Feature/transparency

ScriptableRenderPipeline/HDRenderPipeline/Debug/DebugDisplay.cs

         public bool displayOpaqueObjects = true;
         public bool displayTransparentObjects = true;
         public bool enableDistortion = true;
+        public bool enableGaussianPyramid = true;
         public bool enableSSSAndTransmission = true;
     }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs

-using System.Collections.Generic;
+using System.Collections.Generic;
 using UnityEngine.Rendering;
 using System;
 using System.Linq;
         Material m_SssHorizontalFilterAndCombinePass;
         // <<< Old SSS Model
 
+        ComputeShader m_GaussianPyramidCS { get { return m_Asset.renderPipelineResources.gaussianPyramidCS; } }
+        int m_GaussianPyramidKernel;
+        ComputeShader m_DepthPyramidCS { get { return m_Asset.renderPipelineResources.depthPyramidCS; } }
+        int m_DepthPyramidKernel;
+
         Material m_CameraMotionVectorsMaterial;
 
         // Debug material
         // <<< Old SSS Model
         readonly int m_VelocityBuffer;
         readonly int m_DistortionBuffer;
+        readonly int m_GaussianPyramidColorBuffer;
+        readonly int m_DepthPyramidBuffer;
 
         readonly int m_DeferredShadowBuffer;
 
         // <<< Old SSS Model
         readonly RenderTargetIdentifier m_VelocityBufferRT;
         readonly RenderTargetIdentifier m_DistortionBufferRT;
+        readonly RenderTargetIdentifier m_GaussianPyramidColorBufferRT;
+        readonly RenderTargetIdentifier m_DepthPyramidBufferRT;
+        RenderTextureDescriptor m_GaussianPyramidColorBufferDesc;
+        RenderTextureDescriptor m_DepthPyramidBufferDesc;
 
         readonly RenderTargetIdentifier m_DeferredShadowBufferRT;
 
                 m_gbufferManager.gbufferCount++;
             }
             m_VelocityBufferRT = new RenderTargetIdentifier(m_VelocityBuffer);
+
+            m_DistortionBuffer = HDShaderIDs._DistortionTexture;
+            m_DistortionBufferRT = new RenderTargetIdentifier(m_DistortionBuffer);
+
+            m_GaussianPyramidKernel = m_GaussianPyramidCS.FindKernel("KMain");
+            m_GaussianPyramidColorBuffer = HDShaderIDs._GaussianPyramidColorTexture;
+            m_GaussianPyramidColorBufferRT = new RenderTargetIdentifier(m_GaussianPyramidColorBuffer);
+            m_GaussianPyramidColorBufferDesc = new RenderTextureDescriptor(2, 2, RenderTextureFormat.ARGBHalf, 0)
+            {
+                useMipMap = true,
+                autoGenerateMips = false
+            };
+
+            m_DepthPyramidKernel = m_DepthPyramidCS.FindKernel("KMain");
+            m_DepthPyramidBuffer = HDShaderIDs._DepthPyramidTexture;
+            m_DepthPyramidBufferRT = new RenderTargetIdentifier(m_DepthPyramidBuffer);
+            m_DepthPyramidBufferDesc = new RenderTextureDescriptor(2, 2, RenderTextureFormat.RFloat, 0)
+            {
+                useMipMap = true,
+                autoGenerateMips = false
+            };
 
             m_DistortionBuffer = HDShaderIDs._DistortionTexture;
             m_DistortionBufferRT = new RenderTargetIdentifier(m_DistortionBuffer);
 
             // In both forward and deferred, everything opaque should have been rendered at this point so we can safely copy the depth buffer for later processing.
             CopyDepthBufferIfNeeded(cmd);
+
+            RenderPyramidDepth(camera, cmd);
 
             // Required for the SSS and the shader feature classification pass.
             PrepareAndBindStencilTexture(cmd);
 
                 RenderSky(hdCamera, cmd);
 
+                RenderGaussianPyramidColor(camera, cmd);
+
                 // Render all type of transparent forward (unlit, lit, complex (hair...)) to keep the sorting between transparent objects.
                 RenderForward(m_CullResults, camera, renderContext, cmd, false);
 #if UNITY_EDITOR
             }
         }
 
+        void RenderGaussianPyramidColor(Camera camera, CommandBuffer cmd)
+        {
+            if (!m_CurrentDebugDisplaySettings.renderingDebugSettings.enableGaussianPyramid)
+                return;
+
+            using (new ProfilingSample("Gaussian Pyramid Color", cmd))
+            {
+                int w = camera.pixelWidth;
+                int h = camera.pixelHeight;
+                int size = Mathf.ClosestPowerOfTwo(Mathf.Min(w, h));
+
+                // The gaussian pyramid compute works in blocks of 8x8 so make sure the last lod has a
+                // minimum size of 8x8
+                int lodCount = Mathf.FloorToInt(Mathf.Log(size, 2f) - 3f);
+                if (lodCount > HDShaderIDs._GaussianPyramidColorMips.Length)
+                {
+                    Debug.LogWarningFormat("Cannot compute all mipmaps of the color pyramid, max texture size supported: {0}", (2 << HDShaderIDs._GaussianPyramidColorMips.Length).ToString());
+                    lodCount = HDShaderIDs._GaussianPyramidColorMips.Length;
+                }
+
+                cmd.SetGlobalVector(HDShaderIDs._GaussianPyramidColorMipSize, new Vector4(size, size, lodCount, 0));
+
+                cmd.Blit(m_CameraColorBufferRT, m_GaussianPyramidColorBuffer);
+
+                var last = m_GaussianPyramidColorBuffer;
+
+                for (int i = 0; i < lodCount; i++)
+                {
+                    size >>= 1;
+
+                    cmd.GetTemporaryRT(HDShaderIDs._GaussianPyramidColorMips[i + 1], size, size, 0, FilterMode.Bilinear, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear, 1, true);
+                    cmd.SetComputeTextureParam(m_GaussianPyramidCS, m_GaussianPyramidKernel, "_Source", last);
+                    cmd.SetComputeTextureParam(m_GaussianPyramidCS, m_GaussianPyramidKernel, "_Result", HDShaderIDs._GaussianPyramidColorMips[i + 1]);
+                    cmd.SetComputeVectorParam(m_GaussianPyramidCS, "_Size", new Vector4(size, size, 1f / size, 1f / size));
+                    cmd.DispatchCompute(m_GaussianPyramidCS, m_GaussianPyramidKernel, size / 8, size / 8, 1);
+                    cmd.CopyTexture(HDShaderIDs._GaussianPyramidColorMips[i + 1], 0, 0, m_GaussianPyramidColorBufferRT, 0, i + 1);
+
+                    last = HDShaderIDs._GaussianPyramidColorMips[i + 1];
+                }
+
+                cmd.SetGlobalTexture(HDShaderIDs._GaussianPyramidColorTexture, m_GaussianPyramidColorBuffer);
+
+                for (int i = 0; i < lodCount; i++)
+                    cmd.ReleaseTemporaryRT(HDShaderIDs._GaussianPyramidColorMips[i + 1]);
+            }
+        }
+
+        void RenderPyramidDepth(Camera camera, CommandBuffer cmd)
+        {
+            if (!m_CurrentDebugDisplaySettings.renderingDebugSettings.enableGaussianPyramid)
+                return;
+
+            using (new ProfilingSample("Pyramid Depth", cmd))
+            {
+                int w = camera.pixelWidth;
+                int h = camera.pixelHeight;
+                int size = Mathf.ClosestPowerOfTwo(Mathf.Min(w, h));
+
+                // The gaussian pyramid compute works in blocks of 8x8 so make sure the last lod has a
+                // minimum size of 8x8
+                int lodCount = Mathf.FloorToInt(Mathf.Log(size, 2f) - 3f);
+                if (lodCount > HDShaderIDs._DepthPyramidMips.Length)
+                {
+                    Debug.LogWarningFormat("Cannot compute all mipmaps of the depth pyramid, max texture size supported: {0}", (2 << HDShaderIDs._DepthPyramidMips.Length).ToString());
+                    lodCount = HDShaderIDs._DepthPyramidMips.Length;
+                }
+
+                cmd.SetGlobalVector(HDShaderIDs._DepthPyramidMipSize, new Vector4(size, size, lodCount, 0));
+
+                cmd.GetTemporaryRT(HDShaderIDs._DepthPyramidMips[0], size, size, 0, FilterMode.Bilinear, RenderTextureFormat.RFloat, RenderTextureReadWrite.Linear, 1, true);
+                HDUtils.SampleCopyChannel_xyzw2x(cmd, GetDepthTexture(), HDShaderIDs._DepthPyramidMips[0], new Vector2(size, size), m_Asset.renderPipelineResources);
+                cmd.CopyTexture(HDShaderIDs._DepthPyramidMips[0], 0, 0, m_DepthPyramidBuffer, 0, 0);
+
+                for (int i = 0; i < lodCount; i++)
+                {
+                    size >>= 1;
+
+                    cmd.GetTemporaryRT(HDShaderIDs._DepthPyramidMips[i + 1], size, size, 0, FilterMode.Bilinear, RenderTextureFormat.RFloat, RenderTextureReadWrite.Linear, 1, true);
+                    cmd.SetComputeTextureParam(m_DepthPyramidCS, m_DepthPyramidKernel, "_Source", HDShaderIDs._DepthPyramidMips[i]);
+                    cmd.SetComputeTextureParam(m_DepthPyramidCS, m_DepthPyramidKernel, "_Result", HDShaderIDs._DepthPyramidMips[i + 1]);
+                    cmd.SetComputeVectorParam(m_DepthPyramidCS, "_Size", new Vector4(size, size, 1f / size, 1f / size));
+                    cmd.DispatchCompute(m_DepthPyramidCS, m_DepthPyramidKernel, size / 8, size / 8, 1);
+                    cmd.CopyTexture(HDShaderIDs._DepthPyramidMips[i + 1], 0, 0, m_DepthPyramidBufferRT, 0, i + 1);
+                }
+
+                cmd.SetGlobalTexture(HDShaderIDs._DepthPyramidTexture, m_DepthPyramidBuffer);
+
+                for (int i = 0; i < lodCount + 1; i++)
+                    cmd.ReleaseTemporaryRT(HDShaderIDs._DepthPyramidMips[i]);
+            }
+        }
+
         void RenderDistortion(CullResults cullResults, Camera camera, ScriptableRenderContext renderContext, CommandBuffer cmd)
         {
             if (!m_CurrentDebugDisplaySettings.renderingDebugSettings.enableDistortion)
                     cmd.GetTemporaryRT(m_CameraColorBuffer,              w, h, 0, FilterMode.Point, RenderTextureFormat.ARGBHalf,       RenderTextureReadWrite.Linear, 1, true); // Enable UAV
                     cmd.GetTemporaryRT(m_CameraSssDiffuseLightingBuffer, w, h, 0, FilterMode.Point, RenderTextureFormat.RGB111110Float, RenderTextureReadWrite.Linear, 1, true); // Enable UAV
                     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));
+                    m_GaussianPyramidColorBufferDesc.width = s;
+                    m_GaussianPyramidColorBufferDesc.height = s;
+                    cmd.GetTemporaryRT(m_GaussianPyramidColorBuffer, m_GaussianPyramidColorBufferDesc, FilterMode.Trilinear);
+
+                    m_DepthPyramidBufferDesc.width = s;
+                    m_DepthPyramidBufferDesc.height = s;
+                    cmd.GetTemporaryRT(m_DepthPyramidBuffer, m_DepthPyramidBufferDesc, FilterMode.Trilinear);
+                    // End
 
                     if (!m_Asset.renderingSettings.ShouldUseForwardRenderingOnly())
                     {

ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipelineAsset.asset

   renderingSettings:
     useForwardRenderingOnly: 0
     useDepthPrepassWithDeferredRendering: 0
+    renderAlphaTestOnlyInDeferredPrepass: 0
-    texturingModeFlags: 1
-    transmissionFlags: 5460
+    texturingModeFlags: 0
+    transmissionFlags: 5462
-    - {x: 0, y: 12.031147, z: 0, w: 0}
+    - {x: 0, y: 8.152544, z: 0, w: 0}
     - {x: 0, y: 0.2873168, z: 0, w: 0}
     - {x: 0, y: 5, z: 0, w: 0}
     - {x: 0, y: 12.031147, z: 0, w: 0}

ScriptableRenderPipeline/HDRenderPipeline/HDStringConstants.cs

 
         internal static readonly int _VelocityTexture = Shader.PropertyToID("_VelocityTexture");
         internal static readonly int _DistortionTexture = Shader.PropertyToID("_DistortionTexture");
+        internal static readonly int _GaussianPyramidColorTexture = Shader.PropertyToID("_GaussianPyramidColorTexture");
+        internal static readonly int _DepthPyramidTexture = Shader.PropertyToID("_PyramidDepthTexture");
+        internal static readonly int _GaussianPyramidColorMipSize = Shader.PropertyToID("_GaussianPyramidColorMipSize");
+        internal static readonly int[] _GaussianPyramidColorMips =
+        {
+            Shader.PropertyToID("_GaussianColorMip0"),
+            Shader.PropertyToID("_GaussianColorMip1"),
+            Shader.PropertyToID("_GaussianColorMip2"),
+            Shader.PropertyToID("_GaussianColorMip3"),
+            Shader.PropertyToID("_GaussianColorMip4"),
+            Shader.PropertyToID("_GaussianColorMip5"),
+            Shader.PropertyToID("_GaussianColorMip6"),
+            Shader.PropertyToID("_GaussianColorMip7"),
+            Shader.PropertyToID("_GaussianColorMip8"),
+            Shader.PropertyToID("_GaussianColorMip9"),
+            Shader.PropertyToID("_GaussianColorMip10"),
+            Shader.PropertyToID("_GaussianColorMip11"),
+            Shader.PropertyToID("_GaussianColorMip12"),
+            Shader.PropertyToID("_GaussianColorMip13"),
+            Shader.PropertyToID("_GaussianColorMip14"),
+        };
+        internal static readonly int _DepthPyramidMipSize = Shader.PropertyToID("_PyramidDepthMipSize");
+        internal static readonly int[] _DepthPyramidMips =
+        {
+            Shader.PropertyToID("_DepthPyramidMip0"),
+            Shader.PropertyToID("_DepthPyramidMip1"),
+            Shader.PropertyToID("_DepthPyramidMip2"),
+            Shader.PropertyToID("_DepthPyramidMip3"),
+            Shader.PropertyToID("_DepthPyramidMip4"),
+            Shader.PropertyToID("_DepthPyramidMip5"),
+            Shader.PropertyToID("_DepthPyramidMip6"),
+            Shader.PropertyToID("_DepthPyramidMip7"),
+            Shader.PropertyToID("_DepthPyramidMip8"),
+            Shader.PropertyToID("_DepthPyramidMip9"),
+            Shader.PropertyToID("_DepthPyramidMip10"),
+            Shader.PropertyToID("_DepthPyramidMip11"),
+            Shader.PropertyToID("_DepthPyramidMip12"),
+            Shader.PropertyToID("_DepthPyramidMip13"),
+            Shader.PropertyToID("_DepthPyramidMip14"),
+        };
         internal static readonly int _DebugFullScreenTexture = Shader.PropertyToID("_DebugFullScreenTexture");
 
         internal static readonly int _WorldScales = Shader.PropertyToID("_WorldScales");
         internal static readonly int _GlobalFog_Extinction = Shader.PropertyToID("_GlobalFog_Extinction");
         internal static readonly int _GlobalFog_Asymmetry  = Shader.PropertyToID("_GlobalFog_Asymmetry");
         internal static readonly int _GlobalFog_Scattering = Shader.PropertyToID("_GlobalFog_Scattering");
+
+        internal static readonly int _Size = Shader.PropertyToID("_Size");
+        internal static readonly int _Source4 = Shader.PropertyToID("_Source4");
+        internal static readonly int _Result1 = Shader.PropertyToID("_Result1");
     }
 }

ScriptableRenderPipeline/HDRenderPipeline/HDUtils.cs

-#if UNITY_EDITOR
+#if UNITY_EDITOR
+using UnityEngine.Rendering;
+
 #endif
 
 namespace UnityEngine.Experimental.Rendering.HDPipeline
 
             return path;
         }
+
+        public static string GetPostProcessingPath()
+        {
+            var hdrpPath = GetHDRenderPipelinePath();
+            var fullPath = Path.GetFullPath(hdrpPath + "../../PostProcessing/PostProcessing");
+            var relativePath = fullPath.Substring(fullPath.IndexOf("Assets"));
+            return relativePath.Replace("\\", "/") + "/";
+        }
 #endif
 
         public const RendererConfiguration k_RendererConfigurationBakedLighting = RendererConfiguration.PerObjectLightProbe | RendererConfiguration.PerObjectLightmaps | RendererConfiguration.PerObjectLightProbeProxyVolume;
                 y -= s_OverlayLineHeight;
                 s_OverlayLineHeight = -1.0f;
             }
+        }
+
+        public static void SampleCopyChannel_xyzw2x(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier target, Vector2 size, RenderPipelineResources resources)
+        {
+            var s = new Vector4(size.x, size.y, 1f / size.x, 1f / size.y);
+            cmd.SetComputeVectorParam(resources.copyChannelCS, HDShaderIDs._Size, s);
+            cmd.SetComputeTextureParam(resources.copyChannelCS, resources.copyChannelKernel_xyzw2x, HDShaderIDs._Source4, source);
+            cmd.SetComputeTextureParam(resources.copyChannelCS, resources.copyChannelKernel_xyzw2x, HDShaderIDs._Result1, target);
+            cmd.DispatchCompute(resources.copyChannelCS, resources.copyChannelKernel_xyzw2x, (int)(size.x) / 8, (int)(size.y) / 8, 1);
         }
     }
 }

ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.cs

             Area        = 1 << 9,
             Directional = 1 << 10,
             Env         = 1 << 11,
-            Sky         = 1 << 12  // If adding more light be sure to not overflow LightDefinitions.s_LightFeatureMaskFlags
+            Sky         = 1 << 12,
+            SSL         = 1 << 13  // If adding more light be sure to not overflow LightDefinitions.s_LightFeatureMaskFlags
         }
 
         [GenerateHLSL]

ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.cs.hlsl

 #define LIGHTFEATUREFLAGS_DIRECTIONAL (1024)
 #define LIGHTFEATUREFLAGS_ENV (2048)
 #define LIGHTFEATUREFLAGS_SKY (4096)
+#define LIGHTFEATUREFLAGS_SSL (8192)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.TilePass.LightDefinitions:  static fields

ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.hlsl

 
     float3 envDiffuseLighting;
     float3 envSpecularLighting;
+
+    float envDiffuseLightingWeight;
 };
 
 //-----------------------------------------------------------------------------

ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePassLoop.hlsl

         #endif
     }
 
-    if (featureFlags & LIGHTFEATUREFLAGS_ENV || featureFlags & LIGHTFEATUREFLAGS_SKY)
+    float  totalIblWeight = 0.0; // Max: 1
+
+    if (featureFlags & LIGHTFEATUREFLAGS_SSL)
-        float  totalIblWeight      = 0.0; // Max: 1
+        // SSR and rough refraction
+        float3 localDiffuseLighting, localSpecularLighting;
+        float2 weight;
+        EvaluateBSDF_SSL(V, posInput, bsdfData, localDiffuseLighting, localSpecularLighting, weight);
+        applyWeigthedIblLighting(localDiffuseLighting, localSpecularLighting, weight, accLighting.envDiffuseLighting, accLighting.envSpecularLighting, totalIblWeight);
+        accLighting.envDiffuseLightingWeight = weight.x;
+    }
+    if (featureFlags & LIGHTFEATUREFLAGS_ENV || featureFlags & LIGHTFEATUREFLAGS_SKY)
+    {
         // Reflection probes are sorted by volume (in the increasing order).
         if (featureFlags & LIGHTFEATUREFLAGS_ENV)
         {

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

             public static GUIContent albedoAffectEmissiveText = new GUIContent("Albedo Affect Emissive", "Specifies whether or not the emissive color is multiplied by the albedo.");
 
             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");
+            public static GUIContent refractionThicknessMultiplierText = new GUIContent("Refraction Thickness multiplier", "Thickness multiplier");
+            public static GUIContent refractionThicknessMapText = new GUIContent("Refraction Thickness Map (R)", "Thickness multiplier");
+            // Transparency absorption
+            public static GUIContent transmittanceColorText = new GUIContent("Transmittance Color", "Absorption color (RGB)");
+            public static GUIContent atDistanceText = new GUIContent("Transmittance Absorption Distance", "Absorption distance reference");
         }
 
         // Lit shader is not layered but some layered materials inherit from it. In order to share code we need LitUI to account for this.
         protected MaterialProperty enableSpecularOcclusion = null;
         protected const string kEnableSpecularOcclusion = "_EnableSpecularOcclusion";
 
+        // transparency params
+        protected MaterialProperty ior = null;
+        protected const string kIOR = "_IOR";
+        protected MaterialProperty transmittanceColor = null;
+        protected const string kTransmittanceColor = "_TransmittanceColor";
+        protected MaterialProperty atDistance = null;
+        protected const string kATDistance = "_ATDistance";
+        protected MaterialProperty thicknessMultiplier = null;
+        protected const string kThicknessMultiplier = "_ThicknessMultiplier";
+        protected MaterialProperty refractionMode = null;
+        protected const string kRefractionMode = "_RefractionMode";
+
         protected void FindMaterialLayerProperties(MaterialProperty[] props)
         {
             for (int i = 0; i < m_LayerCount; ++i)
             // clear coat
             coatCoverage = FindProperty(kCoatCoverage, props);
             coatIOR = FindProperty(kCoatIOR, props);
+
+            // Transparency
+            refractionMode = FindProperty(kRefractionMode, props, false);
+            transmittanceColor = FindProperty(kTransmittanceColor, props, false);
+            atDistance = FindProperty(kATDistance, props, false);
+            thicknessMultiplier = FindProperty(kThicknessMultiplier, props, false);
+            ior = FindProperty(kIOR, props, false);
+            // We reuse thickness from SSS
         }
 
         protected void ShaderSSSInputGUI(Material material)
             m_MaterialEditor.ShaderProperty(detailSmoothnessScale[layerIndex], Styles.detailSmoothnessScaleText);
 
             EditorGUI.indentLevel--;
+
+            var surfaceTypeValue = (SurfaceType)surfaceType.floatValue;
+            if (surfaceTypeValue == SurfaceType.Transparent
+                && refractionMode != null)
+            {
+                EditorGUILayout.Space();
+                EditorGUILayout.LabelField(Styles.TransparencyInputsText, EditorStyles.boldLabel);
+                ++EditorGUI.indentLevel;
+
+                m_MaterialEditor.ShaderProperty(refractionMode, Styles.refractionModeText);
+                var mode = (Lit.RefractionMode)refractionMode.floatValue;
+                if (mode != Lit.RefractionMode.None)
+                {
+                    m_MaterialEditor.ShaderProperty(ior, Styles.refractionIORText);
+
+                    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);
+                    ++EditorGUI.indentLevel;
+                    m_MaterialEditor.ShaderProperty(atDistance, Styles.atDistanceText);
+                    --EditorGUI.indentLevel;
+                }
+                --EditorGUI.indentLevel;
+            }
         }
 
         private void DoEmissiveGUI(Material material)
             SetKeyword(material, "_MATID_ANISO", materialId == Lit.MaterialId.LitAniso);
             SetKeyword(material, "_MATID_SPECULAR", materialId == Lit.MaterialId.LitSpecular);
             SetKeyword(material, "_MATID_CLEARCOAT", materialId == Lit.MaterialId.LitClearCoat);
+
+            var refractionModeValue = (Lit.RefractionMode)material.GetFloat(kRefractionMode);
+            SetKeyword(material, "_REFRACTION_THINPLANE", refractionModeValue == Lit.RefractionMode.ThinPlane);
+            SetKeyword(material, "_REFRACTION_THICKPLANE", refractionModeValue == Lit.RefractionMode.ThickPlane);
+            SetKeyword(material, "_REFRACTION_THICKSPHERE", refractionModeValue == Lit.RefractionMode.ThickSphere);
         }
     }
 } // namespace UnityEditor

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.cs

             public static float s_SkinSpecularValue = 0.028f;
         }
 
+        [GenerateHLSL(PackingRules.Exact)]
+        public enum RefractionMode
+        {
+            None = 0,
+            ThickPlane = 1,
+            ThickSphere = 2,
+            ThinPlane = 3
+        };
+
         //-----------------------------------------------------------------------------
         // SurfaceData
         //-----------------------------------------------------------------------------
             public float coatCoverage;
             [SurfaceDataAttributes("Coat IOR")]
             public float coatIOR; // Value is [0..1] for artists but the UI will display the value between [1..2]
+
+            // Transparency
+            [SurfaceDataAttributes("Indice of refraction")]
+            public float ior;
+            // Reuse thickness from SSS
+            [SurfaceDataAttributes("Transmittance Color")]
+            public Vector3 transmittanceColor;
+            [SurfaceDataAttributes("Transmittance Absorption Distance")]
+            public float atDistance;
         };
 
         //-----------------------------------------------------------------------------
             public Vector3 coatNormalWS;
             public float coatCoverage;
             public float coatIOR; // CoatIOR is in range[1..2] it is surfaceData + 1
+
+            // Transparency
+            public float ior;
+            // Reuse thickness from SSS
+            public Vector3 absorptionCoefficient;
         };
 
         //-----------------------------------------------------------------------------

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.cs.hlsl

 #define SKIN_SPECULAR_VALUE (0.028)
 
 //
+// UnityEngine.Experimental.Rendering.HDPipeline.Lit+RefractionMode:  static fields
+//
+#define REFRACTIONMODE_NONE (0)
+#define REFRACTIONMODE_THICK_PLANE (1)
+#define REFRACTIONMODE_THICK_SPHERE (2)
+#define REFRACTIONMODE_THIN_PLANE (3)
+
+//
 // UnityEngine.Experimental.Rendering.HDPipeline.Lit+SurfaceData:  static fields
 //
 #define DEBUGVIEW_LIT_SURFACEDATA_BASE_COLOR (1000)
 #define DEBUGVIEW_LIT_SURFACEDATA_COAT_NORMAL_WS (1013)
 #define DEBUGVIEW_LIT_SURFACEDATA_COAT_COVERAGE (1014)
 #define DEBUGVIEW_LIT_SURFACEDATA_COAT_IOR (1015)
+#define DEBUGVIEW_LIT_SURFACEDATA_IOR (1016)
+#define DEBUGVIEW_LIT_SURFACEDATA_TRANSMITTANCE_COLOR (1017)
+#define DEBUGVIEW_LIT_SURFACEDATA_AT_DISTANCE (1018)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.Lit+TransmissionType:  static fields
 #define DEBUGVIEW_LIT_BSDFDATA_COAT_NORMAL_WS (1048)
 #define DEBUGVIEW_LIT_BSDFDATA_COAT_COVERAGE (1049)
 #define DEBUGVIEW_LIT_BSDFDATA_COAT_IOR (1050)
+#define DEBUGVIEW_LIT_BSDFDATA_IOR (1051)
+#define DEBUGVIEW_LIT_BSDFDATA_ABSORPTION_COEFFICIENT (1052)
 
 //
 // UnityEngine.Experimental.Rendering.HDPipeline.Lit+GBufferMaterial:  static fields
     float3 coatNormalWS;
     float coatCoverage;
     float coatIOR;
+    float ior;
+    float3 transmittanceColor;
+    float atDistance;
 };
 
 // Generated from UnityEngine.Experimental.Rendering.HDPipeline.Lit+BSDFData
     float3 coatNormalWS;
     float coatCoverage;
     float coatIOR;
+    float ior;
+    float3 absorptionCoefficient;
 };
 
 //
             break;
         case DEBUGVIEW_LIT_SURFACEDATA_COAT_IOR:
             result = surfacedata.coatIOR.xxx;
+            break;
+        case DEBUGVIEW_LIT_SURFACEDATA_IOR:
+            result = surfacedata.ior.xxx;
+            break;
+        case DEBUGVIEW_LIT_SURFACEDATA_TRANSMITTANCE_COLOR:
+            result = surfacedata.transmittanceColor;
+            break;
+        case DEBUGVIEW_LIT_SURFACEDATA_AT_DISTANCE:
+            result = surfacedata.atDistance.xxx;
             break;
     }
 }
             break;
         case DEBUGVIEW_LIT_BSDFDATA_COAT_IOR:
             result = bsdfdata.coatIOR.xxx;
+            break;
+        case DEBUGVIEW_LIT_BSDFDATA_IOR:
+            result = bsdfdata.ior.xxx;
+            break;
+        case DEBUGVIEW_LIT_BSDFDATA_ABSORPTION_COEFFICIENT:
+            result = bsdfdata.absorptionCoefficient;
             break;
     }
 }

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.hlsl

 // TODO: Test if this is a win
 // #define LIT_USE_BSDF_PRE_LAMBDAV
 
+// Color pyramid (width, height, lodcount, Unused)
+float4 _GaussianPyramidColorMipSize;
+TEXTURE2D(_GaussianPyramidColorTexture);
+SAMPLER2D(sampler_GaussianPyramidColorTexture);
+
+// Depth pyramid (width, height, lodcount, Unused)
+float4 _PyramidDepthMipSize;
+TEXTURE2D(_PyramidDepthTexture);
+SAMPLER2D(sampler_PyramidDepthTexture);
+
 // Area light textures specific constant
 SamplerState ltc_linear_clamp_sampler;
 // TODO: This one should be set into a constant Buffer at pass frequency (with _Screensize)
     bsdfData.coatCoverage = coatCoverage;
 }
 
+void FillMaterialIdTransparencyData(float ior, float3 transmittanceColor, float atDistance, float thickness, inout BSDFData bsdfData)
+{
+    // Uses thickness from SSS's property set
+    bsdfData.ior = ior;
+    // Absorption coefficient from Disney: http://blog.selfshadow.com/publications/s2015-shading-course/burley/s2015_pbs_disney_bsdf_notes.pdf
+    bsdfData.absorptionCoefficient = -log(transmittanceColor + 0.00001) / max(atDistance, 0.000001);
+    bsdfData.thickness = max(0.0001, thickness);
+}
+
 // For image based lighting, a part of the BSDF is pre-integrated.
 // This is done both for specular and diffuse (in case of DisneyDiffuse)
 void GetPreIntegratedFGD(float NdotV, float perceptualRoughness, float3 fresnel0, out float3 specularFGD, out float diffuseFGD)
         FillMaterialIdStandardData(surfaceData.baseColor, surfaceData.metallic, bsdfData);
         FillMaterialIdClearCoatData(surfaceData.coatNormalWS, surfaceData.coatCoverage, surfaceData.coatIOR, bsdfData);
     }
+
+#if defined(_REFRACTION_THINPLANE) || defined(_REFRACTION_THICKPLANE) || defined(_REFRACTION_THICKSPHERE)
+    // Note: Will override thickness of SSS's property set
+    FillMaterialIdTransparencyData(surfaceData.ior, surfaceData.transmittanceColor, surfaceData.atDistance, surfaceData.thickness, bsdfData);
+#endif
 
     return bsdfData;
 }
 }
 
 //-----------------------------------------------------------------------------
+// EvaluateBSDF_SSL
+// ----------------------------------------------------------------------------
+
+void EvaluateBSDF_SSL(float3 V, PositionInputs posInput, BSDFData bsdfData, out float3 diffuseLighting, out float3 specularLighting, out float2 weight)
+{
+    diffuseLighting = float3(0.0, 0.0, 0.0);
+    specularLighting = float3(0.0, 0.0, 0.0);
+    weight = float2(0.0, 0.0);
+
+#if defined(_REFRACTION_THINPLANE) || defined(_REFRACTION_THICKPLANE) || defined(_REFRACTION_THICKSPHERE)
+    // Refraction process:
+    //  1. Depending on the shape model, we calculate the refracted point in world space and the optical depth
+    //  2. We calculate the screen space position of the refracted point
+    //  3. If this point is available (ie: in color GBuffer and point is not in front of the object)
+    //    a. Get the corresponding color depending on the roughness from the gaussian pyramid of the color buffer
+    //    b. Multiply by the transmittance for absorption (depends on the optical depth)
+
+    weight.x = 1.0;
+
+    float3 refractedBackPointWS = float3(0.0, 0.0, 0.0);
+    float opticalDepth = 0.0;
+
+    // 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.)
+#if defined(_REFRACTION_THICKPLANE)
+    // Thick plane shape model:
+    //  We approximate locally the shape of the object as halfspace defined by the normal {bsdfData.normallWS} at {bsdfData.positionWS}
+    //  Thus, the light is refracted once.
+    //  It approximate cubic filled shapes
+    //
+    // However, we can't approximate the optical depth of the object, so we use a constant as parameter ({bsdfData.thickness})
+    
+    // Refracted ray
+    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 depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
+
+    // Distance from point to the back plane
+    float distFromP = depth - posInput.depthVS;
+
+    float VoR = dot(-V, R);
+    refractedBackPointWS = posInput.positionWS + R * distFromP / VoR;
+    opticalDepth = bsdfData.thickness;
+
+#elif defined(_REFRACTION_THICKSPHERE)
+    // Thick sphere shape model:
+    //  We approximate locally the shape of the object as sphere, that is tangent to the shape.
+    //  The sphere has a diameter of {bsdfData.thickness}
+    //  The center of the sphere is at {bsdfData.positionWS} - {bsdfData.normalWS} * {bsdfData.thickness}
+    //
+    //  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 depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
+
+    // Distance from point to the back plane
+    float depthFromPosition = depth - posInput.depthVS;
+
+    // First refraction (tangent sphere in)
+    // Refracted ray
+    float3 R1 = refract(-V, bsdfData.normalWS, 1.0 / bsdfData.ior);
+    // Center of the tangent sphere
+    float3 C = posInput.positionWS - bsdfData.normalWS * bsdfData.thickness * 0.5;
+
+    // Second refraction (tangent sphere out)
+    float NoR1 = dot(bsdfData.normalWS, R1);
+    // Optical depth within the sphere
+    opticalDepth = -NoR1 * bsdfData.thickness;
+    // Out hit point in the tangent sphere
+    float3 P1 = posInput.positionWS + R1 * opticalDepth;
+    // Out normal
+    float3 N1 = normalize(C - P1);
+    // Out refracted ray
+    float3 R2 = refract(R1, N1, bsdfData.ior);
+    float N1oR2 = dot(N1, R2);
+    float VoR1 = dot(V, R1);
+
+    // Refracted source point
+    refractedBackPointWS = P1 - R2 * (depthFromPosition - NoR1 * VoR1 * bsdfData.thickness) / N1oR2;
+
+#elif defined(_REFRACTION_THINPLANE)
+    // Thin plane shape model:
+    //  We approximate locally the shape of the object as a plane with normal {bsdfData.normalWS} at {bsdfData.positionWS}
+    //  with a thickness {bsdfData.thickness}
+
+    // Refracted ray
+    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 depth = LinearEyeDepth(pyramidDepth, _ZBufferParams);
+
+    // Distance from point to the back plane
+    float distFromP = depth - posInput.depthVS;
+
+    // Optical depth within the thin plane
+    opticalDepth = bsdfData.thickness / dot(R, -bsdfData.normalWS);
+
+    // The refracted ray exiting the thin plane is the same as the incident ray (parallel interfaces and same ior)
+    float VoR = dot(-V, R);
+    float VoN = dot(V, bsdfData.normalWS);
+    refractedBackPointWS = posInput.positionWS + R * opticalDepth - V * (distFromP - VoR * opticalDepth);
+#endif
+
+    // 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);
+
+    // Exit if texel is out of color buffer
+    // Or if the texel is from an object in front of the object
+    if (refractedBackPointDepth < posInput.depthVS
+        || any(refractedBackPointSS < 0.0)
+        || any(refractedBackPointSS > 1.0))
+    {
+        diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, posInput.positionSS, 0.0).rgb;
+        return;
+    }
+
+    // Map the roughness to the correct mip map level of the color pyramid
+    float mipLevel = PerceptualRoughnessToMipmapLevel(bsdfData.perceptualRoughness);
+    diffuseLighting = SAMPLE_TEXTURE2D_LOD(_GaussianPyramidColorTexture, sampler_GaussianPyramidColorTexture, refractedBackPointSS.xy, mipLevel).rgb;
+
+    // Beer-Lamber law for absorption
+    float3 transmittance = exp(-bsdfData.absorptionCoefficient * opticalDepth);
+    diffuseLighting *= transmittance;
+
+#else
+    // 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;
+#endif
+}
+
+//-----------------------------------------------------------------------------
 // EvaluateBSDF_Env
 // ----------------------------------------------------------------------------
 
 
     // TODO: we could call a function like PostBSDF that will apply albedo and divide by PI once for the loop
 
-    // envDiffuseLighting is not used in our case
-    diffuseLighting = (accLighting.dirDiffuseLighting + accLighting.punctualDiffuseLighting + accLighting.areaDiffuseLighting) * GTAOMultiBounce(lightLoopContext.directAmbientOcclusion, bsdfData.diffuseColor) + bakeDiffuseLighting;
+    // envDiffuseLighting is used for refraction
+    diffuseLighting = accLighting.envDiffuseLighting * accLighting.envDiffuseLightingWeight + (1.0 - accLighting.envDiffuseLightingWeight) * ((accLighting.dirDiffuseLighting + accLighting.punctualDiffuseLighting + accLighting.areaDiffuseLighting) * GTAOMultiBounce(lightLoopContext.directAmbientOcclusion, bsdfData.diffuseColor) + bakeDiffuseLighting);
     specularLighting = accLighting.dirSpecularLighting + accLighting.punctualSpecularLighting + accLighting.areaSpecularLighting + accLighting.envSpecularLighting;
 }
 

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

         [ToggleOff]  _AlphaCutoffEnable("Alpha Cutoff Enable", Float) = 0.0
         _AlphaCutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
 
+        // Transparency
+        [Enum(None, 0, ThickPlane, 1, ThickSphere, 2, ThinPlane, 3)]_RefractionMode("Refraction Mode", Int) = 0
+        _IOR("Indice Of Refraction", Range(1.0, 2.5)) = 1.0
+        _ThicknessMultiplier("Thickness Multiplier", Float) = 1.0
+        _TransmittanceColor("Transmittance Color", Color) = (1.0, 1.0, 1.0)
+        _ATDistance("Transmittance Absorption Distance", Float) = 1.0
+
         // Stencil state
         [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilLightingUsage.RegularLighting  (fixed at compile time)
 
     #pragma shader_feature _VERTEX_DISPLACEMENT_OBJECT_SCALE
     #pragma shader_feature _VERTEX_DISPLACEMENT_TILING_SCALE
     #pragma shader_feature _VERTEX_WIND
+    #pragma shader_feature _ _REFRACTION_THINPLANE _REFRACTION_THICKPLANE _REFRACTION_THICKSPHERE
 
     #pragma shader_feature _ _MAPPING_PLANAR _MAPPING_TRIPLANAR
     #pragma shader_feature _NORMALMAP_TANGENT_SPACE

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

     surfaceData.coatCoverage = 0.0f;
     surfaceData.coatIOR = 0.5;
 
+    // Transparency parameters
+    // Use thickness from SSS
+    surfaceData.ior = 1.0;
+    surfaceData.transmittanceColor = float3(1.0, 1.0, 1.0);
+    surfaceData.atDistance = 1000000.0;
+
     GetNormalWS(input, V, normalTS, surfaceData.normalWS);
     // Use bent normal to sample GI if available
     // If any layer use a bent normal map, then bentNormalTS contain the interpolated result of bentnormal and normalmap (in case no bent normal are available)

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitDataInternal.hlsl

-void ADD_IDX(ComputeLayerTexCoord)( float2 texCoord0, float2 texCoord1, float2 texCoord2, float2 texCoord3, float4 uvMappingMask, float4 uvMappingMaskDetail,
+void ADD_IDX(ComputeLayerTexCoord)( float2 texCoord0, float2 texCoord1, float2 texCoord2, float2 texCoord3, float4 uvMappingMask, float4 uvMappingMaskDetail,
                                     float3 positionWS, int mappingType, float worldScale, inout LayerTexCoord layerTexCoord, float additionalTiling = 1.0)
 {
     // Handle uv0, uv1, uv2, uv3 based on _UVMappingMask weight (exclusif 0..1)
     surfaceData.specularColor *= SAMPLE_UVMAPPING_TEXTURE2D(_SpecularColorMap, sampler_SpecularColorMap, layerTexCoord.base).rgb;
 #endif
 
+#if defined(_REFRACTION_THINPLANE) || defined(_REFRACTION_THICKPLANE) || defined(_REFRACTION_THICKSPHERE)
+    surfaceData.ior = _IOR;
+    surfaceData.transmittanceColor = _TransmittanceColor;
+    surfaceData.atDistance = _ATDistance;
+    // Thickness already defined with SSS (from both thickness and thicknessMap)
+    surfaceData.thickness *= _ThicknessMultiplier;
+#else
+    surfaceData.ior = 1.0;
+    surfaceData.transmittanceColor = float3(1.0, 1.0, 1.0);
+    surfaceData.atDistance = 1.0;
+#endif
+
     surfaceData.coatNormalWS    = input.worldToTangent[2].xyz; // Assign vertex normal
     surfaceData.coatCoverage    = _CoatCoverage;
     surfaceData.coatIOR         = _CoatIOR;
     surfaceData.coatNormalWS = float3(0.0, 0.0, 0.0);
     surfaceData.coatCoverage = 0.0f;
     surfaceData.coatIOR = 0.5;
+
+    // Transparency
+    surfaceData.ior = 1.0;
+    surfaceData.transmittanceColor = float3(1.0, 1.0, 1.0);
+    surfaceData.atDistance = 1000000.0;
 
 #endif // #if !defined(LAYERED_LIT_SHADER)
 

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitProperties.hlsl

 
 float _EnableSpecularOcclusion;
 
+// Transparency
+float3 _TransmittanceColor;
+float _IOR;
+float _ATDistance;
+float _ThicknessMultiplier;
+
 // 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.
 // In our case we don't use such a mechanism but need to keep the code quiet. We declare the value and always enable it.

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

         [ToggleOff]  _AlphaCutoffEnable("Alpha Cutoff Enable", Float) = 0.0
         _AlphaCutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
 
+        // Transparency
+        [Enum(None, 0, ThickPlane, 1, ThickSphere, 2, ThinPlane, 3)]_RefractionMode("Refraction Mode", Int) = 0
+        _IOR("Indice Of Refraction", Range(1.0, 2.5)) = 1.0
+        _ThicknessMultiplier("Thickness Multiplier", Float) = 1.0
+        _TransmittanceColor("Transmittance Color", Color) = (1.0, 1.0, 1.0)
+        _ATDistance("Transmittance Absorption Distance", Float) = 1.0
+
         // Stencil state
         [HideInInspector] _StencilRef("_StencilRef", Int) = 2 // StencilLightingUsage.RegularLighting  (fixed at compile time)
 

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/HDRenderPipelineResources.asset

     type: 3}
   volumetricLightingCS: {fileID: 7200000, guid: 799166e2ee6a4b041bba9e74f6942097,
     type: 3}
+  gaussianPyramidCS: {fileID: 7200000, guid: 6dba4103d23a7904fbc49099355aff3e, type: 3}
+  depthPyramidCS: {fileID: 7200000, guid: 64a553bb564274041906f78ffba955e4, type: 3}
+  copyChannelCS: {fileID: 7200000, guid: 4e910cec38a1ec640a03324015e036d0, type: 3}
   clearDispatchIndirectShader: {fileID: 7200000, guid: fc1f553acb80a6446a32d33e403d0656,
     type: 3}
   buildDispatchIndirectShader: {fileID: 7200000, guid: 4eb1b418be7044c40bb5200496c50f14,

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/HDRenderPipelineResources.asset.meta

 fileFormatVersion: 2
 guid: 42086e81f4f0c724f96f7f09cc995354
-timeCreated: 1505146899
+timeCreated: 1507102386
 licenseType: Pro
 NativeFormatImporter:
   externalObjects: {}

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/RenderPipelineResources.cs

             var instance = CreateInstance<RenderPipelineResources>();
 
             string HDRenderPipelinePath = HDUtils.GetHDRenderPipelinePath();
+            string PostProcessingPath = HDUtils.GetPostProcessingPath();
 
             instance.debugDisplayLatlongShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Debug/DebugDisplayLatlong.Shader");
             instance.debugViewMaterialGBufferShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Debug/DebugViewMaterialGBuffer.Shader");
             instance.screenSpaceAmbientOcclusionShader = UnityEditor.AssetDatabase.LoadAssetAtPath<Shader>(HDRenderPipelinePath + "Lighting/AmbientOcclusion/ScreenSpaceAmbientOcclusion.Shader");
             instance.subsurfaceScatteringCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Material/Lit/Resources/SubsurfaceScattering.compute");
             instance.volumetricLightingCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/Volumetrics/Resources/VolumetricLighting.compute");
+            instance.gaussianPyramidCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(PostProcessingPath + "Shaders/Builtins/GaussianDownsample.compute");
+            instance.depthPyramidCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "RenderPipelineResources/DepthDownsample.compute");
+            instance.copyChannelCS = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "RenderPipelineResources/CopyChannel.compute");
 
             instance.clearDispatchIndirectShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/cleardispatchindirect.compute");
             instance.buildDispatchIndirectShader = UnityEditor.AssetDatabase.LoadAssetAtPath<ComputeShader>(HDRenderPipelinePath + "Lighting/TilePass/builddispatchindirect.compute");
         public Shader screenSpaceAmbientOcclusionShader;
         public ComputeShader subsurfaceScatteringCS;
         public ComputeShader volumetricLightingCS;
+        public ComputeShader gaussianPyramidCS;
+        public ComputeShader depthPyramidCS;
+        public ComputeShader copyChannelCS;
 
         // Lighting tile pass resources
         public ComputeShader clearDispatchIndirectShader;
         public Shader GGXConvolve;
 
         public Shader skyboxCubemap;
+
+        public int copyChannelKernel_xyzw2x { get; private set; }
+
+        public void OnEnable()
+        {
+            copyChannelKernel_xyzw2x = -1;
+
+            if (copyChannelCS != null)
+            {
+                copyChannelKernel_xyzw2x = copyChannelCS.FindKernel("KSampleCopy4_1_x");
+            }
+        }
     }
 }

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

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+  m_EnableInstancingVariants: 0
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SampleScenes/HDTest/GraphicTest/Scripts.meta

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SampleScenes/HDTest/TransparencyTest.unity.meta

+fileFormatVersion: 2
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+  userData: 
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ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/CopyChannel.compute

+#include "../../Core/ShaderLibrary/Common.hlsl"
+
+#define SOURCE(n) _Source##n
+#define RESULT(n) _Result##n
+#define SOURCE_DECLARATION(n) Texture2D<float##n> SOURCE(n)
+#define RESULT_DECLARATION(n) RWTexture2D<float##n> RESULT(n)
+
+SOURCE_DECLARATION(1);
+SOURCE_DECLARATION(2);
+SOURCE_DECLARATION(3);
+SOURCE_DECLARATION(4);
+RESULT_DECLARATION(1);
+RESULT_DECLARATION(2);
+RESULT_DECLARATION(3);
+RESULT_DECLARATION(4);
+
+SamplerState sampler_LinearClamp;
+
+CBUFFER_START(cb)
+    float4 _Size;
+CBUFFER_END
+
+#define KERNEL_SAMPLECOPY(sourceN, resultN, subscript) [numthreads(8, 8, 1)]\
+void KSampleCopy##sourceN##_##resultN##_##subscript(uint2 dispatchThreadId : SV_DispatchThreadID)\
+{\
+    RESULT(resultN)[dispatchThreadId] = SOURCE(sourceN).SampleLevel(sampler_LinearClamp, float2(dispatchThreadId) * _Size.zw, 0.0).subscript;\
+}
+
+// Source R
+#pragma kernel KSampleCopy1_1_x
+KERNEL_SAMPLECOPY(1, 1, x);
+
+// Source RG
+// Result R
+#pragma kernel KSampleCopy2_1_x
+KERNEL_SAMPLECOPY(2, 1, x);
+#pragma kernel KSampleCopy2_1_y
+KERNEL_SAMPLECOPY(2, 1, y);
+// Result RG
+#pragma kernel KSampleCopy2_2_xx
+KERNEL_SAMPLECOPY(2, 2, xx);
+#pragma kernel KSampleCopy2_2_xy
+KERNEL_SAMPLECOPY(2, 2, xy);
+#pragma kernel KSampleCopy2_2_yx
+KERNEL_SAMPLECOPY(2, 2, yx);
+#pragma kernel KSampleCopy2_2_yy
+KERNEL_SAMPLECOPY(2, 2, yy);
+
+// Source RGBA
+// Result R
+#pragma kernel KSampleCopy4_1_x
+KERNEL_SAMPLECOPY(4, 1, x);
+#pragma kernel KSampleCopy4_1_y
+KERNEL_SAMPLECOPY(4, 1, y);
+#pragma kernel KSampleCopy4_1_z
+KERNEL_SAMPLECOPY(4, 1, z);
+#pragma kernel KSampleCopy4_1_w
+KERNEL_SAMPLECOPY(4, 1, w);

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/CopyChannel.compute.meta

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ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/DepthDownsample.compute

+#include "../../Core/ShaderLibrary/Common.hlsl"
+
+Texture2D<float> _Source;
+RWTexture2D<float> _Result;
+
+SamplerState sampler_LinearClamp;
+
+CBUFFER_START(cb)
+    float4 _Size;
+CBUFFER_END
+
+#pragma kernel KMain
+[numthreads(8, 8, 1)]
+void KMain(uint2 groupId : SV_GroupID, uint2 groupThreadId : SV_GroupThreadID, uint2 dispatchThreadId : SV_DispatchThreadID)
+{
+    // Upper-left pixel coordinate of quad that this thread will read
+    int2 threadUL = dispatchThreadId;
+
+    // Downsample the block
+    float2 offset = float2(threadUL);
+    float p00 = _Source.SampleLevel(sampler_LinearClamp, (offset                   ) * _Size.zw, 0.0).x;
+    float p10 = _Source.SampleLevel(sampler_LinearClamp, (offset + float2(1.0, 0.0)) * _Size.zw, 0.0).x;
+    float p01 = _Source.SampleLevel(sampler_LinearClamp, (offset + float2(0.0, 1.0)) * _Size.zw, 0.0).x;
+    float p11 = _Source.SampleLevel(sampler_LinearClamp, (offset + float2(1.0, 1.0)) * _Size.zw, 0.0).x;
+
+    float depth = min(min(min(p00, p01), p10), p11);
+
+    // Write to the final target
+    _Result[dispatchThreadId] = depth;
+}

ScriptableRenderPipeline/HDRenderPipeline/RenderPipelineResources/DepthDownsample.compute.meta

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SampleScenes/HDTest/GraphicTest/Scripts/MaterialPlacer.cs

+using UnityEngine;
+
+[ExecuteInEditMode]
+public class MaterialPlacer : MonoBehaviour
+{
+    [SerializeField]
+    Renderer m_Prefab;
+
+    [SerializeField]
+    int m_Rows = 2;
+
+    [SerializeField]
+    int m_Cols = 2;
+
+    [SerializeField]
+    Vector3 m_Size = Vector3.one;
+
+    [SerializeField]
+    string m_FloatName;
+
+    [SerializeField]
+    float m_FromValue = 0;
+
+    [SerializeField]
+    float m_ToValue = 1;
+
+    int m_LastHash = 0;
+
+    void Update()
+    {
+        int hash = CalculateParameterHash();
+        if (hash != m_LastHash)
+        {
+            m_LastHash = hash;
+            Regenerate();
+        }
+    }
+
+    [ContextMenu("Regenerate")]
+    void Regenerate()
+    {
+        DestroyAll();
+        if (m_LastHash != 0)
+            Generate();
+    }
+
+    void Generate()
+    {
+        var tr = transform;
+        var count = (float)(m_Cols * m_Rows - 1);
+        var _1_count = 1f / count;
+        var valueOffset = m_FromValue;
+        var valueStep = (m_ToValue - m_FromValue) * _1_count;
+
+        var positionOffset = -m_Size;
+        var positionStep = new Vector3(2f * m_Size.x / (m_Rows - 1f), 2f * m_Size.y / (m_Cols - 1f), 0);
+
+        for (var j = 0; j < m_Cols; j++)
+        {
+            for (var i = 0; i < m_Rows; i++)
+            {
+                var instance = Instantiate(m_Prefab);
+                var itr = instance.transform;
+                itr.SetParent(tr, false);
+                itr.localPosition = Vector3.Scale(positionStep, new Vector3(i, j, 0)) + positionOffset;
+                var mat = Instantiate(instance.sharedMaterial);
+                instance.material = mat;
+                var value = valueOffset + valueStep * (i + j * m_Rows);
+                instance.name = string.Format("{0} {1}", m_Prefab.name, value.ToString("F2"));
+                mat.SetFloat(m_FloatName, value);
+            }
+        }
+    }
+
+    void DestroyAll()
+    {
+        var tr = transform;
+        var childCount = tr.childCount;
+        for (var i = childCount - 1; i >= 0; --i)
+        {
+            var child = tr.GetChild(i);
+            var renderer = child.GetComponent<Renderer>();
+
+            if (renderer != null)
+            {
+                var mat = renderer.sharedMaterial;
+                DestroyImmediate(mat, false);
+            }
+
+            DestroyImmediate(child.gameObject, false);
+        }
+    }
+
+    int CalculateParameterHash()
+    {
+        if (m_Prefab == null || string.IsNullOrEmpty(m_FloatName))
+            return 0;
+
+        return m_Prefab.GetInstanceID()
+            ^ m_Rows.GetHashCode()
+            ^ m_Cols.GetHashCode()
+            ^ m_Size.GetHashCode()
+            ^ m_FloatName.GetHashCode()
+            ^ m_FromValue.GetHashCode()
+            ^ m_ToValue.GetHashCode();
+    }
+
+    void OnValidate()
+    {
+        m_Rows = Mathf.Max(2, m_Rows);
+        m_Cols = Mathf.Max(2, m_Cols);
+        m_Size = Vector3.Max(Vector3.zero, m_Size);
+    }
+}

SampleScenes/HDTest/GraphicTest/Scripts/MaterialPlacer.cs.meta

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