Merge pull request #80 from Chman/postfx-hack

Temporary post-processing stack for artists

Assets/ScriptableRenderLoop/HDRenderPipeline/Editor/HDRenderPipelineInspector.cs

 
             public readonly GUIContent displayOpaqueObjects = new GUIContent("Display Opaque Objects", "Toggle opaque objects rendering on and off.");
             public readonly GUIContent displayTransparentObjects = new GUIContent("Display Transparent Objects", "Toggle transparent objects rendering on and off.");
-            public readonly GUIContent enableTonemap = new GUIContent("Enable Tonemap");
-            public readonly GUIContent exposure = new GUIContent("Exposure");
 
             public readonly GUIContent useForwardRenderingOnly = new GUIContent("Use Forward Rendering Only");
             public readonly GUIContent useDepthPrepass = new GUIContent("Use Depth Prepass");
             debugParameters.debugViewMaterial = EditorGUILayout.IntPopup(styles.debugViewMaterial, (int)debugParameters.debugViewMaterial, styles.debugViewMaterialStrings, styles.debugViewMaterialValues);
 
             EditorGUILayout.Space();
-            debugParameters.enableTonemap = EditorGUILayout.Toggle(styles.enableTonemap, debugParameters.enableTonemap);
-            debugParameters.exposure = Mathf.Max(Mathf.Min(EditorGUILayout.FloatField(styles.exposure, debugParameters.exposure), k_MaxExposure), -k_MaxExposure);
-
-            EditorGUILayout.Space();
-            
+
             if (EditorGUI.EndChangeCheck())
             {
                 EditorUtility.SetDirty(renderContext); // Repaint

Assets/ScriptableRenderLoop/HDRenderPipeline/Editor/HDRenderPipelineMenuItems.cs

-using System.Collections;
-using System.Collections.Generic;
-using UnityEditor;
-
 using UnityEngine.Experimental.Rendering.HDPipeline;
 
 namespace UnityEditor.Experimental.Rendering.HDPipeline
-        [UnityEditor.MenuItem("HDRenderPipeline/Create Scene Settings")]
+        [MenuItem("HDRenderPipeline/Create Scene Settings")]
-            CommonSettings[] settings = Object.FindObjectsOfType(typeof(CommonSettings)) as CommonSettings[];
+            CommonSettings[] settings = Object.FindObjectsOfType<CommonSettings>();
-                GameObject go = new GameObject();
-                go.name = "SceneSettings";
-                go.AddComponent(typeof(CommonSettings));
+                GameObject go = new GameObject { name = "SceneSettings" };
+                go.AddComponent<CommonSettings>();
+                go.AddComponent<PostProcessing>();
             }
             else
             {
 
-        [UnityEditor.MenuItem("HDRenderPipeline/Synchronize all Layered materials")]
+        [MenuItem("HDRenderPipeline/Synchronize all Layered materials")]
         static void SynchronizeAllLayeredMaterial()
         {
             Object[] materials = Resources.FindObjectsOfTypeAll<Material>();

Assets/ScriptableRenderLoop/HDRenderPipeline/HDRenderPipeline.cs

             public bool useForwardRenderingOnly = false; // TODO: Currently there is no way to strip the extra forward shaders generated by the shaders compiler, so we can switch dynamically.
             public bool useDepthPrepass = false;
             public bool useDistortion = true;
-
-            public bool enableTonemap = true;
-            public float exposure = 0;
         }
 
         DebugParameters m_DebugParameters = new DebugParameters();
         }
 
         // Various set of material use in render loop
-        Material m_FinalPassMaterial;
         Material m_DebugViewMaterialGBuffer;
 
         // Various buffer
 
             m_SkyManager.Build();
 
-            m_FinalPassMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/FinalPass");
             m_DebugViewMaterialGBuffer = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/DebugViewMaterialGBuffer");
 
             m_ShadowPass = new ShadowRenderPass(m_ShadowSettings);
             m_lightLoop.Cleanup();
             m_LitRenderLoop.Cleanup();
  
-            Utilities.Destroy(m_FinalPassMaterial);
             Utilities.Destroy(m_DebugViewMaterialGBuffer);
 
             m_SkyManager.Cleanup();
             }
         }
 
-        void FinalPass(ScriptableRenderContext renderContext)
+        void FinalPass(Camera camera, ScriptableRenderContext renderContext)
-                // Those could be tweakable for the neutral tonemapper, but in the case of the LookDev we don't need that
-                const float blackIn = 0.02f;
-                const float whiteIn = 10.0f;
-                const float blackOut = 0.0f;
-                const float whiteOut = 10.0f;
-                const float whiteLevel = 5.3f;
-                const float whiteClip = 10.0f;
-                const float dialUnits = 20.0f;
-                const float halfDialUnits = dialUnits * 0.5f;
-
-                // converting from artist dial units to easy shader-lerps (0-1)
-                var tonemapCoeff1 = new Vector4((blackIn * dialUnits) + 1.0f, (blackOut * halfDialUnits) + 1.0f, (whiteIn / dialUnits), (1.0f - (whiteOut / dialUnits)));
-                var tonemapCoeff2 = new Vector4(0.0f, 0.0f, whiteLevel, whiteClip / halfDialUnits);
+                // All of this is temporary, sub-optimal and quickly hacked together but is necessary
+                // for artists to do lighting work until the fully-featured framework is ready
-                m_FinalPassMaterial.SetVector("_ToneMapCoeffs1", tonemapCoeff1);
-                m_FinalPassMaterial.SetVector("_ToneMapCoeffs2", tonemapCoeff2);
+                var localPostProcess = camera.GetComponent<PostProcessing>();
+                var globalPostProcess = commonSettings == null
+                    ? null
+                    : commonSettings.GetComponent<PostProcessing>();
-                m_FinalPassMaterial.SetFloat("_EnableToneMap", debugParameters.enableTonemap ? 1.0f : 0.0f);
-                m_FinalPassMaterial.SetFloat("_Exposure", debugParameters.exposure);
+                bool localActive = localPostProcess != null && localPostProcess.enabled;
+                bool globalActive = globalPostProcess != null && globalPostProcess.enabled;
-                var cmd = new CommandBuffer { name = "" };
+                if (!localActive && !globalActive)
+                {
+                    var cmd = new CommandBuffer { name = "" };
+                    cmd.Blit(m_CameraColorBufferRT, BuiltinRenderTextureType.CameraTarget);
+                    renderContext.ExecuteCommandBuffer(cmd);
+                    cmd.Dispose();
+                    return;
+                }
-                // Resolve our HDR texture to CameraTarget.
-                cmd.Blit(m_CameraColorBufferRT, BuiltinRenderTextureType.CameraTarget, m_FinalPassMaterial, 0);
-                renderContext.ExecuteCommandBuffer(cmd);
-                cmd.Dispose();
+                var target = localActive ? localPostProcess : globalPostProcess;
+                target.Render(camera, renderContext, m_CameraColorBufferRT, BuiltinRenderTextureType.CameraTarget);
             }
         }
 
                     // Instead we chose to apply distortion at the end after we cumulate distortion vector and desired blurriness. This
                     RenderDistortion(cullResults, camera, renderContext);
 
-                    FinalPass(renderContext);
+                    FinalPass(camera, renderContext);
                 }
 
                 // bind depth surface for editor grid/gizmo/selection rendering
 
                 renderContext.Submit();
             }
-            
-            // Post effects
         }
     }
 }

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/FinalPass.shader

-// Final compositing pass, just does gamma correction for now.
-
-        _ToneMapCoeffs1("Parameters for neutral tonemap", Vector) = (0.0, 0.0, 0.0, 0.0)
-        _ToneMapCoeffs2("Parameters for neutral tonemap", Vector) = (0.0, 0.0, 0.0, 0.0)
-        _Exposure("Exposure", Range(-32.0, 32.0)) = 0
-        [ToggleOff] _EnableToneMap("Enable Tone Map", Float) = 0
-    SubShader {
-        Pass {
-            ZTest Always Cull Off ZWrite Off
+    HLSLINCLUDE
-            HLSLPROGRAM
-            #pragma vertex Vert
-            #pragma fragment Frag
-            #pragma target 5.0
+        #pragma target 5.0
+        #include "Common.hlsl"
+        #include "Assets/ScriptableRenderLoop/HDRenderPipeline/ShaderVariables.hlsl"
+        #include "ColorGrading.hlsl"
-            #include "Common.hlsl"
-            #include "Color.hlsl"
-            #include "Assets/ScriptableRenderLoop/HDRenderPipeline/ShaderVariables.hlsl"
+        TEXTURE2D(_MainTex);
+        SAMPLER2D(sampler_MainTex);
-  			TEXTURE2D(_MainTex);
-			SAMPLER2D(sampler_MainTex);
+        TEXTURE2D(_AutoExposure);
+        SAMPLER2D(sampler_AutoExposure);
-            float4      _ToneMapCoeffs1;
-            float4      _ToneMapCoeffs2;
+        TEXTURE2D(_LogLut);
+        SAMPLER2D(sampler_LogLut);
-            #define InBlack         _ToneMapCoeffs1.x
-            #define OutBlack        _ToneMapCoeffs1.y
-            #define InWhite         _ToneMapCoeffs1.z
-            #define OutWhite        _ToneMapCoeffs1.w
-            #define WhiteLevel      _ToneMapCoeffs2.z
-            #define WhiteClip       _ToneMapCoeffs2.w
+        float4 _LogLut_Params;
-            float _Exposure;
-            float _EnableToneMap;
+        float _Exposure;
-            struct Attributes 
-            {
-                float3 vertex : POSITION;
-                float2 texcoord : TEXCOORD0;
-            };
+        float4 _NeutralTonemapperParams1;
+        float4 _NeutralTonemapperParams2;
-            struct Varyings 
-            {
-                float4 vertex : SV_POSITION;
-                float2 texcoord : TEXCOORD0;
-            };
+        struct Attributes 
+        {
+            float3 vertex : POSITION;
+            float2 texcoord : TEXCOORD0;
+        };
-            Varyings Vert(Attributes input)
-            {
-                Varyings output;
-                output.vertex = TransformWorldToHClip(input.vertex);
-                output.texcoord = input.texcoord.xy;
-                return output;
-            }
+        struct Varyings 
+        {
+            float4 vertex : SV_POSITION;
+            float2 texcoord : TEXCOORD0;
+        };
-            float3 evalCurve(float3 x, float A, float B, float C, float D, float E, float F)
-            {
-                return ((x*(A*x + C*B) + D*E) / (x*(A*x + B) + D*F)) - E / F;
-            }
+        Varyings Vert(Attributes input)
+        {
+            Varyings output;
+            output.vertex = TransformWorldToHClip(input.vertex);
+            output.texcoord = input.texcoord.xy;
+            return output;
+        }
-            float3 applyTonemapFilmicAD(float3 linearColor)
-            {
-                float blackRatio = InBlack / OutBlack;
-                float whiteRatio = InWhite / OutWhite;
+        // Neutral tonemapping (Hable/Hejl/Frostbite)
+        // Input is linear RGB
+        float3 NeutralCurve(float3 x, float a, float b, float c, float d, float e, float f)
+        {
+            return ((x * (a * x + c * b) + d * e) / (x * (a * x + b) + d * f)) - e / f;
+        }
+
+        float3 NeutralTonemap(float3 x, float4 params1, float4 params2)
+        {
+            // ACES supports negative color values and WILL output negative values when coming from ACES or ACEScg
+            // Make sure negative channels are clamped to 0.0 as this neutral tonemapper can't deal with them properly
+            x = max((0.0).xxx, x);
+
+            // Tonemap
+            float a = params1.x;
+            float b = params1.y;
+            float c = params1.z;
+            float d = params1.w;
+            float e = params2.x;
+            float f = params2.y;
+            float whiteLevel = params2.z;
+            float whiteClip = params2.w;
-                // blend tunable coefficients
-                float B = lerp(0.57, 0.37, blackRatio);
-                float C = lerp(0.01, 0.24, whiteRatio);
-                float D = lerp(0.02, 0.20, blackRatio);
+            float3 whiteScale = (1.0).xxx / NeutralCurve(whiteLevel, a, b, c, d, e, f);
+            x = NeutralCurve(x * whiteScale, a, b, c, d, e, f);
+            x *= whiteScale;
-                // constants
-                float A = 0.2;
-                float E = 0.02;
-                float F = 0.30;
+            // Post-curve white point adjustment
+            x /= whiteClip.xxx;
-                // eval and correct for white point
-                float3 whiteScale = 1.0f / evalCurve(WhiteLevel, A, B, C, D, E, F);
-                float3 curr = evalCurve(linearColor * whiteScale, A, B, C, D, E, F);
+            return x;
+        }
-                return curr * whiteScale;
-            }
+        float4 Frag(Varyings input) : SV_Target
+        {
+            float4 color = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.texcoord);
-            float3 remapWhite(float3 inPixel, float whitePt)
+            #if EYE_ADAPTATION
-                //  var breakout for readability
-                const float inBlack = 0;
-                const float outBlack = 0;
-                float inWhite = whitePt;
-                const float outWhite = 1;
-
-                // remap input range to output range
-                float3 outPixel = ((inPixel.rgb) - inBlack.xxx) / (inWhite.xxx - inBlack.xxx) * (outWhite.xxx - outBlack.xxx) + outBlack.xxx;
-                return (outPixel.rgb);
+                float autoExposure = SAMPLE_TEXTURE2D(_AutoExposure, sampler_AutoExposure, input.texcoord).r;
+                color *= autoExposure;
+            #endif
-            float3 NeutralTonemap(float3 x)
+            color.rgb *= _Exposure; // Exposure is in ev units (or 'stops'), precomputed CPU-side
+
+            #if NEUTRAL_GRADING
-                float3 finalColor = applyTonemapFilmicAD(x); // curve (dynamic coeffs differ per level)
-                finalColor = remapWhite(finalColor, WhiteClip); // post-curve white point adjustment
-                finalColor = saturate(finalColor);
-                return finalColor;
+                color.rgb = NeutralTonemap(color.rgb, _NeutralTonemapperParams1, _NeutralTonemapperParams2);
+            #elif CUSTOM_GRADING
+            {
+                float3 uvw = saturate(LinearToLogC(color));
-            float3 ApplyToneMap(float3 color)
+                // Strip lut format where `height = sqrt(width)`
+                uvw.z *= _LogLut_Params.z;
+                half shift = floor(uvw.z);
+                uvw.xy = uvw.xy * _LogLut_Params.z * _LogLut_Params.xy + _LogLut_Params.xy * 0.5;
+                uvw.x += shift * _LogLut_Params.y;
+                uvw.xyz = lerp(
+                    SAMPLE_TEXTURE2D(_LogLut, sampler_LogLut, uvw.xy).rgb,
+                    SAMPLE_TEXTURE2D(_LogLut, sampler_LogLut, uvw.xy + half2(_LogLut_Params.y, 0)).rgb,
+                    uvw.z - shift
+                );
+
+                color.rgb = uvw;
+            }
+            #else
-                if (_EnableToneMap > 0.0)
-                {
-                    return NeutralTonemap(color);
-                }
-                else
-                {
-                    return saturate(color);
-                }
+                color = saturate(color);
+            #endif
-            float4 Frag(Varyings input) : SV_Target
-            {
-                float4 c = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.texcoord);
-                // Gamma correction
+            return color;
+        }
-                // TODO: Currenlt in the editor there a an additional pass were the result is copyed in a render target RGBA8_sRGB.
-                // So we must not correct the sRGB here else it will be done two time.
-                // To fix!
+    ENDHLSL
-                c.rgb = ApplyToneMap(c.rgb * exp2(_Exposure));
+    SubShader
+    {
+        Cull Off ZWrite Off ZTest Always
-                // return LinearToSRGB(c);
-                return c;
+        Pass
+        {
+            HLSLPROGRAM
+                #pragma vertex Vert
+                #pragma fragment Frag
+                #pragma multi_compile __ NEUTRAL_GRADING CUSTOM_GRADING
+                #pragma multi_compile __ EYE_ADAPTATION
-            }
-
+
     Fallback Off
 }

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Editor.meta

+fileFormatVersion: 2
+guid: 5d4f8c766010cda4b97dbd7bb0905215
+folderAsset: yes
+timeCreated: 1483612561
+licenseType: Pro
+DefaultImporter:
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/PostProcessing.cs

+using System;
+using UnityEngine.Rendering;
+
+// TEMPORARY, minimalist post-processing stack until the fully-featured framework is ready
+
+namespace UnityEngine.Experimental.Rendering.HDPipeline
+{
+    using GradingType = PostProcessing.ColorGradingSettings.GradingType;
+    using EyeAdaptationType = PostProcessing.EyeAdaptationSettings.EyeAdaptationType;
+
+    [ExecuteInEditMode]
+    public sealed class PostProcessing : MonoBehaviour
+    {
+        [Serializable]
+        public sealed class ColorGradingSettings
+        {
+            public enum GradingType
+            {
+                None,
+                Neutral,
+                Custom
+            }
+
+            public GradingType type = GradingType.None;
+            public float exposure = 0f;
+
+            public Texture logLut = null;
+
+            [Range(-0.10f,  0.1f)] public float neutralBlackIn    = 0.02f;
+            [Range( 1.00f, 20.0f)] public float neutralWhiteIn    = 10f;
+            [Range(-0.09f,  0.1f)] public float neutralBlackOut   = 0f;
+            [Range( 1.00f, 19.0f)] public float neutralWhiteOut   = 10f;
+            [Range( 0.10f, 20.0f)] public float neutralWhiteLevel = 5.3f;
+            [Range( 1.00f, 10.0f)] public float neutralWhiteClip  = 10f;
+        }
+
+        [Serializable]
+        public sealed class EyeAdaptationSettings
+        {
+            public enum EyeAdaptationType
+            {
+                Progressive,
+                Fixed
+            }
+
+            public bool enabled = false;
+            public bool showDebugHistogramInGameView = true;
+
+            [Range(1f, 99f)] public float lowPercent = 65f;
+            [Range(1f, 99f)] public float highPercent = 95f;
+
+            public float minLuminance = 0.03f;
+            public float maxLuminance = 2f;
+            public float exposureCompensation = 0.5f;
+
+            public EyeAdaptationType adaptationType = EyeAdaptationType.Progressive;
+
+            public float speedUp = 2f;
+            public float speedDown = 1f;
+
+            [Range(-16, -1)] public int logMin = -8;
+            [Range(  1, 16)] public int logMax = 4;
+        }
+
+        public EyeAdaptationSettings eyeAdaptation = new EyeAdaptationSettings();
+        public ColorGradingSettings colorGrading = new ColorGradingSettings();
+
+        Material m_EyeAdaptationMaterial;
+        Material m_FinalPassMaterial;
+
+        ComputeShader m_EyeCompute;
+        ComputeBuffer m_HistogramBuffer;
+
+        readonly RenderTexture[] m_AutoExposurePool = new RenderTexture[2];
+        int m_AutoExposurePingPing;
+        RenderTexture m_CurrentAutoExposure;
+        RenderTexture m_DebugHistogram = null;
+
+        static uint[] s_EmptyHistogramBuffer = new uint[k_HistogramBins];
+
+        bool m_FirstFrame = true;
+
+        // Don't forget to update 'EyeAdaptation.cginc' if you change these values !
+        const int k_HistogramBins = 64;
+        const int k_HistogramThreadX = 16;
+        const int k_HistogramThreadY = 16;
+
+        void OnEnable()
+        {
+            m_FinalPassMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/FinalPass");
+            m_EyeAdaptationMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/EyeAdaptation");
+
+            m_EyeCompute = Resources.Load<ComputeShader>("EyeHistogram");
+            m_HistogramBuffer = new ComputeBuffer(k_HistogramBins, sizeof(uint));
+
+            m_AutoExposurePool[0] = new RenderTexture(1, 1, 0, RenderTextureFormat.RFloat);
+            m_AutoExposurePool[1] = new RenderTexture(1, 1, 0, RenderTextureFormat.RFloat);
+
+            m_FirstFrame = true;
+        }
+
+        void OnDisable()
+        {
+            Utilities.Destroy(m_EyeAdaptationMaterial);
+            Utilities.Destroy(m_FinalPassMaterial);
+
+            foreach (var rt in m_AutoExposurePool)
+                Utilities.Destroy(rt);
+
+            Utilities.Destroy(m_DebugHistogram);
+            Utilities.SafeRelease(m_HistogramBuffer);
+        }
+
+        public void Render(Camera camera, ScriptableRenderContext context, RenderTargetIdentifier source, RenderTargetIdentifier destination)
+        {
+            m_FinalPassMaterial.shaderKeywords = null;
+
+            var cmd = new CommandBuffer { name = "Final Pass" };
+
+            if (eyeAdaptation.enabled)
+            {
+                int tempRt = Shader.PropertyToID("_Source");
+
+                // Downscale the framebuffer, we don't need an absolute precision for auto exposure
+                // and it helps making it more stable - should be using a previously downscaled pass
+                var scaleOffsetRes = GetHistogramScaleOffsetRes(camera);
+
+                cmd.GetTemporaryRT(tempRt, (int)scaleOffsetRes.z, (int)scaleOffsetRes.w, 0, FilterMode.Bilinear, RenderTextureFormat.ARGBHalf);
+                cmd.Blit(source, tempRt);
+
+                // Clears the buffer on every frame as we use it to accumulate luminance values on each frame
+                m_HistogramBuffer.SetData(s_EmptyHistogramBuffer);
+
+                // Gets a log histogram
+                int kernel = m_EyeCompute.FindKernel("KEyeHistogram");
+
+                cmd.SetComputeBufferParam(m_EyeCompute, kernel, "_Histogram", m_HistogramBuffer);
+                cmd.SetComputeTextureParam(m_EyeCompute, kernel, "_Source", tempRt);
+                cmd.SetComputeVectorParam(m_EyeCompute, "_ScaleOffsetRes", scaleOffsetRes);
+                cmd.DispatchCompute(m_EyeCompute, kernel, Mathf.CeilToInt(scaleOffsetRes.z / (float)k_HistogramThreadX), Mathf.CeilToInt(scaleOffsetRes.w / (float)k_HistogramThreadY), 1);
+
+                // Cleanup
+                cmd.ReleaseTemporaryRT(tempRt);
+
+                // Make sure filtering values are correct to avoid apocalyptic consequences
+                const float kMinDelta = 1e-2f;
+                eyeAdaptation.highPercent = Mathf.Clamp(eyeAdaptation.highPercent, 1f + kMinDelta, 99f);
+                eyeAdaptation.lowPercent = Mathf.Clamp(eyeAdaptation.lowPercent, 1f, eyeAdaptation.highPercent - kMinDelta);
+
+                // Compute auto exposure
+                m_EyeAdaptationMaterial.SetBuffer("_Histogram", m_HistogramBuffer);
+                m_EyeAdaptationMaterial.SetVector("_Params", new Vector4(eyeAdaptation.lowPercent * 0.01f, eyeAdaptation.highPercent * 0.01f, eyeAdaptation.minLuminance, eyeAdaptation.maxLuminance));
+                m_EyeAdaptationMaterial.SetVector("_Speed", new Vector2(eyeAdaptation.speedDown, eyeAdaptation.speedUp));
+                m_EyeAdaptationMaterial.SetVector("_ScaleOffsetRes", scaleOffsetRes);
+                m_EyeAdaptationMaterial.SetFloat("_ExposureCompensation", eyeAdaptation.exposureCompensation);
+
+                if (m_FirstFrame || !Application.isPlaying)
+                {
+                    // We don't want eye adaptation when not in play mode because the GameView isn't
+                    // animated, thus making it harder to tweak. Just use the final audo exposure value.
+                    m_CurrentAutoExposure = m_AutoExposurePool[0];
+                    cmd.Blit(null, m_CurrentAutoExposure, m_EyeAdaptationMaterial, (int)EyeAdaptationType.Fixed);
+
+                    // Copy current exposure to the other pingpong target on first frame to avoid adapting from black
+                    cmd.Blit(m_AutoExposurePool[0], m_AutoExposurePool[1]);
+                } else
+                {
+                    int pp = m_AutoExposurePingPing;
+                    var src = m_AutoExposurePool[++pp % 2];
+                    var dst = m_AutoExposurePool[++pp % 2];
+                    cmd.Blit(src, dst, m_EyeAdaptationMaterial, (int)eyeAdaptation.adaptationType);
+                    m_AutoExposurePingPing = ++pp % 2;
+                    m_CurrentAutoExposure = dst;
+                }
+
+                m_FinalPassMaterial.EnableKeyword("EYE_ADAPTATION");
+                m_FinalPassMaterial.SetTexture("_AutoExposure", m_CurrentAutoExposure);
+
+                // Debug histogram visualization
+                if (eyeAdaptation.showDebugHistogramInGameView)
+                {
+                    if (m_DebugHistogram == null || !m_DebugHistogram.IsCreated())
+                    {
+                        m_DebugHistogram = new RenderTexture(256, 128, 0, RenderTextureFormat.ARGB32)
+                        {
+                            filterMode = FilterMode.Point,
+                            wrapMode = TextureWrapMode.Clamp
+                        };
+                    }
+
+                    m_EyeAdaptationMaterial.SetFloat("_DebugWidth", m_DebugHistogram.width);
+                    cmd.Blit(null, m_DebugHistogram, m_EyeAdaptationMaterial, 2);
+                }
+
+                m_FirstFrame = false;
+            }
+
+            float ev = Mathf.Exp(colorGrading.exposure * 0.6931471805599453f);
+            m_FinalPassMaterial.SetFloat("_Exposure", ev);
+
+            if (colorGrading.type == GradingType.Neutral)
+            {
+                const float kScaleFactor = 20f;
+                const float kScaleFactorHalf = kScaleFactor * 0.5f;
+
+                float inBlack = colorGrading.neutralBlackIn * kScaleFactor + 1f;
+                float outBlack = colorGrading.neutralBlackOut * kScaleFactorHalf + 1f;
+                float inWhite = colorGrading.neutralWhiteIn / kScaleFactor;
+                float outWhite = 1f - colorGrading.neutralWhiteOut / kScaleFactor;
+                float blackRatio = inBlack / outBlack;
+                float whiteRatio = inWhite / outWhite;
+
+                const float a = 0.2f;
+                float b = Mathf.Max(0f, Mathf.LerpUnclamped(0.57f, 0.37f, blackRatio));
+                float c = Mathf.LerpUnclamped(0.01f, 0.24f, whiteRatio);
+                float d = Mathf.Max(0f, Mathf.LerpUnclamped(0.02f, 0.20f, blackRatio));
+                const float e = 0.02f;
+                const float f = 0.30f;
+
+                m_FinalPassMaterial.SetVector("_NeutralTonemapperParams1", new Vector4(a, b, c, d));
+                m_FinalPassMaterial.SetVector("_NeutralTonemapperParams2", new Vector4(e, f, colorGrading.neutralWhiteLevel, colorGrading.neutralWhiteClip / kScaleFactorHalf));
+                m_FinalPassMaterial.EnableKeyword("NEUTRAL_GRADING");
+            }
+            else if (colorGrading.type == GradingType.Custom)
+            {
+                if (colorGrading.logLut != null)
+                {
+                    var lut = colorGrading.logLut;
+                    m_FinalPassMaterial.SetTexture("_LogLut", lut);
+                    m_FinalPassMaterial.SetVector("_LogLut_Params", new Vector3(1f / lut.width, 1f / lut.height, lut.height - 1f));
+                    m_FinalPassMaterial.EnableKeyword("CUSTOM_GRADING");
+                }
+            }
+
+            cmd.Blit(source, destination, m_FinalPassMaterial, 0);
+            context.ExecuteCommandBuffer(cmd);
+            cmd.Dispose();
+        }
+
+        Vector4 GetHistogramScaleOffsetRes(Camera camera)
+        {
+            float diff = eyeAdaptation.logMax - eyeAdaptation.logMin;
+            float scale = 1f / diff;
+            float offset = -eyeAdaptation.logMin * scale;
+            return new Vector4(scale, offset, Mathf.Floor(camera.pixelWidth / 2f), Mathf.Floor(camera.pixelHeight / 2f));
+        }
+
+        void OnGUI()
+        {
+            if (!eyeAdaptation.enabled || !eyeAdaptation.showDebugHistogramInGameView || m_DebugHistogram == null || !m_DebugHistogram.IsCreated())
+                return;
+
+            var rect = new Rect(8f, 8f, m_DebugHistogram.width, m_DebugHistogram.height);
+            GUI.DrawTexture(rect, m_DebugHistogram);
+        }
+    }
+}

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/PostProcessing.cs.meta

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+guid: aaa10d337b215d94dbc0ce5467cdc79a
+timeCreated: 1483612023
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Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/ColorGrading.hlsl

+#ifndef UNITY_COLOR_GRADING
+#define UNITY_COLOR_GRADING
+
+// Set to 1 to use more precise but more expensive log/linear conversions. I haven't found a proper
+// use case for the high precision version yet so I'm leaving this to 0.
+#define COLOR_GRADING_PRECISE_LOG 0
+
+//
+// Alexa LogC converters (El 1000)
+// See http://www.vocas.nl/webfm_send/964
+// It's a good fit to store HDR values in log as the range is pretty wide (1 maps to ~58.85666) and
+// is quick enough to compute.
+//
+struct ParamsLogC
+{
+    float cut;
+    float a, b, c, d, e, f;
+};
+
+static const ParamsLogC LogC =
+{
+    0.011361, // cut
+    5.555556, // a
+    0.047996, // b
+    0.244161, // c
+    0.386036, // d
+    5.301883, // e
+    0.092819  // f
+};
+
+half LinearToLogC_Precise(half x)
+{
+    float o;
+    if (x > LogC.cut)
+        o = LogC.c * log10(LogC.a * x + LogC.b) + LogC.d;
+    else
+        o = LogC.e * x + LogC.f;
+    return o;
+}
+
+float3 LinearToLogC(float3 x)
+{
+#if COLOR_GRADING_PRECISE_LOG
+    return float3(
+        LinearToLogC_Precise(x.x),
+        LinearToLogC_Precise(x.y),
+        LinearToLogC_Precise(x.z)
+    );
+#else
+    return LogC.c * log10(LogC.a * x + LogC.b) + LogC.d;
+#endif
+}
+
+float LogCToLinear_Precise(float x)
+{
+    float o;
+    if (x > LogC.e * LogC.cut + LogC.f)
+        o = (pow(10.0, (x - LogC.d) / LogC.c) - LogC.b) / LogC.a;
+    else
+        o = (x - LogC.f) / LogC.e;
+    return o;
+}
+
+float3 LogCToLinear(float3 x)
+{
+#if COLOR_GRADING_PRECISE_LOG
+    return float3(
+        LogCToLinear_Precise(x.x),
+        LogCToLinear_Precise(x.y),
+        LogCToLinear_Precise(x.z)
+    );
+#else
+    return (pow(10.0, (x - LogC.d) / LogC.c) - LogC.b) / LogC.a;
+#endif
+}
+
+#endif // UNITY_COLOR_GRADING

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/ColorGrading.hlsl.meta

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+  assetBundleName: 
+  assetBundleVariant: 

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/EyeAdaptation.hlsl

+#ifndef UNITY_EYE_ADAPTATION
+#define UNITY_EYE_ADAPTATION
+
+// Optimal values for PS4/GCN
+// Using a group size of 32x32 seems to be a bit faster on Kepler/Maxwell
+// Don't forget to update 'EyeAdaptationController.cs' if you change these values !
+#define HISTOGRAM_BINS          64
+#define HISTOGRAM_TEXELS        HISTOGRAM_BINS / 4
+#define HISTOGRAM_THREAD_X      16
+#define HISTOGRAM_THREAD_Y      16
+
+float GetHistogramBinFromLuminance(float value, float2 scaleOffset)
+{
+    return saturate(log2(value) * scaleOffset.x + scaleOffset.y);
+}
+
+float GetLuminanceFromHistogramBin(float bin, float2 scaleOffset)
+{
+    return exp2((bin - scaleOffset.y) / scaleOffset.x);
+}
+
+#endif // UNITY_EYE_ADAPTATION

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/EyeAdaptation.hlsl.meta

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+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/EyeAdaptation.shader

+Shader "Hidden/HDRenderPipeline/EyeAdaptation"
+{
+    Properties
+    {
+        _MainTex("Texture", any) = "" {}
+    }
+
+    HLSLINCLUDE
+
+        #pragma target 5.0
+        #include "Common.hlsl"
+        #include "Assets/ScriptableRenderLoop/HDRenderPipeline/ShaderVariables.hlsl"
+        #include "EyeAdaptation.hlsl"
+
+        TEXTURE2D(_MainTex);
+        SAMPLER2D(sampler_MainTex);
+
+        float4 _Params; // x: lowPercent, y: highPercent, z: minBrightness, w: maxBrightness
+        float2 _Speed; // x: down, y: up
+        float4 _ScaleOffsetRes; // x: scale, y: offset, w: histogram pass width, h: histogram pass height
+        float _ExposureCompensation;
+
+        StructuredBuffer<uint> _Histogram;
+
+        float GetBinValue(uint index, float maxHistogramValue)
+        {
+            return float(_Histogram[index]) * maxHistogramValue;
+        }
+
+        float FindMaxHistogramValue()
+        {
+            uint maxValue = 0u;
+
+            for (uint i = 0; i < HISTOGRAM_BINS; i++)
+            {
+                uint h = _Histogram[i];
+                maxValue = max(maxValue, h);
+            }
+
+            return float(maxValue);
+        }
+
+        void FilterLuminance(uint i, float maxHistogramValue, inout float4 filter)
+        {
+            float binValue = GetBinValue(i, maxHistogramValue);
+
+            // Filter dark areas
+            float offset = min(filter.z, binValue);
+            binValue -= offset;
+            filter.zw -= offset.xx;
+
+            // Filter highlights
+            binValue = min(filter.w, binValue);
+            filter.w -= binValue;
+
+            // Luminance at the bin
+            float luminance = GetLuminanceFromHistogramBin(float(i) / float(HISTOGRAM_BINS), _ScaleOffsetRes.xy);
+
+            filter.xy += float2(luminance * binValue, binValue);
+        }
+
+        float GetAverageLuminance(float maxHistogramValue)
+        {
+            // Sum of all bins
+            uint i;
+            float totalSum = 0.0;
+
+            [loop]
+            for (i = 0; i < HISTOGRAM_BINS; i++)
+                totalSum += GetBinValue(i, maxHistogramValue);
+
+            // Skip darker and lighter parts of the histogram to stabilize the auto exposure
+            // x: filtered sum
+            // y: accumulator
+            // zw: fractions
+            float4 filter = float4(0.0, 0.0, totalSum * _Params.xy);
+
+            [loop]
+            for (i = 0; i < HISTOGRAM_BINS; i++)
+                FilterLuminance(i, maxHistogramValue, filter);
+
+            // Clamp to user brightness range
+            return clamp(filter.x / max(filter.y, 1.0e-4), _Params.z, _Params.w);
+        }
+
+        float GetExposureMultiplier(float avgLuminance)
+        {
+            avgLuminance = max(1.0e-4, avgLuminance);
+
+            //half keyValue = 1.03 - (2.0 / (2.0 + log2(avgLuminance + 1.0)));
+            half keyValue = _ExposureCompensation;
+            half exposure = keyValue / avgLuminance;
+
+            return exposure;
+        }
+
+        float InterpolateExposure(float newExposure, float oldExposure)
+        {
+            float delta = newExposure - oldExposure;
+            float speed = delta > 0.0 ? _Speed.x : _Speed.y;
+            float exposure = oldExposure + delta * (1.0 - exp2(-unity_DeltaTime.x * speed));
+            //float exposure = oldExposure + delta * (unity_DeltaTime.x * speed);
+            return exposure;
+        }
+
+        struct Attributes
+        {
+            float4 vertex : POSITION;
+            float4 texcoord : TEXCOORD0;
+        };
+
+        struct Varyings
+        {
+            float4 pos : SV_POSITION;
+            float2 uv : TEXCOORD0;
+        };
+
+        Varyings Vert(Attributes v)
+        {
+            Varyings o;
+            o.pos = TransformWorldToHClip(v.vertex.xyz);
+            o.uv = v.texcoord.xy;
+            return o;
+        }
+
+        float4 FragAdaptProgressive(Varyings i) : SV_Target
+        {
+            float maxValue = 1.0 / FindMaxHistogramValue();
+            float avgLuminance = GetAverageLuminance(maxValue);
+            float exposure = GetExposureMultiplier(avgLuminance);
+            float prevExposure = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, (0.5).xx).r;
+            exposure = InterpolateExposure(exposure, prevExposure);
+            return exposure.xxxx;
+        }
+
+        float4 FragAdaptFixed(Varyings i) : SV_Target
+        {
+            float maxValue = 1.0 / FindMaxHistogramValue();
+            float avgLuminance = GetAverageLuminance(maxValue);
+            float exposure = GetExposureMultiplier(avgLuminance);
+            return exposure.xxxx;
+        }
+
+        // Editor stuff (histogram debug visualization)
+        int _DebugWidth;
+
+        struct VaryingsEditorHisto
+        {
+            float4 pos : SV_POSITION;
+            float2 uv : TEXCOORD0;
+            float maxValue : TEXCOORD1;
+            float avgLuminance : TEXCOORD2;
+        };
+
+        VaryingsEditorHisto VertEditorHisto(Attributes v)
+        {
+            VaryingsEditorHisto o;
+            o.pos = TransformWorldToHClip(v.vertex.xyz);
+            o.uv = v.texcoord.xy;
+            o.maxValue = 1.0 / FindMaxHistogramValue();
+            o.avgLuminance = GetAverageLuminance(o.maxValue);
+            return o;
+        }
+
+        float4 FragEditorHisto(VaryingsEditorHisto i) : SV_Target
+        {
+            const float3 kRangeColor = float3(0.05, 0.4, 0.6);
+            const float3 kAvgColor = float3(0.8, 0.3, 0.05);
+
+            float4 color = float4(0.0, 0.0, 0.0, 0.7);
+
+            uint ix = (uint)(round(i.uv.x * HISTOGRAM_BINS));
+            float bin = saturate(float(_Histogram[ix]) * i.maxValue);
+            float fill = step(i.uv.y, bin);
+
+            // Min / max brightness markers
+            float luminanceMin = GetHistogramBinFromLuminance(_Params.z, _ScaleOffsetRes.xy);
+            float luminanceMax = GetHistogramBinFromLuminance(_Params.w, _ScaleOffsetRes.xy);
+
+            color.rgb += fill.rrr;
+
+            if (i.uv.x > luminanceMin && i.uv.x < luminanceMax)
+            {
+                color.rgb = fill.rrr * kRangeColor;
+                color.rgb += kRangeColor;
+            }
+
+            // Current average luminance marker
+            float luminanceAvg = GetHistogramBinFromLuminance(i.avgLuminance, _ScaleOffsetRes.xy);
+            float avgPx = luminanceAvg * _DebugWidth;
+
+            if (abs(i.pos.x - avgPx) < 2)
+                color.rgb = kAvgColor;
+
+            return color;
+        }
+
+    ENDHLSL
+
+    SubShader
+    {
+        Cull Off ZWrite Off ZTest Always
+
+        Pass
+        {
+            HLSLPROGRAM
+
+                #pragma vertex Vert
+                #pragma fragment FragAdaptProgressive
+
+            ENDHLSL
+        }
+
+        Pass
+        {
+            HLSLPROGRAM
+
+                #pragma vertex Vert
+                #pragma fragment FragAdaptFixed
+
+            ENDHLSL
+        }
+
+        Pass
+        {
+            HLSLPROGRAM
+
+                #pragma vertex VertEditorHisto
+                #pragma fragment FragEditorHisto
+
+            ENDHLSL
+        }
+    }
+
+    Fallback Off
+}

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/EyeAdaptation.shader.meta

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Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/EyeHistogram.compute

+// Put the following line to 0 or comment it to disable vignette weighting
+#define USE_VIGNETTE_WEIGHTING 1
+
+#include "Common.hlsl"
+#include "EyeAdaptation.hlsl"
+
+RWStructuredBuffer<uint> _Histogram;
+Texture2D<float4> _Source;
+
+CBUFFER_START(Params)
+    float4 _ScaleOffsetRes; // x: scale, y: offset, z: width, w: height
+CBUFFER_END
+
+groupshared uint gs_histogram[HISTOGRAM_BINS];
+
+#pragma kernel KEyeHistogram
+[numthreads(HISTOGRAM_THREAD_X,HISTOGRAM_THREAD_Y,1)]
+void KEyeHistogram(uint2 dispatchThreadId : SV_DispatchThreadID, uint2 groupThreadId : SV_GroupThreadID)
+{
+    // Pretty straightforward implementation of histogram gathering using atomic ops.
+    // I tried a few methods (no atomic ops / heavy LDS leveraging) but this one turned out to be
+    // the fastest on desktop (Nvidia - Kepler/Maxwell) and PS4. Still need to try it on GCN/desktop
+    // but considering it runs very fast on PS4 we can expect it to run well (?).
+
+    const uint localThreadId = groupThreadId.y * HISTOGRAM_THREAD_X + groupThreadId.x;
+
+    // Clears the shared memory
+    if (localThreadId < HISTOGRAM_BINS)
+        gs_histogram[localThreadId] = 0u;
+
+    GroupMemoryBarrierWithGroupSync();
+
+    // Gather local group histogram
+    if (dispatchThreadId.x < (uint)_ScaleOffsetRes.z && dispatchThreadId.y < (uint)_ScaleOffsetRes.w)
+    {
+#if USE_VIGNETTE_WEIGHTING
+        // Vignette weighting to put more focus on what's in the center of the screen
+        float2 uv01 = float2(dispatchThreadId) / float2(_ScaleOffsetRes.z, _ScaleOffsetRes.w);
+        float2 d = abs(uv01 - (0.5).xx);
+        float vfactor = saturate(1.0 - dot(d, d));
+        vfactor *= vfactor;
+        uint weight = (uint)(64.0 * vfactor);
+#else
+        uint weight = 1u;
+#endif
+
+        float3 color = _Source[dispatchThreadId].xyz;
+        float luminance = max(color.r, max(color.g, color.b)); // Looks more natural than using a Rec.709 luminance
+        float logLuminance = GetHistogramBinFromLuminance(luminance, _ScaleOffsetRes.xy);
+        uint idx = (uint)(logLuminance * (HISTOGRAM_BINS - 1u));
+        InterlockedAdd(gs_histogram[idx], weight);
+    }
+
+    GroupMemoryBarrierWithGroupSync();
+
+    // Merge everything
+    if (localThreadId < HISTOGRAM_BINS)
+        InterlockedAdd(_Histogram[localThreadId], gs_histogram[localThreadId]);
+}

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/EyeHistogram.compute.meta

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Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Resources/LutGen.shader

+Shader "Hidden/HDRenderPipeline/LutGen"
+{
+    HLSLINCLUDE
+
+        #pragma target 5.0
+        #include "Common.hlsl"
+        #include "Assets/ScriptableRenderLoop/HDRenderPipeline/ShaderVariables.hlsl"
+        #include "ColorGrading.hlsl"
+
+        float4 _LutParams;
+
+        struct Attributes 
+        {
+            float3 vertex : POSITION;
+            float2 texcoord : TEXCOORD0;
+        };
+
+        struct Varyings 
+        {
+            float4 vertex : SV_POSITION;
+            float2 texcoord : TEXCOORD0;
+        };
+
+        Varyings Vert(Attributes input)
+        {
+            Varyings output;
+            output.vertex = TransformWorldToHClip(input.vertex);
+            output.texcoord = input.texcoord.xy;
+            return output;
+        }
+
+        float4 Frag(Varyings input) : SV_Target
+        {
+            // 2D strip lut
+            float2 uv = input.texcoord - _LutParams.yz;
+            float3 color;
+            color.r = frac(uv.x * _LutParams.x);
+            color.b = uv.x - color.r / _LutParams.x;
+            color.g = uv.y;
+
+            // Lut is in LogC
+            float3 colorLogC = color * _LutParams.w;
+
+            // Switch back to unity linear
+            float3 colorLinear = LogCToLinear(colorLogC);
+
+            return float4(colorLinear, 1.0);
+        }
+
+    ENDHLSL
+
+    SubShader
+    {
+        Cull Off ZWrite Off ZTest Always
+
+        Pass
+        {
+            HLSLPROGRAM
+
+                #pragma vertex Vert
+                #pragma fragment Frag
+
+            ENDHLSL
+        }
+    }
+
+    Fallback Off
+}

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Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Editor/PostProcessingEditor.cs

+using System.IO;
+using UnityEngine;
+using UnityEngine.Experimental.Rendering.HDPipeline;
+
+namespace UnityEditor.Experimental.Rendering.HDPipeline
+{
+    using GradingType = PostProcessing.ColorGradingSettings.GradingType;
+    using EyeAdaptationType = PostProcessing.EyeAdaptationSettings.EyeAdaptationType;
+
+    [CustomEditor(typeof(PostProcessing))]
+    public class PostProcessingEditor : Editor
+    {
+        public class ColorGradingSettings
+        {
+            public SerializedProperty type;
+            public SerializedProperty exposure;
+
+            public SerializedProperty logLut;
+
+            public SerializedProperty neutralBlackIn;
+            public SerializedProperty neutralWhiteIn;
+            public SerializedProperty neutralBlackOut;
+            public SerializedProperty neutralWhiteOut;
+            public SerializedProperty neutralWhiteLevel;
+            public SerializedProperty neutralWhiteClip;
+        }
+
+        public class EyeAdaptationSettings
+        {
+            public SerializedProperty enabled;
+            public SerializedProperty showDebugHistogramInGameView;
+
+            public SerializedProperty lowPercent;
+            public SerializedProperty highPercent;
+
+            public SerializedProperty minLuminance;
+            public SerializedProperty maxLuminance;
+            public SerializedProperty exposureCompensation;
+
+            public SerializedProperty adaptationType;
+
+            public SerializedProperty speedUp;
+            public SerializedProperty speedDown;
+
+            public SerializedProperty logMin;
+            public SerializedProperty logMax;
+        }
+
+        public ColorGradingSettings colorGrading;
+        public EyeAdaptationSettings eyeAdaptation;
+
+        void OnEnable()
+        {
+            colorGrading = new ColorGradingSettings()
+            {
+                type = serializedObject.FindProperty("colorGrading.type"),
+                exposure = serializedObject.FindProperty("colorGrading.exposure"),
+
+                logLut = serializedObject.FindProperty("colorGrading.logLut"),
+
+                neutralBlackIn = serializedObject.FindProperty("colorGrading.neutralBlackIn"),
+                neutralWhiteIn = serializedObject.FindProperty("colorGrading.neutralWhiteIn"),
+                neutralBlackOut = serializedObject.FindProperty("colorGrading.neutralBlackOut"),
+                neutralWhiteOut = serializedObject.FindProperty("colorGrading.neutralWhiteOut"),
+                neutralWhiteLevel = serializedObject.FindProperty("colorGrading.neutralWhiteLevel"),
+                neutralWhiteClip = serializedObject.FindProperty("colorGrading.neutralWhiteClip")
+            };
+
+            eyeAdaptation = new EyeAdaptationSettings()
+            {
+                enabled = serializedObject.FindProperty("eyeAdaptation.enabled"),
+                showDebugHistogramInGameView = serializedObject.FindProperty("eyeAdaptation.showDebugHistogramInGameView"),
+
+                lowPercent = serializedObject.FindProperty("eyeAdaptation.lowPercent"),
+                highPercent = serializedObject.FindProperty("eyeAdaptation.highPercent"),
+
+                minLuminance = serializedObject.FindProperty("eyeAdaptation.minLuminance"),
+                maxLuminance = serializedObject.FindProperty("eyeAdaptation.maxLuminance"),
+                exposureCompensation = serializedObject.FindProperty("eyeAdaptation.exposureCompensation"),
+
+                adaptationType = serializedObject.FindProperty("eyeAdaptation.adaptationType"),
+
+                speedUp = serializedObject.FindProperty("eyeAdaptation.speedUp"),
+                speedDown = serializedObject.FindProperty("eyeAdaptation.speedDown"),
+
+                logMin = serializedObject.FindProperty("eyeAdaptation.logMin"),
+                logMax = serializedObject.FindProperty("eyeAdaptation.logMax")
+            };
+        }
+
+        public override void OnInspectorGUI()
+        {
+            serializedObject.Update();
+
+            var camera = (target as PostProcessing).GetComponent<Camera>();
+            if (camera == null)
+                EditorGUILayout.HelpBox("Global post-processing settings will be overriden by local camera settings. Global settings are the only one visible in the scene view.", MessageType.Info);
+
+            EditorGUILayout.LabelField("Color Grading", EditorStyles.boldLabel);
+
+            EditorGUI.indentLevel++;
+
+            if (camera != null)
+            {
+                using (new EditorGUILayout.HorizontalScope())
+                {
+                    GUILayout.Space(EditorGUI.indentLevel * 15f);
+                    if (GUILayout.Button("Export frame to EXR", EditorStyles.miniButton))
+                    {
+                        string path = EditorUtility.SaveFilePanelInProject("Export frame as EXR...", "Frame.exr", "exr", "");
+
+                        if (!string.IsNullOrEmpty(path))
+                            SaveFrameToEXR(camera, path);
+                    }
+                }
+            }
+
+            EditorGUILayout.PropertyField(colorGrading.exposure);
+            EditorGUILayout.PropertyField(colorGrading.type);
+
+            EditorGUI.indentLevel++;
+
+            var gradingType = (GradingType)colorGrading.type.intValue;
+
+            if (gradingType == GradingType.Custom)
+            {
+                EditorGUILayout.PropertyField(colorGrading.logLut);
+
+                if (!ValidateLutImportSettings())
+                {
+                    EditorGUILayout.HelpBox("Invalid LUT import settings.", MessageType.Warning);
+
+                    GUILayout.Space(-32);
+                    using (new EditorGUILayout.HorizontalScope())
+                    {
+                        GUILayout.FlexibleSpace();
+                        if (GUILayout.Button("Fix", GUILayout.Width(60)))
+                        {
+                            SetLUTImportSettings();
+                            AssetDatabase.Refresh();
+                        }
+                        GUILayout.Space(8);
+                    }
+                    GUILayout.Space(11);
+                }
+            }
+            else if (gradingType == GradingType.Neutral)
+            {
+                EditorGUILayout.PropertyField(colorGrading.neutralBlackIn);
+                EditorGUILayout.PropertyField(colorGrading.neutralWhiteIn);
+                EditorGUILayout.PropertyField(colorGrading.neutralBlackOut);
+                EditorGUILayout.PropertyField(colorGrading.neutralWhiteOut);
+                EditorGUILayout.PropertyField(colorGrading.neutralWhiteLevel);
+                EditorGUILayout.PropertyField(colorGrading.neutralWhiteClip);
+            }
+
+            EditorGUI.indentLevel--;
+            EditorGUI.indentLevel--;
+
+            EditorGUILayout.LabelField("Eye Adaptation", EditorStyles.boldLabel);
+
+            EditorGUI.indentLevel++;
+
+            EditorGUILayout.PropertyField(eyeAdaptation.enabled);
+
+            if (eyeAdaptation.enabled.boolValue)
+            {
+                EditorGUILayout.PropertyField(eyeAdaptation.showDebugHistogramInGameView);
+
+                EditorGUILayout.PropertyField(eyeAdaptation.logMin, new GUIContent("Histogram Log Min"));
+                EditorGUILayout.PropertyField(eyeAdaptation.logMax, new GUIContent("Histogram Log Max"));
+                EditorGUILayout.Space();
+
+                float low = eyeAdaptation.lowPercent.floatValue;
+                float high = eyeAdaptation.highPercent.floatValue;
+
+                EditorGUILayout.MinMaxSlider(new GUIContent("Filter"), ref low, ref high, 1f, 99f);
+
+                eyeAdaptation.lowPercent.floatValue = low;
+                eyeAdaptation.highPercent.floatValue = high;
+
+                EditorGUILayout.PropertyField(eyeAdaptation.minLuminance);
+                EditorGUILayout.PropertyField(eyeAdaptation.maxLuminance);
+                EditorGUILayout.PropertyField(eyeAdaptation.exposureCompensation);
+
+                EditorGUILayout.PropertyField(eyeAdaptation.adaptationType);
+
+                if (eyeAdaptation.adaptationType.intValue == (int)EyeAdaptationType.Progressive)
+                {
+                    EditorGUI.indentLevel++;
+                    EditorGUILayout.PropertyField(eyeAdaptation.speedUp);
+                    EditorGUILayout.PropertyField(eyeAdaptation.speedDown);
+                    EditorGUI.indentLevel--;
+                }
+            }
+
+            EditorGUI.indentLevel--;
+
+            serializedObject.ApplyModifiedProperties();
+        }
+
+        void SetLUTImportSettings()
+        {
+            var lut = (target as PostProcessing).colorGrading.logLut;
+            var importer = (TextureImporter)AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(lut));
+            importer.textureType = TextureImporterType.Default;
+            importer.filterMode = FilterMode.Bilinear;
+            importer.mipmapEnabled = false;
+            importer.anisoLevel = 0;
+            importer.sRGBTexture = false;
+            importer.npotScale = TextureImporterNPOTScale.None;
+            importer.textureCompression = TextureImporterCompression.Uncompressed;
+            importer.SaveAndReimport();
+            AssetDatabase.Refresh();
+        }
+
+        bool ValidateLutImportSettings()
+        {
+            var lut = (target as PostProcessing).colorGrading.logLut;
+
+            if (lut == null)
+                return true;
+
+            var importer = (TextureImporter)AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(lut));
+            return importer.anisoLevel == 0
+                && importer.mipmapEnabled == false
+                && importer.sRGBTexture == false
+                && (importer.textureCompression == TextureImporterCompression.Uncompressed)
+                && importer.filterMode == FilterMode.Bilinear;
+        }
+
+        void SaveFrameToEXR(Camera camera, string path)
+        {
+            // We want a 1024x32 sized render at a minimum so that we have enough space to stamp the lut
+            var aspect = (float)camera.pixelHeight / (float)camera.pixelWidth;
+            var width = camera.pixelWidth >= 1024
+                ? camera.pixelWidth
+                : 1024;
+            var height = Mathf.RoundToInt(width * aspect);
+
+            var texture = new Texture2D(width, height, TextureFormat.RGBAHalf, false, true);
+            var targetRt = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
+
+            // Render the current frame without post processing
+            var oldPPState = (target as PostProcessing).enabled;
+            (target as PostProcessing).enabled = false;
+            var oldTarget = camera.targetTexture;
+            var oldActive = RenderTexture.active;
+            camera.targetTexture = targetRt;
+            camera.Render();
+
+            // Stamp the log lut in the top left corner
+            const int k_InternalLogLutSize = 32;
+            var stampMaterial = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/LutGen");
+            stampMaterial.SetVector("_LutParams", new Vector4(
+                    k_InternalLogLutSize,
+                    0.5f / (k_InternalLogLutSize * k_InternalLogLutSize),
+                    0.5f / k_InternalLogLutSize,
+                    k_InternalLogLutSize / (k_InternalLogLutSize - 1f))
+                );
+
+            var stampRt = RenderTexture.GetTemporary(1024, 32, 0, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Linear);
+            Graphics.Blit(null, stampRt, stampMaterial, 0);
+
+            RenderTexture.active = targetRt;
+            GL.PushMatrix();
+            {
+                GL.LoadPixelMatrix(0, width, height, 0);
+                Graphics.DrawTexture(new Rect(0, 0, stampRt.width, stampRt.height), stampRt);
+            }
+            GL.PopMatrix();
+
+            // Read back
+            texture.ReadPixels(new Rect(0, 0, targetRt.width, targetRt.height), 0, 0);
+            camera.targetTexture = oldTarget;
+            RenderTexture.active = oldActive;
+            (target as PostProcessing).enabled = oldPPState;
+
+            // Cleanup
+            RenderTexture.ReleaseTemporary(stampRt);
+            RenderTexture.ReleaseTemporary(targetRt);
+            Utilities.Destroy(stampMaterial);
+
+            // Save
+            File.WriteAllBytes(path, texture.EncodeToEXR(Texture2D.EXRFlags.CompressPIZ));
+            AssetDatabase.Refresh();
+        }
+    }
+}

Assets/ScriptableRenderLoop/HDRenderPipeline/PostProcess/Editor/PostProcessingEditor.cs.meta

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+timeCreated: 1483612569
+licenseType: Pro
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+  executionOrder: 0
+  icon: {instanceID: 0}
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