Revert "Improve MSAA color resolve when very different samples are merged together (#1839)"

sebastienlagarde · sebastienlagarde · commit 78e59bb551c2 · 2020-09-28T18:11:56.000+02:00
This reverts commit 359a97a.
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diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -128,7 +128,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Optimized Grain and sRGB Dithering.
 - On platforms that allow it skip the first mip of the depth pyramid and compute it alongside the depth buffer used for low res transparents.
 - When trying to install the local configuration package, if another one is already present the user is now asked whether they want to keep it or not.
-- Improved MSAA color resolve to fix issues when very bright and very dark samples are resolved together.
 
 ## [10.0.0] - 2019-06-10
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/RenderPass/MSAA/ColorResolve.shader b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/RenderPass/MSAA/ColorResolve.shader
@@ -33,41 +33,11 @@ Shader "Hidden/HDRP/ColorResolve"
             return output;
         }
 
-        float ResolveWeight(float4 color, float totalSampleCount)
-        {
-            const float boxFilterWeight = rcp(totalSampleCount);
-            float toneMapWeight = rcp(1.0f + Luminance(color.xyz));
-
-            return boxFilterWeight * toneMapWeight;
-        }
-
-        float InverseToneMapWeight(float4 color)
-        {
-            return rcp(1.0f - Luminance(color.xyz));
-        }
-
         float4 LoadColorTextureMS(float2 pixelCoords, uint sampleIndex)
         {
             return LOAD_TEXTURE2D_X_MSAA(_ColorTextureMS, pixelCoords, sampleIndex);
         }
 
-        float4 Resolve(Varyings input, uint sampleCount)
-        {
-            UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
-            int2 pixelCoords = int2(input.texcoord);
-
-            float4 finalVal = 0;
-            for (int i = 0; i < sampleCount; ++i)
-            {
-                float4 currSample = (LoadColorTextureMS(pixelCoords, i));
-                finalVal += currSample * ResolveWeight(currSample, sampleCount);
-            }
-
-            finalVal.xyz *= InverseToneMapWeight(finalVal);
-
-            return float4(finalVal.rgb, 1.0f);
-        }
-
         float4 Frag1X(Varyings input) : SV_Target
         {
             UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
@@ -77,19 +47,28 @@ Shader "Hidden/HDRP/ColorResolve"
 
         float4 Frag2X(Varyings input) : SV_Target
         {
-            return Resolve(input, 2);
+            UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
+            int2 pixelCoords = int2(input.texcoord);
+            return FastTonemapInvert((FastTonemap(LoadColorTextureMS(pixelCoords, 0)) + FastTonemap(LoadColorTextureMS(pixelCoords, 1))) * 0.5f);
         }
 
         float4 Frag4X(Varyings input) : SV_Target
         {
-            return Resolve(input, 4);
+            UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
+            int2 pixelCoords = int2(input.texcoord);
+            return FastTonemapInvert((FastTonemap(LoadColorTextureMS(pixelCoords, 0)) + FastTonemap(LoadColorTextureMS(pixelCoords, 1))
+                                    + FastTonemap(LoadColorTextureMS(pixelCoords, 2)) + FastTonemap(LoadColorTextureMS(pixelCoords, 3))) * 0.25f);
         }
 
         float4 Frag8X(Varyings input) : SV_Target
         {
-            return Resolve(input, 8);
+            UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
+            int2 pixelCoords = int2(input.texcoord);
+            return FastTonemapInvert((FastTonemap(LoadColorTextureMS(pixelCoords, 0)) + FastTonemap(LoadColorTextureMS(pixelCoords, 1))
+                                    + FastTonemap(LoadColorTextureMS(pixelCoords, 2)) + FastTonemap(LoadColorTextureMS(pixelCoords, 3))
+                                    + FastTonemap(LoadColorTextureMS(pixelCoords, 4)) + FastTonemap(LoadColorTextureMS(pixelCoords, 5))
+                                    + FastTonemap(LoadColorTextureMS(pixelCoords, 6)) + FastTonemap(LoadColorTextureMS(pixelCoords, 7))) * 0.125f);
         }
-
     ENDHLSL
     SubShader
     {
