Eliminated unnecessary blit to an intermediate temp RT by allowing PPV2 screen space RTs to be created with random write access. This way FSR2 can output directly to the PPV2 effects chain.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/SuperResolution.cs

@@ -107,7 +107,7 @@ namespace UnityEngine.Rendering.PostProcessing
         private Fsr2Context _fsrContext;
         private Vector2Int _renderSize;
         private Vector2Int _displaySize;
-        private bool _reset;
+        private bool _resetHistory;
 
         private IFsr2Callbacks _callbacks;
         private float _appliedBiasOffset;
@@ -138,7 +138,7 @@ namespace UnityEngine.Rendering.PostProcessing
 
         public void ResetHistory()
         {
-            _reset = true;
+            _resetHistory = true;
         }
 
         public void ConfigureJitteredProjectionMatrix(PostProcessRenderContext context)
@@ -192,15 +192,11 @@ namespace UnityEngine.Rendering.PostProcessing
                 _dispatchDescription.Reactive = Fsr2ShaderIDs.UavAutoReactive;
             }
             
-            cmd.GetTemporaryRT(Fsr2ShaderIDs.UavUpscaledOutput, _displaySize.x, _displaySize.y, 0, default, context.sourceFormat, default, 1, true);
-            
             _fsrContext.Dispatch(_dispatchDescription, cmd);
             
-            cmd.BlitFullscreenTriangle(Fsr2ShaderIDs.UavUpscaledOutput, context.destination);
-            cmd.ReleaseTemporaryRT(Fsr2ShaderIDs.UavUpscaledOutput);
             cmd.EndSample("FSR2");
             
-            _reset = false;
+            _resetHistory = false;
         }
 
         private void CreateFsrContext(PostProcessRenderContext context)
@@ -282,7 +278,7 @@ namespace UnityEngine.Rendering.PostProcessing
             if (reactiveMask != null) _dispatchDescription.Reactive = reactiveMask;
             if (transparencyAndCompositionMask != null) _dispatchDescription.TransparencyAndComposition = transparencyAndCompositionMask;
             
-            _dispatchDescription.Output = null;
+            _dispatchDescription.Output = context.destination;
             _dispatchDescription.PreExposure = preExposure;
             _dispatchDescription.EnableSharpening = performSharpenPass;
             _dispatchDescription.Sharpness = sharpness;
@@ -295,7 +291,7 @@ namespace UnityEngine.Rendering.PostProcessing
             _dispatchDescription.CameraFar = camera.farClipPlane;
             _dispatchDescription.CameraFovAngleVertical = camera.fieldOfView * Mathf.Deg2Rad;
             _dispatchDescription.ViewSpaceToMetersFactor = 1.0f; // 1 unit is 1 meter in Unity
-            _dispatchDescription.Reset = _reset;
+            _dispatchDescription.Reset = _resetHistory;
 
             _dispatchDescription.EnableAutoReactive = autoGenerateTransparencyAndComposition;
             if (autoGenerateTransparencyAndComposition)

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessLayer.cs

@@ -1181,7 +1181,7 @@ namespace UnityEngine.Rendering.PostProcessing
                     
                     var fsrTarget = m_TargetPool.Get();
                     var finalDestination = context.destination;
-                    context.GetScreenSpaceTemporaryRT(cmd, fsrTarget, 0, context.sourceFormat);
+                    context.GetScreenSpaceTemporaryRT(cmd, fsrTarget, 0, context.sourceFormat, enableRandomWrite: true);
                     context.destination = fsrTarget;
                     superResolution.colorOpaqueOnly = m_opaqueOnly;
                     superResolution.Render(context);

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessRenderContext.cs

@@ -372,9 +372,10 @@ namespace UnityEngine.Rendering.PostProcessing
         /// <param name="filter">The texture filtering mode</param>
         /// <param name="widthOverride">Override the display width; use <c>0</c> to disable the override</param>
         /// <param name="heightOverride">Override the display height; use <c>0</c> to disable the override</param>
+        /// <param name="enableRandomWrite">Enable random access write into this render texture</param>
         public void GetScreenSpaceTemporaryRT(CommandBuffer cmd, int nameID,
             int depthBufferBits = 0, RenderTextureFormat colorFormat = RenderTextureFormat.Default, RenderTextureReadWrite readWrite = RenderTextureReadWrite.Default,
-            FilterMode filter = FilterMode.Bilinear, int widthOverride = 0, int heightOverride = 0)
+            FilterMode filter = FilterMode.Bilinear, int widthOverride = 0, int heightOverride = 0, bool enableRandomWrite = false)
         {
             var desc = GetDescriptor(depthBufferBits, colorFormat, readWrite);
             if (widthOverride > 0)
@@ -386,6 +387,9 @@ namespace UnityEngine.Rendering.PostProcessing
             if (stereoActive && desc.dimension == Rendering.TextureDimension.Tex2DArray)
                 desc.dimension = Rendering.TextureDimension.Tex2D;
 
+            if (enableRandomWrite)
+                desc.enableRandomWrite = true;
+
 #if UNITY_2019_1_OR_NEWER
             cmd.GetTemporaryRT(nameID, desc, filter);
 #elif UNITY_2017_3_OR_NEWER