Added a helper script to allow OnPreCull to happen at a different location in the camera stack from the image effect script.

Also added a scene with PPV2 effects and FSR2 as post-PPV2 image effect to test and demonstrate this.

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Assets/Scenes/SampleScenePPV2Post_Profiles/Main Camera Profile.asset.meta

@@ -0,0 +1,8 @@
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+guid: 13186bf6dcb8dc142be09c11eb7901d4
+NativeFormatImporter:
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+  mainObjectFileID: 11400000
+  userData: 
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Assets/Scripts/Fsr2ImageEffect.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections;
 using UnityEngine;
 using UnityEngine.Experimental.Rendering;
@@ -33,7 +34,7 @@ namespace FidelityFX
         [SerializeField] private GenerateReactiveParameters generateReactiveParameters = new GenerateReactiveParameters();
         public GenerateReactiveParameters GenerateReactiveParams => generateReactiveParameters;
         
-        [System.Serializable]
+        [Serializable]
         public class GenerateReactiveParameters
         {
             [Range(0, 2)] public float scale = 0.5f;
@@ -47,14 +48,16 @@ namespace FidelityFX
         private Vector2Int _displaySize;
         private bool _reset;
         
+        private readonly Fsr2.DispatchDescription _dispatchDescription = new Fsr2.DispatchDescription();
+        private readonly Fsr2.GenerateReactiveDescription _genReactiveDescription = new Fsr2.GenerateReactiveDescription();
+
+        private Fsr2ImageEffectHelper _helper;
+        
         private Camera _renderCamera;
         private RenderTexture _originalRenderTarget;
         private DepthTextureMode _originalDepthTextureMode;
         private Rect _originalRect;
 
-        private readonly Fsr2.DispatchDescription _dispatchDescription = new Fsr2.DispatchDescription();
-        private readonly Fsr2.GenerateReactiveDescription _genReactiveDescription = new Fsr2.GenerateReactiveDescription();
-
         private Fsr2.QualityMode _prevQualityMode;
         private Vector2Int _prevDisplaySize;
         private bool _prevGenReactiveMask;
@@ -66,6 +69,8 @@ namespace FidelityFX
         
         private void OnEnable()
         {
+            _helper = GetComponent<Fsr2ImageEffectHelper>();
+            
             // Set up the original camera to output all of the required FSR2 input resources at the desired resolution
             _renderCamera = GetComponent<Camera>();
             _originalDepthTextureMode = _renderCamera.depthTextureMode;
@@ -159,12 +164,20 @@ namespace FidelityFX
             _reset = true;
         }
 
+        private void LateUpdate()
+        {
+            // Remember the original camera viewport before we modify it in OnPreCull
+            _originalRect = _renderCamera.rect;
+        }
+
         private void OnPreCull()
+        {
+            if (_helper == null || !_helper.enabled)
             {
                 // Render to a smaller portion of the screen by manipulating the camera's viewport rect
-            _originalRect = _renderCamera.rect;
                 _renderCamera.aspect = (_renderCamera.pixelWidth * _originalRect.width) / (_renderCamera.pixelHeight * _originalRect.height);
                 _renderCamera.rect = new Rect(0, 0, _originalRect.width * _renderSize.x / _displaySize.x, _originalRect.height * _renderSize.y / _displaySize.y);
+            }
 
             // Set up the parameters to auto-generate a reactive mask
             if (autoGenerateReactiveMask)

Assets/Scripts/Fsr2ImageEffectHelper.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace FidelityFX
+{
+    [RequireComponent(typeof(Camera), typeof(Fsr2ImageEffect))]
+    public class Fsr2ImageEffectHelper : MonoBehaviour
+    {
+        private Camera _renderCamera;
+        private Fsr2ImageEffect _imageEffect;
+
+        private void OnEnable()
+        {
+            _renderCamera = GetComponent<Camera>();
+            _imageEffect = GetComponent<Fsr2ImageEffect>();
+        }
+
+        private void OnPreCull()
+        {
+            if (_imageEffect == null || !_imageEffect.enabled)
+                return;
+            
+            var originalRect = _renderCamera.rect;
+            float upscaleRatio = Fsr2.GetUpscaleRatioFromQualityMode(_imageEffect.qualityMode);
+
+            // Render to a smaller portion of the screen by manipulating the camera's viewport rect
+            _renderCamera.aspect = (_renderCamera.pixelWidth * originalRect.width) / (_renderCamera.pixelHeight * originalRect.height);
+            _renderCamera.rect = new Rect(0, 0, originalRect.width / upscaleRatio, originalRect.height / upscaleRatio);
+        }
+    }
+}

Assets/Scripts/Fsr2ImageEffectHelper.cs.meta

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