Added initial implementation of post-processing stack effect for FSR2, with a new scene to test it in.

This contains the results of a bunch of research so far, on where code gets executed and how to inject additional steps into the render loop.

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Assets/Scripts/Fsr2PostProcessEffect.cs

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+#if UNITY_POST_PROCESSING_STACK_V2
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Rendering.PostProcessing;
+
+namespace FidelityFX
+{
+    [Serializable]
+    [PostProcess(typeof(Fsr2PostProcessRenderer), PostProcessEvent.BeforeStack, "FidelityFX/FSR 2", false)]
+    public class Fsr2PostProcessEffect : PostProcessEffectSettings
+    {
+        public Fsr2QualityModeParameter qualityMode = new Fsr2QualityModeParameter() { value = Fsr2.QualityMode.Quality };
+
+        public BoolParameter performSharpenPass = new BoolParameter() { value = true };
+        [Range(0, 1)] public FloatParameter sharpness = new FloatParameter() { value = 0.8f };
+        
+        [Tooltip("Allow the use of half precision compute operations, potentially improving performance")]
+        public BoolParameter enableFP16 = new BoolParameter() { value = false };
+
+        [Header("Exposure")]
+        public BoolParameter enableAutoExposure = new BoolParameter() { value = true };
+        public FloatParameter preExposure = new FloatParameter() { value = 1.0f };
+        
+        [Header("Reactivity, Transparency & Composition")]
+        public BoolParameter autoGenerateReactiveMask = new BoolParameter() { value = true };
+
+        public override bool IsEnabledAndSupported(PostProcessRenderContext context)
+        {
+            return base.IsEnabledAndSupported(context) && SystemInfo.supportsComputeShaders;
+        }
+    }
+
+    [Serializable]
+    public class Fsr2QualityModeParameter : ParameterOverride<Fsr2.QualityMode>
+    {
+    }
+
+    public class Fsr2PostProcessRenderer : PostProcessEffectRenderer<Fsr2PostProcessEffect>
+    {
+        private Fsr2Context _fsrContext;
+        private Fsr2PostProcessHelper _helper;
+
+        private Vector2Int _displaySize;
+        private Vector2Int _renderSize;
+        
+        private Fsr2.QualityMode _prevQualityMode;
+        
+        public override void Init()
+        {
+            base.Init();
+            
+            Debug.Log($"Initializing FSR2 post-process effect, quality = {settings.qualityMode.value}");
+        }
+
+        public override void Release()
+        {
+            Debug.Log("Releasing FSR2 post-process effect");
+            
+            base.Release();
+        }
+
+        public override DepthTextureMode GetCameraFlags()
+        {
+            return DepthTextureMode.Depth | DepthTextureMode.MotionVectors;
+        }
+
+        public override void Render(PostProcessRenderContext context)
+        {
+            var cmd = context.command;
+
+            if (!Application.isPlaying)
+            {
+                // We don't want this effect to start injecting scripts in edit mode, so just blit and skip the rest entirely
+                cmd.BlitFullscreenTriangle(context.source, context.destination);
+                return;
+            }
+
+            // Monitor for any resolution changes and recreate the FSR2 context if necessary
+            // We can't create an FSR2 context without info from the post-processing context, so delay the initial setup until here
+            if (_fsrContext == null || context.screenWidth != _displaySize.x || context.screenHeight != _displaySize.y || settings.qualityMode != _prevQualityMode)
+            {
+                DestroyFsrContext();
+                CreateFsrContext(context);
+                
+                _prevQualityMode = settings.qualityMode;
+            }
+            
+            // Ensure that the helper script exists and is enabled
+            if (_helper == null || !_helper.enabled)
+            {
+                if (_helper == null)
+                    Inject(context);
+                
+                _helper.enabled = settings.IsEnabledAndSupported(context);
+                
+                // The injected script won't come into effect until the next frame, so just do a simple blit this frame
+                cmd.BlitFullscreenTriangle(context.source, context.destination);
+                return;
+            }
+
+            //Debug.Log("[FSR2] Render, where am I being called from?");  // In OnPreCull... OH
+            // TODO: executing in OnPreCull means we can do jittering in here, at least. Rect manipulation should still happen before PPV2 entirely.
+            ApplyJitter(context.camera);
+            
+            cmd.BlitFullscreenTriangle(context.source, context.destination);
+        }
+
+        /// <summary>
+        /// Inject ourselves into the camera's render loop at points where PPV2 normally wouldn't allow us.
+        /// This also sets up PPV2's own stack to use FSR2's upscaled output as its source. 
+        /// </summary>
+        private void Inject(PostProcessRenderContext context)
+        {
+            var go = context.camera.gameObject;
+            _helper = go.AddComponent<Fsr2PostProcessHelper>();
+            
+            _helper.Settings = settings;
+            // TODO: create output RT, set it as PPV2's post-transparency stack source
+        }
+        
+        private void CreateFsrContext(PostProcessRenderContext context)
+        {
+            _displaySize = new Vector2Int(context.screenWidth, context.screenHeight);
+            Fsr2.GetRenderResolutionFromQualityMode(out var renderWidth, out var renderHeight, _displaySize.x, _displaySize.y, settings.qualityMode);
+            _renderSize = new Vector2Int(renderWidth, renderHeight);
+            
+            Fsr2.InitializationFlags flags = 0;
+            if (context.camera.allowHDR) flags |= Fsr2.InitializationFlags.EnableHighDynamicRange;
+            if (settings.enableFP16) flags |= Fsr2.InitializationFlags.EnableFP16Usage;
+            if (settings.enableAutoExposure) flags |= Fsr2.InitializationFlags.EnableAutoExposure;
+
+#if UNITY_EDITOR || DEVELOPMENT_BUILD
+            flags |= Fsr2.InitializationFlags.EnableDebugChecking;
+#endif
+            
+            _fsrContext = Fsr2.CreateContext(_displaySize, _renderSize, flags);
+        }
+        
+        private void DestroyFsrContext()
+        {
+            if (_fsrContext != null)
+            {
+                _fsrContext.Destroy();
+                _fsrContext = null;
+            }
+        }
+
+        private void ApplyJitter(Camera camera)
+        {
+            // Perform custom jittering of the camera's projection matrix according to FSR2's recipe
+            int jitterPhaseCount = Fsr2.GetJitterPhaseCount(_renderSize.x, _displaySize.x);
+            Fsr2.GetJitterOffset(out float jitterX, out float jitterY, Time.frameCount, jitterPhaseCount);
+
+            jitterX = 2.0f * jitterX / _renderSize.x;
+            jitterY = 2.0f * jitterY / _renderSize.y;
+
+            var jitterTranslationMatrix = Matrix4x4.Translate(new Vector3(jitterX, jitterY, 0));
+            camera.nonJitteredProjectionMatrix = camera.projectionMatrix;
+            camera.projectionMatrix = jitterTranslationMatrix * camera.nonJitteredProjectionMatrix;
+            camera.useJitteredProjectionMatrixForTransparentRendering = true;
+        }
+    }
+
+    internal class Fsr2PostProcessHelper : MonoBehaviour
+    {
+        internal Fsr2PostProcessEffect Settings;
+
+        private Camera _camera;
+
+        private void Awake()
+        {
+            _camera = GetComponent<Camera>();
+            // TODO: inject opaque-only command buffer & anything else?
+        }
+
+        private void OnPreCull()    // TODO: may need to do this in LateUpdate instead? So we execute before PPV2's OnPreCull
+        {
+            // TODO: check if FSR2 is still enabled; if not: reset PPV2 source texture & disable self
+            // TODO: fiddle with the camera parameters, rect, jitter, etc
+            // Debug.Log("[FSR2] OnPreCull");
+        }
+
+        private void OnPostRender()
+        {
+            _camera.ResetProjectionMatrix();
+        }
+    }
+}
+#endif  // UNITY_POST_PROCESSING_STACK_V2

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