Implemented auto-exposure feature.

The way this works: compute luminance always outputs an auto-exposure value. The passes using exposure as input can either use this auto-exposure, or use the default read-only exposure value, or use an application-provided exposure.

Assets/Scenes/SampleScene.unity

@@ -316,9 +316,10 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 955cb66a9ecc20441a7e32934c9b4690, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  qualityMode: 3
+  qualityMode: 2
   performSharpenPass: 1
   sharpness: 0.8
+  enableAutoExposure: 1
   enableFP16: 0
   reactiveMask: {fileID: 0}
   transparencyAndCompositionMask: {fileID: 0}

Assets/Scripts/Fsr2Context.cs

@@ -130,8 +130,12 @@ namespace FidelityFX
             bool resetAccumulation = dispatchParams.Reset || _firstExecution;
             _firstExecution = false;
 
-            // TODO: auto-exposure flag
-            if (dispatchParams.Exposure == null) dispatchParams.Exposure = _resources.DefaultExposure;
+            // if auto exposure is enabled use the auto exposure SRV, otherwise what the app sends.
+            if ((_contextDescription.Flags & Fsr2.InitializationFlags.EnableAutoExposure) != 0)
+                dispatchParams.Exposure = _resources.AutoExposure;
+            else if (dispatchParams.Exposure == null) 
+                dispatchParams.Exposure = _resources.DefaultExposure;
+            
             if (dispatchParams.Reactive == null) dispatchParams.Reactive = _resources.DefaultReactive;
             if (dispatchParams.TransparencyAndComposition == null) dispatchParams.TransparencyAndComposition = _resources.DefaultReactive;
             Fsr2Pipeline.RegisterResources(commandBuffer, _contextDescription, dispatchParams);
@@ -347,8 +351,7 @@ namespace FidelityFX
             spdConstants.renderSizeY = (uint)dispatchParams.RenderSize.y;
         }
 
-        private static void SpdSetup(RectInt rectInfo, 
-            out Vector2Int dispatchThreadGroupCount, out Vector2Int workGroupOffset, out Vector2Int numWorkGroupsAndMips, int mips = -1)
+        private static void SpdSetup(RectInt rectInfo, out Vector2Int dispatchThreadGroupCount, out Vector2Int workGroupOffset, out Vector2Int numWorkGroupsAndMips, int mips = -1)
         {
             workGroupOffset = new Vector2Int(rectInfo.x / 64, rectInfo.y / 64);
 
@@ -367,7 +370,7 @@ namespace FidelityFX
 
         private void DebugCheckDispatch(Fsr2.DispatchDescription dispatchParams)
         {
-            // Global texture binding may happen as part of the command list, which is why we check these after running the process at least once
+            // Global texture binding may be queued as part of the command list, which is why we check these after running the process at least once
             if (!_firstExecution)
             {
                 if (!dispatchParams.Color.HasValue && Shader.GetGlobalTexture(Fsr2Pipeline.SrvInputColor) == null)
@@ -443,7 +446,7 @@ namespace FidelityFX
 
                 if (infiniteDepth)
                 {
-                    if (dispatchParams.CameraNear != float.MaxValue)
+                    if (dispatchParams.CameraNear < float.MaxValue)
                     {
                         Debug.LogWarning("EnableDepthInfinite and EnableDepthInverted present, yet CameraNear != float.MaxValue");
                     }
@@ -463,7 +466,7 @@ namespace FidelityFX
 
                 if (infiniteDepth)
                 {
-                    if (dispatchParams.CameraFar != float.MaxValue)
+                    if (dispatchParams.CameraFar < float.MaxValue)
                     {
                         Debug.LogWarning("EnableDepthInfinite present, yet CameraFar != float.MaxValue");
                     }

Assets/Scripts/Fsr2Controller.cs

@@ -17,6 +17,8 @@ namespace FidelityFX
         
         public bool performSharpenPass = true;
         [Range(0, 1)] public float sharpness = 0.8f;
+
+        public bool enableAutoExposure = false;
         
         [Tooltip("Allow the use of half precision compute operations, potentially improving performance")]
         public bool enableFP16 = false;
@@ -67,9 +69,9 @@ namespace FidelityFX
             
             // Initialize FSR2 context
             Fsr2.InitializationFlags flags = 0;
-            if (enableFP16)
-                flags |= Fsr2.InitializationFlags.EnableFP16Usage;
-            
+            if (enableAutoExposure) flags |= Fsr2.InitializationFlags.EnableAutoExposure;
+            if (enableFP16) flags |= Fsr2.InitializationFlags.EnableFP16Usage;
+
 #if UNITY_EDITOR || DEVELOPMENT_BUILD
             flags |= Fsr2.InitializationFlags.EnableDebugChecking;
 #endif