Changed atomic counter from a temporary RT to a permanent one, and set it to 0 only on the first frame. Potential fix for auto-exposure on MacOS.

Assets/Scripts/Core/Fsr2Context.cs

@@ -150,6 +150,10 @@ namespace FidelityFX
                 commandBuffer.ClearRenderTarget(false, true, Color.clear);
                 commandBuffer.SetRenderTarget(_resources.LockStatus[1]);
                 commandBuffer.ClearRenderTarget(false, true, Color.clear);
+                
+                // Reset atomic counter to 0
+                commandBuffer.SetRenderTarget(_resources.SpdAtomicCounter);
+                commandBuffer.ClearRenderTarget(false, true, Color.clear);
             }
             
             int frameIndex = _resourceFrameIndex % 2;
@@ -207,10 +211,6 @@ namespace FidelityFX
                 commandBuffer.ClearRenderTarget(false, true, new Color(-1f, 1e8f, 0f, 0f));
             }
             
-            // Reset atomic counter to 0
-            commandBuffer.SetRenderTarget(Fsr2ShaderIDs.UavSpdAtomicCount);
-            commandBuffer.ClearRenderTarget(false, true, Color.clear);
-            
             // Auto exposure
             SetupSpdConstants(dispatchParams, out var dispatchThreadGroupCount);
             

Assets/Scripts/Core/Fsr2Pipeline.cs

@@ -66,9 +66,6 @@ namespace FidelityFX
             // Set up shared aliasable resources, i.e. temporary render textures
             // These do not need to persist between frames, but they do need to be available between passes
             
-            // Resource FSR2_SpdAtomicCounter: FFX_RESOURCE_USAGE_UAV, FFX_SURFACE_FORMAT_R32_UINT, FFX_RESOURCE_FLAGS_ALIASABLE
-            commandBuffer.GetTemporaryRT(Fsr2ShaderIDs.UavSpdAtomicCount, 1, 1, 0, default, GraphicsFormat.R32_UInt, 1, true);
-            
             // FSR2_ReconstructedPrevNearestDepth: FFX_RESOURCE_USAGE_UAV, FFX_SURFACE_FORMAT_R32_UINT, FFX_RESOURCE_FLAGS_ALIASABLE
             commandBuffer.GetTemporaryRT(Fsr2ShaderIDs.UavReconstructedPrevNearestDepth, maxRenderSize.x, maxRenderSize.y, 0, default, GraphicsFormat.R32_UInt, 1, true);
 
@@ -91,7 +88,6 @@ namespace FidelityFX
         public static void UnregisterResources(CommandBuffer commandBuffer)
         {
             // Release all of the aliasable resources used this frame
-            commandBuffer.ReleaseTemporaryRT(Fsr2ShaderIDs.UavSpdAtomicCount);
             commandBuffer.ReleaseTemporaryRT(Fsr2ShaderIDs.UavReconstructedPrevNearestDepth);
             commandBuffer.ReleaseTemporaryRT(Fsr2ShaderIDs.UavDilatedDepth);
             commandBuffer.ReleaseTemporaryRT(Fsr2ShaderIDs.UavLockInputLuma);
@@ -175,6 +171,7 @@ namespace FidelityFX
             if (dispatchParams.Color.HasValue)
                 commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, Fsr2ShaderIDs.SrvInputColor, dispatchParams.Color.Value, 0, RenderTextureSubElement.Color);
 
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, Fsr2ShaderIDs.UavSpdAtomicCount, Resources.SpdAtomicCounter);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, Fsr2ShaderIDs.UavExposureMipLumaChange, Resources.SceneLuminance, ShadingChangeMipLevel);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, Fsr2ShaderIDs.UavExposureMip5, Resources.SceneLuminance, 5);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, Fsr2ShaderIDs.UavAutoExposure, Resources.AutoExposure);

Assets/Scripts/Core/Fsr2Resources.cs

@@ -34,6 +34,7 @@ namespace FidelityFX
         public Texture2D DefaultReactive;
         public Texture2D LanczosLut;
         public Texture2D MaximumBiasLut;
+        public RenderTexture SpdAtomicCounter;
         public RenderTexture AutoExposure;
         public RenderTexture SceneLuminance;
         public RenderTexture AutoReactive;
@@ -84,6 +85,10 @@ namespace FidelityFX
             DefaultReactive.SetPixel(0, 0, Color.clear);
             DefaultReactive.Apply();
             
+            // Resource FSR2_SpdAtomicCounter: FFX_RESOURCE_USAGE_UAV, FFX_SURFACE_FORMAT_R32_UINT, FFX_RESOURCE_FLAGS_ALIASABLE
+            SpdAtomicCounter = new RenderTexture(1, 1, 0, GraphicsFormat.R32_UInt) { name = "FSR2_SpdAtomicCounter", enableRandomWrite = true };
+            SpdAtomicCounter.Create();
+
             // Resource FSR2_AutoExposure: FFX_RESOURCE_USAGE_UAV, FFX_SURFACE_FORMAT_R32G32_FLOAT, FFX_RESOURCE_FLAGS_NONE
             AutoExposure = new RenderTexture(1, 1, 0, GraphicsFormat.R32G32_SFloat) { name = "FSR2_AutoExposure", enableRandomWrite = true };
             AutoExposure.Create();