Separate out depth from the color buffer using RenderTextureSubElement, which does work now.

This whittles down the additional blitting to just motion vectors, with only a single shader/material required.

Assets/Scripts/Fsr2Controller.cs

@@ -39,21 +39,6 @@ public class Fsr2Controller : MonoBehaviour
 
     private RenderTexture _outputRT;
 
-    private Material _copyDepthMat;
-    private Material CopyDepthMaterial
-    {
-        get
-        {
-            if (_copyDepthMat == null)
-            {
-                var copyDepthShader = Fsr2.GlobalCallbacks.LoadShader("Shaders/FSR2_CopyDepth");
-                _copyDepthMat = new Material(copyDepthShader);
-            }
-
-            return _copyDepthMat;
-        }
-    }
-
     private Material _copyMotionMat;
     private Material CopyMotionVectorsMaterial
     {
@@ -126,17 +111,12 @@ public class Fsr2Controller : MonoBehaviour
     {
         var color = gameCamera.targetTexture;
         
-        // I hate having to allocate extra RTs just to duplicate already existing Unity render buffers, but AFAIK there is no way to directly address these buffers individually from code
-        var depth = RenderTexture.GetTemporary(color.width, color.height, 0, RenderTextureFormat.RFloat);
+        // I hate having to allocate extra RTs just to duplicate already existing Unity render buffers, but AFAIK there is no way to directly address motion vectors from code
         var motionVectors = RenderTexture.GetTemporary(color.width, color.height, 0, RenderTextureFormat.RGHalf);
-        
-        // TODO: might be able to combine color + depth into a single RT and separate them out using RenderTextureSubElement
-        // TODO: we can copy to all RTs at the same time using a multi-target blit, requiring only a single shader + material
-        Graphics.Blit(color, depth, CopyDepthMaterial);
         Graphics.Blit(color, motionVectors, CopyMotionVectorsMaterial);
 
         _dispatchDescription.Color = color;
-        _dispatchDescription.Depth = depth;
+        _dispatchDescription.Depth = color;
         _dispatchDescription.MotionVectors = motionVectors;
         _dispatchDescription.Output = _outputRT;
         _dispatchDescription.Exposure = null;
@@ -154,7 +134,6 @@ public class Fsr2Controller : MonoBehaviour
 
         _context.Dispatch(_dispatchDescription);
         
-        RenderTexture.ReleaseTemporary(depth);
         RenderTexture.ReleaseTemporary(motionVectors);
         
         // Output upscaled image to screen

Assets/Scripts/Fsr2Pipeline.cs

@@ -173,7 +173,7 @@ namespace FidelityFX
             // - How do we clear the resources that need to be cleared at dispatch? (SetBufferData)
             // - Shouldn't we use a ComputeBuffer for resources that are one-dimensional and clearly not image data? e.g. SPD atomic counter & Lanczos LUT data
 
-            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputColor, dispatchParams.Color);
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputColor, dispatchParams.Color, 0, RenderTextureSubElement.Color);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, UavAutoExposure, _autoExposure);
             commandBuffer.SetComputeConstantBufferParam(ComputeShader, CbFsr2, Constants, 0, Marshal.SizeOf<Fsr2.Fsr2Constants>());
             commandBuffer.SetComputeConstantBufferParam(ComputeShader, CbSpd, _spdConstants, 0, Marshal.SizeOf<Fsr2.SpdConstants>());
@@ -196,8 +196,8 @@ namespace FidelityFX
 
         public override void ScheduleDispatch(CommandBuffer commandBuffer, Fsr2.DispatchDescription dispatchParams, int frameIndex, int dispatchX, int dispatchY)
         {
-            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputColor, dispatchParams.Color);
-            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputDepth, dispatchParams.Depth);
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputColor, dispatchParams.Color, 0, RenderTextureSubElement.Color);
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputDepth, dispatchParams.Depth, 0, RenderTextureSubElement.Depth);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputMotionVectors, dispatchParams.MotionVectors);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputExposure, dispatchParams.Exposure);
             
@@ -228,8 +228,8 @@ namespace FidelityFX
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvTransparencyAndCompositionMask, dispatchParams.Reactive);   // Default reactive mask, as we don't support TCR (yet)
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvPrevDilatedMotionVectors, _dilatedMotionVectors[frameIndex ^ 1]);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputMotionVectors, dispatchParams.MotionVectors);
-            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputColor, dispatchParams.Color);
-            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputDepth, dispatchParams.Depth);
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputColor, dispatchParams.Color, 0, RenderTextureSubElement.Color);
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputDepth, dispatchParams.Depth, 0, RenderTextureSubElement.Depth);
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputExposure, dispatchParams.Exposure);
 
             commandBuffer.SetComputeConstantBufferParam(ComputeShader, CbFsr2, Constants, 0, Marshal.SizeOf<Fsr2.Fsr2Constants>());
@@ -318,7 +318,7 @@ namespace FidelityFX
         {
             // Run the RCAS sharpening filter on the upscaled image
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvInputExposure, dispatchParams.Exposure);
-            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvRcasInput, dispatchParams.Color);   // TODO: should be output from accumulate pass
+            commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, SrvRcasInput, dispatchParams.Color, 0, RenderTextureSubElement.Color);   // TODO: should be output from accumulate pass
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, UavUpscaledOutput, dispatchParams.Output);
             commandBuffer.SetComputeConstantBufferParam(ComputeShader, CbFsr2, Constants, 0, Marshal.SizeOf<Fsr2.Fsr2Constants>());
             commandBuffer.SetComputeConstantBufferParam(ComputeShader, CbRcas, _rcasConstants, 0, Marshal.SizeOf<Fsr2.RcasConstants>());