Simplified prepare inputs shader by removing the conditionals and the entire constant buffer

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/Upscaler.cs

@@ -19,16 +19,12 @@ namespace UnityEngine.Rendering.PostProcessing
 		
 		public abstract void Render(PostProcessRenderContext context, Upscaling config);
 
-		private ConstantsBuffer<PrepareInputsConstants> _prepareInputsConstants;
-		
 		protected bool PrepareInputs(CommandBuffer cmd, PostProcessRenderContext context, Upscaling config, RenderTexture rwColor = null, RenderTexture rwDepth = null, RenderTexture rwMotionVectors = null)
 		{
 			ComputeShader shader = context.resources.computeShaders.prepareInputs;
 			if (shader == null)
 				return false;
 
-			_prepareInputsConstants ??= ConstantsBuffer<PrepareInputsConstants>.Create();
-			
 			Vector2Int scaledRenderSize = config.GetScaledRenderSize(context.camera);
 			
 			const int threadGroupWorkRegionDim = 8;
@@ -37,11 +33,6 @@ namespace UnityEngine.Rendering.PostProcessing
 			
 			cmd.BeginSample("Prepare Inputs");
 			
-			_prepareInputsConstants.Value.prepareColor = rwColor != null ? 1 : 0;
-			_prepareInputsConstants.Value.prepareDepth = rwDepth != null ? 1 : 0;
-			_prepareInputsConstants.Value.prepareMotionVectors = rwMotionVectors != null ? 1 : 0;
-			_prepareInputsConstants.UpdateBufferData(cmd);
-			
 			int kernelIndex = shader.FindKernel("CS");
 			cmd.SetComputeTextureParam(shader, kernelIndex, "InColor", context.source, 0, RenderTextureSubElement.Color);
 			cmd.SetComputeTextureParam(shader, kernelIndex, "InDepth", Upscaling.GetDepthTexture(context.camera), 0, RenderTextureSubElement.Depth);
@@ -51,22 +42,11 @@ namespace UnityEngine.Rendering.PostProcessing
 			cmd.SetComputeTextureParam(shader, kernelIndex, "OutDepth", rwDepth != null ? rwDepth : BuiltinRenderTextureType.None);
 			cmd.SetComputeTextureParam(shader, kernelIndex, "OutMotionVectors", rwMotionVectors != null ? rwMotionVectors : BuiltinRenderTextureType.None);
 			
-			cmd.SetComputeConstantBufferParam(shader, "Params", _prepareInputsConstants, 0, Marshal.SizeOf<PrepareInputsConstants>());
-			
 			cmd.DispatchCompute(shader, kernelIndex, dispatchSrcX, dispatchSrcY, 1);
 			
 			cmd.EndSample("Prepare Inputs");
 			return true;
 		}
-		
-		[Serializable, StructLayout(LayoutKind.Sequential)]
-		internal struct PrepareInputsConstants
-		{
-			public int prepareColor;
-			public int prepareDepth;
-			public int prepareMotionVectors;
-			public int pad;
-		}
 
 		private ConstantsBuffer<GenerateReactiveConstants> _reactiveMaskConstants;
 		private RenderTexture _reactiveMask;

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Shaders/Builtins/PrepareInputs.compute

@@ -8,20 +8,12 @@ RWTexture2D<float4> OutColor: register(u0);
 RWTexture2D<float>  OutDepth: register(u1);
 RWTexture2D<float2> OutMotionVectors: register(u2);
 
-cbuffer Params: register(b0)
-{
-    int prepareColor;
-    int prepareDepth;
-    int prepareMotionVectors;
-    int pad;
-};
-
 [numthreads(8, 8, 1)]
 void CS(uint3 dtid : SV_DispatchThreadID)
 {
     uint2 InputPos = dtid.xy;
 
-    if (prepareColor) OutColor[InputPos] = InColor[InputPos];
-    if (prepareDepth) OutDepth[InputPos] = InDepth[InputPos];
-    if (prepareMotionVectors) OutMotionVectors[InputPos] = InMotionVectors[InputPos];
+    OutColor[InputPos] = InColor[InputPos];
+    OutDepth[InputPos] = InDepth[InputPos];
+    OutMotionVectors[InputPos] = InMotionVectors[InputPos];
 }