- Use non-jittered camera projection matrix

- Double checked jitter offset values
- Use prepared (i.e. copied) motion vector texture

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

@@ -14,6 +14,7 @@ namespace UnityEngine.Rendering.PostProcessing
 
 		private RenderTexture _inputColor;
 		private RenderTexture _inputDepth;
+		private RenderTexture _inputMotionVectors;
 		private RenderTexture _outputColor;
 		private Texture2D _outputIntermediate;
 		
@@ -39,6 +40,7 @@ namespace UnityEngine.Rendering.PostProcessing
 
 			CreateRenderTexture(ref _inputColor, "PSSR Input Color", config.MaxRenderSize, context.sourceFormat, true);
 			CreateRenderTexture(ref _inputDepth, "PSSR Input Depth", config.MaxRenderSize, GraphicsFormat.R32_SFloat, true);
+			CreateRenderTexture(ref _inputMotionVectors, "PSSR Input Motion Vectors", config.MaxRenderSize, GraphicsFormat.R16G16_SFloat, true);
 			CreateRenderTexture(ref _outputColor, "PSSR Output Color", config.UpscaleSize, RenderTextureFormat.RGB111110Float);
 
 			if (PSSRPlugin.CreatePssrContext(ref initParams, out IntPtr outputColorTexturePtr) >= 0 && outputColorTexturePtr != IntPtr.Zero)
@@ -83,8 +85,6 @@ namespace UnityEngine.Rendering.PostProcessing
 			}
 		}
 
-		private static readonly int CameraMotionVectorsTexture = Shader.PropertyToID("_CameraMotionVectorsTexture");
-
 		public override void Render(PostProcessRenderContext context, Upscaling config)
 		{
 			var cmd = context.command;
@@ -97,11 +97,11 @@ namespace UnityEngine.Rendering.PostProcessing
 			cmd.BeginSample("PSSR");
 			
 			// TODO: if PSSR needs a copy of the previous depth and motion vectors anyway, why not just double-buffer those resources ourselves and make good use of these otherwise dumb copies?
-			PrepareInputs(cmd, context, config, _inputColor, _inputDepth);
+			PrepareInputs(cmd, context, config, _inputColor, _inputDepth, _inputMotionVectors);
 			
 			_dispatchParams.color = ToNativePtr(_inputColor);
 			_dispatchParams.depth = ToNativePtr(_inputDepth);
-			_dispatchParams.motionVectors = ToNativePtr(Shader.GetGlobalTexture(CameraMotionVectorsTexture));
+			_dispatchParams.motionVectors = ToNativePtr(_inputMotionVectors);
 			_dispatchParams.exposure = ToNativePtr(config.exposureSource switch
 			{
 				Upscaling.ExposureSource.Manual when config.exposure != null => config.exposure,
@@ -114,7 +114,7 @@ namespace UnityEngine.Rendering.PostProcessing
 			var scaledRenderSize = config.GetScaledRenderSize(context.camera);
 			_dispatchParams.renderWidth = (uint)scaledRenderSize.x;
 			_dispatchParams.renderHeight = (uint)scaledRenderSize.y;
-			_dispatchParams.jitter = config.JitterOffset;		// TODO: may need to scale this (should be jitter in render pixels apparently)
+			_dispatchParams.jitter = config.JitterOffset;
 			_dispatchParams.motionVectorScale = new Vector2(-scaledRenderSize.x, -scaledRenderSize.y);
 			_dispatchParams.FromCamera(context.camera);
 			_dispatchParams.preExposure = config.preExposure;
@@ -178,7 +178,7 @@ namespace UnityEngine.Rendering.PostProcessing
 				public Vector2 jitter;
 				public Vector2 motionVectorScale;
 
-				public Matrix4x4 camProjection;
+				public Matrix4x4 camProjectionNoJitter;
 				public Vector3 camForward;
 				public Vector3 camUp;
 				public Vector3 camRight;
@@ -194,7 +194,7 @@ namespace UnityEngine.Rendering.PostProcessing
 
 				public void FromCamera(Camera cam)
 				{
-					camProjection = cam.projectionMatrix;
+					camProjectionNoJitter = cam.nonJitteredProjectionMatrix;
 					camForward = cam.transform.forward;
 					camUp = cam.transform.up;
 					camRight = cam.transform.right;

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

@@ -2,11 +2,11 @@
 
 Texture2D           InColor: register(t0);
 Texture2D<float>    InDepth: register(t1);
-//Texture2D<float2>   InMotionVectors: register(t2);
+Texture2D<float2>   InMotionVectors: register(t2);
 
 RWTexture2D<float4> OutColor: register(u0);
 RWTexture2D<float>  OutDepth: register(u1);
-//RWTexture2D<float2> OutMotionVectors: register(u2);
+RWTexture2D<float2> OutMotionVectors: register(u2);
 
 cbuffer Params: register(b0)
 {
@@ -23,5 +23,5 @@ void CS(uint2 GroupId: SV_GroupID, uint2 GroupThreadId: SV_GroupThreadID)
 
     if (prepareColor) OutColor[InputPos] = InColor[InputPos];
     if (prepareDepth) OutDepth[InputPos] = InDepth[InputPos];
-    //if (prepareMotionVectors) OutMotionVectors[InputPos] = InMotionVectors[InputPos];
+    if (prepareMotionVectors) OutMotionVectors[InputPos] = InMotionVectors[InputPos];
 }