Fixed incorrect scaled render size during FSR dispatch because of course, global variables and side-effects are bad m'kay.

At least dynamic scaling works now, so we can go from here.

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

@@ -294,7 +294,7 @@ namespace UnityEngine.Rendering.PostProcessing
             _dispatchDescription.MotionVectorScale.x = -scaledRenderSize.x;
             _dispatchDescription.MotionVectorScale.y = -scaledRenderSize.y;
             _dispatchDescription.RenderSize = scaledRenderSize;
-            _dispatchDescription.InputResourceSize = scaledRenderSize;
+            _dispatchDescription.InputResourceSize = _maxRenderSize;
             _dispatchDescription.FrameTimeDelta = Time.unscaledDeltaTime;
             _dispatchDescription.CameraNear = camera.nearClipPlane;
             _dispatchDescription.CameraFar = camera.farClipPlane;

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/PostProcessLayer.cs

@@ -1188,17 +1188,20 @@ namespace UnityEngine.Rendering.PostProcessing
                     
                     // Set the upscaler's output to full display resolution, as well as for all following post-processing effects
                     context.SetRenderSize(superResolution.displaySize);
-                    RuntimeUtilities.EnableDynamicResolution = false;
-                    
+
                     var fsrTarget = m_TargetPool.Get();
                     var finalDestination = context.destination;
+                    RuntimeUtilities.EnableDynamicResolution = false;
                     context.GetScreenSpaceTemporaryRT(cmd, fsrTarget, 0, context.sourceFormat, enableRandomWrite: true);
                     context.destination = fsrTarget;
                     superResolution.colorOpaqueOnly = m_opaqueOnly;
+                    RuntimeUtilities.EnableDynamicResolution = true;
                     superResolution.Render(context);
                     context.source = fsrTarget;
                     context.destination = finalDestination;
                     
+                    RuntimeUtilities.EnableDynamicResolution = false;
+                    
                     if (lastTarget > -1)
                         cmd.ReleaseTemporaryRT(lastTarget);