Create opaque-only color buffer copy after opaque-only post-processing is done, and use the correct color format for the copy.

This creates a more accurate opaque-only reference for the auto-reactive pass, and improves compatibility with custom opaque-only effects.

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

@@ -685,12 +685,9 @@ namespace UnityEngine.Rendering.PostProcessing
                 aoRenderer.Get().RenderAfterOpaque(context);
             }
 
-            bool fsrRequiresOpaque = context.IsSuperResolutionActive() && (superResolution.autoGenerateReactiveMask || superResolution.autoGenerateTransparencyAndComposition);
-
             bool isFogActive = fog.IsEnabledAndSupported(context);
             bool hasCustomOpaqueOnlyEffects = HasOpaqueOnlyEffects(context);
             int opaqueOnlyEffects = 0;
-            opaqueOnlyEffects += fsrRequiresOpaque ? 1 : 0;
             opaqueOnlyEffects += isScreenSpaceReflectionsActive ? 1 : 0;
             opaqueOnlyEffects += isFogActive ? 1 : 0;
             opaqueOnlyEffects += hasCustomOpaqueOnlyEffects ? 1 : 0;
@@ -715,13 +712,6 @@ namespace UnityEngine.Rendering.PostProcessing
                     UpdateSrcDstForOpaqueOnly(ref srcTarget, ref dstTarget, context, cameraTarget, opaqueOnlyEffects);
                 }
 
-                if (fsrRequiresOpaque)
-                {
-                    m_opaqueOnly = context.GetScreenSpaceTemporaryRT();
-                    cmd.BuiltinBlit(context.source, m_opaqueOnly);
-                    opaqueOnlyEffects--;
-                }
-
                 if (isScreenSpaceReflectionsActive)
                 {
                     ssrRenderer.RenderOrLog(context);
@@ -742,6 +732,13 @@ namespace UnityEngine.Rendering.PostProcessing
                 cmd.ReleaseTemporaryRT(srcTarget);
             }
             
+            // Create a copy of the opaque-only color buffer for auto-reactive mask generation
+            if (context.IsSuperResolutionActive() && (superResolution.autoGenerateReactiveMask || superResolution.autoGenerateTransparencyAndComposition))
+            {
+                m_opaqueOnly = context.GetScreenSpaceTemporaryRT(colorFormat: sourceFormat);
+                m_LegacyCmdBufferOpaque.BuiltinBlit(cameraTarget, m_opaqueOnly);
+            }
+
             // Post-transparency stack
             int tempRt = -1;
             bool forceNanKillPass = (!m_NaNKilled && stopNaNPropagation && RuntimeUtilities.isFloatingPointFormat(sourceFormat));