SwitchActiveTexturesToBackbuffer for URP

Author: UnityAljosha

Packages/com.unity.render-pipelines.universal/Runtime/FrameData/UniversalResourceData.cs

@@ -36,6 +36,19 @@ public TextureHandle activeColorTexture
             }
         }
 
+        /// <summary>
+        /// Switch the active color and depth texture to the backbuffer. Once switched, isActiveTargetBackBuffer will return true.
+        /// The activeColorTexture and activeDepthTexture will then return the backbuffer. This should be called after a render pass
+        /// that blits/copies the cameraColor to the backbuffer is recorded in the render graph. The following passes will then 
+        /// automatically use the backbuffer as active color and depth. URP will not add the final blit pass if this method is called before
+        /// that render pass.
+        /// </summary>
+        public void SwitchActiveTexturesToBackbuffer()
+        {
+            activeColorID = UniversalResourceData.ActiveID.BackBuffer;
+            activeDepthID = UniversalResourceData.ActiveID.BackBuffer;
+        }
+
         /// <summary>
         /// The active depth target ID.
         /// </summary>

Packages/com.unity.render-pipelines.universal/Runtime/UniversalRendererRenderGraph.cs

@@ -1430,8 +1430,7 @@ private void OnAfterRendering(RenderGraph renderGraph, bool applyPostProcessing)
 
                 if (isTargetBackbuffer)
                 {
-                    resourceData.activeColorID = UniversalResourceData.ActiveID.BackBuffer;
-                    resourceData.activeDepthID = UniversalResourceData.ActiveID.BackBuffer;
+                    resourceData.SwitchActiveTexturesToBackbuffer();
                 }
             }
 
@@ -1460,8 +1459,7 @@ private void OnAfterRendering(RenderGraph renderGraph, bool applyPostProcessing)
                 var source = resourceData.cameraColor;
                 m_PostProcessPassRenderGraph.RenderFinalPassRenderGraph(renderGraph, frameData, in source, in overlayUITexture, in target, needsColorEncoding);
 
-                resourceData.activeColorID = UniversalResourceData.ActiveID.BackBuffer;
-                resourceData.activeDepthID = UniversalResourceData.ActiveID.BackBuffer;
+                resourceData.SwitchActiveTexturesToBackbuffer();
             }
 
             bool cameraTargetResolved =
@@ -1488,8 +1486,7 @@ private void OnAfterRendering(RenderGraph renderGraph, bool applyPostProcessing)
                 debugHandler?.UpdateShaderGlobalPropertiesForFinalValidationPass(renderGraph, cameraData, !resolveToDebugScreen);
 
                 m_FinalBlitPass.Render(renderGraph, frameData, cameraData, source, target, overlayUITexture);
-                resourceData.activeColorID = UniversalResourceData.ActiveID.BackBuffer;
-                resourceData.activeDepthID = UniversalResourceData.ActiveID.BackBuffer;
+                resourceData.SwitchActiveTexturesToBackbuffer();
             }
 
             // TODO RENDERGRAPH: we need to discuss and decide if RenderPassEvent.AfterRendering injected passes should only be called after the last camera in the stack