Merge pull request #1680 from Unity-Technologies/Branch_FixPPCopy

Branch fix pp copy

com.unity.render-pipelines.high-definition/CHANGELOG.md

 - Fixed an issue with distortion that was using previous frame instead of current frame
 - Fixed an issue where disabled light where not upgrade correctly to the new physical light unit system introduce in 2.0.5-preview
 - Fixed an issue with PreIntegratedFGD texture being sometimes destroyed and not regenerated causing rendering to break
+- PostProcess input buffers are not copied anymore on PC if the viewport size matches the final render target size
 
 ## [2.0.5-preview]
 

com.unity.render-pipelines.high-definition/HDRP/RenderPipeline/HDRenderPipeline.cs

                 RenderTargetIdentifier source = m_CameraColorBuffer;
 
                 // For console we are not allowed to resize the windows, so don't use our hack.
-                bool tempHACK = !IsConsolePlatform();
+                // We also don't do the copy if viewport size and render texture size match.
+                bool viewportAndRTSameSize = (hdcamera.actualWidth == m_CameraColorBuffer.rt.width && hdcamera.actualHeight == m_CameraColorBuffer.rt.height);
+                bool tempHACK = !IsConsolePlatform() && !viewportAndRTSameSize;
 
                 if (tempHACK)
                 {