Fixed useless editor repaint when using lod bias (#2601)

Co-authored-by: sebastienlagarde <[email protected]>

Author: adrien-de-tocqueville

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

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 - Fixed probe volumes debug views.
 - Fixed issue displaying wrong debug mode in runtime debug menu UI.
+- Fixed useless editor repaint when using lod bias.
+- Fixed multi-editing with new light intensity slider.
 
 ## [10.2.0] - 2020-10-19
 
@@ -101,7 +103,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed picking for materials with depth offset.
 - Fixed issue with exposure history being uninitialized on second frame.
 - Fixed issue when changing FoV with the physical camera fold-out closed.
-- Fixed multi-editing with new light intensity slider.
 
 ### Changed
 - Combined occlusion meshes into one to reduce draw calls and state changes with XR single-pass.

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

@@ -3332,8 +3332,13 @@ ref HDCullingResults cullingResults
             var initialMaximumLODLevel = QualitySettings.maximumLODLevel;
             try
             {
+#if UNITY_2021_1_OR_NEWER
+                // Modifying the variables this way does not set the dirty flag, which avoids repainting all views
+                QualitySettings.SetLODSettings(hdCamera.frameSettings.GetResolvedLODBias(hdrp), hdCamera.frameSettings.GetResolvedMaximumLODLevel(hdrp), false);
+#else
                 QualitySettings.lodBias = hdCamera.frameSettings.GetResolvedLODBias(hdrp);
                 QualitySettings.maximumLODLevel = hdCamera.frameSettings.GetResolvedMaximumLODLevel(hdrp);
+#endif
 
                 // This needs to be called before culling, otherwise in the case where users generate intermediate renderers, it can provoke crashes.
                 BeginCameraRendering(renderContext, camera);
@@ -3397,8 +3402,12 @@ ref HDCullingResults cullingResults
             }
             finally
             {
+#if UNITY_2021_1_OR_NEWER
+                QualitySettings.SetLODSettings(initialLODBias, initialMaximumLODLevel, false);
+#else
                 QualitySettings.lodBias = initialLODBias;
                 QualitySettings.maximumLODLevel = initialMaximumLODLevel;
+#endif
             }
         }