GC fix for LightLoopSettings

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/LightLoopSettings.cs

 using System;
-using UnityEngine;
-
 namespace UnityEngine.Experimental.Rendering.HDPipeline
 {
     [Serializable]
         }
 
         // aggregateFrameSettings already contain the aggregation of RenderPipelineSettings and FrameSettings (regular and/or debug)
-        static public LightLoopSettings InitializeLightLoopSettings(Camera camera, FrameSettings aggregateFrameSettings,
-                                                                    RenderPipelineSettings renderPipelineSettings, FrameSettings frameSettings)
+        public static void InitializeLightLoopSettings(Camera camera, FrameSettings aggregateFrameSettings,
+                                                                    RenderPipelineSettings renderPipelineSettings, FrameSettings frameSettings,
+                                                                    ref LightLoopSettings dstLightLoopSettings)
-            LightLoopSettings aggregate = new LightLoopSettings();
+            if (dstLightLoopSettings == null)
+                dstLightLoopSettings = new LightLoopSettings();
-            aggregate.enableTileAndCluster          = frameSettings.lightLoopSettings.enableTileAndCluster;
-            aggregate.enableComputeLightEvaluation  = frameSettings.lightLoopSettings.enableComputeLightEvaluation;
-            aggregate.enableComputeLightVariants    = frameSettings.lightLoopSettings.enableComputeLightVariants;
-            aggregate.enableComputeMaterialVariants = frameSettings.lightLoopSettings.enableComputeMaterialVariants;
-            aggregate.enableFptlForForwardOpaque    = frameSettings.lightLoopSettings.enableFptlForForwardOpaque;
-            aggregate.enableBigTilePrepass          = frameSettings.lightLoopSettings.enableBigTilePrepass;
+            dstLightLoopSettings.enableTileAndCluster          = frameSettings.lightLoopSettings.enableTileAndCluster;
+            dstLightLoopSettings.enableComputeLightEvaluation  = frameSettings.lightLoopSettings.enableComputeLightEvaluation;
+            dstLightLoopSettings.enableComputeLightVariants    = frameSettings.lightLoopSettings.enableComputeLightVariants;
+            dstLightLoopSettings.enableComputeMaterialVariants = frameSettings.lightLoopSettings.enableComputeMaterialVariants;
+            dstLightLoopSettings.enableFptlForForwardOpaque    = frameSettings.lightLoopSettings.enableFptlForForwardOpaque;
+            dstLightLoopSettings.enableBigTilePrepass          = frameSettings.lightLoopSettings.enableBigTilePrepass;
-            aggregate.enableFptlForForwardOpaque = aggregate.enableFptlForForwardOpaque && aggregateFrameSettings.enableMSAA;
+            dstLightLoopSettings.enableFptlForForwardOpaque = dstLightLoopSettings.enableFptlForForwardOpaque && aggregateFrameSettings.enableMSAA;
-            aggregate.isFptlEnabled = !aggregateFrameSettings.enableForwardRenderingOnly || aggregate.enableFptlForForwardOpaque;
-
-            return aggregate;
+            dstLightLoopSettings.isFptlEnabled = !aggregateFrameSettings.enableForwardRenderingOnly || dstLightLoopSettings.enableFptlForForwardOpaque;
         }
 
         static public void RegisterDebug(String menuName, LightLoopSettings lightLoopSettings)

ScriptableRenderPipeline/HDRenderPipeline/HDRP/RenderPipeline/FrameSettings.cs

 
         // Init a FrameSettings from renderpipeline settings, frame settings and debug settings (if any)
         // This will aggregate the various option
-        public static FrameSettings InitializeFrameSettings(Camera camera, RenderPipelineSettings renderPipelineSettings, FrameSettings srcFrameSettings, ref FrameSettings dstFrameSettings)
+        public static void InitializeFrameSettings(Camera camera, RenderPipelineSettings renderPipelineSettings, FrameSettings srcFrameSettings, ref FrameSettings dstFrameSettings)
         {
             if (dstFrameSettings == null)
                 dstFrameSettings = new FrameSettings();
 
             dstFrameSettings.enableShadowMask = srcFrameSettings.enableShadowMask && renderPipelineSettings.supportShadowMask;
 
-            dstFrameSettings.lightLoopSettings = LightLoopSettings.InitializeLightLoopSettings(camera, dstFrameSettings, renderPipelineSettings, srcFrameSettings);
-
-            return dstFrameSettings;
+            LightLoopSettings.InitializeLightLoopSettings(camera, dstFrameSettings, renderPipelineSettings, srcFrameSettings, ref dstFrameSettings.lightLoopSettings);
         }
 
         static public void RegisterDebug(String menuName, FrameSettings frameSettings)