HDRenderLoop: Fix error with DestroyBuffer

Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/SinglePass/SinglePass.cs

                 return "LIGHTLOOP_SINGLE_PASS";
             }
 
-            ComputeBuffer m_punctualLightList;
-            ComputeBuffer m_envLightList;
-            ComputeBuffer m_areaLightList;
-            ComputeBuffer m_punctualShadowList;
+            // Static keyword is required here else we get a "DestroyBuffer can only be call in main thread"
+            static ComputeBuffer s_PunctualLightList;
+            static ComputeBuffer s_EnvLightList;
+            static ComputeBuffer s_AreaLightList;
+            static ComputeBuffer s_PunctualShadowList;
-                if (m_punctualLightList != null)
-                    m_punctualLightList.Release();
+                if (s_PunctualLightList != null)
+                    s_PunctualLightList.Release();
-                if (m_areaLightList != null)
-                    m_areaLightList.Release();
+                if (s_AreaLightList != null)
+                    s_AreaLightList.Release();
-                if (m_punctualShadowList != null)
-                    m_punctualShadowList.Release();
+                if (s_PunctualShadowList != null)
+                    s_PunctualShadowList.Release();
-                if (m_envLightList != null)
-                    m_envLightList.Release();
+                if (s_EnvLightList != null)
+                    s_EnvLightList.Release();
             }
 
             public void Rebuild()
-                m_punctualLightList = new ComputeBuffer(HDRenderLoop.k_MaxPunctualLightsOnSCreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(PunctualLightData)));
-                m_areaLightList = new ComputeBuffer(HDRenderLoop.k_MaxAreaLightsOnSCreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(AreaLightData)));
-                m_envLightList = new ComputeBuffer(HDRenderLoop.k_MaxEnvLightsOnSCreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(EnvLightData)));
-                m_punctualShadowList = new ComputeBuffer(HDRenderLoop.k_MaxShadowOnScreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(PunctualShadowData)));
+                s_PunctualLightList = new ComputeBuffer(HDRenderLoop.k_MaxPunctualLightsOnSCreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(PunctualLightData)));
+                s_AreaLightList = new ComputeBuffer(HDRenderLoop.k_MaxAreaLightsOnSCreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(AreaLightData)));
+                s_EnvLightList = new ComputeBuffer(HDRenderLoop.k_MaxEnvLightsOnSCreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(EnvLightData)));
+                s_PunctualShadowList = new ComputeBuffer(HDRenderLoop.k_MaxShadowOnScreen, System.Runtime.InteropServices.Marshal.SizeOf(typeof(PunctualShadowData)));
-                m_punctualLightList.Release();
-                m_areaLightList.Release();
-                m_envLightList.Release();
-                m_punctualShadowList.Release();
+                s_PunctualLightList.Release();
+                s_PunctualLightList = null;
+                s_AreaLightList.Release();
+                s_AreaLightList = null;
+                s_EnvLightList.Release();
+                s_EnvLightList = null;
+                s_PunctualShadowList.Release();
+                s_PunctualShadowList = null;
-                m_punctualLightList.SetData(lightList.punctualLights.ToArray());
-                m_areaLightList.SetData(lightList.areaLights.ToArray());
-                m_envLightList.SetData(lightList.envLights.ToArray());
-                m_punctualShadowList.SetData(lightList.punctualShadows.ToArray());
+                s_PunctualLightList.SetData(lightList.punctualLights.ToArray());
+                s_AreaLightList.SetData(lightList.areaLights.ToArray());
+                s_EnvLightList.SetData(lightList.envLights.ToArray());
+                s_PunctualShadowList.SetData(lightList.punctualShadows.ToArray());
-                Shader.SetGlobalBuffer("_PunctualLightList", m_punctualLightList);
+                Shader.SetGlobalBuffer("_PunctualLightList", s_PunctualLightList);
-                Shader.SetGlobalBuffer("_AreaLightList", m_areaLightList);
+                Shader.SetGlobalBuffer("_AreaLightList", s_AreaLightList);
-                Shader.SetGlobalBuffer("_PunctualShadowList", m_punctualShadowList);
-                Shader.SetGlobalBuffer("_EnvLightList", m_envLightList);
+                Shader.SetGlobalBuffer("_PunctualShadowList", s_PunctualShadowList);
+                Shader.SetGlobalBuffer("_EnvLightList", s_EnvLightList);
                 Shader.SetGlobalInt("_EnvLightCount", lightList.envLights.Count);         
             }
         }

Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/TilePass/TilePass.cs

                 /*
                 ClearComputeBuffers();
 
-                buildScreenAABBShader = Resources.Load<ComputeShader>("srcbound");
+                buildScreenAABBShader = Resources.Load<ComputeShader>("scrbound");
                 buildPerTileLightListShader = Resources.Load<ComputeShader>("lightlistbuild");
                 buildPerBigTileLightListShader = Resources.Load<ComputeShader>("lightlistbuild-bigtile");
                 buildPerVoxelLightListShader = Resources.Load<ComputeShader>("lightlistbuild-clustered");