HDRenderPipeline: Disable Unused camera draw mode

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

 using System.Diagnostics;
 using System.Linq;
 using UnityEngine.Rendering.PostProcessing;
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEditor.Experimental.Rendering;
+#endif
 
 namespace UnityEngine.Experimental.Rendering.HDPipeline
 {
         }
     }
 
+#if UNITY_EDITOR
+    public class SceneViewDrawMode
+    {
+        static private bool RejectDrawMode(SceneView.CameraMode cameraMode)
+        {
+            if (cameraMode.drawMode == DrawCameraMode.TexturedWire ||
+                cameraMode.drawMode == DrawCameraMode.ShadowCascades ||
+                cameraMode.drawMode == DrawCameraMode.RenderPaths ||
+                cameraMode.drawMode == DrawCameraMode.AlphaChannel ||
+                cameraMode.drawMode == DrawCameraMode.Overdraw ||
+                cameraMode.drawMode == DrawCameraMode.Mipmaps ||
+                cameraMode.drawMode == DrawCameraMode.DeferredDiffuse ||
+                cameraMode.drawMode == DrawCameraMode.DeferredSpecular ||
+                cameraMode.drawMode == DrawCameraMode.DeferredSmoothness ||
+                cameraMode.drawMode == DrawCameraMode.DeferredNormal ||
+                cameraMode.drawMode == DrawCameraMode.ValidateAlbedo ||
+                cameraMode.drawMode == DrawCameraMode.ValidateMetalSpecular ||
+                cameraMode.drawMode == DrawCameraMode.ShadowMasks ||
+                cameraMode.drawMode == DrawCameraMode.LightOverlap
+                )
+                return false;
+
+            return true;
+        }
+
+        static public void SetupDrawMode()
+        {
+            SceneView sceneView = EditorWindow.GetWindow<SceneView>();
+            sceneView.onValidateCameraMode += RejectDrawMode;
+        }
+
+        static public void ResetDrawMode()
+        {
+            SceneView sceneView = EditorWindow.GetWindow<SceneView>();
+            sceneView.onValidateCameraMode -= RejectDrawMode;
+        }
+    }
+#endif
 
     public class HDRenderPipeline : RenderPipeline
     {
                 rendererSupportsReceiveShadows = true,
                 rendererSupportsReflectionProbes = true
             };
+
+#if UNITY_EDITOR
+            SceneViewDrawMode.SetupDrawMode();
+#endif
         }
 
         void InitializeDebugMaterials()
             m_VolumetricLightingModule.Cleanup();
 
             SupportedRenderingFeatures.active = new SupportedRenderingFeatures();
+
+#if UNITY_EDITOR
+            SceneViewDrawMode.ResetDrawMode();
+#endif
         }
 
         void CreateDepthStencilBuffer(HDCamera hdCamera)
 
                     m_LightLoop.UpdateCullingParameters(ref cullingParams);
 
-#if UNITY_EDITOR
-#endif
+
                     // decal system needs to be updated with current camera
                     if (m_FrameSettings.enableDBuffer)
                         DecalSystem.instance.BeginCull(camera);
                     // Make sure to unbind every render texture here because in the next iteration of the loop we might have to reallocate render texture (if the camera size is different)
                     cmd.SetRenderTarget(new RenderTargetIdentifier(-1), new RenderTargetIdentifier(-1));
 
-#if UNITY_EDITOR
-
+                    {
-#endif
+                    }
                 }
 
                 // Caution: ExecuteCommandBuffer must be outside of the profiling bracket