HDRenderPipeline: Remove AO settings from lightloop

Assets/ScriptableRenderPipeline/HDRenderPipeline/HDRenderPipeline.cs

             if (debugDisplaySettings.renderingDebugSettings.enableSSS)
             {
                 // Output split lighting for materials tagged with the SSS stencil bit.
-                m_LightLoop.RenderDeferredLighting(hdCamera, renderContext, debugDisplaySettings, m_Asset.ssaoSettingsToUse, colorRTs, m_CameraDepthStencilBufferRT, new RenderTargetIdentifier(GetDepthTexture()), true);
+                m_LightLoop.RenderDeferredLighting(hdCamera, renderContext, debugDisplaySettings, colorRTs, m_CameraDepthStencilBufferRT, new RenderTargetIdentifier(GetDepthTexture()), true);
-            m_LightLoop.RenderDeferredLighting(hdCamera, renderContext, debugDisplaySettings, m_Asset.ssaoSettingsToUse, colorRTs, m_CameraDepthStencilBufferRT, new RenderTargetIdentifier(GetDepthTexture()), false);
+            m_LightLoop.RenderDeferredLighting(hdCamera, renderContext, debugDisplaySettings, colorRTs, m_CameraDepthStencilBufferRT, new RenderTargetIdentifier(GetDepthTexture()), false);
         }
 
         // Combines specular lighting and diffuse lighting with subsurface scattering.

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/AmbientOcclusion/AmbientOcclusion.cs

             const FilterMode kFilter = FilterMode.Bilinear;
 
             // Note: Currently there is no SSAO in forward as we don't have normal buffer
+            // If SSAO is disable, simply put a white 1x1 texture
-                var cmd2 = new CommandBuffer { name = "Ambient Occlusion (1x1)" };
-                // TODO: Create a white 1x1 texture to setup here when AO is disabled (we could also do a variant in shader, but this increase number of combination)
-                cmd2.GetTemporaryRT(Uniforms._AOBuffer, 1, 1, 0, kFilter, kFormat, kRWMode);
-                cmd2.SetRenderTarget(Uniforms._AOBuffer);
-                cmd2.ClearRenderTarget(false, true, Color.white);
-                // Setup texture for lighting pass (automatic of unity)
-                cmd2.SetGlobalTexture("_AmbientOcclusionTexture", Uniforms._AOBuffer);
-
-                // Register the command buffer and release it.
+                var cmd2 = new CommandBuffer { name = "Setup neutral Ambient Occlusion (1x1)" };
+                cmd2.SetGlobalTexture("_AmbientOcclusionTexture", PostProcessing.RuntimeUtilities.whiteTexture);
                 renderContext.ExecuteCommandBuffer(cmd2);
                 cmd2.Dispose();
 
 
         public void Cleanup()
         {
-            if (m_Material != null)
-            {
-                if (Application.isPlaying)
-                    Object.Destroy(m_Material);
-                else
-                    Object.DestroyImmediate(m_Material);
-            }
+            Utilities.Destroy(m_Material);
         }
     }
 }

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.cs

 
             public void RenderDeferredLighting( HDCamera hdCamera, ScriptableRenderContext renderContext,
                                                 DebugDisplaySettings debugDisplaySettings,
-                                                ScreenSpaceAmbientOcclusionSettings.Settings ambientOcclusionSettings,
                                                 RenderTargetIdentifier[] colorBuffers, RenderTargetIdentifier depthStencilBuffer, RenderTargetIdentifier depthStencilTexture,
                                                 bool outputSplitLightingForSSS)
             {

Assets/DebugMenuState.asset

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