Added debug for HiZ SSRT

ScriptableRenderPipeline/Core/CoreRP/Debugging/MousePositionDebug.cs

                     {
                         case KeyCode.PageUp:
                             ++m_DebugStep;
+                            sceneview.Repaint();
+                            sceneview.Repaint();
+                            sceneview.Repaint();
                             break;
                     }
                     break;

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Debug/DebugFullScreen.shader

                 {
                     const float circleRadius = 3.5;
                     const float ringSize = 1.5;
-                    const float4 color = SAMPLE_TEXTURE2D(_DebugFullScreenTexture, s_point_clamp_sampler, input.texcoord);
+                    float4 color = SAMPLE_TEXTURE2D(_DebugFullScreenTexture, s_point_clamp_sampler, input.texcoord);
 
                     ScreenSpaceTracingDebug debug = _DebugScreenSpaceTracingData[0];
 
                     const float w = clamp(1 - startPositionRingSDF - positionRingSDF, 0, 1);
                     col.rgb = col.rgb * w + float3(1, 1, 1) * (1 - w);
 
+                    if (_ShowDepthPyramidDebug == 1)
+                        color.rgb = frac(float3(debugLinearDepth, debugLinearDepth, debugLinearDepth) * 0.1);
+
-                    if (_ShowDepthPyramidDebug == 1) 
-                        col.rgb = float3(col.rgb * 0.5 + frac(float3(debugLinearDepth, debugLinearDepth, debugLinearDepth) * 0.1));
 
                     return col;
                 }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

                 cmd.SetGlobalVector(HDShaderIDs._MouseClickPixelCoord, HDUtils.GetMouseClickCoordinates(hdCamera));
                 cmd.SetGlobalTexture(HDShaderIDs._DebugFont, m_Asset.renderPipelineResources.debugFontTexture);
                 cmd.SetGlobalInt(HDShaderIDs._DebugStep, HDUtils.debugStep);
+                cmd.SetGlobalInt(HDShaderIDs._ShowGrid, m_CurrentDebugDisplaySettings.showSSRayGrid ? 1 : 0);
+                cmd.SetGlobalInt(HDShaderIDs._ShowDepthPyramidDebug, m_CurrentDebugDisplaySettings.showSSRayDepthPyramid ? 1 : 0);
 
                 // The DebugNeedsExposure test allows us to set a neutral value if exposure is not needed. This way we don't need to make various tests inside shaders but only in this function.
                 cmd.SetGlobalFloat(HDShaderIDs._DebugExposure, m_CurrentDebugDisplaySettings.DebugNeedsExposure() ? lightingDebugSettings.debugExposure : 0.0f);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDStringConstants.cs

         public static readonly int _DebugFont = Shader.PropertyToID("_DebugFont");
         public static readonly int _DebugExposure = Shader.PropertyToID("_DebugExposure");
         public static readonly int _DebugScreenSpaceTracingData = Shader.PropertyToID("_DebugScreenSpaceTracingData");
+        public static readonly int _ShowGrid = Shader.PropertyToID("_ShowGrid");
+        public static readonly int _ShowDepthPyramidDebug = Shader.PropertyToID("_ShowDepthPyramidDebug");
 
         public static readonly int _DebugEnvironmentProxyDepthScale = Shader.PropertyToID("_DebugEnvironmentProxyDepthScale");
         public static readonly int _DebugViewMaterial = Shader.PropertyToID("_DebugViewMaterial");

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.hlsl

 // Depth pyramid (width, height, lodcount, Unused)
 TEXTURE2D(_DepthPyramidTexture);
 
-CBUFFER_START(UnityGaussianPyramidParameters)
+CBUFFER_START(UnityLightingParameters)
+// Buffer pyramid
-CBUFFER_END
-CBUFFER_START(UnityScreenSpaceLightingParameters)
+// Screen space lighting
+
+// Ambiant occlusion
+float4 _AmbientOcclusionParam; // xyz occlusion color, w directLightStrenght
-
-CBUFFER_START(UnityAmbientOcclusionParameters)
-float4 _AmbientOcclusionParam; // xyz occlusion color, w directLightStrenght
-CBUFFER_END
 
 // Area light textures
 // TODO: This one should be set into a constant Buffer at pass frequency (with _Screensize)