(wip) added debug for screen space tracing

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/ScreenSpaceRaymarching.hlsl

 
     bool hitSuccessful = true;
 
+#ifdef DEBUG_DISPLAY
+    int maxUsedLevel = currentLevel;
+#endif
+
     while (currentLevel >= minLevel)
     {
         if (++iteration < MAX_ITERATIONS)
         if (hiZLinearDepth > testHitPositionTXS.z)
         {
             currentLevel = min(maxLevel, currentLevel + 1);
+#ifdef DEBUG_DISPLAY
+            maxUsedLevel = max(maxUsedLevel, currentLevel);
+#endif
             positionTXS = testHitPositionTXS;
             hit.distance += rayOffsetTestLength;
         }
             positionTXS += dirNDC * rayOffsetLength;
             hit.distance += rayOffsetLength;
+            --currentLevel;
         }
     }
 
     {
         switch (_DebugLightingSubMode)
         {
-            case DEBUGSCREENSPACETRACING_POSITION_VS:
+            case DEBUGSCREENSPACETRACING_POSITION_NDC:
+            case DEBUGSCREENSPACETRACING_DIR_NDC:
+                hit.debugOutput = dirNDC;
+                break;
+                break;
+            case DEBUGSCREENSPACETRACING_HIT_SUCCESS:
+                hit.debugOutput = hitSuccessful;
+                break;
+            case DEBUGSCREENSPACETRACING_ITERATION_COUNT:
+                hit.debugOutput = float(iteration) / float(MAX_ITERATIONS);
+                break;
+            case DEBUGSCREENSPACETRACING_MAX_USED_LEVEL:
+                hit.debugOutput = float(maxUsedLevel) / float(maxLevel);
                 break;
         }
     }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Debug/LightingDebug.cs

     public enum DebugScreenSpaceTracing
     {
         None,
-        PositionVS,
+        PositionNDC,
+        DirNDC,
-        HitDepth
+        HitDepth,
+        HitSuccess,
+        IterationCount,
+        MaxUsedLevel
     }
 
     public enum ShadowMapDebugMode

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Debug/LightingDebug.cs.hlsl

 // UnityEngine.Experimental.Rendering.HDPipeline.DebugScreenSpaceTracing:  static fields
 //
 #define DEBUGSCREENSPACETRACING_NONE (0)
-#define DEBUGSCREENSPACETRACING_POSITION_VS (1)
-#define DEBUGSCREENSPACETRACING_HIT_DISTANCE (2)
-#define DEBUGSCREENSPACETRACING_HIT_DEPTH (3)
+#define DEBUGSCREENSPACETRACING_POSITION_NDC (1)
+#define DEBUGSCREENSPACETRACING_DIR_NDC (2)
+#define DEBUGSCREENSPACETRACING_HIT_DISTANCE (3)
+#define DEBUGSCREENSPACETRACING_HIT_DEPTH (4)
+#define DEBUGSCREENSPACETRACING_HIT_SUCCESS (5)
+#define DEBUGSCREENSPACETRACING_ITERATION_COUNT (6)
+#define DEBUGSCREENSPACETRACING_MAX_USED_LEVEL (7)
 
 
 #endif