Implement tile & cluster support for orthographic projector lights

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

                     Vector3 xAxisVS = worldToView.MultiplyVector(lightData.right);
                     Vector3 yAxisVS = worldToView.MultiplyVector(lightData.up);
                     Vector3 zAxisVS = worldToView.MultiplyVector(lightData.forward);
-                    float   radius  = 1.0f / Mathf.Sqrt(lightData.invSqrAttenuationRadius);
-                    Vector3 boxDims     = new Vector3(lightData.size.x, lightData.size.y, radius);
-                    Vector3 boxCenterVS = posVS + zAxisVS * (0.5f * radius);
+                    Vector3 boxDims     = new Vector3(lightData.size.x, lightData.size.y, 1000000.0f);
-                    bound.center   = boxCenterVS;
-                    bound.boxAxisX = 0.5f * boxDims.x * xAxisVS;                                    // Should this be halved or not?
-                    bound.boxAxisY = 0.5f * boxDims.y * yAxisVS;
-                    bound.boxAxisZ = 0.5f * boxDims.z * zAxisVS;
-                    bound.radius   = 0.5f * boxDims.magnitude;                                      // Radius of a circumscribed sphere?
+                    bound.center   = posVS;
+                    bound.boxAxisX = boxDims.x * xAxisVS;                                                   // Should this be halved or not?
+                    bound.boxAxisY = boxDims.y * yAxisVS;                                                   // Should this be halved or not?
+                    bound.boxAxisZ = boxDims.z * zAxisVS;                                                   // Should this be halved or not?
+                    bound.radius   = 0.5f * boxDims.magnitude;                                              // Radius of a circumscribed sphere?
-                    lightVolumeData.lightPos   = boxCenterVS;                                       // Is it the center of the volume?
+                    lightVolumeData.lightPos   = posVS;                                                     // Is this the center of the volume?
-                    lightVolumeData.boxInnerDist = boxDims * 0.5f;                                  // No idea what this is. Document your code
-                    lightVolumeData.boxInvRange.Set(1.0f / radius, 1.0f / radius, 1.0f / radius);   // No idea what this is. Document your code
+                    lightVolumeData.boxInnerDist = boxDims * 0.5f;                                          // No idea what this is. Document your code
+                    lightVolumeData.boxInvRange.Set(1.0f / boxDims.x, 1.0f / boxDims.y, 1.0f / boxDims.z);  // No idea what this is. Document your code
                     lightVolumeData.featureFlags = LightFeatureFlags.FEATURE_FLAG_LIGHT_PROJECTOR;
                 }
                 else

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePass.hlsl

 #define PROCESS_DIRECTIONAL_LIGHT
 #define PROCESS_PUNCTUAL_LIGHT
 #define PROCESS_AREA_LIGHT
+#define PROCESS_PROJECTOR_LIGHT
 #endif
 
 #if defined (LIGHTLOOP_TILE_INDIRECT) || defined(LIGHTLOOP_TILE_ALL)

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePassLoop.hlsl

     }
 #endif
 
+#ifdef PROCESS_PROJECTOR_LIGHT
+    if(featureFlags & FEATURE_FLAG_LIGHT_PROJECTOR)
+    {
+        // TODO: Convert the for loop below to a while on each type as we know we are sorted!
+        uint projectorLightStart;
+        uint projectorLightCount;
+        GetCountAndStart(posInput, LIGHTCATEGORY_PROJECTOR, projectorLightStart, projectorLightCount);
+        for(i = 0; i < projectorLightCount; ++i)
+        {
+            float3 localDiffuseLighting, localSpecularLighting;
+
+            uint projectorIndex = FetchIndex(projectorLightStart, i);
+
+            EvaluateBSDF_Projector(context, V, posInput, prelightData, _LightDatas[projectorIndex], bsdfData,
+                                   localDiffuseLighting, localSpecularLighting);
+
+            diffuseLighting += localDiffuseLighting;
+            specularLighting += localSpecularLighting;
+        }
+    }
+#endif
+
 #ifdef PROCESS_ENV_LIGHT
     float3 iblDiffuseLighting = float3(0.0, 0.0, 0.0);
     float3 iblSpecularLighting = float3(0.0, 0.0, 0.0);