Merge pull request #1060 from Unity-Technologies/shadows-globaloverride

Added reading the global overrides when launching shadow requests.

ScriptableRenderPipeline/Core/CoreRP/Shadow/Shadow.cs

 
                     int sa, sv, sp;
                     asd.GetShadowAlgorithm( out sa, out sv, out sp );
-                    sreq.shadowAlgorithm = ShadowUtils.Pack( (ShadowAlgorithm) sa, (ShadowVariant) sv, (ShadowPrecision) sp );
+                    GPUShadowAlgorithm packed_algo = ShadowUtils.Pack( (ShadowAlgorithm) sa, (ShadowVariant) sv, (ShadowPrecision) sp );
+                    GetGlobalShadowOverride( shadowType, ref packed_algo );
+                    sreq.shadowAlgorithm = packed_algo;
                     totalRequestCount += (uint) facecount;
                     requestsGranted.AddUnchecked( sreq );
                     totalSlots--;

ScriptableRenderPipeline/Core/CoreRP/Shadow/ShadowBase.cs

         {
             m_GlobalOverrides[(int)shadowType].enabled = enabled;
         }
+
+        public bool GetGlobalShadowOverride( GPUShadowType shadowType, ref GPUShadowAlgorithm algo )
+        {
+            if( m_GlobalOverrides[(int)shadowType].enabled )
+                algo = ShadowUtils.Pack( m_GlobalOverrides[(int)shadowType].algorithm, m_GlobalOverrides[(int)shadowType].variant, m_GlobalOverrides[(int)shadowType].precision );
+            
+            return m_GlobalOverrides[(int)shadowType].enabled;
+        }
     }
 
     // This is the struct passed into shaders