insert early out in shadow code for finite lights

insert early out in shadow code for finite lights

Assets/ScriptableRenderLoop/fptl/FptlLighting.cs

 				shadowLightIndex++;
 
 				bool bHasCookie = cl.light.cookie != null;
+                bool bHasShadow = cl.light.shadows != LightShadows.None;
 
 				if (cl.lightType == LightType.Spot)
 				{
 					lightData[i].flags |= (bIsCircularSpot ? LightDefinitions.IS_CIRCULAR_SPOT_SHAPE : 0);
 
 					lightData[i].flags |= (bHasCookie ? LightDefinitions.HAS_COOKIE_TEXTURE : 0);
+                    lightData[i].flags |= (bHasShadow ? LightDefinitions.HAS_SHADOW : 0);
 				}
 				else if (cl.lightType == LightType.Point)
 				{
 					lightData[i].fSphRadiusSq = range * range;
 
 					lightData[i].flags |= (bHasCookie ? LightDefinitions.HAS_COOKIE_TEXTURE : 0);
+                    lightData[i].flags |= (bHasShadow ? LightDefinitions.HAS_SHADOW : 0);
 				}
 				else
 				{

Assets/ScriptableRenderLoop/fptl/Internal-DeferredShading.shader

 				angularAtt = UNITY_SAMPLE_TEX2DARRAY_LOD(_spotCookieTextures, float3(cookCoord, lgtDat.iSliceIndex), 0.0).w;
 			}
 			atten *= angularAtt*(fProjVec>0.0);                           // finally apply this to the dist att.
-					
-			float shadowScalar = SampleShadow(SPOT_LIGHT, vPositionWs, 0, lgtDat.uShadowLightIndex);
-			atten *= shadowScalar;
+			
+			const bool bHasShadow = (lgtDat.flags&HAS_SHADOW)!=0;
+			[branch]if(bHasShadow)
+			{
+				float shadowScalar = SampleShadow(SPOT_LIGHT, vPositionWs, 0, lgtDat.uShadowLightIndex);
+				atten *= shadowScalar;
+			}
 
 			UnityLight light;
 			light.color.xyz = lgtDat.vCol.xyz*atten;
 				atten *= UNITY_SAMPLE_TEXCUBEARRAY_LOD(_pointCookieTextures, float4(-vLw, lgtDat.iSliceIndex), 0.0).w;
 			}
 			
-			float shadowScalar = SampleShadow(SPHERE_LIGHT, vPositionWs, vLw, lgtDat.uShadowLightIndex);
-			atten *= shadowScalar;
+			const bool bHasShadow = (lgtDat.flags&HAS_SHADOW)!=0;
+			[branch]if(bHasShadow)
+			{
+				float shadowScalar = SampleShadow(SPHERE_LIGHT, vPositionWs, vLw, lgtDat.uShadowLightIndex);
+				atten *= shadowScalar;
+			}
 
 			UnityLight light;
 			light.color.xyz = lgtDat.vCol.xyz*atten;

Assets/ScriptableRenderLoop/fptl/LightDefinitions.cs

     public static int IS_CIRCULAR_SPOT_SHAPE = 1;
     public static int HAS_COOKIE_TEXTURE = 2;
     public static int IS_BOX_PROJECTED = 4;
+    public static int HAS_SHADOW = 8;
 
 
     // types