finally got around to replacing this with a suitable intrinsic

finally got around to replacing this with a suitable intrinsic

Assets/ScriptableRenderLoop/fptl/lightlistbuild-bigtile.compute

 
 
 
-// NOTE! returns 1 when value_in==0
+#if 0
-	return value;
+	return value_in==0 ? 0 : value;
+#else
+	uint valpw2 = value_in==0 ? 0 : (1<<firstbithigh(value_in));		// firstbithigh(0) returns -1
+	return max(valpw2, valpw2<<(valpw2!=value_in ? 1 : 0));	// max() just in case of overflow
+#endif
 }
 
 

Assets/ScriptableRenderLoop/fptl/lightlistbuild-clustered.compute

 }
 
 
-// NOTE! returns 1 when value_in==0
+#if 0
-	return value;
+	return value_in==0 ? 0 : value;
+#else
+	uint valpw2 = value_in==0 ? 0 : (1<<firstbithigh(value_in));		// firstbithigh(0) returns -1
+	return max(valpw2, valpw2<<(valpw2!=value_in ? 1 : 0));	// max() just in case of overflow
+#endif
 }
 
 

Assets/ScriptableRenderLoop/fptl/lightlistbuild.compute

  
 #else
 
-// NOTE! returns 1 when value_in==0
+#if 0
-	return value;
+	return value_in==0 ? 0 : value;
+#else
+	uint valpw2 = value_in==0 ? 0 : (1<<firstbithigh(value_in));		// firstbithigh(0) returns -1
+	return max(valpw2, valpw2<<(valpw2!=value_in ? 1 : 0));	// max() just in case of overflow
+#endif
 }