MapBlock::actuallyUpdateDayNightDiff(): little performance optimization

don't check isLightDayNightEq if checked on previous node
minetest · Jul 27, 2017 · 4eb59ae · 4eb59ae
1 parent c27504a
commit 4eb59ae
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/src/mapblock.cpp b/src/mapblock.cpp
@@ -366,12 +366,19 @@ void MapBlock::actuallyUpdateDayNightDiff()
 	/*
 		Check if any lighting value differs
 	*/
+
+	MapNode previous_n;
 	for (u32 i = 0; i < nodecount; i++) {
-		MapNode &n = data[i];
+		MapNode n = data[i];
+
+		// If node is identical to previous node, don't verify if it differs
+		if (n == previous_n)
+			continue;
 
 		differs = !n.isLightDayNightEq(nodemgr);
 		if (differs)
 			break;
+		previous_n = n;
 	}
 
 	/*