From: Loic Blot <loic.blot@unix-experience.fr>
Date: Wed, 26 Jul 2017 21:50:53 +0000 (+0200)
Subject: MapBlock::actuallyUpdateDayNightDiff(): little performance optimization
X-Git-Tag: 5.0.0~994
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=4eb59aeeb2f2b535f4eb2a1608189bb03098454e;p=oweals%2Fminetest.git

MapBlock::actuallyUpdateDayNightDiff(): little performance optimization

don't check isLightDayNightEq if checked on previous node
---

diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index f52a5ee3f..d94955a3b 100644
--- 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;
 	}
 
 	/*