Reduce EnvRef:set_node() time tenfold by postponing the dayNightDiff update until it is actually needed

src/map.cpp

@@ -923,7 +923,7 @@ void Map::updateLighting(core::map<v3s16, MapBlock*> & a_blocks,
 			i.atEnd() == false; i++)
 	{
 		MapBlock *block = i.getNode()->getValue();
-		block->updateDayNightDiff();
+		block->expireDayNightDiff();
 	}
 }
 
@@ -1084,7 +1084,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
 			i.atEnd() == false; i++)
 	{
 		MapBlock *block = i.getNode()->getValue();
-		block->updateDayNightDiff();
+		block->expireDayNightDiff();
 	}
 
 	/*
@@ -1260,7 +1260,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
 			i.atEnd() == false; i++)
 	{
 		MapBlock *block = i.getNode()->getValue();
-		block->updateDayNightDiff();
+		block->expireDayNightDiff();
 	}
 
 	/*
@@ -1297,6 +1297,7 @@ void Map::removeNodeAndUpdate(v3s16 p,
 
 bool Map::addNodeWithEvent(v3s16 p, MapNode n)
 {
+	ScopeProfiler sp(g_profiler, "Map::addNodeWithEvent", SPT_AVG);
 	MapEditEvent event;
 	event.type = MEET_ADDNODE;
 	event.p = p;
@@ -1352,12 +1353,12 @@ bool Map::removeNodeWithEvent(v3s16 p)
 	return succeeded;
 }
 
-bool Map::dayNightDiffed(v3s16 blockpos)
+bool Map::getDayNightDiff(v3s16 blockpos)
 {
 	try{
 		v3s16 p = blockpos + v3s16(0,0,0);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
@@ -1365,21 +1366,21 @@ bool Map::dayNightDiffed(v3s16 blockpos)
 	try{
 		v3s16 p = blockpos + v3s16(-1,0,0);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
 	try{
 		v3s16 p = blockpos + v3s16(0,-1,0);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
 	try{
 		v3s16 p = blockpos + v3s16(0,0,-1);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
@@ -1387,21 +1388,21 @@ bool Map::dayNightDiffed(v3s16 blockpos)
 	try{
 		v3s16 p = blockpos + v3s16(1,0,0);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
 	try{
 		v3s16 p = blockpos + v3s16(0,1,0);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
 	try{
 		v3s16 p = blockpos + v3s16(0,0,1);
 		MapBlock *b = getBlockNoCreate(p);
-		if(b->dayNightDiffed())
+		if(b->getDayNightDiff())
 			return true;
 	}
 	catch(InvalidPositionException &e){}
@@ -2294,12 +2295,12 @@ MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
 		/*
 			Update day/night difference cache of the MapBlocks
 		*/
-		block->updateDayNightDiff();
+		block->expireDayNightDiff();
 		/*
 			Set block as modified
 		*/
 		block->raiseModified(MOD_STATE_WRITE_NEEDED,
-				"finishBlockMake updateDayNightDiff");
+				"finishBlockMake expireDayNightDiff");
 	}
 
 	/*

src/map.h

@@ -226,7 +226,7 @@ public:
 	/*
 		Takes the blocks at the edges into account
 	*/
-	bool dayNightDiffed(v3s16 blockpos);
+	bool getDayNightDiff(v3s16 blockpos);
 
 	//core::aabbox3d<s16> getDisplayedBlockArea();
 

src/mapblock.cpp

@@ -49,6 +49,7 @@ MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
 		is_underground(false),
 		m_lighting_expired(true),
 		m_day_night_differs(false),
+		m_day_night_differs_expired(true),
 		m_generated(false),
 		m_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
 		m_disk_timestamp(BLOCK_TIMESTAMP_UNDEFINED),
@@ -355,9 +356,11 @@ void MapBlock::copyFrom(VoxelManipulator &dst)
 			getPosRelative(), data_size);
 }
 
-void MapBlock::updateDayNightDiff()
+void MapBlock::actuallyUpdateDayNightDiff()
 {
 	INodeDefManager *nodemgr = m_gamedef->ndef();
+	// Running this function un-expires m_day_night_differs
+	m_day_night_differs_expired = false;
 
 	if(data == NULL)
 	{
@@ -404,6 +407,19 @@ void MapBlock::updateDayNightDiff()
 	m_day_night_differs = differs;
 }
 
+void MapBlock::expireDayNightDiff()
+{
+	INodeDefManager *nodemgr = m_gamedef->ndef();
+
+	if(data == NULL){
+		m_day_night_differs = false;
+		m_day_night_differs_expired = false;
+		return;
+	}
+
+	m_day_night_differs_expired = true;
+}
+
 s16 MapBlock::getGroundLevel(v2s16 p2d)
 {
 	if(isDummy())
@@ -545,7 +561,7 @@ void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
 	u8 flags = 0;
 	if(is_underground)
 		flags |= 0x01;
-	if(m_day_night_differs)
+	if(getDayNightDiff())
 		flags |= 0x02;
 	if(m_lighting_expired)
 		flags |= 0x04;
@@ -614,6 +630,8 @@ void MapBlock::deSerialize(std::istream &is, u8 version, bool disk)
 	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapBlock format not supported");
 
+	m_day_night_differs_expired = false;
+
 	if(version <= 21)
 	{
 		deSerialize_pre22(is, version, disk);
@@ -800,7 +818,7 @@ void MapBlock::serialize_pre22(std::ostream &os, u8 version, bool disk)
 		u8 flags = 0;
 		if(is_underground)
 			flags |= 0x01;
-		if(m_day_night_differs)
+		if(getDayNightDiff())
 			flags |= 0x02;
 		if(m_lighting_expired)
 			flags |= 0x04;

src/mapblock.h

@@ -360,10 +360,17 @@ public:
 		Sets m_day_night_differs to appropriate value.
 		These methods don't care about neighboring blocks.
 	*/
-	void updateDayNightDiff();
+	void actuallyUpdateDayNightDiff();
+	/*
+		Call this to schedule what the previous function does to be done
+		when the value is actually needed.
+	*/
+	void expireDayNightDiff();
 
-	bool dayNightDiffed()
+	bool getDayNightDiff()
 	{
+		if(m_day_night_differs_expired)
+			actuallyUpdateDayNightDiff();
 		return m_day_night_differs;
 	}
 
@@ -517,6 +524,7 @@ private:
 	
 	// Whether day and night lighting differs
 	bool m_day_night_differs;
+	bool m_day_night_differs_expired;
 
 	bool m_generated;
 	

src/server.cpp

@@ -659,7 +659,7 @@ void RemoteClient::GetNextBlocks(Server *server, float dtime,
 				*/
 				if(d >= 4)
 				{
-					if(block->dayNightDiffed() == false)
+					if(block->getDayNightDiff() == false)
 						continue;
 				}
 #endif