Lighting: Update lighting at block loading

This commit updates mapblocks' light if necessary when they are loaded.
This removes ghost lighting.

7 files changed, 273 insertions, 121 deletions

diff --git a/src/clientiface.cpp b/src/clientiface.cpp
index 47730343c..0eb68c9c1 100644
--- a/src/clientiface.cpp
+++ b/src/clientiface.cpp
@@ -283,12 +283,6 @@ void RemoteClient::GetNextBlocks (
 					surely_not_found_on_disk = true;
 				}
 
-				// Block is valid if lighting is up-to-date and data exists
-				if(block->isValid() == false)
-				{
-					block_is_invalid = true;
-				}
-
 				if(block->isGenerated() == false)
 					block_is_invalid = true;
 
diff --git a/src/map.cpp b/src/map.cpp
index f2a4b7ffe..ffba77262 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -824,7 +824,7 @@ void Map::addNodeAndUpdate(v3s16 p, MapNode n,
 	// Update lighting
 	std::vector<std::pair<v3s16, MapNode> > oldnodes;
 	oldnodes.push_back(std::pair<v3s16, MapNode>(p, oldnode));
-	voxalgo::update_lighting_nodes(this, m_nodedef, oldnodes, modified_blocks);
+	voxalgo::update_lighting_nodes(this, oldnodes, modified_blocks);
 
 	for(std::map<v3s16, MapBlock*>::iterator
 			i = modified_blocks.begin();
@@ -1523,7 +1523,7 @@ void Map::transformLiquids(std::map<v3s16, MapBlock*> &modified_blocks)
 	for (std::deque<v3s16>::iterator iter = must_reflow.begin(); iter != must_reflow.end(); ++iter)
 		m_transforming_liquid.push_back(*iter);
 
-	voxalgo::update_lighting_nodes(this, m_nodedef, changed_nodes, modified_blocks);
+	voxalgo::update_lighting_nodes(this, changed_nodes, modified_blocks);
 
 
 	/* ----------------------------------------------------------------------
@@ -1955,28 +1955,11 @@ void ServerMap::finishBlockMake(BlockMakeData *data,
 	v3s16 bpmax = data->blockpos_max;
 
 	v3s16 extra_borders(1, 1, 1);
-	v3s16 full_bpmin = bpmin - extra_borders;
-	v3s16 full_bpmax = bpmax + extra_borders;
 
 	bool enable_mapgen_debug_info = m_emerge->enable_mapgen_debug_info;
 	EMERGE_DBG_OUT("finishBlockMake(): " PP(bpmin) " - " PP(bpmax));
 
 	/*
-		Set lighting to non-expired state in all of them.
-		This is cheating, but it is not fast enough if all of them
-		would actually be updated.
-	*/
-	for (s16 x = full_bpmin.X; x <= full_bpmax.X; x++)
-	for (s16 z = full_bpmin.Z; z <= full_bpmax.Z; z++)
-	for (s16 y = full_bpmin.Y; y <= full_bpmax.Y; y++) {
-		MapBlock *block = emergeBlock(v3s16(x, y, z), false);
-		if (!block)
-			continue;
-
-		block->setLightingExpired(false);
-	}
-
-	/*
 		Blit generated stuff to map
 		NOTE: blitBackAll adds nearly everything to changed_blocks
 	*/
@@ -2991,7 +2974,6 @@ void ServerMap::loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool
 
 		// We just loaded it from, so it's up-to-date.
 		block->resetModified();
-
 	}
 	catch(SerializationError &e)
 	{
@@ -3015,71 +2997,80 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
 {
 	DSTACK(FUNCTION_NAME);
 
+	bool created_new = (getBlockNoCreateNoEx(blockpos) == NULL);
+
 	v2s16 p2d(blockpos.X, blockpos.Z);
 
 	std::string ret;
 	dbase->loadBlock(blockpos, &ret);
 	if (ret != "") {
 		loadBlock(&ret, blockpos, createSector(p2d), false);
-		return getBlockNoCreateNoEx(blockpos);
-	}
-	// Not found in database, try the files
-
-	// The directory layout we're going to load from.
-	//  1 - original sectors/xxxxzzzz/
-	//  2 - new sectors2/xxx/zzz/
-	//  If we load from anything but the latest structure, we will
-	//  immediately save to the new one, and remove the old.
-	int loadlayout = 1;
-	std::string sectordir1 = getSectorDir(p2d, 1);
-	std::string sectordir;
-	if(fs::PathExists(sectordir1))
-	{
-		sectordir = sectordir1;
-	}
-	else
-	{
-		loadlayout = 2;
-		sectordir = getSectorDir(p2d, 2);
-	}
+	} else {
+		// Not found in database, try the files
+
+		// The directory layout we're going to load from.
+		//  1 - original sectors/xxxxzzzz/
+		//  2 - new sectors2/xxx/zzz/
+		//  If we load from anything but the latest structure, we will
+		//  immediately save to the new one, and remove the old.
+		int loadlayout = 1;
+		std::string sectordir1 = getSectorDir(p2d, 1);
+		std::string sectordir;
+		if (fs::PathExists(sectordir1)) {
+			sectordir = sectordir1;
+		} else {
+			loadlayout = 2;
+			sectordir = getSectorDir(p2d, 2);
+		}
 
-	/*
+		/*
 		Make sure sector is loaded
-	*/
+		 */
 
-	MapSector *sector = getSectorNoGenerateNoEx(p2d);
-	if(sector == NULL)
-	{
-		try{
-			sector = loadSectorMeta(sectordir, loadlayout != 2);
-		}
-		catch(InvalidFilenameException &e)
-		{
-			return NULL;
-		}
-		catch(FileNotGoodException &e)
-		{
-			return NULL;
-		}
-		catch(std::exception &e)
-		{
-			return NULL;
+		MapSector *sector = getSectorNoGenerateNoEx(p2d);
+		if (sector == NULL) {
+			try {
+				sector = loadSectorMeta(sectordir, loadlayout != 2);
+			} catch(InvalidFilenameException &e) {
+				return NULL;
+			} catch(FileNotGoodException &e) {
+				return NULL;
+			} catch(std::exception &e) {
+				return NULL;
+			}
 		}
-	}
 
-	/*
+
+		/*
 		Make sure file exists
-	*/
+		 */
 
-	std::string blockfilename = getBlockFilename(blockpos);
-	if(fs::PathExists(sectordir + DIR_DELIM + blockfilename) == false)
-		return NULL;
+		std::string blockfilename = getBlockFilename(blockpos);
+		if (fs::PathExists(sectordir + DIR_DELIM + blockfilename) == false)
+			return NULL;
 
-	/*
+		/*
 		Load block and save it to the database
-	*/
-	loadBlock(sectordir, blockfilename, sector, true);
-	return getBlockNoCreateNoEx(blockpos);
+		 */
+		loadBlock(sectordir, blockfilename, sector, true);
+	}
+	MapBlock *block = getBlockNoCreateNoEx(blockpos);
+	if (created_new && (block != NULL)) {
+		std::map<v3s16, MapBlock*> modified_blocks;
+		// Fix lighting if necessary
+		voxalgo::update_block_border_lighting(this, block, modified_blocks);
+		if (!modified_blocks.empty()) {
+			//Modified lighting, send event
+			MapEditEvent event;
+			event.type = MEET_OTHER;
+			std::map<v3s16, MapBlock *>::iterator it;
+			for (it = modified_blocks.begin();
+					it != modified_blocks.end(); ++it)
+				event.modified_blocks.insert(it->first);
+			dispatchEvent(&event);
+		}
+	}
+	return block;
 }
 
 bool ServerMap::deleteBlock(v3s16 blockpos)
diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index f8c3197bc..840cb9b39 100644
--- a/src/mapblock.cpp
+++ b/src/mapblock.cpp
@@ -73,7 +73,7 @@ MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
 		m_modified(MOD_STATE_WRITE_NEEDED),
 		m_modified_reason(MOD_REASON_INITIAL),
 		is_underground(false),
-		m_lighting_expired(true),
+		m_lighting_complete(0xFFFF),
 		m_day_night_differs(false),
 		m_day_night_differs_expired(true),
 		m_generated(false),
@@ -571,11 +571,12 @@ void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
 		flags |= 0x01;
 	if(getDayNightDiff())
 		flags |= 0x02;
-	if(m_lighting_expired)
-		flags |= 0x04;
 	if(m_generated == false)
 		flags |= 0x08;
 	writeU8(os, flags);
+	if (version >= 27) {
+		writeU16(os, m_lighting_complete);
+	}
 
 	/*
 		Bulk node data
@@ -672,7 +673,11 @@ void MapBlock::deSerialize(std::istream &is, u8 version, bool disk)
 	u8 flags = readU8(is);
 	is_underground = (flags & 0x01) ? true : false;
 	m_day_night_differs = (flags & 0x02) ? true : false;
-	m_lighting_expired = (flags & 0x04) ? true : false;
+	if (version < 27) {
+		m_lighting_complete = 0xFFFF;
+	} else {
+		m_lighting_complete = readU16(is);
+	}
 	m_generated = (flags & 0x08) ? false : true;
 
 	/*
@@ -783,7 +788,7 @@ void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
 	// Initialize default flags
 	is_underground = false;
 	m_day_night_differs = false;
-	m_lighting_expired = false;
+	m_lighting_complete = 0xFFFF;
 	m_generated = true;
 
 	// Make a temporary buffer
@@ -849,7 +854,6 @@ void MapBlock::deSerialize_pre22(std::istream &is, u8 version, bool disk)
 		is.read((char*)&flags, 1);
 		is_underground = (flags & 0x01) ? true : false;
 		m_day_night_differs = (flags & 0x02) ? true : false;
-		m_lighting_expired = (flags & 0x04) ? true : false;
 		if(version >= 18)
 			m_generated = (flags & 0x08) ? false : true;
 
@@ -1027,10 +1031,7 @@ std::string analyze_block(MapBlock *block)
 	else
 		desc<<"is_ug [ ], ";
 
-	if(block->getLightingExpired())
-		desc<<"lighting_exp [X], ";
-	else
-		desc<<"lighting_exp [ ], ";
+	desc<<"lighting_complete: "<<block->getLightingComplete()<<", ";
 
 	if(block->isDummy())
 	{
diff --git a/src/mapblock.h b/src/mapblock.h
index f80800109..5a0ec937a 100644
--- a/src/mapblock.h
+++ b/src/mapblock.h
@@ -105,7 +105,7 @@ public:
 #define MOD_REASON_INITIAL                   (1 << 0)
 #define MOD_REASON_REALLOCATE                (1 << 1)
 #define MOD_REASON_SET_IS_UNDERGROUND        (1 << 2)
-#define MOD_REASON_SET_LIGHTING_EXPIRED      (1 << 3)
+#define MOD_REASON_SET_LIGHTING_COMPLETE     (1 << 3)
 #define MOD_REASON_SET_GENERATED             (1 << 4)
 #define MOD_REASON_SET_NODE                  (1 << 5)
 #define MOD_REASON_SET_NODE_NO_CHECK         (1 << 6)
@@ -213,17 +213,42 @@ public:
 		raiseModified(MOD_STATE_WRITE_NEEDED, MOD_REASON_SET_IS_UNDERGROUND);
 	}
 
-	inline void setLightingExpired(bool expired)
+	inline void setLightingComplete(u16 newflags)
 	{
-		if (expired != m_lighting_expired){
-			m_lighting_expired = expired;
-			raiseModified(MOD_STATE_WRITE_NEEDED, MOD_REASON_SET_LIGHTING_EXPIRED);
+		if (newflags != m_lighting_complete) {
+			m_lighting_complete = newflags;
+			raiseModified(MOD_STATE_WRITE_NEEDED, MOD_REASON_SET_LIGHTING_COMPLETE);
 		}
 	}
 
-	inline bool getLightingExpired()
+	inline u16 getLightingComplete()
 	{
-		return m_lighting_expired;
+		return m_lighting_complete;
+	}
+
+	inline void setLightingComplete(LightBank bank, u8 direction,
+		bool is_complete)
+	{
+		assert(direction >= 0 && direction <= 5);
+		if (bank == LIGHTBANK_NIGHT) {
+			direction += 6;
+		}
+		u16 newflags = m_lighting_complete;
+		if (is_complete) {
+			newflags |= 1 << direction;
+		} else {
+			newflags &= ~(1 << direction);
+		}
+		setLightingComplete(newflags);
+	}
+
+	inline bool isLightingComplete(LightBank bank, u8 direction)
+	{
+		assert(direction >= 0 && direction <= 5);
+		if (bank == LIGHTBANK_NIGHT) {
+			direction += 6;
+		}
+		return (m_lighting_complete & (1 << direction)) != 0;
 	}
 
 	inline bool isGenerated()
@@ -239,15 +264,6 @@ public:
 		}
 	}
 
-	inline bool isValid()
-	{
-		if (m_lighting_expired)
-			return false;
-		if (data == NULL)
-			return false;
-		return true;
-	}
-
 	////
 	//// Position stuff
 	////
@@ -613,14 +629,14 @@ private:
 	*/
 	bool is_underground;
 
-	/*
-		Set to true if changes has been made that make the old lighting
-		values wrong but the lighting hasn't been actually updated.
-
-		If this is false, lighting is exactly right.
-		If this is true, lighting might be wrong or right.
+	/*!
+	 * Each bit indicates if light spreading was finished
+	 * in a direction. (Because the neighbor could also be unloaded.)
+	 * Bits: day X+, day Y+, day Z+, day Z-, day Y-, day X-,
+	 * night X+, night Y+, night Z+, night Z-, night Y-, night X-,
+	 * nothing, nothing, nothing, nothing.
 	*/
-	bool m_lighting_expired;
+	u16 m_lighting_complete;
 
 	// Whether day and night lighting differs
 	bool m_day_night_differs;
diff --git a/src/serialization.h b/src/serialization.h
index 01d37d363..52c63098e 100644
--- a/src/serialization.h
+++ b/src/serialization.h
@@ -62,13 +62,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	24: 16-bit node ids and node timers (never released as stable)
 	25: Improved node timer format
 	26: Never written; read the same as 25
+	27: Added light spreading flags to blocks
 */
 // This represents an uninitialized or invalid format
 #define SER_FMT_VER_INVALID 255
 // Highest supported serialization version
-#define SER_FMT_VER_HIGHEST_READ 26
+#define SER_FMT_VER_HIGHEST_READ 27
 // Saved on disk version
-#define SER_FMT_VER_HIGHEST_WRITE 25
+#define SER_FMT_VER_HIGHEST_WRITE 27
 // Lowest supported serialization version
 #define SER_FMT_VER_LOWEST_READ 0
 // Lowest serialization version for writing
diff --git a/src/voxelalgorithms.cpp b/src/voxelalgorithms.cpp
index c20917164..3c32bc125 100644
--- a/src/voxelalgorithms.cpp
+++ b/src/voxelalgorithms.cpp
@@ -423,6 +423,7 @@ void unspread_light(Map *map, INodeDefManager *nodemgr, LightBank bank,
 			if (step_rel_block_pos(i, neighbor_rel_pos, neighbor_block_pos)) {
 				neighbor_block = map->getBlockNoCreateNoEx(neighbor_block_pos);
 				if (neighbor_block == NULL) {
+					current.block->setLightingComplete(bank, i, false);
 					continue;
 				}
 			} else {
@@ -486,7 +487,8 @@ void unspread_light(Map *map, INodeDefManager *nodemgr, LightBank bank,
  * \param modified_blocks output, all modified map blocks are added to this
  */
 void spread_light(Map *map, INodeDefManager *nodemgr, LightBank bank,
-	LightQueue &light_sources, std::map<v3s16, MapBlock*> &modified_blocks)
+	LightQueue &light_sources,
+	std::map<v3s16, MapBlock*> &modified_blocks)
 {
 	// The light the current node can provide to its neighbors.
 	u8 spreading_light;
@@ -511,6 +513,7 @@ void spread_light(Map *map, INodeDefManager *nodemgr, LightBank bank,
 			if (step_rel_block_pos(i, neighbor_rel_pos, neighbor_block_pos)) {
 				neighbor_block = map->getBlockNoCreateNoEx(neighbor_block_pos);
 				if (neighbor_block == NULL) {
+					current.block->setLightingComplete(bank, i, false);
 					continue;
 				}
 			} else {
@@ -584,10 +587,11 @@ bool is_sunlight_above(Map *map, v3s16 pos, INodeDefManager *ndef)
 
 static const LightBank banks[] = { LIGHTBANK_DAY, LIGHTBANK_NIGHT };
 
-void update_lighting_nodes(Map *map, INodeDefManager *ndef,
+void update_lighting_nodes(Map *map,
 	std::vector<std::pair<v3s16, MapNode> > &oldnodes,
 	std::map<v3s16, MapBlock*> &modified_blocks)
 {
+	INodeDefManager *ndef = map->getNodeDefManager();
 	// For node getter functions
 	bool is_valid_position;
 
@@ -596,6 +600,22 @@ void update_lighting_nodes(Map *map, INodeDefManager *ndef,
 		LightBank bank = banks[i];
 		UnlightQueue disappearing_lights(256);
 		ReLightQueue light_sources(256);
+		// Nodes that are brighter than the brightest modified node was
+		// won't change, since they didn't get their light from a
+		// modified node.
+		u8 min_safe_light = 0;
+		for (std::vector<std::pair<v3s16, MapNode> >::iterator it =
+				oldnodes.begin(); it < oldnodes.end(); ++it) {
+			u8 old_light = it->second.getLight(bank, ndef);
+			if (old_light > min_safe_light) {
+				min_safe_light = old_light;
+			}
+		}
+		// If only one node changed, even nodes with the same brightness
+		// didn't get their light from the changed node.
+		if (oldnodes.size() > 1) {
+			min_safe_light++;
+		}
 		// For each changed node process sunlight and initialize
 		for (std::vector<std::pair<v3s16, MapNode> >::iterator it =
 				oldnodes.begin(); it < oldnodes.end(); ++it) {
@@ -634,11 +654,9 @@ void update_lighting_nodes(Map *map, INodeDefManager *ndef,
 						MapNode n2 = map->getNodeNoEx(p2, &is_valid);
 						if (is_valid) {
 							u8 spread = n2.getLight(bank, ndef);
-							// If the neighbor is at least as bright as
-							// this node then its light is not from
-							// this node.
-							// Its light can spread to this node.
-							if (spread > new_light && spread >= old_light) {
+							// If it is sure that the neighbor won't be
+							// unlighted, its light can spread to this node.
+							if (spread > new_light && spread >= min_safe_light) {
 								new_light = spread - 1;
 							}
 						}
@@ -747,6 +765,126 @@ void update_lighting_nodes(Map *map, INodeDefManager *ndef,
 	}
 }
 
+/*!
+ * Borders of a map block in relative node coordinates.
+ * Compatible with type 'direction'.
+ */
+const VoxelArea block_borders[] = {
+	VoxelArea(v3s16(15, 0, 0), v3s16(15, 15, 15)), //X+
+	VoxelArea(v3s16(0, 15, 0), v3s16(15, 15, 15)), //Y+
+	VoxelArea(v3s16(0, 0, 15), v3s16(15, 15, 15)), //Z+
+	VoxelArea(v3s16(0, 0, 0), v3s16(15, 15, 0)),   //Z-
+	VoxelArea(v3s16(0, 0, 0), v3s16(15, 0, 15)),   //Y-
+	VoxelArea(v3s16(0, 0, 0), v3s16(0, 15, 15))    //X-
+};
+
+/*!
+ * Returns true if:
+ * -the node has unloaded neighbors
+ * -the node doesn't have light
+ * -the node's light is the same as the maximum of
+ * its light source and its brightest neighbor minus one.
+ * .
+ */
+bool is_light_locally_correct(Map *map, INodeDefManager *ndef, LightBank bank,
+	v3s16 pos)
+{
+	bool is_valid_position;
+	MapNode n = map->getNodeNoEx(pos, &is_valid_position);
+	const ContentFeatures &f = ndef->get(n);
+	if (f.param_type != CPT_LIGHT) {
+		return true;
+	}
+	u8 light = n.getLightNoChecks(bank, &f);
+	assert(f.light_source <= LIGHT_MAX);
+	u8 brightest_neighbor = f.light_source + 1;
+	for (direction d = 0; d < 6; ++d) {
+		MapNode n2 = map->getNodeNoEx(pos + neighbor_dirs[d],
+			&is_valid_position);
+		u8 light2 = n2.getLight(bank, ndef);
+		if (brightest_neighbor < light2) {
+			brightest_neighbor = light2;
+		}
+	}
+	assert(light <= LIGHT_SUN);
+	return brightest_neighbor == light + 1;
+}
+
+void update_block_border_lighting(Map *map, MapBlock *block,
+	std::map<v3s16, MapBlock*> &modified_blocks)
+{
+	INodeDefManager *ndef = map->getNodeDefManager();
+	bool is_valid_position;
+	for (s32 i = 0; i < 2; i++) {
+		LightBank bank = banks[i];
+		UnlightQueue disappearing_lights(256);
+		ReLightQueue light_sources(256);
+		// Get incorrect lights
+		for (direction d = 0; d < 6; d++) {
+			// For each direction
+			// Get neighbor block
+			v3s16 otherpos = block->getPos() + neighbor_dirs[d];
+			MapBlock *other = map->getBlockNoCreateNoEx(otherpos);
+			if (other == NULL) {
+				continue;
+			}
+			// Only update if lighting was not completed.
+			if (block->isLightingComplete(bank, d) &&
+					other->isLightingComplete(bank, 5 - d))
+				continue;
+			// Reset flags
+			block->setLightingComplete(bank, d, true);
+			other->setLightingComplete(bank, 5 - d, true);
+			// The two blocks and their connecting surfaces
+			MapBlock *blocks[] = {block, other};
+			VoxelArea areas[] = {block_borders[d], block_borders[5 - d]};
+			// For both blocks
+			for (u8 blocknum = 0; blocknum < 2; blocknum++) {
+				MapBlock *b = blocks[blocknum];
+				VoxelArea a = areas[blocknum];
+				// For all nodes
+				for (s32 x = a.MinEdge.X; x <= a.MaxEdge.X; x++)
+				for (s32 z = a.MinEdge.Z; z <= a.MaxEdge.Z; z++)
+				for (s32 y = a.MinEdge.Y; y <= a.MaxEdge.Y; y++) {
+					MapNode n = b->getNodeNoCheck(x, y, z,
+						&is_valid_position);
+					u8 light = n.getLight(bank, ndef);
+					// Sunlight is fixed
+					if (light < LIGHT_SUN) {
+						// Unlight if not correct
+						if (!is_light_locally_correct(map, ndef, bank,
+								v3s16(x, y, z) + b->getPosRelative())) {
+							// Initialize for unlighting
+							n.setLight(bank, 0, ndef);
+							b->setNodeNoCheck(x, y, z, n);
+							modified_blocks[b->getPos()]=b;
+							disappearing_lights.push(light,
+								relative_v3(x, y, z), b->getPos(), b,
+								6);
+						}
+					}
+				}
+			}
+		}
+		// Remove lights
+		unspread_light(map, ndef, bank, disappearing_lights, light_sources,
+			modified_blocks);
+		// Initialize light values for light spreading.
+		for (u8 i = 0; i <= LIGHT_SUN; i++) {
+			const std::vector<ChangingLight> &lights = light_sources.lights[i];
+			for (std::vector<ChangingLight>::const_iterator it = lights.begin();
+					it < lights.end(); it++) {
+				MapNode n = it->block->getNodeNoCheck(it->rel_position,
+					&is_valid_position);
+				n.setLight(bank, i, ndef);
+				it->block->setNodeNoCheck(it->rel_position, n);
+			}
+		}
+		// Spread lights.
+		spread_light(map, ndef, bank, light_sources, modified_blocks);
+	}
+}
+
 VoxelLineIterator::VoxelLineIterator(
 	const v3f &start_position,
 	const v3f &line_vector) :
diff --git a/src/voxelalgorithms.h b/src/voxelalgorithms.h
index 5eff8f7ac..bf1638fa3 100644
--- a/src/voxelalgorithms.h
+++ b/src/voxelalgorithms.h
@@ -22,8 +22,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "voxel.h"
 #include "mapnode.h"
-#include <set>
-#include <map>
+#include "util/container.h"
+#include "util/cpp11_container.h"
 
 class Map;
 class MapBlock;
@@ -69,11 +69,22 @@ SunlightPropagateResult propagateSunlight(VoxelManipulator &v, VoxelArea a,
  */
 void update_lighting_nodes(
 	Map *map,
-	INodeDefManager *ndef,
 	std::vector<std::pair<v3s16, MapNode> > &oldnodes,
 	std::map<v3s16, MapBlock*> &modified_blocks);
 
 /*!
+ * Updates borders of the given mapblock.
+ * Only updates if the block was marked with incomplete
+ * lighting and the neighbor is also loaded.
+ *
+ * \param block the block to update
+ * \param modified_blocks output, contains all map blocks that
+ * the function modified
+ */
+void update_block_border_lighting(Map *map, MapBlock *block,
+	std::map<v3s16, MapBlock*> &modified_blocks);
+
+/*!
  * This class iterates trough voxels that intersect with
  * a line. The collision detection does not see nodeboxes,
  * every voxel is a cube and is returned.