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authorsfan5 <sfan5@live.de>2022-06-05 18:59:53 +0200
committersfan5 <sfan5@live.de>2022-06-05 19:00:14 +0200
commit14c283a623a1c9c0015f04865655df7a225bedf9 (patch)
treed03d900108d8d82a3e17ac4d15126c0f97aec09c /src
parent4baf56520d61e22687b563d403f5d873251e135f (diff)
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Fix crash in commit a69b7abe00fb818fd88f3cd04e7f9997ffd21072
Diffstat (limited to 'src')
-rw-r--r--src/serverenvironment.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/serverenvironment.cpp b/src/serverenvironment.cpp
index 39cd7aa64..8989fb05f 100644
--- a/src/serverenvironment.cpp
+++ b/src/serverenvironment.cpp
@@ -258,6 +258,7 @@ void LBMManager::applyLBMs(ServerEnvironment *env, MapBlock *block, u32 stamp)
v3s16 pos;
MapNode n;
content_t c;
+ bool pos_valid; // dummy, we know it's valid
auto it = getLBMsIntroducedAfter(stamp);
for (; it != m_lbm_lookup.end(); ++it) {
// Cache previous version to speedup lookup which has a very high performance
@@ -268,7 +269,7 @@ void LBMManager::applyLBMs(ServerEnvironment *env, MapBlock *block, u32 stamp)
for (pos.X = 0; pos.X < MAP_BLOCKSIZE; pos.X++)
for (pos.Y = 0; pos.Y < MAP_BLOCKSIZE; pos.Y++)
for (pos.Z = 0; pos.Z < MAP_BLOCKSIZE; pos.Z++) {
- n = block->getNodeNoCheck(pos, nullptr);
+ n = block->getNodeNoCheck(pos, &pos_valid);
c = n.getContent();
// If content_t are not matching perform an LBM lookup
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 12:26:37 +0000
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/*
Minetest-c55
Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "map.h"
#include "mapsector.h"
#include "mapblock.h"
#include "main.h"
#include "client.h"
#include "filesys.h"
#include "utility.h"
#include "voxel.h"
#include "porting.h"
#include "mapgen.h"
#include "nodemetadata.h"

extern "C" {
	#include "sqlite3.h"
}
/*
	SQLite format specification:
	- Initially only replaces sectors/ and sectors2/
*/

/*
	Map
*/

Map::Map(std::ostream &dout):
	m_dout(dout),
	m_sector_cache(NULL)
{
	/*m_sector_mutex.Init();
	assert(m_sector_mutex.IsInitialized());*/
}

Map::~Map()
{
	/*
		Free all MapSectors
	*/
	core::map<v2s16, MapSector*>::Iterator i = m_sectors.getIterator();
	for(; i.atEnd() == false; i++)
	{
		MapSector *sector = i.getNode()->getValue();
		delete sector;
	}
}

void Map::addEventReceiver(MapEventReceiver *event_receiver)
{
	m_event_receivers.insert(event_receiver, false);
}

void Map::removeEventReceiver(MapEventReceiver *event_receiver)
{
	if(m_event_receivers.find(event_receiver) == NULL)
		return;
	m_event_receivers.remove(event_receiver);
}

void Map::dispatchEvent(MapEditEvent *event)
{
	for(core::map<MapEventReceiver*, bool>::Iterator
			i = m_event_receivers.getIterator();
			i.atEnd()==false; i++)
	{
		MapEventReceiver* event_receiver = i.getNode()->getKey();
		event_receiver->onMapEditEvent(event);
	}
}

MapSector * Map::getSectorNoGenerateNoExNoLock(v2s16 p)
{
	if(m_sector_cache != NULL && p == m_sector_cache_p){
		MapSector * sector = m_sector_cache;
		return sector;
	}
	
	core::map<v2s16, MapSector*>::Node *n = m_sectors.find(p);
	
	if(n == NULL)
		return NULL;
	
	MapSector *sector = n->getValue();
	
	// Cache the last result
	m_sector_cache_p = p;
	m_sector_cache = sector;

	return sector;
}

MapSector * Map::getSectorNoGenerateNoEx(v2s16 p)
{
	return getSectorNoGenerateNoExNoLock(p);
}

MapSector * Map::getSectorNoGenerate(v2s16 p)
{
	MapSector *sector = getSectorNoGenerateNoEx(p);
	if(sector == NULL)
		throw InvalidPositionException();
	
	return sector;
}

MapBlock * Map::getBlockNoCreateNoEx(v3s16 p3d)
{
	v2s16 p2d(p3d.X, p3d.Z);
	MapSector * sector = getSectorNoGenerateNoEx(p2d);
	if(sector == NULL)
		return NULL;
	MapBlock *block = sector->getBlockNoCreateNoEx(p3d.Y);
	return block;
}

MapBlock * Map::getBlockNoCreate(v3s16 p3d)
{	
	MapBlock *block = getBlockNoCreateNoEx(p3d);
	if(block == NULL)
		throw InvalidPositionException();
	return block;
}

bool Map::isNodeUnderground(v3s16 p)
{
	v3s16 blockpos = getNodeBlockPos(p);
	try{
		MapBlock * block = getBlockNoCreate(blockpos);
		return block->getIsUnderground();
	}
	catch(InvalidPositionException &e)
	{
		return false;
	}
}

bool Map::isValidPosition(v3s16 p)
{
	v3s16 blockpos = getNodeBlockPos(p);
	MapBlock *block = getBlockNoCreate(blockpos);
	return (block != NULL);
}

// Returns a CONTENT_IGNORE node if not found
MapNode Map::getNodeNoEx(v3s16 p)
{
	v3s16 blockpos = getNodeBlockPos(p);
	MapBlock *block = getBlockNoCreateNoEx(blockpos);
	if(block == NULL)
		return MapNode(CONTENT_IGNORE);
	v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
	return block->getNodeNoCheck(relpos);
}

// throws InvalidPositionException if not found
MapNode Map::getNode(v3s16 p)
{
	v3s16 blockpos = getNodeBlockPos(p);
	MapBlock *block = getBlockNoCreateNoEx(blockpos);
	if(block == NULL)
		throw InvalidPositionException();
	v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
	return block->getNodeNoCheck(relpos);
}

// throws InvalidPositionException if not found
void Map::setNode(v3s16 p, MapNode & n)
{
	v3s16 blockpos = getNodeBlockPos(p);
	MapBlock *block = getBlockNoCreate(blockpos);
	v3s16 relpos = p - blockpos*MAP_BLOCKSIZE;
	block->setNodeNoCheck(relpos, n);
}


/*
	Goes recursively through the neighbours of the node.

	Alters only transparent nodes.

	If the lighting of the neighbour is lower than the lighting of
	the node was (before changing it to 0 at the step before), the
	lighting of the neighbour is set to 0 and then the same stuff
	repeats for the neighbour.

	The ending nodes of the routine are stored in light_sources.
	This is useful when a light is removed. In such case, this
	routine can be called for the light node and then again for
	light_sources to re-light the area without the removed light.

	values of from_nodes are lighting values.
*/
void Map::unspreadLight(enum LightBank bank,
		core::map<v3s16, u8> & from_nodes,
		core::map<v3s16, bool> & light_sources,
		core::map<v3s16, MapBlock*>  & modified_blocks)
{
	v3s16 dirs[6] = {
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
	};
	
	if(from_nodes.size() == 0)
		return;
	
	u32 blockchangecount = 0;

	core::map<v3s16, u8> unlighted_nodes;
	core::map<v3s16, u8>::Iterator j;
	j = from_nodes.getIterator();

	/*
		Initialize block cache
	*/
	v3s16 blockpos_last;
	MapBlock *block = NULL;
	// Cache this a bit, too
	bool block_checked_in_modified = false;
	
	for(; j.atEnd() == false; j++)
	{
		v3s16 pos = j.getNode()->getKey();
		v3s16 blockpos = getNodeBlockPos(pos);
		
		// Only fetch a new block if the block position has changed
		try{
			if(block == NULL || blockpos != blockpos_last){
				block = getBlockNoCreate(blockpos);
				blockpos_last = blockpos;

				block_checked_in_modified = false;
				blockchangecount++;
			}
		}
		catch(InvalidPositionException &e)
		{
			continue;
		}

		if(block->isDummy())
			continue;

		// Calculate relative position in block
		v3s16 relpos = pos - blockpos_last * MAP_BLOCKSIZE;

		// Get node straight from the block
		MapNode n = block->getNode(relpos);

		u8 oldlight = j.getNode()->getValue();

		// Loop through 6 neighbors
		for(u16 i=0; i<6; i++)
		{
			// Get the position of the neighbor node
			v3s16 n2pos = pos + dirs[i];

			// Get the block where the node is located
			v3s16 blockpos = getNodeBlockPos(n2pos);

			try
			{
				// Only fetch a new block if the block position has changed
				try{
					if(block == NULL || blockpos != blockpos_last){
						block = getBlockNoCreate(blockpos);
						blockpos_last = blockpos;

						block_checked_in_modified = false;
						blockchangecount++;
					}
				}
				catch(InvalidPositionException &e)
				{
					continue;
				}

				// Calculate relative position in block
				v3s16 relpos = n2pos - blockpos * MAP_BLOCKSIZE;
				// Get node straight from the block
				MapNode n2 = block->getNode(relpos);

				bool changed = false;

				//TODO: Optimize output by optimizing light_sources?

				/*
					If the neighbor is dimmer than what was specified
					as oldlight (the light of the previous node)
				*/
				if(n2.getLight(bank) < oldlight)
				{
					/*
						And the neighbor is transparent and it has some light
					*/
					if(n2.light_propagates() && n2.getLight(bank) != 0)
					{
						/*
							Set light to 0 and add to queue
						*/

						u8 current_light = n2.getLight(bank);
						n2.setLight(bank, 0);
						block->setNode(relpos, n2);

						unlighted_nodes.insert(n2pos, current_light);
						changed = true;

						/*
							Remove from light_sources if it is there
							NOTE: This doesn't happen nearly at all
						*/
						/*if(light_sources.find(n2pos))
						{
							std::cout<<"Removed from light_sources"<<std::endl;
							light_sources.remove(n2pos);
						}*/
					}

					/*// DEBUG
					if(light_sources.find(n2pos) != NULL)
						light_sources.remove(n2pos);*/
				}
				else{
					light_sources.insert(n2pos, true);
				}

				// Add to modified_blocks
				if(changed == true && block_checked_in_modified == false)
				{
					// If the block is not found in modified_blocks, add.
					if(modified_blocks.find(blockpos) == NULL)
					{
						modified_blocks.insert(blockpos, block);
					}
					block_checked_in_modified = true;
				}
			}
			catch(InvalidPositionException &e)
			{
				continue;
			}
		}
	}

	/*dstream<<"unspreadLight(): Changed block "
			<<blockchangecount<<" times"
			<<" for "<<from_nodes.size()<<" nodes"
			<<std::endl;*/

	if(unlighted_nodes.size() > 0)
		unspreadLight(bank, unlighted_nodes, light_sources, modified_blocks);
}

/*
	A single-node wrapper of the above
*/
void Map::unLightNeighbors(enum LightBank bank,
		v3s16 pos, u8 lightwas,
		core::map<v3s16, bool> & light_sources,
		core::map<v3s16, MapBlock*>  & modified_blocks)
{
	core::map<v3s16, u8> from_nodes;
	from_nodes.insert(pos, lightwas);

	unspreadLight(bank, from_nodes, light_sources, modified_blocks);
}

/*
	Lights neighbors of from_nodes, collects all them and then
	goes on recursively.
*/
void Map::spreadLight(enum LightBank bank,
		core::map<v3s16, bool> & from_nodes,
		core::map<v3s16, MapBlock*> & modified_blocks)
{
	const v3s16 dirs[6] = {
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
	};

	if(from_nodes.size() == 0)
		return;

	u32 blockchangecount = 0;

	core::map<v3s16, bool> lighted_nodes;
	core::map<v3s16, bool>::Iterator j;
	j = from_nodes.getIterator();

	/*
		Initialize block cache
	*/
	v3s16 blockpos_last;
	MapBlock *block = NULL;
	// Cache this a bit, too
	bool block_checked_in_modified = false;

	for(; j.atEnd() == false; j++)
	//for(; j != from_nodes.end(); j++)
	{
		v3s16 pos = j.getNode()->getKey();
		//v3s16 pos = *j;
		//dstream<<"pos=("<<pos.X<<","<<pos.Y<<","<<pos.Z<<")"<<std::endl;
		v3s16 blockpos = getNodeBlockPos(pos);

		// Only fetch a new block if the block position has changed
		try{
			if(block == NULL || blockpos != blockpos_last){
				block = getBlockNoCreate(blockpos);
				blockpos_last = blockpos;

				block_checked_in_modified = false;
				blockchangecount++;
			}
		}
		catch(InvalidPositionException &e)
		{
			continue;
		}

		if(block->isDummy())
			continue;

		// Calculate relative position in block
		v3s16 relpos = pos - blockpos_last * MAP_BLOCKSIZE;

		// Get node straight from the block
		MapNode n = block->getNode(relpos);

		u8 oldlight = n.getLight(bank);
		u8 newlight = diminish_light(oldlight);

		// Loop through 6 neighbors
		for(u16 i=0; i<6; i++){
			// Get the position of the neighbor node
			v3s16 n2pos = pos + dirs[i];

			// Get the block where the node is located
			v3s16 blockpos = getNodeBlockPos(n2pos);

			try
			{
				// Only fetch a new block if the block position has changed
				try{
					if(block == NULL || blockpos != blockpos_last){
						block = getBlockNoCreate(blockpos);
						blockpos_last = blockpos;

						block_checked_in_modified = false;
						blockchangecount++;
					}
				}
				catch(InvalidPositionException &e)
				{
					continue;
				}

				// Calculate relative position in block
				v3s16 relpos = n2pos - blockpos * MAP_BLOCKSIZE;
				// Get node straight from the block
				MapNode n2 = block->getNode(relpos);

				bool changed = false;
				/*
					If the neighbor is brighter than the current node,
					add to list (it will light up this node on its turn)
				*/
				if(n2.getLight(bank) > undiminish_light(oldlight))
				{
					lighted_nodes.insert(n2pos, true);
					//lighted_nodes.push_back(n2pos);
					changed = true;
				}
				/*
					If the neighbor is dimmer than how much light this node
					would spread on it, add to list
				*/
				if(n2.getLight(bank) < newlight)
				{
					if(n2.light_propagates())
					{
						n2.setLight(bank, newlight);
						block->setNode(relpos, n2);
						lighted_nodes.insert(n2pos, true);
						//lighted_nodes.push_back(n2pos);
						changed = true;
					}
				}

				// Add to modified_blocks
				if(changed == true && block_checked_in_modified == false)
				{
					// If the block is not found in modified_blocks, add.
					if(modified_blocks.find(blockpos) == NULL)
					{
						modified_blocks.insert(blockpos, block);
					}
					block_checked_in_modified = true;
				}
			}
			catch(InvalidPositionException &e)
			{
				continue;
			}
		}
	}

	/*dstream<<"spreadLight(): Changed block "
			<<blockchangecount<<" times"
			<<" for "<<from_nodes.size()<<" nodes"
			<<std::endl;*/

	if(lighted_nodes.size() > 0)
		spreadLight(bank, lighted_nodes, modified_blocks);
}

/*
	A single-node source variation of the above.
*/
void Map::lightNeighbors(enum LightBank bank,
		v3s16 pos,
		core::map<v3s16, MapBlock*> & modified_blocks)
{
	core::map<v3s16, bool> from_nodes;
	from_nodes.insert(pos, true);
	spreadLight(bank, from_nodes, modified_blocks);
}

v3s16 Map::getBrightestNeighbour(enum LightBank bank, v3s16 p)
{
	v3s16 dirs[6] = {
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
	};

	u8 brightest_light = 0;
	v3s16 brightest_pos(0,0,0);
	bool found_something = false;

	// Loop through 6 neighbors
	for(u16 i=0; i<6; i++){
		// Get the position of the neighbor node
		v3s16 n2pos = p + dirs[i];
		MapNode n2;
		try{
			n2 = getNode(n2pos);
		}
		catch(InvalidPositionException &e)
		{
			continue;
		}
		if(n2.getLight(bank) > brightest_light || found_something == false){
			brightest_light = n2.getLight(bank);
			brightest_pos = n2pos;
			found_something = true;
		}
	}

	if(found_something == false)
		throw InvalidPositionException();

	return brightest_pos;
}

/*
	Propagates sunlight down from a node.
	Starting point gets sunlight.

	Returns the lowest y value of where the sunlight went.

	Mud is turned into grass in where the sunlight stops.
*/
s16 Map::propagateSunlight(v3s16 start,
		core::map<v3s16, MapBlock*> & modified_blocks)
{
	s16 y = start.Y;
	for(; ; y--)
	{
		v3s16 pos(start.X, y, start.Z);

		v3s16 blockpos = getNodeBlockPos(pos);
		MapBlock *block;
		try{
			block = getBlockNoCreate(blockpos);
		}
		catch(InvalidPositionException &e)
		{
			break;
		}

		v3s16 relpos = pos - blockpos*MAP_BLOCKSIZE;
		MapNode n = block->getNode(relpos);

		if(n.sunlight_propagates())
		{
			n.setLight(LIGHTBANK_DAY, LIGHT_SUN);
			block->setNode(relpos, n);

			modified_blocks.insert(blockpos, block);
		}
		else
		{
			/*// Turn mud into grass
			if(n.getContent() == CONTENT_MUD)
			{
				n.setContent(CONTENT_GRASS);
				block->setNode(relpos, n);
				modified_blocks.insert(blockpos, block);
			}*/

			// Sunlight goes no further
			break;
		}
	}
	return y + 1;
}

void Map::updateLighting(enum LightBank bank,
		core::map<v3s16, MapBlock*> & a_blocks,
		core::map<v3s16, MapBlock*> & modified_blocks)
{
	/*m_dout<<DTIME<<"Map::updateLighting(): "
			<<a_blocks.size()<<" blocks."<<std::endl;*/

	//TimeTaker timer("updateLighting");

	// For debugging
	//bool debug=true;
	//u32 count_was = modified_blocks.size();

	core::map<v3s16, MapBlock*> blocks_to_update;

	core::map<v3s16, bool> light_sources;

	core::map<v3s16, u8> unlight_from;

	core::map<v3s16, MapBlock*>::Iterator i;
	i = a_blocks.getIterator();
	for(; i.atEnd() == false; i++)
	{
		MapBlock *block = i.getNode()->getValue();

		for(;;)
		{
			// Don't bother with dummy blocks.
			if(block->isDummy())
				break;

			v3s16 pos = block->getPos();
			modified_blocks.insert(pos, block);

			blocks_to_update.insert(pos, block);

			/*
				Clear all light from block
			*/
			for(s16 z=0; z<MAP_BLOCKSIZE; z++)
			for(s16 x=0; x<MAP_BLOCKSIZE; x++)
			for(s16 y=0; y<MAP_BLOCKSIZE; y++)
			{

				try{
					v3s16 p(x,y,z);
					MapNode n = block->getNode(v3s16(x,y,z));
					u8 oldlight = n.getLight(bank);
					n.setLight(bank, 0);
					block->setNode(v3s16(x,y,z), n);

					// Collect borders for unlighting
					if(x==0 || x == MAP_BLOCKSIZE-1
					|| y==0 || y == MAP_BLOCKSIZE-1
					|| z==0 || z == MAP_BLOCKSIZE-1)
					{
						v3s16 p_map = p + v3s16(
								MAP_BLOCKSIZE*pos.X,
								MAP_BLOCKSIZE*pos.Y,
								MAP_BLOCKSIZE*pos.Z);
						unlight_from.insert(p_map, oldlight);
					}
				}
				catch(InvalidPositionException &e)
				{
					/*
						This would happen when dealing with a
						dummy block.
					*/
					//assert(0);
					dstream<<"updateLighting(): InvalidPositionException"
							<<std::endl;
				}
			}

			if(bank == LIGHTBANK_DAY)
			{
				bool bottom_valid = block->propagateSunlight(light_sources);

				// If bottom is valid, we're done.
				if(bottom_valid)
					break;
			}
			else if(bank == LIGHTBANK_NIGHT)
			{
				// For night lighting, sunlight is not propagated
				break;
			}
			else
			{
				// Invalid lighting bank
				assert(0);
			}

			/*dstream<<"Bottom for sunlight-propagated block ("
					<<pos.X<<","<<pos.Y<<","<<pos.Z<<") not valid"
					<<std::endl;*/

			// Bottom sunlight is not valid; get the block and loop to it

			pos.Y--;
			try{
				block = getBlockNoCreate(pos);
			}
			catch(InvalidPositionException &e)
			{
				assert(0);
			}

		}
	}
	
	/*
		Enable this to disable proper lighting for speeding up map
		generation for testing or whatever
	*/
#if 0
	//if(g_settings.get(""))
	{
		core::map<v3s16, MapBlock*>::Iterator i;
		i = blocks_to_update.getIterator();
		for(; i.atEnd() == false; i++)
		{
			MapBlock *block = i.getNode()->getValue();
			v3s16 p = block->getPos();
			block->setLightingExpired(false);
		}
		return;
	}
#endif

#if 0
	{
		TimeTaker timer("unspreadLight");
		unspreadLight(bank, unlight_from, light_sources, modified_blocks);
	}

	if(debug)
	{
		u32 diff = modified_blocks.size() - count_was;
		count_was = modified_blocks.size();
		dstream<<"unspreadLight modified "<<diff<<std::endl;
	}

	{
		TimeTaker timer("spreadLight");
		spreadLight(bank, light_sources, modified_blocks);
	}

	if(debug)
	{
		u32 diff = modified_blocks.size() - count_was;
		count_was = modified_blocks.size();
		dstream<<"spreadLight modified "<<diff<<std::endl;
	}
#endif

	{
		//MapVoxelManipulator vmanip(this);

		// Make a manual voxel manipulator and load all the blocks
		// that touch the requested blocks
		ManualMapVoxelManipulator vmanip(this);
		core::map<v3s16, MapBlock*>::Iterator i;
		i = blocks_to_update.getIterator();
		for(; i.atEnd() == false; i++)
		{
			MapBlock *block = i.getNode()->getValue();
			v3s16 p = block->getPos();

			// Add all surrounding blocks
			vmanip.initialEmerge(p - v3s16(1,1,1), p + v3s16(1,1,1));

			/*
				Add all surrounding blocks that have up-to-date lighting
				NOTE: This doesn't quite do the job (not everything
					  appropriate is lighted)
			*/
			/*for(s16 z=-1; z<=1; z++)
			for(s16 y=-1; y<=1; y++)
			for(s16 x=-1; x<=1; x++)
			{
				v3s16 p(x,y,z);
				MapBlock *block = getBlockNoCreateNoEx(p);
				if(block == NULL)
					continue;
				if(block->isDummy())
					continue;
				if(block->getLightingExpired())
					continue;
				vmanip.initialEmerge(p, p);
			}*/

			// Lighting of block will be updated completely
			block->setLightingExpired(false);
		}

		{
			//TimeTaker timer("unSpreadLight");
			vmanip.unspreadLight(bank, unlight_from, light_sources);
		}
		{
			//TimeTaker timer("spreadLight");
			vmanip.spreadLight(bank, light_sources);
		}
		{
			//TimeTaker timer("blitBack");
			vmanip.blitBack(modified_blocks);
		}
		/*dstream<<"emerge_time="<<emerge_time<<std::endl;
		emerge_time = 0;*/
	}

	//m_dout<<"Done ("<<getTimestamp()<<")"<<std::endl;
}

void Map::updateLighting(core::map<v3s16, MapBlock*> & a_blocks,
		core::map<v3s16, MapBlock*> & modified_blocks)
{
	updateLighting(LIGHTBANK_DAY, a_blocks, modified_blocks);
	updateLighting(LIGHTBANK_NIGHT, a_blocks, modified_blocks);

	/*
		Update information about whether day and night light differ
	*/
	for(core::map<v3s16, MapBlock*>::Iterator
			i = modified_blocks.getIterator();
			i.atEnd() == false; i++)
	{
		MapBlock *block = i.getNode()->getValue();
		block->updateDayNightDiff();
	}
}

/*
*/
void Map::addNodeAndUpdate(v3s16 p, MapNode n,
		core::map<v3s16, MapBlock*> &modified_blocks)
{
	/*PrintInfo(m_dout);
	m_dout<<DTIME<<"Map::addNodeAndUpdate(): p=("
			<<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/

	/*
		From this node to nodes underneath:
		If lighting is sunlight (1.0), unlight neighbours and
		set lighting to 0.
		Else discontinue.
	*/

	v3s16 toppos = p + v3s16(0,1,0);
	v3s16 bottompos = p + v3s16(0,-1,0);

	bool node_under_sunlight = true;
	core::map<v3s16, bool> light_sources;

	/*
		If there is a node at top and it doesn't have sunlight,
		there has not been any sunlight going down.

		Otherwise there probably is.
	*/
	try{
		MapNode topnode = getNode(toppos);

		if(topnode.getLight(LIGHTBANK_DAY) != LIGHT_SUN)
			node_under_sunlight = false;
	}
	catch(InvalidPositionException &e)
	{
	}

#if 0
	/*
		If the new node is solid and there is grass below, change it to mud
	*/
	if(content_features(n).walkable == true)
	{
		try{
			MapNode bottomnode = getNode(bottompos);

			if(bottomnode.getContent() == CONTENT_GRASS
					|| bottomnode.getContent() == CONTENT_GRASS_FOOTSTEPS)
			{
				bottomnode.setContent(CONTENT_MUD);
				setNode(bottompos, bottomnode);
			}
		}
		catch(InvalidPositionException &e)
		{
		}
	}
#endif

#if 0
	/*
		If the new node is mud and it is under sunlight, change it
		to grass
	*/
	if(n.getContent() == CONTENT_MUD && node_under_sunlight)
	{
		n.setContent(CONTENT_GRASS);
	}
#endif

	/*
		Remove all light that has come out of this node
	*/

	enum LightBank banks[] =
	{
		LIGHTBANK_DAY,
		LIGHTBANK_NIGHT
	};
	for(s32 i=0; i<2; i++)
	{
		enum LightBank bank = banks[i];

		u8 lightwas = getNode(p).getLight(bank);

		// Add the block of the added node to modified_blocks
		v3s16 blockpos = getNodeBlockPos(p);
		MapBlock * block = getBlockNoCreate(blockpos);
		assert(block != NULL);
		modified_blocks.insert(blockpos, block);

		assert(isValidPosition(p));

		// Unlight neighbours of node.
		// This means setting light of all consequent dimmer nodes
		// to 0.
		// This also collects the nodes at the border which will spread
		// light again into this.
		unLightNeighbors(bank, p, lightwas, light_sources, modified_blocks);

		n.setLight(bank, 0);
	}

	/*
		If node lets sunlight through and is under sunlight, it has
		sunlight too.
	*/
	if(node_under_sunlight && content_features(n).sunlight_propagates)
	{
		n.setLight(LIGHTBANK_DAY, LIGHT_SUN);
	}

	/*
		Set the node on the map
	*/

	setNode(p, n);

	/*
		Add intial metadata
	*/

	NodeMetadata *meta_proto = content_features(n).initial_metadata;
	if(meta_proto)
	{
		NodeMetadata *meta = meta_proto->clone();
		setNodeMetadata(p, meta);
	}

	/*
		If node is under sunlight and doesn't let sunlight through,
		take all sunlighted nodes under it and clear light from them
		and from where the light has been spread.
		TODO: This could be optimized by mass-unlighting instead
			  of looping
	*/
	if(node_under_sunlight && !content_features(n).sunlight_propagates)
	{
		s16 y = p.Y - 1;
		for(;; y--){
			//m_dout<<DTIME<<"y="<<y<<std::endl;
			v3s16 n2pos(p.X, y, p.Z);

			MapNode n2;
			try{
				n2 = getNode(n2pos);
			}
			catch(InvalidPositionException &e)
			{
				break;
			}

			if(n2.getLight(LIGHTBANK_DAY) == LIGHT_SUN)
			{
				unLightNeighbors(LIGHTBANK_DAY,
						n2pos, n2.getLight(LIGHTBANK_DAY),
						light_sources, modified_blocks);
				n2.setLight(LIGHTBANK_DAY, 0);
				setNode(n2pos, n2);
			}
			else
				break;
		}
	}

	for(s32 i=0; i<2; i++)
	{
		enum LightBank bank = banks[i];

		/*
			Spread light from all nodes that might be capable of doing so
		*/
		spreadLight(bank, light_sources, modified_blocks);
	}

	/*
		Update information about whether day and night light differ
	*/
	for(core::map<v3s16, MapBlock*>::Iterator
			i = modified_blocks.getIterator();
			i.atEnd() == false; i++)
	{
		MapBlock *block = i.getNode()->getValue();
		block->updateDayNightDiff();
	}

	/*
		Add neighboring liquid nodes and the node itself if it is
		liquid (=water node was added) to transform queue.
	*/
	v3s16 dirs[7] = {
		v3s16(0,0,0), // self
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
	};
	for(u16 i=0; i<7; i++)
	{
		try
		{

		v3s16 p2 = p + dirs[i];

		MapNode n2 = getNode(p2);
		if(content_liquid(n2.getContent()) || n2.getContent() == CONTENT_AIR)
		{
			m_transforming_liquid.push_back(p2);
		}

		}catch(InvalidPositionException &e)
		{
		}
	}
}

/*
*/
void Map::removeNodeAndUpdate(v3s16 p,
		core::map<v3s16, MapBlock*> &modified_blocks)
{
	/*PrintInfo(m_dout);
	m_dout<<DTIME<<"Map::removeNodeAndUpdate(): p=("
			<<p.X<<","<<p.Y<<","<<p.Z<<")"<<std::endl;*/

	bool node_under_sunlight = true;

	v3s16 toppos = p + v3s16(0,1,0);

	// Node will be replaced with this
	content_t replace_material = CONTENT_AIR;

	/*
		If there is a node at top and it doesn't have sunlight,
		there will be no sunlight going down.
	*/
	try{
		MapNode topnode = getNode(toppos);

		if(topnode.getLight(LIGHTBANK_DAY) != LIGHT_SUN)
			node_under_sunlight = false;
	}
	catch(InvalidPositionException &e)
	{
	}

	core::map<v3s16, bool> light_sources;

	enum LightBank banks[] =
	{
		LIGHTBANK_DAY,
		LIGHTBANK_NIGHT
	};
	for(s32 i=0; i<2; i++)
	{
		enum LightBank bank = banks[i];

		/*
			Unlight neighbors (in case the node is a light source)
		*/
		unLightNeighbors(bank, p,
				getNode(p).getLight(bank),
				light_sources, modified_blocks);
	}

	/*
		Remove node metadata
	*/

	removeNodeMetadata(p);

	/*
		Remove the node.
		This also clears the lighting.
	*/

	MapNode n;
	n.setContent(replace_material);
	setNode(p, n);

	for(s32 i=0; i<2; i++)
	{
		enum LightBank bank = banks[i];

		/*
			Recalculate lighting
		*/
		spreadLight(bank, light_sources, modified_blocks);
	}

	// Add the block of the removed node to modified_blocks
	v3s16 blockpos = getNodeBlockPos(p);
	MapBlock * block = getBlockNoCreate(blockpos);
	assert(block != NULL);
	modified_blocks.insert(blockpos, block);

	/*
		If the removed node was under sunlight, propagate the
		sunlight down from it and then light all neighbors
		of the propagated blocks.
	*/
	if(node_under_sunlight)
	{
		s16 ybottom = propagateSunlight(p, modified_blocks);
		/*m_dout<<DTIME<<"Node was under sunlight. "
				"Propagating sunlight";
		m_dout<<DTIME<<" -> ybottom="<<ybottom<<std::endl;*/
		s16 y = p.Y;
		for(; y >= ybottom; y--)
		{
			v3s16 p2(p.X, y, p.Z);
			/*m_dout<<DTIME<<"lighting neighbors of node ("
					<<p2.X<<","<<p2.Y<<","<<p2.Z<<")"
					<<std::endl;*/
			lightNeighbors(LIGHTBANK_DAY, p2, modified_blocks);
		}
	}
	else
	{
		// Set the lighting of this node to 0
		// TODO: Is this needed? Lighting is cleared up there already.
		try{
			MapNode n = getNode(p);
			n.setLight(LIGHTBANK_DAY, 0);
			setNode(p, n);
		}
		catch(InvalidPositionException &e)
		{
			assert(0);
		}
	}

	for(s32 i=0; i<2; i++)
	{
		enum LightBank bank = banks[i];

		// Get the brightest neighbour node and propagate light from it
		v3s16 n2p = getBrightestNeighbour(bank, p);
		try{
			MapNode n2 = getNode(n2p);
			lightNeighbors(bank, n2p, modified_blocks);
		}
		catch(InvalidPositionException &e)
		{
		}
	}

	/*
		Update information about whether day and night light differ
	*/
	for(core::map<v3s16, MapBlock*>::Iterator
			i = modified_blocks.getIterator();
			i.atEnd() == false; i++)
	{
		MapBlock *block = i.getNode()->getValue();
		block->updateDayNightDiff();
	}

	/*
		Add neighboring liquid nodes and this node to transform queue.
		(it's vital for the node itself to get updated last.)
	*/
	v3s16 dirs[7] = {
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
		v3s16(0,0,0), // self
	};
	for(u16 i=0; i<7; i++)
	{
		try
		{

		v3s16 p2 = p + dirs[i];

		MapNode n2 = getNode(p2);
		if(content_liquid(n2.getContent()) || n2.getContent() == CONTENT_AIR)
		{
			m_transforming_liquid.push_back(p2);
		}

		}catch(InvalidPositionException &e)
		{
		}
	}
}

bool Map::addNodeWithEvent(v3s16 p, MapNode n)
{
	MapEditEvent event;
	event.type = MEET_ADDNODE;
	event.p = p;
	event.n = n;

	bool succeeded = true;
	try{
		core::map<v3s16, MapBlock*> modified_blocks;
		addNodeAndUpdate(p, n, modified_blocks);

		// Copy modified_blocks to event
		for(core::map<v3s16, MapBlock*>::Iterator
				i = modified_blocks.getIterator();
				i.atEnd()==false; i++)
		{
			event.modified_blocks.insert(i.getNode()->getKey(), false);
		}
	}
	catch(InvalidPositionException &e){
		succeeded = false;
	}

	dispatchEvent(&event);

	return succeeded;
}

bool Map::removeNodeWithEvent(v3s16 p)
{
	MapEditEvent event;
	event.type = MEET_REMOVENODE;
	event.p = p;

	bool succeeded = true;
	try{
		core::map<v3s16, MapBlock*> modified_blocks;
		removeNodeAndUpdate(p, modified_blocks);

		// Copy modified_blocks to event
		for(core::map<v3s16, MapBlock*>::Iterator
				i = modified_blocks.getIterator();
				i.atEnd()==false; i++)
		{
			event.modified_blocks.insert(i.getNode()->getKey(), false);
		}
	}
	catch(InvalidPositionException &e){
		succeeded = false;
	}

	dispatchEvent(&event);

	return succeeded;
}

bool Map::dayNightDiffed(v3s16 blockpos)
{
	try{
		v3s16 p = blockpos + v3s16(0,0,0);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}
	// Leading edges
	try{
		v3s16 p = blockpos + v3s16(-1,0,0);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}
	try{
		v3s16 p = blockpos + v3s16(0,-1,0);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}
	try{
		v3s16 p = blockpos + v3s16(0,0,-1);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}
	// Trailing edges
	try{
		v3s16 p = blockpos + v3s16(1,0,0);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}
	try{
		v3s16 p = blockpos + v3s16(0,1,0);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}
	try{
		v3s16 p = blockpos + v3s16(0,0,1);
		MapBlock *b = getBlockNoCreate(p);
		if(b->dayNightDiffed())
			return true;
	}
	catch(InvalidPositionException &e){}

	return false;
}

/*
	Updates usage timers
*/
void Map::timerUpdate(float dtime, float unload_timeout,
		core::list<v3s16> *unloaded_blocks)
{
	bool save_before_unloading = (mapType() == MAPTYPE_SERVER);
	
	core::list<v2s16> sector_deletion_queue;
	u32 deleted_blocks_count = 0;
	u32 saved_blocks_count = 0;

	core::map<v2s16, MapSector*>::Iterator si;

	si = m_sectors.getIterator();
	for(; si.atEnd() == false; si++)
	{
		MapSector *sector = si.getNode()->getValue();

		bool all_blocks_deleted = true;

		core::list<MapBlock*> blocks;
		sector->getBlocks(blocks);
		for(core::list<MapBlock*>::Iterator i = blocks.begin();
				i != blocks.end(); i++)
		{
			MapBlock *block = (*i);
			
			block->incrementUsageTimer(dtime);
			
			if(block->getUsageTimer() > unload_timeout)
			{
				v3s16 p = block->getPos();

				// Save if modified
				if(block->getModified() != MOD_STATE_CLEAN
						&& save_before_unloading)
				{
					saveBlock(block);
					saved_blocks_count++;
				}

				// Delete from memory
				sector->deleteBlock(block);

				if(unloaded_blocks)
					unloaded_blocks->push_back(p);

				deleted_blocks_count++;
			}
			else
			{
				all_blocks_deleted = false;
			}
		}

		if(all_blocks_deleted)
		{
			sector_deletion_queue.push_back(si.getNode()->getKey());
		}
	}
	
	// Finally delete the empty sectors
	deleteSectors(sector_deletion_queue);
	
	if(deleted_blocks_count != 0)
	{
		PrintInfo(dstream); // ServerMap/ClientMap:
		dstream<<"Unloaded "<<deleted_blocks_count
				<<" blocks from memory";
		if(save_before_unloading)
			dstream<<", of which "<<saved_blocks_count<<" were written";
		dstream<<"."<<std::endl;
	}
}

void Map::deleteSectors(core::list<v2s16> &list)
{
	core::list<v2s16>::Iterator j;
	for(j=list.begin(); j!=list.end(); j++)
	{
		MapSector *sector = m_sectors[*j];
		// If sector is in sector cache, remove it from there
		if(m_sector_cache == sector)
			m_sector_cache = NULL;
		// Remove from map and delete
		m_sectors.remove(*j);
		delete sector;
	}
}

#if 0
void Map::unloadUnusedData(float timeout,
		core::list<v3s16> *deleted_blocks)
{
	core::list<v2s16> sector_deletion_queue;
	u32 deleted_blocks_count = 0;
	u32 saved_blocks_count = 0;

	core::map<v2s16, MapSector*>::Iterator si = m_sectors.getIterator();
	for(; si.atEnd() == false; si++)
	{
		MapSector *sector = si.getNode()->getValue();

		bool all_blocks_deleted = true;

		core::list<MapBlock*> blocks;
		sector->getBlocks(blocks);
		for(core::list<MapBlock*>::Iterator i = blocks.begin();
				i != blocks.end(); i++)
		{
			MapBlock *block = (*i);
			
			if(block->getUsageTimer() > timeout)
			{
				// Save if modified
				if(block->getModified() != MOD_STATE_CLEAN)
				{
					saveBlock(block);
					saved_blocks_count++;
				}
				// Delete from memory
				sector->deleteBlock(block);
				deleted_blocks_count++;
			}
			else
			{
				all_blocks_deleted = false;
			}
		}

		if(all_blocks_deleted)
		{
			sector_deletion_queue.push_back(si.getNode()->getKey());
		}
	}

	deleteSectors(sector_deletion_queue);

	dstream<<"Map: Unloaded "<<deleted_blocks_count<<" blocks from memory"
			<<", of which "<<saved_blocks_count<<" were wr."
			<<std::endl;

	//return sector_deletion_queue.getSize();
	//return deleted_blocks_count;
}
#endif

void Map::PrintInfo(std::ostream &out)
{
	out<<"Map: ";
}

#define WATER_DROP_BOOST 4

enum NeighborType {
	NEIGHBOR_UPPER,
	NEIGHBOR_SAME_LEVEL,
	NEIGHBOR_LOWER
};
struct NodeNeighbor {
	MapNode n;
	NeighborType t;
	v3s16 p;
};

void Map::transformLiquids(core::map<v3s16, MapBlock*> & modified_blocks)
{
	DSTACK(__FUNCTION_NAME);
	//TimeTaker timer("transformLiquids()");

	u32 loopcount = 0;
	u32 initial_size = m_transforming_liquid.size();

	/*if(initial_size != 0)
		dstream<<"transformLiquids(): initial_size="<<initial_size<<std::endl;*/

	// list of nodes that due to viscosity have not reached their max level height
	UniqueQueue<v3s16> must_reflow;

	while(m_transforming_liquid.size() != 0)
	{
		// This should be done here so that it is done when continue is used
		if(loopcount >= initial_size * 3)
			break;
		loopcount++;

		/*
			Get a queued transforming liquid node
		*/
		v3s16 p0 = m_transforming_liquid.pop_front();

		MapNode n0 = getNodeNoEx(p0);

		/*
			Collect information about current node
		 */
		s8 liquid_level = -1;
		u8 liquid_kind = CONTENT_IGNORE;
		LiquidType liquid_type = content_features(n0.getContent()).liquid_type;
		switch (liquid_type) {
			case LIQUID_SOURCE:
				liquid_level = LIQUID_LEVEL_SOURCE;
				liquid_kind = content_features(n0.getContent()).liquid_alternative_flowing;
				break;
			case LIQUID_FLOWING:
				liquid_level = (n0.param2 & LIQUID_LEVEL_MASK);
				liquid_kind = n0.getContent();
				break;
			case LIQUID_NONE:
				// if this is an air node, it *could* be transformed into a liquid. otherwise,
				// continue with the next node.
				if (n0.getContent() != CONTENT_AIR)
					continue;
				liquid_kind = CONTENT_AIR;
				break;
		}

		/*
			Collect information about the environment
		 */
		const v3s16 *dirs = g_6dirs;
		NodeNeighbor sources[6]; // surrounding sources
		int num_sources = 0;
		NodeNeighbor flows[6]; // surrounding flowing liquid nodes
		int num_flows = 0;
		NodeNeighbor airs[6]; // surrounding air
		int num_airs = 0;
		NodeNeighbor neutrals[6]; // nodes that are solid or another kind of liquid
		int num_neutrals = 0;
		bool flowing_down = false;
		for (u16 i = 0; i < 6; i++) {
			NeighborType nt = NEIGHBOR_SAME_LEVEL;
			switch (i) {
				case 1:
					nt = NEIGHBOR_UPPER;
					break;
				case 4:
					nt = NEIGHBOR_LOWER;
					break;
			}
			v3s16 npos = p0 + dirs[i];
			NodeNeighbor nb = {getNodeNoEx(npos), nt, npos};
			switch (content_features(nb.n.getContent()).liquid_type) {
				case LIQUID_NONE:
					if (nb.n.getContent() == CONTENT_AIR) {
						airs[num_airs++] = nb;
						// if the current node is a water source the neighbor
						// should be enqueded for transformation regardless of whether the
						// current node changes or not.
						if (nb.t != NEIGHBOR_UPPER && liquid_type != LIQUID_NONE)
							m_transforming_liquid.push_back(npos);
						// if the current node happens to be a flowing node, it will start to flow down here.
						if (nb.t == NEIGHBOR_LOWER) {
							flowing_down = true;
						}
					} else {
						neutrals[num_neutrals++] = nb;
					}
					break;
				case LIQUID_SOURCE:
					// if this node is not (yet) of a liquid type, choose the first liquid type we encounter 
					if (liquid_kind == CONTENT_AIR)
						liquid_kind = content_features(nb.n.getContent()).liquid_alternative_flowing;
					if (content_features(nb.n.getContent()).liquid_alternative_flowing !=liquid_kind) {
						neutrals[num_neutrals++] = nb;
					} else {
						sources[num_sources++] = nb;
					}
					break;
				case LIQUID_FLOWING:
					// if this node is not (yet) of a liquid type, choose the first liquid type we encounter
					if (liquid_kind == CONTENT_AIR)
						liquid_kind = content_features(nb.n.getContent()).liquid_alternative_flowing;
					if (content_features(nb.n.getContent()).liquid_alternative_flowing != liquid_kind) {
						neutrals[num_neutrals++] = nb;
					} else {
						flows[num_flows++] = nb;
						if (nb.t == NEIGHBOR_LOWER)
							flowing_down = true;
					}
					break;
			}
		}

		/*
			decide on the type (and possibly level) of the current node
		 */
		content_t new_node_content;
		s8 new_node_level = -1;
		s8 max_node_level = -1;
		if (num_sources >= 2 || liquid_type == LIQUID_SOURCE) {
			// liquid_kind will be set to either the flowing alternative of the node (if it's a liquid)
			// or the flowing alternative of the first of the surrounding sources (if it's air), so
			// it's perfectly safe to use liquid_kind here to determine the new node content.
			new_node_content = content_features(liquid_kind).liquid_alternative_source;
		} else if (num_sources == 1 && sources[0].t != NEIGHBOR_LOWER) {
			// liquid_kind is set properly, see above
			new_node_content = liquid_kind;
			max_node_level = new_node_level = LIQUID_LEVEL_MAX;
		} else {
			// no surrounding sources, so get the maximum level that can flow into this node
			for (u16 i = 0; i < num_flows; i++) {
				u8 nb_liquid_level = (flows[i].n.param2 & LIQUID_LEVEL_MASK);
				switch (flows[i].t) {
					case NEIGHBOR_UPPER:
						if (nb_liquid_level + WATER_DROP_BOOST > max_node_level) {
							max_node_level = LIQUID_LEVEL_MAX;
							if (nb_liquid_level + WATER_DROP_BOOST < LIQUID_LEVEL_MAX)
								max_node_level = nb_liquid_level + WATER_DROP_BOOST;
						}
						break;
					case NEIGHBOR_LOWER:
						break;
					case NEIGHBOR_SAME_LEVEL:
						if ((flows[i].n.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK &&
							nb_liquid_level > 0 && nb_liquid_level - 1 > max_node_level) {
							max_node_level = nb_liquid_level - 1;
						}
						break;
				}
			}

			u8 viscosity = content_features(liquid_kind).liquid_viscosity;
			if (viscosity > 1 && max_node_level != liquid_level) {
				// amount to gain, limited by viscosity
				// must be at least 1 in absolute value
				s8 level_inc = max_node_level - liquid_level;
				if (level_inc < -viscosity || level_inc > viscosity)
					new_node_level = liquid_level + level_inc/viscosity;
				else if (level_inc < 0)
					new_node_level = liquid_level - 1;
				else if (level_inc > 0)
					new_node_level = liquid_level + 1;
				if (new_node_level != max_node_level)
					must_reflow.push_back(p0);
			} else
				new_node_level = max_node_level;

			if (new_node_level >= 0)
				new_node_content = liquid_kind;
			else
				new_node_content = CONTENT_AIR;

		}

		/*
			check if anything has changed. if not, just continue with the next node.
		 */
		if (new_node_content == n0.getContent() && (content_features(n0.getContent()).liquid_type != LIQUID_FLOWING ||
										 ((n0.param2 & LIQUID_LEVEL_MASK) == (u8)new_node_level &&
										 ((n0.param2 & LIQUID_FLOW_DOWN_MASK) == LIQUID_FLOW_DOWN_MASK)
										 == flowing_down)))
			continue;


		/*
			update the current node
		 */
		bool flow_down_enabled = (flowing_down && ((n0.param2 & LIQUID_FLOW_DOWN_MASK) != LIQUID_FLOW_DOWN_MASK));
		if (content_features(new_node_content).liquid_type == LIQUID_FLOWING) {
			// set level to last 3 bits, flowing down bit to 4th bit
			n0.param2 = (flowing_down ? LIQUID_FLOW_DOWN_MASK : 0x00) | (new_node_level & LIQUID_LEVEL_MASK);
		} else {
			// set the liquid level and flow bit to 0
			n0.param2 = ~(LIQUID_LEVEL_MASK | LIQUID_FLOW_DOWN_MASK);
		}
		n0.setContent(new_node_content);
		setNode(p0, n0);
		v3s16 blockpos = getNodeBlockPos(p0);
		MapBlock *block = getBlockNoCreateNoEx(blockpos);
		if(block != NULL)
			modified_blocks.insert(blockpos, block);

		/*
			enqueue neighbors for update if neccessary
		 */
		switch (content_features(n0.getContent()).liquid_type) {
			case LIQUID_SOURCE:
			case LIQUID_FLOWING:
				// make sure source flows into all neighboring nodes
				for (u16 i = 0; i < num_flows; i++)
					if (flows[i].t != NEIGHBOR_UPPER)
						m_transforming_liquid.push_back(flows[i].p);
				for (u16 i = 0; i < num_airs; i++)
					if (airs[i].t != NEIGHBOR_UPPER)
						m_transforming_liquid.push_back(airs[i].p);
				break;
			case LIQUID_NONE:
				// this flow has turned to air; neighboring flows might need to do the same
				for (u16 i = 0; i < num_flows; i++)
					m_transforming_liquid.push_back(flows[i].p);
				break;
		}
	}
	//dstream<<"Map::transformLiquids(): loopcount="<<loopcount<<std::endl;
	while (must_reflow.size() > 0)
		m_transforming_liquid.push_back(must_reflow.pop_front());
}

NodeMetadata* Map::getNodeMetadata(v3s16 p)
{
	v3s16 blockpos = getNodeBlockPos(p);
	v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
	MapBlock *block = getBlockNoCreateNoEx(blockpos);
	if(block == NULL)
	{
		dstream<<"WARNING: Map::setNodeMetadata(): Block not found"
				<<std::endl;
		return NULL;
	}
	NodeMetadata *meta = block->m_node_metadata.get(p_rel);
	return meta;
}

void Map::setNodeMetadata(v3s16 p, NodeMetadata *meta)
{
	v3s16 blockpos = getNodeBlockPos(p);
	v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
	MapBlock *block = getBlockNoCreateNoEx(blockpos);
	if(block == NULL)
	{
		dstream<<"WARNING: Map::setNodeMetadata(): Block not found"
				<<std::endl;
		return;
	}
	block->m_node_metadata.set(p_rel, meta);
}

void Map::removeNodeMetadata(v3s16 p)
{
	v3s16 blockpos = getNodeBlockPos(p);
	v3s16 p_rel = p - blockpos*MAP_BLOCKSIZE;
	MapBlock *block = getBlockNoCreateNoEx(blockpos);
	if(block == NULL)
	{
		dstream<<"WARNING: Map::removeNodeMetadata(): Block not found"
				<<std::endl;
		return;
	}
	block->m_node_metadata.remove(p_rel);
}

void Map::nodeMetadataStep(float dtime,
		core::map<v3s16, MapBlock*> &changed_blocks)
{
	/*
		NOTE:
		Currently there is no way to ensure that all the necessary
		blocks are loaded when this is run. (They might get unloaded)
		NOTE: ^- Actually, that might not be so. In a quick test it
		reloaded a block with a furnace when I walked back to it from
		a distance.
	*/
	core::map<v2s16, MapSector*>::Iterator si;
	si = m_sectors.getIterator();
	for(; si.atEnd() == false; si++)
	{
		MapSector *sector = si.getNode()->getValue();
		core::list< MapBlock * > sectorblocks;
		sector->getBlocks(sectorblocks);
		core::list< MapBlock * >::Iterator i;
		for(i=sectorblocks.begin(); i!=sectorblocks.end(); i++)
		{
			MapBlock *block = *i;
			bool changed = block->m_node_metadata.step(dtime);
			if(changed)
				changed_blocks[block->getPos()] = block;
		}
	}
}

/*
	ServerMap
*/

ServerMap::ServerMap(std::string savedir):
	Map(dout_server),
	m_seed(0),
	m_map_metadata_changed(true)
{
	dstream<<__FUNCTION_NAME<<std::endl;

	//m_chunksize = 8; // Takes a few seconds

	m_seed = (((u64)(myrand()%0xffff)<<0)
			+ ((u64)(myrand()%0xffff)<<16)
			+ ((u64)(myrand()%0xffff)<<32)
			+ ((u64)(myrand()%0xffff)<<48));

	/*
		Experimental and debug stuff
	*/

	{
	}

	/*
		Try to load map; if not found, create a new one.
	*/

	m_savedir = savedir;
	m_map_saving_enabled = false;

	try
	{
		// If directory exists, check contents and load if possible
		if(fs::PathExists(m_savedir))
		{
			// If directory is empty, it is safe to save into it.
			if(fs::GetDirListing(m_savedir).size() == 0)
			{
				dstream<<DTIME<<"Server: Empty save directory is valid."
						<<std::endl;
				m_map_saving_enabled = true;
			}
			else
			{
				try{
					// Load map metadata (seed, chunksize)
					loadMapMeta();
				}
				catch(FileNotGoodException &e){
					dstream<<DTIME<<"WARNING: Could not load map metadata"
							//<<" Disabling chunk-based generator."
							<<std::endl;
					//m_chunksize = 0;
				}

				/*try{
					// Load chunk metadata
					loadChunkMeta();
				}
				catch(FileNotGoodException &e){
					dstream<<DTIME<<"WARNING: Could not load chunk metadata."
							<<" Disabling chunk-based generator."
							<<std::endl;
					m_chunksize = 0;
				}*/

				/*dstream<<DTIME<<"Server: Successfully loaded chunk "
						"metadata and sector (0,0) from "<<savedir<<
						", assuming valid save directory."
						<<std::endl;*/

				dstream<<DTIME<<"INFO: Server: Successfully loaded map "
						<<"and chunk metadata from "<<savedir
						<<", assuming valid save directory."
						<<std::endl;

				m_map_saving_enabled = true;
				// Map loaded, not creating new one
				return;
			}
		}
		// If directory doesn't exist, it is safe to save to it
		else{
			m_map_saving_enabled = true;
		}
	}
	catch(std::exception &e)
	{
		dstream<<DTIME<<"WARNING: Server: Failed to load map from "<<savedir
				<<", exception: "<<e.what()<<std::endl;
		dstream<<"Please remove the map or fix it."<<std::endl;
		dstream<<"WARNING: Map saving will be disabled."<<std::endl;
	}

	dstream<<DTIME<<"INFO: Initializing new map."<<std::endl;

	// Create zero sector
	emergeSector(v2s16(0,0));

	// Initially write whole map
	save(false);
}

ServerMap::~ServerMap()
{
	dstream<<__FUNCTION_NAME<<std::endl;

	try
	{
		if(m_map_saving_enabled)
		{
			// Save only changed parts
			save(true);
			dstream<<DTIME<<"Server: saved map to "<<m_savedir<<std::endl;
		}
		else
		{
			dstream<<DTIME<<"Server: map not saved"<<std::endl;
		}
	}
	catch(std::exception &e)
	{
		dstream<<DTIME<<"Server: Failed to save map to "<<m_savedir
				<<", exception: "<<e.what()<<std::endl;
	}

#if 0
	/*
		Free all MapChunks
	*/
	core::map<v2s16, MapChunk*>::Iterator i = m_chunks.getIterator();
	for(; i.atEnd() == false; i++)
	{
		MapChunk *chunk = i.getNode()->getValue();
		delete chunk;
	}
#endif
}

void ServerMap::initBlockMake(mapgen::BlockMakeData *data, v3s16 blockpos)
{
	bool enable_mapgen_debug_info = g_settings.getBool("enable_mapgen_debug_info");
	if(enable_mapgen_debug_info)
		dstream<<"initBlockMake(): ("<<blockpos.X<<","<<blockpos.Y<<","
				<<blockpos.Z<<")"<<std::endl;
	
	// Do nothing if not inside limits (+-1 because of neighbors)
	if(blockpos_over_limit(blockpos - v3s16(1,1,1)) ||
		blockpos_over_limit(blockpos + v3s16(1,1,1)))
	{
		data->no_op = true;
		return;
	}
	
	data->no_op = false;
	data->seed = m_seed;
	data->blockpos = blockpos;

	/*
		Create the whole area of this and the neighboring blocks
	*/
	{
		//TimeTaker timer("initBlockMake() create area");
		
		for(s16 x=-1; x<=1; x++)
		for(s16 z=-1; z<=1; z++)
		{
			v2s16 sectorpos(blockpos.X+x, blockpos.Z+z);
			// Sector metadata is loaded from disk if not already loaded.
			ServerMapSector *sector = createSector(sectorpos);
			assert(sector);

			for(s16 y=-1; y<=1; y++)
			{
				v3s16 p(blockpos.X+x, blockpos.Y+y, blockpos.Z+z);
				//MapBlock *block = createBlock(p);
				// 1) get from memory, 2) load from disk
				MapBlock *block = emergeBlock(p, false);
				// 3) create a blank one
				if(block == NULL)
				{
					block = createBlock(p);

					/*
						Block gets sunlight if this is true.

						Refer to the map generator heuristics.
					*/
					bool ug = mapgen::block_is_underground(data->seed, p);
					block->setIsUnderground(ug);
				}

				// Lighting will not be valid after make_chunk is called
				block->setLightingExpired(true);
				// Lighting will be calculated
				//block->setLightingExpired(false);
			}
		}
	}
	
	/*
		Now we have a big empty area.

		Make a ManualMapVoxelManipulator that contains this and the
		neighboring blocks
	*/
	
	// The area that contains this block and it's neighbors
	v3s16 bigarea_blocks_min = blockpos - v3s16(1,1,1);
	v3s16 bigarea_blocks_max = blockpos + v3s16(1,1,1);
	
	data->vmanip = new ManualMapVoxelManipulator(this);
	//data->vmanip->setMap(this);

	// Add the area
	{
		//TimeTaker timer("initBlockMake() initialEmerge");
		data->vmanip->initialEmerge(bigarea_blocks_min, bigarea_blocks_max);
	}

	// Data is ready now.
}

MapBlock* ServerMap::finishBlockMake(mapgen::BlockMakeData *data,
		core::map<v3s16, MapBlock*> &changed_blocks)
{
	v3s16 blockpos = data->blockpos;
	/*dstream<<"finishBlockMake(): ("<<blockpos.X<<","<<blockpos.Y<<","
			<<blockpos.Z<<")"<<std::endl;*/

	if(data->no_op)
	{
		//dstream<<"finishBlockMake(): no-op"<<std::endl;
		return NULL;
	}

	bool enable_mapgen_debug_info = g_settings.getBool("enable_mapgen_debug_info");

	/*dstream<<"Resulting vmanip:"<<std::endl;
	data->vmanip.print(dstream);*/
	
	/*
		Blit generated stuff to map
		NOTE: blitBackAll adds nearly everything to changed_blocks
	*/
	{
		// 70ms @cs=8
		//TimeTaker timer("finishBlockMake() blitBackAll");
		data->vmanip->blitBackAll(&changed_blocks);
	}

	if(enable_mapgen_debug_info)
		dstream<<"finishBlockMake: changed_blocks.size()="
				<<changed_blocks.size()<<std::endl;

	/*
		Copy transforming liquid information
	*/
	while(data->transforming_liquid.size() > 0)
	{
		v3s16 p = data->transforming_liquid.pop_front();
		m_transforming_liquid.push_back(p);
	}
	
	/*
		Get central block
	*/
	MapBlock *block = getBlockNoCreateNoEx(data->blockpos);
	assert(block);

	/*
		Set is_underground flag for lighting with sunlight.

		Refer to map generator heuristics.

		NOTE: This is done in initChunkMake
	*/
	//block->setIsUnderground(mapgen::block_is_underground(data->seed, blockpos));


	/*
		Add sunlight to central block.
		This makes in-dark-spawning monsters to not flood the whole thing.
		Do not spread the light, though.
	*/
	/*core::map<v3s16, bool> light_sources;
	bool black_air_left = false;
	block->propagateSunlight(light_sources, true, &black_air_left);*/

	/*
		NOTE: Lighting and object adding shouldn't really be here, but
		lighting is a bit tricky to move properly to makeBlock.
		TODO: Do this the right way anyway, that is, move it to makeBlock.
		      - There needs to be some way for makeBlock to report back if
			    the lighting update is going further down because of the
				new block blocking light
	*/

	/*
		Update lighting
		NOTE: This takes ~60ms, TODO: Investigate why
	*/
	{
		TimeTaker t("finishBlockMake lighting update");

		core::map<v3s16, MapBlock*> lighting_update_blocks;
#if 1
		// Center block
		lighting_update_blocks.insert(block->getPos(), block);

		/*{
			s16 x = 0;
			s16 z = 0;
			v3s16 p = block->getPos()+v3s16(x,1,z);
			lighting_update_blocks[p] = getBlockNoCreateNoEx(p);
		}*/
#endif
#if 0
		// All modified blocks
		// NOTE: Should this be done? If this is not done, then the lighting
		// of the others will be updated in a different place, one by one, i
		// think... or they might not? Well, at least they are left marked as
		// "lighting expired"; it seems that is not handled at all anywhere,
		// so enabling this will slow it down A LOT because otherwise it
		// would not do this at all. This causes the black trees.
		for(core::map<v3s16, MapBlock*>::Iterator
				i = changed_blocks.getIterator();
				i.atEnd() == false; i++)
		{
			lighting_update_blocks.insert(i.getNode()->getKey(),
					i.getNode()->getValue());
		}
		/*// Also force-add all the upmost blocks for proper sunlight
		for(s16 x=-1; x<=1; x++)
		for(s16 z=-1; z<=1; z++)
		{
			v3s16 p = block->getPos()+v3s16(x,1,z);
			lighting_update_blocks[p] = getBlockNoCreateNoEx(p);
		}*/
#endif
		updateLighting(lighting_update_blocks, changed_blocks);
		
		/*
			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=-1; x<=1; x++)
		for(s16 y=-1; y<=1; y++)
		for(s16 z=-1; z<=1; z++)
		{
			v3s16 p = block->getPos()+v3s16(x,y,z);
			getBlockNoCreateNoEx(p)->setLightingExpired(false);
		}

		if(enable_mapgen_debug_info == false)
			t.stop(true); // Hide output
	}

	/*
		Add random objects to block
	*/
	mapgen::add_random_objects(block);

	/*
		Go through changed blocks
	*/
	for(core::map<v3s16, MapBlock*>::Iterator i = changed_blocks.getIterator();
			i.atEnd() == false; i++)
	{
		MapBlock *block = i.getNode()->getValue();
		assert(block);
		/*
			Update day/night difference cache of the MapBlocks
		*/
		block->updateDayNightDiff();
		/*
			Set block as modified
		*/
		block->raiseModified(MOD_STATE_WRITE_NEEDED);
	}

	/*
		Set central block as generated
	*/
	block->setGenerated(true);
	
	/*
		Save changed parts of map
		NOTE: Will be saved later.
	*/
	//save(true);

	/*dstream<<"finishBlockMake() done for ("<<blockpos.X<<","<<blockpos.Y<<","
			<<blockpos.Z<<")"<<std::endl;*/
#if 0
	if(enable_mapgen_debug_info)
	{
		/*
			Analyze resulting blocks
		*/
		for(s16 x=-1; x<=1; x++)
		for(s16 y=-1; y<=1; y++)
		for(s16 z=-1; z<=1; z++)
		{
			v3s16 p = block->getPos()+v3s16(x,y,z);
			MapBlock *block = getBlockNoCreateNoEx(p);
			char spos[20];
			snprintf(spos, 20, "(%2d,%2d,%2d)", x, y, z);
			dstream<<"Generated "<<spos<<": "
					<<analyze_block(block)<<std::endl;
		}
	}
#endif

	return block;
}

ServerMapSector * ServerMap::createSector(v2s16 p2d)
{
	DSTACKF("%s: p2d=(%d,%d)",
			__FUNCTION_NAME,
			p2d.X, p2d.Y);
	
	/*
		Check if it exists already in memory
	*/
	ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
	if(sector != NULL)
		return sector;
	
	/*
		Try to load it from disk (with blocks)
	*/
	//if(loadSectorFull(p2d) == true)

	/*
		Try to load metadata from disk
	*/
	if(loadSectorMeta(p2d) == true)
	{
		ServerMapSector *sector = (ServerMapSector*)getSectorNoGenerateNoEx(p2d);
		if(sector == NULL)
		{
			dstream<<"ServerMap::createSector(): loadSectorFull didn't make a sector"<<std::endl;
			throw InvalidPositionException("");
		}
		return sector;
	}

	/*
		Do not create over-limit
	*/
	if(p2d.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p2d.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p2d.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p2d.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
		throw InvalidPositionException("createSector(): pos. over limit");

	/*
		Generate blank sector
	*/
	
	sector = new ServerMapSector(this, p2d);
	
	// Sector position on map in nodes
	v2s16 nodepos2d = p2d * MAP_BLOCKSIZE;

	/*
		Insert to container
	*/
	m_sectors.insert(p2d, sector);
	
	return sector;
}

/*
	This is a quick-hand function for calling makeBlock().
*/
MapBlock * ServerMap::generateBlock(
		v3s16 p,
		core::map<v3s16, MapBlock*> &modified_blocks
)
{
	DSTACKF("%s: p=(%d,%d,%d)", __FUNCTION_NAME, p.X, p.Y, p.Z);
	
	/*dstream<<"generateBlock(): "
			<<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
			<<std::endl;*/
	
	bool enable_mapgen_debug_info = g_settings.getBool("enable_mapgen_debug_info");

	TimeTaker timer("generateBlock");
	
	//MapBlock *block = original_dummy;
			
	v2s16 p2d(p.X, p.Z);
	v2s16 p2d_nodes = p2d * MAP_BLOCKSIZE;
	
	/*
		Do not generate over-limit
	*/
	if(blockpos_over_limit(p))
	{
		dstream<<__FUNCTION_NAME<<": Block position over limit"<<std::endl;
		throw InvalidPositionException("generateBlock(): pos. over limit");
	}

	/*
		Create block make data
	*/
	mapgen::BlockMakeData data;
	initBlockMake(&data, p);

	/*
		Generate block
	*/
	{
		TimeTaker t("mapgen::make_block()");
		mapgen::make_block(&data);

		if(enable_mapgen_debug_info == false)
			t.stop(true); // Hide output
	}

	/*
		Blit data back on map, update lighting, add mobs and whatever this does
	*/
	finishBlockMake(&data, modified_blocks);

	/*
		Get central block
	*/
	MapBlock *block = getBlockNoCreateNoEx(p);

#if 0
	/*
		Check result
	*/
	if(block)
	{
		bool erroneus_content = false;
		for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
		for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
		for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
		{
			v3s16 p(x0,y0,z0);
			MapNode n = block->getNode(p);
			if(n.getContent() == CONTENT_IGNORE)
			{
				dstream<<"CONTENT_IGNORE at "
						<<"("<<p.X<<","<<p.Y<<","<<p.Z<<")"
						<<std::endl;
				erroneus_content = true;
				assert(0);
			}
		}
		if(erroneus_content)
		{
			assert(0);
		}
	}
#endif

#if 0
	/*
		Generate a completely empty block
	*/
	if(block)
	{
		for(s16 z0=0; z0<MAP_BLOCKSIZE; z0++)
		for(s16 x0=0; x0<MAP_BLOCKSIZE; x0++)
		{
			for(s16 y0=0; y0<MAP_BLOCKSIZE; y0++)
			{
				MapNode n;
				if(y0%2==0)
					n.setContent(CONTENT_AIR);
				else
					n.setContent(CONTENT_STONE);
				block->setNode(v3s16(x0,y0,z0), n);
			}
		}
	}
#endif

	if(enable_mapgen_debug_info == false)
		timer.stop(true); // Hide output

	return block;
}

MapBlock * ServerMap::createBlock(v3s16 p)
{
	DSTACKF("%s: p=(%d,%d,%d)",
			__FUNCTION_NAME, p.X, p.Y, p.Z);
	
	/*
		Do not create over-limit
	*/
	if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
		throw InvalidPositionException("createBlock(): pos. over limit");
	
	v2s16 p2d(p.X, p.Z);
	s16 block_y = p.Y;
	/*
		This will create or load a sector if not found in memory.
		If block exists on disk, it will be loaded.

		NOTE: On old save formats, this will be slow, as it generates
		      lighting on blocks for them.
	*/
	ServerMapSector *sector;
	try{
		sector = (ServerMapSector*)createSector(p2d);
		assert(sector->getId() == MAPSECTOR_SERVER);
	}
	catch(InvalidPositionException &e)
	{
		dstream<<"createBlock: createSector() failed"<<std::endl;
		throw e;
	}
	/*
		NOTE: This should not be done, or at least the exception
		should not be passed on as std::exception, because it
		won't be catched at all.
	*/
	/*catch(std::exception &e)
	{
		dstream<<"createBlock: createSector() failed: "
				<<e.what()<<std::endl;
		throw e;
	}*/

	/*
		Try to get a block from the sector
	*/

	MapBlock *block = sector->getBlockNoCreateNoEx(block_y);
	if(block)
	{
		if(block->isDummy())
			block->unDummify();
		return block;
	}
	// Create blank
	block = sector->createBlankBlock(block_y);
	return block;
}

MapBlock * ServerMap::emergeBlock(v3s16 p, bool allow_generate)
{
	DSTACKF("%s: p=(%d,%d,%d), allow_generate=%d",
			__FUNCTION_NAME,
			p.X, p.Y, p.Z, allow_generate);
	
	{
		MapBlock *block = getBlockNoCreateNoEx(p);
		if(block && block->isDummy() == false)
			return block;
	}

	{
		MapBlock *block = loadBlock(p);
		if(block)
			return block;
	}

	if(allow_generate)
	{
		core::map<v3s16, MapBlock*> modified_blocks;
		MapBlock *block = generateBlock(p, modified_blocks);
		if(block)
		{
			MapEditEvent event;
			event.type = MEET_OTHER;
			event.p = p;

			// Copy modified_blocks to event
			for(core::map<v3s16, MapBlock*>::Iterator
					i = modified_blocks.getIterator();
					i.atEnd()==false; i++)
			{
				event.modified_blocks.insert(i.getNode()->getKey(), false);
			}

			// Queue event
			dispatchEvent(&event);
								
			return block;
		}
	}

	return NULL;
}

#if 0
	/*
		Do not generate over-limit
	*/
	if(p.X < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.X > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Y < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Y > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Z < -MAP_GENERATION_LIMIT / MAP_BLOCKSIZE
	|| p.Z > MAP_GENERATION_LIMIT / MAP_BLOCKSIZE)
		throw InvalidPositionException("emergeBlock(): pos. over limit");
	
	v2s16 p2d(p.X, p.Z);
	s16 block_y = p.Y;
	/*
		This will create or load a sector if not found in memory.
		If block exists on disk, it will be loaded.
	*/
	ServerMapSector *sector;
	try{
		sector = createSector(p2d);
		//sector = emergeSector(p2d, changed_blocks);
	}
	catch(InvalidPositionException &e)
	{
		dstream<<"emergeBlock: createSector() failed: "
				<<e.what()<<std::endl;
		dstream<<"Path to failed sector: "<<getSectorDir(p2d)
				<<std::endl
				<<"You could try to delete it."<<std::endl;
		throw e;
	}
	catch(VersionMismatchException &e)
	{
		dstream<<"emergeBlock: createSector() failed: "
				<<e.what()<<std::endl;
		dstream<<"Path to failed sector: "<<getSectorDir(p2d)
				<<std::endl
				<<"You could try to delete it."<<std::endl;
		throw e;
	}

	/*
		Try to get a block from the sector
	*/

	bool does_not_exist = false;
	bool lighting_expired = false;
	MapBlock *block = sector->getBlockNoCreateNoEx(block_y);
	
	// If not found, try loading from disk
	if(block == NULL)
	{
		block = loadBlock(p);
	}
	
	// Handle result
	if(block == NULL)
	{
		does_not_exist = true;
	}
	else if(block->isDummy() == true)
	{
		does_not_exist = true;
	}
	else if(block->getLightingExpired())
	{
		lighting_expired = true;
	}
	else
	{
		// Valid block
		//dstream<<"emergeBlock(): Returning already valid block"<<std::endl;
		return block;
	}
	
	/*
		If block was not found on disk and not going to generate a
		new one, make sure there is a dummy block in place.
	*/
	if(only_from_disk && (does_not_exist || lighting_expired))
	{
		//dstream<<"emergeBlock(): Was not on disk but not generating"<<std::endl;

		if(block == NULL)
		{
			// Create dummy block
			block = new MapBlock(this, p, true);

			// Add block to sector
			sector->insertBlock(block);
		}
		// Done.
		return block;
	}

	//dstream<<"Not found on disk, generating."<<std::endl;
	// 0ms
	//TimeTaker("emergeBlock() generate");

	//dstream<<"emergeBlock(): Didn't find valid block -> making one"<<std::endl;

	/*
		If the block doesn't exist, generate the block.
	*/
	if(does_not_exist)
	{
		block = generateBlock(p, block, sector, changed_blocks,
				lighting_invalidated_blocks); 
	}

	if(lighting_expired)
	{
		lighting_invalidated_blocks.insert(p, block);
	}

#if 0
	/*
		Initially update sunlight
	*/
	{
		core::map<v3s16, bool> light_sources;
		bool black_air_left = false;
		bool bottom_invalid =
				block->propagateSunlight(light_sources, true,
				&black_air_left);

		// If sunlight didn't reach everywhere and part of block is
		// above ground, lighting has to be properly updated
		//if(black_air_left && some_part_underground)
		if(black_air_left)
		{
			lighting_invalidated_blocks[block->getPos()] = block;
		}

		if(bottom_invalid)
		{
			lighting_invalidated_blocks[block->getPos()] = block;
		}
	}
#endif
	
	return block;
}
#endif

s16 ServerMap::findGroundLevel(v2s16 p2d)
{
#if 0
	/*
		Uh, just do something random...
	*/
	// Find existing map from top to down
	s16 max=63;
	s16 min=-64;
	v3s16 p(p2d.X, max, p2d.Y);
	for(; p.Y>min; p.Y--)
	{
		MapNode n = getNodeNoEx(p);
		if(n.getContent() != CONTENT_IGNORE)
			break;
	}
	if(p.Y == min)
		goto plan_b;
	// If this node is not air, go to plan b
	if(getNodeNoEx(p).getContent() != CONTENT_AIR)
		goto plan_b;
	// Search existing walkable and return it
	for(; p.Y>min; p.Y--)
	{
		MapNode n = getNodeNoEx(p);
		if(content_walkable(n.d) && n.getContent() != CONTENT_IGNORE)
			return p.Y;
	}

	// Move to plan b
plan_b:
#endif

	/*
		Determine from map generator noise functions
	*/
	
	s16 level = mapgen::find_ground_level_from_noise(m_seed, p2d, 1);
	return level;

	//double level = base_rock_level_2d(m_seed, p2d) + AVERAGE_MUD_AMOUNT;
	//return (s16)level;
}

void ServerMap::createDirs(std::string path)
{
	if(fs::CreateAllDirs(path) == false)
	{
		m_dout<<DTIME<<"ServerMap: Failed to create directory "
				<<"\""<<path<<"\""<<std::endl;
		throw BaseException("ServerMap failed to create directory");
	}
}

std::string ServerMap::getSectorDir(v2s16 pos, int layout)
{
	char cc[9];
	switch(layout)
	{
		case 1:
			snprintf(cc, 9, "%.4x%.4x",
				(unsigned int)pos.X&0xffff,
				(unsigned int)pos.Y&0xffff);

			return m_savedir + "/sectors/" + cc;
		case 2:
			snprintf(cc, 9, "%.3x/%.3x",
				(unsigned int)pos.X&0xfff,
				(unsigned int)pos.Y&0xfff);

			return m_savedir + "/sectors2/" + cc;
		default:
			assert(false);
	}
}

v2s16 ServerMap::getSectorPos(std::string dirname)
{
	unsigned int x, y;
	int r;
	size_t spos = dirname.rfind('/') + 1;
	assert(spos != std::string::npos);
	if(dirname.size() - spos == 8)
	{
		// Old layout
		r = sscanf(dirname.substr(spos).c_str(), "%4x%4x", &x, &y);
	}
	else if(dirname.size() - spos == 3)
	{
		// New layout
		r = sscanf(dirname.substr(spos-4).c_str(), "%3x/%3x", &x, &y);
		// Sign-extend the 12 bit values up to 16 bits...
		if(x&0x800) x|=0xF000;
		if(y&0x800) y|=0xF000;
	}
	else
	{
		assert(false);
	}
	assert(r == 2);
	v2s16 pos((s16)x, (s16)y);
	return pos;
}

v3s16 ServerMap::getBlockPos(std::string sectordir, std::string blockfile)
{
	v2s16 p2d = getSectorPos(sectordir);

	if(blockfile.size() != 4){
		throw InvalidFilenameException("Invalid block filename");
	}
	unsigned int y;
	int r = sscanf(blockfile.c_str(), "%4x", &y);
	if(r != 1)
		throw InvalidFilenameException("Invalid block filename");
	return v3s16(p2d.X, y, p2d.Y);
}

std::string ServerMap::getBlockFilename(v3s16 p)
{
	char cc[5];
	snprintf(cc, 5, "%.4x", (unsigned int)p.Y&0xffff);
	return cc;
}

void ServerMap::save(bool only_changed)
{
	DSTACK(__FUNCTION_NAME);
	if(m_map_saving_enabled == false)
	{
		dstream<<DTIME<<"WARNING: Not saving map, saving disabled."<<std::endl;
		return;
	}
	
	if(only_changed == false)
		dstream<<DTIME<<"ServerMap: Saving whole map, this can take time."
				<<std::endl;
	
	if(only_changed == false || m_map_metadata_changed)
	{
		saveMapMeta();
	}

	u32 sector_meta_count = 0;
	u32 block_count = 0;
	u32 block_count_all = 0; // Number of blocks in memory
	
	core::map<v2s16, MapSector*>::Iterator i = m_sectors.getIterator();
	for(; i.atEnd() == false; i++)
	{
		ServerMapSector *sector = (ServerMapSector*)i.getNode()->getValue();
		assert(sector->getId() == MAPSECTOR_SERVER);
	
		if(sector->differs_from_disk || only_changed == false)
		{
			saveSectorMeta(sector);
			sector_meta_count++;
		}
		core::list<MapBlock*> blocks;
		sector->getBlocks(blocks);
		core::list<MapBlock*>::Iterator j;
		for(j=blocks.begin(); j!=blocks.end(); j++)
		{
			MapBlock *block = *j;
			
			block_count_all++;

			if(block->getModified() >= MOD_STATE_WRITE_NEEDED 
					|| only_changed == false)
			{
				saveBlock(block);
				block_count++;

				/*dstream<<"ServerMap: Written block ("
						<<block->getPos().X<<","
						<<block->getPos().Y<<","
						<<block->getPos().Z<<")"
						<<std::endl;*/
			}
		}
	}

	/*
		Only print if something happened or saved whole map
	*/
	if(only_changed == false || sector_meta_count != 0
			|| block_count != 0)
	{
		dstream<<DTIME<<"ServerMap: Written: "
				<<sector_meta_count<<" sector metadata files, "
				<<block_count<<" block files"
				<<", "<<block_count_all<<" blocks in memory."
				<<std::endl;
	}
}

void ServerMap::saveMapMeta()
{
	DSTACK(__FUNCTION_NAME);
	
	dstream<<"INFO: ServerMap::saveMapMeta(): "
			<<"seed="<<m_seed
			<<std::endl;

	createDirs(m_savedir);
	
	std::string fullpath = m_savedir + "/map_meta.txt";
	std::ofstream os(fullpath.c_str(), std::ios_base::binary);
	if(os.good() == false)
	{
		dstream<<"ERROR: ServerMap::saveMapMeta(): "
				<<"could not open"<<fullpath<<std::endl;
		throw FileNotGoodException("Cannot open chunk metadata");
	}
	
	Settings params;
	params.setU64("seed", m_seed);

	params.writeLines(os);

	os<<"[end_of_params]\n";
	
	m_map_metadata_changed = false;
}

void ServerMap::loadMapMeta()
{
	DSTACK(__FUNCTION_NAME);
	
	dstream<<"INFO: ServerMap::loadMapMeta(): Loading map metadata"
			<<std::endl;

	std::string fullpath = m_savedir + "/map_meta.txt";
	std::ifstream is(fullpath.c_str(), std::ios_base::binary);
	if(is.good() == false)
	{
		dstream<<"ERROR: ServerMap::loadMapMeta(): "