map.cpp

/*
Minetest
Copyright (C) 2010-2013 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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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 "filesys.h"
#include "voxel.h"
#include "porting.h"
#include "serialization.h"
#include "nodemetadata.h"
#include "settings.h"
#include "log.h"
#include "profiler.h"
#include "nodedef.h"
#include "gamedef.h"
#include "util/directiontables.h"
#include "util/mathconstants.h"
#include "rollback_interface.h"
#include "environment.h"
#include "emerge.h"
#include "mapgen_v6.h"
#include "biome.h"
#include "config.h"
#include "server.h"
#include "database.h"
#include "database-dummy.h"
#include "database-sqlite3.h"
#if USE_LEVELDB
#include "database-leveldb.h"
#endif

#define PP(x) "("<<(x).X<<","<<(x).Y<<","<<(x).Z<<")"

/*
	SQLite format specification:
	- Initially only replaces sectors/ and sectors2/

	If map.sqlite does not exist in the save dir
	or the block was not found in the database
	the map will try to load from sectors folder.
	In either case, map.sqlite will be created
	and all future saves will save there.

	Structure of map.sqlite:
	Tables:
		blocks
			(PK) INT pos
			BLOB data
*/

/*
	Map
*/

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

Map::~Map()
{
	/*
		Free all MapSectors
	*/
	for(std::map<v2s16, MapSector*>::iterator i = m_sectors.begin();
		i != m_sectors.end(); ++i)
	{
		delete i->second;
	}
}

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

void Map::removeEventReceiver(MapEventReceiver *event_receiver)
{
	m_event_receivers.erase(event_receiver);
}

void Map::dispatchEvent(MapEditEvent *event)
{
	for(std::set<MapEventReceiver*>::iterator
			i = m_event_receivers.begin();
			i != m_event_receivers.end(); ++i)
	{
		(*i)->onMapEditEvent(event);
	}
}

MapSector * Map::getSectorNoGenerateNoExNoLock(v2s16 p)
{
	if(m_sector_cache != NULL && p == m_sector_cache_p){
		MapSector * sector = m_sector_cache;
		return sector;
	}

	std::map<v2s16, MapSector*>::iterator n = m_sectors.find(p);

	if(n == m_sectors.end())
		return NULL;

	MapSector *sector = n->second;

	// 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)
{