src/main.cpp

/*
Minetest
Copyright (C) 2013 sapier, sapier at gmx dot net
Copyright (C) 2016 est31, <MTest31@outlook.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.
*/

/******************************************************************************/
/* Includes                                                                   */
/******************************************************************************/

#include "pathfinder.h"
#include "map.h"
#include "nodedef.h"

//#define PATHFINDER_DEBUG
//#define PATHFINDER_CALC_TIME

#ifdef PATHFINDER_DEBUG
	#include <string>
#endif
#ifdef PATHFINDER_DEBUG
	#include <iomanip>
#endif
#ifdef PATHFINDER_CALC_TIME
	#include <sys/time.h>
#endif

/******************************************************************************/
/* Typedefs and macros                                                        */
/******************************************************************************/

#define LVL "(" << level << ")" <<

#ifdef PATHFINDER_DEBUG
#define DEBUG_OUT(a)     std::cout << a
#define INFO_TARGET      std::cout
#define VERBOSE_TARGET   std::cout
#define ERROR_TARGET     std::cout
#else
#define DEBUG_OUT(a)     while(0)
#define INFO_TARGET      infostream << "Pathfinder: "
#define VERBOSE_TARGET   verbosestream << "Pathfinder: "
#define ERROR_TARGET     warningstream << "Pathfinder: "
#endif

#define PATHFINDER_MAX_WAYPOINTS 700

/******************************************************************************/
/* Class definitions                                                          */
/******************************************************************************/


/** representation of cost in specific direction */
class PathCost {
public:

	/** default constructor */
	PathCost() = default;

	/** copy constructor */
	PathCost(const PathCost &b);

	/** assignment operator */
	PathCost &operator= (const PathCost &b);

	bool valid = false;              /**< movement is possible         */
	int  value = 0;                  /**< cost of movement             */
	int  y_change = 0;               /**< change of y position of movement */
	bool updated = false;            /**< this cost has ben calculated */

};


/** representation of a mapnode to be used for pathfinding */
class PathGridnode {

public:
	/** default constructor */
	PathGridnode() = default;

	/** copy constructor */
	PathGridnode(const PathGridnode &b);

	/**
	 * assignment operator
	 * @param b node to copy
	 */
	PathGridnode &operator= (const PathGridnode &b);

	/**
	 * read cost in a specific direction
	 * @param dir direction of cost to fetch
	 */
	PathCost getCost(v3s16 dir);

	/**
	 * set cost value for movement
	 * @param dir direction to set cost for
	 * @cost cost to set
	 */
	void      setCost(v3s16 dir, const PathCost &cost);

	bool      valid = false;               /**< node is on surface                    */
	bool      target = false;              /**< node is target position               */
	bool      source = false;              /**< node is stating position              */
	int       totalcost = -1;              /**< cost to move here from starting point */
	int       estimated_cost = -1;         /**< totalcost + heuristic cost to end     */
	v3s16     sourcedir;                   /**< origin of movement for current cost   */
	v3s16     pos;                         /**< real position of node                 */
	PathCost directions[4];                /**< cost in different directions          */
	bool      is_closed = false;           /**< for A* search: if true, is in closed list */
	bool      is_open = false;             /**< for A* search: if true, is in open list */

	/* debug values */
	bool      is_element = false;          /**< node is element of path detected      */
	char      type = 'u';                  /**< Type of pathfinding node.
	                                        * u = unknown
	                                        * i = invalid
	                                        * s = surface (walkable node)
	                                        * - = non-walkable node (e.g. air) above surface
	                                        * g = other non-walkable node
                                                */
};

class Pathfinder;
class PathfinderCompareHeuristic;

/** Abstract class to manage the map data */
class GridNodeContainer {
public:
	virtual PathGridnode &access(v3s16 p)=0;
	virtual ~GridNodeContainer() = default;

protected:
	Pathfinder *m_pathf;

	void initNode(v3s16 ipos, PathGridnode *p_node);
};

class ArrayGridNodeContainer : public GridNodeContainer {
public:
	virtual ~ArrayGridNodeContainer() = default;

	ArrayGridNodeContainer(Pathfinder *pathf, v3s16 dimensions);
	virtual PathGridnode &access(v3s16 p);
private:
	v3s16 m_dimensions;

	int m_x_stride;
	int m_y_stride;
	std::vector<PathGridnode> m_nodes_array;
};

class MapGridNodeContainer : public GridNodeContainer {
public:
	virtual ~MapGridNodeContainer() = default;

	MapGridNodeContainer(Pathfinder *pathf);
	virtual PathGridnode &access(v3s16 p);
private:
	std::map<v3s16, PathGridnode> m_nodes;
};

/** class doing pathfinding */
class Pathfinder {

public:
	Pathfinder() = delete;
	Pathfinder(Map *map, const NodeDefManager *ndef) : m_map(map), m_ndef(ndef) {}

	~Pathfinder();

	/**
	 * path evaluation function
	 * @param env environment to look for path
	 * @param source origin of path
	 * @param destination end position of path
	 * @param searchdistance maximum number of nodes to look in each direction
	 * @param max_jump maximum number of blocks a path may jump up
	 * @param max_drop maximum number of blocks a path may drop
	 * @param algo Algorithm to use for finding a path
	 */
	std::vector<v3s16> getPath(v3s16 source,
			v3s16 destination,
			unsigned int searchdistance,
			unsigned int max_jump,
			unsigned int max_drop,
			PathAlgorithm algo);

private:
	/* helper functions */

	/**
	 * transform index pos to mappos
	 * @param ipos a index position
	 * @return map position
	 */
	v3s16          getRealPos(v3s16 ipos);

	/**
	 * transform mappos to index pos
	 * @param pos a real pos
	 * @return index position
	 */
	v3s16          getIndexPos(v3s16 pos);

	/**
	 * get gridnode at a specific index position
	 * @param ipos index position
	 * @return gridnode for index
	 */
	PathGridnode &getIndexElement(v3s16 ipos);

	/**
	 * Get gridnode at a specific index position
	 * @return gridnode for index
	 */
	PathGridnode &getIdxElem(s16 x, s16 y, s16 z);

	/**
	 * invert a 3D position (change sign of coordinates)
	 * @param pos 3D position
	 * @return pos *-1
	 */
	v3s16          invert(v3s16 pos);

	/**
	 * check if a index is within current search area
	 * @param index position to validate
	 * @return true/false
	 */
	bool           isValidIndex(v3s16 index);


	/* algorithm functions */

	/**
	 * calculate 2D Manhattan distance to target
	 * @param pos position to calc distance
	 * @return integer distance
	 */
	int           getXZManhattanDist(v3s16 pos);

	/**
	 * calculate cost of movement
	 * @param pos real world position to start movement
	 * @param dir direction to move to
	 * @return cost information
	 */
	PathCost     calcCost(v3s16 pos, v3s16 dir);

	/**
	 * recursive update whole search areas total cost information
	 * @param ipos position to check next
	 * @param srcdir positionc checked last time
	 * @param total_cost cost of moving to ipos
	 * @param level current recursion depth
	 * @return true/false path to destination has been found
	 */
	bool          updateAllCosts(v3s16 ipos, v3s16 srcdir, int current_cost, int level);

	/**
	 * try to find a path to destination using a heuristic function
	 * to estimate distance to target (A* search algorithm)
	 * @param isource start position (index pos)
	 * @param idestination end position (index pos)
	 * @return true/false path to destination has been found
	 */
	bool          updateCostHeuristic(v3s16 isource, v3s16 idestination);

	/**
	 * build a vector containing all nodes from destination to source;
	 * to be called after the node costs have been processed
	 * @param path vector to add nodes to
	 * @param ipos initial pos to check (index pos)
	 * @return true/false path has been fully built
	 */
	bool          buildPath(std::vector<v3s16> &path, v3s16 ipos);

	/**
	 * go downwards from a position until some barrier
	 * is hit.
	 * @param pos position from which to go downwards
	 * @param max_down maximum distance to go downwards
	 * @return new position after movement; if too far down,
	 * pos is returned
	 */
	v3s16         walkDownwards(v3s16 pos, unsigned int max_down);

	/* variables */
	int m_max_index_x = 0;            /**< max index of search area in x direction  */
	int m_max_index_y = 0;            /**< max index of search area in y direction  */
	int m_max_index_z = 0;            /**< max index of search area in z direction  */


	int m_searchdistance = 0;         /**< max distance to search in each direction */
	int m_maxdrop = 0;                /**< maximum number of blocks a path may drop */
	int m_maxjump = 0;                /**< maximum number of blocks a path may jump */
	int m_min_target_distance = 0;    /**< current smalest path to target           */

	bool m_prefetch = true;              /**< prefetch cost data                       */

	v3s16 m_start;                /**< source position                          */
	v3s16 m_destination;          /**< destination position                     */

	core::aabbox3d<s16> m_limits; /**< position limits in real map coordinates  */

	/** contains all map data already collected and analyzed.
		Access it via the getIndexElement/getIdxElem methods. */
	friend class GridNodeContainer;
	GridNodeContainer *m_nodes_container = nullptr;

	Map *m_map = nullptr;

	const NodeDefManager *m_ndef = nullptr;

	friend class PathfinderCompareHeuristic;

#ifdef PATHFINDER_DEBUG

	/**
	 * print collected cost information
	 */
	void printCost();

	/**
	 * print collected cost information in a specific direction
	 * @param dir direction to print
	 */
	void printCost(PathDirections dir);

	/**
	 * print type of node as evaluated
	 */
	void printType();

	/**
	 * print pathlenght for all nodes in search area
	 */
	void printPathLen();

	/**
	 * print a path
	 * @param path path to show
	 */
	void printPath(std::vector<v3s16> path);

	/**
	 * print y direction for all movements
	 */
	void printYdir();

	/**
	 * print y direction for moving in a specific direction
	 * @param dir direction to show data
	 */
	void printYdir(PathDirections dir);

	/**
	 * helper function to translate a direction to speaking text
	 * @param dir direction to translate
	 * @return textual name of direction
	 */
	std::string dirToName(PathDirections dir);
#endif
};

/** Helper class for the open list priority queue in the A* pathfinder
 *  to sort the pathfinder nodes by cost.
 */
class PathfinderCompareHeuristic
{
	private:
		Pathfinder *myPathfinder;
	public:
		PathfinderCompareHeuristic(Pathfinder *pf)
		{
			myPathfinder = pf;
		}
		bool operator() (v3s16 pos1, v3s16 pos2) {
			v3s16 ipos1 = myPathfinder->getIndexPos(pos1);
			v3s16 ipos2 = myPathfinder->getIndexPos(pos2);
			PathGridnode &g_pos1 = myPathfinder->getIndexElement(ipos1);
			PathGridnode &g_pos2 = myPathfinder->getIndexElement(ipos2);
			if (!g_pos1.valid)
				return false;
			if (!g_pos2.valid)
				return false;
			return g_pos1.estimated_cost > g_pos2.estimated_cost;
		}
};

/******************************************************************************/
/* implementation                                                             */
/******************************************************************************/

std::vector<v3s16> get_path(Map* map, const NodeDefManager *ndef,
		v3s16 source,
		v3s16 destination,
		unsigned int searchdistance,
		unsigned int max_jump,
		unsigned int max_drop,
		PathAlgorithm algo)
{
	return Pathfinder(map, ndef).getPath(source, destination,
				searchdistance, max_jump, max_drop, algo);
}

/******************************************************************************/
PathCost::PathCost(const PathCost &b)
{
	valid     = b.valid;
	y_change  = b.y_change;
	value     = b.value;
	updated   = b.updated;
}

/******************************************************************************/
PathCost &PathCost::operator= (const PathCost &b)
{
	valid     = b.valid;
	y_change  = b.y_change;
	value     = b.value;
	updated   = b.updated;

	return *this;
}

/******************************************************************************/
PathGridnode::PathGridnode(const PathGridnode &b)
:	valid(b.valid),
	target(b.target),
	source(b.source),
	totalcost(b.totalcost),
	sourcedir(b.sourcedir),
	pos(b.pos),
	is_element(b.is_element),
	type(b.type)
{

	directions[DIR_XP] = b.directions[DIR_XP];
	directions[DIR_XM] = b.directions[DIR_XM];
	directions[DIR_ZP] = b.directions[DIR_ZP];
	directions[DIR_ZM] = b.directions[DIR_ZM];
}

/******************************************************************************/
PathGridnode &PathGridnode::operator= (const PathGridnode &b)
{
	valid      = b.valid;
	target     = b.target;
	source     = b.source;
	is_element = b.is_element;
	totalcost  = b.totalcost;
	sourcedir  = b.sourcedir;
	pos        = b.pos;
	type       = b.type;

	directions[DIR_XP] = b.directions[DIR_XP];
	directions[DIR_XM] = b.directions[DIR_XM];
	directions[DIR_ZP] = b.directions[DIR_ZP];
	directions[DIR_ZM] = b.directions[DIR_ZM];

	return *this;
}

/******************************************************************************/
PathCost PathGridnode::getCost(v3s16 dir)
{
	if (dir.X > 0) {
		return directions[DIR_XP];
	}
	if (dir.X < 0) {
		return directions[DIR_XM];
	}
	if (dir.Z > 0) {
		return directions[DIR_ZP];
	}
	if (dir.Z < 0) {
		return directions[DIR_ZM];
	}
	PathCost retval;
	return retval;
}

/******************************************************************************/
void PathGridnode::setCost(v3s16 dir, const PathCost &cost)
{
	if (dir.X > 0) {
		directions[DIR_XP] = cost;
	}
	if (dir.X < 0) {
		directions[DIR_XM] = cost;
	}
	if (dir.Z > 0) {
		directions[DIR_ZP] = cost;
	}
	if (dir.Z < 0) {
		directions[DIR_ZM] = cost;
	}
}

void GridNodeContainer::initNode(v3s16 ipos, PathGridnode *p_node)
{
	const NodeDefManager *ndef = m_pathf->m_ndef;
	PathGridnode &elem = *p_node;

	v3s16 realpos = m_pathf->getRealPos(ipos);

	MapNode current = m_pathf->m_map->getNode(realpos);
	MapNode below   = m_pathf->m_map->getNode(realpos + v3s16(0, -1, 0));


	if ((current.param0 == CONTENT_IGNORE) ||
			(below.param0 == CONTENT_IGNORE)) {
		DEBUG_OUT("Pathfinder: " << PP(realpos) <<
			" current or below is invalid element" << std::endl);
		if (current.param0 == CONTENT_IGNORE) {
			elem.type = 'i';
			DEBUG_OUT(PP(ipos) << ": " << 'i' << std::endl);
		}
		return;
	}

	//don't add anything if it isn't an air node
	if (ndef->get(current).walkable || !ndef->get(below).walkable) {
			DEBUG_OUT("Pathfinder: " << PP(realpos)
				<< " not on surface" << std::endl);
			if (ndef->get(current).walkable) {
				elem.type = 's';
				DEBUG_OUT(PP(ipos) << ": " << 's' << std::endl);
			} else {
				elem.type = '-';
				DEBUG_OUT(PP(ipos) << ": " << '-' << std::endl);
			}
			return;
	}

	elem.valid = true;
	elem.pos   = realpos;
	elem.type  = 'g';
	DEBUG_OUT(PP(ipos) << ": " << 'a' << std::endl);

	if (m_pathf->m_prefetch) {
		elem.directions[DIR_XP] = m_pathf->calcCost(realpos, v3s16( 1, 0, 0));
		elem.directions[DIR_XM] = m_pathf->calcCost(realpos, v3s16(-1, 0, 0));
		elem.directions[DIR_ZP] = m_pathf->calcCost(realpos, v3s16( 0, 0, 1));
		elem.directions[DIR_ZM] = m_pathf->calcCost(realpos, v3s16( 0, 0,-1));
	}
}

ArrayGridNodeContainer::ArrayGridNodeContainer(Pathfinder *pathf, v3s16 dimensions) :
	m_x_stride(dimensions.Y * dimensions.Z),
	m_y_stride(dimensions.Z)
{
	m_pathf = pathf;

	m_nodes_array.resize(dimensions.X * dimensions.Y * dimensions.Z);
	INFO_TARGET << "Pathfinder ArrayGridNodeContainer constructor." << std::endl;
	for (int x = 0; x < dimensions.X; x++) {
		for (int y = 0; y < dimensions.Y; y++) {
			for (int z= 0; z < dimensions.Z; z++) {
				v3s16 ipos(x, y, z);
				initNode(ipos, &access(ipos));
			}
		}
	}
}

PathGridnode &ArrayGridNodeContainer::access(v3s16 p)
{
	return m_nodes_array[p.X * m_x_stride + p.Y * m_y_stride + p.Z];
}

MapGridNodeContainer::MapGridNodeContainer(Pathfinder *pathf)
{
	m_pathf = pathf;
}

PathGridnode &MapGridNodeContainer::access(v3s16 p)
{
	std::map<v3s16, PathGridnode>::iterator it = m_nodes.find(p);
	if (it != m_nodes.end()) {
		return it->second;
	}
	PathGridnode &n = m_nodes[p];
	initNode(p, &n);
	return n;
}


/******************************************************************************/
std::vector<v3s16> Pathfinder::getPath(v3s16 source,
							v3s16 destination,
							unsigned int searchdistance,
							unsigned int max_jump,
							unsigned int max_drop,
							PathAlgorithm algo)
{
#ifdef PATHFINDER_CALC_TIME
	timespec ts;
	clock_gettime(CLOCK_REALTIME, &ts);
#endif
	std::vector<v3s16> retval;

	//initialization
	m_searchdistance = searchdistance;
	m_maxjump = max_jump;
	m_maxdrop = max_drop;
	m_start       = source;
	m_destination = destination;
	m_min_target_distance = -1;
	m_prefetch = true;

	if (algo == PA_PLAIN_NP) {
		m_prefetch = false;
	}

	//calculate boundaries within we're allowed to search
	int min_x = MYMIN(source.X, destination.X);
	int max_x = MYMAX(source.X, destination.X);

	int min_y = MYMIN(source.Y, destination.Y);
	int max_y = MYMAX(source.Y, destination.Y);

	int min_z = MYMIN(source.Z, destination.Z);
	int max_z = MYMAX(source.Z, destination.Z);

	m_limits.MinEdge.X = min_x - searchdistance;
	m_limits.MinEdge.Y = min_y - searchdistance;
	m_limits.MinEdge.Z = min_z - searchdistance;

	m_limits.MaxEdge.X = max_x + searchdistance;
	m_limits.MaxEdge.Y = max_y + searchdistance;
	m_limits.MaxEdge.Z = max_z + searchdistance;

	v3s16 diff = m_limits.MaxEdge - m_limits.MinEdge;

	m_max_index_x = diff.X;
	m_max_index_y = diff.Y;
	m_max_index_z = diff.Z;

	delete m_nodes_container;
	if (diff.getLength() > 5) {
		m_nodes_container = new MapGridNodeContainer(this);
	} else {
		m_nodes_container = new ArrayGridNodeContainer(this, diff);
	}
#ifdef PATHFINDER_DEBUG
	printType();
	printCost();
	printYdir();
#endif

	//fail if source or destination is walkable
	MapNode node_at_pos = m_map->getNode(destination);
	if (m_ndef->get(node_at_pos).walkable) {
		VERBOSE_TARGET << "Destination is walkable. " <<
				"Pos: " << PP(destination) << std::endl;
		return retval;
	}
	node_at_pos = m_map->getNode(source);
	if (m_ndef->get(node_at_pos).walkable) {
		VERBOSE_TARGET << "Source is walkable. " <<
				"Pos: " << PP(source) << std::endl;
		return retval;
	}

	//If source pos is hovering above air, drop
	//to the first walkable node (up to m_maxdrop).
	//All algorithms expect the source pos to be *directly* above
	//a walkable node.
	v3s16 true_source = v3s16(source);
	source = walkDownwards(source, m_maxdrop);

	//If destination pos is hovering above air, go downwards
	//to the first walkable node (up to m_maxjump).
	//This means a hovering destination pos could be reached
	//by a final upwards jump.
	v3s16 true_destination = v3s16(destination);
	destination = walkDownwards(destination, m_maxjump);

	//validate and mark start and end pos

	v3s16 StartIndex  = getIndexPos(source);
	v3s16 EndIndex    = getIndexPos(destination);

	PathGridnode &startpos = getIndexElement(StartIndex);
	PathGridnode &endpos   = getIndexElement(EndIndex);

	if (!startpos.valid) {
		VERBOSE_TARGET << "Invalid startpos " <<
				"Index: " << PP(StartIndex) <<
				"Realpos: " << PP(getRealPos(StartIndex)) << std::endl;
		return retval;
	}
	if (!endpos.valid) {
		VERBOSE_TARGET << "Invalid stoppos " <<
				"Index: " << PP(EndIndex) <<
				"Realpos: " << PP(getRealPos(EndIndex)) << std::endl;
		return retval;
	}

	endpos.target      = true;
	startpos.source    = true;
	startpos.totalcost = 0;

	bool update_cost_retval = false;

	//calculate node costs
	switch (algo) {
		case PA_DIJKSTRA:
			update_cost_retval = updateAllCosts(StartIndex, v3s16(0, 0, 0), 0, 0);
			break;
		case PA_PLAIN_NP:
		case PA_PLAIN:
			update_cost_retval = updateCostHeuristic(StartIndex, EndIndex);
			break;
		default:
			ERROR_TARGET << "Missing PathAlgorithm" << std::endl;
			break;
	}

	if (update_cost_retval) {

#ifdef PATHFINDER_DEBUG
		std::cout << "Path to target found!" << std::endl;
		printPathLen();
#endif

		//find path
		std::vector<v3s16> index_path;
		buildPath(index_path, EndIndex);
		//Now we have a path of index positions,
		//and it's in reverse.
		//The "true" start or end position might be missing
		//since those have been given special treatment.

#ifdef PATHFINDER_DEBUG
		std::cout << "Index path:" << std::endl;
		printPath(index_path);
#endif
		//from here we'll make the final changes to the path
		std::vector<v3s16> full_path;

		//calculate required size
		int full_path_size = index_path.size();
		if (source != true_source) {
			full_path_size++;
		}
		if (destination != true_destination) {
			full_path_size++;
		}
		full_path.reserve(full_path_size);

		//manually add true_source to start of path, if needed
		if (source != true_source) {
			full_path.push_back(true_source);
		}
		//convert all index positions to "normal" positions and insert
		//them into full_path in reverse
		std::vector<v3s16>::reverse_iterator rit = index_path.rbegin();
		for (; rit != index_path.rend(); ++rit) {
			full_path.push_back(getIndexElement(*rit).pos);
		}
		//manually add true_destination to end of path, if needed
		if (destination != true_destination) {
			full_path.push_back(true_destination);
		}

		//Done! We now have a complete path of normal positions.


#ifdef PATHFINDER_DEBUG
		std::cout << "Full path:" << std::endl;
		printPath(full_path);
#endif
#ifdef PATHFINDER_CALC_TIME
		timespec ts2;
		clock_gettime(CLOCK_REALTIME, &ts2);

		int ms = (ts2.tv_nsec - ts.tv_nsec)/(1000*1000);
		int us = ((ts2.tv_nsec - ts.tv_nsec) - (ms*1000*1000))/1000;
		int ns = ((ts2.tv_nsec - ts.tv_nsec) - ( (ms*1000*1000) + (us*1000)));


		std::cout << "Calculating path took: " << (ts2.tv_sec - ts.tv_sec) <<
				"s " << ms << "ms " << us << "us " << ns << "ns " << std::endl;
#endif
		return full_path;
	}
	else {
#ifdef PATHFINDER_DEBUG
		printPathLen();
#endif
		INFO_TARGET << "No path found" << std::endl;
	}


	//return
	return retval;
}

Pathfinder::~Pathfinder()
{
	delete m_nodes_container;
}
/******************************************************************************/
v3s16 Pathfinder::getRealPos(v3s16 ipos)
{
	return m_limits.MinEdge + ipos;
}

/******************************************************************************/
PathCost Pathfinder::calcCost(v3s16 pos, v3s16 dir)
{
	PathCost retval;

	retval.updated = true;

	v3s16 pos2 = pos + dir;

	//check limits
	if (!m_limits.isPointInside(pos2)) {
		DEBUG_OUT("Pathfinder: " << PP(pos2) <<
				" no cost -> out of limits" << std::endl);
		return retval;
	}

	MapNode node_at_pos2 = m_map->getNode(pos2);

	//did we get information about node?
	if (node_at_pos2.param0 == CONTENT_IGNORE ) {
			VERBOSE_TARGET << "Pathfinder: (1) area at pos: "
					<< PP(pos2) << " not loaded";
			return retval;
	}

	if (!m_ndef->get(node_at_pos2).walkable) {
		MapNode node_below_pos2 =
			m_map->getNode(pos2 + v3s16(0, -1, 0));

		//did we get information about node?
		if (node_below_pos2.param0 == CONTENT_IGNORE ) {
				VERBOSE_TARGET << "Pathfinder: (2) area at pos: "
					<< PP((pos2 + v3s16(0, -1, 0))) << " not loaded";
				return retval;
		}

		//test if the same-height neighbor is suitable
		if (m_ndef->get(node_below_pos2).walkable) {
			//SUCCESS!
			retval.valid = true;
			retval.value = 1;
			retval.y_change = 0;
			DEBUG_OUT("Pathfinder: "<< PP(pos)
					<< " cost same height found" << std::endl);
		}
		else {
			//test if we can fall a couple of nodes (m_maxdrop)
			v3s16 testpos = pos2 + v3s16(0, -1, 0);
			MapNode node_at_pos = m_map->getNode(testpos);

			while ((node_at_pos.param0 != CONTENT_IGNORE) &&
					(!m_ndef->get(node_at_pos).walkable) &&
					(testpos.Y > m_limits.MinEdge.Y)) {
				testpos += v3s16(0, -1, 0);
				node_at_pos = m_map->getNode(testpos);
			}

			//did we find surface?
			if ((testpos.Y >= m_limits.MinEdge.Y) &&
					(node_at_pos.param0 != CONTENT_IGNORE) &&
					(m_ndef->get(node_at_pos).walkable)) {
				if ((pos2.Y - testpos.Y - 1) <= m_maxdrop) {
					//SUCCESS!
					retval.valid = true;
					retval.value = 2;
					//difference of y-pos +1 (target node is ABOVE solid node)
					retval.y_change = ((testpos.Y - pos2.Y) +1);
					DEBUG_OUT("Pathfinder cost below height found" << std::endl);
				}
				else {
					INFO_TARGET << "Pathfinder:"
							" distance to surface below too big: "
							<< (testpos.Y - pos2.Y) << " max: " << m_maxdrop
							<< std::endl;
				}
			}
			else {
				DEBUG_OUT("Pathfinder: no surface below found" << std::endl);
			}
		}
	}
	else {
		//test if we can jump upwards (m_maxjump)

		v3s16 targetpos = pos2; // position for jump target
		v3s16 jumppos = pos; // position for checking if jumping space is free
		MapNode node_target = m_map->getNode(targetpos);
		MapNode node_jump = m_map->getNode(jumppos);
		bool headbanger = false; // true if anything blocks jumppath

		while ((node_target.param0 != CONTENT_IGNORE) &&
				(m_ndef->get(node_target).walkable) &&
				(targetpos.Y < m_limits.MaxEdge.Y)) {
			//if the jump would hit any solid node, discard
			if ((node_jump.param0 == CONTENT_IGNORE) ||
					(m_ndef->get(node_jump).walkable)) {
					headbanger = true;
				break;
			}
			targetpos += v3s16(0, 1, 0);
			jumppos   += v3s16(0, 1, 0);
			node_target = m_map->getNode(targetpos);
			node_jump   = m_map->getNode(jumppos);

		}
		//check headbanger one last time
		if ((node_jump.param0 == CONTENT_IGNORE) ||
			(m_ndef->get(node_jump).walkable)) {
			headbanger = true;
		}

		//did we find surface without banging our head?
		if ((!headbanger) && (targetpos.Y <= m_limits.MaxEdge.Y) &&
				(!m_ndef->get(node_target).walkable)) {

			if (targetpos.Y - pos2.Y <= m_maxjump) {
				//SUCCESS!
				retval.valid = true;
				retval.value = 2;
				retval.y_change = (targetpos.Y - pos2.Y);
				DEBUG_OUT("Pathfinder cost above found" << std::endl);
			}
			else {
				DEBUG_OUT("Pathfinder: distance to surface above too big: "
						<< (targetpos.Y - pos2.Y) << " max: " << m_maxjump
						<< std::endl);
			}
		}
		else {
			DEBUG_OUT("Pathfinder: no surface above found" << std::endl);
		}
	}
	return retval;
}

/******************************************************************************/
v3s16 Pathfinder::getIndexPos(v3s16 pos)
{
	return pos - m_limits.MinEdge;
}

/******************************************************************************/
PathGridnode &Pathfinder::getIndexElement(v3s16 ipos)
{
	return m_nodes_container->access(ipos);
}

/******************************************************************************/
inline PathGridnode &Pathfinder::getIdxElem(s16 x, s16 y, s16 z)
{
	return m_nodes_container->access(v3s16(x,y,z));
}

/******************************************************************************/
bool Pathfinder::isValidIndex(v3s16 index)
{
	if (	(index.X < m_max_index_x) &&
			(index.Y < m_max_index_y) &&
			(index.Z < m_max_index_z) &&
			(index.X >= 0) &&
			(index.Y >= 0) &&
			(index.Z >= 0))
		return true;

	return false;
}

/******************************************************************************/
v3s16 Pathfinder::invert(v3s16 pos)
{
	v3s16 retval = pos;

	retval.X *=-1;
	retval.Y *=-1;
	retval.Z *=-1;

	return retval;
}

/******************************************************************************/
bool Pathfinder::updateAllCosts(v3s16 ipos,
								v3s16 srcdir,
								int current_cost,
								int level)
{
	PathGridnode &g_pos = getIndexElement(ipos);
	g_pos.totalcost = current_cost;
	g_pos.sourcedir = srcdir;

	level ++;

	//check if target has been found
	if (g_pos.target) {
		m_min_target_distance = current_cost;
		DEBUG_OUT(LVL " Pathfinder: target found!" << std::endl);
		return true;
	}

	bool retval = false;

	// the 4 cardinal directions
	const static v3s16 directions[4] = {
		v3s16(1,0, 0),
		v3s16(-1,0, 0),
		v3s16(0,0, 1),
		v3s16(0,0,-1)
	};

	for (v3s16 direction : directions) {
		if (direction != srcdir) {
			PathCost cost = g_pos.getCost(direction);

			if (cost.valid) {
				direction.Y = cost.y_change;

				v3s16 ipos2 = ipos + direction;

				if (!isValidIndex(ipos2)) {
					DEBUG_OUT(LVL " Pathfinder: " << PP(ipos2) <<
						" out of range, max=" << PP(m_limits.MaxEdge) << std::endl);
					continue;
				}

				PathGridnode &g_pos2 = getIndexElement(ipos2);

				if (!g_pos2.valid) {
					VERBOSE_TARGET << LVL "Pathfinder: no data for new position: "
												<< PP(ipos2) << std::endl;
					continue;
				}

				assert(cost.value > 0);

				int new_cost = current_cost + cost.value;

				// check if there already is a smaller path
				if ((m_min_target_distance > 0) &&
						(m_min_target_distance < new_cost)) {
					return false;
				}

				if ((g_pos2.totalcost < 0) ||
						(g_pos2.totalcost > new_cost)) {
					DEBUG_OUT(LVL "Pathfinder: updating path at: "<<
							PP(ipos2) << " from: " << g_pos2.totalcost << " to "<<
							new_cost << std::endl);
					if (updateAllCosts(ipos2, invert(direction),
											new_cost, level)) {
						retval = true;
						}
					}
				else {
					DEBUG_OUT(LVL "Pathfinder:"
							" already found shorter path to: "
							<< PP(ipos2) << std::endl);
				}
			}
			else {
				DEBUG_OUT(LVL "Pathfinder:"
						" not moving to invalid direction: "
						<< PP(directions[i]) << std::endl);
			}
		}
	}
	return retval;
}

/******************************************************************************/
int Pathfinder::getXZManhattanDist(v3s16 pos)
{
	int min_x = MYMIN(pos.X, m_destination.X);
	int max_x = MYMAX(pos.X, m_destination.X);
	int min_z = MYMIN(pos.Z, m_destination.Z);
	int max_z = MYMAX(pos.Z, m_destination.Z);

	return (max_x - min_x) + (max_z - min_z);
}


/******************************************************************************/
bool Pathfinder::updateCostHeuristic(v3s16 isource, v3s16 idestination)
{
	// A* search algorithm.

	// The open list contains the pathfinder nodes that still need to be
	// checked. The priority queue sorts the pathfinder nodes by
	// estimated cost, with lowest cost on the top.
	std::priority_queue<v3s16, std::vector<v3s16>, PathfinderCompareHeuristic>
			openList(PathfinderCompareHeuristic(this));

	v3s16 source = getRealPos(isource);
	v3s16 destination = getRealPos(idestination);

	// initial position
	openList.push(source);

	// the 4 cardinal directions
	const static v3s16 directions[4] = {
		v3s16(1,0, 0),
		v3s16(-1,0, 0),
		v3s16(0,0, 1),
		v3s16(0,0,-1)
	};

	v3s16 current_pos;
	PathGridnode& s_pos = getIndexElement(isource);
	s_pos.source = true;
	s_pos.totalcost = 0;

	// estimated cost from start to finish
	int cur_manhattan = getXZManhattanDist(destination);
	s_pos.estimated_cost = cur_manhattan;

	while (!openList.empty()) {
		// Pick node with lowest total cost estimate.
		// The "cheapest" node is always on top.
		current_pos = openList.top();
		openList.pop();
		v3s16 ipos = getIndexPos(current_pos);

		// check if node is inside searchdistance and valid
		if (!isValidIndex(ipos)) {
			DEBUG_OUT(LVL " Pathfinder: " << PP(current_pos) <<
				" out of search distance, max=" << PP(m_limits.MaxEdge) << std::endl);
			continue;
		}

		PathGridnode& g_pos = getIndexElement(ipos);
		g_pos.is_closed = true;
		g_pos.is_open = false;
		if (!g_pos.valid) {
			continue;
		}

		if (current_pos == destination) {
			// destination found, terminate
			g_pos.target = true;
			return true;
		}

		// for this node, check the 4 cardinal directions
		for (v3s16 direction_flat : directions) {
			int current_totalcost = g_pos.totalcost;

			// get cost from current node to currently checked direction
			PathCost cost = g_pos.getCost(direction_flat);
			if (!cost.updated) {
				cost = calcCost(current_pos, direction_flat);
				g_pos.setCost(direction_flat, cost);
			}
			// update Y component of direction if neighbor requires jump or fall
			v3s16 direction_3d = v3s16(direction_flat);
			direction_3d.Y = cost.y_change;

			// get position of true neighbor
			v3s16 neighbor = current_pos + direction_3d;
			v3s16 ineighbor = getIndexPos(neighbor);
			PathGridnode &n_pos = getIndexElement(ineighbor);

			if (cost.valid && !n_pos.is_closed && !n_pos.is_open) {
				// heuristic function; estimate cost from neighbor to destination
				cur_manhattan = getXZManhattanDist(neighbor);

				// add neighbor to open list
				n_pos.sourcedir = invert(direction_3d);
				n_pos.totalcost = current_totalcost + cost.value;
				n_pos.estimated_cost = current_totalcost + cost.value + cur_manhattan;
				n_pos.is_open = true;
				openList.push(neighbor);
			}
		}
	}
	// no path found; all possible nodes within searchdistance have been exhausted
	return false;
}

/******************************************************************************/
bool Pathfinder::buildPath(std::vector<v3s16> &path, v3s16 ipos)
{
	// The cost calculation should have set a source direction for all relevant nodes.
	// To build the path, we go backwards from the destination until we reach the start.
	for(u32 waypoints = 1; waypoints++; ) {
		if (waypoints > PATHFINDER_MAX_WAYPOINTS) {
			ERROR_TARGET << "Pathfinder: buildPath: path is too long (too many waypoints), aborting" << std::endl;
			return false;
		}
		// Insert node into path
		PathGridnode &g_pos = getIndexElement(ipos);
		if (!g_pos.valid) {
			ERROR_TARGET << "Pathfinder: buildPath: invalid next pos detected, aborting" << std::endl;
			return false;
		}

		g_pos.is_element = true;
		path.push_back(ipos);
		if (g_pos.source)
			// start node found, terminate
			return true;

		// go to the node from which the pathfinder came
		ipos += g_pos.sourcedir;
	}

	ERROR_TARGET << "Pathfinder: buildPath: no source node found" << std::endl;
	return false;
}

/******************************************************************************/
v3s16 Pathfinder::walkDownwards(v3s16 pos, unsigned int max_down) {
	if (max_down == 0)
		return pos;
	v3s16 testpos = v3s16(pos);
	MapNode node_at_pos = m_map->getNode(testpos);
	unsigned int down = 0;
	while ((node_at_pos.param0 != CONTENT_IGNORE) &&
			(!m_ndef->get(node_at_pos).walkable) &&
			(testpos.Y > m_limits.MinEdge.Y) &&
			(down <= max_down)) {
		testpos += v3s16(0, -1, 0);
		down++;
		node_at_pos = m_map->getNode(testpos);
	}
	//did we find surface?
	if ((testpos.Y >= m_limits.MinEdge.Y) &&
			(node_at_pos.param0 != CONTENT_IGNORE) &&
			(m_ndef->get(node_at_pos).walkable)) {
		if (down == 0) {
			pos = testpos;
		} else if ((down - 1) <= max_down) {
			//difference of y-pos +1 (target node is ABOVE solid node)
			testpos += v3s16(0, 1, 0);
			pos = testpos;
		}
		else {
			VERBOSE_TARGET << "Pos too far above ground: " <<
				"Index: " << PP(getIndexPos(pos)) <<
				"Realpos: " << PP(getRealPos(getIndexPos(pos))) << std::endl;
		}
	} else {
		DEBUG_OUT("Pathfinder: no surface found below pos" << std::endl);
	}
	return pos;
}

#ifdef PATHFINDER_DEBUG

/******************************************************************************/
void Pathfinder::printCost()
{
	printCost(DIR_XP);
	printCost(DIR_XM);
	printCost(DIR_ZP);
	printCost(DIR_ZM);
}

/******************************************************************************/
void Pathfinder::printYdir()
{
	printYdir(DIR_XP);
	printYdir(DIR_XM);
	printYdir(DIR_ZP);
	printYdir(DIR_ZM);
}

/******************************************************************************/
void Pathfinder::printCost(PathDirections dir)
{
	std::cout << "Cost in direction: " << dirToName(dir) << std::endl;
	std::cout << std::setfill('-') << std::setw(80) << "-" << std::endl;
	std::cout << std::setfill(' ');
	for (int y = 0; y < m_max_index_y; y++) {

		std::cout << "Level: " << y << std::endl;

		std::cout << std::setw(4) << " " << "  ";
		for (int x = 0; x < m_max_index_x; x++) {
			std::cout << std::setw(4) << x;
		}
		std::cout << std::endl;

		for (int z = 0; z < m_max_index_z; z++) {
			std::cout << std::setw(4) << z <<": ";
			for (int x = 0; x < m_max_index_x; x++) {
				if (getIdxElem(x, y, z).directions[dir].valid)
					std::cout << std::setw(4)
						<< getIdxElem(x, y, z).directions[dir].value;
				else
					std::cout << std::setw(4) << "-";
				}
			std::cout << std::endl;
		}
		std::cout << std::endl;
	}
}

/******************************************************************************/
void Pathfinder::printYdir(PathDirections dir)
{
	std::cout << "Height difference in direction: " << dirToName(dir) << std::endl;
	std::cout << std::setfill('-') << std::setw(80) << "-" << std::endl;
	std::cout << std::setfill(' ');
	for (int y = 0; y < m_max_index_y; y++) {

		std::cout << "Level: " << y << std::endl;

		std::cout << std::setw(4) << " " << "  ";
		for (int x = 0; x < m_max_index_x; x++) {
			std::cout << std::setw(4) << x;
		}
		std::cout << std::endl;

		for (int z = 0; z < m_max_index_z; z++) {
			std::cout << std::setw(4) << z <<": ";
			for (int x = 0; x < m_max_index_x; x++) {
				if (getIdxElem(x, y, z).directions[dir].valid)
					std::cout << std::setw(4)
						<< getIdxElem(x, y, z).directions[dir].y_change;
				else
					std::cout << std::setw(4) << "-";
				}
			std::cout << std::endl;
		}
		std::cout << std::endl;
	}
}

/******************************************************************************/
void Pathfinder::printType()
{
	std::cout << "Type of node:" << std::endl;
	std::cout << std::setfill('-') << std::setw(80) << "-" << std::endl;
	std::cout << std::setfill(' ');
	for (int y = 0; y < m_max_index_y; y++) {

		std::cout << "Level: " << y << std::endl;

		std::cout << std::setw(3) << " " << "  ";
		for (int x = 0; x < m_max_index_x; x++) {
			std::cout << std::setw(3) << x;
		}
		std::cout << std::endl;

		for (int z = 0; z < m_max_index_z; z++) {
			std::cout << std::setw(3) << z <<": ";
			for (int x = 0; x < m_max_index_x; x++) {
				char toshow = getIdxElem(x, y, z).type;
				std::cout << std::setw(3) << toshow;
			}
			std::cout << std::endl;
		}
		std::cout << std::endl;
	}
	std::cout << std::endl;
}

/******************************************************************************/
void Pathfinder::printPathLen()
{
	std::cout << "Pathlen:" << std::endl;
		std::cout << std::setfill('-') << std::setw(80) << "-" << std::endl;
		std::cout << std::setfill(' ');
		for (int y = 0; y < m_max_index_y; y++) {

			std::cout << "Level: " << y << std::endl;

			std::cout << std::setw(3) << " " << "  ";
			for (int x = 0; x < m_max_index_x; x++) {
				std::cout << std::setw(3) << x;
			}
			std::cout << std::endl;

			for (int z = 0; z < m_max_index_z; z++) {
				std::cout << std::setw(3) << z <<": ";
				for (int x = 0; x < m_max_index_x; x++) {
					std::cout << std::setw(3) << getIdxElem(x, y, z).totalcost;
				}
				std::cout << std::endl;
			}
			std::cout << std::endl;
		}
		std::cout << std::endl;
}

/******************************************************************************/
std::string Pathfinder::dirToName(PathDirections dir)
{
	switch (dir) {
	case DIR_XP:
		return "XP";
		break;
	case DIR_XM:
		return "XM";
		break;
	case DIR_ZP:
		return "ZP";
		break;
	case DIR_ZM:
		return "ZM";
		break;
	default:
		return "UKN";
	}
}

/******************************************************************************/
void Pathfinder::printPath(std::vector<v3s16> path)
{
	unsigned int current = 0;
	for (std::vector<v3s16>::iterator i = path.begin();
			i != path.end(); ++i) {
		std::cout << std::setw(3) << current << ":" << PP((*i)) << std::endl;
		current++;
	}
}

#endif
	Commit message (Collapse)	Author	Age
*	Cleanup ClientLauncher structure (#10160)	SmallJoker	2020-07-14
\| \| \|	Remove duplicated variables and unify the startup data into a new (inherited) struct.
*	Server class code cleanups (#9769)	Loïc Blot	2020-05-07
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Server::overrideDayNightRatio doesn't require to return bool There is no sense to sending null player, the caller should send a valid object * Server::init: make private & cleanup This function is always called before start() and loads some variables which can be loaded in constructor directly. Make it private and call it directly in start * Split Server inventory responsibility to a dedicated object This splits permit to found various historical issues: * duplicate lookups on player connection * sending inventory to non related player when a player connects * non friendly lookups on detached inventories ownership This reduce the detached inventory complexity and also increased the lookup performance in a quite interesting way for servers with thousands of inventories.
*	Rename "subgame" to "game" in 2 error messages (#9680)	Wuzzy	2020-04-17
\|
*	Add an option to disable unittest build, & disable them on Docker build (#9677)	Loïc Blot	2020-04-16
\|
*	Android: add Android Studio support, completely redone java part (#9066)	Maksim	2020-04-15
\|
*	Overall improvements to log messages (#9598)	sfan5	2020-04-08
\| \| \| \|	Hide some unnecessarily verbose ones behind --trace or disable them entirely. Remove duplicate ones. Improve their contents in some places.
*	Fix build issue due to conflicting s64 type definitions (#9064)	Dmitry Marakasov	2019-10-23
\| \| \|	See comment in irrlichttypes.h and https://sourceforge.net/p/irrlicht/bugs/433/
*	Move Quicktune code to util/ (#8871)	ANAND	2019-09-29
\|
*	Move debug.txt after it grows too big (#8904)	HybridDog	2019-09-07
\| \| \|	Before opening the file for writing, its file size is tested. If it exceeds 50 MB, it is moved to debut.txt.1, otherwise the log is appended to the old messages. An old debut.txt.1 is removed if it already exists.
*	Fix handling of --color and --worldlist command line arguments	Markus Mattes	2019-06-21
\| \| \| \| \| \| \| \|	They verify the provided value and error if a wrong value got provided command line description for color was differnt on win32 but code did not handle any differenc extended the command line description for world and worldname that it is clear that they only start a local game if used with --go Fixes #7875
*	Fix --color command line parameter ignorance (#7173)	HybridDog	2019-03-05
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Fix color command line parameter ignorance * coloured log: Support detecting the tty on windows * Print an error message when setting something invalid as color mode instead of silently using mode never * Revert "coloured log: Support detecting the tty on windows" This reverts commit 4c9fc6366487ac0e6799e181796ca594797bb6f8. It didn't work for travis and belongs to a separate PR * Allow adjusting the log color with an environment variable If --color is not passed to minetest, is used to decide on the log colorization. Minetest settings can not be used instead of an environment variable because logs may appear before loading them. * fix empty if body
*	Add command line option to load password from file (#7832)	Kevin Abrams	2018-12-18
\|
*	Move client-specific files to 'src/client' (#7902)	Quentin Bazin	2018-11-28
\| \| \| \| \|	Update Android.mk Remove 'src/client' from include_directories
*	Save debug.txt to build dir for RUN_IN_PLACE build (#7615)	pauloue	2018-08-15
\|
*	Replace auth.txt with SQLite auth database (#7279)	Ben Deutsch	2018-08-05
\| \| \| \|	* Replace auth.txt with SQLite auth database
*	Server: move shutdown parts to a specific shutdown state object (#7437)	Loïc Blot	2018-06-13
\| \| \| \|	* Server: move shutdown parts to a specific shutdown state object
*	Fix missing warningstream (or similar problem) (#7034)	you	2018-03-04
\| \| \| \| \| \| \|	Use the --color command line parameter instead of a setting for coloured logs This fixes the missing warningstream bug, g_settings->get mustn't be used there. Also, the decision about en- or disabling log colours fits better to the command line parameters than minetest settings.
*	Allow for getting world name and path separately on the command line (#6555)	Brian	2018-03-04
\| \| \| \| \| \| \| \| \|	Change to --worldlist instead of --world list. Gets rid of --worldpath parameter added as part of this pull request, instead moving the listing function to a command --worldlist that accepts either name, path, or both and prints out the corresponding information.
*	Move files to subdirectories (#6599)	Vitaliy	2017-11-08
\| \| \| \|	* Move files around
*	Server: affect bind_addr on constructor instead of start() (#6474)	Loïc Blot	2017-09-28
\| \| \|	bind_addr is already ready when using constructor as we read is.IPv6 from it, instead pass the whole address
*	main.cpp: server-only builds should not include client headers	Loic Blot	2017-09-07
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*	Add build date to minetest --version and increase readability (#6331)	you	2017-09-03
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*	Remove DSTACK support (#6346)	Loïc Blot	2017-08-30
\| \| \|	Debugstacks is not useful, we don't really use it, the DebugStack is not pertinent, gdb and lldb are better if we really want to debug.
*	Network cleanup (#6302)	Loïc Blot	2017-08-24
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Cleanup network headers * Move peerhandler to a specific header to reduce compilation times * Move socket.cpp/h to network folder * More work * Network code cleanups * Move socket.{cpp,h} to network folder * Move Address object to network/address.{cpp,h} * Move network exceptions to network/networkexceptions.h * Client: use unique_ptr for Connection * Server/ClientIface: use shared_ptr for Connection * Format fixes * Remove socket.cpp socket.h from clang-format whitelist * Also fix NetworkPacket code style & make it under clang-format
*	Modernize source code: last part (#6285)	Loïc Blot	2017-08-20
\| \| \| \| \| \| \| \| \| \| \|	* Modernize source code: last par * Use empty when needed * Use emplace_back instead of push_back when needed * For range-based loops * Initializers fixes * constructors, destructors default * c++ C stl includes
*	Optimize headers (part 2) (#6272)	Loïc Blot	2017-08-18
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Optimize headers (part 2) * less debug.h in headers * less remoteplayer.h for everybody * Cleanup (part 2) * camera.h: mesh.h * mapgen.h: mapnode.h * serverenvironment.h: mapblock.h * nodedef.h: shader.h
*	Modernize various files (src/m*) (#6267)	Loïc Blot	2017-08-18
\| \| \| \| \| \| \| \| \| \| \| \|	* Modernize various files (src/m) range-based for loops * code style * C++ headers instead of C headers * Default operators * empty function Thanks to clang-tidy
*	Cleanup various headers to reduce compilation times (#6255)	Loïc Blot	2017-08-16
\| \| \| \|	* Cleanup various headers to reduce compilation times
*	Cpp11 initializers 2 (#5999)	Loïc Blot	2017-06-17
\| \| \| \| \| \| \| \| \| \|	* C++11 patchset 10: continue cleanup on constructors * Drop obsolete bool MainMenuData::enable_public (setting is called with cURL in server loop) * More classes cleanup * More classes cleanup + change NULL tests to boolean tests
*	Clean up getTime helpers	ShadowNinja	2017-04-28
\| \| \| \| \| \|	This increases size of the getTime return values to 64 bits. It also removes the TimeGetter classes since the getTime functions are now very precise.
*	Player data to Database (#5475)	Loïc Blot	2017-04-23
\| \| \| \| \| \| \| \| \| \| \| \|	* Player data to Database Add player data into databases (SQLite3 & PG only) PostgreSQL & SQLite: better POO Design for databases Add --migrate-players argument to server + deprecation warning * Remove players directory if empty
*	Windows: Skip cmd for release builds (#5416)	adrido	2017-04-07
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*	Server list cleanup	ShadowNinja	2017-03-18
\| \| \| \|	This removes the hacky server_dedicated pseudo-setting.
*	Windows: dont link to libraries that are already linked by cmake	adrido	2016-10-25
\| \| \| \|	This solves the problem whith building where build fails if the libaries have different names.
*	DB::loadBlock copy removal & DB backend cleanup	Loic Blot	2016-05-17
\| \| \| \| \|	* Remove the copy from db::loadBlock by using a pointer to the destination * cleanup db backend, the child backend doesn't have to set their functions as virtual
*	Fix typo in the info printed by --version	Craig Robbins	2016-05-11
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*	Add platform name to --version information	Craig Robbins	2016-05-11
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*	Add seperate cache path	ShadowNinja	2015-12-07
\| \| \| \| \|	This is set to the XDG cache path where possible. It's set to the app's cache path on Android.
*	Abort compile when attempting to build client with Irrlicht 1.8.2	kwolekr	2015-11-08
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*	Add server side ncurses terminal	est31	2015-11-06
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	This adds a chat console the server owner can use for administration or to talk with players. It runs in its own thread, which makes the user interface immune to the server's lag, behaving just like a client, except timeout. As it uses the same console code as the f10 console, things like nick completion or a scroll buffer basically come for free. The terminal itself is written in a general way so that adding a client version later on is just about implementing an interface. Fatal errors are printed after the console exists and the ncurses terminal buffer gets cleaned up with endwin(), so that the error still remains visible. The server owner can chose their username their entered text will have in chat and where players can send PMs to. Once the username is secured with a password to prevent anybody to take over the server, the owner can execute admin tasks over the console. This change includes a contribution by @kahrl who has improved ncurses library detection.
*	Print direct command line responses to standard output instead of using the ↵	Perttu Ahola	2015-11-02
\| \| \| \| \| \|	log system Using logging for these just makes them bloated and hard to read and overally just not neat at all.
*	Fix server crashing on Lua errors	ShadowNinja	2015-10-31
\| \| \| \| \| \| \| \|	Previously, the server called FATAL_ERROR when a Lua error occured. This caused a (mostly useless) core dump. The server now simply throws an exception, which is caught and printed before exiting with a non-zero return value. This also fixes a number of instances where errors were logged multiple times.
*	Remove some abort() calls	est31	2015-10-26
\| \| \| \|	abort() doesn't benefit from the high level abstractions from FATAL_ERROR.
*	Fix compilation under MSVC and remove unnecessary conditional function prototype	kwolekr	2015-10-24
\| \| \| \|	Thanks to SmallJoker for pointing this out.
*	init_log_streams: check if log_filename is empty.	Jun Zhang	2015-10-19
\| \| \| \|	Fixes #3262.
*	Always use errorstream for DEBUG_EXCEPTION_HANDLER	ShadowNinja	2015-10-14
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*	Refactor logging	ShadowNinja	2015-10-14
\| \| \| \| \| \| \| \| \|	- Add warning log level - Change debug_log_level setting to enumeration string - Map Irrlicht log events to MT log events - Encapsulate log_* functions and global variables into a class, Logger - Unify dstream with standard logging mechanism - Unify core.debug() with standard core.log() script API
*	Use CUSTOM_LOCALEDIR if specified	ShadowNinja	2015-09-06
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*	Change i++ to ++i	David Jones	2015-08-25
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*	Clean up threading	ShadowNinja	2015-08-23
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Rename everything. * Strip J prefix. * Change UpperCamelCase functions to lowerCamelCase. * Remove global (!) semaphore count mutex on OSX. * Remove semaphore count getter (unused, unsafe, depended on internal API functions on Windows, and used a hack on OSX). * Add `Atomic<type>`. * Make `Thread` handle thread names. * Add support for C++11 multi-threading. * Combine pthread and win32 sources. * Remove `ThreadStarted` (unused, unneeded). * Move some includes from the headers to the sources. * Move all of `Event` into its header (allows inlining with no new includes). * Make `Event` use `Semaphore` (except on Windows). * Move some porting functions into `Thread`. * Integrate logging with `Thread`. * Add threading test.