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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file pathfind.h The oldest pathfinder that's supported. */
#ifndef PATHFIND_H
#define PATHFIND_H
#include "direction_type.h"
#include "station_base.h"
#include "waypoint_base.h"
enum {
STR_FACTOR = 2,
DIAG_FACTOR = 3
};
//#define PF_BENCH // perform simple benchmarks on the train pathfinder (not
//supported on all archs)
struct TrackPathFinder;
typedef bool TPFEnumProc(TileIndex tile, void *data, Trackdir trackdir, uint length);
typedef void TPFAfterProc(TrackPathFinder *tpf);
typedef bool NTPEnumProc(TileIndex tile, void *data, int track, uint length);
#define PATHFIND_GET_LINK_OFFS(tpf, link) ((byte*)(link) - (byte*)tpf->links)
#define PATHFIND_GET_LINK_PTR(tpf, link_offs) (TrackPathFinderLink*)((byte*)tpf->links + (link_offs))
/* y7 y6 y5 y4 y3 y2 y1 y0 x7 x6 x5 x4 x3 x2 x1 x0
* y7 y6 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0 0 0
* 0 0 y7 y6 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0
* 0 0 0 0 y5 y4 y3 y2 y1 y0 x4 x3 x2 x1 x0 0
*/
#define PATHFIND_HASH_TILE(tile) (TileX(tile) & 0x1F) + ((TileY(tile) & 0x1F) << 5)
struct TrackPathFinderLink {
TileIndex tile;
uint16 flags;
uint16 next;
};
struct RememberData {
uint16 cur_length;
byte depth;
Track last_choosen_track;
};
struct TrackPathFinder {
int num_links_left;
TrackPathFinderLink *new_link;
TPFEnumProc *enum_proc;
void *userdata;
RememberData rd;
TrackdirByte the_dir;
TransportType tracktype;
uint sub_type;
bool disable_tile_hash;
uint16 hash_head[0x400];
TileIndex hash_tile[0x400]; ///< stores the link index when multi link.
TrackPathFinderLink links[0x400]; ///< hopefully, this is enough.
};
/** Some flags to modify the behaviour of original pathfinder */
enum PathfindFlags {
PATHFIND_FLAGS_NONE = 0,
PATHFIND_FLAGS_SHIP_MODE = 0x0800, ///< pathfinder with some optimizations for ships, but does not work for other types.
PATHFIND_FLAGS_DISABLE_TILE_HASH = 0x1000, ///< do not check for searching in circles
};
DECLARE_ENUM_AS_BIT_SET(PathfindFlags)
void FollowTrack(TileIndex tile, PathfindFlags flags, TransportType tt, uint sub_type, DiagDirection direction, TPFEnumProc *enum_proc, TPFAfterProc *after_proc, void *data);
void NewTrainPathfind(TileIndex tile, TileIndex dest, RailTypes railtypes, DiagDirection direction, NTPEnumProc *enum_proc, void *data);
/**
* Calculates the tile of given station that is closest to a given tile
* for this we assume the station is a rectangle,
* as defined by its tile are (st->train_station)
* @param station The station to calculate the distance to
* @param tile The tile from where to calculate the distance
* @return The closest station tile to the given tile.
*/
static inline TileIndex CalcClosestStationTile(StationID station, TileIndex tile)
{
const BaseStation *st = BaseStation::Get(station);
/* If the rail station is (temporarily) not present, use the station sign to drive near the station */
if (st->train_station.tile == INVALID_TILE) return st->xy;
uint minx = TileX(st->train_station.tile); // topmost corner of station
uint miny = TileY(st->train_station.tile);
uint maxx = minx + st->train_station.w - 1; // lowermost corner of station
uint maxy = miny + st->train_station.h - 1;
/* we are going the aim for the x coordinate of the closest corner
* but if we are between those coordinates, we will aim for our own x coordinate */
uint x = ClampU(TileX(tile), minx, maxx);
/* same for y coordinate, see above comment */
uint y = ClampU(TileY(tile), miny, maxy);
/* return the tile of our target coordinates */
return TileXY(x, y);
}
#endif /* PATHFIND_H */
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