tron@2186: /* $Id$ */
tron@2186: 
matthijs@1247: #ifndef NPF_H
matthijs@1247: #define NPF_H
matthijs@1247: 
Darkvater@1891: #include "openttd.h"
matthijs@1247: #include "aystar.h"
matthijs@1247: #include "vehicle.h"
matthijs@1942: #include "tile.h"
tron@2159: #include "variables.h"
matthijs@1247: 
matthijs@1247: //mowing grass
matthijs@1661: enum {
matthijs@1661: 	NPF_HASH_BITS = 12, /* The size of the hash used in pathfinding. Just changing this value should be sufficient to change the hash size. Should be an even value. */
matthijs@1661: 	/* Do no change below values */
matthijs@1661: 	NPF_HASH_SIZE = 1 << NPF_HASH_BITS,
matthijs@1661: 	NPF_HASH_HALFBITS = NPF_HASH_BITS / 2,
matthijs@1661: 	NPF_HASH_HALFMASK = (1 << NPF_HASH_HALFBITS) - 1
matthijs@1661: };
matthijs@1247: 
matthijs@1777: enum {
matthijs@1777: 	/** This penalty is the equivalent of "inifite", which means that paths that
matthijs@1777: 	 * get this penalty will be chosen, but only if there is no other route
matthijs@1777: 	 * without it. Be careful with not applying this penalty to often, or the
matthijs@1777: 	 * total path cost might overflow..
matthijs@1777: 	 * For now, this is just a Very Big Penalty, we might actually implement
matthijs@1777: 	 * this in a nicer way :-)
matthijs@1777: 	 */
matthijs@1777: 	NPF_INFINITE_PENALTY = 1000 * NPF_TILE_LENGTH
matthijs@1777: };
matthijs@1777: 
matthijs@1247: typedef struct NPFFindStationOrTileData { /* Meant to be stored in AyStar.targetdata */
matthijs@1247: 	TileIndex dest_coords; /* An indication of where the station is, for heuristic purposes, or the target tile */
matthijs@1247: 	int station_index; /* station index we're heading for, or -1 when we're heading for a tile */
matthijs@1247: } NPFFindStationOrTileData;
matthijs@1247: 
matthijs@1247: enum { /* Indices into AyStar.userdata[] */
matthijs@1330: 	NPF_TYPE = 0, /* Contains a TransportTypes value */
matthijs@1330: 	NPF_OWNER, /* Contains an Owner value */
matthijs@2006: 	NPF_RAILTYPE, /* Contains the RailType value of the engine when NPF_TYPE == TRANSPORT_RAIL. Unused otherwise. */
matthijs@1247: };
matthijs@1247: 
matthijs@1247: enum { /* Indices into AyStarNode.userdata[] */
matthijs@1247: 	NPF_TRACKDIR_CHOICE = 0, /* The trackdir chosen to get here */
matthijs@1247: 	NPF_NODE_FLAGS,
matthijs@1247: };
hackykid@2008: 
matthijs@1459: typedef enum { /* Flags for AyStarNode.userdata[NPF_NODE_FLAGS]. Use NPFGetBit() and NPFGetBit() to use them. */
matthijs@1459: 	NPF_FLAG_SEEN_SIGNAL, /* Used to mark that a signal was seen on the way, for rail only */
matthijs@1459: 	NPF_FLAG_REVERSE, /* Used to mark that this node was reached from the second start node, if applicable */
matthijs@1459: 	NPF_FLAG_LAST_SIGNAL_RED, /* Used to mark that the last signal on this path was red */
matthijs@1459: } NPFNodeFlag;
matthijs@1247: 
matthijs@1247: typedef struct NPFFoundTargetData { /* Meant to be stored in AyStar.userpath */
matthijs@1247: 	uint best_bird_dist; /* The best heuristic found. Is 0 if the target was found */
matthijs@1247: 	uint best_path_dist; /* The shortest path. Is (uint)-1 if no path is found */
matthijs@1942: 	Trackdir best_trackdir; /* The trackdir that leads to the shortest path/closest birds dist */
matthijs@1247: 	AyStarNode node; /* The node within the target the search led us to */
matthijs@1247: } NPFFoundTargetData;
matthijs@1247: 
matthijs@1247: /* These functions below are _not_ re-entrant, in favor of speed! */
matthijs@1247: 
matthijs@1247: /* Will search from the given tile and direction, for a route to the given
matthijs@1247:  * station for the given transport type. See the declaration of
matthijs@1247:  * NPFFoundTargetData above for the meaning of the result. */
Darkvater@2916: NPFFoundTargetData NPFRouteToStationOrTile(TileIndex tile, Trackdir trackdir, NPFFindStationOrTileData* target, TransportType type, Owner owner, RailType railtype);
matthijs@1247: /* Will search as above, but with two start nodes, the second being the
matthijs@1459:  * reverse. Look at the NPF_FLAG_REVERSE flag in the result node to see which
matthijs@1459:  * direction was taken (NPFGetBit(result.node, NPF_FLAG_REVERSE)) */
Darkvater@2916: NPFFoundTargetData NPFRouteToStationOrTileTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, NPFFindStationOrTileData* target, TransportType type, Owner owner, RailType railtype);
matthijs@1247: 
matthijs@1247: /* Will search a route to the closest depot. */
matthijs@1247: 
matthijs@1247: /* Search using breadth first. Good for little track choice and inaccurate
matthijs@1777:  * heuristic, such as railway/road.*/
matthijs@2006: NPFFoundTargetData NPFRouteToDepotBreadthFirst(TileIndex tile, Trackdir trackdir, TransportType type, Owner owner, RailType railtype);
matthijs@1777: /* Same as above but with two start nodes, the second being the reverse. Call
matthijs@1777:  * NPFGetBit(result.node, NPF_FLAG_REVERSE) to see from which node the path
matthijs@1777:  * orginated. All pathfs from the second node will have the given
matthijs@1777:  * reverse_penalty applied (NPF_TILE_LENGTH is the equivalent of one full
matthijs@1777:  * tile).
matthijs@1777:  */
matthijs@2006: NPFFoundTargetData NPFRouteToDepotBreadthFirstTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, TransportType type, Owner owner, RailType railtype, uint reverse_penalty);
matthijs@1247: /* Search by trying each depot in order of Manhattan Distance. Good for lots
matthijs@1330:  * of choices and accurate heuristics, such as water. */
matthijs@2006: NPFFoundTargetData NPFRouteToDepotTrialError(TileIndex tile, Trackdir trackdir, TransportType type, Owner owner, RailType railtype);
matthijs@1247: 
matthijs@1247: void NPFFillWithOrderData(NPFFindStationOrTileData* fstd, Vehicle* v);
matthijs@1247: 
matthijs@1459: 
matthijs@1459: /*
matthijs@1459:  * Functions to manipulate the various NPF related flags on an AyStarNode.
matthijs@1459:  */
matthijs@1459: 
matthijs@1459: /**
matthijs@1459:  * Returns the current value of the given flag on the given AyStarNode.
matthijs@1459:  */
matthijs@1459: static inline bool NPFGetFlag(const AyStarNode* node, NPFNodeFlag flag)
matthijs@1459: {
matthijs@1459: 	return HASBIT(node->user_data[NPF_NODE_FLAGS], flag);
matthijs@1459: }
matthijs@1459: 
matthijs@1459: /**
matthijs@1459:  * Sets the given flag on the given AyStarNode to the given value.
matthijs@1459:  */
matthijs@1459: static inline void NPFSetFlag(AyStarNode* node, NPFNodeFlag flag, bool value)
matthijs@1459: {
matthijs@1459: 	if (value)
matthijs@1459: 		SETBIT(node->user_data[NPF_NODE_FLAGS], flag);
matthijs@1459: 	else
matthijs@1459: 		CLRBIT(node->user_data[NPF_NODE_FLAGS], flag);
matthijs@1459: }
matthijs@1459: 
Darkvater@2436: #endif /* NPF_H */