1

/* $Id$ */

     2

     3

#ifndef NPF_H

     4

#define NPF_H

     5

     6

#include "openttd.h"

     7

#include "aystar.h"

     8

#include "vehicle.h"

     9

#include "tile.h"

    10

#include "variables.h"

    11

    12

//mowing grass

    13

enum {

    14

	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. */

    15

	/* Do no change below values */

    16

	NPF_HASH_SIZE = 1 << NPF_HASH_BITS,

    17

	NPF_HASH_HALFBITS = NPF_HASH_BITS / 2,

    18

	NPF_HASH_HALFMASK = (1 << NPF_HASH_HALFBITS) - 1

    19

};

    20

    21

enum {

    22

	/** This penalty is the equivalent of "inifite", which means that paths that

    23

	 * get this penalty will be chosen, but only if there is no other route

    24

	 * without it. Be careful with not applying this penalty to often, or the

    25

	 * total path cost might overflow..

    26

	 * For now, this is just a Very Big Penalty, we might actually implement

    27

	 * this in a nicer way :-)

    28

	 */

    29

	NPF_INFINITE_PENALTY = 1000 * NPF_TILE_LENGTH

    30

};

    31

    32

typedef struct NPFFindStationOrTileData { /* Meant to be stored in AyStar.targetdata */

    33

	TileIndex dest_coords; /* An indication of where the station is, for heuristic purposes, or the target tile */

    34

	int station_index; /* station index we're heading for, or -1 when we're heading for a tile */

    35

} NPFFindStationOrTileData;

    36

    37

enum { /* Indices into AyStar.userdata[] */

    38

	NPF_TYPE = 0, /* Contains a TransportTypes value */

    39

	NPF_OWNER, /* Contains an Owner value */

    40

	NPF_RAILTYPE, /* Contains the RailType value of the engine when NPF_TYPE == TRANSPORT_RAIL. Unused otherwise. */

    41

};

    42

    43

enum { /* Indices into AyStarNode.userdata[] */

    44

	NPF_TRACKDIR_CHOICE = 0, /* The trackdir chosen to get here */

    45

	NPF_NODE_FLAGS,

    46

};

    47

    48

typedef enum { /* Flags for AyStarNode.userdata[NPF_NODE_FLAGS]. Use NPFGetBit() and NPFGetBit() to use them. */

    49

	NPF_FLAG_SEEN_SIGNAL, /* Used to mark that a signal was seen on the way, for rail only */

    50

	NPF_FLAG_REVERSE, /* Used to mark that this node was reached from the second start node, if applicable */

    51

	NPF_FLAG_LAST_SIGNAL_RED, /* Used to mark that the last signal on this path was red */

    52

} NPFNodeFlag;

    53

    54

typedef struct NPFFoundTargetData { /* Meant to be stored in AyStar.userpath */

    55

	uint best_bird_dist; /* The best heuristic found. Is 0 if the target was found */

    56

	uint best_path_dist; /* The shortest path. Is (uint)-1 if no path is found */

    57

	Trackdir best_trackdir; /* The trackdir that leads to the shortest path/closest birds dist */

    58

	AyStarNode node; /* The node within the target the search led us to */

    59

} NPFFoundTargetData;

    60

    61

/* These functions below are _not_ re-entrant, in favor of speed! */

    62

    63

/* Will search from the given tile and direction, for a route to the given

    64

 * station for the given transport type. See the declaration of

    65

 * NPFFoundTargetData above for the meaning of the result. */

    66

NPFFoundTargetData NPFRouteToStationOrTile(TileIndex tile, Trackdir trackdir, NPFFindStationOrTileData* target, TransportType type, Owner owner, RailType railtype);

    67

/* Will search as above, but with two start nodes, the second being the

    68

 * reverse. Look at the NPF_FLAG_REVERSE flag in the result node to see which

    69

 * direction was taken (NPFGetBit(result.node, NPF_FLAG_REVERSE)) */

    70

NPFFoundTargetData NPFRouteToStationOrTileTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, NPFFindStationOrTileData* target, TransportType type, Owner owner, RailType railtype);

    71

    72

/* Will search a route to the closest depot. */

    73

    74

/* Search using breadth first. Good for little track choice and inaccurate

    75

 * heuristic, such as railway/road.*/

    76

NPFFoundTargetData NPFRouteToDepotBreadthFirst(TileIndex tile, Trackdir trackdir, TransportType type, Owner owner, RailType railtype);

    77

/* Same as above but with two start nodes, the second being the reverse. Call

    78

 * NPFGetBit(result.node, NPF_FLAG_REVERSE) to see from which node the path

    79

 * orginated. All pathfs from the second node will have the given

    80

 * reverse_penalty applied (NPF_TILE_LENGTH is the equivalent of one full

    81

 * tile).

    82

 */

    83

NPFFoundTargetData NPFRouteToDepotBreadthFirstTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, TransportType type, Owner owner, RailType railtype, uint reverse_penalty);

    84

/* Search by trying each depot in order of Manhattan Distance. Good for lots

    85

 * of choices and accurate heuristics, such as water. */

    86

NPFFoundTargetData NPFRouteToDepotTrialError(TileIndex tile, Trackdir trackdir, TransportType type, Owner owner, RailType railtype);

    87

    88

void NPFFillWithOrderData(NPFFindStationOrTileData* fstd, Vehicle* v);

    89

    90

    91

/*

    92

 * Functions to manipulate the various NPF related flags on an AyStarNode.

    93

 */

    94

    95

/**

    96

 * Returns the current value of the given flag on the given AyStarNode.

    97

 */

    98

static inline bool NPFGetFlag(const AyStarNode* node, NPFNodeFlag flag)

    99

{

   100

	return HASBIT(node->user_data[NPF_NODE_FLAGS], flag);

   101

}

   102

   103

/**

   104

 * Sets the given flag on the given AyStarNode to the given value.

   105

 */

   106

static inline void NPFSetFlag(AyStarNode* node, NPFNodeFlag flag, bool value)

   107

{

   108

	if (value)

   109

		SETBIT(node->user_data[NPF_NODE_FLAGS], flag);

   110

	else

   111

		CLRBIT(node->user_data[NPF_NODE_FLAGS], flag);

   112

}

   113

   114

#endif /* NPF_H */