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annotate src/npf.h @ 8139:db99ba38abc0 draft

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(svn r11701) -Codechange: removal unnecessary inclusions of map.h (and split map.h).
author rubidium <rubidium@openttd.org>
date Wed, 26 Dec 2007 11:45:43 +0000
parents 4faab45e2603
children 31f5d2fa3bb7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* $Id$ */
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2
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3 /** @file npf.h */
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4
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5 #ifndef NPF_H
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6 #define NPF_H
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7
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8 #include "openttd.h"
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9 #include "aystar.h"
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10 #include "station.h"
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11 #include "vehicle_type.h"
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12 #include "tile_type.h"
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13 #include "track_type.h"
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15 /* mowing grass */
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16 enum {
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17 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.
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18 /* Do no change below values */
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19 NPF_HASH_SIZE = 1 << NPF_HASH_BITS,
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20 NPF_HASH_HALFBITS = NPF_HASH_BITS / 2,
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21 NPF_HASH_HALFMASK = (1 << NPF_HASH_HALFBITS) - 1
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22 };
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23
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24 /* For new pathfinding. Define here so it is globally available without having
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25 * to include npf.h */
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26 enum {
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27 NPF_TILE_LENGTH = 100
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28 };
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29
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30 enum {
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31 /** This penalty is the equivalent of "inifite", which means that paths that
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32 * get this penalty will be chosen, but only if there is no other route
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33 * without it. Be careful with not applying this penalty to often, or the
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34 * total path cost might overflow..
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35 * For now, this is just a Very Big Penalty, we might actually implement
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36 * this in a nicer way :-)
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37 */
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38 NPF_INFINITE_PENALTY = 1000 * NPF_TILE_LENGTH
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39 };
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41 /* Meant to be stored in AyStar.targetdata */
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42 struct NPFFindStationOrTileData {
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43 TileIndex dest_coords; ///< An indication of where the station is, for heuristic purposes, or the target tile
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44 StationID station_index; ///< station index we're heading for, or INVALID_STATION when we're heading for a tile
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45 };
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47 /* Indices into AyStar.userdata[] */
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48 enum {
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49 NPF_TYPE = 0, ///< Contains a TransportTypes value
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50 NPF_SUB_TYPE, ///< Contains the sub transport type
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51 NPF_OWNER, ///< Contains an Owner value
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52 NPF_RAILTYPES, ///< Contains a bitmask the compatible RailTypes of the engine when NPF_TYPE == TRANSPORT_RAIL. Unused otherwise.
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53 };
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54
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55 /* Indices into AyStarNode.userdata[] */
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56 enum {
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57 NPF_TRACKDIR_CHOICE = 0, ///< The trackdir chosen to get here
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58 NPF_NODE_FLAGS,
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59 };
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61 /* Flags for AyStarNode.userdata[NPF_NODE_FLAGS]. Use NPFGetBit() and NPFGetBit() to use them. */
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62 enum NPFNodeFlag {
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63 NPF_FLAG_SEEN_SIGNAL, ///< Used to mark that a signal was seen on the way, for rail only
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64 NPF_FLAG_REVERSE, ///< Used to mark that this node was reached from the second start node, if applicable
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65 NPF_FLAG_LAST_SIGNAL_RED, ///< Used to mark that the last signal on this path was red
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66 };
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67
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68 /* Meant to be stored in AyStar.userpath */
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69 struct NPFFoundTargetData {
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70 uint best_bird_dist; ///< The best heuristic found. Is 0 if the target was found
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71 uint best_path_dist; ///< The shortest path. Is (uint)-1 if no path is found
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72 Trackdir best_trackdir; ///< The trackdir that leads to the shortest path/closest birds dist
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73 AyStarNode node; ///< The node within the target the search led us to
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74 };
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76 /* These functions below are _not_ re-entrant, in favor of speed! */
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77
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78 /* Will search from the given tile and direction, for a route to the given
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79 * station for the given transport type. See the declaration of
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80 * NPFFoundTargetData above for the meaning of the result. */
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81 NPFFoundTargetData NPFRouteToStationOrTile(TileIndex tile, Trackdir trackdir, NPFFindStationOrTileData* target, TransportType type, uint sub_type, Owner owner, RailTypeMask railtypes);
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82
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83 /* Will search as above, but with two start nodes, the second being the
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84 * reverse. Look at the NPF_FLAG_REVERSE flag in the result node to see which
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85 * direction was taken (NPFGetBit(result.node, NPF_FLAG_REVERSE)) */
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86 NPFFoundTargetData NPFRouteToStationOrTileTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, NPFFindStationOrTileData* target, TransportType type, uint sub_type, Owner owner, RailTypeMask railtypes);
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87
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88 /* Will search a route to the closest depot. */
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89
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90 /* Search using breadth first. Good for little track choice and inaccurate
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91 * heuristic, such as railway/road.*/
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92 NPFFoundTargetData NPFRouteToDepotBreadthFirst(TileIndex tile, Trackdir trackdir, TransportType type, uint sub_type, Owner owner, RailTypeMask railtypes);
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93 /* Same as above but with two start nodes, the second being the reverse. Call
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94 * NPFGetBit(result.node, NPF_FLAG_REVERSE) to see from which node the path
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95 * orginated. All pathfs from the second node will have the given
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96 * reverse_penalty applied (NPF_TILE_LENGTH is the equivalent of one full
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97 * tile).
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98 */
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99 NPFFoundTargetData NPFRouteToDepotBreadthFirstTwoWay(TileIndex tile1, Trackdir trackdir1, TileIndex tile2, Trackdir trackdir2, TransportType type, uint sub_type, Owner owner, RailTypeMask railtypes, uint reverse_penalty);
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100 /* Search by trying each depot in order of Manhattan Distance. Good for lots
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101 * of choices and accurate heuristics, such as water. */
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102 NPFFoundTargetData NPFRouteToDepotTrialError(TileIndex tile, Trackdir trackdir, TransportType type, uint sub_type, Owner owner, RailTypeMask railtypes);
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103
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104 void NPFFillWithOrderData(NPFFindStationOrTileData* fstd, Vehicle* v);
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105
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106
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107 /*
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108 * Functions to manipulate the various NPF related flags on an AyStarNode.
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109 */
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110
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111 /**
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112 * Returns the current value of the given flag on the given AyStarNode.
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113 */
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114 static inline bool NPFGetFlag(const AyStarNode* node, NPFNodeFlag flag)
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115 {
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116 return HasBit(node->user_data[NPF_NODE_FLAGS], flag);
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117 }
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118
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119 /**
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120 * Sets the given flag on the given AyStarNode to the given value.
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121 */
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122 static inline void NPFSetFlag(AyStarNode* node, NPFNodeFlag flag, bool value)
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123 {
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124 if (value)
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125 SetBit(node->user_data[NPF_NODE_FLAGS], flag);
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126 else
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127 ClrBit(node->user_data[NPF_NODE_FLAGS], flag);
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128 }
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129
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130 #endif /* NPF_H */