yapf_rail.cpp

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00001 /* $Id: yapf_rail.cpp 15299 2009-01-31 20:16:06Z smatz $ */
00002 
00005 #include "../stdafx.h"
00006 
00007 #include "yapf.hpp"
00008 #include "yapf_node_rail.hpp"
00009 #include "yapf_costrail.hpp"
00010 #include "yapf_destrail.hpp"
00011 #include "../vehicle_func.h"
00012 #include "../functions.h"
00013 
00014 #define DEBUG_YAPF_CACHE 0
00015 
00016 int _total_pf_time_us = 0;
00017 
00018 
00019 
00020 template <class Types>
00021 class CYapfReserveTrack
00022 {
00023 public:
00024   typedef typename Types::Tpf Tpf;                     
00025   typedef typename Types::TrackFollower TrackFollower;
00026   typedef typename Types::NodeList::Titem Node;        
00027 
00028 protected:
00030   FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00031 
00032 private:
00033   TileIndex m_res_dest;         
00034   Trackdir  m_res_dest_td;      
00035   Node      *m_res_node;        
00036   TileIndex m_res_fail_tile;    
00037   Trackdir  m_res_fail_td;      
00038 
00039   bool FindSafePositionProc(TileIndex tile, Trackdir td)
00040   {
00041     if (IsSafeWaitingPosition(Yapf().GetVehicle(), tile, td, true, !TrackFollower::Allow90degTurns())) {
00042       m_res_dest = tile;
00043       m_res_dest_td = td;
00044       return false;   // Stop iterating segment
00045     }
00046     return true;
00047   }
00048 
00050   bool ReserveRailwayStationPlatform(TileIndex &tile, DiagDirection dir)
00051   {
00052     TileIndex     start = tile;
00053     TileIndexDiff diff = TileOffsByDiagDir(dir);
00054 
00055     do {
00056       if (GetRailwayStationReservation(tile)) return false;
00057       SetRailwayStationReservation(tile, true);
00058       MarkTileDirtyByTile(tile);
00059       tile = TILE_ADD(tile, diff);
00060     } while (IsCompatibleTrainStationTile(tile, start));
00061 
00062     return true;
00063   }
00064 
00066   bool ReserveSingleTrack(TileIndex tile, Trackdir td)
00067   {
00068     if (IsRailwayStationTile(tile)) {
00069       if (!ReserveRailwayStationPlatform(tile, TrackdirToExitdir(ReverseTrackdir(td)))) {
00070         /* Platform could not be reserved, undo. */
00071         m_res_fail_tile = tile;
00072         m_res_fail_td = td;
00073       }
00074     } else {
00075       if (!TryReserveRailTrack(tile, TrackdirToTrack(td))) {
00076         /* Tile couldn't be reserved, undo. */
00077         m_res_fail_tile = tile;
00078         m_res_fail_td = td;
00079         return false;
00080       }
00081     }
00082 
00083     return tile != m_res_dest;
00084   }
00085 
00087   bool UnreserveSingleTrack(TileIndex tile, Trackdir td)
00088   {
00089     if (IsRailwayStationTile(tile)) {
00090       TileIndex     start = tile;
00091       TileIndexDiff diff = TileOffsByDiagDir(TrackdirToExitdir(ReverseTrackdir(td)));
00092       while ((tile != m_res_fail_tile || td != m_res_fail_td) && IsCompatibleTrainStationTile(tile, start)) {
00093         SetRailwayStationReservation(tile, false);
00094         tile = TILE_ADD(tile, diff);
00095       }
00096     } else if (tile != m_res_fail_tile || td != m_res_fail_td) {
00097       UnreserveRailTrack(tile, TrackdirToTrack(td));
00098     }
00099     return tile != m_res_dest && (tile != m_res_fail_tile || td != m_res_fail_td);
00100   }
00101 
00102 public:
00104   inline void SetReservationTarget(Node *node, TileIndex tile, Trackdir td)
00105   {
00106     m_res_node = node;
00107     m_res_dest = tile;
00108     m_res_dest_td = td;
00109   }
00110 
00112   inline void FindSafePositionOnNode(Node *node)
00113   {
00114     assert(node->m_parent != NULL);
00115 
00116     /* We will never pass more than two signals, no need to check for a safe tile. */
00117     if (node->m_parent->m_num_signals_passed >= 2) return;
00118 
00119     if (!node->IterateTiles(Yapf().GetVehicle(), Yapf(), *this, &CYapfReserveTrack<Types>::FindSafePositionProc)) {
00120       m_res_node = node;
00121     }
00122   }
00123 
00125   bool TryReservePath(PBSTileInfo *target)
00126   {
00127     m_res_fail_tile = INVALID_TILE;
00128 
00129     if (target != NULL) {
00130       target->tile = m_res_dest;
00131       target->trackdir = m_res_dest_td;
00132       target->okay = false;
00133     }
00134 
00135     /* Don't bother if the target is reserved. */
00136     if (!IsWaitingPositionFree(Yapf().GetVehicle(), m_res_dest, m_res_dest_td)) return false;
00137 
00138     for (Node *node = m_res_node; node->m_parent != NULL; node = node->m_parent) {
00139       node->IterateTiles(Yapf().GetVehicle(), Yapf(), *this, &CYapfReserveTrack<Types>::ReserveSingleTrack);
00140       if (m_res_fail_tile != INVALID_TILE) {
00141         /* Reservation failed, undo. */
00142         Node *fail_node = m_res_node;
00143         TileIndex stop_tile = m_res_fail_tile;
00144         do {
00145           /* If this is the node that failed, stop at the failed tile. */
00146           m_res_fail_tile = fail_node == node ? stop_tile : INVALID_TILE;
00147           fail_node->IterateTiles(Yapf().GetVehicle(), Yapf(), *this, &CYapfReserveTrack<Types>::UnreserveSingleTrack);
00148         } while (fail_node != node && (fail_node = fail_node->m_parent) != NULL);
00149 
00150         return false;
00151       }
00152     }
00153 
00154     if (target != NULL) target->okay = true;
00155 
00156     if (Yapf().CanUseGlobalCache(*m_res_node))
00157       YapfNotifyTrackLayoutChange(INVALID_TILE, INVALID_TRACK);
00158 
00159     return true;
00160   }
00161 };
00162 
00163 template <class Types>
00164 class CYapfFollowAnyDepotRailT
00165 {
00166 public:
00167   typedef typename Types::Tpf Tpf;                     
00168   typedef typename Types::TrackFollower TrackFollower;
00169   typedef typename Types::NodeList::Titem Node;        
00170   typedef typename Node::Key Key;                      
00171 
00172 protected:
00174   FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00175 
00176 public:
00180   inline void PfFollowNode(Node& old_node)
00181   {
00182     TrackFollower F(Yapf().GetVehicle());
00183     if (F.Follow(old_node.GetLastTile(), old_node.GetLastTrackdir()))
00184       Yapf().AddMultipleNodes(&old_node, F);
00185   }
00186 
00188   FORCEINLINE char TransportTypeChar() const {return 't';}
00189 
00190   static bool stFindNearestDepotTwoWay(const Vehicle *v, TileIndex t1, Trackdir td1, TileIndex t2, Trackdir td2, int max_distance, int reverse_penalty, TileIndex *depot_tile, bool *reversed)
00191   {
00192     Tpf pf1;
00193     bool result1 = pf1.FindNearestDepotTwoWay(v, t1, td1, t2, td2, max_distance, reverse_penalty, depot_tile, reversed);
00194 
00195 #if DEBUG_YAPF_CACHE
00196     Tpf pf2;
00197     TileIndex depot_tile2 = INVALID_TILE;
00198     bool reversed2 = false;
00199     pf2.DisableCache(true);
00200     bool result2 = pf2.FindNearestDepotTwoWay(v, t1, td1, t2, td2, max_distance, reverse_penalty, &depot_tile2, &reversed2);
00201     if (result1 != result2 || (result1 && (*depot_tile != depot_tile2 || *reversed != reversed2))) {
00202       DEBUG(yapf, 0, "CACHE ERROR: FindNearestDepotTwoWay() = [%s, %s]", result1 ? "T" : "F", result2 ? "T" : "F");
00203     }
00204 #endif
00205 
00206     return result1;
00207   }
00208 
00209   FORCEINLINE bool FindNearestDepotTwoWay(const Vehicle *v, TileIndex t1, Trackdir td1, TileIndex t2, Trackdir td2, int max_distance, int reverse_penalty, TileIndex *depot_tile, bool *reversed)
00210   {
00211     // set origin and destination nodes
00212     Yapf().SetOrigin(t1, td1, t2, td2, reverse_penalty, true);
00213     Yapf().SetDestination(v);
00214     Yapf().SetMaxCost(YAPF_TILE_LENGTH * max_distance);
00215 
00216     // find the best path
00217     bool bFound = Yapf().FindPath(v);
00218     if (!bFound) return false;
00219 
00220     // some path found
00221     // get found depot tile
00222     Node *n = Yapf().GetBestNode();
00223     *depot_tile = n->GetLastTile();
00224 
00225     // walk through the path back to the origin
00226     Node *pNode = n;
00227     while (pNode->m_parent != NULL) {
00228       pNode = pNode->m_parent;
00229     }
00230 
00231     // if the origin node is our front vehicle tile/Trackdir then we didn't reverse
00232     // but we can also look at the cost (== 0 -> not reversed, == reverse_penalty -> reversed)
00233     *reversed = (pNode->m_cost != 0);
00234 
00235     return true;
00236   }
00237 };
00238 
00239 template <class Types>
00240 class CYapfFollowAnySafeTileRailT : public CYapfReserveTrack<Types>
00241 {
00242 public:
00243   typedef typename Types::Tpf Tpf;                     
00244   typedef typename Types::TrackFollower TrackFollower;
00245   typedef typename Types::NodeList::Titem Node;        
00246   typedef typename Node::Key Key;                      
00247 
00248 protected:
00250   FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00251 
00252 public:
00256   inline void PfFollowNode(Node& old_node)
00257   {
00258     TrackFollower F(Yapf().GetVehicle(), Yapf().GetCompatibleRailTypes());
00259     if (F.Follow(old_node.GetLastTile(), old_node.GetLastTrackdir()) && F.MaskReservedTracks())
00260       Yapf().AddMultipleNodes(&old_node, F);
00261   }
00262 
00264   FORCEINLINE char TransportTypeChar() const {return 't';}
00265 
00266   static bool stFindNearestSafeTile(const Vehicle *v, TileIndex t1, Trackdir td, bool override_railtype)
00267   {
00268     /* Create pathfinder instance */
00269     Tpf pf1;
00270 #if !DEBUG_YAPF_CACHE
00271     bool result1 = pf1.FindNearestSafeTile(v, t1, td, override_railtype, false);
00272 
00273 #else
00274     bool result2 = pf1.FindNearestSafeTile(v, t1, td, override_railtype, true);
00275     Tpf pf2;
00276     pf2.DisableCache(true);
00277     bool result1 = pf2.FindNearestSafeTile(v, t1, td, override_railtype, false);
00278     if (result1 != result2) {
00279       DEBUG(yapf, 0, "CACHE ERROR: FindSafeTile() = [%s, %s]", result2 ? "T" : "F", result1 ? "T" : "F");
00280       DumpTarget dmp1, dmp2;
00281       pf1.DumpBase(dmp1);
00282       pf2.DumpBase(dmp2);
00283       FILE *f1 = fopen("C:\\yapf1.txt", "wt");
00284       FILE *f2 = fopen("C:\\yapf2.txt", "wt");
00285       fwrite(dmp1.m_out.Data(), 1, dmp1.m_out.Size(), f1);
00286       fwrite(dmp2.m_out.Data(), 1, dmp2.m_out.Size(), f2);
00287       fclose(f1);
00288       fclose(f2);
00289     }
00290 #endif
00291 
00292     return result1;
00293   }
00294 
00295   bool FindNearestSafeTile(const Vehicle *v, TileIndex t1, Trackdir td, bool override_railtype, bool dont_reserve)
00296   {
00297     /* Set origin and destination. */
00298     Yapf().SetOrigin(t1, td);
00299     Yapf().SetDestination(v, override_railtype);
00300 
00301     bool bFound = Yapf().FindPath(v);
00302     if (!bFound) return false;
00303 
00304     /* Found a destination, set as reservation target. */
00305     Node *pNode = Yapf().GetBestNode();
00306     this->SetReservationTarget(pNode, pNode->GetLastTile(), pNode->GetLastTrackdir());
00307 
00308     /* Walk through the path back to the origin. */
00309     Node *pPrev = NULL;
00310     while (pNode->m_parent != NULL) {
00311       pPrev = pNode;
00312       pNode = pNode->m_parent;
00313 
00314       this->FindSafePositionOnNode(pPrev);
00315     }
00316 
00317     return dont_reserve || this->TryReservePath(NULL);
00318   }
00319 };
00320 
00321 template <class Types>
00322 class CYapfFollowRailT : public CYapfReserveTrack<Types>
00323 {
00324 public:
00325   typedef typename Types::Tpf Tpf;                     
00326   typedef typename Types::TrackFollower TrackFollower;
00327   typedef typename Types::NodeList::Titem Node;        
00328   typedef typename Node::Key Key;                      
00329 
00330 protected:
00332   FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00333 
00334 public:
00338   inline void PfFollowNode(Node& old_node)
00339   {
00340     TrackFollower F(Yapf().GetVehicle());
00341     if (F.Follow(old_node.GetLastTile(), old_node.GetLastTrackdir()))
00342       Yapf().AddMultipleNodes(&old_node, F);
00343   }
00344 
00346   FORCEINLINE char TransportTypeChar() const {return 't';}
00347 
00348   static Trackdir stChooseRailTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool *path_not_found, bool reserve_track, PBSTileInfo *target)
00349   {
00350     // create pathfinder instance
00351     Tpf pf1;
00352 #if !DEBUG_YAPF_CACHE
00353     Trackdir result1 = pf1.ChooseRailTrack(v, tile, enterdir, tracks, path_not_found, reserve_track, target);
00354 
00355 #else
00356     Trackdir result1 = pf1.ChooseRailTrack(v, tile, enterdir, tracks, path_not_found, false, NULL);
00357     Tpf pf2;
00358     pf2.DisableCache(true);
00359     Trackdir result2 = pf2.ChooseRailTrack(v, tile, enterdir, tracks, path_not_found, reserve_track, target);
00360     if (result1 != result2) {
00361       DEBUG(yapf, 0, "CACHE ERROR: ChooseRailTrack() = [%d, %d]", result1, result2);
00362       DumpTarget dmp1, dmp2;
00363       pf1.DumpBase(dmp1);
00364       pf2.DumpBase(dmp2);
00365       FILE *f1 = fopen("C:\\yapf1.txt", "wt");
00366       FILE *f2 = fopen("C:\\yapf2.txt", "wt");
00367       fwrite(dmp1.m_out.Data(), 1, dmp1.m_out.Size(), f1);
00368       fwrite(dmp2.m_out.Data(), 1, dmp2.m_out.Size(), f2);
00369       fclose(f1);
00370       fclose(f2);
00371     }
00372 #endif
00373 
00374     return result1;
00375   }
00376 
00377   FORCEINLINE Trackdir ChooseRailTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool *path_not_found, bool reserve_track, PBSTileInfo *target)
00378   {
00379     if (target != NULL) target->tile = INVALID_TILE;
00380 
00381     // set origin and destination nodes
00382     PBSTileInfo origin = FollowTrainReservation(v);
00383     Yapf().SetOrigin(origin.tile, origin.trackdir, INVALID_TILE, INVALID_TRACKDIR, 1, true);
00384     Yapf().SetDestination(v);
00385 
00386     // find the best path
00387     bool path_found = Yapf().FindPath(v);
00388     if (path_not_found != NULL) {
00389       // tell controller that the path was only 'guessed'
00390       // treat the path as found if stopped on the first two way signal(s)
00391       *path_not_found = !(path_found || Yapf().m_stopped_on_first_two_way_signal);
00392     }
00393 
00394     // if path not found - return INVALID_TRACKDIR
00395     Trackdir next_trackdir = INVALID_TRACKDIR;
00396     Node *pNode = Yapf().GetBestNode();
00397     if (pNode != NULL) {
00398       // reserve till end of path
00399       this->SetReservationTarget(pNode, pNode->GetLastTile(), pNode->GetLastTrackdir());
00400 
00401       // path was found or at least suggested
00402       // walk through the path back to the origin
00403       Node *pPrev = NULL;
00404       while (pNode->m_parent != NULL) {
00405         pPrev = pNode;
00406         pNode = pNode->m_parent;
00407 
00408         this->FindSafePositionOnNode(pPrev);
00409       }
00410       // return trackdir from the best origin node (one of start nodes)
00411       Node& best_next_node = *pPrev;
00412       next_trackdir = best_next_node.GetTrackdir();
00413 
00414       if (reserve_track && path_found) this->TryReservePath(target);
00415     }
00416     return next_trackdir;
00417   }
00418 
00419   static bool stCheckReverseTrain(const Vehicle *v, TileIndex t1, Trackdir td1, TileIndex t2, Trackdir td2, int reverse_penalty)
00420   {
00421     Tpf pf1;
00422     bool result1 = pf1.CheckReverseTrain(v, t1, td1, t2, td2, reverse_penalty);
00423 
00424 #if DEBUG_YAPF_CACHE
00425     Tpf pf2;
00426     pf2.DisableCache(true);
00427     bool result2 = pf2.CheckReverseTrain(v, t1, td1, t2, td2, reverse_penalty);
00428     if (result1 != result2) {
00429       DEBUG(yapf, 0, "CACHE ERROR: CheckReverseTrain() = [%s, %s]", result1 ? "T" : "F", result2 ? "T" : "F");
00430     }
00431 #endif
00432 
00433     return result1;
00434   }
00435 
00436   FORCEINLINE bool CheckReverseTrain(const Vehicle *v, TileIndex t1, Trackdir td1, TileIndex t2, Trackdir td2, int reverse_penalty)
00437   {
00438     // create pathfinder instance
00439     // set origin and destination nodes
00440     Yapf().SetOrigin(t1, td1, t2, td2, reverse_penalty, false);
00441     Yapf().SetDestination(v);
00442 
00443     // find the best path
00444     bool bFound = Yapf().FindPath(v);
00445 
00446     if (!bFound) return false;
00447 
00448     // path was found
00449     // walk through the path back to the origin
00450     Node *pNode = Yapf().GetBestNode();
00451     while (pNode->m_parent != NULL) {
00452       pNode = pNode->m_parent;
00453     }
00454 
00455     // check if it was reversed origin
00456     Node& best_org_node = *pNode;
00457     bool reversed = (best_org_node.m_cost != 0);
00458     return reversed;
00459   }
00460 };
00461 
00462 template <class Tpf_, class Ttrack_follower, class Tnode_list, template <class Types> class TdestinationT, template <class Types> class TfollowT>
00463 struct CYapfRail_TypesT
00464 {
00465   typedef CYapfRail_TypesT<Tpf_, Ttrack_follower, Tnode_list, TdestinationT, TfollowT>  Types;
00466 
00467   typedef Tpf_                                Tpf;
00468   typedef Ttrack_follower                     TrackFollower;
00469   typedef Tnode_list                          NodeList;
00470   typedef CYapfBaseT<Types>                   PfBase;
00471   typedef TfollowT<Types>                     PfFollow;
00472   typedef CYapfOriginTileTwoWayT<Types>       PfOrigin;
00473   typedef TdestinationT<Types>                PfDestination;
00474   typedef CYapfSegmentCostCacheGlobalT<Types> PfCache;
00475   typedef CYapfCostRailT<Types>               PfCost;
00476 };
00477 
00478 struct CYapfRail1         : CYapfT<CYapfRail_TypesT<CYapfRail1        , CFollowTrackRail    , CRailNodeListTrackDir, CYapfDestinationTileOrStationRailT, CYapfFollowRailT> > {};
00479 struct CYapfRail2         : CYapfT<CYapfRail_TypesT<CYapfRail2        , CFollowTrackRailNo90, CRailNodeListTrackDir, CYapfDestinationTileOrStationRailT, CYapfFollowRailT> > {};
00480 
00481 struct CYapfAnyDepotRail1 : CYapfT<CYapfRail_TypesT<CYapfAnyDepotRail1, CFollowTrackRail    , CRailNodeListTrackDir, CYapfDestinationAnyDepotRailT     , CYapfFollowAnyDepotRailT> > {};
00482 struct CYapfAnyDepotRail2 : CYapfT<CYapfRail_TypesT<CYapfAnyDepotRail2, CFollowTrackRailNo90, CRailNodeListTrackDir, CYapfDestinationAnyDepotRailT     , CYapfFollowAnyDepotRailT> > {};
00483 
00484 struct CYapfAnySafeTileRail1 : CYapfT<CYapfRail_TypesT<CYapfAnySafeTileRail1, CFollowTrackFreeRail    , CRailNodeListTrackDir, CYapfDestinationAnySafeTileRailT , CYapfFollowAnySafeTileRailT> > {};
00485 struct CYapfAnySafeTileRail2 : CYapfT<CYapfRail_TypesT<CYapfAnySafeTileRail2, CFollowTrackFreeRailNo90, CRailNodeListTrackDir, CYapfDestinationAnySafeTileRailT , CYapfFollowAnySafeTileRailT> > {};
00486 
00487 
00488 Trackdir YapfChooseRailTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool *path_not_found, bool reserve_track, PBSTileInfo *target)
00489 {
00490   // default is YAPF type 2
00491   typedef Trackdir (*PfnChooseRailTrack)(const Vehicle*, TileIndex, DiagDirection, TrackBits, bool*, bool, PBSTileInfo*);
00492   PfnChooseRailTrack pfnChooseRailTrack = &CYapfRail1::stChooseRailTrack;
00493 
00494   // check if non-default YAPF type needed
00495   if (_settings_game.pf.forbid_90_deg) {
00496     pfnChooseRailTrack = &CYapfRail2::stChooseRailTrack; // Trackdir, forbid 90-deg
00497   }
00498 
00499   Trackdir td_ret = pfnChooseRailTrack(v, tile, enterdir, tracks, path_not_found, reserve_track, target);
00500 
00501   return td_ret;
00502 }
00503 
00504 bool YapfCheckReverseTrain(const Vehicle *v)
00505 {
00506   /* last wagon */
00507   const Vehicle *last_veh = GetLastVehicleInChain(v);
00508 
00509   // get trackdirs of both ends
00510   Trackdir td = GetVehicleTrackdir(v);
00511   Trackdir td_rev = ReverseTrackdir(GetVehicleTrackdir(last_veh));
00512 
00513   /* tiles where front and back are */
00514   TileIndex tile = v->tile;
00515   TileIndex tile_rev = last_veh->tile;
00516 
00517   int reverse_penalty = 0;
00518 
00519   if (v->u.rail.track == TRACK_BIT_WORMHOLE) {
00520     /* front in tunnel / on bridge */
00521     DiagDirection dir_into_wormhole = GetTunnelBridgeDirection(tile);
00522 
00523     if (TrackdirToExitdir(td) == dir_into_wormhole) tile = GetOtherTunnelBridgeEnd(tile);
00524     /* Now 'tile' is the tunnel entry/bridge ramp the train will reach when driving forward */
00525 
00526     /* Current position of the train in the wormhole */
00527     TileIndex cur_tile = TileVirtXY(v->x_pos, v->y_pos);
00528 
00529     /* Add distance to drive in the wormhole as penalty for the forward path, i.e. bonus for the reverse path
00530      * Note: Negative penalties are ok for the start tile. */
00531     reverse_penalty -= DistanceManhattan(cur_tile, tile) * YAPF_TILE_LENGTH;
00532   }
00533 
00534   if (last_veh->u.rail.track == TRACK_BIT_WORMHOLE) {
00535     /* back in tunnel / on bridge */
00536     DiagDirection dir_into_wormhole = GetTunnelBridgeDirection(tile_rev);
00537 
00538     if (TrackdirToExitdir(td_rev) == dir_into_wormhole) tile_rev = GetOtherTunnelBridgeEnd(tile_rev);
00539     /* Now 'tile_rev' is the tunnel entry/bridge ramp the train will reach when reversing */
00540 
00541     /* Current position of the last wagon in the wormhole */
00542     TileIndex cur_tile = TileVirtXY(last_veh->x_pos, last_veh->y_pos);
00543 
00544     /* Add distance to drive in the wormhole as penalty for the revere path. */
00545     reverse_penalty += DistanceManhattan(cur_tile, tile_rev) * YAPF_TILE_LENGTH;
00546   }
00547 
00548   typedef bool (*PfnCheckReverseTrain)(const Vehicle*, TileIndex, Trackdir, TileIndex, Trackdir, int);
00549   PfnCheckReverseTrain pfnCheckReverseTrain = CYapfRail1::stCheckReverseTrain;
00550 
00551   // check if non-default YAPF type needed
00552   if (_settings_game.pf.forbid_90_deg) {
00553     pfnCheckReverseTrain = &CYapfRail2::stCheckReverseTrain; // Trackdir, forbid 90-deg
00554   }
00555 
00556   /* slightly hackish: If the pathfinders finds a path, the cost of the first node is tested to distinguish between forward- and reverse-path. */
00557   if (reverse_penalty == 0) reverse_penalty = 1;
00558 
00559   bool reverse = pfnCheckReverseTrain(v, tile, td, tile_rev, td_rev, reverse_penalty);
00560 
00561   return reverse;
00562 }
00563 
00564 bool YapfFindNearestRailDepotTwoWay(const Vehicle *v, int max_distance, int reverse_penalty, TileIndex *depot_tile, bool *reversed)
00565 {
00566   *depot_tile = INVALID_TILE;
00567   *reversed = false;
00568 
00569   const Vehicle *last_veh = GetLastVehicleInChain(v);
00570 
00571   PBSTileInfo origin = FollowTrainReservation(v);
00572   TileIndex last_tile = last_veh->tile;
00573   Trackdir td_rev = ReverseTrackdir(GetVehicleTrackdir(last_veh));
00574 
00575   typedef bool (*PfnFindNearestDepotTwoWay)(const Vehicle*, TileIndex, Trackdir, TileIndex, Trackdir, int, int, TileIndex*, bool*);
00576   PfnFindNearestDepotTwoWay pfnFindNearestDepotTwoWay = &CYapfAnyDepotRail1::stFindNearestDepotTwoWay;
00577 
00578   // check if non-default YAPF type needed
00579   if (_settings_game.pf.forbid_90_deg) {
00580     pfnFindNearestDepotTwoWay = &CYapfAnyDepotRail2::stFindNearestDepotTwoWay; // Trackdir, forbid 90-deg
00581   }
00582 
00583   bool ret = pfnFindNearestDepotTwoWay(v, origin.tile, origin.trackdir, last_tile, td_rev, max_distance, reverse_penalty, depot_tile, reversed);
00584   return ret;
00585 }
00586 
00587 bool YapfRailFindNearestSafeTile(const Vehicle *v, TileIndex tile, Trackdir td, bool override_railtype)
00588 {
00589   typedef bool (*PfnFindNearestSafeTile)(const Vehicle*, TileIndex, Trackdir, bool);
00590   PfnFindNearestSafeTile pfnFindNearestSafeTile = CYapfAnySafeTileRail1::stFindNearestSafeTile;
00591 
00592   /* check if non-default YAPF type needed */
00593   if (_settings_game.pf.forbid_90_deg) {
00594     pfnFindNearestSafeTile = &CYapfAnySafeTileRail2::stFindNearestSafeTile;
00595   }
00596 
00597   return pfnFindNearestSafeTile(v, tile, td, override_railtype);
00598 }
00599 
00601 int CSegmentCostCacheBase::s_rail_change_counter = 0;
00602 
00603 void YapfNotifyTrackLayoutChange(TileIndex tile, Track track) {CSegmentCostCacheBase::NotifyTrackLayoutChange(tile, track);}

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