yapf_road.cpp

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00001 /* $Id: yapf_road.cpp 14949 2009-01-10 00:31:47Z rubidium $ */
00002 
00005 #include "../stdafx.h"
00006 #include "../depot_base.h"
00007 
00008 #include "yapf.hpp"
00009 #include "yapf_node_road.hpp"
00010 
00011 
00012 template <class Types>
00013 class CYapfCostRoadT
00014 {
00015 public:
00016   typedef typename Types::Tpf Tpf; 
00017   typedef typename Types::TrackFollower TrackFollower; 
00018   typedef typename Types::NodeList::Titem Node; 
00019   typedef typename Node::Key Key;    
00020 
00021 protected:
00023   Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00024 
00025   int SlopeCost(TileIndex tile, TileIndex next_tile, Trackdir trackdir)
00026   {
00027     // height of the center of the current tile
00028     int x1 = TileX(tile) * TILE_SIZE;
00029     int y1 = TileY(tile) * TILE_SIZE;
00030     int z1 = GetSlopeZ(x1 + TILE_SIZE / 2, y1 + TILE_SIZE / 2);
00031 
00032     // height of the center of the next tile
00033     int x2 = TileX(next_tile) * TILE_SIZE;
00034     int y2 = TileY(next_tile) * TILE_SIZE;
00035     int z2 = GetSlopeZ(x2 + TILE_SIZE / 2, y2 + TILE_SIZE / 2);
00036 
00037     if (z2 - z1 > 1) {
00038       /* Slope up */
00039       return Yapf().PfGetSettings().road_slope_penalty;
00040     }
00041     return 0;
00042   }
00043 
00045   FORCEINLINE int OneTileCost(TileIndex tile, Trackdir trackdir)
00046   {
00047     int cost = 0;
00048     // set base cost
00049     if (IsDiagonalTrackdir(trackdir)) {
00050       cost += YAPF_TILE_LENGTH;
00051       switch (GetTileType(tile)) {
00052         case MP_ROAD:
00053           /* Increase the cost for level crossings */
00054           if (IsLevelCrossing(tile))
00055             cost += Yapf().PfGetSettings().road_crossing_penalty;
00056           break;
00057         case MP_STATION:
00058           if (IsDriveThroughStopTile(tile))
00059             cost += Yapf().PfGetSettings().road_stop_penalty;
00060           break;
00061 
00062         default:
00063           break;
00064       }
00065     } else {
00066       // non-diagonal trackdir
00067       cost = YAPF_TILE_CORNER_LENGTH + Yapf().PfGetSettings().road_curve_penalty;
00068     }
00069     return cost;
00070   }
00071 
00072 public:
00076   FORCEINLINE bool PfCalcCost(Node& n, const TrackFollower *tf)
00077   {
00078     int segment_cost = 0;
00079     // start at n.m_key.m_tile / n.m_key.m_td and walk to the end of segment
00080     TileIndex tile = n.m_key.m_tile;
00081     Trackdir trackdir = n.m_key.m_td;
00082     while (true) {
00083       // base tile cost depending on distance between edges
00084       segment_cost += Yapf().OneTileCost(tile, trackdir);
00085 
00086       const Vehicle *v = Yapf().GetVehicle();
00087       // we have reached the vehicle's destination - segment should end here to avoid target skipping
00088       if (Yapf().PfDetectDestinationTile(tile, trackdir)) break;
00089 
00090       // stop if we have just entered the depot
00091       if (IsRoadDepotTile(tile) && trackdir == DiagDirToDiagTrackdir(ReverseDiagDir(GetRoadDepotDirection(tile)))) {
00092         // next time we will reverse and leave the depot
00093         break;
00094       }
00095 
00096       // if there are no reachable trackdirs on new tile, we have end of road
00097       TrackFollower F(Yapf().GetVehicle());
00098       if (!F.Follow(tile, trackdir)) break;
00099 
00100       // if there are more trackdirs available & reachable, we are at the end of segment
00101       if (KillFirstBit(F.m_new_td_bits) != TRACKDIR_BIT_NONE) break;
00102 
00103       Trackdir new_td = (Trackdir)FindFirstBit2x64(F.m_new_td_bits);
00104 
00105       // stop if RV is on simple loop with no junctions
00106       if (F.m_new_tile == n.m_key.m_tile && new_td == n.m_key.m_td) return false;
00107 
00108       // if we skipped some tunnel tiles, add their cost
00109       segment_cost += F.m_tiles_skipped * YAPF_TILE_LENGTH;
00110 
00111       // add hilly terrain penalty
00112       segment_cost += Yapf().SlopeCost(tile, F.m_new_tile, trackdir);
00113 
00114       // add min/max speed penalties
00115       int min_speed = 0;
00116       int max_speed = F.GetSpeedLimit(&min_speed);
00117       if (max_speed < v->max_speed) segment_cost += 1 * (v->max_speed - max_speed);
00118       if (min_speed > v->max_speed) segment_cost += 10 * (min_speed - v->max_speed);
00119 
00120       // move to the next tile
00121       tile = F.m_new_tile;
00122       trackdir = new_td;
00123     };
00124 
00125     // save end of segment back to the node
00126     n.m_segment_last_tile = tile;
00127     n.m_segment_last_td = trackdir;
00128 
00129     // save also tile cost
00130     int parent_cost = (n.m_parent != NULL) ? n.m_parent->m_cost : 0;
00131     n.m_cost = parent_cost + segment_cost;
00132     return true;
00133   }
00134 };
00135 
00136 
00137 template <class Types>
00138 class CYapfDestinationAnyDepotRoadT
00139 {
00140 public:
00141   typedef typename Types::Tpf Tpf;                     
00142   typedef typename Types::TrackFollower TrackFollower;
00143   typedef typename Types::NodeList::Titem Node;        
00144   typedef typename Node::Key Key;                      
00145 
00147   Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00148 
00150   FORCEINLINE bool PfDetectDestination(Node& n)
00151   {
00152     bool bDest = IsRoadDepotTile(n.m_segment_last_tile);
00153     return bDest;
00154   }
00155 
00156   FORCEINLINE bool PfDetectDestinationTile(TileIndex tile, Trackdir trackdir)
00157   {
00158     return IsRoadDepotTile(tile);
00159   }
00160 
00163   FORCEINLINE bool PfCalcEstimate(Node& n)
00164   {
00165     n.m_estimate = n.m_cost;
00166     return true;
00167   }
00168 };
00169 
00170 
00171 template <class Types>
00172 class CYapfDestinationTileRoadT
00173 {
00174 public:
00175   typedef typename Types::Tpf Tpf;                     
00176   typedef typename Types::TrackFollower TrackFollower;
00177   typedef typename Types::NodeList::Titem Node;        
00178   typedef typename Node::Key Key;                      
00179 
00180 protected:
00181   TileIndex    m_destTile;
00182   TrackdirBits m_destTrackdirs;
00183 
00184 public:
00185   void SetDestination(TileIndex tile, TrackdirBits trackdirs)
00186   {
00187     m_destTile = tile;
00188     m_destTrackdirs = trackdirs;
00189   }
00190 
00191 protected:
00193   Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00194 
00195 public:
00197   FORCEINLINE bool PfDetectDestination(Node& n)
00198   {
00199     bool bDest = (n.m_segment_last_tile == m_destTile) && ((m_destTrackdirs & TrackdirToTrackdirBits(n.m_segment_last_td)) != TRACKDIR_BIT_NONE);
00200     return bDest;
00201   }
00202 
00203   FORCEINLINE bool PfDetectDestinationTile(TileIndex tile, Trackdir trackdir)
00204   {
00205     return tile == m_destTile && ((m_destTrackdirs & TrackdirToTrackdirBits(trackdir)) != TRACKDIR_BIT_NONE);
00206   }
00207 
00210   inline bool PfCalcEstimate(Node& n)
00211   {
00212     static int dg_dir_to_x_offs[] = {-1, 0, 1, 0};
00213     static int dg_dir_to_y_offs[] = {0, 1, 0, -1};
00214     if (PfDetectDestination(n)) {
00215       n.m_estimate = n.m_cost;
00216       return true;
00217     }
00218 
00219     TileIndex tile = n.m_segment_last_tile;
00220     DiagDirection exitdir = TrackdirToExitdir(n.m_segment_last_td);
00221     int x1 = 2 * TileX(tile) + dg_dir_to_x_offs[(int)exitdir];
00222     int y1 = 2 * TileY(tile) + dg_dir_to_y_offs[(int)exitdir];
00223     int x2 = 2 * TileX(m_destTile);
00224     int y2 = 2 * TileY(m_destTile);
00225     int dx = abs(x1 - x2);
00226     int dy = abs(y1 - y2);
00227     int dmin = min(dx, dy);
00228     int dxy = abs(dx - dy);
00229     int d = dmin * YAPF_TILE_CORNER_LENGTH + (dxy - 1) * (YAPF_TILE_LENGTH / 2);
00230     n.m_estimate = n.m_cost + d;
00231     assert(n.m_estimate >= n.m_parent->m_estimate);
00232     return true;
00233   }
00234 };
00235 
00236 
00237 
00238 template <class Types>
00239 class CYapfFollowRoadT
00240 {
00241 public:
00242   typedef typename Types::Tpf Tpf;                     
00243   typedef typename Types::TrackFollower TrackFollower;
00244   typedef typename Types::NodeList::Titem Node;        
00245   typedef typename Node::Key Key;                      
00246 
00247 protected:
00249   FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00250 
00251 public:
00252 
00256   inline void PfFollowNode(Node& old_node)
00257   {
00258     TrackFollower F(Yapf().GetVehicle());
00259     if (F.Follow(old_node.m_segment_last_tile, old_node.m_segment_last_td))
00260       Yapf().AddMultipleNodes(&old_node, F);
00261   }
00262 
00264   FORCEINLINE char TransportTypeChar() const {return 'r';}
00265 
00266   static Trackdir stChooseRoadTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir)
00267   {
00268     Tpf pf;
00269     return pf.ChooseRoadTrack(v, tile, enterdir);
00270   }
00271 
00272   FORCEINLINE Trackdir ChooseRoadTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir)
00273   {
00274     // handle special case - when next tile is destination tile
00275     if (tile == v->dest_tile) {
00276       // choose diagonal trackdir reachable from enterdir
00277       return DiagDirToDiagTrackdir(enterdir);
00278     }
00279     // our source tile will be the next vehicle tile (should be the given one)
00280     TileIndex src_tile = tile;
00281     // get available trackdirs on the start tile
00282     TrackdirBits src_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, v->u.road.compatible_roadtypes));
00283     // select reachable trackdirs only
00284     src_trackdirs &= DiagdirReachesTrackdirs(enterdir);
00285 
00286     // get available trackdirs on the destination tile
00287     TileIndex dest_tile = v->dest_tile;
00288     TrackdirBits dest_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(dest_tile, TRANSPORT_ROAD, v->u.road.compatible_roadtypes));
00289 
00290     // set origin and destination nodes
00291     Yapf().SetOrigin(src_tile, src_trackdirs);
00292     Yapf().SetDestination(dest_tile, dest_trackdirs);
00293 
00294     // find the best path
00295     Yapf().FindPath(v);
00296 
00297     // if path not found - return INVALID_TRACKDIR
00298     Trackdir next_trackdir = INVALID_TRACKDIR;
00299     Node *pNode = Yapf().GetBestNode();
00300     if (pNode != NULL) {
00301       // path was found or at least suggested
00302       // walk through the path back to its origin
00303       while (pNode->m_parent != NULL) {
00304         pNode = pNode->m_parent;
00305       }
00306       // return trackdir from the best origin node (one of start nodes)
00307       Node& best_next_node = *pNode;
00308       assert(best_next_node.GetTile() == tile);
00309       next_trackdir = best_next_node.GetTrackdir();
00310     }
00311     return next_trackdir;
00312   }
00313 
00314   static uint stDistanceToTile(const Vehicle *v, TileIndex tile)
00315   {
00316     Tpf pf;
00317     return pf.DistanceToTile(v, tile);
00318   }
00319 
00320   FORCEINLINE uint DistanceToTile(const Vehicle *v, TileIndex dst_tile)
00321   {
00322     // handle special case - when current tile is the destination tile
00323     if (dst_tile == v->tile) {
00324       // distance is zero in this case
00325       return 0;
00326     }
00327 
00328     if (!SetOriginFromVehiclePos(v)) return UINT_MAX;
00329 
00330     // set destination tile, trackdir
00331     //   get available trackdirs on the destination tile
00332     TrackdirBits dst_td_bits = TrackStatusToTrackdirBits(GetTileTrackStatus(dst_tile, TRANSPORT_ROAD, v->u.road.compatible_roadtypes));
00333     Yapf().SetDestination(dst_tile, dst_td_bits);
00334 
00335     // if path not found - return distance = UINT_MAX
00336     uint dist = UINT_MAX;
00337 
00338     // find the best path
00339     if (!Yapf().FindPath(v)) return dist;
00340 
00341     Node *pNode = Yapf().GetBestNode();
00342     if (pNode != NULL) {
00343       // path was found
00344       // get the path cost estimate
00345       dist = pNode->GetCostEstimate();
00346     }
00347 
00348     return dist;
00349   }
00350 
00352   FORCEINLINE bool SetOriginFromVehiclePos(const Vehicle *v)
00353   {
00354     // set origin (tile, trackdir)
00355     TileIndex src_tile = v->tile;
00356     Trackdir src_td = GetVehicleTrackdir(v);
00357     if ((TrackStatusToTrackdirBits(GetTileTrackStatus(src_tile, TRANSPORT_ROAD, v->u.road.compatible_roadtypes)) & TrackdirToTrackdirBits(src_td)) == 0) {
00358       // sometimes the roadveh is not on the road (it resides on non-existing track)
00359       // how should we handle that situation?
00360       return false;
00361     }
00362     Yapf().SetOrigin(src_tile, TrackdirToTrackdirBits(src_td));
00363     return true;
00364   }
00365 
00366   static Depot *stFindNearestDepot(const Vehicle *v, TileIndex tile, Trackdir td)
00367   {
00368     Tpf pf;
00369     return pf.FindNearestDepot(v, tile, td);
00370   }
00371 
00372   FORCEINLINE Depot *FindNearestDepot(const Vehicle *v, TileIndex tile, Trackdir td)
00373   {
00374     // set origin and destination nodes
00375     Yapf().SetOrigin(tile, TrackdirToTrackdirBits(td));
00376 
00377     // find the best path
00378     bool bFound = Yapf().FindPath(v);
00379     if (!bFound) return false;
00380 
00381     // some path found
00382     // get found depot tile
00383     Node *n = Yapf().GetBestNode();
00384     TileIndex depot_tile = n->m_segment_last_tile;
00385     assert(IsRoadDepotTile(depot_tile));
00386     Depot *ret = GetDepotByTile(depot_tile);
00387     return ret;
00388   }
00389 };
00390 
00391 template <class Tpf_, class Tnode_list, template <class Types> class Tdestination>
00392 struct CYapfRoad_TypesT
00393 {
00394   typedef CYapfRoad_TypesT<Tpf_, Tnode_list, Tdestination>  Types;
00395 
00396   typedef Tpf_                              Tpf;
00397   typedef CFollowTrackRoad                  TrackFollower;
00398   typedef Tnode_list                        NodeList;
00399   typedef CYapfBaseT<Types>                 PfBase;
00400   typedef CYapfFollowRoadT<Types>           PfFollow;
00401   typedef CYapfOriginTileT<Types>           PfOrigin;
00402   typedef Tdestination<Types>               PfDestination;
00403   typedef CYapfSegmentCostCacheNoneT<Types> PfCache;
00404   typedef CYapfCostRoadT<Types>             PfCost;
00405 };
00406 
00407 struct CYapfRoad1         : CYapfT<CYapfRoad_TypesT<CYapfRoad1        , CRoadNodeListTrackDir, CYapfDestinationTileRoadT    > > {};
00408 struct CYapfRoad2         : CYapfT<CYapfRoad_TypesT<CYapfRoad2        , CRoadNodeListExitDir , CYapfDestinationTileRoadT    > > {};
00409 
00410 struct CYapfRoadAnyDepot1 : CYapfT<CYapfRoad_TypesT<CYapfRoadAnyDepot1, CRoadNodeListTrackDir, CYapfDestinationAnyDepotRoadT> > {};
00411 struct CYapfRoadAnyDepot2 : CYapfT<CYapfRoad_TypesT<CYapfRoadAnyDepot2, CRoadNodeListExitDir , CYapfDestinationAnyDepotRoadT> > {};
00412 
00413 
00414 Trackdir YapfChooseRoadTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir)
00415 {
00416   // default is YAPF type 2
00417   typedef Trackdir (*PfnChooseRoadTrack)(const Vehicle*, TileIndex, DiagDirection);
00418   PfnChooseRoadTrack pfnChooseRoadTrack = &CYapfRoad2::stChooseRoadTrack; // default: ExitDir, allow 90-deg
00419 
00420   // check if non-default YAPF type should be used
00421   if (_settings_game.pf.yapf.disable_node_optimization) {
00422     pfnChooseRoadTrack = &CYapfRoad1::stChooseRoadTrack; // Trackdir, allow 90-deg
00423   }
00424 
00425   Trackdir td_ret = pfnChooseRoadTrack(v, tile, enterdir);
00426   return td_ret;
00427 }
00428 
00429 uint YapfRoadVehDistanceToTile(const Vehicle *v, TileIndex tile)
00430 {
00431   // default is YAPF type 2
00432   typedef uint (*PfnDistanceToTile)(const Vehicle*, TileIndex);
00433   PfnDistanceToTile pfnDistanceToTile = &CYapfRoad2::stDistanceToTile; // default: ExitDir, allow 90-deg
00434 
00435   // check if non-default YAPF type should be used
00436   if (_settings_game.pf.yapf.disable_node_optimization)
00437     pfnDistanceToTile = &CYapfRoad1::stDistanceToTile; // Trackdir, allow 90-deg
00438 
00439   // measure distance in YAPF units
00440   uint dist = pfnDistanceToTile(v, tile);
00441   // convert distance to tiles
00442   if (dist != UINT_MAX)
00443     dist = (dist + YAPF_TILE_LENGTH - 1) / YAPF_TILE_LENGTH;
00444   return dist;
00445 }
00446 
00447 Depot *YapfFindNearestRoadDepot(const Vehicle *v)
00448 {
00449   TileIndex tile = v->tile;
00450   Trackdir trackdir = GetVehicleTrackdir(v);
00451   if ((TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, v->u.road.compatible_roadtypes)) & TrackdirToTrackdirBits(trackdir)) == 0)
00452     return NULL;
00453 
00454   // handle the case when our vehicle is already in the depot tile
00455   if (IsRoadDepotTile(tile)) {
00456     // only what we need to return is the Depot*
00457     return GetDepotByTile(tile);
00458   }
00459 
00460   // default is YAPF type 2
00461   typedef Depot *(*PfnFindNearestDepot)(const Vehicle*, TileIndex, Trackdir);
00462   PfnFindNearestDepot pfnFindNearestDepot = &CYapfRoadAnyDepot2::stFindNearestDepot;
00463 
00464   // check if non-default YAPF type should be used
00465   if (_settings_game.pf.yapf.disable_node_optimization)
00466     pfnFindNearestDepot = &CYapfRoadAnyDepot1::stFindNearestDepot; // Trackdir, allow 90-deg
00467 
00468   Depot *ret = pfnFindNearestDepot(v, tile, trackdir);
00469   return ret;
00470 }

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