yapf_costrail.hpp

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00001 /* $Id: yapf_costrail.hpp 15718 2009-03-15 00:32:18Z rubidium $ */
00002 
00005 #ifndef  YAPF_COSTRAIL_HPP
00006 #define  YAPF_COSTRAIL_HPP
00007 
00008 #include "../pbs.h"
00009 
00010 template <class Types>
00011 class CYapfCostRailT
00012   : public CYapfCostBase
00013   , public CostRailSettings
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   typedef typename Node::CachedData CachedData;
00021 
00022 protected:
00023 
00024   /* Structure used inside PfCalcCost() to keep basic tile information. */
00025   struct TILE {
00026     TileIndex   tile;
00027     Trackdir    td;
00028     TileType    tile_type;
00029     RailType    rail_type;
00030 
00031     TILE()
00032     {
00033       tile = INVALID_TILE;
00034       td = INVALID_TRACKDIR;
00035       tile_type = MP_VOID;
00036       rail_type = INVALID_RAILTYPE;
00037     }
00038 
00039     TILE(TileIndex tile, Trackdir td)
00040     {
00041       this->tile = tile;
00042       this->td = td;
00043       this->tile_type = GetTileType(tile);
00044       this->rail_type = GetTileRailType(tile);
00045     }
00046 
00047     TILE(const TILE &src)
00048     {
00049       tile = src.tile;
00050       td = src.td;
00051       tile_type = src.tile_type;
00052       rail_type = src.rail_type;
00053     }
00054   };
00055 
00056 protected:
00057   int           m_max_cost;
00058   CBlobT<int>   m_sig_look_ahead_costs;
00059   bool          m_disable_cache;
00060 
00061 public:
00062   bool          m_stopped_on_first_two_way_signal;
00063 protected:
00064 
00065   static const int s_max_segment_cost = 10000;
00066 
00067   CYapfCostRailT()
00068     : m_max_cost(0)
00069     , m_disable_cache(false)
00070     , m_stopped_on_first_two_way_signal(false)
00071   {
00072     /* pre-compute look-ahead penalties into array */
00073     int p0 = Yapf().PfGetSettings().rail_look_ahead_signal_p0;
00074     int p1 = Yapf().PfGetSettings().rail_look_ahead_signal_p1;
00075     int p2 = Yapf().PfGetSettings().rail_look_ahead_signal_p2;
00076     int *pen = m_sig_look_ahead_costs.GrowSizeNC(Yapf().PfGetSettings().rail_look_ahead_max_signals);
00077     for (uint i = 0; i < Yapf().PfGetSettings().rail_look_ahead_max_signals; i++) {
00078       pen[i] = p0 + i * (p1 + i * p2);
00079     }
00080   }
00081 
00083   Tpf& Yapf()
00084   {
00085     return *static_cast<Tpf*>(this);
00086   }
00087 
00088 public:
00089   FORCEINLINE int SlopeCost(TileIndex tile, Trackdir td)
00090   {
00091     CPerfStart perf_cost(Yapf().m_perf_slope_cost);
00092     if (!stSlopeCost(tile, td)) return 0;
00093     return Yapf().PfGetSettings().rail_slope_penalty;
00094   }
00095 
00096   FORCEINLINE int CurveCost(Trackdir td1, Trackdir td2)
00097   {
00098     assert(IsValidTrackdir(td1));
00099     assert(IsValidTrackdir(td2));
00100     int cost = 0;
00101     if (TrackFollower::Allow90degTurns()
00102         && ((TrackdirToTrackdirBits(td2) & (TrackdirBits)TrackdirCrossesTrackdirs(td1)) != 0)) {
00103       /* 90-deg curve penalty */
00104       cost += Yapf().PfGetSettings().rail_curve90_penalty;
00105     } else if (td2 != NextTrackdir(td1)) {
00106       /* 45-deg curve penalty */
00107       cost += Yapf().PfGetSettings().rail_curve45_penalty;
00108     }
00109     return cost;
00110   }
00111 
00112   FORCEINLINE int SwitchCost(TileIndex tile1, TileIndex tile2, DiagDirection exitdir)
00113   {
00114     if (IsTileType(tile1, MP_RAILWAY) && IsTileType(tile2, MP_RAILWAY)) {
00115       bool t1 = KillFirstBit(GetTrackBits(tile1) & DiagdirReachesTracks(ReverseDiagDir(exitdir))) != TRACK_BIT_NONE;
00116       bool t2 = KillFirstBit(GetTrackBits(tile2) & DiagdirReachesTracks(exitdir)) != TRACK_BIT_NONE;
00117       if (t1 && t2) return Yapf().PfGetSettings().rail_doubleslip_penalty;
00118     }
00119     return 0;
00120   }
00121 
00123   FORCEINLINE int OneTileCost(TileIndex& tile, Trackdir trackdir)
00124   {
00125     int cost = 0;
00126     /* set base cost */
00127     if (IsDiagonalTrackdir(trackdir)) {
00128       cost += YAPF_TILE_LENGTH;
00129       switch (GetTileType(tile)) {
00130         case MP_ROAD:
00131           /* Increase the cost for level crossings */
00132           if (IsLevelCrossing(tile)) {
00133             cost += Yapf().PfGetSettings().rail_crossing_penalty;
00134           }
00135           break;
00136 
00137         default:
00138           break;
00139       }
00140     } else {
00141       /* non-diagonal trackdir */
00142       cost = YAPF_TILE_CORNER_LENGTH;
00143     }
00144     return cost;
00145   }
00146 
00148   FORCEINLINE bool IsAnyStationTileReserved(TileIndex tile, Trackdir trackdir, int skipped)
00149   {
00150     TileIndexDiff diff = TileOffsByDiagDir(TrackdirToExitdir(ReverseTrackdir(trackdir)));
00151     for (; skipped >= 0; skipped--, tile += diff) {
00152       if (GetRailwayStationReservation(tile)) return true;
00153     }
00154     return false;
00155   }
00156 
00158   FORCEINLINE int ReservationCost(Node& n, TileIndex tile, Trackdir trackdir, int skipped)
00159   {
00160     if (n.m_num_signals_passed >= m_sig_look_ahead_costs.Size() / 2) return 0;
00161 
00162     if (IsRailwayStationTile(tile) && IsAnyStationTileReserved(tile, trackdir, skipped)) {
00163       return Yapf().PfGetSettings().rail_pbs_station_penalty * (skipped + 1);
00164     } else if (TrackOverlapsTracks(GetReservedTrackbits(tile), TrackdirToTrack(trackdir))) {
00165       int cost = Yapf().PfGetSettings().rail_pbs_cross_penalty;
00166       if (!IsDiagonalTrackdir(trackdir)) cost = (cost * YAPF_TILE_CORNER_LENGTH) / YAPF_TILE_LENGTH;
00167       return cost * (skipped + 1);
00168     }
00169     return 0;
00170   }
00171 
00172   int SignalCost(Node& n, TileIndex tile, Trackdir trackdir)
00173   {
00174     int cost = 0;
00175     /* if there is one-way signal in the opposite direction, then it is not our way */
00176     CPerfStart perf_cost(Yapf().m_perf_other_cost);
00177     if (IsTileType(tile, MP_RAILWAY)) {
00178       bool has_signal_against = HasSignalOnTrackdir(tile, ReverseTrackdir(trackdir));
00179       bool has_signal_along = HasSignalOnTrackdir(tile, trackdir);
00180       if (has_signal_against && !has_signal_along && IsOnewaySignal(tile, TrackdirToTrack(trackdir))) {
00181         /* one-way signal in opposite direction */
00182         n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
00183       } else {
00184         if (has_signal_along) {
00185           SignalState sig_state = GetSignalStateByTrackdir(tile, trackdir);
00186           /* cache the look-ahead polynomial constant only if we didn't pass more signals than the look-ahead limit is */
00187           int look_ahead_cost = (n.m_num_signals_passed < m_sig_look_ahead_costs.Size()) ? m_sig_look_ahead_costs.Data()[n.m_num_signals_passed] : 0;
00188           if (sig_state != SIGNAL_STATE_RED) {
00189             /* green signal */
00190             n.flags_u.flags_s.m_last_signal_was_red = false;
00191             /* negative look-ahead red-signal penalties would cause problems later, so use them as positive penalties for green signal */
00192             if (look_ahead_cost < 0) {
00193               /* add its negation to the cost */
00194               cost -= look_ahead_cost;
00195             }
00196           } else {
00197             SignalType sig_type = GetSignalType(tile, TrackdirToTrack(trackdir));
00198             /* we have a red signal in our direction
00199              * was it first signal which is two-way? */
00200             if (!IsPbsSignal(sig_type) && Yapf().TreatFirstRedTwoWaySignalAsEOL() && n.flags_u.flags_s.m_choice_seen && has_signal_against && n.m_num_signals_passed == 0) {
00201               /* yes, the first signal is two-way red signal => DEAD END */
00202               n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
00203               Yapf().m_stopped_on_first_two_way_signal = true;
00204               return -1;
00205             }
00206             n.m_last_red_signal_type = sig_type;
00207             n.flags_u.flags_s.m_last_signal_was_red = true;
00208 
00209             /* look-ahead signal penalty */
00210             if (!IsPbsSignal(sig_type) && look_ahead_cost > 0) {
00211               /* add the look ahead penalty only if it is positive */
00212               cost += look_ahead_cost;
00213             }
00214 
00215             /* special signal penalties */
00216             if (n.m_num_signals_passed == 0) {
00217               switch (sig_type) {
00218                 case SIGTYPE_COMBO:
00219                 case SIGTYPE_EXIT:   cost += Yapf().PfGetSettings().rail_firstred_exit_penalty; break; // first signal is red pre-signal-exit
00220                 case SIGTYPE_NORMAL:
00221                 case SIGTYPE_ENTRY:  cost += Yapf().PfGetSettings().rail_firstred_penalty; break;
00222                 default: break;
00223               }
00224             }
00225           }
00226 
00227           n.m_num_signals_passed++;
00228           n.m_segment->m_last_signal_tile = tile;
00229           n.m_segment->m_last_signal_td = trackdir;
00230         }
00231 
00232         if (has_signal_against && IsPbsSignal(GetSignalType(tile, TrackdirToTrack(trackdir)))) {
00233           cost += n.m_num_signals_passed < Yapf().PfGetSettings().rail_look_ahead_max_signals ? Yapf().PfGetSettings().rail_pbs_signal_back_penalty : 0;
00234         }
00235       }
00236     }
00237     return cost;
00238   }
00239 
00240   FORCEINLINE int PlatformLengthPenalty(int platform_length)
00241   {
00242     int cost = 0;
00243     const Vehicle *v = Yapf().GetVehicle();
00244     assert(v != NULL);
00245     assert(v->type == VEH_TRAIN);
00246     assert(v->u.rail.cached_total_length != 0);
00247     int needed_platform_length = (v->u.rail.cached_total_length + TILE_SIZE - 1) / TILE_SIZE;
00248     if (platform_length > needed_platform_length) {
00249       /* apply penalty for longer platform than needed */
00250       cost += Yapf().PfGetSettings().rail_longer_platform_penalty;
00251     } else if (needed_platform_length > platform_length) {
00252       /* apply penalty for shorter platform than needed */
00253       cost += Yapf().PfGetSettings().rail_shorter_platform_penalty;
00254     }
00255     return cost;
00256   }
00257 
00258 public:
00259   FORCEINLINE void SetMaxCost(int max_cost)
00260   {
00261     m_max_cost = max_cost;
00262   }
00263 
00267   FORCEINLINE bool PfCalcCost(Node &n, const TrackFollower *tf)
00268   {
00269     assert(!n.flags_u.flags_s.m_targed_seen);
00270     assert(tf->m_new_tile == n.m_key.m_tile);
00271     assert((TrackdirToTrackdirBits(n.m_key.m_td) & tf->m_new_td_bits) != TRACKDIR_BIT_NONE);
00272 
00273     CPerfStart perf_cost(Yapf().m_perf_cost);
00274 
00275     /* Does the node have some parent node? */
00276     bool has_parent = (n.m_parent != NULL);
00277 
00278     /* Do we already have a cached segment? */
00279     CachedData &segment = *n.m_segment;
00280     bool is_cached_segment = (segment.m_cost >= 0);
00281 
00282     int parent_cost = has_parent ? n.m_parent->m_cost : 0;
00283 
00284     /* Each node cost contains 2 or 3 main components:
00285      *  1. Transition cost - cost of the move from previous node (tile):
00286      *    - curve cost (or zero for straight move)
00287      *  2. Tile cost:
00288      *    - base tile cost
00289      *      - YAPF_TILE_LENGTH for diagonal tiles
00290      *      - YAPF_TILE_CORNER_LENGTH for non-diagonal tiles
00291      *    - tile penalties
00292      *      - tile slope penalty (upward slopes)
00293      *      - red signal penalty
00294      *      - level crossing penalty
00295      *      - speed-limit penalty (bridges)
00296      *      - station platform penalty
00297      *      - penalty for reversing in the depot
00298      *      - etc.
00299      *  3. Extra cost (applies to the last node only)
00300      *    - last red signal penalty
00301      *    - penalty for too long or too short platform on the destination station
00302      */
00303     int transition_cost = 0;
00304     int extra_cost = 0;
00305 
00306     /* Segment: one or more tiles connected by contiguous tracks of the same type.
00307      * Each segment cost includes 'Tile cost' for all its tiles (including the first
00308      * and last), and the 'Transition cost' between its tiles. The first transition
00309      * cost of segment entry (move from the 'parent' node) is not included!
00310      */
00311     int segment_entry_cost = 0;
00312     int segment_cost = 0;
00313 
00314     const Vehicle *v = Yapf().GetVehicle();
00315 
00316     /* start at n.m_key.m_tile / n.m_key.m_td and walk to the end of segment */
00317     TILE cur(n.m_key.m_tile, n.m_key.m_td);
00318 
00319     /* the previous tile will be needed for transition cost calculations */
00320     TILE prev = !has_parent ? TILE() : TILE(n.m_parent->GetLastTile(), n.m_parent->GetLastTrackdir());
00321 
00322     EndSegmentReasonBits end_segment_reason = ESRB_NONE;
00323 
00324     TrackFollower tf_local(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);
00325 
00326     if (!has_parent) {
00327       /* We will jump to the middle of the cost calculator assuming that segment cache is not used. */
00328       assert(!is_cached_segment);
00329       /* Skip the first transition cost calculation. */
00330       goto no_entry_cost;
00331     }
00332 
00333     for (;;) {
00334       /* Transition cost (cost of the move from previous tile) */
00335       transition_cost = Yapf().CurveCost(prev.td, cur.td);
00336       transition_cost += Yapf().SwitchCost(prev.tile, cur.tile, TrackdirToExitdir(prev.td));
00337 
00338       /* First transition cost counts against segment entry cost, other transitions
00339        * inside segment will come to segment cost (and will be cached) */
00340       if (segment_cost == 0) {
00341         /* We just entered the loop. First transition cost goes to segment entry cost)*/
00342         segment_entry_cost = transition_cost;
00343         transition_cost = 0;
00344 
00345         /* It is the right time now to look if we can reuse the cached segment cost. */
00346         if (is_cached_segment) {
00347           /* Yes, we already know the segment cost. */
00348           segment_cost = segment.m_cost;
00349           /* We know also the reason why the segment ends. */
00350           end_segment_reason = segment.m_end_segment_reason;
00351           /* We will need also some information about the last signal (if it was red). */
00352           if (segment.m_last_signal_tile != INVALID_TILE) {
00353             assert(HasSignalOnTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td));
00354             SignalState sig_state = GetSignalStateByTrackdir(segment.m_last_signal_tile, segment.m_last_signal_td);
00355             bool is_red = (sig_state == SIGNAL_STATE_RED);
00356             n.flags_u.flags_s.m_last_signal_was_red = is_red;
00357             if (is_red) {
00358               n.m_last_red_signal_type = GetSignalType(segment.m_last_signal_tile, TrackdirToTrack(segment.m_last_signal_td));
00359             }
00360           }
00361           /* No further calculation needed. */
00362           cur = TILE(n.GetLastTile(), n.GetLastTrackdir());
00363           break;
00364         }
00365       } else {
00366         /* Other than first transition cost count as the regular segment cost. */
00367         segment_cost += transition_cost;
00368       }
00369 
00370 no_entry_cost: // jump here at the beginning if the node has no parent (it is the first node)
00371 
00372       /* All other tile costs will be calculated here. */
00373       segment_cost += Yapf().OneTileCost(cur.tile, cur.td);
00374 
00375       /* If we skipped some tunnel/bridge/station tiles, add their base cost */
00376       segment_cost += YAPF_TILE_LENGTH * tf->m_tiles_skipped;
00377 
00378       /* Slope cost. */
00379       segment_cost += Yapf().SlopeCost(cur.tile, cur.td);
00380 
00381       /* Reserved tiles. */
00382       segment_cost += Yapf().ReservationCost(n, cur.tile, cur.td, tf->m_tiles_skipped);
00383 
00384       /* Signal cost (routine can modify segment data). */
00385       segment_cost += Yapf().SignalCost(n, cur.tile, cur.td);
00386       end_segment_reason = segment.m_end_segment_reason;
00387 
00388       /* Tests for 'potential target' reasons to close the segment. */
00389       if (cur.tile == prev.tile) {
00390         /* Penalty for reversing in a depot. */
00391         assert(IsRailDepot(cur.tile));
00392         segment_cost += Yapf().PfGetSettings().rail_depot_reverse_penalty;
00393         /* We will end in this pass (depot is possible target) */
00394         end_segment_reason |= ESRB_DEPOT;
00395 
00396       } else if (tf->m_is_station) {
00397         /* Station penalties. */
00398         uint platform_length = tf->m_tiles_skipped + 1;
00399         /* We don't know yet if the station is our target or not. Act like
00400          * if it is pass-through station (not our destination). */
00401         segment_cost += Yapf().PfGetSettings().rail_station_penalty * platform_length;
00402         /* We will end in this pass (station is possible target) */
00403         end_segment_reason |= ESRB_STATION;
00404 
00405       } else if (cur.tile_type == MP_RAILWAY && IsRailWaypoint(cur.tile)) {
00406         /* Waypoint is also a good reason to finish. */
00407         end_segment_reason |= ESRB_WAYPOINT;
00408       } else if (TrackFollower::DoTrackMasking() && cur.tile_type == MP_RAILWAY) {
00409         /* Searching for a safe tile? */
00410         if (HasSignalOnTrackdir(cur.tile, cur.td) && !IsPbsSignal(GetSignalType(cur.tile, TrackdirToTrack(cur.td)))) {
00411           end_segment_reason |= ESRB_SAFE_TILE;
00412         }
00413       }
00414 
00415       /* Apply min/max speed penalties only when inside the look-ahead radius. Otherwise
00416        * it would cause desync in MP. */
00417       if (n.m_num_signals_passed < m_sig_look_ahead_costs.Size())
00418       {
00419         int min_speed = 0;
00420         int max_speed = tf->GetSpeedLimit(&min_speed);
00421         if (max_speed < v->max_speed) {
00422           extra_cost += YAPF_TILE_LENGTH * (v->max_speed - max_speed) * (4 + tf->m_tiles_skipped) / v->max_speed;
00423         }
00424         if (min_speed > v->max_speed) {
00425           extra_cost += YAPF_TILE_LENGTH * (min_speed - v->max_speed);
00426         }
00427       }
00428 
00429       /* Finish if we already exceeded the maximum path cost (i.e. when
00430        * searching for the nearest depot). */
00431       if (m_max_cost > 0 && (parent_cost + segment_entry_cost + segment_cost) > m_max_cost) {
00432         end_segment_reason |= ESRB_PATH_TOO_LONG;
00433       }
00434 
00435       /* Move to the next tile/trackdir. */
00436       tf = &tf_local;
00437       tf_local.Init(v, Yapf().GetCompatibleRailTypes(), &Yapf().m_perf_ts_cost);
00438 
00439       if (!tf_local.Follow(cur.tile, cur.td)) {
00440         assert(tf_local.m_err != TrackFollower::EC_NONE);
00441         /* Can't move to the next tile (EOL?). */
00442         if (tf_local.m_err == TrackFollower::EC_RAIL_TYPE) {
00443           end_segment_reason |= ESRB_RAIL_TYPE;
00444         } else {
00445           end_segment_reason |= ESRB_DEAD_END;
00446         }
00447 
00448         if (TrackFollower::DoTrackMasking() && !HasOnewaySignalBlockingTrackdir(cur.tile, cur.td)) {
00449           end_segment_reason |= ESRB_SAFE_TILE;
00450         }
00451         break;
00452       }
00453 
00454       /* Check if the next tile is not a choice. */
00455       if (KillFirstBit(tf_local.m_new_td_bits) != TRACKDIR_BIT_NONE) {
00456         /* More than one segment will follow. Close this one. */
00457         end_segment_reason |= ESRB_CHOICE_FOLLOWS;
00458         break;
00459       }
00460 
00461       /* Gather the next tile/trackdir/tile_type/rail_type. */
00462       TILE next(tf_local.m_new_tile, (Trackdir)FindFirstBit2x64(tf_local.m_new_td_bits));
00463 
00464       if (TrackFollower::DoTrackMasking() && HasPbsSignalOnTrackdir(next.tile, next.td)) {
00465         /* Possible safe tile. */
00466         end_segment_reason |= ESRB_SAFE_TILE;
00467       }
00468 
00469       /* Check the next tile for the rail type. */
00470       if (next.rail_type != cur.rail_type) {
00471         /* Segment must consist from the same rail_type tiles. */
00472         end_segment_reason |= ESRB_RAIL_TYPE;
00473         break;
00474       }
00475 
00476       /* Avoid infinite looping. */
00477       if (next.tile == n.m_key.m_tile && next.td == n.m_key.m_td) {
00478         end_segment_reason |= ESRB_INFINITE_LOOP;
00479         break;
00480       }
00481 
00482       if (segment_cost > s_max_segment_cost) {
00483         /* Potentially in the infinite loop (or only very long segment?). We should
00484          * not force it to finish prematurely unless we are on a regular tile. */
00485         if (IsTileType(tf->m_new_tile, MP_RAILWAY)) {
00486           end_segment_reason |= ESRB_SEGMENT_TOO_LONG;
00487           break;
00488         }
00489       }
00490 
00491       /* Any other reason bit set? */
00492       if (end_segment_reason != ESRB_NONE) {
00493         break;
00494       }
00495 
00496       /* For the next loop set new prev and cur tile info. */
00497       prev = cur;
00498       cur = next;
00499 
00500     } // for (;;)
00501 
00502     bool target_seen = false;
00503     if ((end_segment_reason & ESRB_POSSIBLE_TARGET) != ESRB_NONE) {
00504       /* Depot, station or waypoint. */
00505       if (Yapf().PfDetectDestination(cur.tile, cur.td)) {
00506         /* Destination found. */
00507         target_seen = true;
00508       }
00509     }
00510 
00511     /* Update the segment if needed. */
00512     if (!is_cached_segment) {
00513       /* Write back the segment information so it can be reused the next time. */
00514       segment.m_cost = segment_cost;
00515       segment.m_end_segment_reason = end_segment_reason & ESRB_CACHED_MASK;
00516       /* Save end of segment back to the node. */
00517       n.SetLastTileTrackdir(cur.tile, cur.td);
00518     }
00519 
00520     /* Do we have an excuse why not to continue pathfinding in this direction? */
00521     if (!target_seen && (end_segment_reason & ESRB_ABORT_PF_MASK) != ESRB_NONE) {
00522       /* Reason to not continue. Stop this PF branch. */
00523       return false;
00524     }
00525 
00526     /* Special costs for the case we have reached our target. */
00527     if (target_seen) {
00528       n.flags_u.flags_s.m_targed_seen = true;
00529       /* Last-red and last-red-exit penalties. */
00530       if (n.flags_u.flags_s.m_last_signal_was_red) {
00531         if (n.m_last_red_signal_type == SIGTYPE_EXIT) {
00532           /* last signal was red pre-signal-exit */
00533           extra_cost += Yapf().PfGetSettings().rail_lastred_exit_penalty;
00534         } else {
00535           /* last signal was red, but not exit */
00536           extra_cost += Yapf().PfGetSettings().rail_lastred_penalty;
00537         }
00538       }
00539 
00540       /* Station platform-length penalty. */
00541       if ((end_segment_reason & ESRB_STATION) != ESRB_NONE) {
00542         Station *st = GetStationByTile(n.GetLastTile());
00543         assert(st != NULL);
00544         uint platform_length = st->GetPlatformLength(n.GetLastTile(), ReverseDiagDir(TrackdirToExitdir(n.GetLastTrackdir())));
00545         /* Reduce the extra cost caused by passing-station penalty (each station receives it in the segment cost). */
00546         extra_cost -= Yapf().PfGetSettings().rail_station_penalty * platform_length;
00547         /* Add penalty for the inappropriate platform length. */
00548         extra_cost += PlatformLengthPenalty(platform_length);
00549       }
00550     }
00551 
00552     /* total node cost */
00553     n.m_cost = parent_cost + segment_entry_cost + segment_cost + extra_cost;
00554 
00555     return true;
00556   }
00557 
00558   FORCEINLINE bool CanUseGlobalCache(Node& n) const
00559   {
00560     return !m_disable_cache
00561       && (n.m_parent != NULL)
00562       && (n.m_parent->m_num_signals_passed >= m_sig_look_ahead_costs.Size());
00563   }
00564 
00565   FORCEINLINE void ConnectNodeToCachedData(Node& n, CachedData& ci)
00566   {
00567     n.m_segment = &ci;
00568     if (n.m_segment->m_cost < 0) {
00569       n.m_segment->m_last_tile = n.m_key.m_tile;
00570       n.m_segment->m_last_td = n.m_key.m_td;
00571     }
00572   }
00573 
00574   void DisableCache(bool disable)
00575   {
00576     m_disable_cache = disable;
00577   }
00578 };
00579 
00580 #endif /* YAPF_COSTRAIL_HPP */

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