yapf_ship.cpp

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00001 /* $Id: yapf_ship.cpp 15903 2009-03-30 23:15:05Z rubidium $ */
00002 
00005 #include "../stdafx.h"
00006 
00007 #include "yapf.hpp"
00008 
00010 template <class Types>
00011 class CYapfFollowShipT
00012 {
00013 public:
00014   typedef typename Types::Tpf Tpf;                     
00015   typedef typename Types::TrackFollower TrackFollower;
00016   typedef typename Types::NodeList::Titem Node;        
00017   typedef typename Node::Key Key;                      
00018 
00019 protected:
00021   FORCEINLINE Tpf& Yapf()
00022   {
00023     return *static_cast<Tpf*>(this);
00024   }
00025 
00026 public:
00030   inline void PfFollowNode(Node& old_node)
00031   {
00032     TrackFollower F(Yapf().GetVehicle());
00033     if (F.Follow(old_node.m_key.m_tile, old_node.m_key.m_td)) {
00034       Yapf().AddMultipleNodes(&old_node, F);
00035     }
00036   }
00037 
00039   FORCEINLINE char TransportTypeChar() const
00040   {
00041     return 'w';
00042   }
00043 
00044   static Trackdir ChooseShipTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks)
00045   {
00046     /* handle special case - when next tile is destination tile */
00047     if (tile == v->dest_tile) {
00048       /* convert tracks to trackdirs */
00049       TrackdirBits trackdirs = (TrackdirBits)(tracks | ((int)tracks << 8));
00050       /* choose any trackdir reachable from enterdir */
00051       trackdirs &= DiagdirReachesTrackdirs(enterdir);
00052       return (Trackdir)FindFirstBit2x64(trackdirs);
00053     }
00054 
00055     /* move back to the old tile/trackdir (where ship is coming from) */
00056     TileIndex src_tile = TILE_ADD(tile, TileOffsByDiagDir(ReverseDiagDir(enterdir)));
00057     Trackdir trackdir = GetVehicleTrackdir(v);
00058     assert(IsValidTrackdir(trackdir));
00059 
00060     /* convert origin trackdir to TrackdirBits */
00061     TrackdirBits trackdirs = TrackdirToTrackdirBits(trackdir);
00062     /* get available trackdirs on the destination tile */
00063     TrackdirBits dest_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(v->dest_tile, TRANSPORT_WATER, 0));
00064 
00065     /* create pathfinder instance */
00066     Tpf pf;
00067     /* set origin and destination nodes */
00068     pf.SetOrigin(src_tile, trackdirs);
00069     pf.SetDestination(v->dest_tile, dest_trackdirs);
00070     /* find best path */
00071     pf.FindPath(v);
00072 
00073     Trackdir next_trackdir = INVALID_TRACKDIR; // this would mean "path not found"
00074 
00075     Node *pNode = pf.GetBestNode();
00076     if (pNode != NULL) {
00077       /* walk through the path back to the origin */
00078       Node *pPrevNode = NULL;
00079       while (pNode->m_parent != NULL) {
00080         pPrevNode = pNode;
00081         pNode = pNode->m_parent;
00082       }
00083       /* return trackdir from the best next node (direct child of origin) */
00084       Node& best_next_node = *pPrevNode;
00085       assert(best_next_node.GetTile() == tile);
00086       next_trackdir = best_next_node.GetTrackdir();
00087     }
00088     return next_trackdir;
00089   }
00090 };
00091 
00093 template <class Types>
00094 class CYapfCostShipT
00095 {
00096 public:
00097   typedef typename Types::Tpf Tpf;              
00098   typedef typename Types::TrackFollower TrackFollower;
00099   typedef typename Types::NodeList::Titem Node; 
00100   typedef typename Node::Key Key;               
00101 
00102 protected:
00104   Tpf& Yapf()
00105   {
00106     return *static_cast<Tpf*>(this);
00107   }
00108 
00109 public:
00113   FORCEINLINE bool PfCalcCost(Node& n, const TrackFollower *tf)
00114   {
00115     /* base tile cost depending on distance */
00116     int c = IsDiagonalTrackdir(n.GetTrackdir()) ? YAPF_TILE_LENGTH : YAPF_TILE_CORNER_LENGTH;
00117     /* additional penalty for curves */
00118     if (n.m_parent != NULL && n.GetTrackdir() != NextTrackdir(n.m_parent->GetTrackdir())) {
00119       /* new trackdir does not match the next one when going straight */
00120       c += YAPF_TILE_LENGTH;
00121     }
00122 
00123     c += YAPF_TILE_LENGTH * tf->m_tiles_skipped;
00124 
00125     /* apply it */
00126     n.m_cost = n.m_parent->m_cost + c;
00127     return true;
00128   }
00129 };
00130 
00134 template <class Tpf_, class Ttrack_follower, class Tnode_list>
00135 struct CYapfShip_TypesT
00136 {
00138   typedef CYapfShip_TypesT<Tpf_, Ttrack_follower, Tnode_list>  Types;
00139 
00141   typedef Tpf_                              Tpf;
00143   typedef Ttrack_follower                   TrackFollower;
00145   typedef Tnode_list                        NodeList;
00147   typedef CYapfBaseT<Types>                 PfBase;        // base pathfinder class
00148   typedef CYapfFollowShipT<Types>           PfFollow;      // node follower
00149   typedef CYapfOriginTileT<Types>           PfOrigin;      // origin provider
00150   typedef CYapfDestinationTileT<Types>      PfDestination; // destination/distance provider
00151   typedef CYapfSegmentCostCacheNoneT<Types> PfCache;       // segment cost cache provider
00152   typedef CYapfCostShipT<Types>             PfCost;        // cost provider
00153 };
00154 
00155 /* YAPF type 1 - uses TileIndex/Trackdir as Node key, allows 90-deg turns */
00156 struct CYapfShip1 : CYapfT<CYapfShip_TypesT<CYapfShip1, CFollowTrackWater    , CShipNodeListTrackDir> > {};
00157 /* YAPF type 2 - uses TileIndex/DiagDirection as Node key, allows 90-deg turns */
00158 struct CYapfShip2 : CYapfT<CYapfShip_TypesT<CYapfShip2, CFollowTrackWater    , CShipNodeListExitDir > > {};
00159 /* YAPF type 3 - uses TileIndex/Trackdir as Node key, forbids 90-deg turns */
00160 struct CYapfShip3 : CYapfT<CYapfShip_TypesT<CYapfShip3, CFollowTrackWaterNo90, CShipNodeListTrackDir> > {};
00161 
00163 Trackdir YapfChooseShipTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks)
00164 {
00165   /* default is YAPF type 2 */
00166   typedef Trackdir (*PfnChooseShipTrack)(const Vehicle*, TileIndex, DiagDirection, TrackBits);
00167   PfnChooseShipTrack pfnChooseShipTrack = CYapfShip2::ChooseShipTrack; // default: ExitDir, allow 90-deg
00168 
00169   /* check if non-default YAPF type needed */
00170   if (_settings_game.pf.forbid_90_deg) {
00171     pfnChooseShipTrack = &CYapfShip3::ChooseShipTrack; // Trackdir, forbid 90-deg
00172   } else if (_settings_game.pf.yapf.disable_node_optimization) {
00173     pfnChooseShipTrack = &CYapfShip1::ChooseShipTrack; // Trackdir, allow 90-deg
00174   }
00175 
00176   Trackdir td_ret = pfnChooseShipTrack(v, tile, enterdir, tracks);
00177   return td_ret;
00178 }
00179 
00181 void *NpfBeginInterval()
00182 {
00183   CPerformanceTimer& perf = *new CPerformanceTimer;
00184   perf.Start();
00185   return &perf;
00186 }
00187 
00189 int NpfEndInterval(void *vperf)
00190 {
00191   CPerformanceTimer& perf = *(CPerformanceTimer*)vperf;
00192   perf.Stop();
00193   int t = perf.Get(1000000);
00194   delete &perf;
00195   return t;
00196 }

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