yapf_ship.cpp

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00001 /* $Id: yapf_ship.cpp 14949 2009-01-10 00:31:47Z 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() {return *static_cast<Tpf*>(this);}
00022 
00023 public:
00027   inline void PfFollowNode(Node& old_node)
00028   {
00029     TrackFollower F(Yapf().GetVehicle());
00030     if (F.Follow(old_node.m_key.m_tile, old_node.m_key.m_td))
00031       Yapf().AddMultipleNodes(&old_node, F);
00032   }
00033 
00035   FORCEINLINE char TransportTypeChar() const {return 'w';}
00036 
00037   static Trackdir ChooseShipTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks)
00038   {
00039     // handle special case - when next tile is destination tile
00040     if (tile == v->dest_tile) {
00041       // convert tracks to trackdirs
00042       TrackdirBits trackdirs = (TrackdirBits)(tracks | ((int)tracks << 8));
00043       // choose any trackdir reachable from enterdir
00044       trackdirs &= DiagdirReachesTrackdirs(enterdir);
00045       return (Trackdir)FindFirstBit2x64(trackdirs);
00046     }
00047 
00048     // move back to the old tile/trackdir (where ship is coming from)
00049     TileIndex src_tile = TILE_ADD(tile, TileOffsByDiagDir(ReverseDiagDir(enterdir)));
00050     Trackdir trackdir = GetVehicleTrackdir(v);
00051     assert(IsValidTrackdir(trackdir));
00052 
00053     // convert origin trackdir to TrackdirBits
00054     TrackdirBits trackdirs = TrackdirToTrackdirBits(trackdir);
00055     // get available trackdirs on the destination tile
00056     TrackdirBits dest_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(v->dest_tile, TRANSPORT_WATER, 0));
00057 
00058     // create pathfinder instance
00059     Tpf pf;
00060     // set origin and destination nodes
00061     pf.SetOrigin(src_tile, trackdirs);
00062     pf.SetDestination(v->dest_tile, dest_trackdirs);
00063     // find best path
00064     pf.FindPath(v);
00065 
00066     Trackdir next_trackdir = INVALID_TRACKDIR; // this would mean "path not found"
00067 
00068     Node *pNode = pf.GetBestNode();
00069     if (pNode != NULL) {
00070       // walk through the path back to the origin
00071       Node *pPrevNode = NULL;
00072       while (pNode->m_parent != NULL) {
00073         pPrevNode = pNode;
00074         pNode = pNode->m_parent;
00075       }
00076       // return trackdir from the best next node (direct child of origin)
00077       Node& best_next_node = *pPrevNode;
00078       assert(best_next_node.GetTile() == tile);
00079       next_trackdir = best_next_node.GetTrackdir();
00080     }
00081     return next_trackdir;
00082   }
00083 };
00084 
00086 template <class Types>
00087 class CYapfCostShipT
00088 {
00089 public:
00090   typedef typename Types::Tpf Tpf;              
00091   typedef typename Types::TrackFollower TrackFollower;
00092   typedef typename Types::NodeList::Titem Node; 
00093   typedef typename Node::Key Key;               
00094 
00095 protected:
00097   Tpf& Yapf() {return *static_cast<Tpf*>(this);}
00098 
00099 public:
00103   FORCEINLINE bool PfCalcCost(Node& n, const TrackFollower *tf)
00104   {
00105     // base tile cost depending on distance
00106     int c = IsDiagonalTrackdir(n.GetTrackdir()) ? 10 : 7;
00107     // additional penalty for curves
00108     if (n.m_parent != NULL && n.GetTrackdir() != NextTrackdir(n.m_parent->GetTrackdir())) {
00109       /* new trackdir does not match the next one when going straight */
00110       c += 10;
00111     }
00112 
00113     c += YAPF_TILE_LENGTH * tf->m_tiles_skipped;
00114 
00115     // apply it
00116     n.m_cost = n.m_parent->m_cost + c;
00117     return true;
00118   }
00119 };
00120 
00124 template <class Tpf_, class Ttrack_follower, class Tnode_list>
00125 struct CYapfShip_TypesT
00126 {
00128   typedef CYapfShip_TypesT<Tpf_, Ttrack_follower, Tnode_list>  Types;
00129 
00131   typedef Tpf_                              Tpf;
00133   typedef Ttrack_follower                   TrackFollower;
00135   typedef Tnode_list                        NodeList;
00137   typedef CYapfBaseT<Types>                 PfBase;        // base pathfinder class
00138   typedef CYapfFollowShipT<Types>           PfFollow;      // node follower
00139   typedef CYapfOriginTileT<Types>           PfOrigin;      // origin provider
00140   typedef CYapfDestinationTileT<Types>      PfDestination; // destination/distance provider
00141   typedef CYapfSegmentCostCacheNoneT<Types> PfCache;       // segment cost cache provider
00142   typedef CYapfCostShipT<Types>             PfCost;        // cost provider
00143 };
00144 
00145 // YAPF type 1 - uses TileIndex/Trackdir as Node key, allows 90-deg turns
00146 struct CYapfShip1 : CYapfT<CYapfShip_TypesT<CYapfShip1, CFollowTrackWater    , CShipNodeListTrackDir> > {};
00147 // YAPF type 2 - uses TileIndex/DiagDirection as Node key, allows 90-deg turns
00148 struct CYapfShip2 : CYapfT<CYapfShip_TypesT<CYapfShip2, CFollowTrackWater    , CShipNodeListExitDir > > {};
00149 // YAPF type 3 - uses TileIndex/Trackdir as Node key, forbids 90-deg turns
00150 struct CYapfShip3 : CYapfT<CYapfShip_TypesT<CYapfShip3, CFollowTrackWaterNo90, CShipNodeListTrackDir> > {};
00151 
00153 Trackdir YapfChooseShipTrack(const Vehicle *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks)
00154 {
00155   // default is YAPF type 2
00156   typedef Trackdir (*PfnChooseShipTrack)(const Vehicle*, TileIndex, DiagDirection, TrackBits);
00157   PfnChooseShipTrack pfnChooseShipTrack = CYapfShip2::ChooseShipTrack; // default: ExitDir, allow 90-deg
00158 
00159   // check if non-default YAPF type needed
00160   if (_settings_game.pf.forbid_90_deg) {
00161     pfnChooseShipTrack = &CYapfShip3::ChooseShipTrack; // Trackdir, forbid 90-deg
00162   } else if (_settings_game.pf.yapf.disable_node_optimization) {
00163     pfnChooseShipTrack = &CYapfShip1::ChooseShipTrack; // Trackdir, allow 90-deg
00164   }
00165 
00166   Trackdir td_ret = pfnChooseShipTrack(v, tile, enterdir, tracks);
00167   return td_ret;
00168 }
00169 
00171 void * NpfBeginInterval()
00172 {
00173   CPerformanceTimer& perf = *new CPerformanceTimer;
00174   perf.Start();
00175   return &perf;
00176 }
00177 
00179 int NpfEndInterval(void *vperf)
00180 {
00181   CPerformanceTimer& perf = *(CPerformanceTimer*)vperf;
00182   perf.Stop();
00183   int t = perf.Get(1000000);
00184   delete &perf;
00185   return t;
00186 }

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