(svn r4987) Feature: Merged YAPF into trunk. Thanks to devs for continuous support and users for testing.
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KUDr
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yapf/follow_track.hpp
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232
yapf/follow_track.hpp
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/* $Id$ */
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#ifndef FOLLOW_TRACK_HPP
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#define FOLLOW_TRACK_HPP
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#include "yapf.hpp"
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/** Track follower helper template class (can serve pathfinders and vehicle
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controllers). See 6 different typedefs below for 3 different transport
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types w/ of w/o 90-deg turns allowed */
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template <TransportType Ttr_type_, bool T90deg_turns_allowed_ = true>
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struct CFollowTrackT : public FollowTrack_t
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{
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CPerformanceTimer* m_pPerf;
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FORCEINLINE CFollowTrackT(Vehicle* v = NULL, CPerformanceTimer* pPerf = NULL)
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{
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Init(v, pPerf);
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}
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FORCEINLINE void Init(Vehicle* v, CPerformanceTimer* pPerf)
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{
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assert(!IsRailTT() || (v != NULL && v->type == VEH_Train));
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m_veh = v;
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m_pPerf = pPerf;
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// don't worry, all is inlined so compiler should remove unnecessary initializations
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m_new_tile = INVALID_TILE;
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m_new_td_bits = TRACKDIR_BIT_NONE;
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m_exitdir = INVALID_DIAGDIR;
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m_is_tunnel = false;
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m_tunnel_tiles_skipped = 0;
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}
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FORCEINLINE static TransportType TT() {return Ttr_type_;}
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FORCEINLINE static bool IsWaterTT() {return TT() == TRANSPORT_WATER;}
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FORCEINLINE static bool IsRailTT() {return TT() == TRANSPORT_RAIL;}
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FORCEINLINE static bool IsRoadTT() {return TT() == TRANSPORT_ROAD;}
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FORCEINLINE static bool Allow90degTurns() {return T90deg_turns_allowed_;}
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/** main follower routine. Fills all members and return true on success.
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Otherwise returns false if track can't be followed. */
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FORCEINLINE bool Follow(TileIndex old_tile, Trackdir old_td)
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{
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m_old_tile = old_tile;
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m_old_td = old_td;
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assert((GetTileTrackStatus(m_old_tile, TT()) & TrackdirToTrackdirBits(m_old_td)) != 0);
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m_exitdir = TrackdirToExitdir(m_old_td);
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if (EnteredRailDepot()) return true;
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if (!CanExitOldTile()) return false;
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FollowTileExit();
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if (!QueryNewTileTrackStatus()) return false;
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if (!CanEnterNewTile()) return false;
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m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
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if (!Allow90degTurns())
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m_new_td_bits &= (TrackdirBits)~(int)TrackdirCrossesTrackdirs(m_old_td);
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return (m_new_td_bits != TRACKDIR_BIT_NONE);
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}
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protected:
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/** Follow the m_exitdir from m_old_tile and fill m_new_tile and m_tunnel_tiles_skipped */
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FORCEINLINE void FollowTileExit()
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{
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// extra handling for tunnels in our direction
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if (IsTunnelTile(m_old_tile)) {
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DiagDirection tunnel_enterdir = GetTunnelDirection(m_old_tile);
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if (tunnel_enterdir == m_exitdir) {
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// we are entering the tunnel
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FindLengthOfTunnelResult flotr = FindLengthOfTunnel(m_old_tile, m_exitdir);
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m_new_tile = flotr.tile;
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m_is_tunnel = true;
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m_tunnel_tiles_skipped = flotr.length - 1;
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return;
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}
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assert(ReverseDiagDir(tunnel_enterdir) == m_exitdir);
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}
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// not a tunnel
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m_is_tunnel = false;
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m_tunnel_tiles_skipped = 0;
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// normal tile
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TileIndexDiff diff = TileOffsByDir(m_exitdir);
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m_new_tile = TILE_ADD(m_old_tile, diff);
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}
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/** stores track status (available trackdirs) for the new tile into m_new_td_bits */
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FORCEINLINE bool QueryNewTileTrackStatus()
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{
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CPerfStart perf(*m_pPerf);
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if (GetTileType(m_new_tile) == MP_RAILWAY && IsPlainRailTile(m_new_tile)) {
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m_new_td_bits = (TrackdirBits)(GetTrackBits(m_new_tile) * 0x101);
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} else {
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uint32 ts = GetTileTrackStatus(m_new_tile, TT());
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m_new_td_bits = (TrackdirBits)(ts & TRACKDIR_BIT_MASK);
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}
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return (m_new_td_bits != TRACKDIR_BIT_NONE);
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}
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/** return true if we can leave m_old_tile in m_exitdir */
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FORCEINLINE bool CanExitOldTile()
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{
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// road stop can be left at one direction only
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if (IsRoadTT() && IsRoadStopTile(m_old_tile)) {
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DiagDirection exitdir = GetRoadStopDir(m_old_tile);
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if (exitdir != m_exitdir)
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return false;
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}
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// road depots can be also left in one direction only
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if (IsRoadTT() && IsTileDepotType(m_old_tile, TT())) {
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DiagDirection exitdir = GetRoadDepotDirection(m_old_tile);
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if (exitdir != m_exitdir)
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return false;
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}
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return true;
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}
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/** return true if we can enter m_new_tile from m_exitdir */
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FORCEINLINE bool CanEnterNewTile()
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{
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if (IsRoadTT() && IsRoadStopTile(m_new_tile)) {
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// road stop can be entered from one direction only
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DiagDirection exitdir = GetRoadStopDir(m_new_tile);
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if (ReverseDiagDir(exitdir) != m_exitdir)
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return false;
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}
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// road and rail depots can also be entered from one direction only
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if (IsRoadTT() && IsTileDepotType(m_new_tile, TT())) {
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DiagDirection exitdir = GetRoadDepotDirection(m_new_tile);
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if (ReverseDiagDir(exitdir) != m_exitdir)
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return false;
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}
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if (IsRailTT() && IsTileDepotType(m_new_tile, TT())) {
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DiagDirection exitdir = GetRailDepotDirection(m_new_tile);
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if (ReverseDiagDir(exitdir) != m_exitdir)
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return false;
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}
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// rail transport is possible only on tiles with the same owner as vehicle
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if (IsRailTT() && GetTileOwner(m_new_tile) != m_veh->owner) {
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// different owner
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if (IsBridgeTile(m_new_tile)) {
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if (IsBridgeMiddle(m_new_tile)) {
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// bridge middle has no owner - tile is owned by the owner of the under-bridge track
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if (GetBridgeAxis(m_new_tile) != DiagDirToAxis(m_exitdir)) {
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// so it must be under bridge track (and wrong owner)
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return false;
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}
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// in the middle of the bridge - when we came here, it should be ok
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} else {
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// different owner, on the bridge ramp
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return false;
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}
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} else {
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// different owner, not a bridge
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return false;
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}
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}
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// rail transport is possible only on compatible rail types
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if (IsRailTT()) {
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RailType rail_type = GetTileRailType(m_new_tile, DiagdirToDiagTrackdir(m_exitdir));
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if (((1 << rail_type) & m_veh->u.rail.compatible_railtypes) == 0) {
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// incompatible rail type
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return false;
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}
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}
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// tunnel tiles can be entered only from proper direction
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if (!IsWaterTT() && !m_is_tunnel && IsTunnelTile(m_new_tile)) {
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DiagDirection tunnel_enterdir = GetTunnelDirection(m_new_tile);
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if (tunnel_enterdir != m_exitdir)
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return false;
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}
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return true;
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}
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FORCEINLINE bool EnteredRailDepot()
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{
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// rail depots cause reversing
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if (IsRailTT() && IsTileDepotType(m_old_tile, TT())) {
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DiagDirection exitdir = GetRailDepotDirection(m_old_tile);
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if (exitdir != m_exitdir) {
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// reverse
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m_new_tile = m_old_tile;
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m_new_td_bits = TrackdirToTrackdirBits(ReverseTrackdir(m_old_td));
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m_exitdir = exitdir;
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m_tunnel_tiles_skipped = 0;
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m_is_tunnel = false;
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return true;
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}
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}
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return false;
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}
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public:
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/** Helper for pathfinders - get min/max speed on the m_old_tile/m_old_td */
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int GetSpeedLimit(int *pmin_speed = NULL)
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{
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int min_speed = 0;
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int max_speed = INT_MAX; // no limit
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// for now we handle only on-bridge speed limit
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if (IsBridgeTile(m_old_tile) && !IsWaterTT() && IsDiagonalTrackdir(m_old_td)) {
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bool is_on_bridge = true;
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if (IsBridgeMiddle(m_old_tile)) {
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// get track axis
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Axis track_axis = DiagDirToAxis(TrackdirToExitdir(m_old_td));
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// get under-bridge axis
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Axis bridge_axis = GetBridgeAxis(m_old_tile);
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if (track_axis != bridge_axis) is_on_bridge = false;
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}
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if (is_on_bridge) {
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int spd = _bridge[GetBridgeType(m_old_tile)].speed;
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if (IsRoadTT()) spd *= 2;
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if (max_speed > spd) max_speed = spd;
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}
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}
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// if min speed was requested, return it
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if (pmin_speed) *pmin_speed = min_speed;
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return max_speed;
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}
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};
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typedef CFollowTrackT<TRANSPORT_WATER, true > CFollowTrackWater;
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typedef CFollowTrackT<TRANSPORT_ROAD , true > CFollowTrackRoad;
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typedef CFollowTrackT<TRANSPORT_RAIL , true > CFollowTrackRail;
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typedef CFollowTrackT<TRANSPORT_WATER, false> CFollowTrackWaterNo90;
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typedef CFollowTrackT<TRANSPORT_ROAD , false> CFollowTrackRoadNo90;
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typedef CFollowTrackT<TRANSPORT_RAIL , false> CFollowTrackRailNo90;
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#endif /* FOLLOW_TRACK_HPP */
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