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-rw-r--r--yapf/follow_track.hpp279
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diff --git a/yapf/follow_track.hpp b/yapf/follow_track.hpp
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--- a/yapf/follow_track.hpp
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-/* $Id$ */
-
-#ifndef FOLLOW_TRACK_HPP
-#define FOLLOW_TRACK_HPP
-
-#include "yapf.hpp"
-
-/** Track follower helper template class (can serve pathfinders and vehicle
- * controllers). See 6 different typedefs below for 3 different transport
- * types w/ of w/o 90-deg turns allowed */
-template <TransportType Ttr_type_, bool T90deg_turns_allowed_ = true>
-struct CFollowTrackT : public FollowTrack_t
-{
- CPerformanceTimer* m_pPerf;
-
- FORCEINLINE CFollowTrackT(const Vehicle* v = NULL, CPerformanceTimer* pPerf = NULL)
- {
- Init(v, pPerf);
- }
-
- FORCEINLINE void Init(const Vehicle* v, CPerformanceTimer* pPerf)
- {
- assert(!IsRailTT() || (v != NULL && v->type == VEH_Train));
- m_veh = v;
- m_pPerf = pPerf;
- // don't worry, all is inlined so compiler should remove unnecessary initializations
- m_new_tile = INVALID_TILE;
- m_new_td_bits = TRACKDIR_BIT_NONE;
- m_exitdir = INVALID_DIAGDIR;
- m_is_station = m_is_bridge = m_is_tunnel = false;
- m_tiles_skipped = 0;
- }
-
- FORCEINLINE static TransportType TT() {return Ttr_type_;}
- FORCEINLINE static bool IsWaterTT() {return TT() == TRANSPORT_WATER;}
- FORCEINLINE static bool IsRailTT() {return TT() == TRANSPORT_RAIL;}
- FORCEINLINE static bool IsRoadTT() {return TT() == TRANSPORT_ROAD;}
- FORCEINLINE static bool Allow90degTurns() {return T90deg_turns_allowed_;}
-
- /** main follower routine. Fills all members and return true on success.
- * Otherwise returns false if track can't be followed. */
- FORCEINLINE bool Follow(TileIndex old_tile, Trackdir old_td)
- {
- m_old_tile = old_tile;
- m_old_td = old_td;
- assert((GetTileTrackStatus(m_old_tile, TT()) & TrackdirToTrackdirBits(m_old_td)) != 0);
- m_exitdir = TrackdirToExitdir(m_old_td);
- if (EnteredDepot()) return true;
- if (!CanExitOldTile()) return false;
- FollowTileExit();
- if (!QueryNewTileTrackStatus()) return TryReverse();
- if (!CanEnterNewTile()) return false;
- m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
- if (!Allow90degTurns())
- m_new_td_bits &= (TrackdirBits)~(int)TrackdirCrossesTrackdirs(m_old_td);
- return (m_new_td_bits != TRACKDIR_BIT_NONE);
- }
-
-protected:
- /** Follow the m_exitdir from m_old_tile and fill m_new_tile and m_tiles_skipped */
- FORCEINLINE void FollowTileExit()
- {
- m_is_station = m_is_bridge = m_is_tunnel = false;
- m_tiles_skipped = 0;
-
- // extra handling for tunnels in our direction
- if (IsTunnelTile(m_old_tile)) {
- DiagDirection tunnel_enterdir = GetTunnelDirection(m_old_tile);
- if (tunnel_enterdir == m_exitdir) {
- // we are entering the tunnel
- FindLengthOfTunnelResult flotr = FindLengthOfTunnel(m_old_tile, m_exitdir);
- m_new_tile = flotr.tile;
- m_is_tunnel = true;
- m_tiles_skipped = flotr.length - 1;
- return;
- }
- assert(ReverseDiagDir(tunnel_enterdir) == m_exitdir);
- }
-
- // extra handling for bridge ramp in our direction
- if (IsBridgeTile(m_old_tile)) {
- DiagDirection bridge_enterdir = GetBridgeRampDirection(m_old_tile);
- if (bridge_enterdir == m_exitdir) {
- // we are entering the bridge ramp
- m_new_tile = GetOtherBridgeEnd(m_old_tile);
- uint32 bridge_length = GetBridgeLength(m_old_tile, m_new_tile);
- m_tiles_skipped = bridge_length;
- m_is_bridge = true;
- return;
- }
- assert(ReverseDiagDir(bridge_enterdir) == m_exitdir);
- }
-
- // normal or station tile, do one step
- TileIndexDiff diff = TileOffsByDiagDir(m_exitdir);
- m_new_tile = TILE_ADD(m_old_tile, diff);
-
- // special handling for stations
- if (IsRailTT() && IsRailwayStationTile(m_new_tile)) {
- m_is_station = true;
- } else if (IsRoadTT() && IsRoadStopTile(m_new_tile)) {
- m_is_station = true;
- } else {
- m_is_station = false;
- }
- }
-
- /** stores track status (available trackdirs) for the new tile into m_new_td_bits */
- FORCEINLINE bool QueryNewTileTrackStatus()
- {
- CPerfStart perf(*m_pPerf);
- if (IsRailTT() && GetTileType(m_new_tile) == MP_RAILWAY && IsPlainRailTile(m_new_tile)) {
- m_new_td_bits = (TrackdirBits)(GetTrackBits(m_new_tile) * 0x101);
- } else {
- uint32 ts = GetTileTrackStatus(m_new_tile, TT());
- m_new_td_bits = (TrackdirBits)(ts & TRACKDIR_BIT_MASK);
- }
- return (m_new_td_bits != TRACKDIR_BIT_NONE);
- }
-
- /** return true if we can leave m_old_tile in m_exitdir */
- FORCEINLINE bool CanExitOldTile()
- {
- // road stop can be left at one direction only
- if (IsRoadTT() && IsRoadStopTile(m_old_tile)) {
- DiagDirection exitdir = GetRoadStopDir(m_old_tile);
- if (exitdir != m_exitdir)
- return false;
- }
-
- // road depots can be also left in one direction only
- if (IsRoadTT() && IsTileDepotType(m_old_tile, TT())) {
- DiagDirection exitdir = GetRoadDepotDirection(m_old_tile);
- if (exitdir != m_exitdir)
- return false;
- }
- return true;
- }
-
- /** return true if we can enter m_new_tile from m_exitdir */
- FORCEINLINE bool CanEnterNewTile()
- {
- if (IsRoadTT() && IsRoadStopTile(m_new_tile)) {
- // road stop can be entered from one direction only
- DiagDirection exitdir = GetRoadStopDir(m_new_tile);
- if (ReverseDiagDir(exitdir) != m_exitdir)
- return false;
- }
-
- // road and rail depots can also be entered from one direction only
- if (IsRoadTT() && IsTileDepotType(m_new_tile, TT())) {
- DiagDirection exitdir = GetRoadDepotDirection(m_new_tile);
- if (ReverseDiagDir(exitdir) != m_exitdir)
- return false;
- // don't try to enter other player's depots
- if (GetTileOwner(m_new_tile) != m_veh->owner) {
- return false;
- }
- }
- if (IsRailTT() && IsTileDepotType(m_new_tile, TT())) {
- DiagDirection exitdir = GetRailDepotDirection(m_new_tile);
- if (ReverseDiagDir(exitdir) != m_exitdir)
- return false;
- }
-
- // rail transport is possible only on tiles with the same owner as vehicle
- if (IsRailTT() && GetTileOwner(m_new_tile) != m_veh->owner) {
- // different owner
- return false;
- }
-
- // rail transport is possible only on compatible rail types
- if (IsRailTT()) {
- RailType rail_type = GetTileRailType(m_new_tile, DiagdirToDiagTrackdir(m_exitdir));
- if (((1 << rail_type) & m_veh->u.rail.compatible_railtypes) == 0) {
- // incompatible rail type
- return false;
- }
- }
-
- // tunnel holes and bridge ramps can be entered only from proper direction
- if (!IsWaterTT() && IsTileType(m_new_tile, MP_TUNNELBRIDGE)) {
- if (IsTunnel(m_new_tile)) {
- if (!m_is_tunnel) {
- DiagDirection tunnel_enterdir = GetTunnelDirection(m_new_tile);
- if (tunnel_enterdir != m_exitdir) return false;
- }
- } else if (IsBridge(m_new_tile)) {
- if (!m_is_bridge) {
- DiagDirection ramp_enderdir = GetBridgeRampDirection(m_new_tile);
- if (ramp_enderdir != m_exitdir) return false;
- }
- }
- }
-
- // special handling for rail stations - get to the end of platform
- if (IsRailTT() && m_is_station) {
- // entered railway station
- // get platform length
- uint length = GetPlatformLength(m_new_tile, TrackdirToExitdir(m_old_td));
- // how big step we must do to get to the last platform tile;
- m_tiles_skipped = length - 1;
- // move to the platform end
- TileIndexDiff diff = TileOffsByDiagDir(m_exitdir);
- diff *= m_tiles_skipped;
- m_new_tile = TILE_ADD(m_new_tile, diff);
- return true;
- }
-
- return true;
- }
-
- /** return true if we entered depot and reversed inside */
- FORCEINLINE bool EnteredDepot()
- {
- // rail and road depots cause reversing
- if (!IsWaterTT() && IsTileDepotType(m_old_tile, TT())) {
- DiagDirection exitdir = IsRailTT() ? GetRailDepotDirection(m_old_tile) : GetRoadDepotDirection(m_old_tile);
- if (exitdir != m_exitdir) {
- // reverse
- m_new_tile = m_old_tile;
- m_new_td_bits = TrackdirToTrackdirBits(ReverseTrackdir(m_old_td));
- m_exitdir = exitdir;
- m_tiles_skipped = 0;
- m_is_tunnel = m_is_bridge = m_is_station = false;
- return true;
- }
- }
- return false;
- }
-
- /** return true if we successfully reversed at end of road/track */
- FORCEINLINE bool TryReverse()
- {
- if (IsRoadTT()) {
- // if we reached the end of road, we can reverse the RV and continue moving
- m_exitdir = ReverseDiagDir(m_exitdir);
- // new tile will be the same as old one
- m_new_tile = m_old_tile;
- // set new trackdir bits to all reachable trackdirs
- QueryNewTileTrackStatus();
- m_new_td_bits &= DiagdirReachesTrackdirs(m_exitdir);
- if (m_new_td_bits != TRACKDIR_BIT_NONE) {
- // we have some trackdirs reachable after reversal
- return true;
- }
- }
- return false;
- }
-
-public:
- /** Helper for pathfinders - get min/max speed on the m_old_tile/m_old_td */
- int GetSpeedLimit(int *pmin_speed = NULL)
- {
- int min_speed = 0;
- int max_speed = INT_MAX; // no limit
-
- // for now we handle only on-bridge speed limit
- if (!IsWaterTT() && IsBridgeTile(m_old_tile)) {
- int spd = _bridge[GetBridgeType(m_old_tile)].speed;
- if (IsRoadTT()) spd *= 2;
- if (max_speed > spd) max_speed = spd;
- }
-
- // if min speed was requested, return it
- if (pmin_speed) *pmin_speed = min_speed;
- return max_speed;
- }
-};
-
-typedef CFollowTrackT<TRANSPORT_WATER, true > CFollowTrackWater;
-typedef CFollowTrackT<TRANSPORT_ROAD , true > CFollowTrackRoad;
-typedef CFollowTrackT<TRANSPORT_RAIL , true > CFollowTrackRail;
-
-typedef CFollowTrackT<TRANSPORT_WATER, false> CFollowTrackWaterNo90;
-typedef CFollowTrackT<TRANSPORT_ROAD , false> CFollowTrackRoadNo90;
-typedef CFollowTrackT<TRANSPORT_RAIL , false> CFollowTrackRailNo90;
-
-#endif /* FOLLOW_TRACK_HPP */
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