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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_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 (EnteredRailDepot()) return true;
if (!CanExitOldTile()) return false;
FollowTileExit();
if (!QueryNewTileTrackStatus()) return false;
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()
{
// 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);
}
// not a tunnel or station
m_is_tunnel = false;
m_tiles_skipped = 0;
// normal or station tile
TileIndexDiff diff = TileOffsByDir(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;
}
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
if (IsBridgeTile(m_new_tile)) {
if (IsBridgeMiddle(m_new_tile)) {
// bridge middle has no owner - tile is owned by the owner of the under-bridge track
if (GetBridgeAxis(m_new_tile) != DiagDirToAxis(m_exitdir)) {
// so it must be under bridge track (and wrong owner)
return false;
}
// in the middle of the bridge - when we came here, it should be ok
} else {
// different owner, on the bridge ramp
return false;
}
} else {
// different owner, not a bridge
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 tiles can be entered only from proper direction
if (!IsWaterTT() && !m_is_tunnel && IsTunnelTile(m_new_tile)) {
DiagDirection tunnel_enterdir = GetTunnelDirection(m_new_tile);
if (tunnel_enterdir != 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 = TileOffsByDir(m_exitdir);
diff *= m_tiles_skipped;
m_new_tile = TILE_ADD(m_new_tile, diff);
return true;
}
return true;
}
FORCEINLINE bool EnteredRailDepot()
{
// rail depots cause reversing
if (IsRailTT() && IsTileDepotType(m_old_tile, TT())) {
DiagDirection exitdir = GetRailDepotDirection(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 = false;
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 (IsBridgeTile(m_old_tile) && !IsWaterTT() && IsDiagonalTrackdir(m_old_td)) {
bool is_on_bridge = true;
if (IsBridgeMiddle(m_old_tile)) {
// get track axis
Axis track_axis = DiagDirToAxis(TrackdirToExitdir(m_old_td));
// get under-bridge axis
Axis bridge_axis = GetBridgeAxis(m_old_tile);
if (track_axis != bridge_axis) is_on_bridge = false;
}
if (is_on_bridge) {
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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