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/* $Id$ */
/** @file pbs.cpp */
#include "stdafx.h"
#include "openttd.h"
#include "pbs.h"
#include "rail_map.h"
#include "road_map.h"
#include "station_map.h"
#include "tunnelbridge_map.h"
#include "functions.h"
#include "debug.h"
#include "direction_func.h"
#include "settings_type.h"
#include "road_func.h"
#include "vehicle_base.h"
#include "yapf/follow_track.hpp"
/**
* Get the reserved trackbits for any tile, regardless of type.
* @param t the tile
* @return the reserved trackbits. TRACK_BIT_NONE on nothing reserved or
* a tile without rail.
*/
TrackBits GetReservedTrackbits(TileIndex t)
{
switch (GetTileType(t)) {
case MP_RAILWAY:
if (IsRailWaypoint(t) || IsRailDepot(t)) return GetRailWaypointReservation(t);
if (IsPlainRailTile(t)) return GetTrackReservation(t);
break;
case MP_ROAD:
if (IsLevelCrossing(t)) return GetRailCrossingReservation(t);
break;
case MP_STATION:
if (IsRailwayStation(t)) return GetRailStationReservation(t);
break;
case MP_TUNNELBRIDGE:
if (GetTunnelBridgeTransportType(t) == TRANSPORT_RAIL) return GetRailTunnelBridgeReservation(t);
break;
default:
break;
}
return TRACK_BIT_NONE;
}
/**
* Set the reservation for a complete station platform.
* @pre IsRailwayStationTile(start)
* @param start starting tile of the platform
* @param dir the direction in which to follow the platform
* @param b the state the reservation should be set to
*/
void SetRailwayStationPlatformReservation(TileIndex start, DiagDirection dir, bool b)
{
TileIndex tile = start;
TileIndexDiff diff = TileOffsByDiagDir(dir);
assert(IsRailwayStationTile(start));
assert(GetRailStationAxis(start) == DiagDirToAxis(dir));
do {
SetRailwayStationReservation(tile, b);
if (_settings_client.gui.show_track_reservation) MarkTileDirtyByTile(tile);
tile = TILE_ADD(tile, diff);
} while (IsCompatibleTrainStationTile(tile, start));
}
/**
* Try to reserve a specific track on a tile
* @param tile the tile
* @param t the track
* @return true if reservation was successfull, i.e. the track was
* free and didn't cross any other reserved tracks.
*/
bool TryReserveRailTrack(TileIndex tile, Track t)
{
assert((GetTileTrackStatus(tile, TRANSPORT_RAIL, 0) & TrackToTrackBits(t)) != 0);
if (_settings_client.gui.show_track_reservation) {
MarkTileDirtyByTile(tile);
}
switch (GetTileType(tile)) {
case MP_RAILWAY:
if (IsPlainRailTile(tile)) return TryReserveTrack(tile, t);
if (IsRailWaypoint(tile) || IsRailDepot(tile)) {
if (!GetDepotWaypointReservation(tile)) {
SetDepotWaypointReservation(tile, true);
return true;
}
}
break;
case MP_ROAD:
if (IsLevelCrossing(tile) && !GetCrossingReservation(tile)) {
SetCrossingReservation(tile, true);
return true;
}
break;
case MP_STATION:
if (IsRailwayStation(tile) && !GetRailwayStationReservation(tile)) {
SetRailwayStationReservation(tile, true);
return true;
}
break;
case MP_TUNNELBRIDGE:
if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL && !GetRailTunnelBridgeReservation(tile)) {
SetTunnelBridgeReservation(tile, true);
return true;
}
break;
default:
break;
}
return false;
}
/**
* Lift the reservation of a specific track on a tile
* @param tile the tile
* @param t the track
*/
void UnreserveRailTrack(TileIndex tile, Track t)
{
assert((GetTileTrackStatus(tile, TRANSPORT_RAIL, 0) & TrackToTrackBits(t)) != 0);
if (_settings_client.gui.show_track_reservation) {
MarkTileDirtyByTile(tile);
}
switch (GetTileType(tile)) {
case MP_RAILWAY:
if (IsRailWaypoint(tile) || IsRailDepot(tile)) SetDepotWaypointReservation(tile, false);
if (IsPlainRailTile(tile)) UnreserveTrack(tile, t);
break;
case MP_ROAD:
if (IsLevelCrossing(tile)) SetCrossingReservation(tile, false);
break;
case MP_STATION:
if (IsRailwayStation(tile)) SetRailwayStationReservation(tile, false);
break;
case MP_TUNNELBRIDGE:
if (GetTunnelBridgeTransportType(tile) == TRANSPORT_RAIL) SetTunnelBridgeReservation(tile, false);
break;
default:
break;
}
}
/**
* Follow a train reservation to the last tile.
*
* @param v the vehicle
* @returns The last tile of the reservation or the current train tile if no reservation present.
*/
PBSTileInfo FollowTrainReservation(const Vehicle *v)
{
assert(v->type == VEH_TRAIN);
TileIndex tile = v->tile;
Trackdir trackdir = GetVehicleTrackdir(v);
if (IsRailDepotTile(tile) && !GetRailDepotReservation(tile)) return PBSTileInfo(tile, trackdir, false);
/* Do not disallow 90 deg turns as the setting might have changed between reserving and now. */
CFollowTrackRail ft(v, GetRailTypeInfo(v->u.rail.railtype)->compatible_railtypes);
while (ft.Follow(tile, trackdir)) {
TrackdirBits reserved = (TrackdirBits)(ft.m_new_td_bits & (GetReservedTrackbits(ft.m_new_tile) * 0x101));
/* No reservation --> path end found */
if (reserved == TRACKDIR_BIT_NONE) break;
/* Can't have more than one reserved trackdir */
Trackdir new_trackdir = FindFirstTrackdir(reserved);
/* One-way signal against us. The reservation can't be ours as it is not
* a safe position from our direction and we can never pass the signal. */
if (HasOnewaySignalBlockingTrackdir(ft.m_new_tile, new_trackdir)) break;
tile = ft.m_new_tile;
trackdir = new_trackdir;
/* Depot tile? Can't continue. */
if (IsRailDepotTile(tile)) break;
/* Non-pbs signal? Reservation can't continue. */
if (IsTileType(tile, MP_RAILWAY) && HasSignalOnTrackdir(tile, trackdir) && !IsPbsSignal(GetSignalType(tile, TrackdirToTrack(trackdir)))) break;
}
return PBSTileInfo(tile, trackdir, IsSafeWaitingPosition(v, tile, trackdir, true, _settings_game.pf.forbid_90_deg));
}
/**
* Determine whether a certain track on a tile is a safe position to end a path.
*
* @param v the vehicle to test for
* @param tile The tile
* @param trackdir The trackdir to test
* @param include_line_end Should end-of-line tiles be considered safe?
* @param forbid_90def Don't allow trains to make 90 degree turns
* @return True if it is a safe position
*/
bool IsSafeWaitingPosition(const Vehicle *v, TileIndex tile, Trackdir trackdir, bool include_line_end, bool forbid_90deg)
{
if (IsRailDepotTile(tile)) return true;
if (IsTileType(tile, MP_RAILWAY)) {
/* For non-pbs signals, stop on the signal tile. */
if (HasSignalOnTrackdir(tile, trackdir) && !IsPbsSignal(GetSignalType(tile, TrackdirToTrack(trackdir)))) return true;
}
/* Check next tile. For perfomance reasons, we check for 90 degree turns ourself. */
CFollowTrackRail ft(v, GetRailTypeInfo(v->u.rail.railtype)->compatible_railtypes);
/* End of track? */
if (!ft.Follow(tile, trackdir)) {
/* Last tile of a terminus station is a safe position. */
if (include_line_end) return true;
}
/* Check for reachable tracks. */
ft.m_new_td_bits &= DiagdirReachesTrackdirs(ft.m_exitdir);
if (ft.m_new_td_bits == TRACKDIR_BIT_NONE) return include_line_end;
if (forbid_90deg) ft.m_new_td_bits &= ~TrackdirCrossesTrackdirs(trackdir);
if (ft.m_new_td_bits != TRACKDIR_BIT_NONE && KillFirstBit(ft.m_new_td_bits) == TRACKDIR_BIT_NONE) {
/* PBS signal on next trackdir? Safe position. */
if (HasPbsSignalOnTrackdir(ft.m_new_tile, FindFirstTrackdir(ft.m_new_td_bits))) return true;
}
return false;
}
/**
* Check if a safe position is free.
*
* @param v the vehicle to test for
* @param tile The tile
* @param trackdir The trackdir to test
* @param forbid_90def Don't allow trains to make 90 degree turns
* @return True if the position is free
*/
bool IsWaitingPositionFree(const Vehicle *v, TileIndex tile, Trackdir trackdir, bool forbid_90deg)
{
Track track = TrackdirToTrack(trackdir);
TrackBits reserved = GetReservedTrackbits(tile);
/* Tile reserved? Can never be a free waiting position. */
if (TrackOverlapsTracks(reserved, track)) return false;
/* Not reserved and depot or not a pbs signal -> free. */
if (IsRailDepotTile(tile)) return true;
if (IsTileType(tile, MP_RAILWAY) && HasSignalOnTrackdir(tile, trackdir) && !IsPbsSignal(GetSignalType(tile, track))) return true;
/* Check the next tile, if it's a PBS signal, it has to be free as well. */
CFollowTrackRail ft(v, GetRailTypeInfo(v->u.rail.railtype)->compatible_railtypes);
if (!ft.Follow(tile, trackdir)) return true;
/* Check for reachable tracks. */
ft.m_new_td_bits &= DiagdirReachesTrackdirs(ft.m_exitdir);
if (forbid_90deg) ft.m_new_td_bits &= ~TrackdirCrossesTrackdirs(trackdir);
return !HasReservedTracks(ft.m_new_tile, TrackdirBitsToTrackBits(ft.m_new_td_bits));
}
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