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(svn r13956) -Add [YAPP]: Function for getting the train holding a reserved path. (michi_cc)

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rubidium 2008-08-02 22:54:53 +00:00
parent bd0a420744
commit bce6f7b41c
2 changed files with 82 additions and 18 deletions
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98
src/pbs.cpp
View File

@ -14,6 +14,7 @@
#include "settings_type.h"
#include "road_func.h"
#include "vehicle_base.h"
#include "vehicle_func.h"
#include "yapf/follow_track.hpp"
/**
@ -159,6 +160,37 @@ bool TryReserveRailTrack(TileIndex tile, Track t)
}
}
/** Follow a reservation starting from a specific tile to the end. */
static PBSTileInfo FollowReservation(Owner o, RailTypes rts, TileIndex tile, Trackdir trackdir, bool ignore_oneway = false)
{
/* Do not disallow 90 deg turns as the setting might have changed between reserving and now. */
CFollowTrackRail ft(o, rts);
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 (!ignore_oneway && 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, false);
}
/**
* Follow a train reservation to the last tile.
*
@ -174,31 +206,61 @@ PBSTileInfo FollowTrainReservation(const Vehicle *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));
PBSTileInfo res = FollowReservation(v->owner, GetRailTypeInfo(v->u.rail.railtype)->compatible_railtypes, tile, trackdir);
res.okay = IsSafeWaitingPosition(v, res.tile, res.trackdir, true, _settings_game.pf.forbid_90_deg);
return res;
}
/* No reservation --> path end found */
if (reserved == TRACKDIR_BIT_NONE) break;
/** Callback for VehicleFromPos to find a train on a specific track. */
static Vehicle *FindTrainOnTrackEnum(Vehicle *v, void *data)
{
PBSTileInfo info = *(PBSTileInfo *)data;
/* Can't have more than one reserved trackdir */
Trackdir new_trackdir = FindFirstTrackdir(reserved);
if (v->type == VEH_TRAIN && !(v->vehstatus & VS_CRASHED) && HasBit((TrackBits)v->u.rail.track, TrackdirToTrack(info.trackdir))) return v;
/* 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;
return NULL;
}
tile = ft.m_new_tile;
trackdir = new_trackdir;
/**
* Find the train which has reserved a specific path.
*
* @param tile A tile on the path.
* @param track A reserved track on the tile.
* @return The vehicle holding the reservation or NULL if the path is stray.
*/
Vehicle *GetTrainForReservation(TileIndex tile, Track track)
{
assert(HasReservedTracks(tile, TrackToTrackBits(track)));
Trackdir trackdir = TrackToTrackdir(track);
/* 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;
RailTypes rts = GetRailTypeInfo(GetTileRailType(tile))->compatible_railtypes;
/* Follow the path from tile to both ends, one of the end tiles should
* have a train on it. We need FollowReservation to ignore one-way signals
* here, as one of the two search directions will be the "wrong" way. */
for (int i = 0; i < 2; ++i, trackdir = ReverseTrackdir(trackdir)) {
PBSTileInfo dest = FollowReservation(GetTileOwner(tile), rts, tile, trackdir, true);
Vehicle *v = VehicleFromPos(dest.tile, &dest, FindTrainOnTrackEnum);
if (v != NULL) return v->First();
/* Special case for stations: check the whole platform for a vehicle. */
if (IsRailwayStationTile(dest.tile)) {
TileIndexDiff diff = TileOffsByDiagDir(TrackdirToExitdir(ReverseTrackdir(dest.trackdir)));
for (TileIndex st_tile = dest.tile + diff; IsCompatibleTrainStationTile(st_tile, dest.tile); st_tile += diff) {
v = VehicleFromPos(st_tile, &dest, FindTrainOnTrackEnum);
if (v != NULL) return v->First();
}
}
/* Special case for bridges/tunnels: check the other end as well. */
if (IsTileType(dest.tile, MP_TUNNELBRIDGE)) {
v = VehicleFromPos(GetOtherTunnelBridgeEnd(dest.tile), &dest, FindTrainOnTrackEnum);
if (v != NULL) return v->First();
}
}
return PBSTileInfo(tile, trackdir, IsSafeWaitingPosition(v, tile, trackdir, true, _settings_game.pf.forbid_90_deg));
return NULL;
}
/**

2
src/pbs.h
View File

@ -31,6 +31,8 @@ PBSTileInfo FollowTrainReservation(const Vehicle *v);
bool IsSafeWaitingPosition(const Vehicle *v, TileIndex tile, Trackdir trackdir, bool include_line_end, bool forbid_90deg = false);
bool IsWaitingPositionFree(const Vehicle *v, TileIndex tile, Trackdir trackdir, bool forbid_90deg = false);
Vehicle *GetTrainForReservation(TileIndex tile, Track track);
/**
* Check whether some of tracks is reserved on a tile.
*