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-rw-r--r--src/pbs.cpp96
1 files changed, 79 insertions, 17 deletions
diff --git a/src/pbs.cpp b/src/pbs.cpp
index 71a9689a0..12e54d7f4 100644
--- a/src/pbs.cpp
+++ b/src/pbs.cpp
@@ -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"
/**
@@ -159,23 +160,12 @@ bool TryReserveRailTrack(TileIndex tile, Track t)
}
}
-/**
- * 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);
+/** 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(v, GetRailTypeInfo(v->u.rail.railtype)->compatible_railtypes);
+ CFollowTrackRail ft(o, rts);
while (ft.Follow(tile, trackdir)) {
TrackdirBits reserved = (TrackdirBits)(ft.m_new_td_bits & (GetReservedTrackbits(ft.m_new_tile) * 0x101));
@@ -187,7 +177,7 @@ PBSTileInfo FollowTrainReservation(const Vehicle *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;
+ if (!ignore_oneway && HasOnewaySignalBlockingTrackdir(ft.m_new_tile, new_trackdir)) break;
tile = ft.m_new_tile;
trackdir = new_trackdir;
@@ -198,7 +188,79 @@ PBSTileInfo FollowTrainReservation(const Vehicle *v)
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));
+ return PBSTileInfo(tile, trackdir, false);
+}
+
+/**
+ * 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);
+
+ 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;
+}
+
+/** Callback for VehicleFromPos to find a train on a specific track. */
+static Vehicle *FindTrainOnTrackEnum(Vehicle *v, void *data)
+{
+ PBSTileInfo info = *(PBSTileInfo *)data;
+
+ if (v->type == VEH_TRAIN && !(v->vehstatus & VS_CRASHED) && HasBit((TrackBits)v->u.rail.track, TrackdirToTrack(info.trackdir))) return v;
+
+ return NULL;
+}
+
+/**
+ * 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);
+
+ 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 NULL;
}
/**