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Unreserve and re-reserve reservations to bidi bridge/tunnel entrances when reversing train inside

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This commit is contained in:
Jonathan G Rennison
2019-08-18 17:05:44 +01:00
parent dae041601d
commit d0ee897135
1 changed files with 30 additions and 0 deletions
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30
src/train_cmd.cpp
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@@ -2176,6 +2176,32 @@ void ReverseTrainDirection(Train *v)
/* Clear path reservation in front if train is not stuck. */
if (!HasBit(v->flags, VRF_TRAIN_STUCK)) FreeTrainTrackReservation(v);
std::vector<Train *> re_reserve_trains;
{
/* Temporarily clear and restore reservations to bidi tunnel/bridge entrances when reversing train inside,
* to avoid outgoing and incoming reservations becoming merged */
auto find_train_reservations = [&re_reserve_trains, &v](TileIndex tile) {
TrackBits reserved = GetAcrossTunnelBridgeReservationTrackBits(tile);
Track track;
while ((track = RemoveFirstTrack(&reserved)) != INVALID_TRACK) {
Train *res_train = GetTrainForReservation(tile, track);
if (res_train != nullptr && res_train != v) {
FreeTrainTrackReservation(res_train);
re_reserve_trains.push_back(res_train);
}
}
};
if (IsTunnelBridgeWithSignalSimulation(v->tile) && IsTunnelBridgeSignalSimulationBidirectional(v->tile)) {
find_train_reservations(v->tile);
find_train_reservations(GetOtherTunnelBridgeEnd(v->tile));
}
Train *last = v->Last();
if (IsTunnelBridgeWithSignalSimulation(last->tile) && IsTunnelBridgeSignalSimulationBidirectional(last->tile)) {
find_train_reservations(last->tile);
find_train_reservations(GetOtherTunnelBridgeEnd(last->tile));
}
}
if ((v->track & TRACK_BIT_WORMHOLE) && IsTunnelBridgeWithSignalSimulation(v->tile)) {
/* Clear exit tile reservation if train was on approach to exit and had reserved it */
Axis axis = DiagDirToAxis(GetTunnelBridgeDirection(v->tile));
@@ -2236,6 +2262,10 @@ void ReverseTrainDirection(Train *v)
crossing = TrainApproachingCrossingTile(v);
if (crossing != INVALID_TILE) MaybeBarCrossingWithSound(crossing);
for (uint i = 0; i < re_reserve_trains.size(); ++i) {
TryPathReserve(re_reserve_trains[i], true);
}
/* If we are inside a depot after reversing, don't bother with path reserving. */
if (v->track == TRACK_BIT_DEPOT) {
/* Can't be stuck here as inside a depot is always a safe tile. */