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(svn r13983) -Fix (r13953) [YAPP]: Crashed trains can be on different trackbits. Make sure there is still a track reservation when one vehicle is cleaned up.

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This commit is contained in:
frosch 2008-08-03 19:04:11 +00:00
parent 1f4b89ff4b
commit 628723d45c
1 changed files with 34 additions and 9 deletions
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43
src/train_cmd.cpp
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@ -3834,6 +3834,20 @@ reverse_train_direction:
ReverseTrainDirection(v);
}
/** Collect trackbits of all crashed train vehicles on a tile
* @param v Vehicle passed from VehicleFromPos()
* @param data trackdirbits for the result
* @return NULL to not abort VehicleFromPos()
*/
static Vehicle *CollectTrackbitsFromCrashedVehiclesEnum(Vehicle *v, void *data)
{
TrackBits *trackbits = (TrackBits *)data;
if (v->type == VEH_TRAIN && (v->vehstatus & VS_CRASHED) != 0) *trackbits |= v->u.rail.track;
return NULL;
}
/**
* Deletes/Clears the last wagon of a crashed train. It takes the engine of the
* train, then goes to the last wagon and deletes that. Each call to this function
@ -3870,19 +3884,30 @@ static void DeleteLastWagon(Vehicle *v)
MarkSingleVehicleDirty(v);
/* Clear a possible path reservation */
if ((IsFrontEngine(v) && !(v->u.rail.track & TRACK_BIT_DEPOT))
|| ((v->u.rail.track & ~TRACK_BIT_MASK) == TRACK_BIT_NONE && (v->tile != u->tile || (u->u.rail.track & ~TRACK_BIT_MASK) != TRACK_BIT_NONE))) {
if (HasReservedTracks(v->tile, v->u.rail.track)) UnreserveRailTrack(v->tile, TrackBitsToTrack(v->u.rail.track));
}
/* 'v' shouldn't be accessed after it has been deleted */
TrackBits track = v->u.rail.track;
TrackBits trackbits = v->u.rail.track;
Track track = TrackBitsToTrack(trackbits);
TileIndex tile = v->tile;
Owner owner = v->owner;
delete v;
v = NULL; // make sure nobody will won't try to read 'v' anymore
v = NULL; // make sure nobody will try to read 'v' anymore
if (HasReservedTracks(tile, trackbits)) {
UnreserveRailTrack(tile, track);
/* If there are still crashed vehicles on the tile, give the track reservation to them */
TrackBits remaining_trackbits = TRACK_BIT_NONE;
VehicleFromPos(tile, &remaining_trackbits, CollectTrackbitsFromCrashedVehiclesEnum);
/* It is important that these two are the first in the loop, as reservation cannot deal with every trackbit combination */
assert(TRACK_BEGIN == TRACK_X && TRACK_Y == TRACK_BEGIN + 1);
for (Track t = TRACK_BEGIN; t < TRACK_END; t++) {
if (HasBit(remaining_trackbits, t)) {
TryReserveRailTrack(tile, t);
}
}
}
/* check if the wagon was on a road/rail-crossing */
if (IsLevelCrossingTile(tile)) UpdateLevelCrossing(tile);
@ -3891,7 +3916,7 @@ static void DeleteLastWagon(Vehicle *v)
if (IsTileType(tile, MP_TUNNELBRIDGE) || IsRailDepotTile(tile)) {
UpdateSignalsOnSegment(tile, INVALID_DIAGDIR, owner);
} else {
SetSignalsOnBothDir(tile, (Track)(FIND_FIRST_BIT(track)), owner);
SetSignalsOnBothDir(tile, track, owner);
}
}