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Fix #9669, cbe00ec: Only try valid reverse directions (#9672)

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This commit is contained in:
Loïc Guilloux
2021-11-06 17:32:37 +01:00
committed by GitHub
parent 33ef34189e
commit 6ff0858b38
2 changed files with 12 additions and 3 deletions
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7
src/pathfinder/npf/npf.cpp
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@@ -1225,9 +1225,12 @@ bool NPFShipCheckReverse(const Ship *v, Trackdir *best_td)
AyStarUserData user = { v->owner, TRANSPORT_WATER, RAILTYPES_NONE, ROADTYPES_NONE, 0 };
if (best_td != nullptr) {
TrackdirBits rtds = DiagdirReachesTrackdirs(ReverseDiagDir(VehicleExitDir(v->direction, v->state)));
DiagDirection entry = ReverseDiagDir(VehicleExitDir(v->direction, v->state));
TrackdirBits rtds = DiagdirReachesTrackdirs(entry) & TrackStatusToTrackdirBits(GetTileTrackStatus(v->tile, TRANSPORT_WATER, 0, entry));
Trackdir best = (Trackdir)FindFirstBit2x64(rtds);
for (rtds = KillFirstBit(rtds); rtds != TRACKDIR_BIT_NONE; rtds = KillFirstBit(rtds)) {
rtds = KillFirstBit(rtds);
if (rtds == TRACKDIR_BIT_NONE) return false; /* At most one choice. */
for (; rtds != TRACKDIR_BIT_NONE; rtds = KillFirstBit(rtds)) {
Trackdir td = (Trackdir)FindFirstBit2x64(rtds);
ftd = NPFRouteToStationOrTileTwoWay(v->tile, best, false, v->tile, td, false, &fstd, &user);
if (ftd.best_bird_dist == 0 && NPFGetFlag(&ftd.node, NPF_FLAG_REVERSE)) best = td;