Method opposingTrainAtSignal

src/OpenLoco/src/Vehicles/VehicleHead.cpp:4756–4803

0x004AC0A3

    // 0x004AC0A3
    bool VehicleHead::opposingTrainAtSignal()
    {
        // Works out if there is an opposing train in the tile 2 ahead (i.e. waiting at a signal)
        // The train could be on any of the multiple connections on that tile.

        const auto [nextPos, rotation] = World::Track::getTrackConnectionEnd(getTrackLoc(), trackAndDirection.track._data);
        auto tc1 = World::Track::getTrackConnections(nextPos, rotation, owner, trackType, 0, 0);
        if (tc1.connections.size() != 1)
        {
            return false;
        }

        const auto [nextNextPos, nextRotation] = World::Track::getTrackConnectionEnd(nextPos, tc1.connections.front() & Track::AdditionalTaDFlags::basicTaDMask);
        auto tc2 = World::Track::getTrackConnections(nextNextPos, nextRotation, owner, trackType, 0, 0);
        if (tc2.connections.empty())
        {
            return false;
        }

        for (auto c : tc2.connections)
        {
            TrackAndDirection::_TrackAndDirection tad{ 0, 0 };
            tad._data = c & Track::AdditionalTaDFlags::basicTaDMask;
            auto& trackSize = World::TrackData::getUnkTrack(tad._data);
            auto pos = nextNextPos + trackSize.pos;
            if (trackSize.rotationEnd < 12)
            {
                pos -= World::Pos3{ kRotationOffset[trackSize.rotationEnd], 0 };
            }

            auto reverseTad = tad;
            reverseTad.setReversed(!tad.isReversed());

            for (auto* v : VehicleManager::VehicleList())
            {
                Vehicle vehicle(v->head);
                auto* veh2 = vehicle.veh2;
                if (veh2->tileX == pos.x
                    && veh2->tileY == pos.y
                    && veh2->tileBaseZ == pos.z / World::kSmallZStep
                    && veh2->trackAndDirection.track == reverseTad)
                {
                    return true;
                }
            }
        }
        return false;
    }

    struct Sub4AC884State
    {