Function findSignalOnTrack

src/OpenLoco/src/Vehicles/Routing.cpp:197–240

    constexpr auto kNullTransformFunction = [](const RoutingResults&) {};

    static std::optional<std::pair<World::SignalElement*, World::TrackElement*>> findSignalOnTrack(const World::Pos3& signalLoc, const TrackAndDirection::_TrackAndDirection trackAndDirection, const uint8_t trackType, const uint8_t index)
    {
        auto tile = World::TileManager::get(signalLoc);
        for (auto& el : tile)
        {
            if (el.baseZ() != signalLoc.z / 4)
            {
                continue;
            }

            auto* elTrack = el.as<TrackElement>();
            if (elTrack == nullptr)
            {
                continue;
            }

            if (!elTrack->hasSignal())
            {
                continue;
            }

            if (elTrack->rotation() != trackAndDirection.cardinalDirection())
            {
                continue;
            }

            if (elTrack->sequenceIndex() != index)
            {
                continue;
            }

            if (elTrack->trackObjectId() != trackType)
            {
                continue;
            }

            if (elTrack->trackId() != trackAndDirection.id())
            {
                continue;
            }
            return std::make_pair(elTrack->next()->as<SignalElement>(), elTrack);
        }
        return std::nullopt;
    }

    // 0x0048963F but only when flags are 0xXXXX_XXXA
    SignalStateFlags getSignalState(const World::Pos3& loc, const TrackAndDirection::_TrackAndDirection trackAndDirection, const uint8_t trackType, uint32_t flags)