Function clearFunction

src/OpenLoco/src/GameCommands/Track/CreateTrack.cpp:270–333

0x0049C275

    // 0x0049C275
    static World::TileClearance::ClearFuncResult clearFunction(
        World::TileElement& el,
        currency32_t& totalCost,
        bool& hasLevelCrossing,
        World::TileClearance::RemovedBuildings& removedBuildings,
        const ClearFunctionArgs& args)
    {
        switch (el.type())
        {
            case World::ElementType::track:
            {
                auto* elTrack = el.as<World::TrackElement>();
                if (elTrack != nullptr)
                {
                    return clearTrack(*elTrack, args);
                }
                break;
            }
            case World::ElementType::station:
            {
                auto* elStation = el.as<World::StationElement>();
                if (elStation->stationType() == StationType::trainStation)
                {
                    return World::TileClearance::ClearFuncResult::noCollision;
                }
                return World::TileClearance::ClearFuncResult::collision;
            }
            case World::ElementType::signal:
                return World::TileClearance::ClearFuncResult::noCollision;
            case World::ElementType::building:
            {
                auto* elBuilding = el.as<World::BuildingElement>();
                if (elBuilding == nullptr)
                {
                    return World::TileClearance::ClearFuncResult::noCollision;
                }
                getLegacyReturnState().flags_1136073 |= (1U << 4);
                return World::TileClearance::clearBuildingCollision(*elBuilding, args.pos, removedBuildings, args.flags, totalCost);
            }
            case World::ElementType::tree:
            {
                auto* elTree = el.as<World::TreeElement>();
                if (elTree == nullptr)
                {
                    return World::TileClearance::ClearFuncResult::noCollision;
                }
                return World::TileClearance::clearTreeCollision(*elTree, args.pos, args.flags, totalCost);
            }
            case World::ElementType::road:
            {
                auto* elRoad = el.as<World::RoadElement>();
                if (elRoad != nullptr)
                {
                    return clearRoad(*elRoad, args, hasLevelCrossing);
                }
                break;
            }
            case World::ElementType::surface: