Function clearFunction

src/OpenLoco/src/GameCommands/Road/CreateRoad.cpp:536–605

0x00476D40

    // 0x00476D40
    static RoadClearFunctionResult clearFunction(World::TileElement& el, currency32_t& totalCost, World::TileClearance::RemovedBuildings& removedBuildings, const ClearFunctionArgs& args)
    {
        // stack
        // 0x0 = totalCost
        // 0xC = roadObjectId
        // 0xD = roadId
        // 0xE = bridge
        // 0x14 = flags
        // 0x15 = rotation
        // 0x0112C2E2 = hasLevelCrossing
        // 0x0112C2E3 = levelCrossingObjId
        // 0x0112C2EC = hasStation

        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::roadStation)
                {
                    return RoadClearFunctionResult(World::TileClearance::ClearFuncResult::noCollision);
                }
                return RoadClearFunctionResult(World::TileClearance::ClearFuncResult::collision);
            }
            case World::ElementType::signal:
                return RoadClearFunctionResult(World::TileClearance::ClearFuncResult::noCollision);
            case World::ElementType::building:
            {
                auto* elBuilding = el.as<World::BuildingElement>();
                if (elBuilding == nullptr)
                {
                    return RoadClearFunctionResult(World::TileClearance::ClearFuncResult::noCollision);
                }
                getLegacyReturnState().flags_1136073 |= (1U << 4);
                return RoadClearFunctionResult(World::TileClearance::clearBuildingCollision(*elBuilding, args.pos, removedBuildings, args.flags, totalCost));
            }
            case World::ElementType::tree:
            {
                auto* elTree = el.as<World::TreeElement>();
                if (elTree == nullptr)
                {
                    return RoadClearFunctionResult(World::TileClearance::ClearFuncResult::noCollision);
                }
                return RoadClearFunctionResult(World::TileClearance::clearTreeCollision(*elTree, args.pos, args.flags, totalCost));
            }
            case World::ElementType::road:
            {
                auto* elRoad = el.as<World::RoadElement>();
                if (elRoad != nullptr)