4jcraft/Minecraft.World/Blocks/BaseRailTile.h

#pragma once
#include "Tile.h"
#include "../Level/TilePos.h"
#include "../Util/Definitions.h"

class Random;
class HitResult;
class ChunkRebuildData;

class BaseRailTile : public Tile {
    friend class Tile;
    friend class ChunkRebuildData;

public:
    static const int DIR_FLAT_Z = 0;
    static const int DIR_FLAT_X = 1;
    // the data bit is used by boosters and detectors, so they can't turn
    static const int RAIL_DATA_BIT = 8;
    static const int RAIL_DIRECTION_MASK = 7;

private:
    Icon* iconTurn;

protected:
    bool usesDataBit;

    class Rail {
        friend class BaseRailTile;
        friend class RailTile;

    private:
        Level* level;
        int x, y, z;
        bool usesDataBit;
        std::vector<TilePos*> connections;
        bool m_bValidRail;  // 4J added

    public:
        Rail(Level* level, int x, int y, int z);
        ~Rail();

    private:
        void updateConnections(int direction);
        void removeSoftConnections();
        bool hasRail(int x, int y, int z);
        Rail* getRail(TilePos* p);
        bool connectsTo(Rail* rail);
        bool hasConnection(int x, int y, int z);

    protected:
        int countPotentialConnections();

    private:
        bool canConnectTo(Rail* rail);
        void connectTo(Rail* rail);
        bool hasNeighborRail(int x, int y, int z);

    public:
        void place(bool hasSignal, bool first);
    };

public:
    static bool isRail(Level* level, int x, int y, int z);
    static bool isRail(int id);

protected:
    BaseRailTile(int id, bool usesDataBit);

public:
    using Tile::getResourceCount;

    bool isUsesDataBit();
    virtual std::optional<AABB> getAABB(Level* level, int x, int y, int z);
    virtual bool blocksLight();
    virtual bool isSolidRender(bool isServerLevel = false);
    virtual HitResult* clip(Level* level, int xt, int yt, int zt, Vec3* a,
                            Vec3* b);
    virtual void updateShape(
        LevelSource* level, int x, int y, int z, int forceData = -1,
        std::shared_ptr<TileEntity> forceEntity = std::shared_ptr<
            TileEntity>());  // 4J added forceData, forceEntity param
    virtual bool isCubeShaped();
    virtual int getRenderShape();
    virtual int getResourceCount(Random random);
    virtual bool mayPlace(Level* level, int x, int y, int z);
    virtual void onPlace(Level* level, int x, int y, int z);
    virtual void neighborChanged(Level* level, int x, int y, int z, int type);

protected:
    virtual void updateState(Level* level, int x, int y, int z, int data,
                             int dir, int type);
    virtual void updateDir(Level* level, int x, int y, int z, bool first);

public:
    int getPistonPushReaction();
    void onRemove(Level* level, int x, int y, int z, int id, int data);
};