Cocos2d-x结构学习（五）CCEGLViewProtocol、CCEGLView

1、CCEGLViewProtocol：Cocos2d-x和openGL间的接口，桥梁

class CC_DLL CCEGLViewProtocol
{
public:
    CCEGLViewProtocol();
    virtual ~CCEGLViewProtocol();

    virtual void    end() = 0;         //销毁，子类必须继承

    virtual bool    isOpenGLReady() = 0;  //获得GL渲染系统是否已经准备好

    virtual void    swapBuffers() = 0;  //缓冲区交换

    virtual void    setIMEKeyboardState(bool bOpen) = 0;    //设置输入法状态

    virtual const CCSize& getFrameSize() const;                //窗体大小
    virtual void setFrameSize(float width,float height);

    virtual CCSize getVisibleSize() const;                      //openGL视口可见区域
    virtual CCPoint getVisibleOrigin() const;

    virtual void setDesignResolutionSize(float width,float height,ResolutionPolicy resolutionPolicy);

    virtual void setTouchDelegate(EGLTouchDelegate * pDelegate);   //设置触摸委派

    virtual void setViewPortInPoints(float x,float y,float w,float h);   //设置openGL视口矩形

    virtual void setScissorInPoints(float x,float h);    //设置裁剪矩形

    virtual bool isScissorEnabled();                   //裁剪相关
    virtual CCRect getScissorRect();
  
    virtual void setViewName(const char* pszViewName);    //视窗名字
    const char* getViewName();

    virtual void handleTouchesBegin(int num,int ids[],float xs[],float ys[]);         //触摸事件处理
    virtual void handleTouchesMove(int num,float ys[]);
    virtual void handleTouchesEnd(int num,float ys[]);
    virtual void handleTouchesCancel(int num,float ys[]);

    const CCRect& getViewPortRect() const;             //获取openGL视口矩形

    float getScaleX() const;                     //获得缩放因子
    float getScaleY() const;
private:
    void getSetOfTouchesEndOrCancel(CCSet& set,int num,float ys[]);

protected:
    EGLTouchDelegate* m_pDelegate;
    CCSize m_obScreenSize;
    CCSize m_obDesignResolutionSize;
    CCRect m_obViewPortRect;
    char   m_szViewName[50];

    float  m_fScaleX;
    float  m_fScaleY;
    ResolutionPolicy m_eResolutionPolicy;
};

class CC_DLL CCEGLView : public CCEGLViewProtocol
{
public:
    CCEGLView();
    virtual ~CCEGLView();

    virtual bool isOpenGLReady();           //以下6个均为重载函数
    virtual void end();
    virtual void swapBuffers();
    virtual void setFrameSize(float width,float height);
	virtual void setEditorFrameSize(float width,HWND hWnd); 
    virtual void setIMEKeyboardState(bool bOpen);

    void setMenuResource(LPCWSTR menu);                  //设置菜单资源
    void setWndProc(CUSTOM_WND_PROC proc);                //设置消息处理函数

protected:
    virtual bool Create();
public:
    bool initGL();               //初始化openGL
    void destroyGL();           //销毁openGL

    virtual LRESULT WindowProc(UINT message,WPARAM wParam,LPARAM lParam);   //消息处理函数

    HWND getHWnd();                                 //Win32平台，窗体句柄
    virtual void resize(int width,int height);
	
    void setFrameZoomFactor(float fZoomFactor);
    float getFrameZoomFactor();
    virtual void centerWindow();

    typedef void (*LPFN_ACCELEROMETER_KEYHOOK)( UINT message,LPARAM lParam );
    void setAccelerometerKeyHook( LPFN_ACCELEROMETER_KEYHOOK lpfnAccelerometerKeyHook );

    virtual void setViewPortInPoints(float x,float h);
    virtual void setScissorInPoints(float x,float h);
    
    static CCEGLView* sharedOpenGLView();                //获得实例句柄

protected:
    static CCEGLView* s_pEglView;
    bool m_bCaptured;
    HWND m_hWnd;
    HDC  m_hDC;
    HGLRC m_hRC;
    LPFN_ACCELEROMETER_KEYHOOK m_lpfnAccelerometerKeyHook;
    bool m_bSupportTouch;

    LPCWSTR m_menu;
    CUSTOM_WND_PROC m_wndproc;

    float m_fFrameZoomFactor;
};

typedef LRESULT (*CUSTOM_WND_PROC)(UINT message,LPARAM lParam,BOOL* pProcessed);

（编辑：李大同）

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