axmol/cocos/2d/platform/CCGLViewProtocol.h

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Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2014 Chukong Technologies Inc.

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#ifndef __CCGLVIEWPROTOCOL_H__
#define __CCGLVIEWPROTOCOL_H__

#include "ccTypes.h"
#include "CCEventTouch.h"

#include <vector>

enum class ResolutionPolicy
{
    // The entire application is visible in the specified area without trying to preserve the original aspect ratio.
    // Distortion can occur, and the application may appear stretched or compressed.
    EXACT_FIT,
    // The entire application fills the specified area, without distortion but possibly with some cropping,
    // while maintaining the original aspect ratio of the application.
    NO_BORDER,
    // The entire application is visible in the specified area without distortion while maintaining the original
    // aspect ratio of the application. Borders can appear on two sides of the application.
    SHOW_ALL,
    // The application takes the height of the design resolution size and modifies the width of the internal
    // canvas so that it fits the aspect ratio of the device
    // no distortion will occur however you must make sure your application works on different
    // aspect ratios
    FIXED_HEIGHT,
    // The application takes the width of the design resolution size and modifies the height of the internal
    // canvas so that it fits the aspect ratio of the device
    // no distortion will occur however you must make sure your application works on different
    // aspect ratios
    FIXED_WIDTH,

    UNKNOWN,
};

NS_CC_BEGIN

/**
 * @addtogroup platform
 * @{
 */

class CC_DLL GLViewProtocol
{
public:
    /**
     * @js ctor
     */
    GLViewProtocol();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~GLViewProtocol();

    /** Force destroying EGL view, subclass must implement this method. */
    virtual void end() = 0;

    /** Get whether opengl render system is ready, subclass must implement this method. */
    virtual bool isOpenGLReady() = 0;

    /** Exchanges the front and back buffers, subclass must implement this method. */
    virtual void swapBuffers() = 0;

    /** Open or close IME keyboard , subclass must implement this method. */
    virtual void setIMEKeyboardState(bool open) = 0;

    /**
     * Polls input events. Subclass must implement methods if platform
     * does not provide event callbacks.
     */
    virtual void pollInputEvents();

    /**
     * Get the frame size of EGL view.
     * In general, it returns the screen size since the EGL view is a fullscreen view.
     */
    virtual const Size& getFrameSize() const;

    /**
     * Set the frame size of EGL view.
     */
    virtual void setFrameSize(float width, float height);

    /**
     * Get the visible area size of opengl viewport.
     */
    virtual Size getVisibleSize() const;

    /**
     * Get the visible origin point of opengl viewport.
     */
    virtual Vector2 getVisibleOrigin() const;

    /**
     * Get the visible rectangle of opengl viewport.
     */
    virtual Rect getVisibleRect() const;

    /**
     * Set the design resolution size.
     * @param width Design resolution width.
     * @param height Design resolution height.
     * @param resolutionPolicy The resolution policy desired, you may choose:
     *                         [1] EXACT_FIT Fill screen by stretch-to-fit: if the design resolution ratio of width to height is different from the screen resolution ratio, your game view will be stretched.
     *                         [2] NO_BORDER Full screen without black border: if the design resolution ratio of width to height is different from the screen resolution ratio, two areas of your game view will be cut.
     *                         [3] SHOW_ALL  Full screen with black border: if the design resolution ratio of width to height is different from the screen resolution ratio, two black borders will be shown.
     */
    virtual void setDesignResolutionSize(float width, float height, ResolutionPolicy resolutionPolicy);

    /** Get design resolution size.
     *  Default resolution size is the same as 'getFrameSize'.
     */
    virtual const Size&  getDesignResolutionSize() const;

    /**
     * Set opengl view port rectangle with points.
     */
    virtual void setViewPortInPoints(float x , float y , float w , float h);

    /**
     * Set Scissor rectangle with points.
     */
    virtual void setScissorInPoints(float x , float y , float w , float h);

    /**
     * Get whether GL_SCISSOR_TEST is enable
     */
    virtual bool isScissorEnabled();

    /**
     * Get the current scissor rectangle
     */
    virtual Rect getScissorRect() const;

    virtual void setViewName(const std::string& viewname);
    const std::string& getViewName() const;

    /** Touch events are handled by default; if you want to customize your handlers, please override these functions: */
    virtual void handleTouchesBegin(int num, intptr_t ids[], float xs[], float ys[]);
    virtual void handleTouchesMove(int num, intptr_t ids[], float xs[], float ys[]);
    virtual void handleTouchesEnd(int num, intptr_t ids[], float xs[], float ys[]);
    virtual void handleTouchesCancel(int num, intptr_t ids[], float xs[], float ys[]);

    /**
     * Get the opengl view port rectangle.
     */
    const Rect& getViewPortRect() const;

    /**
     * Get scale factor of the horizontal direction.
     */
    float getScaleX() const;

    /**
     * Get scale factor of the vertical direction.
     */
    float getScaleY() const;

    /** returns the current Resolution policy */
    ResolutionPolicy getResolutionPolicy() const { return _resolutionPolicy; }

protected:
    void updateDesignResolutionSize();
    
    void handleTouchesOfEndOrCancel(EventTouch::EventCode eventCode, int num, intptr_t ids[], float xs[], float ys[]);

    // real screen size
    Size _screenSize;
    // resolution size, it is the size appropriate for the app resources.
    Size _designResolutionSize;
    // the view port size
    Rect _viewPortRect;
    // the view name
    std::string _viewName;

    float _scaleX;
    float _scaleY;
    ResolutionPolicy _resolutionPolicy;
};

// end of platform group
/// @}

NS_CC_END

#endif /* __CCGLVIEWPROTOCOL_H__ */