axmol/cocos/platform/CCGLView.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2017 Chukong Technologies Inc.

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#ifndef __CCGLVIEW_H__
#define __CCGLVIEW_H__

#include "base/ccTypes.h"
#include "base/CCEventTouch.h"

#include <vector>

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
#include <windows.h>
#endif /* (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32) */

#if (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
typedef void* id;
#endif /* (CC_TARGET_PLATFORM == CC_PLATFORM_MAC) */

/** There are some Resolution Policy for Adapt to the screen. */
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,
};

/** @struct GLContextAttrs 
 *
 * There are six opengl Context Attrs. 
 */
struct GLContextAttrs
{
    int redBits;
    int greenBits;
    int blueBits;
    int alphaBits;
    int depthBits;
    int stencilBits;
};

NS_CC_BEGIN

class Scene;
class Renderer;
class VRIRenderer;

/**
 * @addtogroup platform
 * @{
 */
/**
 * @brief By GLView you can operate the frame information of EGL view through some function.
 */
class CC_DLL GLView : public Ref
{
public:
    /**
     * @js ctor
     */
    GLView();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~GLView();

    /** Force destroying EGL view, subclass must implement this method. 
     *
     * @lua endToLua
     */
    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. 
     *
     * @param open Open or close IME keyboard.
     */
    virtual void setIMEKeyboardState(bool open) = 0;
    
    /** When the window is closed, it will return false if the platforms is Ios or Android.
     * If the platforms is windows or Mac,it will return true.
     *
     * @return In ios and android it will return false,if in windows or Mac it will return true.
     */
    virtual bool windowShouldClose() { return false; };

    /** Static method and member so that we can modify it on all platforms before create OpenGL context. 
     *
     * @param glContextAttrs The OpenGL context attrs.
     */
    static void setGLContextAttrs(GLContextAttrs& glContextAttrs);
    
    /** Return the OpenGL context attrs. 
     *
     * @return Return the OpenGL context attrs.
     */
    static GLContextAttrs getGLContextAttrs();
    
    /** The OpenGL context attrs. */
    static GLContextAttrs _glContextAttrs;

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

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

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

    /** Set zoom factor for frame. This methods are for
     * debugging big resolution (e.g.new ipad) app on desktop.
     * 
     * @param zoomFactor The zoom factor for frame.
     */
    virtual void setFrameZoomFactor(float /*zoomFactor*/) {}
    
    /** Get zoom factor for frame. This methods are for
     * debugging big resolution (e.g.new ipad) app on desktop.
     *
     * @return The zoom factor for frame.
     */
    virtual float getFrameZoomFactor() const { return 1.0; }
    
    /**
     * Hide or Show the mouse cursor if there is one.
     *
     * @param isVisible Hide or Show the mouse cursor if there is one.
     */
    virtual void setCursorVisible(bool /*isVisible*/) {}

    /** Get retina factor.
     *
     * @return The retina factor.
     */
    virtual int getRetinaFactor() const { return 1; }

    /** Only works on ios platform. Set Content Scale of the Factor. */
    virtual bool setContentScaleFactor(float /*scaleFactor*/) { return false; }
    
    /** Only works on ios platform. Get Content Scale of the Factor. */
    virtual float getContentScaleFactor() const { return 1.0; }
    
    /** Returns whether or not the view is in Retina Display mode.
     *
     * @return Returns whether or not the view is in Retina Display mode.
     */
    virtual bool isRetinaDisplay() const { return false; }
 
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    virtual void* getEAGLView() const { return nullptr; }
#endif /* (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) */

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

    /**
     * Get the visible origin point of opengl viewport.
     *
     * @return The visible origin point of opengl viewport.
     */
    virtual Vec2 getVisibleOrigin() const;

    /**
     * Get the visible rectangle of opengl viewport.
     *
     * @return 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'.
     *
     * @return The design resolution size.
     */
    virtual const Size&  getDesignResolutionSize() const;

    /**
     * Set opengl view port rectangle with points.
     *
     * @param x Set the points of x.
     * @param y Set the points of y.
     * @param w Set the width of  the view port
     * @param h Set the Height of the view port.
     */
    virtual void setViewPortInPoints(float x , float y , float w , float h);

    /**
     * Set Scissor rectangle with points.
     *
     * @param x Set the points of x.
     * @param y Set the points of y.
     * @param w Set the width of  the view port
     * @param h Set the Height of the view port.
     */
    virtual void setScissorInPoints(float x , float y , float w , float h);

    /**
     * Get whether GL_SCISSOR_TEST is enable.
     *
     * @return Whether GL_SCISSOR_TEST is enable.
     */
    virtual bool isScissorEnabled();

    /**
     * Get the current scissor rectangle.
     *
     * @return The current scissor rectangle.
     */
    virtual Rect getScissorRect() const;

    /** Set the view name. 
     *
     * @param viewname A string will be set to the view as name.
     */
    virtual void setViewName(const std::string& viewname);
    
    /** Get the view name.
     *
     * @return The view name.
     */
    const std::string& getViewName() const;

    /** Touch events are handled by default; if you want to customize your handlers, please override this function.
     *
     * @param num The number of touch.
     * @param ids The identity of the touch.
     * @param xs The points of x.
     * @param ys The points of y.
     */
    virtual void handleTouchesBegin(int num, intptr_t ids[], float xs[], float ys[]);
    
    /** Touch events are handled by default; if you want to customize your handlers, please override this function.
     *
     * @param num The number of touch.
     * @param ids The identity of the touch.
     * @param xs The points of x.
     * @param ys The points of y.
     */
    virtual void handleTouchesMove(int num, intptr_t ids[], float xs[], float ys[]);

    /** Touch events are handled by default; if you want to customize your handlers, please override this function.
     *
     * @param num The number of touch.
     * @param ids The identity of the touch.
     * @param xs The points of x.
     * @param ys The points of y.
     * @param fs The force of 3d touches.
     # @param ms The maximum force of 3d touches
     */
    virtual void handleTouchesMove(int num, intptr_t ids[], float xs[], float ys[], float fs[], float ms[]);
    
    /** Touch events are handled by default; if you want to customize your handlers, please override this function.
     *
     * @param num The number of touch.
     * @param ids The identity of the touch.
     * @param xs The points of x.
     * @param ys The points of y.
     */
    virtual void handleTouchesEnd(int num, intptr_t ids[], float xs[], float ys[]);
    
    /** Touch events are handled by default; if you want to customize your handlers, please override this function.
     *
     * @param num The number of touch.
     * @param ids The identity of the touch.
     * @param xs The points of x.
     * @param ys The points of y.
     */
    virtual void handleTouchesCancel(int num, intptr_t ids[], float xs[], float ys[]);

    /**
     * Get the opengl view port rectangle.
     *
     * @return Return the opengl view port rectangle.
     */
    const Rect& getViewPortRect() const;
    
    /**
     * Get list of all active touches.
     *
     * @return A list of all active touches.
     */
    std::vector<Touch*> getAllTouches() const;

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

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

    /** Returns the current Resolution policy.
     *
     * @return The current Resolution policy.
     */
    ResolutionPolicy getResolutionPolicy() const { return _resolutionPolicy; }

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
    virtual HWND getWin32Window() = 0;
#endif /* (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32) */

#if (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
    virtual id getCocoaWindow() = 0;
#endif /* (CC_TARGET_PLATFORM == CC_PLATFORM_MAC) */

    /**
     * Renders a Scene with a Renderer
     * This method is called directly by the Director
     */
    void renderScene(Scene* scene, Renderer* renderer);

    /**
     * Sets a VR renderer. 
     * if `vrrenderer` is `nullptr` VR will be disabled
     */
    void setVR(VRIRenderer* vrrenderer);
    VRIRenderer* getVR() const;

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;

    // VR stuff
    VRIRenderer* _vrImpl;
};

// end of platform group
/// @}

NS_CC_END

#endif /* __CCGLVIEW_H__ */