CodeRepository/Samples/Sample.GLFW.object_version/OpenGLView/OpenGLView.h

#ifndef OpenGLView_H
#define OpenGLView_H

#ifndef GLFW_EXPOSE_NATIVE_WIN32
#define GLFW_EXPOSE_NATIVE_WIN32
#endif

////
// stl
#include <memory>
#include <thread>
#include <chrono>

////
// opengl & glfw
#include <include/GL/glew.h>

#include <include/glfw3.h>
#include <include/glfw3native.h>            // GLFW_EXPOSE_NATIVE_WIN32

#define MAX_TEXTURES    32                  // texture个数(图层数)
//#define MAX_PBOS        (MAX_TEXTURES*2)    // PBO个数

/*
 * 使用OpenGL渲染视频，主要用到纹理、PBO、窗口及事件管理
 */

/*
 * OpenGLRender封装纹理及PBO
 */
enum    eGL_ImageFormat
{
    eGL_ImageFormat_Grey    = 1,
    eGL_ImageFormat_RGB     = 3,
    eGL_ImageFormat_RGBA    = 4,
};

class OpenGLRender
{
private:
    class   Texture
    {
    public:
        Texture();
        virtual ~Texture();

        void    Create(int nCount);
        void    Destroy();

        bool    Init(int nIndex, eGL_ImageFormat eImageFmt, int nImageWidth, int nImageHeight);
        bool    DrawImage(int nIndex, eGL_ImageFormat eImageFmt, char* pImageData, int nImageWidth, int nImageHeight);
        int     GetCount();

    protected:
        GLuint  m_nTextures[MAX_TEXTURES];

        int     m_nCount;
        int     m_nCurrentIndex;

        bool    m_bCreate;
        bool    m_bInit;
    };

private:
    class   PBOTexture
    {
    public:
        PBOTexture();
        virtual ~PBOTexture();

        void    Create(int nCount);
        void    Destroy();

        bool    Init(int nIndex, eGL_ImageFormat eImageFmt, int nImageWidth, int nImageHeight);
        bool    DrawImage(int nIndex, eGL_ImageFormat eImageFmt, char* pImageData, int nImageWidth, int nImageHeight);
        int     GetCount();

    protected:
        GLuint  m_nTextures[MAX_TEXTURES];
        GLuint  m_nPBOs[2];

        int     m_nCount;
        int     m_nCurrentIndex;

        bool    m_bCreate;
        bool    m_bInit;

        uint32_t    m_nPBOIndex_Now;
        uint32_t    m_nPBOIndex_Next;
    };

public:
    OpenGLRender();
    virtual ~OpenGLRender();

    bool    Init(eGL_ImageFormat eImageFmt, int nImageWidth, int nImageHeight);
    void    Uninit();

    bool    DrawImage(char* pImageData, int nImageWidth, int nImageHeight);

protected:
    std::shared_ptr<Texture>        m_ptrTexture;
    std::shared_ptr<PBOTexture>     m_ptrPBOTexture;

    bool    m_bInit;
    eGL_ImageFormat     m_eImageFmt;
    int     m_nImageWidth;
    int     m_nImageHeight;
};


/*
 * OpenGLView为完整的对外OpenGL窗口/视图累
 * 使用OpenGLRender
 * 使用GLFW进行窗口及事件管理
 */
class   OpenGLView
{
public:
    OpenGLView();
    virtual ~OpenGLView();

    bool    Init(eGL_ImageFormat eImageFmt, int nImageWidth, int nImageHeight);
    void    Uninit();

    bool    GetWndHandle(uint32_t& hWnd);

    bool    DrawImage(char* pImageData, int nImageWidth, int nImageHeight);

    bool    GlfwShouldClose();

    void    UpdateGL();

private:
    bool    InitGLFW(int nWndWidth, int nWndHeight);
    void    UninitGLFW();

    void    OnWindowSize(int nWidth, int nHeight);

    static  void    OnErrorCallback(int error, const char* description);
    static  void    OnWindowSizeCallback(GLFWwindow* pWindow, int nWidth, int nHeight);

private:
    //
    bool    m_bInit;
    std::shared_ptr<OpenGLRender>   m_ptrOpenGLRender;

    //
    bool    m_bInitGLFW;
    GLFWwindow* m_pGLFWWindow;

    uint8_t m_nDrawCount;
};

#endif // OpenGLView_H