初始化glew，创建OpenGL渲染上下文

void RegisterWinDowClass(HINSTANCE hInstance,std::string className,WNDPROC proc)
{
    WNDCLASS wndClass;
    wndClass.cbClsExtra = 0;
    wndClass.cbWndExtra = 0;
    wndClass.hbrBackground = (HBRUSH)::GetStockObject(GRAY_BRUSH);
    wndClass.hCursor = ::LoadCursor(NULL,IDC_ARROW);
    wndClass.hIcon = ::LoadIcon(NULL,IDI_APPLICATION);
    wndClass.hInstance = hInstance;
    wndClass.lpfnWndProc = proc;
    wndClass.lpszClassName = className.c_str();
    wndClass.lpszMenuName = NULL;
    wndClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC | CS_DBLCLKS;
    ::RegisterClass(&wndClass);
}

bool InitGlewLib(HINSTANCE hInstance)
{
    RegisterWinDowClass(hInstance,"Fake",MainWinProc);

    HWND hWnd = ::CreateWindow("Fake","OpenGL",WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,CW_USEDEFAULT,width,heigtht,
        NULL,NULL,hInstance,NULL);

    HDC hDC = ::GetDC(hWnd);
    HGLRC hRc;
    ::PIXELFORMATDESCRIPTOR pfd;
    //memset(&pfd,0,sizeof(pfd));

    //pfd.nVersion = 1;
    //pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
    //pfd.dwFlags = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
    //pfd.iPixelType = PFD_TYPE_RGBA;
    //pfd.cColorBits = 32;
    //pfd.cDepthBits = 32;
    //pfd.iLayerType = PFD_MAIN_PLANE;       

    //int iPixelFormat = ::ChoosePixelFormat(hDC,&pfd);
    //if (iPixelFormat == 0)
    //{
    //    DestroyWindow(hWnd);
    //    return false;
    //}
    /**************************************************************************
    
    1，注册fake窗口的class，如果和主窗口是同名的class，会使初始化失败
    2，选择1号格式索引作为临时索引
    3，根据设备上下文创建渲染上下文
    4，绑定到当前上下文
    5，初始化glew
    6，解除上下文绑定，销毁窗口
    **************************************************************************/

    int iPixelFormat = 1;
    if (::SetPixelFormat(hDC,iPixelFormat,&pfd))
    {
        hRc = ::wglCreateContext(hDC);
        if (::wglMakeCurrent(hDC,hRc))
        {
            GLenum retVal = glewInit();
            wglMakeCurrent(NULL,NULL);
            wglDeleteContext(hRc);
            DestroyWindow(hWnd);
            return retVal == GLEW_OK;
        }
        wglDeleteContext(hRc);
        DestroyWindow(hWnd);
    }
    else
    {
        DestroyWindow(hWnd);
    }
    
    return false;
}

bool InitOpenGL(HWND hWnd,HINSTANCE hInstance)
{
    if (!InitGlewLib(hInstance))
    {
        ::MessageBox(NULL,"glew init Error",NULL,MB_OK);
        return 0;
    }

    if(!WGLEW_ARB_create_context || !WGLEW_ARB_pixel_format)
        return false;
    HDC hDC = ::GetDC(hWnd);
    PIXELFORMATDESCRIPTOR pfd;
    //memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
    //pfd.nSize        = sizeof(PIXELFORMATDESCRIPTOR);
    //pfd.nVersion   = 1;
    //pfd.dwFlags    = PFD_DOUBLEBUFFER | PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW;
    //pfd.iPixelType = PFD_TYPE_RGBA;
    //pfd.cColorBits = 32;
    //pfd.cDepthBits = 32;
    //pfd.iLayerType = PFD_MAIN_PLANE;

    /**************************************************************************
    
    1，填充像素格式属性 （缓冲区的初始化）
    2，填充上下文属性 （用于设置指定OpenGL版本）
    3，根据像素格式属性选择设备上下文合适像素格式索引。wglChoosePixelFormatARB(...)
    4，将得到的像素格式索引绑定到设备上下文。SetPixelFormat(...)
    5，根据设备上下文，及上下文属性设置创建一个OpenGL渲染上下文。wglCreateContextAttribsARB(...)
    6，将渲染上下文与设备上下文绑定 wglMakeCurrent(...)
     
    **************************************************************************/
 
    const int iPixelFormatAttributeList[] =
    {
        WGL_DRAW_TO_WINDOW_ARB, GL_TRUE,                        // 绘制到窗口
        WGL_SUPPORT_OPENGL_ARB,GL_TRUE,                            // 支持OpenGL
        WGL_ACCELERATION_ARB ,WGL_FULL_ACCELERATION_ARB ,        // 硬件加速
        WGL_DOUBLE_BUFFER_ARB,GL_TRUE,                            // 双缓冲
        WGL_PIXEL_TYPE_ARB,WGL_TYPE_RGBA_ARB,                    // RGBA
        WGL_COLOR_BITS_ARB,32,                                    // 颜色位数32
        WGL_DEPTH_BITS_ARB,24,                                    // 深度位数24
        WGL_STENCIL_BITS_ARB,8,                                    // 模板位数8
        WGL_SWAP_METHOD_ARB, WGL_SWAP_EXCHANGE_ARB,                // 双缓冲swap方式直接交换
        WGL_SAMPLES_ARB, 4,                                // 4倍抗锯齿
        0
    };

    const int iContextAttributeList[] =
    {
        WGL_CONTEXT_MAJOR_VERSION_ARB,3,                        // 主版本号
        WGL_CONTEXT_MINOR_VERSION_ARB,3,                        // 次版本号
        WGL_CONTEXT_FLAGS_ARB,WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
        0
    };

    int iPixelFormat,iNumFormat;
    wglChoosePixelFormatARB(hDC,iPixelFormatAttributeList,NULL,
        1,&iPixelFormat,(UINT *)&iNumFormat);

    if (!SetPixelFormat(hDC,iPixelFormat,&pfd))
    {
        //int error = ::GetLastError();
        return false;
    }
    HGLRC hRC = wglCreateContextAttribsARB(hDC,NULL,iContextAttributeList);
    if (hRC) 
    {
        ::wglMakeCurrent(hDC,hRC);
        return true;
    }
    return false;
}