1、基于MFC的OpenGL程序

HGLRC m_hRC;    //RC 绘图上下文
CDC* m_pDC;        //DC 设备上下文
BOOL InitializeOpenGL();    //初始化 OpenGL
BOOL SetupPixelFormat();    //为 DC 建立像素格式

int CopenGLMFCView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CView::OnCreate(lpCreateStruct) == -1)
        return -1;

    // TODO:  Add your specialized creation code here
    InitializeOpenGL();
    return 0;
}

BOOL CopenGLMFCView::InitializeOpenGL()
{
    //客户区获得DC
    m_pDC = new CClientDC(this);
    //Failure to Get DC
    if (m_pDC == NULL)
    {
        MessageBox(L"Error Obtaining DC");
        return FALSE;
    }
    //为DC建立像素格式
    if (!SetupPixelFormat())
    {
        return FALSE;
    }
    //创建 RC
    m_hRC = ::wglCreateContext(m_pDC->GetSafeHdc());
    //Failure to Create Rendering Context
    if (m_hRC == 0)
    {
        MessageBox(L"Error Creating RC");
        return FALSE;
    }
    //设定OpenGL当前线程的渲染环境。
    //以后这个线程所有的OpenGL调用都是在这个hdc标识的设备上绘制。
    if (::wglMakeCurrent(m_pDC->GetSafeHdc(), m_hRC) == FALSE)
    {
        MessageBox(L"Error making RC Current");
        return FALSE;
    }
    //背景颜色
    ::glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    //深度缓存 1最大，让任何都能显示出来
    ::glClearDepth(1.0f);
    //如果通过比较后深度值发生变化了，会进行更新深度缓冲区的操作
    ::glEnable(GL_DEPTH_TEST);
    return TRUE;
}
//建立像素格式
/////////////////////////////////////////////////////////////////////////////
BOOL CopenGLMFCView::SetupPixelFormat()
{
    static PIXELFORMATDESCRIPTOR pfd =
    {
        sizeof(PIXELFORMATDESCRIPTOR),  // size of this pfd
        1,                              // version number
        PFD_DRAW_TO_WINDOW |            // support window
        PFD_SUPPORT_OPENGL |            // support OpenGL
        PFD_DOUBLEBUFFER,                // double buffered
        PFD_TYPE_RGBA,                  // RGBA type
        24,                             // 24-bit color depth
        0, 0, 0, 0, 0, 0,               // color bits ignored
        0,                              // no alpha buffer
        0,                              // shift bit ignored
        0,                              // no accumulation buffer
        0, 0, 0, 0,                     // accum bits ignored
        16,                             // 16-bit z-buffer
        0,                              // no stencil buffer
        0,                              // no auxiliary buffer
        PFD_MAIN_PLANE,                 // main layer
        0,                              // reserved
        0, 0, 0                         // layer masks ignored
    };
    int m_nPixelFormat = ::ChoosePixelFormat(m_pDC->GetSafeHdc(), &pfd);
    if (m_nPixelFormat == 0)
    {
        return FALSE;
    }
    if (::SetPixelFormat(m_pDC->GetSafeHdc(), m_nPixelFormat, &pfd) == FALSE)
    {
        return FALSE;
    }
    return TRUE;
}