自己按照网上的尝试了下mfc框架的opengl，但是根本就没有绘图，连背景都没有显示。求帮助。以下是代码，我自己创建了一个继承CWnd的类，如下：
C/C++ code
IMPLEMENT_DYNAMIC(COpenGL, CWnd)
COpenGL::COpenGL()
{
}
COpenGL::~COpenGL()
{
wglMakeCurrent(NULL,NULL);
wglDeleteContext(hglrc);
::ReleaseDC(m_hWnd,hdc);
}
BEGIN_MESSAGE_MAP(COpenGL, CWnd)
ON_WM_CREATE()
ON_WM_PAINT()
END_MESSAGE_MAP()
// COpenGL 消息处理程序
int COpenGL::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CWnd::OnCreate(lpCreateStruct) == -1)
return -1;
// TODO: 在此添加您专用的创建代码
MySetPixelFormat(::GetDC(m_hWnd));
hdc = ::GetDC(m_hWnd);
hglrc = wglCreateContext(hdc);
CRect rect;
this->GetWindowRect(&rect);
wglMakeCurrent(hdc,hglrc);
glShadeModel(GL_SMOOTH);
glClearColor(1.0f,1.0f,1.0f,1.5f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glViewport (0, 0, rect.Width(),rect.Height());
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluPerspective(65.0, (GLfloat)rect.Width()/(GLfloat)rect.Height(), 1, 1000);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
return 0;
}
void COpenGL::OnPaint()
{
//CPaintDC dc(this); // device context for painting
// TODO: 在此处添加消息处理程序代码
// 不为绘图消息调用 CWnd::OnPaint()
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); //清除颜色缓存和深度缓存
glLoadIdentity();
gluLookAt(0,5,2, 0,0,0, 0,0,1);
glColor3f(0.5f,0.5f,1.0f); // 一次性将当前色设置为蓝色
glBegin(GL_QUADS); // 绘制正方形
glVertex3f(300.0f, 300.0f, 0.0f);
glVertex3f(300.0f, -300.0f, 0.0f);
glVertex3f(-300.0f, -300.0f, 0.0f);
glVertex3f(-300.0f, 300.0f, 0.0f);
glEnd();
SwapBuffers(hdc);
}
int COpenGL::MySetPixelFormat(HDC hdc)
{
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW|
PFD_SUPPORT_OPENGL|
PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
24,
0 ,0 ,0 ,0 ,0 ,0 ,
0 ,
0 ,
0 ,
0 ,0 ,0 ,0 ,
32 ,
0 ,
0 ,
PFD_MAIN_PLANE,
0 ,
0 ,0 ,0
};
int iPixelFormat;
if(iPixelFormat = ChoosePixelFormat(hdc,&pfd) == 0)
{
::MessageBox(NULL,"ChoosePixelFormat Failed","error",MB_OK);
return 0;
}
if(SetPixelFormat(hdc,iPixelFormat,&pfd))
{
::MessageBox(NULL,"SetPixelFormat Failed","error",MB_OK);
return 0;
}
return 1;
}
另外 在主对话框中有如下代码：
C/C++ code
BOOL CMyProjectDlg::OnInitDialog()
{
CDialogEx::OnInitDialog();
// 将“关于...”菜单项添加到系统菜单中。
// IDM_ABOUTBOX 必须在系统命令范围内。
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
BOOL bNameValid;
CString strAboutMenu;
bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
ASSERT(bNameValid);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
// 执行此操作
SetIcon(m_hIcon, TRUE); // 设置大图标
SetIcon(m_hIcon, FALSE); // 设置小图标
// TODO: 在此添加额外的初始化代码
CRect rect;
GetDlgItem(IDC_STATIC)->GetWindowRect(rect);
ScreenToClient(rect);
m_pDisplay->Create(NULL,
NULL,
WS_CHILD|WS_CLIPSIBLINGS|WS_CLIPCHILDREN|WS_VISIBLE,
rect,
this,
0);
return TRUE; // 除非将焦点设置到控件，否则返回 TRUE
}
