qt : qt-everywhere-opensource-src-4.7.1
HW platform: broadcom7413

Broadcom7413 support openGL es 1.1(standard),and I'm porting QT on it.

But here below returns 0(qgl_qws.cpp),so nothing displayed on QGLWidget.
What can I do ?Do I need to implement the screen driver ?(but I have done this on qscreenlinuxfb_qws.cpp : setting display and framebuffer ,the 2D display is OK)Maybe only the QGLscreen?.

Qt Code: 
  1. static QGLScreen *glScreenForDevice(QPaintDevice *device)
  2. {
  3.     QScreen *screen = qt_screen;
  4.     if (screen->classId() == QScreen::MultiClass) {
  5.  
  6. 	 int screenNumber;
  7.         if (device && device->devType() == QInternal::Widget)
  8.             screenNumber = qApp->desktop()->screenNumber(static_cast<QWidget *>(device));
  9.         else
  10.             screenNumber = 0;
  11.         screen = screen->subScreens()[screenNumber];
  12.     }
  13.     while (screen->classId() == QScreen::ProxyClass ||
  14.            screen->classId() == QScreen::TransformedClass) {
  15.         screen = static_cast<QProxyScreen *>(screen)->screen();
  16.     }
  17.     if (screen->classId() == QScreen::GLClass)
  18.     {
  19. 	return static_cast<QGLScreen *>(screen);
  20.     }
  21.     else
  22.         return 0;
  23. }
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