Hi,
I am setting up a QGLWidget to perform some rendering. I would like to enable the overlay context but it doesnt seem to be working on my windows 7 64-bit machine.

Here is the code :
Qt Code: 
  1. // allocate the hidden viewport
  2. 	hiddenViewPort = new QGLWidget(QGLFormat(QGL::HasOverlay|QGL::DoubleBuffer|QGL::DepthBuffer|QGL::Rgba|QGL::AlphaChannel|
  3. 	                                         QGL::AccumBuffer|QGL::StencilBuffer|QGL::NoStereoBuffers|QGL::DirectRendering));
  4.  
  5. 	// get the format
  6. 	QGLFormat format = hiddenViewPort->format();
  7.  
  8. 	// test it's capabilities
  9. 	if(!format.hasOverlay())
  10. 		vcl_cerr << "qViewManager : no overlays\n";
  11.  
  12. 	if(!format.doubleBuffer())
  13. 		vcl_cerr << "qViewManager : got single buffer\n";
  14.  
  15. 	if(!format.depth())
  16. 		vcl_cerr << "qViewManager : no depth buffer\n";
  17.  
  18. 	if(!format.rgba())
  19. 		vcl_cerr << "qViewManager : index color\n";
  20.  
  21. 	if(!format.directRendering())
  22. 		vcl_cerr << "qViewManager : no direct rendering\n";
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The hasOverlay() check on the format is always false. Is this behaviour to be expected on my platform?

If so what are my other options for drawing GL_POINTS etc... in my QGLWidget?

Thanks,
Dave...