[osg-users] quad buffer stereo problem in an embedded window

[Evan Suma]

Paul,

Thank you very much for your quick response.  Your solution worked
perfectly.

- Evan


On 7/23/07, Paul Melis <paul at science.uva.nl> wrote:
>
> Hi,
>
> Evan Suma wrote:
> > I am having an issue with quad buffer stereo in OpenSceneGraph 2.0.
> > osgViewer does not seem to set up quad buffer stereo correctly when
> > run as an embedded window.  I added the following 2 lines of code to
> > the osgViewerQT example, which was running fine without stereo:
> >
> >
> osg::DisplaySettings::instance()->setStereoMode(osg::DisplaySettings::StereoMode::QUAD_BUFFER);
> > osg::DisplaySettings::instance()->setStereo(true);
> The QGLWidget that is used by osgViewerQT (in the form of the
> AdapterWidget class derived from QGLWidget) is probably not initialized
> in a way that creates a quad-buffered OpenGL context. I suspect you
> would only have to pass the correct options to the QGLWidget constructor
> being called in the AdapterWidget constructor. Something like (QT4 only):
>
> ...
>
> AdapterWidget::AdapterWidget( QWidget * parent, const char * name, const
> QGLWidget * shareWidget, WindowFlags f):
> #if USE_QT4
> QGLWidget(QGLFormat( DoubleBuffer | DepthBuffer | Rgba | StencilBuffer
> | AlphaChannel | StereoBuffers ), parent, shareWidget, f )
> #else
>    QGLWidget(parent, name, shareWidget, f)
> #endif
> {
>    _gw = new osgViewer::GraphicsWindowEmbedded(0,0,width(),height());
> }
>
> ...
>
> See e.g. http://doc.trolltech.com/4.3/qtopengl.html
>
> Hope this helps,
> Paul
> >
> > This produces the following error at runtime:
> >
> > Warning: detected OpenGL error 'invalid operation' after
> > RenderBin::draw(,)
> >
> > Please be aware that stereo is enabled on my machine.  I have tested
> > quad buffer stereo in other OpenSceneGraph applications (which do not
> > embed the viewer in a window) and it produces the correct result.  Is
> > anyone aware of this issue?  Is there some additional setup I have to
> > do in order to get quad buffer stereo working with the osgViewerQT
> > example?
> >
> > Thanks,
> > Evan
> >
> > --------------------
> > Evan A. Suma
> > Ph.D. Student
> > Future Computing Lab
> > University of North Carolina at Charlotte
> > http://www.evansuma.com <http://www.evansuma.com>
> >
> > ------------------------------------------------------------------------
> >
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> > osg-users at lists.openscenegraph.org
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
>
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>



-- 
--------------------
Evan A. Suma
Ph.D. Student
Future Computing Lab
University of North Carolina at Charlotte
http://www.evansuma.com
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