Hi,
On 27/09/2013 07:35, Thomas Meyer wrote:
> Hi,
> is it possible to render in a QGLWidget with the OGL 4.3 functions?
Yes but it is now recommended to use QWindow + QOpenGLContext for new
code as QGLWidget will not see any further development.
> If so, how can I call the functions?
You need to get hold of the function entry points for the OpenGL 4.3
functions. This can be done via the QOpenGLContext to get a pointer to a
QOpenGLFunctions_4_3_Core or QOpenGLFunctions_4_3_Compatibility object
depending upon which profile you are using.
If using a QOpenGLContext directly you can just do something like this:
QSurfaceFormat f;
f.setVersion(4, 3);
f.setProfile(QSurfaceFormat::CoreProfile);
m_context = new QOpenGLContext( this );
m_context->setFormat( f );
m_context->create();
QOpenGLFunctions_4_3_Core *funcs =
m_context->versionFunctions<QOpenGLFunctions_4_3_Core>();
if (!funcs) {
qDebug() << "Could not obtain OpenGL 4.3 function entry points";
return;
}
funcs->initializeOpenGLFunctions();
// From here you can use funcs to call any OpenGL 4.3 function
funcs->glTextureView(...);
If you are using QGLWidget then instead of creating your own context as
in the above code you can get hold of QGLWidget's context via:
QOpenGLContext *context = m_glWidget->context()->contextHandle();
then follow the above to get the QOpenGLFunctions_4_3_Core pointer. Just
remember to ask QGLWidget to create a 4.3 context via QGLFormat
(analogous to QSurfaceFormat above).
Hope this helps,
Sean
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