"Correct" use of QOpenGLFunctions_X_X_Core

[OttoCologne]

Hi,

I'm currently porting my visualization software from Qt4 to Qt5. In the process I replaced GLEW and want to use the built in Qt OpenGL features now. My software has several GLWidgets, some share context some not. I require at least OpenGL 3.3. The rendering happens in renderer classes which all inherit from a base renderer class. Now somewhere I found the hint that I just could inherit that base class from QOpenGLFunctions_3_3_Core and be good but that doesn't work.

In the docs I found this snippet
@QOpenGLFunctions_3_3_Core* funcs = 0;

funcs = context()->contextHandle()->versionFunctions<QOpenGLFunctions_3_3_Core>();

if (!funcs) {
    qWarning() << "Could not obtain required OpenGL context version";
    exit(1);
}
funcs->initializeOpenGLFunctions();@

But that would mean that I need to store this pointer globally and use it for every gl function call.
@const GLubyte *renderer = GLFunctions::f->glGetString( GL_RENDERER );@
That looks ugly and I would like to avoid it.

Any hint what would be a better and more convinient way to use that?

Thanks