OK, bad idea.
The effort necessary to encapsulate GLUT/freeglut in a single class is an herculean task.
What I'd accomplished until now was:
As one may notice the mbfGL class is made of static members. So, actually speaking, it's a lie.
After some forum scrutinizing I've concluded that Qt is what I'm looking for: an OO approach to OpenGL needs.
For now, I'll remain coding on freeglut.
Qt scheduled.