I just realized that OpenGL works with Qt which is great news for my project. I wonder how far the implementation has been done. Actually, vertex buffer objects are not drawn (I don't get any OpenGL error). Is it a bug or not yet implemented?
Nevertheless, thanks a lot!
PS: It's not working yet on darwin:
Compiling package LazOpenGLContext 0.0.1: Exit code 1, Errors: 1, Hints: 1
glqtcontext.pas(196,29) Error: Identifier not found "QX11Info_display"