GTK and OpenGL on Ubuntu

[Wesley Smith <wesley hoke gmail com>]

hi list,
I'm looking for some advice on using GTK with OpenGL, specifically on
the Ubuntu platform.  On Windows and OSX, I'm using native libraries,
so I don't necessarily need a solution to work across platforms.  What
I am trying to figure out is given an app using Gtk for things like
text display and menus, what is the best (in terms of performance and
ease of programming) way to incorporate OpenGL into the app.  All of
my OpenGL windows will be root-level windows with no menus (just a
window frame, if that).  In other words, I'm not going to be creating
OpenGL widgets within a Gtk window.

Are there any issues I should know about like potential side-effects
from interacting directly with the X window server?

I ask because for one I'm fairly new to linux and for another my
experiments up to this point have been a bit unstable.  I have come
across this:
http://gtkglext.sourceforge.net/  but have not used it.  Any experiences?

thanks in advance!
wes