In this screencast (OpenGL video tutorial), I explain how to add an overlay to your OpenGL window. I also explain how to use glPushAttrib().
OpenGL commands used in this screencast: glPushAttrib()
OpenGL parameters used in this screencast: GL_TRANSFORM_BIT, GL_ENABLE_BIT
The code is available to download on Github
Watch the Screencast
Code (this is not all of the code- please see the github link above for all of it)
Questions? E-mail me: this domain AT gmail DOT com