How ogldebug Operates

The OpenGL debugger works like this:

You invoke ogldebug for an application.
A special library (libogldebug.so) intercepts OpenGL or GLX calls from the application to the OpenGL library (libGL.so).
You can run, halt, step, and trace the application using the ogldebug graphical interface.
After ogldebug-related processing, the actual OpenGL calls are made as they would have been had ogldebug not been present.