[GtkGLExt] numerous contexts, 1 swap?

[Rob Stoddard <rstoddard telanetix com>]

I am working on a video conference application that uses gtkglextmm to 
display the video.  At current, I am swapping after drawing on each 
video frame.  This works great until a number of different video 
thumbnails are visible, at that point the main video screen's quality 
starts degrading; it seems to stutter.  This is because the framerate on 
that particular screen has dropped below 20 FPS.  I think if I were to 
consolidate all the swapping somehow, I would be able to get good 
quality video.   I have tried numerous approaches with sometimes amusing 
results, but none were satisfactory.

I am wondering if there's an expert out there that can confirm this:    
Does swapping buffers on one OpenGL widget swap buffers for them all?


Thank you for your assistance

Rob Stoddard