[GtkGLExt] so quiet... I asked about swapping buffers.

[Rob Stoddard <rstoddard telanetix com>]

I am wondering if there's anybody else subscribed to this mailing 
list...  I haven't gotten any traffic at all!

Yesterday I asked about swapping buffers on numerous widgets.  I am 
wondering if it is at all possible to swap buffers on a number of 
widgets without each buffer swap happening on a different screen 
refresh.  I have tried numerous approaches and so far have seen my video 
get slower and slower for each video stream I am sending to the screen.  
There is frame stutter once I have more than three frames running.   My 
screen refreshes at 60 Hz, and my video is coming in at 30 FPS.  I 
should (theoretically) see the video run nice and smooth, however, 
that's not happening.   I think it's because when swap_buffers is 
called, the call blocks until buffers are swapped.  I have implemented 
instrumentation which indicates this.   A small sample of the output of 
that instrumentation is below:

14304
16473
16504
16797
16235


This is in microseconds.  I do all of the draws for each OpenGL widget 
in an idle function, and then loop through and swap each.  The 
instrumentation only times the swap_buffers call.  I supply a glFinish() 
before, so there is no delay due to queued OpenGL calls.


Is there a way to possibly do all of the widget swaps in one fell swoop?


Thank you for your support,

Rob Stoddard