Query OpenGL to know if there are still commands on the queue

Hi!

We have noticed some problems of render-to-texture in our application on 
some drivers (the texture remains
totally white).  After having investigated the code, I noticed it lacks 
a call to glFlush() before swapping double
buffer or releasing a pbuffer (used for the render-to-texture).

So at first, I just wanted to add a call to glFlush(), commit the code 
et voila.
The problem is we have a pretty rigorous QA that just forbids to commit 
any line of code if it's not
proved to solve a problem with an appropriate test code.

My idea was to find a way to query OpenGL and ask if there are still GL 
commands on the queue
just before swapping double buffer or releasing a pbuffer.  If yes make 
a call to glFlush().
I'm pretty confident it's a good thing to always make a glFlush() so 
this would be really just for the QA's
stuff.  Maybe, it's just not feasible anyway...

Any hint would be appreciated,

Igor.

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-- 
Author: Igor Kravtchenko
  INET: [email protected]

Fat City Hosting, San Diego, California -- http://www.fatcity.com
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