On 12/23/11 2:43 AM, Stefan Eilemann wrote:
>> Why not just have your application putenv("VGL_READBACK=0")? That
>> prevents VirtualGL from reading back and sending frames, if you have
>> other means of doing that. You could, for instance, wrap a
>> glXSwapBuffers() call around which you don't want VirtualGL to do readback:
>
> I assume VGL does not read back offscreen buffers (FBO, PBuffer), and I
> specifically want VGL to readback and transport the visible destination
> window.
Correct. It doesn't read back anything except "Pbuffer windows", that
is, Pbuffers that are substituting for windows behind the scenes. I
still am not understanding why you would need the app to behave
differently if VirtualGL is present. If it's using Pbuffers/FBO's for
the subrenderers, then where/why is the "extra readback" occurring?
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