[Bug 101572] glMemoryBarrier is backwards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101572

--- Comment #4 from Matias N. Goldberg <dark_sylinc at yahoo.com.ar> ---
After careful thought; I realized I don't need to switch to a dummy FBO; just
unset the current one.

That DOES make sense to me as while the FBO is bound and I'm executing the
compute shader that reads from it, I could as well be telling the driver to do
both things at the same time.

I could see why unsetting the FBO would flush the necessary caches (due to
OpenGL guarantees, I'm saying "I'm done writing to this FBO" and now reads
should be guaranteed to be correct), so I'm going to take this for an answer.

I don't want to spend much more time on this matter either.

Thanks.

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