[Bug 99247] glReadPixels on Intel N3700 (Braswell) slower than Raspberry Pi

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99247

--- Comment #12 from Jason Ekstrand <jason at jlekstrand.net> ---
(In reply to Pierre Proske from comment #11)
> Wow! 
> 
> So without PBO's the app works slightly better but is still pretty slow
> (using glGetTexImage() and RGBA) however when I enable PBO's using RGBA the
> result is blistering! I'm now getting much faster rates than Windows :D :D
> 
> If it's useful I could send another trace without the PBO optimisation.

That might be interesting.  RGBA should, apart from stalling the GPU, be
reasonably fast even without the PBO.  It'd be good to know why it isn't.

> Otherwise I'm back in the land of the living :)

Glad you're happy!  Are you still interested in faster RGB?  If not, I'd like
to leave the bug open but mark it as an enhancement so we don't forget RGB is
slow.

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