[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 #6 from Jason Ekstrand <jason at jlekstrand.net> ---
Pierre,
Generally, I would recommend against using RGB formats and expecting them to be
fast.  Very little modern hardware has actual RGB format support.  Many drivers
will have gone out of their way to try and Kane it fast for legacy applications
but every time you use one you're rolling the dice and hoping you hit the
optimized path.  It's almost always better to use RGBA.

Ken,
Yes, we can accelerate it.  Assuming Topi landed his blorp upload patches, it
shouldn't be hard.  As of recently, blorp has full support for RGB
destinations.  It won't be as fast as RGBA because we execute the fragment
shader three times per pixel but it should be faster than the CPU fallback.

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