[Bug 90839] [10.5.5/10.6 regression, bisected] PBO glDrawPixels no longer using blit fastpath

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90839

--- Comment #4 from Alexander Monakov <amonakov at gmail.com> ---
I can't reproduce it either; actually, I don't see RGBX configs in glxinfo
output, should they manifest there?

Anyhow, can the check in do_blit_drawpixels be relaxed to allow RGBX<->RGBA
blits?   intel_miptree_blit is able to handle it per this comment:
http://cgit.freedesktop.org/mesa/mesa/tree/src/mesa/drivers/dri/i965/intel_blit.c?id=536003c11e4cb1172c540932ce3cce06f03bf44e#n170

About using Meta for Drawpixels, it needs work to avoid regressing performance,
please see discussion in comments 2, 3, 4 at
https://bugs.freedesktop.org/show_bug.cgi?id=77412

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