https://bugs.freedesktop.org/show_bug.cgi?id=75545
Priority: medium
Bug ID: 75545
Assignee: mesa-dev@lists.freedesktop.org
Summary: Blitting a partial region to the front buffer produces
corrupted display
Severity: normal
Classification: Unclassified
OS: All
Reporter: feder...@gnome.org
Hardware: Other
Status: NEW
Version: 9.2
Component: Other
Product: Mesa
For the original bug behind this, please see
https://bugzilla.gnome.org/show_bug.cgi?id=674208
In Gnome apps, including gnome-shell, Clutter and Cogl try to avoid doing a
full-screen update on every rendered frame by just doing a glBlitFramebuffer()
of the dirty region from the back buffer to the front buffer. The idea is that
with software rendering, Mesa will do an XPutImage() of small regions, instead
of the whole screen, to minimize the amount of data transferred to the
(possibly remote) X server. However, this is broken in drisw, and has been for
a couple of years now.
This piglit test exposes the bug (needs to be run with
LIBGL_ALWAYS_SOFTWARE=1):
http://lists.freedesktop.org/archives/piglit/2014-February/009701.html
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