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It appears that on some hardware/diver combo such as nv30/nouveau, using GL_ALPHA as format for 8-bit depth will cause an incomplete attachment error (GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT) when trying to bind the texture. As a result, the FBO is NULL and glamor segfaults when trying to access the FBO width/height in pixmap_priv_get_scale() in glamor_xv_render(). This happens with glamor-xv which uses 8-bit pixmaps, meaning that on such hardware/driver, trying to play a video using Xv will lead to a crash of the Xserver. This affects Xwayland, Xephyr, modesetting driver with glamor accel. But the use of an FBO is not actually needed for glamox-xv, so by disabling FBO at pixmap creation, we can avoid the issue entirely. Fix suggested by Eric Anholt <eric@anholt.net> Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=100710 Fixes: https://bugzilla.redhat.com/1412814 Reviewed-by: Eric Anholt <eric@anholt.net>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
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