7c88977d33
Fixes subtle breakage which could sometimes trigger after a server reset with multiple screens using glamor: Screen A enters glamor_close_screen last and calls various cleanup functions, which at some point call glamor_make_current to make sure screen A's GL context is current. This sets lastGLContext to screen A's &glamor_priv->ctx. Finally, glamor_close_screen calls glamor_release_screen_priv, which calls free(glamor_priv). Later, screen B enters glamor_init, which allocates a new glamor_priv. With bad luck, this can return the same pointer which was previously used for screen A's glamor_priv. So when screen B's glamor_init calls glamor_make_current, lastGLContext == &glamor_priv->ctx, so MakeCurrent isn't called for screen B's GL context, and the following OpenGL API calls triggered by glamor_init mess up screen A's GL context. The observed end result of this was a crash in glamor_get_vbo_space because glamor_priv->vbo didn't match the GL context, though there might be other possible outcomes. Assigning the actual GL context pointer to lastGLContext prevents this by preventing the false negative test in glamor_make_current. Reviewed-by: Keith Packard <keithp@keithp.com> Reviewed-by: Eric Anholt <eric@anholt.net> |
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| Xext | ||
| Xi | ||
| composite | ||
| config | ||
| damageext | ||
| dbe | ||
| dix | ||
| doc | ||
| dri3 | ||
| exa | ||
| fb | ||
| glamor | ||
| glx | ||
| hw | ||
| include | ||
| m4 | ||
| man | ||
| mi | ||
| miext | ||
| os | ||
| present | ||
| pseudoramiX | ||
| randr | ||
| record | ||
| render | ||
| test | ||
| xfixes | ||
| xkb | ||
| .dir-locals.el | ||
| .gitignore | ||
| COPYING | ||
| Makefile.am | ||
| README | ||
| autogen.sh | ||
| configure.ac | ||
| devbook.am | ||
| docbook.am | ||
| fix-miregion | ||
| fix-miregion-private | ||
| fix-patch-whitespace | ||
| fix-region | ||
| manpages.am | ||
| meson.build | ||
| meson_options.txt | ||
| xorg-server.m4 | ||
| xorg-server.pc.in | ||
| xserver.ent.in | ||
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.
For a comprehensive overview of X Server and X Window System, consult the
following article:
https://en.wikipedia.org/wiki/X_server
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