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Jonas Ådahl fb38c451b5 kms: Add atomic MetaKmsImplDevice backend 
This adds a MetaKmsImplDevice backend using atomic drmMode* API in constrast to
non-atomic legacy drmMode* API used in MetaKmsImplDeviceSimple.

This has various behavioral differences worth noting, compared to the
simple backend:

 * We can only commit once per CRTC per page flip.

This means that we can only update the cursor plane once. If a primary
plane composition missed a dead line, we cannot commit only a cursor
update that would be presented earlier.

 * Partial success is not possible with the atomic backend.

Cursor planes may fail with the simple backend. This is not the case
with the atomic backend. This will instead later be handled using API
specific to the atomic backend, that will effectively translate into
TEST_ONLY commits.

For testing and debugging purposes, the environment variable
MUTTER_DEBUG_ENABLE_ATOMIC_KMS can be set to either 1 or 0 to
force-enable or force-disable atomic mode setting. Setting it to some
other value will cause mutter to abort().

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/548
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>
2021-01-22 16:47:08 +00:00
.gitlab/issue_templates gitlab: Add missing < in markdown comment tag 2020-02-14 03:10:28 +00:00
.gitlab-ci ci: Replace custom commit-log script with ci-fairy 2021-01-11 14:02:58 +01:00
clutter cursor-renderer/native: Update HW state during frames 2021-01-22 16:47:08 +00:00
cogl kms: Add symbolic page flips and cogl frame infos 2021-01-22 16:47:08 +00:00
data xwayland: Enable Xwayland on demand by default 2021-01-19 09:33:33 +01:00
doc Add MetaGravity and replace X11 equivalent with it 2020-02-29 21:01:50 +00:00
meson
po Update Portuguese translation 2021-01-20 11:50:55 +00:00
src kms: Add atomic MetaKmsImplDevice backend 2021-01-22 16:47:08 +00:00
subprojects build: bump ABI to sysprof-capture-4 2020-07-28 11:13:30 -07:00
tools
.gitignore build: bump ABI to sysprof-capture-4 2020-07-28 11:13:30 -07:00
.gitlab-ci.yml build: Bump gsettings-desktop-schemas dependency 2021-01-14 13:58:16 +00:00
config.h.meson xwayland: Check for listenfd option 2021-01-22 11:40:30 +01:00
COPYING
meson_options.txt xwayland: Check X11 clients prior to terminate Xwayland 2021-01-18 17:52:22 +01:00
meson.build xwayland: Check for listenfd option 2021-01-22 11:40:30 +01:00
mutter.doap mutter.doap: Add marge-bot as a maintainer 2020-11-16 11:59:45 +01:00
NEWS Tag release 40.alpha.1.1 2021-01-14 17:22:43 +01:00
README.md README: Elaborate coding style and commit message guidelines 2020-10-28 07:28:55 +00:00

README.md

Mutter

Mutter is a Wayland display server and X11 window manager and compositor library.

When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.

When used on top of Xorg it acts as a X11 window manager and compositing manager.

It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.

Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork af Clutter, a scene graph and user interface toolkit.

Mutter is used by, for example, GNOME Shell, the GNOME core user interface, and by Gala, elementary OS's window manager. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.

Contributing

To contribute, open merge requests at https://gitlab.gnome.org/GNOME/mutter.

It can be useful to look at the documentation available at the Wiki.

Coding style and conventions

The coding style used is primarily the GNU flavor of the GNOME coding style with some additions:

  • Use regular C types and stdint.h types instead of GLib fundamental types, except for gboolean, and guint/gulong for GSource ids and signal handler ids. That means e.g. uint64_t instead of guint64, int instead of gint, unsigned int instead of guint if unsignedness is of importance, uint8_t instead of guchar, and so on.

  • Try to to limit line length to 80 characters, although it's not a strict limit.

  • Usage of g_autofree and g_autoptr are encouraged. The style used is

  g_autofree char *text = NULL;
  g_autoptr (MetaSomeThing) thing = NULL;

  text = g_strdup_printf ("The text: %d", a_number);
  thing = g_object_new (META_TYPE_SOME_THING,
                        "text", text,
                        NULL);
  thinger_use_thing (rocket, thing);

  • Declare variables at the top of the block they are used, but avoid non-trivial logic among variable declarations. Non-trivial logic can be getting a pointer that may be NULL, any kind of math, or anything that may have side effects.

  • Instead of boolean arguments in functions, prefer enums or flags when they're more expressive.

  • Use g_new0() etc instead of g_slice_new0().

  • Initialize and assign floating point variables (i.e. float or double) using the form floating_point = 3.14159 or ratio = 2.0.

Git messages

Commit messages should follow the GNOME commit message guidelines. We require an URL to either an issue or a merge request in each commit. Try to always prefix commit subjects with a relevant topic, such as compositor: or clutter/actor:, and it's always better to write too much in the commit message body than too little.

License

Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.