33a9a1cace
Indirectly via cogl_framebuffer_flush, since we also need to call glFlush now. Need to do it in cogl_onscreen_egl_swap_* because meta_onscreen_native_swap_buffers_with_damage uses cogl_context_get_latest_sync_fd. Doing it before the swap was problematic because the swap may do GPU work of its own, which wasn't covered by the EGL sync object created in _cogl_context_update_sync. This could result in visual artifacts. See the discussion starting at https://gitlab.freedesktop.org/mesa/mesa/-/issues/11996#note_2678104 for details. For similar reasons, move the cogl_framebuffer_finish calls after the swap as well. As a bonus, this eliminates one of 3 GPU work flushes to the kernel per frame with the Mesa radeonsi driver, because the glFlush/glFinish call in cogl_framebuffer_flush/finish doesn't have any GPU work to flush after SwapBuffers. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4158>
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 of 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 first look at the GNOME Handbook and the documentation and API references below first.
Documentation
- Coding style and conventions
- Git conventions
- Code overview
- Building and Running
- Debugging
- Monitor configuration
API Reference
- Meta: https://mutter.gnome.org/meta/
- Clutter: https://mutter.gnome.org/clutter/
- Cogl: https://mutter.gnome.org/cogl/
- Mtk: https://mutter.gnome.org/mtk/
Meetings
There are recurring meetings to discuss development of GNOME Shell, mutter and related components.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.