We need to call eglBindAPI() with GLES before we setup the secondary GPU blit. We've been lucky not really needing this, as it has been GLES default, which is what the secondary blit uses, in order to not depend on the default, or if we want to create the secondary blit objects after initializing cogl, we must make sure to bind the right API at the right time. As we need to bind the GLES API when setting up the secondary blit, we need to make sure that cogl gets the right API bound when that's done, so Cogl can continue working. For this, add a "bind_api()" method on the CoglRenderer object, that will know what API is correct to bind. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1828>
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
See HACKING.md.
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.