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emersion f8a50e4fe7 backend/drm: steal CRTCs from disabled outputs
This commit allows outputs that need a CRTC to steal it from
user-disabled outputs. Note that in the case there are enough
CRTCs, disabled outputs don't loose it (so there's no modeset
and plane initialization needed after DPMS). CRTC allocation
still prefers to keep the old configuration, even if that means
allocating an extra CRTC to a disabled output.

CRTC reallocation now happen when enabling/disabling an output as
well as when trying to modeset. When enabling an output without a
CRTC, we realloc to try to steal a CRTC from a disabled output
(that doesn't really need the CRTC). When disabling an output, we
try to give our CRTC to an output that needs one. Modesetting is
similar to enabling.

A new DRM connector field has been added: `desired_enabled`.
Outputs without CRTCs get automatically disabled. This field keeps
track of the state desired by the user, allowing to automatically
re-enable outputs when a CRTC becomes free.

This required some changes to the allocation algorithm. Previously,
the algorithm tried to keep the previous configuration even if a
new configuration with a better score was possible (it only changed
configuration when the old one didn't work anymore). This is now
changed and the old configuration (still preferred) is only
retained without considering new possibilities when it's perfect
(all outputs have CRTCs).

User-disabled outputs now have `possible_crtcs` set to 0, meaning
they can only retain a previous CRTC (not acquire a new one). The
allocation algorithm has been updated to do not bump the score
when assigning a CRTC to a disabled output.
2018-09-15 08:37:33 +02:00
backend backend/drm: steal CRTCs from disabled outputs 2018-09-15 08:37:33 +02:00
docs output: introduce WLR_NO_HARDWARE_CURSORS 2018-09-14 18:07:21 +02:00
examples Release pointers in examples/multi-pointer 2018-09-03 04:00:53 +05:30
include backend/drm: steal CRTCs from disabled outputs 2018-09-15 08:37:33 +02:00
protocol Revert "Revert "Merge pull request #1194 from ascent12/meson_feature"" 2018-08-24 19:35:02 +12:00
render Init dmabuf global in renderer 2018-09-02 08:50:43 +02:00
rootston Merge pull request #1243 from emersion/layer-shell-suffix 2018-09-14 20:47:42 -04:00
types Merge pull request #1241 from emersion/output-enable-error-checking 2018-09-14 21:14:18 -04:00
util Add function wlr_log_get_verbosity() 2018-09-01 21:03:52 +05:30
xcursor util: add wlr_ prefix to log symbols 2018-07-09 22:49:54 +01:00
xwayland Fix wlr_xwayland_destroy 2018-09-08 13:00:56 +02:00
.build.yml Add clang's static analyzer to build.yml 2018-08-31 19:41:18 +02:00
.editorconfig Remove indent_size from .editorconfig 2018-09-05 11:59:38 +12:00
.gitignore update .gitignore 2018-03-03 15:23:26 +01:00
CONTRIBUTING.md util: add wlr_ prefix to log symbols 2018-07-09 22:49:54 +01:00
LICENSE Update LICENSE year (MIT license) 2018-04-12 21:29:59 -04:00
README.md Fix xcb/xkb swap in README 2018-05-05 00:25:11 -05:00
glgen.sh Change how glgen.sh outputs files 2018-08-24 19:35:21 +12:00
meson.build Update required meson version to 0.47.1 2018-08-24 09:20:25 -04:00
meson_options.txt Revert "Revert "Merge pull request #1194 from ascent12/meson_feature"" 2018-08-24 19:35:02 +12:00
wlroots.syms Remove symbol versioning from DSO 2018-07-20 11:09:56 +01:00

README.md

wlroots

Pluggable, composable, unopinionated modules for building a Wayland compositor; or about 40,000 lines of code you were going to write anyway.

  • wlroots provides backends that abstract the underlying display and input hardware, including KMS/DRM, libinput, Wayland, X11, and headless backends, plus any custom backends you choose to write, which can all be created or destroyed at runtime and used in concert with each other.
  • wlroots provides unopinionated, mostly standalone implementations of many Wayland interfaces, both from wayland.xml and various protocol extensions. We also promote the standardization of portable extensions across many compositors.
  • wlroots provides several powerful, standalone, and optional tools that implement components common to many compositors, such as the arrangement of outputs in physical space.
  • wlroots provides an Xwayland abstraction that allows you to have excellent Xwayland support without worrying about writing your own X11 window manager on top of writing your compositor.
  • wlroots provides a renderer abstraction that simple compositors can use to avoid writing GL code directly, but which steps out of the way when your needs demand custom rendering code.

wlroots implements a huge variety of Wayland compositor features and implements them right, so you can focus on the features that make your compositor unique. By using wlroots, you get high performance, excellent hardware compatibility, broad support for many wayland interfaces, and comfortable development tools - or any subset of these features you like, because all of them work independently of one another and freely compose with anything you want to implement yourself.

Status: prior to 1.0 the API is not stable, but we've done most of the work and various projects are using wlroots to build Wayland compositors with.

wlroots is developed under the direction of the sway project. A variety of wrapper libraries are available for using it with your favorite programming language.

Building

Install dependencies:

  • meson
  • wayland
  • wayland-protocols
  • EGL
  • GLESv2
  • libdrm
  • GBM
  • libinput
  • xkbcommon
  • udev
  • pixman
  • systemd (optional, for logind support)
  • elogind (optional, for logind support on systems without systemd)
  • libcap (optional, for capability support)

If you choose to enable X11 support:

  • xcb
  • xcb-composite
  • xcb-xfixes
  • xcb-image
  • xcb-render
  • x11-xcb
  • xcb-errors (optional, for improved error reporting)
  • x11-icccm (optional, for improved Xwayland introspection)
  • xcb-xkb (optional, for improved keyboard handling on the X11 backend)

Run these commands:

meson build
ninja -C build

On FreeBSD, you need to pass an extra flag to prevent a linking error: meson build -D b_lundef=false.

Install like so:

sudo ninja -C build install

Running the test compositor

wlroots comes with a test compositor called rootston, which demonstrates the features of the library and is used as a testbed for the development of the library. It may also be useful as a reference for understanding how to use various wlroots features.

If you followed the build instructions above the rootston executable can be found at ./build/rootston/rootston. To use it, refer to the example config at ./rootston/rootston.ini.example and place a config file of your own at rootston.ini in the working directory (or in an arbitrary location via rootston -C). Other options are available, refer to rootston -h.

Contributing

See CONTRIBUTING.md.