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Simon Ser f5889319f7 backend/drm: fix queued cursor FB overwritten with NULL 
With the following sequence of events, the cursor FB fields could
end up being all set to NULL while the cursor is enabled:

1. set_cursor is called, conn->cursor_pending_fb is set to a FB
   pointer.
2. The output is committed with a buffer. crtc->cursor->queued_fb
   is set to the FB pointer, conn->cursor_pending_fb is reset to
   NULL. A page-flip event is expected in the future.
3. The output is committed with a modeset before the page-flip
   event is triggered. crtc->cursor->queued_fb is reset to NULL.

At this point all of crtc->cursor->current_fb,
crtc->cursor->queued_fb and conn->cursor_pending_fb are NULL which
is a bogus state when the cursor plane is enabled.

To avoid this issue, avoid overwriting crtc->cursor->queued_fb
with a NULL pointer on commit. The cursor logic still isn't great,
but let's keep a rework of that for a separate patch.

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3734
2024-03-04 01:37:52 +00:00
.builds ci: drop stale dependencies 2023-12-10 14:29:23 +01:00
.gitlab/issue_templates Add GitLab issue template 2023-10-08 11:29:13 +00:00
backend backend/drm: fix queued cursor FB overwritten with NULL 2024-03-04 01:37:52 +00:00
docs docs: add architecture document 2023-10-10 09:50:57 +00:00
examples input-device: unconfuse tablet naming 2024-02-29 16:09:07 +01:00
include wlr_tablet_v2: fix destroy listener name 2024-02-29 16:09:08 +01:00
protocol ext-foreign-toplevel-list-v1: new protocol implementation 2024-02-12 01:05:19 +01:00
render render/egl: drop wlr_egl_is_current() 2024-02-23 18:52:48 +01:00
tinywl pointer: use enum wl_pointer_button_state 2024-02-28 16:39:18 +00:00
types wlr_tablet_v2: fix destroy listener name 2024-02-29 16:09:08 +01:00
util Define _POSIX_C_SOURCE globally 2024-02-15 15:41:12 +01:00
xcursor Define _POSIX_C_SOURCE globally 2024-02-15 15:41:12 +01:00
xwayland xwayland: add map_request signal 2024-02-23 12:46:25 -05:00
.editorconfig Relax 80 column limit 2022-11-22 18:19:46 +00:00
.gitignore gitignore: remove build dir entries 2022-06-14 10:08:54 +02:00
.gitlab-ci.yml ci: add .gitlab-ci.yml 2021-11-01 16:51:18 +01:00
CONTRIBUTING.md contributing: add safety section 2023-10-04 11:08:58 +02:00
LICENSE license: add copyright line for all contributors 2023-07-05 10:27:50 +02:00
meson.build Define _POSIX_C_SOURCE globally 2024-02-15 15:41:12 +01:00
meson_options.txt backend/session: make optional 2022-11-25 16:15:29 +00:00
README.md backend/drm: use libdisplay-info to parse EDID 2023-02-28 14:44:02 +00:00
wlroots.syms build: simplify version script 2021-06-17 11:03:21 +02:00

README.md

wlroots

Pluggable, composable, unopinionated modules for building a Wayland compositor; or about 60,000 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.

Check out our wiki to get started with wlroots. Join our IRC channel: #wlroots on Libera Chat.

A variety of wrapper libraries are available for using it with your favorite programming language.

Building

Install dependencies:

  • meson
  • wayland
  • wayland-protocols
  • EGL and GLESv2 (optional, for the GLES2 renderer)
  • Vulkan loader, headers and glslang (optional, for the Vulkan renderer)
  • libdrm
  • GBM (optional, for the GBM allocator)
  • libinput (optional, for the libinput backend)
  • xkbcommon
  • udev (optional, for the session)
  • pixman
  • libseat (optional, for the session)
  • hwdata (optional, for the DRM backend)
  • libdisplay-info (optional, for the DRM backend)
  • libliftoff (optional, for the DRM backend)

If you choose to enable X11 support:

  • xwayland (build-time only, optional at runtime)
  • libxcb
  • libxcb-render-util
  • libxcb-wm
  • libxcb-errors (optional, for improved error reporting)

Run these commands:

meson setup build/
ninja -C build/

Install like so:

sudo ninja -C build/ install

Contributing

See CONTRIBUTING.md.