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Simon Ser 92eedb84c1 output: don't attach buffer on first commit if disabled 
In output_ensure_buffer() we create a swapchain and attach an empty
buffer to the output if necessary. We do that during the first commit.
This is fine when the first commit enables the output, however this breaks
when the first commit disables the output. A commit which disables an
output and has a buffer attached is invalid (see output_basic_test()), and
makes the DRM backend crash:

    00:00:00.780 [wlr] [backend/drm/drm.c:622] connector eDP-1: Turning off
    ../subprojects/wlroots/backend/drm/drm.c:652:44: runtime error: member access within null pointer of type 'struct wlr_drm_crtc'
    AddressSanitizer:DEADLYSIGNAL
    =================================================================
    ==2524==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f22e894afc1 bp 0x7ffe1d57c550 sp 0x7ffe1d57c420 T0)
    ==2524==The signal is caused by a READ memory access.
    ==2524==Hint: address points to the zero page.
        #0 0x7f22e894afc1 in drm_connector_commit_state ../subprojects/wlroots/backend/drm/drm.c:652
        #1 0x7f22e894b1f5 in drm_connector_commit ../subprojects/wlroots/backend/drm/drm.c:674
        #2 0x7f22e89e8da9 in wlr_output_commit_state ../subprojects/wlroots/types/output/output.c:756
        #3 0x555ab325624d in apply_output_config ../sway/config/output.c:517
        #4 0x555ab31a1aa1 in handle_new_output ../sway/desktop/output.c:974
        #5 0x7f22e9272f6d in wl_signal_emit_mutable (/usr/lib/libwayland-server.so.0+0x9f6d)
        #6 0x7f22e899b012 in new_output_reemit ../subprojects/wlroots/backend/multi/backend.c:161
        #7 0x7f22e9272f6d in wl_signal_emit_mutable (/usr/lib/libwayland-server.so.0+0x9f6d)
        #8 0x7f22e895a153 in scan_drm_connectors ../subprojects/wlroots/backend/drm/drm.c:1488
        #9 0x7f22e893c2e4 in backend_start ../subprojects/wlroots/backend/drm/backend.c:24
        #10 0x7f22e892ed00 in wlr_backend_start ../subprojects/wlroots/backend/backend.c:56
        #11 0x7f22e8999b83 in multi_backend_start ../subprojects/wlroots/backend/multi/backend.c:31
        #12 0x7f22e892ed00 in wlr_backend_start ../subprojects/wlroots/backend/backend.c:56
        #13 0x555ab317d5cc in server_start ../sway/server.c:316
        #14 0x555ab317748d in main ../sway/main.c:400
        #15 0x7f22e783c28f  (/usr/lib/libc.so.6+0x2328f)
        #16 0x7f22e783c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
        #17 0x555ab3134c84 in _start (/home/simon/src/sway/build/sway/sway+0x377c84)

Fixes: 3be6658ee7 ("output: allocate swapchain on first commit")
Closes: https://github.com/swaywm/sway/issues/7373
2023-02-02 16:48:35 +00:00
.builds xwayland: remove find_program() fallback when dep is not found 2022-12-08 01:58:34 +01:00
backend backend/wayland: don't cache next item when destroying buffers 2023-02-02 16:45:09 +00:00
docs egl: add WLR_EGL_NO_MODIFIERS 2022-10-21 09:52:18 +02:00
examples examples: use NULL theme name instead of "default" 2023-02-01 15:01:20 +01:00
include subcompositor: convert to try_from 2023-02-01 20:14:39 +01:00
protocol xdg-shell: use defunct_role_object error 2022-12-07 13:54:31 +00:00
render render/vulkan: check that requested size is smaller than max 2023-01-19 18:50:59 +00:00
tinywl xdg-shell: convert to try_from 2023-02-01 20:12:49 +01:00
types output: don't attach buffer on first commit if disabled 2023-02-02 16:48:35 +00:00
util addon: Remove extra newline from logging 2022-12-22 11:18:01 -05:00
xcursor xcursor: use internal_config 2022-12-06 22:39:45 +00:00
xwayland xwayland/xwm: reset serial in xwayland_surface_dissociate() 2023-02-01 16:33:15 +00:00
.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 Relax 80 column limit 2022-11-22 18:19:46 +00:00
LICENSE Update LICENSE year (MIT license) 2018-04-12 21:29:59 -04:00
meson.build build: use a configuration file for internal features 2022-12-06 22:39:45 +00:00
meson_options.txt backend/session: make optional 2022-11-25 16:15:29 +00:00
README.md backend/session: make optional 2022-11-25 16:15:29 +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: #sway-devel 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)

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 build/
ninja -C build/

Install like so:

sudo ninja -C build/ install

Contributing

See CONTRIBUTING.md.