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wlroots/docs/env_vars.md
Simon Ser 6d90518c97 egl: add WLR_EGL_NO_MODIFIERS 
Same as WLR_DRM_NO_MODIFIERS but for EGL. For debugging purposes
mostly.

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3451
2022-10-21 09:52:18 +02:00

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wlroots reads these environment variables

wlroots specific

  • WLR_BACKENDS: comma-separated list of backends to use (available backends: libinput, drm, wayland, x11, headless)
  • WLR_NO_HARDWARE_CURSORS: set to 1 to use software cursors instead of hardware cursors
  • WLR_XWAYLAND: specifies the path to an Xwayland binary to be used (instead of following shell search semantics for "Xwayland")
  • WLR_RENDERER: forces the creation of a specified renderer (available renderers: gles2, pixman, vulkan)
  • WLR_RENDER_DRM_DEVICE: specifies the DRM node to use for hardware-accelerated renderers.
  • WLR_EGL_NO_MODIFIERS: set to 1 to disable format modifiers in EGL, this can be used to understand and work around driver bugs.

DRM backend

  • WLR_DRM_DEVICES: specifies the DRM devices (as a colon separated list) instead of auto probing them. The first existing device in this list is considered the primary DRM device.
  • WLR_DRM_NO_ATOMIC: set to 1 to use legacy DRM interface instead of atomic mode setting
  • WLR_DRM_NO_MODIFIERS: set to 1 to always allocate planes without modifiers, this can fix certain modeset failures because of bandwidth restrictions.

Headless backend

  • WLR_HEADLESS_OUTPUTS: when using the headless backend specifies the number of outputs

libinput backend

  • WLR_LIBINPUT_NO_DEVICES: set to 1 to not fail without any input devices

Wayland backend

  • WLR_WL_OUTPUTS: when using the wayland backend specifies the number of outputs

X11 backend

  • WLR_X11_OUTPUTS: when using the X11 backend specifies the number of outputs

gles2 renderer

  • WLR_RENDERER_ALLOW_SOFTWARE: allows the gles2 renderer to use software rendering

scenes

  • WLR_SCENE_DEBUG_DAMAGE: specifies debug options for screen damage related tasks for compositors that use scenes (available options: none, rerender, highlight)
  • WLR_SCENE_DISABLE_DIRECT_SCANOUT: disables direct scan-out for debugging.
  • WLR_SCENE_DISABLE_VISIBILITY: If set to 1, the visibility of all scene nodes will be considered to be the full node. Intelligent visibility canculations will be disabled.

Generic

  • DISPLAY: if set probe X11 backend in wlr_backend_autocreate
  • WAYLAND_DISPLAY, WAYLAND_SOCKET: if set probe Wayland backend in wlr_backend_autocreate
  • XCURSOR_PATH: directory where xcursors are located
  • XDG_SESSION_ID: if set, session ID used by the logind session