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wlroots reads these environment variables
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# wlroots specific
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* *WLR_BACKENDS*: comma-separated list of backends to use (available backends:
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libinput, drm, wayland, x11, headless)
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* *WLR_NO_HARDWARE_CURSORS*: set to 1 to use software cursors instead of
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hardware cursors
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* *WLR_XWAYLAND*: specifies the path to an Xwayland binary to be used (instead
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of following shell search semantics for "Xwayland")
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* *WLR_RENDERER*: forces the creation of a specified renderer (available
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renderers: gles2, pixman, vulkan)
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* *WLR_RENDER_DRM_DEVICE*: specifies the DRM node to use for
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hardware-accelerated renderers.
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* *WLR_EGL_NO_MODIFIERS*: set to 1 to disable format modifiers in EGL, this can
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be used to understand and work around driver bugs.
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## DRM backend
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* *WLR_DRM_DEVICES*: specifies the DRM devices (as a colon separated list)
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instead of auto probing them. The first existing device in this list is
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considered the primary DRM device.
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* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
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mode setting
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* *WLR_DRM_NO_MODIFIERS*: set to 1 to always allocate planes without modifiers,
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this can fix certain modeset failures because of bandwidth restrictions.
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* *WLR_DRM_FORCE_LIBLIFTOFF*: set to 1 to force libliftoff (by default,
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libliftoff is never used)
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## Headless backend
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* *WLR_HEADLESS_OUTPUTS*: when using the headless backend specifies the number
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of outputs
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## libinput backend
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* *WLR_LIBINPUT_NO_DEVICES*: set to 1 to not fail without any input devices
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## Wayland backend
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* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
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## X11 backend
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* *WLR_X11_OUTPUTS*: when using the X11 backend specifies the number of outputs
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## gles2 renderer
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* *WLR_RENDERER_ALLOW_SOFTWARE*: allows the gles2 renderer to use software
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rendering
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## scenes
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* *WLR_SCENE_DEBUG_DAMAGE*: specifies debug options for screen damage related
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tasks for compositors that use scenes (available options: none, rerender,
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highlight)
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* *WLR_SCENE_DISABLE_DIRECT_SCANOUT*: disables direct scan-out for debugging.
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* *WLR_SCENE_DISABLE_VISIBILITY*: If set to 1, the visibility of all scene nodes
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will be considered to be the full node. Intelligent visibility canculations will
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be disabled.
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* *WLR_SCENE_HIGHLIGHT_TRANSPARENT_REGION*: Highlights regions of scene buffers
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that are advertised as transparent through wlr_scene_buffer_set_opaque_region().
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This can be used to debug issues with clients advertizing bogus opaque regions
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with scene based compositors.
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# Generic
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* *DISPLAY*: if set probe X11 backend in `wlr_backend_autocreate`
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* *WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland backend in
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`wlr_backend_autocreate`
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* *XCURSOR_PATH*: directory where xcursors are located
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* *XDG_SESSION_ID*: if set, session ID used by the logind session
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