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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, noop)
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)

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

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