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Add optional headless fallback output

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This allows configuring a headless fallback output that
is automatically created whenever there is no other output
around. It is destroyed when a new output is discovered.

It can be enabled by setting the environment variable
LABWC_FALLBACK_OUTPUT to the desired output name.

The feature benefits applications like wayvnc the most
as there is always an output available to connect to.

Co-Authored-By: Simon Long <simon@raspberrypi.com>
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Consolatis 2024-03-07 02:11:46 +01:00
parent e00f7cd6db
commit 60aab98e8d
5 changed files with 63 additions and 1 deletions
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15
docs/environment
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@ -68,3 +68,18 @@
# XDG_CURRENT_DESKTOP=wlroots
##
## This causes a virtual output to be created automatically whenever there
## are no outputs around. This helps for cases like wayvnc so there is always
## an output available to connect to. The name can be chosen freely but there
## must be no duplicate output names, for this reason using VIRTUAL-x or a
## physical connector name like HDMI-A-1 is not recommended as wlroots may
## want to create outputs with those names later on which would then fail.
##
## Using an output name that starts with NOOP- has the additional benefit
## that wayvnc will detect it being a virtual output and allow clients to
## resize the output to match the client resolution.
##
# LABWC_FALLBACK_OUTPUT=NOOP-fallback