# punktfunk: headless game-mode fallback for gamescope-session-plus.
#
# Installed as /etc/gamescope-session-plus/sessions.d/steam. The gamescope-session-plus launcher
# SOURCES this (shell, with `set -a` so assignments auto-export) AFTER its /usr/share defaults, so it
# can override the session's gamescope flags.
#
# Why: on a box with NO connected display (a dedicated streaming host), the stock Steam game mode runs
# gamescope's DRM backend against a physical panel (`--prefer-output *,eDP-1`). With nothing to scan
# out, gamescope crashes on launch; after 5 strikes Bazzite/SteamOS force-selects the desktop session
# and "Switch to Game Mode" appears broken. Falling back to gamescope's HEADLESS backend makes game
# mode render entirely offscreen and expose a PipeWire node, which the punktfunk host captures and
# streams — full gamescope game mode (per-game res / FSR / HDR / VRR / frame-limit), no monitor needed.
#
# Safe by construction:
#   * NO-OP when any display is connected -> the normal DRM game mode runs unchanged.
#   * Only sets values that are still unset (`: "${VAR:=...}"`), so the punktfunk host's per-client
#     mode (SCREEN_WIDTH/SCREEN_HEIGHT injected via systemd-run for a managed session) still wins.
if ! grep -qx connected /sys/class/drm/*/status 2>/dev/null; then
    : "${BACKEND:=headless}"
    : "${SCREEN_WIDTH:=1920}"
    : "${SCREEN_HEIGHT:=1080}"
fi