#!/bin/bash
wall_dir="${1:?wallpaper directory required}"
img=$(find "$wall_dir" -type f \( -iname "*.jpg" -o -iname "*.jpeg" -o -iname "*.png" \) | shuf -n1)
swaymsg -q output DP-1 adaptive_sync off            # lock screen redraws rarely: fixed 240 Hz
swaylock -f ${img:+-i "$img"}
# once unlocked, turn VRR back on if a game (gamemode) is still running
( while pgrep -x swaylock >/dev/null; do sleep 1; done
  gamemoded -s | grep -q 'is active' && swaymsg -q output DP-1 adaptive_sync on ) &