#!/bin/sh

error() {
		echo $0: $* >&2
		exit 2
}

xconfig() {
# uses nvidia-xconfig currently since it's actually driver-agnostic;
# probably should switch to something else some day
		for i in $*; do
				[ -z "$i" ] || nvidia-xconfig -s --$i 
		done
}

[ -z "$1" ] && echo "Usage:
$0 enable  =>  enable NVIDIA compositing
$0 disable => disable NVIDIA compositing" && exit 1

# TODO: maybe drop -n?
XDRIVER="`x11setupdrv -d -n | sed 's/^driver name:[[:blank:]]//'`" \
|| error "x11setupdrv failed to get driver name"

#[ "$XDRIVER" = "nvidia" ] || error "unsupported video driver, not nvidia"

which nvidia-xconfig >&/dev/null || error "nvidia-xconfig not found"

case $1 in
enable|on)
		xconfig composite
		[ "$XDRIVER" = "nvidia" ] && xconfig allow-glx-with-composite add-argb-glx-visuals
		;;
disable|off)
		xconfig no-composite
		[ "$XDRIVER" = "nvidia" ] && xconfig no-allow-glx-with-composite no-add-argb-glx-visuals
		;;
*)
		error "unknown option: $1"
		;;
esac