#!/bin/sh

if [ -z "${VGL_DISPLAY-}" ]; then
	# Try to use the EGL backend
	for card in /dev/dri/card*; do
		if /opt/VirtualGL/bin/eglinfo -B "${card:?}" 2>/dev/null; then
			export VGL_DISPLAY="${card:?}"
			break
		fi
	done
	# And fallback to DISPLAY if the EGL backend is not available
	if [ -z "${VGL_DISPLAY-}" ] && [ -n "${DISPLAY-}" ]; then
		export VGL_DISPLAY="${DISPLAY:?}"
	fi
fi