#!/bin/bash
#
# gl-select: select active gl/glx libraries/extensions
#
# Matt Housh <jaeger@morpheus.net>
#

usage() {
	echo "Usage: $0 [xorg|nvidia]"
	exit
}

# if other than a single argument is passed, spit out some help
if [ $# -ne 1 ]
then
	usage
	exit 1
fi

# check for the xorg port; if it's not installed, why is this script even run?
if [ -z "`pkginfo -i | awk '{ print $1 }' | grep ^xorg$`" ]
then
	echo "xorg isn't installed!"
	exit 1
fi

# perform the selection for the following supported gl/glx setups
case "$1" in
	"xorg")
		echo "* xorg gl/glx selected"

		# check for the existence of libglx_so, libGL_so_1_2 and friends
		# if none, nothing is necessary or the backups have been erased
		BACKUPS="/usr/lib/xorg/modules/extensions/libglx_so \
			/usr/lib/xorg/modules/extensions/libGLcore_so \
			/usr/lib/libGL_so_1_2"
		for F in $BACKUPS
		do
			if [ ! -e $F ]
			then
				echo "One or more of the non-xorg gl/glx backup files are missing. This means"
				echo "either you're not using a non-xorg gl/glx setup, in which case nothing"
				echo "needs to be changed, OR your xorg backups are missing, which can be"
				echo "solved by reinstalling the xorg package from ports."
				exit 1
			fi
		done
		# move the xorg backups back into place
		echo -n "libglx "
		rm -f /usr/lib/xorg/modules/extensions/libglx.so
		mv /usr/lib/xorg/modules/extensions/libglx{_so,.so}
		echo -n "libGLcore "
		rm -f /usr/lib/xorg/modules/extensions/libGLcore.so
		mv /usr/lib/xorg/modules/extensions/libGLcore{_so,.so}
		echo -n "libGL "
		mv /usr/lib/libGL{_so_1_2,.so.1.2}
		;;
	"nvidia")
		echo "* nvidia gl/glx selected"

		# is the nvidia port installed?
		if [ -z "`pkginfo -i | awk '{ print $1 }' | grep ^nvidia-x11r7$`" ]
		then
			echo "nvidia-x11r7 port isn't installed!"
			exit 1
		fi

		# get the .so version number
		NV_VER="`pkginfo -i | grep "^nvidia-x11r7 " | awk '{ print $2 }' | cut -d- -f2`"

		# check for the existence of libglx_so and libGL_so_1_2
		# if none, move the xorg stuff out of the way for nvidia's
		if [ ! -e /usr/lib/xorg/modules/extensions/libglx_so -a ! -e \
			/usr/lib/libGL_so_1_2 ]
		then
			echo -n "libglx "
			mv /usr/lib/xorg/modules/extensions/libglx{.so,_so}
			ln -s libglx.so.1.0.$NV_VER \
				/usr/lib/xorg/modules/extensions/libglx.so
			echo -n "libGLcore "
			mv /usr/lib/xorg/modules/extensions/libGLcore{.so,_so}
			ln -s /usr/lib/libGLcore.so.1.0.$NV_VER \
				/usr/lib/xorg/modules/extensions/libGLcore.so
			echo -n "libGL "
			mv /usr/lib/libGL{.so.1.2,_so_1_2}
			rm /usr/lib/libGL.so.1
			# nvidia's library versioning prevents ldconfig from creating
         # libGL.so and libGLcore.so
         [ ! -L /usr/lib/libGL.so ] && \
            ln -sf libGL.so.1.0.$NV_VER /usr/lib/libGL.so
         [ ! -L /usr/lib/libGLcore.so ] && \
            ln -sf libGLcore.so.1.0.$NV_VER /usr/lib/libGLcore.so
		else
			echo "You appear to already be using a non-xorg gl/glx setup. If the"
			echo "one selected isn't the correct one, revert to xorg and then select"
			echo "the correct new setup using 'gl-select xorg; gl-select <new gl/glx>'."
			exit 1
		fi
		;;
	*)
		usage
		;;
esac

/sbin/ldconfig > /dev/null 2>&1

echo "done."

# End of file