#!/bin/bash
# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/x11-base/opengl-update/files/opengl-update-1.7.2,v 1.2 2004/07/15 00:27:54 agriffis Exp $
# Author:  Martin Schlemmer <azarah@gentoo.org>
# Further modifications by Donnie Berkholz <spyderous@gentoo.org>

. /etc/init.d/functions.sh

if [ `id -u` -ne 0 ]
then
	eerror "${0}: must be root."
	exit 1
fi

usage() {
# In addition to the below function, there are two extra uses for this.
#
# They aren't in the printed help message because they're intended
# 	for developer use.
# 1) --use-old $NEW_IMPLEM will switch to the new implementation only if
# 	no old setup existed (i.e., X has never been installed)
# 2) --get-implementation will return the implementation

cat << FOO
usage: ${0##*/} <GL implementation>

note:  
       This utility switches between OpenGL implementations.  Currently there
       are five supported implementations, "xorg-x11" "xfree" "nvidia" "ati"
       and "mtx", the implementations for X.org, XFree86, nVidia, ATi
       and Matrox drivers respectively.

examples:
       ${0##*/} xorg-x11
       This will setup things to use libGL.so from X.org.

       ${0##*/} nvidia
       This will setup things to use libGL.so from the nVidia drivers.
	   
FOO
	exit 1
}

if [ "$#" -ne 1 -a "$#" -ne 2 ] || \
	[ "$#" -eq 2 -a "$1" != "--use-old" ]
then
	usage
fi

GL_IMPLEM=""

# Discover GL implementation if it exists
get_implem() {
	if [ -f /etc/env.d/09opengl ]
	then
		source /etc/env.d/09opengl
		if [ -n "${LDPATH}" ]
		then
			GL_IMPLEM="${LDPATH/\/usr\/lib\/opengl\/}"
			GL_IMPLEM="${GL_IMPLEM/\/lib}"
			unset LDPATH
		fi
	fi
}

# Return current GL implementation
if [ "$1" = "--get-implementation" ]
then
	get_implem
	
	if [ -n "${GL_IMPLEM}" ]
	then
		echo "${GL_IMPLEM}"
	fi

	if [ -z "${GL_IMPLEM}" ]
	then
		exit 2
	fi

	exit 1
fi

# Only use specified implementation if it is not already selected.
if [ "$1" = "--use-old" ]
then
	shift

	get_implem
	
	if [ -z "${GL_IMPLEM}" ]
	then
		GL_IMPLEM="$1"
	fi
else
	GL_IMPLEM="$1"
fi

if [ ! -d /usr/lib/opengl/${GL_IMPLEM} ]
then
	usage
else
	ebegin "Switching to ${GL_IMPLEM} OpenGL interface"

	#setup the $LDPATH
	echo "LDPATH=/usr/lib/opengl/${GL_IMPLEM}/lib" >/etc/env.d/09opengl
	/usr/sbin/env-update &>/dev/null

	#setup the /usr/lib/libGL.so symlink
	if [ -e /usr/lib/libGL.so ]
	then
		rm -f /usr/lib/libGL.so
	fi
	if [ -e /usr/lib/libGL.so.1 ]
	then
		rm -f /usr/lib/libGL.so.1
	fi
	realname="$(readlink /usr/lib/opengl/${GL_IMPLEM}/lib/libGL.so)"
	ln -sf /usr/lib/opengl/${GL_IMPLEM}/lib/${realname} \
		/usr/lib/libGL.so
	ln -sf /usr/lib/opengl/${GL_IMPLEM}/lib/${realname} \
		/usr/lib/libGL.so.1

	#setup the /usr/X11R6/lib/libMesaGL.so symlink
	if [ -e /usr/X11R6/lib/libMesaGL.so ]
	then
		rm -f /usr/X11R6/lib/libMesaGL.so
	fi
	realname="$(readlink /usr/lib/opengl/${GL_IMPLEM}/lib/libGL.so)"
	ln -sf /usr/lib/opengl/${GL_IMPLEM}/lib/${realname} \
		/usr/X11R6/lib/libMesaGL.so

	#setup the /usr/lib/libGLcore.so symlink
	if [ -e /usr/lib/libGLcore.so ]
	then
		rm -f /usr/lib/libGLcore.so
	fi
	if [ -e /usr/lib/libGLcore.so.1 ]
	then
		rm -f /usr/lib/libGLcore.so.1
	fi
	if [ -e /usr/lib/opengl/${GL_IMPLEM}/lib/libGLcore.so ]
	then
		realname="$(readlink /usr/lib/opengl/${GL_IMPLEM}/lib/libGLcore.so)"
		ln -sf /usr/lib/opengl/${GL_IMPLEM}/lib/${realname} \
			/usr/lib/libGLcore.so
		ln -sf /usr/lib/opengl/${GL_IMPLEM}/lib/${realname} \
			/usr/lib/libGLcore.so.1
	fi

	#setup the /usr/lib/libGL.la symlink
	if [ -e /usr/lib/libGL.la ]
	then
		rm -f /usr/lib/libGL.la
	fi
	if [ -e /usr/lib/opengl/${GL_IMPLEM}/lib/libGL.la ]
	then
		ln -sf /usr/lib/opengl/${GL_IMPLEM}/lib/libGL.la \
			/usr/lib/libGL.la
	fi

	#fix libtool archives (#48297)
	CURDIR="$(pwd)"
	cd /usr/lib
	if [ "`grep -l /usr/lib/opengl *.la`" ]
	then
		sed -i 's:/usr/lib/opengl/[^/]*/lib/libGL.la:/usr/lib/libGL.la:' \
			`grep -l /usr/lib/opengl *.la`
	fi
	cd ${CURDIR}

	#setup the /usr/X11R6/lib/modules/extensions/libglx.so symlink
	if [ -e /usr/X11R6/lib/modules/extensions/libglx.so ]
	then
		rm -f /usr/X11R6/lib/modules/extensions/libglx.so
	fi
	if [ -e /usr/lib/opengl/${GL_IMPLEM}/extensions/libglx.so ]
	then
		ln -sf /usr/lib/opengl/${GL_IMPLEM}/extensions/libglx.so \
			/usr/X11R6/lib/modules/extensions/libglx.so
	fi
	#setup the /usr/X11R6/lib/modules/extensions/libglx.a symlink
	if [ -e /usr/X11R6/lib/modules/extensions/libglx.a ]
	then
		rm -f /usr/X11R6/lib/modules/extensions/libglx.a
	fi
	if [ -e /usr/lib/opengl/${GL_IMPLEM}/extensions/libglx.a ]
	then
		ln -sf /usr/lib/opengl/${GL_IMPLEM}/extensions/libglx.a \
			/usr/X11R6/lib/modules/extensions/libglx.a
	fi

	#setup the includes
	for x in gl.h glx.h glxtokens.h
	do
		if [ -e /usr/X11R6/include/GL/${x} ]
		then
			rm -f /usr/X11R6/include/GL/${x}
		fi
		ln -sf /usr/lib/opengl/${GL_IMPLEM}/include/${x} \
			/usr/X11R6/include/GL/${x}
	done

	eend 0
fi


# vim:ts=4