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# ===========================================================================
# http://autoconf-archive.cryp.to/ax_check_gl.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_GL
#
# DESCRIPTION
#
# Check for an OpenGL implementation. If GL is found, the required
# compiler and linker flags are included in the output variables
# "GL_CFLAGS" and "GL_LIBS", respectively. If no usable GL implementation
# is found, "no_gl" is set to "yes".
#
# If the header "GL/gl.h" is found, "HAVE_GL_GL_H" is defined. If the
# header "OpenGL/gl.h" is found, HAVE_OPENGL_GL_H is defined. These
# preprocessor definitions may not be mutually exclusive.
#
# LAST MODIFICATION
#
# 2008-10-07
#
# COPYLEFT
#
# Copyright (c) 2008 Braden McDaniel <braden@endoframe.com>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Macro Archive. When you make and
# distribute a modified version of the Autoconf Macro, you may extend this
# special exception to the GPL to apply to your modified version as well.
AC_DEFUN([AX_CHECK_GL],
[AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([AC_PATH_X])dnl
AC_REQUIRE([ACX_PTHREAD])dnl
AC_LANG_PUSH([C])
AX_LANG_COMPILER_MS
AS_IF([test X$ax_compiler_ms = Xno],
[GL_CFLAGS="${PTHREAD_CFLAGS}"; GL_LIBS="${PTHREAD_LIBS} -lm"])
#
# Use x_includes and x_libraries if they have been set (presumably by
# AC_PATH_X).
#
AS_IF([test "X$no_x" != "Xyes"],
[AS_IF([test -n "$x_includes"],
[GL_CFLAGS="-I${x_includes} ${GL_CFLAGS}"])]
AS_IF([test -n "$x_libraries"],
[GL_LIBS="-L${x_libraries} -lX11 ${GL_LIBS}"]))
ax_save_CPPFLAGS="${CPPFLAGS}"
CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
AC_CHECK_HEADERS([GL/gl.h OpenGL/gl.h])
CPPFLAGS="${ax_save_CPPFLAGS}"
AC_CHECK_HEADERS([windows.h])
m4_define([AX_CHECK_GL_PROGRAM],
[AC_LANG_PROGRAM([[
# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
# include <windows.h>
# endif
# ifdef HAVE_GL_GL_H
# include <GL/gl.h>
# elif defined(HAVE_OPENGL_GL_H)
# include <OpenGL/gl.h>
# else
# error no gl.h
# endif]],
[[glBegin(0)]])])
AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
[ax_cv_check_gl_libgl="no"
case $host_cpu in
x86_64) ax_check_gl_libdir=lib64 ;;
*) ax_check_gl_libdir=lib ;;
esac
ax_save_CPPFLAGS="${CPPFLAGS}"
CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
ax_save_LIBS="${LIBS}"
LIBS=""
ax_check_libs="-lopengl32 -lGL"
for ax_lib in ${ax_check_libs}; do
AS_IF([test X$ax_compiler_ms = Xyes],
[ax_try_lib=`echo $ax_lib | sed -e 's/^-l//' -e 's/$/.lib/'`],
[ax_try_lib="${ax_lib}"])
LIBS="${ax_try_lib} ${GL_LIBS} ${ax_save_LIBS}"
AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
[ax_cv_check_gl_libgl="${ax_try_lib}"; break],
[ax_check_gl_nvidia_flags="-L/usr/${ax_check_gl_libdir}/nvidia" LIBS="${ax_try_lib} ${ax_check_gl_nvidia_flags} ${GL_LIBS} ${ax_save_LIBS}"
AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
[ax_cv_check_gl_libgl="${ax_try_lib} ${ax_check_gl_nvidia_flags}"; break],
[ax_check_gl_dylib_flag='-dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib' LIBS="${ax_try_lib} ${ax_check_gl_dylib_flag} ${GL_LIBS} ${ax_save_LIBS}"
AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
[ax_cv_check_gl_libgl="${ax_try_lib} ${ax_check_gl_dylib_flag}"; break])])])
done
AS_IF([test "X$ax_cv_check_gl_libgl" = Xno -a "X$no_x" = Xyes],
[LIBS='-framework OpenGL'
AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
[ax_cv_check_gl_libgl="$LIBS"])])
LIBS=${ax_save_LIBS}
CPPFLAGS=${ax_save_CPPFLAGS}])
AS_IF([test "X$ax_cv_check_gl_libgl" = Xno],
[no_gl=yes; GL_CFLAGS=""; GL_LIBS=""],
[GL_LIBS="${ax_cv_check_gl_libgl} ${GL_LIBS}"])
AC_LANG_POP([C])
AC_SUBST([GL_CFLAGS])
AC_SUBST([GL_LIBS])
])dnl
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