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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_have_opengl.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_HAVE_OPENGL
#
# DESCRIPTION
#
# Search for OpenGL. We search first for Mesa (a GPL'ed version of Mesa)
# before a vendor's version of OpenGL, unless we were specifically asked
# not to with `--with-Mesa=no' or `--without-Mesa'.
#
# The four "standard" OpenGL libraries are searched for: "-lGL", "-lGLU",
# "-lGLX" (or "-lMesaGL", "-lMesaGLU" as the case may be) and "-lglut".
#
# All of the libraries that are found (since "-lglut" or "-lGLX" might be
# missing) are added to the shell output variable "GL_LIBS", along with
# any other libraries that are necessary to successfully link an OpenGL
# application (e.g. the X11 libraries). Care has been taken to make sure
# that all of the libraries in "GL_LIBS" are listed in the proper order.
#
# Additionally, the shell output variable "GL_CFLAGS" is set to any flags
# (e.g. "-I" flags) that are necessary to successfully compile an OpenGL
# application.
#
# The following shell variable (which are not output variables) are also
# set to either "yes" or "no" (depending on which libraries were found) to
# help you determine exactly what was found.
#
# have_GL
# have_GLU
# have_GLX
# have_glut
#
# LICENSE
#
# Copyright (c) 2008 Matthew D. Langston
# Copyright (c) 2008 Ahmet Inan <auto@ainan.org>
#
# 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 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.
#serial 4
AU_ALIAS([MDL_HAVE_OPENGL], [AX_HAVE_OPENGL])
AC_DEFUN([AX_HAVE_OPENGL],
[
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PATH_X])
AC_REQUIRE([AC_PATH_XTRA])
AC_CACHE_CHECK([for OpenGL], ax_cv_have_OpenGL,
[
dnl Check for Mesa first, unless we were asked not to.
AC_ARG_WITH([--with-Mesa],
[Prefer the Mesa library over a vendors native OpenGL library (default=yes)],
with_Mesa_help_string)
AC_ARG_ENABLE(Mesa, $with_Mesa_help_string, use_Mesa=$enableval, use_Mesa=yes)
if test x"$use_Mesa" = xyes; then
GL_search_list="MesaGL GL"
GLU_search_list="MesaGLU GLU"
GLX_search_list="MesaGLX GLX"
else
GL_search_list="GL MesaGL"
GLU_search_list="GLU MesaGLU"
GLX_search_list="GLX MesaGLX"
fi
AC_LANG_SAVE
AC_LANG_C
dnl If we are running under X11 then add in the appropriate libraries.
if test x"$no_x" != xyes; then
dnl Add everything we need to compile and link X programs to GL_X_CFLAGS
dnl and GL_X_LIBS.
GL_CFLAGS="$X_CFLAGS"
GL_X_LIBS="$X_PRE_LIBS $X_LIBS -lX11 -lXext -lXmu -lXt -lXi $X_EXTRA_LIBS"
fi
GL_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$GL_CFLAGS"
GL_save_LIBS="$LIBS"
LIBS="$GL_X_LIBS"
# Save the "AC_MSG_RESULT file descriptor" to FD 8.
exec 8>&AC_FD_MSG
# Temporarily turn off AC_MSG_RESULT so that the user gets pretty
# messages.
exec AC_FD_MSG>/dev/null
AC_SEARCH_LIBS(glAccum, $GL_search_list, have_GL=yes, have_GL=no)
AC_SEARCH_LIBS(gluBeginCurve, $GLU_search_list, have_GLU=yes, have_GLU=no)
AC_SEARCH_LIBS(glXChooseVisual, $GLX_search_list, have_GLX=yes, have_GLX=no)
AC_SEARCH_LIBS(glutInit, glut, have_glut=yes, have_glut=no)
# Restore pretty messages.
exec AC_FD_MSG>&8
if test -n "$LIBS"; then
ax_cv_have_OpenGL=yes
GL_LIBS="$LIBS"
AC_SUBST(GL_CFLAGS)
AC_SUBST(GL_LIBS)
else
ax_cv_have_OpenGL=no
GL_CFLAGS=
fi
dnl Reset GL_X_LIBS regardless, since it was just a temporary variable
dnl and we don't want to be global namespace polluters.
GL_X_LIBS=
LIBS="$GL_save_LIBS"
CPPFLAGS="$GL_save_CPPFLAGS"
AC_LANG_RESTORE
dnl bugfix: dont forget to cache this variables, too
ax_cv_GL_CFLAGS="$GL_CFLAGS"
ax_cv_GL_LIBS="$GL_LIBS"
ax_cv_have_GL="$have_GL"
ax_cv_have_GLU="$have_GLU"
ax_cv_have_GLX="$have_GLX"
ax_cv_have_glut="$have_glut"
])
GL_CFLAGS="$ax_cv_GL_CFLAGS"
GL_LIBS="$ax_cv_GL_LIBS"
have_GL="$ax_cv_have_GL"
have_GLU="$ax_cv_have_GLU"
have_GLX="$ax_cv_have_GLX"
have_glut="$ax_cv_have_glut"
])
dnl endof bugfix -ainan
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