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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_glut.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_GLUT([ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
#
# DESCRIPTION
#
# Checks for GLUT. If a valid GLUT implementation is found, the configure
# script would export the C preprocessor symbol "HAVE_GLUT=1".
#
# If either a valid GLUT header or library was not found, by default the
# configure script would exit on error. This behavior can be overwritten
# by providing a custom "ACTION-IF-NOT-FOUND" hook.
#
# If the header, library was found, and been tested for compiling and
# linking the configuration would export the required compiler flags to
# "GLUT_CFLAGS" and "GLUT_LIBS" environment variables. These two variables
# can also be overwritten by defining the environment variables before
# executing the configure program. If it was predefined, configure would
# not try to overwrite it, but it would still perform the compile and link
# test. Only when the tests succeeded does the configure script to export
# "HAVE_GLUT=1" and to run "ACTION-IF-FOUND" hook.
#
# If user didn't specify the "ACTION-IF-FOUND" hook, the configuration
# would prepend "GLUT_CFLAGS" and "GLUT_LIBS" to "CFLAGS" and "LIBS", like
# many other autoconf macros do.
#
# If the header "GL/glut.h" is found, "HAVE_GL_GLUT_H" is defined. If the
# header "GLUT/glut.h" is found, HAVE_GLUT_GLUT_H is defined.
#
# You should use something like this in your headers:
#
# # if HAVE_WINDOWS_H && defined(_WIN32)
# # include <windows.h>
# # endif
# # if defined(HAVE_GL_GLUT_H)
# # include <GL/glut.h>
# # elif defined(HAVE_GLUT_GLUT_H)
# # include <GLUT/glut.h>
# # else
# # error no glut.h
# # endif
#
# On the OSX platform, you can use the option --with-xquartz-gl to use
# X11/Xquartz GLUT implementation instead of the system built in GLUT
# framework.
#
# LICENSE
#
# Copyright (c) 2009 Braden McDaniel <braden@endoframe.com>
# Copyright (c) 2013 Bastien Roucaries <roucaries.bastien+autoconf@gmail.com>
# Copyright (c) 2016 Felix Chern <idryman@gmail.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 <https://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 17
AC_DEFUN([_AX_CHECK_GLUT_SAVE_FLAGS], [
AX_SAVE_FLAGS_WITH_PREFIX([GLUT],[$1]) dnl defined in ax_check_gl
AC_LANG_PUSH([C])
])
AC_DEFUN([_AX_CHECK_GLUT_RESTORE_FLAGS], [
AX_RESTORE_FLAGS_WITH_PREFIX([GLUT],[$1]) dnl defined in ax_check_gl
AC_LANG_POP([C])
])
dnl Default include : add windows.h
dnl see http://www.opengl.org/wiki/Platform_specifics:_Windows
dnl (acceded 20120801)
AC_DEFUN([_AX_CHECK_GLUT_INCLUDES_DEFAULT],dnl
[
AC_INCLUDES_DEFAULT
[
# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
# include <windows.h>
# endif
]
])
m4_define([_AX_CHECK_GLUT_PROGRAM],
[AC_LANG_PROGRAM([[
# if HAVE_WINDOWS_H && defined(_WIN32)
# include <windows.h>
# endif
# ifdef HAVE_GL_GLUT_H
# include <GL/glut.h>
# elif defined(HAVE_GLUT_GLUT_H)
# include <GLUT/glut.h>
# else
# error no glut.h
# endif]],
[[glutMainLoop()]])])
# _AX_CHECK_GLUT_MANUAL_LIBS_GENERIC(LIST-OF-LIBS)
# ------------------------------------------------
# Searches libraries provided in $1, and export variable
# $ax_check_glut_lib_glut
AC_DEFUN([_AX_CHECK_GLUT_MANUAL_LIBS_GENERIC],
[
_AX_CHECK_GLUT_SAVE_FLAGS([[CFLAGS],[LIBS]])
AC_SEARCH_LIBS([glutMainLoop],[$1],
[GLUT_LIBS="${GLUT_LIBS:-$ac_cv_search_glutMainLoop}"])
_AX_CHECK_GLUT_RESTORE_FLAGS([[CFLAGS],[LIBS]])
])
# Wrapper macro to check GLUT header
AC_DEFUN([_AX_CHECK_GLUT_HEADER],[
_AX_CHECK_GLUT_SAVE_FLAGS([CFLAGS])
AC_CHECK_HEADERS([$1],
[ax_check_glut_have_headers=yes])
_AX_CHECK_GLUT_RESTORE_FLAGS([CFLAGS])
])
# AX_CHECK_GLUT_LIB([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# ---------------------------------------------------------
# Checks GLUT headers and library and provides hooks for success and failures.
AC_DEFUN([AX_CHECK_GLUT],
[AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([_WITH_XQUARTZ_GL])
AC_ARG_VAR([GLUT_CFLAGS],[C compiler flags for GLUT, overriding configure script defaults])
AC_ARG_VAR([GLUT_LIBS],[Linker flags for GLUT, overriding configure script defaults])
AS_CASE([${host}],
[*-darwin*],[AS_IF([test "x$with_xquartz_gl" != "xno"],
[GLUT_LIBS="${GLUT_LIBS:--lGLUT}"],
[GLUT_LIBS="${GLUT_LIBS:--framework GLUT}"])],
[*-cygwin*|*-mingw*],[
_AX_CHECK_GLUT_MANUAL_LIBS_GENERIC([glut32 glut])
AC_CHECK_HEADERS([windows.h])
],
[_AX_CHECK_GLUT_MANUAL_LIBS_GENERIC([glut])
]) dnl host specific checks
dnl checks header
AS_CASE([${host}],
[*-darwin*],[AS_IF([test "x$with_xquartz_gl" = "xno"],
[_AX_CHECK_GLUT_HEADER([GLUT/glut.h])],
[_AX_CHECK_GLUT_HEADER([GL/glut.h])]
)],
[_AX_CHECK_GLUT_HEADER([GL/glut.h])])
dnl compile
AS_IF([test "X$ax_check_glut_have_headers" = "Xyes"],
[AC_CACHE_CHECK([for compiling a minimal GLUT program],
[ax_cv_check_glut_compile],
[_AX_CHECK_GLUT_SAVE_FLAGS([CFLAGS])
AC_COMPILE_IFELSE([_AX_CHECK_GLUT_PROGRAM],
[ax_cv_check_glut_compile="yes"],
[ax_cv_check_glut_compile="no"])
_AX_CHECK_GLUT_RESTORE_FLAGS([CFLAGS])
])
])
dnl link
AS_IF([test "X$ax_cv_check_glut_compile" = "Xyes"],
[AC_CACHE_CHECK([for linking a minimal GLUT program],
[ax_cv_check_glut_link],
[_AX_CHECK_GLUT_SAVE_FLAGS([[CFLAGS],[LIBS]])
AC_LINK_IFELSE([_AX_CHECK_GLUT_PROGRAM],
[ax_cv_check_glut_link="yes"],
[ax_cv_check_glut_link="no"])
_AX_CHECK_GLUT_RESTORE_FLAGS([[CFLAGS],[LIBS]])
])
])
dnl hook
AS_IF([test "X$ax_cv_check_glut_link" = "Xyes"],
[AC_DEFINE([HAVE_GLUT], [1], [Defined if a valid GLUT implementation is found])
m4_ifval([$1],
[$1],
[CFLAGS="$GLUT_CFLAGS $CFLAGS"
LIBS="$GLUT_LIBS $LIBS"])
],
[m4_ifval([$2],
[$2],
[AC_MSG_ERROR([Could not find a valid GLUT implementation])]
)
])
])
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