--- /dev/null
+# ===========================================================================
+# http://www.gnu.org/software/autoconf-archive/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", "GL_LIBS", "GL_LDFLAGS", respectively. If no usable GL
+# implementation is found, "no_gl" is set to "yes".
+#
+# You could disable OpenGL using --with-gl=no
+#
+# You could choose a specific OpenGL libs using --with-gl=lib_name
+#
+# Under darwin, cygwin and mingw target you could prefer the OpenGL
+# implementation that link with X setting --with-gl=x or without X support
+# with --with-gl=nox. Notes that this script try to guess the right
+# implementation.
+#
+# 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.
+#
+# You should use something like this in your headers:
+#
+# #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
+#
+# LICENSE
+#
+# Copyright (c) 2009 Braden McDaniel <braden@endoframe.com>
+# Copyright (c) 2012 Bastien Roucaries <roucaries.bastien+autoconf@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 <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 15
+
+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)]])])
+
+dnl Default include : add windows.h
+dnl see http://www.opengl.org/wiki/Platform_specifics:_Windows
+dnl (acceded 20120801)
+AC_DEFUN([_AX_CHECK_GL_INCLUDES_DEFAULT],dnl
+[
+ AC_INCLUDES_DEFAULT
+ [
+ # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
+ # include <windows.h>
+ # endif
+ ]
+])
+
+dnl local save flags
+AC_DEFUN([_AX_CHECK_GL_SAVE_FLAGS],
+[dnl
+ax_check_gl_saved_libs="${LIBS}"
+ax_check_gl_saved_cflags="${CFLAGS}"
+ax_check_gl_saved_cppflags="${CPPFLAGS}"
+ax_check_gl_saved_ldflags="${LDFLAGS}"
+])
+
+dnl local restore flags
+AC_DEFUN([_AX_CHECK_GL_RESTORE_FLAGS],
+[dnl
+LIBS="${ax_check_gl_saved_libs}"
+CFLAGS="${ax_check_gl_saved_cflags}"
+CPPFLAGS="${ax_check_gl_saved_cppflags}"
+LDFLAGS="${ax_check_gl_saved_ldflags}"
+])
+
+# set the varible ax_check_gl_need_x
+# this variable determine if we need opengl that link with X
+# value are default aka try the first library wether if it link or not with x
+# yes that means we need a opengl with x
+# no that means we do not need an opengl with x
+AC_DEFUN([_AX_CHECK_GL_NEED_X],
+[dnl
+ # do not check if empty : allow a subroutine to modify the choice
+ AS_IF([test "X$ax_check_gl_need_x" = "X"],
+ [ax_check_gl_need_x="default"
+ AS_IF([test "X$no_x" = "Xyes"],[ax_check_gl_need_x="no"])
+ AS_IF([test "X$ax_check_gl_want_gl" = "Xnox"],[ax_check_gl_need_x="no"])
+ AS_IF([test "X$ax_check_gl_want_gl" = "Xx"],[ax_check_gl_need_x="yes"])])
+])
+
+# compile the example program
+AC_DEFUN([_AX_CHECK_GL_COMPILE],
+[dnl
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ AC_COMPILE_IFELSE([_AX_CHECK_GL_PROGRAM],
+ [ax_check_gl_compile_opengl="yes"],
+ [ax_check_gl_compile_opengl="no"])
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_POP([C])
+])
+
+# compile the example program (cache)
+AC_DEFUN([_AX_CHECK_GL_COMPILE_CV],
+[dnl
+ AC_CACHE_CHECK([for compiling a minimal OpenGL program],[ax_cv_check_gl_compile_opengl],
+ [_AX_CHECK_GL_COMPILE()
+ ax_cv_check_gl_compile_opengl="${ax_check_gl_compile_opengl}"])
+ ax_check_gl_compile_opengl="${ax_cv_check_gl_compile_opengl}"
+])
+
+# link the example program
+AC_DEFUN([_AX_CHECK_GL_LINK],
+[dnl
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ LIBS="${GL_LIBS} ${LIBS}"
+ LDFLAGS="${GL_LDFLAGS} ${LDFLAGS}"
+ AC_LINK_IFELSE([_AX_CHECK_GL_PROGRAM],
+ [ax_check_gl_link_opengl="yes"],
+ [ax_check_gl_link_opengl="no"])
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_POP([C])
+])
+
+# link the example program (cache)
+AC_DEFUN([_AX_CHECK_GL_LINK_CV],
+[dnl
+ AC_CACHE_CHECK([for linking a minimal OpenGL program],[ax_cv_check_gl_link_opengl],
+ [_AX_CHECK_GL_LINK()
+ ax_cv_check_gl_link_opengl="${ax_check_gl_link_opengl}"])
+ ax_check_gl_link_opengl="${ax_cv_check_gl_link_opengl}"
+])
+
+dnl Check headers manually (default case)
+AC_DEFUN([_AX_CHECK_GL_MANUAL_HEADERS_DEFAULT],
+[AC_REQUIRE([AC_PATH_XTRA])
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ # see comment in _AX_CHECK_GL_INCLUDES_DEFAULT
+ AC_CHECK_HEADERS([windows.h],[],[],[AC_INCLUDES_DEFAULT])
+ # FIXME: use extra cflags
+ AC_CHECK_HEADERS([GL/gl.h],[ax_check_gl_have_headers="yes"],
+ [ax_check_gl_have_headers_headers="no"],
+ [_AX_CHECK_GL_INCLUDES_DEFAULT()])
+ # do not try darwin specific OpenGl/gl.h
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_POP([C])
+])
+
+# darwin headers without X
+AC_DEFUN([_AX_CHECK_GL_MANUAL_HEADERS_DARWIN_NOX],[
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ # FIXME: use -framework opengl as an extra cflags
+ CFLAGS="-framework opengl ${GL_CFLAGS} ${CFLAGS}"
+ AC_CHECK_HEADERS([OpenGL/gl.h],[ax_check_gl_have_headers="yes"],
+ [ax_check_gl_have_headers_headers="no"],
+ [_AX_CHECK_GL_INCLUDES_DEFAULT()])
+ AS_IF([test "X$ax_check_gl_have_headers" = "yes"],
+ [GL_CFLAGS="-framework opengl ${GL_CFLAGS}"])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ AC_LANG_POP([C])
+])
+
+# check header for darwin
+AC_DEFUN([_AX_CHECK_GL_MANUAL_HEADERS_DARWIN],
+[AC_REQUIRE([_AX_CHECK_GL_NEED_X])dnl
+ AS_CASE([$ax_check_gl_need_x],
+ # try to get X libs if possible do not use framework
+ [yes],[_AX_CHECK_GL_MANUAL_HEADERS_DEFAULT()]
+ [no],[_AX_CHECK_GL_MANUAL_HEADERS_DARWIN_NOX()]
+ # per default use framework that will select if possible no_x version
+ [_AX_CHECK_GL_MANUAL_HEADERS_DARWIN_NOX()
+ # if not found set that we need x in order to found the good library
+ AS_IF([test "X$ax_check_gl_have_headers" = "yes"],
+ [ax_check_gl_need_x="no"],
+ [ax_check_gl_need_x="yes"
+ # retry with general test
+ _AX_CHECK_GL_MANUAL_HEADERS_DEFAULT()])
+ ])
+])
+
+dnl Check headers manually: subroutine must set ax_check_gl_have_headers={yes,no}
+AC_DEFUN([_AX_CHECK_GL_MANUAL_HEADERS],
+[AC_REQUIRE([AC_CANONICAL_HOST])
+ AS_CASE([${host}],
+ [*-darwin*],[_AX_CHECK_GL_MANUAL_HEADERS_DARWIN],
+ [_AX_CHECK_GL_MANUAL_HEADERS_DEFAULT()])
+ AC_CACHE_CHECK([for OpenGL headers],[ax_cv_check_gl_have_headers],
+ [ax_cv_check_gl_have_headers="${ax_check_gl_have_headers}"])
+])
+
+# dnl try to found library (generic case)
+# dnl $1 is set to the library to found
+AC_DEFUN([_AX_CHECK_GL_MANUAL_LIBS_GENERIC],
+[dnl
+ ax_check_gl_manual_libs_generic_extra_libs="$1"
+ AS_IF([test "X$ax_check_gl_manual_libs_generic_extra_libs" = "X"],
+ [AC_MSG_ERROR([AX_CHECK_GL_MANUAL_LIBS_GENERIC argument must no be empty])])
+
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ LIBS="${GL_LIBS} ${LIBS}"
+ AC_SEARCH_LIBS([glBegin],[$ax_check_gl_manual_libs_generic_extra_libs],
+ [ax_check_gl_lib_opengl="yes"],
+ [ax_check_gl_lib_opengl="no"])
+ AS_CASE([$ac_cv_search_glBegin],
+ ["none required"],[],
+ [no],[],
+ [GL_LIBS="${ac_cv_search_glBegin} ${GL_LIBS}"])
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_PUSH([C])
+])
+
+# dnl try to found lib under darwin
+# darwin opengl hack
+# see http://web.archive.org/web/20090410052741/http://developer.apple.com/qa/qa2007/qa1567.html
+# and http://web.eecs.umich.edu/~sugih/courses/eecs487/glut-howto/
+AC_DEFUN([_AX_CHECK_GL_MANUAL_LIBS_DARWIN],
+[# ldhack list
+ ldhack1 = "-Wl,-framework,OpenGL"
+ ldhack2 = "-Wl,-dylib_file,/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib"
+ ldhack3 = "$ldhack1,$ldhack2"
+
+ # select hack
+ AS_IF([test "X$ax_check_gl_need_x" = "Xyes"],
+ [# libs already set by -framework cflag
+ darwinlibs=""
+ ldhacks="$ldhack1 $ldhack2 $ldhack3"],
+ [# do not use framework ldflags in case of x version
+ darwinlibs="GL gl MesaGL"
+ ldhack="$ldhack2"])
+
+ ax_check_gl_link_opengl="no"
+ for extralibs in " " $darwinlibs; do
+ for extraldflags in " " ldhacks; do
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ LIBS="$extralibs ${GL_LIBS} ${LIBS}"
+ LDFLAGS="$extraldflags ${GL_LDFLAGS} ${LDFLAGS}"
+ AC_LINK_IFELSE([_AX_CHECK_GL_PROGRAM],
+ [ax_check_gl_link_opengl="yes"],
+ [ax_check_gl_link_opengl="no"])
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_POP([C])
+ AS_IF([test "X$ax_check_gl_link_opengl" = "Xyes"],[break])
+ done;
+ AS_IF([test "X$ax_check_gl_link_opengl" = "Xyes"],[break])
+ done;
+ GL_LIBS="$extralibs ${GL_LIBS}"
+ GL_LDFLAGS="$extraldflags ${GL_LDFLAGS}"
+])
+
+dnl Check library manually: subroutine must set
+dnl $ax_check_gl_lib_opengl={yes,no}
+AC_DEFUN([_AX_CHECK_GL_MANUAL_LIBS],
+[AC_REQUIRE([AC_CANONICAL_HOST])
+ AS_CASE([${host}],
+ [*-darwin*],[_AX_CHECK_GL_MANUAL_LIBS_DARWIN()],
+ # try first cygwin version
+ [*-cygwin*],[_AX_CHECK_GL_MANUAL_LIBS_GENERIC([GL gl MesaGL opengl32])],
+ # try first native
+ [*-mingw*],[_AX_CHECK_GL_MANUAL_LIBS_GENERIC([opengl32 GL gl MesaGL])],
+ [_AX_CHECK_GL_MANUAL_LIBS_GENERIC([GL gl MesaGL])])
+
+ AC_CACHE_CHECK([for OpenGL libraries],[ax_cv_check_gl_lib_opengl],
+ [ax_cv_check_gl_lib_opengl="${ax_check_gl_lib_opengl}"])
+ ax_check_gl_lib_opengl="${ax_cv_check_gl_lib_opengl}"
+])
+
+# manually check aka old way
+AC_DEFUN([_AX_CHECK_GL_MANUAL],
+[AC_REQUIRE([AC_CANONICAL_HOST])dnl
+ AC_REQUIRE([AC_PATH_XTRA])dnl
+
+ no_gl="yes"
+
+ _AX_CHECK_GL_MANUAL_HEADERS()
+ AS_IF([test "X$ax_check_gl_have_headers" = "Xyes"],
+ [_AX_CHECK_GL_COMPILE_CV()],
+ [ax_check_gl_compile_opengl=no])
+
+ AS_IF([test "X$ax_check_gl_compile_opengl" = "Xyes"],
+ [_AX_CHECK_GL_MANUAL_LIBS],
+ [ax_check_gl_lib_opengl=no])
+
+ AS_IF([test "X$ax_check_gl_lib_opengl" = "Xyes"],
+ [_AX_CHECK_GL_LINK_CV()],
+ [ax_check_gl_link_opengl=no])
+
+ AS_IF([test "X$ax_check_gl_link_opengl" = "Xyes"],
+ [no_gl="no"],
+ [no_gl="yes"])
+])dnl
+
+
+# try to test using pkgconfig: set ax_check_gl_pkg_config=no if not found
+AC_DEFUN([_AX_CHECK_GL_PKG_CONFIG],dnl
+[dnl
+ AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+
+ PKG_CHECK_MODULES([GL],[gl],[ax_check_gl_pkg_config=yes],[ax_check_gl_pkg_config=no])
+ AS_IF([test "X$ax_check_gl_pkg_config" = "Xyes"],[
+ # check headers
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ AC_CHECK_HEADERS([windows.h],[],[],[AC_INCLUDES_DEFAULT])
+ AC_CHECK_HEADERS([GL/gl.h OpenGL/gl.h],
+ [ax_check_gl_have_headers="yes";break],
+ [ax_check_gl_have_headers_headers="no"],
+ [_AX_CHECK_GL_INCLUDES_DEFAULT()])
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_POP([C])
+ AC_CACHE_CHECK([for OpenGL headers],[ax_cv_check_gl_have_headers],
+ [ax_cv_check_gl_have_headers="${ax_check_gl_have_headers}"])
+
+ # pkgconfig library are suposed to work ...
+ AS_IF([test "X$ax_cv_check_gl_have_headers" = "Xno"],
+ [AC_MSG_ERROR("Pkgconfig detected OpenGL library has no headers!")])
+
+ _AX_CHECK_GL_COMPILE_CV()
+ AS_IF([test "X$ax_cv_check_gl_compile_opengl" = "Xno"],
+ [AC_MSG_ERROR("Pkgconfig detected opengl library could not be used for compiling minimal program!")])
+
+ _AX_CHECK_GL_LINK_CV()
+ AS_IF([test "X$ax_cv_check_gl_link_opengl" = "Xno"],
+ [AC_MSG_ERROR("Pkgconfig detected opengl library could not be used for linking minimal program!")])
+ ])
+])
+
+# test if gl link with X
+AC_DEFUN([_AX_CHECK_GL_WITH_X],
+[
+ # try if opengl need X
+ AC_LANG_PUSH([C])
+ _AX_CHECK_GL_SAVE_FLAGS()
+ CFLAGS="${GL_CFLAGS} ${CFLAGS}"
+ LIBS="${GL_LIBS} ${LIBS}"
+ LDFLAGS="${GL_LDFLAGS} ${LDFLAGS}"
+ AC_LINK_IFELSE([AC_LANG_CALL([], [glXQueryVersion])],
+ [ax_check_gl_link_implicitly_with_x="yes"],
+ [ax_check_gl_link_implicitly_with_x="no"])
+ _AX_CHECK_GL_RESTORE_FLAGS()
+ AC_LANG_POP([C])
+])
+
+# internal routine: entry point if gl not disable
+AC_DEFUN([_AX_CHECK_GL],[dnl
+ AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+ AC_REQUIRE([AC_PATH_X])dnl
+
+ # does we need X or not
+ _AX_CHECK_GL_NEED_X()
+
+ # try first pkgconfig
+ AC_MSG_CHECKING([for a working OpenGL implementation by pkg-config])
+ AS_IF([test "X${PKG_CONFIG}" = "X"],
+ [ AC_MSG_RESULT([no])
+ ax_check_gl_pkg_config=no],
+ [ AC_MSG_RESULT([yes])
+ _AX_CHECK_GL_PKG_CONFIG()])
+
+ # if no pkgconfig or pkgconfig fail try manual way
+ AS_IF([test "X$ax_check_gl_pkg_config" = "Xno"],
+ [_AX_CHECK_GL_MANUAL()],
+ [no_gl=no])
+
+
+ # test if need to test X compatibility
+ AS_IF([test $no_gl = no],
+ [# test X compatibility
+ AS_IF([test X$ax_check_gl_need_x != "Xdefault"],
+ [AC_CACHE_CHECK([wether OpenGL link implictly with X],[ax_cv_check_gl_link_with_x],
+ [_AX_CHECK_GL_WITH_X()
+ ax_cv_check_gl_link_with_x="${ax_check_gl_link_implicitly_with_x}"])
+ AS_IF([test "X${ax_cv_check_gl_link_with_x}" = "X${ax_check_gl_need_x}"],
+ [no_gl="no"],
+ [no_gl=yes])])
+ ])
+])
+
+# ax_check_gl entry point
+AC_DEFUN([AX_CHECK_GL],
+[AC_REQUIRE([AC_PATH_X])dnl
+
+ AC_ARG_WITH([gl],
+ [AS_HELP_STRING([--with-gl@<:@=ARG@:>@],
+ [use opengl (ARG=yes),
+ using the specific lib (ARG=<lib>),
+ using the OpenGL lib that link with X (ARG=x),
+ using the OpenGL lib that link without X (ARG=nox),
+ or disable it (ARG=no)
+ @<:@ARG=yes@:>@ ])],
+ [
+ AS_CASE(["$withval"],
+ ["no"|"NO"],[ax_check_gl_want_gl="no"],
+ ["yes"|"YES"],[ax_check_gl_want_gl="yes"],
+ [ax_check_gl_want_gl="$withval"])
+ ],
+ [ax_check_gl_want_gl="yes"])
+
+ # check consistency of parameters
+ AS_IF([test "X$have_x" = "Xdisabled"],
+ [AS_IF([test X$ax_check_gl_want_gl = "Xx"],
+ [AC_MSG_ERROR([You prefer OpenGL with X and asked for no X support])])])
+
+ # set flags
+ no_gl="yes"
+
+ # now do the real testing
+ AS_IF([test X$ax_check_gl_want_gl != "Xno"],
+ [_AX_CHECK_GL()])
+
+ AC_MSG_CHECKING([for a working OpenGL implementation])
+ AS_IF([test "X$no_gl" = "Xno"],
+ [AC_MSG_RESULT([yes])
+ AC_MSG_CHECKING([for CFLAGS needed for OpenGL])
+ AC_MSG_RESULT(["${GL_CFLAGS}"])
+ AC_MSG_CHECKING([for LIBS needed for OpenGL])
+ AC_MSG_RESULT(["${GL_LIBS}"])
+ AC_MSG_CHECKING([for LDFLAGS needed for OpenGL])
+ AC_MSG_RESULT(["${GL_LDFLAGS}"])],
+ [AC_MSG_RESULT([no])
+ GL_CFLAGS=""
+ GL_LIBS=""
+ GL_LDFLAGS=""])
+
+ AC_SUBST([GL_CFLAGS])
+ AC_SUBST([GL_LIBS])
+ AC_SUBST([GL_LDFLAGS])
+])
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