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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_glu.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_GLU([ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
#
# DESCRIPTION
#
# Checks for GLUT. If a valid GLU implementation is found, the configure
# script would export the C preprocessor symbol "HAVE_GLU=1".
#
# If either a valid GLU 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
# "GLU_CFLAGS" and "GLU_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_GLU=1" and to run "ACTION-IF-FOUND" hook.
#
# If user didn't specify the "ACTION-IF-FOUND" hook, the configuration
# would prepend "GLU_CFLAGS" and "GLU_LIBS" to "CFLAGS" and "LIBS", like
# many other autoconf macros do.
#
# If the header "GL/glu.h" is found, "HAVE_GL_GLU_H" is defined. If the
# header "OpenGL/glu.h" is found, HAVE_OPENGL_GLU_H is defined.
#
# You should use something like this in your headers:
#
# # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
# # include <windows.h>
# # endif
# # if defined(HAVE_GL_GLU_H)
# # include <GL/glu.h>
# # elif defined(HAVE_OPENGL_GLU_H)
# # include <OpenGL/glu.h>
# # else
# # error no glu.h
# # endif
#
# On the OSX platform, you can use the option --with-xquartz-gl to use
# X11/Xquartz GLU implementation instead of the system built in GLU
# framework.
#
# Some implementations (in particular, some versions of Mac OS X) are
# known to treat the GLU tesselator callback function type as "GLvoid
# (*)(...)" rather than the standard "GLvoid (*)()". If the former
# condition is detected, this macro defines "HAVE_VARARGS_GLU_TESSCB".
#
# 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 23
# example program
m4_define([_AX_CHECK_GLU_PROGRAM],
[AC_LANG_PROGRAM([[
# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
# include <windows.h>
# endif
# ifdef HAVE_GL_GLU_H
# include <GL/glu.h>
# elif defined(HAVE_OPENGL_GLU_H)
# include <OpenGL/glu.h>
# else
# error no glu.h
# endif
]],[[gluBeginCurve(0)]])])
dnl Default include : add windows.h
dnl see http://www.opengl.org/wiki/Platform_specifics:_Windows
dnl (acceded 20120801)
AC_DEFUN([_AX_CHECK_GLU_INCLUDES_DEFAULT],dnl
[
AC_INCLUDES_DEFAULT
[
# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
# include <windows.h>
# endif
]
])
# check tesselation callback function signature.
m4_define([_AX_CHECK_GLU_VARARGS_TESSVB_PROGRAM],
[AC_LANG_PROGRAM([[
# if defined(HAVE_WINDOWS_H) && defined(_WIN32)
# include <windows.h>
# endif
# ifdef HAVE_GL_GLU_H
# include <GL/glu.h>
# elif defined(HAVE_OPENGL_GLU_H)
# include <OpenGL/glu.h>
# else
# error no glu.h
# endif
]],
[[GLvoid (*func)(...); gluTessCallback(0, 0, func)]])
])
# _AX_CHECK_GLU_SAVE_FLAGS(LIST-OF-FLAGS,[LANG])
# ----------------------------------------------
# Save the flags to shell variables.
# Example: _AX_CHECK_GLU_SAVE_FLAGS([[CFLAGS],[LIBS]]) expands to
# AC_LANG_PUSH([C])
# glu_saved_flag_cflags=$CFLAGS
# glu_saved_flag_libs=$LIBS
# CFLAGS="$GLU_CFLAGS $CFLAGS"
# LIBS="$GLU_LIBS $LIBS"
#
# Can optionally support other LANG by specifying $2
AC_DEFUN([_AX_CHECK_GLU_SAVE_FLAGS], [
m4_ifval([$2],
[AC_LANG_PUSH([$2])],
[AC_LANG_PUSH([C])])
AX_SAVE_FLAGS_WITH_PREFIX([GLU],[$1]) dnl defined in ax_check_gl
])
# _AX_CHECK_GLU_RESTORE_FLAGS(LIST-OF-FLAGS)
# Use this marcro to restore the flags you saved using
# _AX_CHECK_GLU_SAVE_FLAGS
#
# Example: _AX_CHECK_GLU_RESTORE_FLAGS([[CFLAGS],[LIBS]]) expands to
# CFLAGS="$glu_saved_flag_cflags"
# LIBS="$glu_saved_flag_libs"
# AC_LANG_POP([C])
AC_DEFUN([_AX_CHECK_GLU_RESTORE_FLAGS], [
AX_RESTORE_FLAGS_WITH_PREFIX([GLU],[$1]) dnl defined in ax_check_gl
m4_ifval([$2],
[AC_LANG_POP([$2])],
[AC_LANG_POP([C])])
])
# Search headers and export $ax_check_glu_have_headers
AC_DEFUN([_AX_CHECK_GLU_HEADERS], [
_AX_CHECK_GLU_SAVE_FLAGS([CFLAGS])
AC_CHECK_HEADERS([$1],
[ax_check_glu_have_headers="yes";],
[],
[_AX_CHECK_GLU_INCLUDES_DEFAULT()])
_AX_CHECK_GLU_RESTORE_FLAGS([CFLAGS])
])
# _AX_CHECK_GLU_SEARCH_LIBS(LIBS)
# -------------------------------
# Search for a valid GLU lib from $1 and set
# GLU_LIBS respectively
AC_DEFUN([_AX_CHECK_GLU_SEARCH_LIBS], [
_AX_CHECK_GLU_SAVE_FLAGS([[CFLAGS],[LIBS]])
AC_SEARCH_LIBS([gluBeginCurve],[$1],
[GLU_LIBS="${GLU_LIBS:-$ac_cv_search_gluBeginCurve}"])
_AX_CHECK_GLU_RESTORE_FLAGS([[CFLAGS],[LIBS]])
])
# OSX specific GLU checks
AC_DEFUN([_AX_CHECK_DARWIN_GLU], [
AC_REQUIRE([_WITH_XQUARTZ_GL])
AS_IF([test "x$with_xquartz_gl" != "xno"],
[GLU_LIBS="${GLU_LIBS:--lGLU}"],
[GLU_LIBS="${GLU_LIBS:--framework OpenGL}"])
])
# AX_CHECK_GLU([ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
# -----------------------------------------------------
# Checks GLU and provides hooks for success and failures
AC_DEFUN([AX_CHECK_GLU],[
AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([_WITH_XQUARTZ_GL])
AC_REQUIRE([PKG_PROG_PKG_CONFIG])
AC_ARG_VAR([GLU_CFLAGS],[C compiler flags for GLU, overriding system check])
AC_ARG_VAR([GLU_LIBS],[Linker flags for GLU, overriding system check])
dnl Setup GLU_CFLAGS and GLU_LIBS
AS_CASE([${host}],
[*-darwin*],[_AX_CHECK_DARWIN_GLU],
[*-cygwin*],[_AX_CHECK_GLU_SEARCH_LIBS([GLU glu MesaGLU glu32])
AC_CHECK_HEADERS([windows.h])],
# try first native
[*-mingw*],[_AX_CHECK_GLU_SEARCH_LIBS([glu32 GLU glu MesaGLU])
AC_CHECK_HEADERS([windows.h])],
[PKG_PROG_PKG_CONFIG
PKG_CHECK_MODULES([GLU],[glu],
[],
[_AX_CHECK_GLU_SEARCH_LIBS([GLU glu MesaGLU])])
])
AS_CASE([$host],
[*-darwin*],
[AS_IF([test "X$with_xquartz_gl" = "Xno"],
[_AX_CHECK_GLU_HEADERS([OpenGL/glu.h])],
[_AX_CHECK_GLU_HEADERS([GL/glu.h])]
)],
[_AX_CHECK_GLU_HEADERS([GL/glu.h])])
dnl compile test
AS_IF([test "X$ax_check_glu_have_headers" = "Xyes"],
[AC_CACHE_CHECK([for compiling a minimal OpenGL Utility (GLU) program],
[ax_cv_check_glu_compile],
[_AX_CHECK_GLU_SAVE_FLAGS([CFLAGS])
AC_COMPILE_IFELSE([_AX_CHECK_GLU_PROGRAM],
[ax_cv_check_glu_compile="yes"],
[ax_cv_check_glu_compile="no"])
_AX_CHECK_GLU_RESTORE_FLAGS([CFLAGS])])
])
dnl link test
AS_IF([test "X$ax_cv_check_glu_compile" = "Xyes"],
[AC_CACHE_CHECK([for linking a minimal GLU program],
[ax_cv_check_glu_link],
[_AX_CHECK_GLU_SAVE_FLAGS([[CFLAGS],[LIBS]])
AC_LINK_IFELSE([_AX_CHECK_GLU_PROGRAM],
[ax_cv_check_glu_link="yes"],
[ax_cv_check_glu_link="no"])
_AX_CHECK_GLU_RESTORE_FLAGS([[CFLAGS],[LIBS]])])
])
#
# Some versions of Mac OS X include a broken interpretation of the GLU
# tesselation callback function signature.
AS_IF([test "X$ax_cv_check_glu_link" = "Xyes"],
[AC_CACHE_CHECK([if GLU varargs tesselator is using non-standard form],
[ax_cv_varargs_glu_tesscb],
[_AX_CHECK_GLU_SAVE_FLAGS([CFLAGS],[C++])
AC_COMPILE_IFELSE([_AX_CHECK_GLU_VARARGS_TESSVB_PROGRAM],
[ax_cv_varargs_glu_tesscb="yes"],
[ax_cv_varargs_glu_tesscb="no"])
_AX_CHECK_GLU_RESTORE_FLAGS([CFLAGS],[C++])])
AS_IF([test "X$ax_cv_varargs_glu_tesscb" = "yes"],
[AC_DEFINE([HAVE_VARARGS_GLU_TESSCB], [1],
[Use nonstandard varargs form for the GLU tesselator callback])])
])
dnl hook
AS_IF([test "X$ax_cv_check_glu_link" = "Xyes"],
[AC_DEFINE([HAVE_GLU],[1],[Defined if a valid GLU implementation is found.])
m4_ifval([$1],
[$1],
[CFLAGS="$GLU_CFLAGS $CFLAGS"
LIBS="$GLU_LIBS $LIBS"])],
[m4_ifval([$2],
[$2],
[AC_MSG_ERROR([Could not find a valid GLU implementation])])
])
])
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