1 # -*- mode: autoconf -*-
5 # Check for an OpenGL implementation. If GL is found, the required compiler
6 # and linker flags are included in the output variables "GL_CFLAGS" and
7 # "GL_LIBS", respectively. If no usable GL implementation is found, "no_gl"
10 # If the header "GL/gl.h" is found, "HAVE_GL_GL_H" is defined. If the header
11 # "OpenGL/gl.h" is found, HAVE_OPENGL_GL_H is defined. These preprocessor
12 # definitions may not be mutually exclusive.
15 # author: Braden McDaniel <braden@endoframe.com>
17 # This program is free software; you can redistribute it and/or modify
18 # it under the terms of the GNU General Public License as published by
19 # the Free Software Foundation; either version 2, or (at your option)
22 # This program is distributed in the hope that it will be useful,
23 # but WITHOUT ANY WARRANTY; without even the implied warranty of
24 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 # GNU General Public License for more details.
27 # You should have received a copy of the GNU General Public License
28 # along with this program; if not, write to the Free Software
29 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
32 # As a special exception, the you may copy, distribute and modify the
33 # configure scripts that are the output of Autoconf when processing
34 # the Macro. You need not follow the terms of the GNU General Public
35 # License when using or distributing such scripts.
37 AC_DEFUN([AX_CHECK_GL],
38 [AC_REQUIRE([AC_CANONICAL_HOST])dnl
39 AC_REQUIRE([AC_PATH_X])dnl
40 AC_REQUIRE([AC_PROG_SED])dnl
41 AC_REQUIRE([AX_PTHREAD])dnl
45 AS_IF([test X$ax_compiler_ms = Xno],
46 [GL_CFLAGS="${PTHREAD_CFLAGS}"; GL_LIBS="${PTHREAD_LIBS}"])
49 # Use x_includes and x_libraries if they have been set (presumably by
52 AS_IF([test X$no_x != Xyes -a -n "$x_includes"],
53 [GL_CFLAGS="-I$x_includes $GL_CFLAGS"])
55 AC_CHECK_HEADERS([windows.h])
57 ax_save_CPPFLAGS=$CPPFLAGS
58 CPPFLAGS="$GL_CFLAGS $CPPFLAGS"
59 AC_CHECK_HEADERS([GL/gl.h OpenGL/gl.h], , , [
60 # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
64 CPPFLAGS=$ax_save_CPPFLAGS
66 m4_define([AX_CHECK_GL_PROGRAM],
68 # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
73 # elif defined(HAVE_OPENGL_GL_H)
74 # include <OpenGL/gl.h>
80 m4_define([AX_CHECK_GL_GLX_PROGRAM],
82 # if defined(HAVE_WINDOWS_H) && defined(_WIN32)
87 # elif defined(HAVE_OPENGL_GL_H)
88 # include <OpenGL/gl.h>
92 [[glXQueryVersion(0, 0, 0)]])])
94 AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
95 [ax_cv_check_gl_libgl=no
97 x86_64) ax_check_gl_libdir=lib64 ;;
98 *) ax_check_gl_libdir=lib ;;
100 ax_save_CPPFLAGS=$CPPFLAGS
101 CPPFLAGS="$CPPFLAGS $GL_CFLAGS"
102 ax_save_LDFLAGS=$LDFLAGS
103 AS_IF([test X$no_x != Xyes -a -n "$x_libraries"],
104 [LDFLAGS="$LDFLAGS -L$x_libraries"])
106 ax_check_libs="-lopengl32 -lGL"
107 for ax_lib in $ax_check_libs; do
108 AS_IF([test X$ax_compiler_ms = Xyes],
109 [ax_try_lib=`echo $ax_lib | $SED -e 's/^-l//' -e 's/$/.lib/'`],
110 [ax_try_lib=$ax_lib])
111 LDFLAGS="$ax_save_LDFLAGS $GL_LIBS"
112 LIBS="$ax_try_lib $ax_save_LIBS"
113 AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
114 [ax_cv_check_gl_libgl=$ax_try_lib; break],
115 [ax_check_gl_nvidia_flags="-L/usr/$ax_check_gl_libdir/nvidia"
116 LDFLAGS="$ax_save_LDFLAGS $GL_LIBS $ax_check_gl_nvidia_flags"
117 AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
118 [ax_cv_check_gl_libgl="$ax_check_gl_nvidia_flags $ax_try_lib"; break],
119 [ax_check_gl_dylib_flag='-dylib_file /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib:/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib'
120 LDFLAGS="$ax_save_LDFLAGS $GL_LIBS $ax_check_gl_dylib_flag"
121 AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
122 [ax_cv_check_gl_libgl="$ax_check_gl_dylib_flag $ax_try_lib"; break])])])
126 # If no_x is "yes", we don't want to wind up using a libGL that is
127 # linked with X11. Test to see if the found libGL includes GLX
128 # functions. If it does and no_x is "yes", we want to reset
129 # ax_cv_check_gl_libgl back to "no".
131 # Note that LDFLAGS and LIBS should still have whatever values they
132 # had when we broke out of the test loop above; use that.
134 AS_IF([test "X$ax_cv_check_gl_libgl" != Xno],
135 [AC_LINK_IFELSE([AX_CHECK_GL_GLX_PROGRAM],
136 [AS_IF([test X$no_x = Xyes],
137 [ax_cv_check_gl_libgl=no])])])
140 AS_IF([test "X$ax_cv_check_gl_libgl" = Xno -a X$no_x = Xyes],
141 [LDFLAGS="$ax_save_LDFLAGS -framework OpenGL"
142 AC_LINK_IFELSE([AX_CHECK_GL_PROGRAM],
143 [ax_cv_check_gl_libgl='-framework OpenGL'])])
145 LDFLAGS=$ax_save_LDFLAGS
146 CPPFLAGS=$ax_save_CPPFLAGS])
148 AS_IF([test "X$ax_cv_check_gl_libgl" = Xno],
149 [no_gl=yes; GL_CFLAGS=""; GL_LIBS=""],
150 [GL_LIBS="$ax_cv_check_gl_libgl $GL_LIBS"])
153 AC_SUBST([GL_CFLAGS])