1dnl @synopsis AX_CHECK_GL
2dnl
3dnl Check for an OpenGL implementation. If GL is found, the required
4dnl compiler and linker flags are included in the output variables
5dnl "GL_CFLAGS" and "GL_LIBS", respectively. This macro adds the
6dnl configure option "--with-apple-opengl-framework", which users can
7dnl use to indicate that Apple's OpenGL framework should be used on Mac
8dnl OS X. If Apple's OpenGL framework is used, the symbol
9dnl "HAVE_APPLE_OPENGL_FRAMEWORK" is defined. If no GL implementation
10dnl is found, "no_gl" is set to "yes".
11dnl
12dnl @category InstalledPackages
13dnl @author Braden McDaniel <braden@endoframe.com>
14dnl @version 2004-11-15
15dnl @license AllPermissive
16
17AC_DEFUN([AX_CHECK_GL],
18[
19
20#
21# There isn't a reliable way to know we should use the Apple OpenGL framework
22# without a configure option.  A Mac OS X user may have installed an
23# alternative GL implementation (e.g., Mesa), which may or may not depend on X.
24#
25AC_ARG_WITH([apple-opengl-framework],
26            [AC_HELP_STRING([--with-apple-opengl-framework],
27                            [use Apple OpenGL framework (Mac OS X only)])])
28if test "X$with_apple_opengl_framework" = "Xyes"; then
29  AC_DEFINE([HAVE_APPLE_OPENGL_FRAMEWORK], [1],
30            [Use the Apple OpenGL framework.])
31  GL_LIBS="-framework OpenGL"
32else
33  AC_REQUIRE([AC_PATH_X])dnl
34  AC_REQUIRE([ACX_PTHREAD])dnl
35
36  AC_LANG_PUSH(C)
37
38  AX_LANG_COMPILER_MS
39  if test X$ax_compiler_ms = Xno; then
40    GL_CFLAGS="${PTHREAD_CFLAGS}"
41    GL_LIBS="${PTHREAD_LIBS} -lm"
42  fi
43
44  #
45  # Use x_includes and x_libraries if they have been set (presumably by
46  # AC_PATH_X).
47  #
48  if test "X$no_x" != "Xyes"; then
49    if test -n "$x_includes"; then
50      GL_CFLAGS="-I${x_includes} ${GL_CFLAGS}"
51    fi
52    if test -n "$x_libraries"; then
53      GL_LIBS="-L${x_libraries} -lX11 ${GL_LIBS}"
54    fi
55  fi
56
57  AC_CHECK_HEADERS([windows.h])
58
59  AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
60  [ax_cv_check_gl_libgl="no"
61  ax_save_CPPFLAGS="${CPPFLAGS}"
62  CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
63  ax_save_LIBS="${LIBS}"
64  LIBS=""
65  ax_check_libs="-lopengl32 -lGL"
66  for ax_lib in ${ax_check_libs}; do
67    if test X$ax_compiler_ms = Xyes; then
68      ax_try_lib=`echo $ax_lib | sed -e 's/^-l//' -e 's/$/.lib/'`
69    else
70      ax_try_lib="${ax_lib}"
71    fi
72    LIBS="${ax_try_lib} ${GL_LIBS} ${ax_save_LIBS}"
73    AC_LINK_IFELSE(
74    [AC_LANG_PROGRAM([[
75# if HAVE_WINDOWS_H && defined(_WIN32)
76#   include <windows.h>
77# endif
78# include <GL/gl.h>]],
79                     [[glBegin(0)]])],
80    [ax_cv_check_gl_libgl="${ax_try_lib}"; break])
81  done
82  LIBS=${ax_save_LIBS}
83  CPPFLAGS=${ax_save_CPPFLAGS}])
84
85  if test "X${ax_cv_check_gl_libgl}" = "Xno"; then
86    no_gl="yes"
87    GL_CFLAGS=""
88    GL_LIBS=""
89  else
90    GL_LIBS="${ax_cv_check_gl_libgl} ${GL_LIBS}"
91  fi
92  AC_LANG_POP(C)
93fi
94
95AC_SUBST([GL_CFLAGS])
96AC_SUBST([GL_LIBS])
97])dnl
98