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[AC_REQUIRE([AC_PATH_X])dnl
19AC_REQUIRE([ACX_PTHREAD])dnl
20
21#
22# There isn't a reliable way to know we should use the Apple OpenGL framework
23# without a configure option.  A Mac OS X user may have installed an
24# alternative GL implementation (e.g., Mesa), which may or may not depend on X.
25#
26AC_ARG_WITH([apple-opengl-framework],
27            [AC_HELP_STRING([--with-apple-opengl-framework],
28                            [use Apple OpenGL framework (Mac OS X only)])])
29if test "X$with_apple_opengl_framework" = "Xyes"; then
30  AC_DEFINE([HAVE_APPLE_OPENGL_FRAMEWORK], [1],
31            [Use the Apple OpenGL framework.])
32  GL_LIBS="-framework OpenGL"
33else
34  AC_LANG_PUSH(C)
35
36  AX_LANG_COMPILER_MS
37  if test X$ax_compiler_ms = Xno; then
38    GL_CFLAGS="${PTHREAD_CFLAGS}"
39    GL_LIBS="${PTHREAD_LIBS} -lm"
40  fi
41
42  #
43  # Use x_includes and x_libraries if they have been set (presumably by
44  # AC_PATH_X).
45  #
46  if test "X$no_x" != "Xyes"; then
47    if test -n "$x_includes"; then
48      GL_CFLAGS="-I${x_includes} ${GL_CFLAGS}"
49    fi
50    if test -n "$x_libraries"; then
51      GL_LIBS="-L${x_libraries} -lX11 ${GL_LIBS}"
52    fi
53  fi
54
55  AC_CHECK_HEADERS([windows.h])
56
57  AC_CACHE_CHECK([for OpenGL library], [ax_cv_check_gl_libgl],
58  [ax_cv_check_gl_libgl="no"
59  ax_save_CPPFLAGS="${CPPFLAGS}"
60  CPPFLAGS="${GL_CFLAGS} ${CPPFLAGS}"
61  ax_save_LIBS="${LIBS}"
62  LIBS=""
63  ax_check_libs="-lopengl32 -lGL"
64  for ax_lib in ${ax_check_libs}; do
65    if test X$ax_compiler_ms = Xyes; then
66      ax_try_lib=`echo $ax_lib | sed -e 's/^-l//' -e 's/$/.lib/'`
67    else
68      ax_try_lib="${ax_lib}"
69    fi
70    LIBS="${ax_try_lib} ${GL_LIBS} ${ax_save_LIBS}"
71    AC_LINK_IFELSE(
72    [AC_LANG_PROGRAM([[
73# if HAVE_WINDOWS_H && defined(_WIN32)
74#   include <windows.h>
75# endif
76# include <GL/gl.h>]],
77                     [[glBegin(0)]])],
78    [ax_cv_check_gl_libgl="${ax_try_lib}"; break])
79  done
80  LIBS=${ax_save_LIBS}
81  CPPFLAGS=${ax_save_CPPFLAGS}])
82
83  if test "X${ax_cv_check_gl_libgl}" = "Xno"; then
84    no_gl="yes"
85    GL_CFLAGS=""
86    GL_LIBS=""
87  else
88    GL_LIBS="${ax_cv_check_gl_libgl} ${GL_LIBS}"
89  fi
90  AC_LANG_POP(C)
91fi
92
93AC_SUBST([GL_CFLAGS])
94AC_SUBST([GL_LIBS])
95])dnl
96