mdl_have_opengl

Search for OpenGL. We search first for Mesa (a GPL'ed version of Mesa) before a vendor's version of OpenGL, unless we were specifically asked not to with `--with-Mesa=no' or `--without-Mesa'.

The four "standard" OpenGL libraries are searched for: "-lGL", "-lGLU", "-lGLX" (or "-lMesaGL", "-lMesaGLU" as the case may be) and "-lglut".

All of the libraries that are found (since "-lglut" or "-lGLX" might be missing) are added to the shell output variable "GL_LIBS", along with any other libraries that are necessary to successfully link an OpenGL application (e.g. the X11 libraries). Care has been taken to make sure that all of the libraries in "GL_LIBS" are listed in the proper order.

Additionally, the shell output variable "GL_CFLAGS" is set to any flags (e.g. "-I" flags) that are necessary to successfully compile an OpenGL application.

The following shell variable (which are not output variables) are also set to either "yes" or "no" (depending on which libraries were found) to help you determine exactly what was found.

   have_GL
   have_GLU
   have_GLX
   have_glut

A complete little toy "Automake `make distcheck'" package of how to use this macro is available at:

   ftp://ftp.slac.stanford.edu/users/langston/autoconf/ac_opengl-0.01.tar.gz

Please note that as the ac_opengl macro and the toy example evolves, the version number increases, so you may have to adjust the above URL accordingly.

minor bugfix by ahmet inan <auto@ainan.org>

AC_DEFUN([MDL_HAVE_OPENGL],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_PATH_X])
  AC_REQUIRE([AC_PATH_XTRA])

  AC_CACHE_CHECK([for OpenGL], mdl_cv_have_OpenGL,
  [
dnl Check for Mesa first, unless we were asked not to.
    AC_ARG_WITH([--with-Mesa],
                   [Prefer the Mesa library over a vendors native OpenGL library (default=yes)],
                   with_Mesa_help_string)
    AC_ARG_ENABLE(Mesa, $with_Mesa_help_string, use_Mesa=$enableval, use_Mesa=yes)

    if test x"$use_Mesa" = xyes; then
       GL_search_list="MesaGL   GL"
      GLU_search_list="MesaGLU GLU"
      GLX_search_list="MesaGLX GLX"
    else
       GL_search_list="GL  MesaGL"
      GLU_search_list="GLU MesaGLU"
      GLX_search_list="GLX MesaGLX"
    fi

    AC_LANG_SAVE
    AC_LANG_C

dnl If we are running under X11 then add in the appropriate libraries.
if test x"$no_x" != xyes; then
dnl Add everything we need to compile and link X programs to GL_X_CFLAGS
dnl and GL_X_LIBS.
  GL_CFLAGS="$X_CFLAGS"
  GL_X_LIBS="$X_PRE_LIBS $X_LIBS -lX11 -lXext -lXmu -lXt -lXi $X_EXTRA_LIBS"
fi
    GL_save_CPPFLAGS="$CPPFLAGS"
    CPPFLAGS="$GL_CFLAGS"

    GL_save_LIBS="$LIBS"
    LIBS="$GL_X_LIBS"


    # Save the "AC_MSG_RESULT file descriptor" to FD 8.
    exec 8>&AC_FD_MSG

    # Temporarily turn off AC_MSG_RESULT so that the user gets pretty
    # messages.
    exec AC_FD_MSG>/dev/null

    AC_SEARCH_LIBS(glAccum,          $GL_search_list, have_GL=yes,   have_GL=no)
    AC_SEARCH_LIBS(gluBeginCurve,   $GLU_search_list, have_GLU=yes,  have_GLU=no)
    AC_SEARCH_LIBS(glXChooseVisual, $GLX_search_list, have_GLX=yes,  have_GLX=no)
    AC_SEARCH_LIBS(glutInit,        glut,             have_glut=yes, have_glut=no)



    # Restore pretty messages.
    exec AC_FD_MSG>&8

    if test -n "$LIBS"; then
      mdl_cv_have_OpenGL=yes
      GL_LIBS="$LIBS"
      AC_SUBST(GL_CFLAGS)
      AC_SUBST(GL_LIBS)
    else
      mdl_cv_have_OpenGL=no
      GL_CFLAGS=
    fi

dnl Reset GL_X_LIBS regardless, since it was just a temporary variable
dnl and we don't want to be global namespace polluters.
    GL_X_LIBS=

    LIBS="$GL_save_LIBS"
    CPPFLAGS="$GL_save_CPPFLAGS"

    AC_LANG_RESTORE
    
dnl bugfix: dont forget to cache this variables, too
    mdl_cv_GL_CFLAGS="$GL_CFLAGS"
    mdl_cv_GL_LIBS="$GL_LIBS"
    mdl_cv_have_GL="$have_GL"
    mdl_cv_have_GLU="$have_GLU"
    mdl_cv_have_GLX="$have_GLX"
    mdl_cv_have_glut="$have_glut"
  ])
  GL_CFLAGS="$mdl_cv_GL_CFLAGS"
  GL_LIBS="$mdl_cv_GL_LIBS"
  have_GL="$mdl_cv_have_GL"
  have_GLU="$mdl_cv_have_GLU"
  have_GLX="$mdl_cv_have_GLX"
  have_glut="$mdl_cv_have_glut"
])
dnl endof bugfix -ainan