opengl test macro
This commit is contained in:
Glenn Maynard
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dnl ########################### -*- Mode: M4 -*- #######################
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dnl Copyright (C) 98, 1999 Matthew D. Langston <[email protected]>
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dnl
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dnl This file is free software; you can redistribute it and/or modify it
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dnl under the terms of the GNU General Public License as published by
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dnl the Free Software Foundation; either version 2 of the License, or
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dnl (at your option) any later version.
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dnl
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dnl This file is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU General Public License
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dnl along with this file; if not, write to:
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dnl
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dnl Free Software Foundation, Inc.
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dnl Suite 330
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dnl 59 Temple Place
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dnl Boston, MA 02111-1307, USA.
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dnl ####################################################################
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dnl @synopsis MDL_HAVE_OPENGL
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dnl
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dnl Search for OpenGL. We search first for Mesa (a GPL'ed version of
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dnl OpenGL) before a vendor's version of OpenGL, unless we were
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dnl specifically asked not to with `--with-Mesa=no' or `--without-Mesa'.
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dnl
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dnl The four "standard" OpenGL libraries are searched for: "-lGL",
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dnl "-lGLU", "-lGLX" (or "-lMesaGL", "-lMesaGLU" as the case may be) and
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dnl "-lglut".
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dnl
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dnl All of the libraries that are found (since "-lglut" or "-lGLX" might
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dnl be missing) are added to the shell output variable "GL_LIBS", along
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dnl with any other libraries that are necessary to successfully link an
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dnl OpenGL application (e.g. the X11 libraries). Care has been taken to
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dnl make sure that all of the libraries in "GL_LIBS" are listed in the
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dnl proper order.
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dnl
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dnl Additionally, the shell output variable "GL_CFLAGS" is set to any
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dnl flags (e.g. "-I" flags) that are necessary to successfully compile
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dnl an OpenGL application.
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dnl
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dnl The following shell variable (which are not output variables) are
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dnl also set to either "yes" or "no" (depending on which libraries were
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dnl found) to help you determine exactly what was found.
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dnl
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dnl have_GL
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dnl have_GLU
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dnl have_GLX
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dnl have_glut
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dnl
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dnl A complete little toy "Automake `make distcheck'" package of how to
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dnl use this macro is available at:
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dnl
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dnl ftp://ftp.slac.stanford.edu/users/langston/autoconf/ac_opengl-0.01.tar.gz
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dnl
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dnl Please note that as the ac_opengl macro and the toy example evolves,
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dnl the version number increases, so you may have to adjust the above
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dnl URL accordingly.
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dnl
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dnl @version 0.01 $Id$
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dnl @author Matthew D. Langston <[email protected]>
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AC_DEFUN(MDL_HAVE_OPENGL,
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[
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_PATH_X])
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AC_REQUIRE([AC_PATH_XTRA])
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AC_CACHE_CHECK([for OpenGL], mdl_cv_have_OpenGL,
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[
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dnl Check for Mesa first, unless we were asked not to.
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AC_ARG_ENABLE(Mesa,
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AC_HELP_STRING([--with-Mesa],
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[Prefer the Mesa library over a vendors native OpenGL library (default=yes)]),
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use_Mesa=$enableval, use_Mesa=yes)
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if test x"$use_Mesa" = xyes; then
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GL_search_list="MesaGL GL"
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GLU_search_list="MesaGLU GLU"
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GLX_search_list="MesaGLX GLX"
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else
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GL_search_list="GL MesaGL"
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GLU_search_list="GLU MesaGLU"
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GLX_search_list="GLX MesaGLX"
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fi
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AC_LANG_SAVE
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AC_LANG_C
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dnl If we are running under X11 then add in the appropriate libraries.
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if ! test x"$no_x" = xyes; then
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dnl Add everything we need to compile and link X programs to GL_CFLAGS
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dnl and GL_X_LIBS.
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GL_CFLAGS="$X_CFLAGS"
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GL_X_LIBS="$X_PRE_LIBS $X_LIBS -lX11 -lXext -lXmu -lXt -lXi $X_EXTRA_LIBS"
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fi
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GL_save_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS="$GL_CFLAGS"
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GL_save_LIBS="$LIBS"
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dnl Er. Linking against X isn't needed; it's the linker's job to pull that in
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dnl if needed. Add a test if needed, but definitely don't link it in all the
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dnl time. -glenn
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dnl LIBS="$GL_X_LIBS"
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# Save the "AC_MSG_RESULT file descriptor" to FD 8.
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exec 8>&AC_FD_MSG
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# Temporarily turn off AC_MSG_RESULT so that the user gets pretty
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# messages.
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exec AC_FD_MSG>/dev/null
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AC_SEARCH_LIBS(glAccum, $GL_search_list, have_GL=yes, have_GL=no)
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AC_SEARCH_LIBS(gluBeginCurve, $GLU_search_list, have_GLU=yes, have_GLU=no)
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dnl Don't link stuff we don't need. These should really all be separate tests. -glenn
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dnl AC_SEARCH_LIBS(glXChooseVisual, $GLX_search_list, have_GLX=yes, have_GLX=no)
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dnl AC_SEARCH_LIBS(glutInit, glut, have_glut=yes, have_glut=no)
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# Restore pretty messages.
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exec AC_FD_MSG>&8
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if test -n "$LIBS"; then
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mdl_cv_have_OpenGL=yes
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GL_LIBS="$LIBS"
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AC_SUBST(GL_CFLAGS)
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AC_SUBST(GL_LIBS)
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else
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mdl_cv_have_OpenGL=no
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GL_CFLAGS=
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fi
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dnl Reset GL_X_LIBS regardless, since it was just a temporary variable
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dnl and we don't want to be global namespace polluters.
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GL_X_LIBS=
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LIBS="$GL_save_LIBS"
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CPPFLAGS="$GL_save_CPPFLAGS"
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AC_LANG_RESTORE
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])
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])
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