dnl FTGL_CHECK_GL()
dnl Check for OpenGL development environment and GLU >= 1.2
dnl
AC_DEFUN([FTGL_CHECK_GL],
[dnl
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PATH_X])
AC_REQUIRE([AC_PATH_XTRA])
AC_ARG_WITH([--with-gl-inc],
AC_HELP_STRING([--with-gl-inc=DIR],[Directory where GL/gl.h is installed]))
AC_ARG_WITH([--with-gl-lib],
AC_HELP_STRING([--with-gl-lib=DIR],[Directory where OpenGL libraries are installed]))
AC_LANG_SAVE
AC_LANG_C
GL_SAVE_CPPFLAGS="$CPPFLAGS"
GL_SAVE_LIBS="$LIBS"
if test "x$no_x" != xyes ; then
GL_CFLAGS="$X_CFLAGS"
GL_X_LIBS="$X_PRE_LIBS $X_LIBS -lX11 -lXext -lXmu $X_EXTRA_LIBS"
fi
if test "x$with_gl_inc" != "xnone" ; then
if test -d "$with_gl_inc" ; then
GL_CFLAGS="-I$with_gl_inc"
else
GL_CFLAGS="$with_gl_inc"
fi
else
GL_CFLAGS=
fi
CPPFLAGS="$GL_CFLAGS"
AC_CHECK_HEADER([GL/gl.h], [], [AC_MSG_ERROR(GL/gl.h is needed, please specify its location with --with-gl-inc. If this still fails, please contact mmagallo@debian.org, include the string FTGL somewhere in the subject line and provide a copy of the config.log file that was left behind.)])
AC_MSG_CHECKING([for GL library])
if test "x$with_gl_lib" != "x" ; then
if test -d "$with_gl_lib" ; then
LIBS="-L$with_gl_lib -lGL"
else
LIBS="$with_gl_lib"
fi
else
LIBS="-lGL"
fi
AC_LINK_IFELSE([AC_LANG_CALL([],[glBegin])],[HAVE_GL=yes], [HAVE_GL=no])
if test "x$HAVE_GL" = xno ; then
if test "x$GL_X_LIBS" != x ; then
LIBS="-lGL $GL_X_LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([],[glBegin])],[HAVE_GL=yes], [HAVE_GL=no])
fi
fi
if test "x$HAVE_GL" = xyes ; then
AC_MSG_RESULT([yes])
GL_LIBS=$LIBS
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([GL library could not be found, please specify its location with --with-gl-lib. If this still fails, please contact mmagallo@debian.org, include the string FTGL somewhere in the subject line and provide a copy of the config.log file that was left behind.])
fi
AC_CHECK_HEADER([GL/glu.h])
AC_MSG_CHECKING([for GLU version >= 1.2])
AC_TRY_COMPILE([#include <GL/glu.h>], [
#if !defined(GLU_VERSION_1_2)
#error GLU too old
#endif
],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])
AC_MSG_ERROR([GLU >= 1.2 is needed to compile this library])
])
AC_MSG_CHECKING([for GLU library])
LIBS="-lGLU $GL_LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([],[gluNewTess])],[HAVE_GLU=yes], [HAVE_GLU=no])
if test "x$HAVE_GLU" = xno ; then
if test "x$GL_X_LIBS" != x ; then
LIBS="-lGLU $GL_LIBS $GL_X_LIBS"
AC_LINK_IFELSE([AC_LANG_CALL([],[gluNewTess])],[HAVE_GLU=yes], [HAVE_GLU=no])
fi
fi
if test "x$HAVE_GLU" = xyes ; then
AC_MSG_RESULT([yes])
GL_LIBS="$LIBS"
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([GLU library could not be found, please specify its location with --with-gl-lib. If this still fails, please contact mmagallo@debian.org, include the string FTGL somewhere in the subject line and provide a copy of the config.log file that was left behind.])
fi
AC_SUBST(GL_CFLAGS)
AC_SUBST(GL_LIBS)
CPPFLAGS="$GL_SAVE_CPPFLAGS"
LIBS="$GL_SAVE_LIBS"
AC_LANG_RESTORE
GL_X_LIBS=""
])
