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# X11_DEVEL()
#
# Check for the presence of the X Window System headers and libraries.
# Sets the CPPFLAGS and LIBS variables as appropriate.
AC_DEFUN([GL_OPTION],
[
AC_REQUIRE([X11_DEVEL])
AC_ARG_ENABLE(gl, [ --enable-gl enable support for OpenGL rendering default=no],
,[enable_gl="no"])
# Store these
OLDLIBS=$LIBS
OLDCPPFLAGS=$CPPFLAGS
if test "$enable_gl" = "yes"; then
AC_CHECK_LIB([GL], [glXGetConfig],
,
[
enable_gl="no"
AC_MSG_WARN([Disabling GL rendering support])
])
fi
if test "$enable_gl" = "yes"; then
CPPFLAGS="$CPPFLAGS $X_CFLAGS"
LIBS="$LIBS $X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS"
AC_MSG_CHECKING([if we can compile with GL])
AC_TRY_LINK(
[
#include <GL/gl.h>
],
[
GLfloat f = 0.0;
glVertex3f(f, f, f);
],
[
AC_MSG_RESULT([yes])
],
[
AC_MSG_RESULT([no])
AC_MSG_WARN([Disabling GL rendering support])
enable_gl="no"
])
GL_CFLAGS=""
GL_LIBS="-lGL"
AC_SUBST(GL_CFLAGS)
AC_SUBST(GL_LIBS)
fi
CPPFLAGS=$OLDCPPFLAGS
LIBS=$OLDLIBS
AC_MSG_CHECKING([if GL support is enabled])
if test "$enable_gl" = "yes"; then
AC_MSG_RESULT([yes])
AC_DEFINE(USE_GL)
else
AC_MSG_RESULT([no])
fi
AM_CONDITIONAL([USE_GL], [test "$enable_gl" = "yes"])
])
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