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dnl
dnl Check for OpenGL & GLU
dnl
dnl AM_PATH_OPENGL([ACTION IF FOUND [, ACTION IF NOT FOUND]])
dnl
AC_DEFUN([AM_PATH_OPENGL], [
AC_ARG_ENABLE(opengl, AS_HELP_STRING([--disable-opengl], [do not build OpenGL plugin]),
[enableopengl=$enableval],
[enableopengl="yes"]
)
AC_ARG_ENABLE(glu, AS_HELP_STRING([--disable-glu], [build OpenGL plugin without GLU (no verbose errors)]),
[enableglu=$enableval],
[enableglu="yes"]
)
if test x$enableopengl = "xyes"; then
AC_CHECK_LIB(GL, glBegin,
[AC_CHECK_LIB(m, tan,
[AC_CHECK_HEADER(GL/gl.h,
[ac_have_opengl="yes"
OPENGL_LIBS="-lGL -lm"
AC_DEFINE(HAVE_OPENGL,1,[Define this if you have OpenGL support available])
dnl
dnl need to check with some test if this linking with -lGLU actually works...
dnl check for GLU
dnl
if test x$enableglu = "xyes"; then
AC_CHECK_LIB(GLU, gluPerspective,
[AC_CHECK_HEADER(GL/glu.h,
[AC_MSG_CHECKING([if GLU is sane])
ac_save_LIBS="$LIBS"
LIBS="$X_LIBS $XPRE_LIBS $OPENGL_LIBS -lGLU $X_EXTRA_LIBS"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <GL/gl.h>
#include <GL/glu.h>]], [[ gluPerspective(45.0f,1.33f,1.0f,1000.0f); glBegin(GL_POINTS); glEnd(); return 0 ]])],
[ ac_have_glu="yes"
GLU_LIBS="-lGLU"
AC_DEFINE(HAVE_GLU,1,[Define this if you have GLU support available])
AC_MSG_RESULT(yes)],
[ AC_MSG_RESULT(no)
echo "*** GLU doesn't link with GL; GLU is disabled ***"])
LIBS="$ac_save_LIBS"]
)],
[],
[$X_LIBS $X_PRE_LIBS $OPENGL_LIBS -lGLU $X_EXTRA_LIBS]
)
fi
]
)],
[],
[$X_LIBS $X_PRE_LIBS -lGL -lm $X_EXTRA_LIBS]
)],
[],
[$X_LIBS $X_PRE_LIBS $X_EXTRA_LIBS]
)
if test x$ac_have_opengl = "xyes"; then
ac_use_opengl=yes
fi
fi
AC_SUBST(OPENGL_CFLAGS)
AC_SUBST(OPENGL_LIBS)
AC_SUBST(GLU_LIBS)
AM_CONDITIONAL(HAVE_OPENGL, [test x$ac_use_opengl = "xyes"])
dnl result
if test x$ac_use_opengl = "xyes"; then
ifelse([$1], , :, [$1])
else
ifelse([$2], , :, [$2])
fi
])
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