Re: [Rd] X11 help please

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Mon, 18 Jun 2007 04:50:53 +0100 (BST)

rgl normally works under Xvfb on Linux: we've been using that for the testing 'for ever'.

However R should not 'crash' on an error in a package, and the X11 device has error handlers set up by

 	XSetErrorHandler(R_X11Err);
 	XSetIOErrorHandler(R_X11IOErr);

I don't see anything comparable in rgl.

The error seems to be in the attributes, so I would have a closer look at those. In particular, how are you running Xvfb?: you may need something like

Xvfb :5 -screen 0 1280x1024x24 &
setenv DISPLAY :5

to ensure that you have a reasonable visual and hence colormap. (On my system the default is 12 bit.)

On Sun, 17 Jun 2007, Duncan Murdoch wrote:

> The rgl package currently crashes R when running under Xvfb (the
> "virtual frame buffer" server), at least on MacOSX. It makes sense that
> it shouldn't be able to work there (it needs interactivity), but I don't
> know how to detect the problems before they cause the crash.
>
> Currently the error happens the first time you try to open an rgl
> window; when rgl calls XCreateWindow R crashes with the error message
>
> X Error of failed request: BadMatch (invalid parameter attributes)
> Major opcode of failed request: 1 (X_CreateWindow)
> Serial number of failed request: 28
> Current serial number in output stream: 29
>
> I've checked and as far as I can see all the parameters we're sending to
> XCreateWindow are valid, but I might have missed something: I don't
> know much about X11 programming. (The call is
>
> ::Window xwindow = XCreateWindow(
> xdisplay, RootWindow(xdisplay, DefaultScreen(xdisplay)),
> 0, 0, 256, 256, 0,
> xvisualinfo->depth,
> InputOutput,
> xvisualinfo->visual,
> valuemask,
> &attrib
> );
>
> but without context that's probably not worth much to others.)
>
>
> Are there any experienced X11 programmers out there who can suggest what
> to do next?
>
> Duncan Murdoch
>
> ______________________________________________
> R-devel_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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