Re: Possible XFree86-DRI solution and a different display problem

• To: Kevin Manross <kevin.manross@xxxxxxxx>
• Subject: Re: Possible XFree86-DRI solution and a different display problem
• From: Bill Hibbard <billh@xxxxxxxxxxxxx>
• Date: Wed, 12 Nov 2003 17:15:43 -0600 (CST)

Hi Kevin,

First, thanks for your advice about XFree86.

> OK, enough with that ramble and onto another (shorter) one.  About half
> the time when I load my app, I get what I call a "squat-bug".  You can
> see an example here:
>
> http://www.cimms.ou.edu/~kmanross/VCPRPE/squat-bug.gif
>
> The image does not fill the VisAD display area (white square).  The
> other half of the time it works correctly, filling the whole area.  I'm
> not sure what is causing this, except that the rings, line and dots are
> created in a separate class than the terrain image.
>
> I would be very grateful for any help on this and would be happy to
> provide some code if needed.

This is very likely a problem (e.g., a race condition) with
calls to ScalarMap.SetRange(), particularly for the ScalarMap
to YAxis. Assuming you are running VisAD from compiled source,
your might uncomment the print statement at lines 715-716
of ScalarMap.java. I would expect that you'll see differences
in the order of calls for the ScalarMap to YAxis, between the
times your app works correctly and the times it fails. You
might also replace "System.out.println" in this call by
"DisplayImpl.printStack", which will show the stack at calls
to setRange(). Feel free to send a message to the list with
the output.

Cheers,
Bill

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    • From: Kevin Manross

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  • Possible XFree86-DRI solution and a different display problem
    • From: Kevin Manross