VMD-L Mailing List

From: Rich Cook (rcook_at_llnl.gov)
Date: Thu Dec 17 2009 - 13:58:45 CST

I agree, that's clear, thanks! I'll pass it on.

On Dec 17, 2009, at 11:29 AM, John Stone wrote:

> Rich,
> See the glXChooseVisual() calls that VMD uses when querying the
> GPU hardware features. The applicable code is in
> OpenGLDisplayDevice.C
> in the function vmd_get_visual(), from line 435 to line 539.
>
> What is going on here is that one of the calls to glXChooseVisual()
> that
> requests a stereoscopic window (the GLX_STEREO parameter), is
> succeeding
> in getting a stereoscopic window even though it apparently should not.
> So far as I know, no Macs with ATI Radeon 9600 graphics chipsets are
> able
> to do stereo, so this combined with the observed behavior your users
> are
> getting is why I believe it to be an error in their GLX
> implementation.
>
> It is also possible that the error is deeper seated, and that it is
> coming
> from the lower level Apple graphics APIs, and the X11 server is just
> an
> innocent victim here, but I doubt it. Unless you get a stereo visual
> when running VMD natively on the Mac, you should not get one when
> running it remotely displaying on that same Mac... You should get the
> same list of VMD OpenGL features in the VMD startup messages when
> using the Mac locally or when remote displaying to it.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
>
> On Thu, Dec 17, 2009 at 11:22:16AM -0800, Rich Cook wrote:
>> You mentioned that Apple's X11 is claiming to have Stereo support
>> when
>> in fact it does not. Can you point me at the part of your code that
>> is getting the bogus information? I'd like to report it as a bug to
>> the XQuartz team so it gets fixed. Thanks
>>
>> /* A function that takes a single integer argument and returns
>> a pointer to a function that takes two integer arguments and
>> returns a floating-point number. */
>> float (*func2(int a))(int, int);
>> Rich Cook
>> rcook_at_llnl.gov
>>
>>
>>
>
> --
> NIH Resource for Macromolecular Modeling and Bioinformatics
> Beckman Institute for Advanced Science and Technology
> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> Email: johns_at_ks.uiuc.edu Phone: 217-244-3349
> WWW: http://*www.*ks.uiuc.edu/~johns/ Fax: 217-244-6078
>

/* A function that takes a single integer argument and returns
    a pointer to a function that takes two integer arguments and
    returns a floating-point number. */
float (*func2(int a))(int, int);
Rich Cook
rcook_at_llnl.gov