Re: X, backingstore and opengl

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

Angelo Graziosi wrote:
> Jon TURNEY wrote:
>
> > I'm sorry, your our previous mail hadn't really made it clear to me 
> > that there was problem with glxgears etc.
> >
> > Just for my comprehension, can you explain again what happens if you 
> > run glxinfo and glxgears on 1.5.3-4.
>
> Really, in my posts, I never cited 'glxgears', 'glxinfo' etc.
> Sincerely, I do not know what they are...

Ah, I'm sorry.  By "OpenGL demos" you mean the ones which come with ROOT.

glxgears, glxinfo are GL demo programs which come with mesa (the OpenGL library)

It would be useful if you could install the mesa package and check if glxinfo, 
glxgears work for you.

> I have written:
>
> 1. Adding +bs at command line which starts XWin (in startxwin.bat) and
> then trying to run some ROOT macro (hsimple.C etc.) both ROOT and
> XWin-1.5.3-4 (from [1]) segfault. Using YOUR XWin with debug info etc.,
> ROOT, hsimple.C etc. work fine, i.e. NO segfault etc.
>
> 2. Adding +bs at command line which starts XWin (in startxwin.bat) and
> then trying to run some ROOT OPENGL macro (geom/shapes.C, for example
> see [2]) then the macro fails to be excuted (see [2]), but it works if I
> omit '+bs' OR if I use the workaround described here [3] OR if I use
> YOUR debug XWin.exe!
>
> MAY YOU try [1] with the steps described in [2] and confir/or not the
> segfaults?

Yes, I have tried running the ROOT application, but I am afraid I cannot 
reproduce your problem.


Irrespective of if I use +bs or not, with 1.5.3-4, simple.C runs ok, 
geom/shapes.C causes ROOT to segfault unless XLIB_SKIP_ARGB_VISUALS is used.

You should raise the ROOT segfault as an issue with the ROOT developers.  They 
will be far more qualified to diagnose the issue than me.

If you wouldn't mind trying again, I've built a slightly different debug 
version, which you can get from:

ftp://cygwin.com/pub/cygwinx/XWin.20081203132739.exe.bz2

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