Re: [GtkGLExt] Is it a bug of gtkglext?

[Braden McDaniel <braden endoframe com>]

On Fri, 2009-05-15 at 18:38 +0800, 明覺 wrote:
> On Fri, May 15, 2009 at 2:35 PM, Braden McDaniel <braden endoframe com> wrote:
> > On Fri, 2009-05-15 at 11:58 +0800, 明覺 wrote:
> >> On Wed, May 13, 2009 at 11:14 PM, Braden McDaniel <braden endoframe com> wrote:
> >> > On Wed, 2009-05-13 at 15:09 +0800, 明覺 wrote:
> >> >> I compiled  the example gtkglextmm program gears.cc(attached)
> >> >
> >> > There's no reason to attach source code that is part of the GtkGLExt
> >> > distribtion to mailing list messages.  We know where to find it. :-)
> >> >
> >> >>  to
> >> >> a.out, it can start and display successfully, but if i resize the
> >> >> window, a segmentation fault error will occur, here is the error info
> >> >> from valgrind. any advice to solve it? thanks
> >> >
> >> > The actual failure is happening inside of Mesa (presumably) code.
> >> > glXWaitX isn't reasonably close to line 659 in trunk Mesa; so you'll
> >> > need to track this down in the source to whatever version you're using.
> >> >
> >> > You should probably try turning up the verbosity in valgrind to see if
> >> > it will tell you *what* value was uninitialized; though looking at the
> >> > right line 659 might make that apparent.
> >>
> >> thank you for the information, here is the ouput of valgrind, how
> >> could i solve it? and someone said that it's caused by video driver
> >> error, is that possible?
> >
> > As I suggest above, inspect the source for whatever version of Mesa
> > you're using.  Find the variable that valgrind is claiming is
> > uninitialized.
> 
> I'm using the mesa from its git, that the latest code,(I also used
> 7.4, 7.5 and 7.6 of mesa, all the similar error), the variable not
> uninitialized should be psc->driScreen->waitX
> in line 659 of glxcmds.c 	    if (psc->driScreen->waitX != NULL)
> any advice? thanks

That sounds like it's almost certainly the bug that Jean pointed out.  I
suggest applying the patch attached to that bug report.

-- 
Braden McDaniel <braden endoframe com>