[vtkusers] GL_MAX_TEXTURE_SIZE = -858993460 !?

[Tim Hutton]

Thankyou for this pointer David.

Purely for the record, glGetError was returning 1282, which is
GL_INVALID_OPERATION.

I have finally worked out what was wrong - I was calling ren->Render()
too early, before my render pipeline was fully initialized (in my
override of wxView::OnUpdate). I simply had to remove that call and
let OnPaint call Render() and all was well.

I put this here because I managed to make the same mistake again just
now and had forgotten what the answer was, so maybe it will help
someone.

Tim

On Thu, Jun 28, 2007 at 12:54 PM, David Cole <david.cole at kitware.com> wrote:
> A google for "OpenGL error code" took me to an msdn page listing some error
> codes... which led me the documentation page for "glGetError" :
>
>  https://msdn2.microsoft.com/en-us/library/ms537109.aspx
>
>
>
>
> On 6/28/07, Tim Hutton <tim.hutton at gmail.com > wrote:
> > Ah yes, maxDimGL does have that value when it goes in, so I guess that
> > call is simply now writing to the variable. I don't see any opengl or
> > vtk errors prior to that point. How do I retrieve the opengl error
> > code?
> >
> >
> > On 28/06/07, David Cole < david.cole at kitware.com> wrote:
> > > This value is 0xcccccccc which means that it is a local uninitialized
> > > variable. Perhaps glGetInteger is returning without putting the value in
> > > there...? Do you see any other errors (OpenGL related perhaps) prior to
> this
> > > occurring...?
> > >
> > > If you init maxDimGL to 0 before the call does it still happen...?
> > >
> > >
> > >
> > > On 6/28/07, Tim Hutton <tim.hutton at gmail.com > wrote:
> > > >
> > > > I'm getting a bad_alloc exception sometimes when I try to load a
> > > > textured surface in VTK. The error is due to the following line in
> > > > vtkopengltexture.cxx (167):
> > > >
> > > > glGetIntegerv(GL_MAX_TEXTURE_SIZE,&maxDimGL);
> > > >
> > > > which returns a value of -858993460. On other occasions it returns a
> > > > value of 4096 and everything works fine.
> > > >
> > > > Have you come across anything similar before?
> > > >
> > > > Platform:
> > > > vtk5.0.3
> > > > win xp
> > > > microsoft visual studio 7
> > > >
> > > > Thanks,
> > > >
> > > > Tim
> > > > _______________________________________________
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> > > >
> > >
> > >
> >
> >
> > --
> > Tim Hutton - http://www.sq3.org.uk
> >
> > Take the Organic Builder challenge -
> > http://www.sq3.org.uk/Evolution/Squirm3/OrganicBuilder/
> >
>
>



-- 
Tim Hutton - http://www.sq3.org.uk

Take the Organic Builder challenge -
http://www.sq3.org.uk/Evolution/Squirm3/OrganicBuilder/