[Mesa-dev] nv3x xfce4 compositing issue, making good progress, need help / input

[Ilia Mirkin]

On Fri, Sep 11, 2015 at 10:46 AM, Hans de Goede <hdegoede at redhat.com> wrote:
> Hi,
>
> I've been working on trying to fix this one:
>
> https://bugs.freedesktop.org/show_bug.cgi?id=90871
>
> And today I've more or less root caused this, it seems
> that some code is making glTexImage2D calls with npot
> width / height, which fails on nv3x (where as it works
> on nv4x).
>
> The bug has a simple reproducer attached, but that is
> not directly calling glTexImage2D, so it seems that
> the npot values are coming from some helper library
> used (glXBindTexImageEXT  ?).
>
> 2 questions:
>
> 1) Does anyone know / suspect where the glTexImage2D call
> is originating from (see the test-program attachment
> in bugzilla.
>
> 2) Is this a bug in glXBindTexImageEXT (assuming that is
> the culprit), or should the test program take into account
> that the card does not support npot when calling this ?

Without directly answering your questions (as I don't know the
answers), without NPOT support (which nv3x doesn't have), you can only
use non-power-of-two textures with GL_TEXTURE_RECTANGLE, not
GL_TEXTURE_2D. The program that you have does appear to detect this
though, and uses the rect target if ARB_texture_rectangle is
available, which it should be. I guess it should just bail if both
ARB_texture_rectangle and ARB_texture_non_power_of_two aren't
available...

Perhaps code in src/glx messes up? You could put a breakpoint in
_mesa_error and see where it's coming from...

  -ilia