[Nouveau] [Bug 90871] NV30: Xfwm4 use_compositing - garbled display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90871

--- Comment #41 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Hans de Goede from comment #40)
> Hi All,
> 
> (In reply to Olivier Fourdan from comment #11)
> > Created attachment 116536 [details]
> > test program
> 
> So after some time away from this bug, I'm back onto it. The problem is that
> the test program ends up using
> GL_TEXTURE_2D type textures / GLX_TEXTURE_2D_EXT target, where it should be
> using GL_TEXTURE_RECTANGLE_ARB.
> 
> The root cause for this seems to be that epoxy_has_glx_extension (dpy,
> screen, "GL_ARB_texture_rectangle") always returns false, even though the
> extension is there, as confirmed with both glxinfo and glxgears-info.

Er yeah, it's not a GLX ext, no reason it'd be coming up in the GLX ext list.
While similarly-named, they're entirely separate namespaces.

> 
> Now the extension in question is not a glx-extension, but a gl-extension, so
> I've also tried calling:
> epoxy_has_gl_extension ("GL_ARB_texture_rectangle") but that always returns
> false too.

That's surprising.

src/mesa/main/extensions.c:   { "GL_ARB_texture_rectangle",                  
o(NV_texture_rectangle),                    GL,             2004 },
src/mesa/state_tracker/st_extensions.c:   extensions->NV_texture_rectangle =
GL_TRUE;

So it should actually always be exposed for any st/mesa-backed dri driver
(including nv30).

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