RE: virtio-gpu: Get FD for texture

["Kasireddy, Vivek" <vivek.kasireddy@intel.com>]

Hi Antonio,

> 
> I am starting to believe that the error is due to the fact that no EGLContext is active on the
> current thread (the one running the Vulkan application).
[Kasireddy, Vivek] Which UI module (and Host environment) are you testing with?
gtk? egl-headless? Could you please provide more details about the environment and
the use-case?

> 
> Trying to call eglMakeCurrent within this thread gives me an EGL_BAD_ACCESS error
> as the EGLContext associated to the GL texture belongs to a different thread.
[Kasireddy, Vivek] IIUC, contexts can only be bound to one thread at a time. So you either
need to release the context in the other thread (eglMakeCurrent(NULL, NULL) before making
it current in your current thread or create a shared context between both the threads to be able
to share textures.

Thanks,
Vivek

> 
> Does that make sense?
> 
> Kind regards,
> Antonio Caggiano
> 
> On 27/09/21 12:21, Antonio Caggiano wrote:
> > Hi,
> >
> > I am trying to support a Vulkan application in the guest
> > (GTKGlArea+VirGL+venus) which needs to import a GL texture from a GL
> > context.
> >
> > Before doing that, I need to get a FD for that texture, therefore I
> > tried with calling egl-helpers.h:egl_get_fd_for_texture() but I get an
> > epoxy error:
> >
> >  > No provider of eglCreateImageKHR found.  Requires one of:
> >
> >  >   EGL_KHR_image
> >
> >  >   EGL_KHR_image_base
> >
> > This is a bit weird to me as I am sure I am running QEMU with iris and
> > according to eglinfo both of these extensions are available.
> >
> > Do you think my approach makes sense or I am doing something wrong
> > somewhere?
> >
> >
> > Kind regards,
> > Antonio Caggiano