virtio-gpu: Get FD for texture

[Antonio Caggiano]

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