[Spice-devel] [PATCH v2 spice-protocol 2/2] Add unix GL scanout messages

[Gerd Hoffmann]

On Do, 2015-12-17 at 06:34 -0500, Marc-André Lureau wrote:
> Hi
> 
> ----- Original Message -----
> > > What happen with multiple monitors? Is it just not supported or a single
> > > scan-out is used for multiple monitors? Would be sensible to add the number
> > > of the scan-out to support multiple monitors?
> > 
> > Yes, I think we should add a scanout number here.
> 
> How whould that be compatible with the spice MonitorConfig messages? I don't think it's necessary, and it could easily be added later if needed.

Ahem, scratch that.  MonitorConfig isn't going to fly with virtio-gpu
(at least not with multiple heads defined that way).  With virtio_gpu we
will have one display channel per head, so we can use the channel id to
identify the scanout.

> > qemu (with wip patches) can do that already, for non-qxl cards.  Guest
> > renders into a simple framebuffer, qemu writes this into a opengl
> > texture, exports the texture as dma-buf and hands over a handle.
> 
> I think his point was rather a similar message to share a simple shm (non-dmabuf/gl)

Sure, we could create shm segments, then try using the X11 mit-shm
extension to display without copying again.

But does it make sense with the world moving forward to opengl/wayland?
It will be obsolete in a few years ...

cheers,
  Gerd