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Date: Tue, 18 May 2010 11:23:04 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] Add QEMU DirectFB display driver
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Julian Pidancet <julian.pidancet@citrix.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Paul Brook <paul@codesourcery.com>

On 05/18/10 11:12, Stefano Stabellini wrote:
> I think it would be better to implement an accelerated frontend for
> rendering the framebuffer, like opengl or xv.

Well.  xv is pretty pointless IMHO.  gl makes sense.  But to have some 
effect this needs some major restructions in qemu, the current 
DisplayState infrastructure can't handle anything but a simple, stupid 
framebuffer.  There isn't much to accelerate, except maybe scaling the 
guest display to fullscreen on the host.

qxl + spice will change that though.  qxl is a paravirtualized gfx 
adapter.   Guest sends rendering commands.  The spice protocol sends the 
rendering commands over the wire to the spice client, which in turn will 
render them (and can use gl to accelerate that).

cheers,
   Gerd