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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window
Date: Sun, 7 Sep 2008 16:03:30 +0100
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To: qemu-devel@nongnu.org
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>

On Sunday 07 September 2008, Samuel Thibault wrote:
> Paul Brook, le Sun 07 Sep 2008 15:36:51 +0100, a =E9crit :
> > > Ideally, once switched to fullscreen you could just let the guest
> > > directly write to the actual video memory (particularly interesting f=
or
> > > Xen and KVM).
> >
> > You really don't want to have the guest writing directly to host video
> > ram. Video ram tends to be high-latency, so you want to write to regular
> > memory, then use a wide block transfer or DMA to copy to video ram.
>
> How often? =20

You probably want to sync the updates to the vertical refresh. Updating mor=
e=20
often than that is pointless.

> Which part(s) of the framebuffer?=20

Whichever parts have changed.

Paul