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Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window |
Date: |
Sun, 7 Sep 2008 15:36:51 +0100 |
User-agent: |
KMail/1.9.9 |
On Sunday 07 September 2008, Samuel Thibault wrote:
> Jamie Lokier, le Sun 07 Sep 2008 00:27:23 +0100, a écrit :
> > Samuel Thibault wrote:
> > > Jamie Lokier, le Fri 05 Sep 2008 13:02:15 +0100, a écrit :
> > > > Another way to map guest framebuffer to video memory is the XF86DGA
> > > > extension, which is great when you can use it.
> > >
> > > It is being deprecated and probably never works nowadays anyway :)
> >
> > That's a shame as the alternatives are all slower on old video cards.
>
> Yes, and because alternatives don't provide so much performance.
> Ideally, once switched to fullscreen you could just let the guest
> directly write to the actual video memory (particularly interesting for
> 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.
If you really need zero-copy then you should have the renderer read the data
directly out of the guest framebuffer.
Paul
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, (continued)
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Andreas Färber, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Avi Kivity, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Anthony Liguori, 2008/09/06
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Daniel P. Berrange, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Anthony Liguori, 2008/09/07
Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Stefano Stabellini, 2008/09/04
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/05
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/06
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window,
Paul Brook <=
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Paul Brook, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Paul Brook, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Paul Brook, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Anthony Liguori, 2008/09/07
- Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Samuel Thibault, 2008/09/07
Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Jamie Lokier, 2008/09/07
Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window, Stefano Stabellini, 2008/09/08