Re: [Qemu-devel] [PATCH] opengl rendering in the sdl window

[Samuel Thibault]

Paul Brook, le Sun 07 Sep 2008 15:36:51 +0100, a écrit :
> > 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.

How often?  Which part(s) of the framebuffer?

> If you really need zero-copy then you should have the renderer read the data 
> directly out of the guest framebuffer.

Same questions.

Samuel