On Die, 2002-02-12 at 20:42, Mark Vojkovich wrote: 
> On 12 Feb 2002, Michel D�nzer wrote:
> 
> > On Tue, 2002-02-12 at 18:38, Andy Isaacson wrote:
> > 
> > > Look at the various drivers in xc/programs/Xserver/hw/xfree86/drivers/*
> > > to see how ShadowFB is used.  The MGA is sorta the original standard...
> > 
> > It's no longer state of the art as it uses the old shadowfb module,
> > which updates the real framebuffer after each (set of) operation(s). The
> > fbdev driver uses the new mishadow code, which updates at regular
> > intervals, allows for easy rotation, ...
> 
>    Not sure that will give better interactivity.

I was wondering about that myself.

> You move lots of dispersed little busy waits to single large busy waits.

On the other hand, the savings in the amount of data to be transferred
to the real framebuffer might make a difference. I guess there's only
one way to find out. :)


-- 
Earthling Michel D�nzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member   /  CS student, Free Software enthusiast
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