On Mon, 21 Jul 2003, Billy Biggs wrote:

> Mark Vojkovich (mvojkovi@XFree86.Org):
> 
> > > While I'm at it, how hard do you think it would be to do triple
> > > buffering in the NVIDIA driver for this same problem?
> > 
> > NVIDIA hardware can only double buffer.  Using more buffers than two
> > would require queuing them up and programming the new buffers in the
> > interrupt handler.
> 
>   Can you query which buffer is being displayed?  I'd just like to
> replace tearing with frame drops if possible, so changing which buffer
> is queued next would be sufficient.

  I know which one is being displayed, but I can't override the one
that is pending.  If I get a PutImage request and there is already
one buffer being displayed and one pending, I have three choices.

1) Drop the new request entirely.
2) Spin until a buffer is free.
3) Overwrite the data in the pending buffer.  This will tear if the
   buffer switches while your are overwriting.

I currently do #3 and there is a #if in the "nv" driver allowing you
to switch to #2.


			Mark.

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