Re: DPLEX questions [was: Re: Pipes]

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 31 Jul 1998 11:44:39 -0700

Angus Dorbie wrote:
>
> Moshe Nissim wrote:
> >
> >
> > > To answer the question I think you are heading towards; although
> > > this is a digital transfer, none of it is available to the graphics
> > > rendering system, this is all digital video after rendering.
> > >
> >
> > Yes, it would have been nice to dedicate one pipe to 2d post-rendering
> > stuff like distortion and blurring...
>
> You can do the equivalent, each pipe renders then distorts, it's a
> symmetric
> solution to the same problem and the performance is exactltly
> equivalent.

Actually with the symmetric approach performance is faster in
most situations since the distortion correction wouldn't be the
same performance as the scene rendering so one or n-1 pipes
would be underutilized. This always assumes that only one pipe
incurred the readback overhead (the main bottleneck) and this
would likely not be the case so you'd also be doubling the
performance cost of the principal bottleneck, and that would
spoil your whole day.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


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