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  From: Jon M. Taylor <taylorj@gaia.ecs.csus.edu>
  To  : ggi-develop@eskimo.com
  Date: Thu, 1 Jul 1999 11:27:36 -0700 (PDT)

Re: Accelleration (Was: Re: TNT benchmark)

On Wed, 30 Jun 1999, Marcus Sundberg wrote:

> Jon M. Taylor wrote:
> >         You do realize that (in principle anyway) there is no need for one
> > single universal method of implementing acceleration in a KGI driver?  The
> > existing Dali kgicommand API explicitly defines a set of 2D accels
> > (ACCEL_DRAWBOX, etc) which for the most part works OK,
> 
> Note that using one ioctl() per accel operation is definitely not
> recommended for anything else than initial testing, even for 2D.
> Using ioctl()s are almost one order of magnitude slower than using 
> direct access.

	This is very true, however ioctl vs. pingpong vs direct linear FIFO
mapping vs. etc - all of these are just communications channels over which
the same kgicommand interface can flow.  ioctls are fine for development and
testing.

Jon

---
'Cloning and the reprogramming of DNA is the first serious step in 
becoming one with God.'
	- Scientist G. Richard Seed

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