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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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