Re: 12bit images

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 13 Jul 1999 15:44:39 -0700

Yes it supports 12 bit textures (actually even better on iR2 for some
stages).

If you use an RGBA12 visual you'll get 12 bits all the way to the
framebuffer but it will go through 8 bit DACs in the DG board. You
really need the digital video out option if you require that precision
all the way through to video.

The lighting result & interpolation of color across a poly (gouraud
shading) has less precision, it is 10 bits so it's worth bearing that in
mind if you intend to use a modulate texture environment.

Cheers,Angus.

Dave Sullivan wrote:
>
> Hello--
>
> I was wondering if anyone had any knowledge on whether or not
> performer/sgi supports 12 bit textures.
>
> If I use an object that has a 12 bit texture applied to it, will it be
> dropped to 8 bits before processing occurs.
>
> If performer/sgi does not support 12 bit textures is there some kind of
> work around???
>
> Thanks....Dave
>
> --
> ************************************************************************
> Dave Sullivan--Visual Modeling Engineer SAIC--FT. Belvoir
> Voice: (703)-704-2722 Army Night Vision Labs
> Fax: (703)-704-1125
> Email: dsulliva++at++nvl.army.mil
> ************************************************************************
>
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-- 
For years now, whenever NT has been proven to have some debilitating
weakness we've heard from MS advocates that NT would catch up, there was
just an incredible faith in this OS and Microsoft's ability to somehow
get there. With the recent results of the Linux vs NT serving benchmark
that same attitude can be seen in the Linux community. The Linux folks
aren't too worried, "Sure the single threaded IP stack was slow but
it'll be fixed in the next release.", it's eerily familiar but I have
confidence in the Linux community's ability to remedy problems and I
don't groan in pain as I used to when Microsoft made similar claims.


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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