Re: posterized textures on High Impact

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Todd Weybrew (waycool++at++Zx7.engr.sgi.com)
Tue, 13 Feb 1996 20:14:39 -0800

On Feb 13, 6:23pm, Andy Beall wrote:
> Subject: Re: posterized textures on High Impact
> Todd,
>
> I just got my Impact upgrade and also noticed the color quantization.
> I tried as you suggested switching to the 1024x768 mode by issuing
> setmon -n 1024x768_60, which changed my screen resolution but did nothing
> for my textures. Also the window manager didn't seem to resize the
> screen had been resized. Would you mind telling me what I'm doing
> wrong or tell me where to look for instructions? The man pages setmon
> say nothing about Impact, nor does there appear to be any mention of
> Impact in my online books.

re the window manager... since the X server was started at 1280x1024, it will
continue to have a managed area of 1280x1024 after the setmon. the fix is to
use setmon -x <format> then restart the X server so the managed area will be
correct. then the window manager will work correctly.

as to your continued color banding problem... a minor detail I just discovered;
the 32 bit DB visual for 1024x768 on a High Impact is part of patch 1105 which
we haven't released to customers yet (sorry)... will post here as soon as it's
available. use either xdpyinfo (portable) or /usr/sbin/findvis (human
comprehensible 8^)) to find out what visuals your particular Impact supports.

secondly, as someone already mentioned, your textures may be defaulting to 4444
format. with 1 TRAM (i.e. 1 meg of texture memory) that's all she wrote. you
must have 4 meg of texture ram to get 8 bits per component. use
/usr/gfx/gfxinfo to find out how many TRAMS you have.

a couple of other reminders about texture... 1) the largest texture you can
load with one TRAM is 512x512... if a poly is supposed to be textured but shows
up white, this is a good candidate for your problem. 2) textures *must* be a
power of 2 on each edge... i.e. 8x8, 16x16, 32x32, etc.

hope this helps....

>
> Thans a lot,
> Andy Beall
> grad. student
>-- End of excerpt from Andy Beall

-- 
Todd Weybrew				waycool++at++engr.sgi.com
Illusioneer - ISD Applied Engr		(415) 933-6854
Silicon Graphics			(415) 967-9541 FAX

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