Re: Multisampling & RMs

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Allan Schaffer (aschaffe)
Fri, 13 Jan 1995 09:54:03 -0800

On Jan 12, 5:50pm, Marco Crocetta wrote:
>
> Yestarday has been installed a new RM5 on my Onyx RE2.
> We decided to do this in order to get the antialising feature
> based on multisampling and to increase the pixel throughput: on the
> GL Programming Guide I read: "One Additional RM lets you use either
> advanced graphics features such as multisampling, or lets you select a
> high-resolution video format."
>
> 1 RM5 board
> Display 1280x1024 ++at++ 60Hz
> Small pixel depth
>
> Well the problem is that antialiasin doesn't work.

RM4 and RM5 are the same in terms of all features except texture
memory (RM4's allow 4MB texture, RM5's allow 16MB texture). What is
needed for antialiasing/multisampling is "Medium" Pixel depth.

At full-screen resolution (1280x1024++at++60Hz) a single RM (either RM4 or
RM5) can only give you "Small" pixel depth. You will need to lower
your screen resolution (setmon -x 960x680_60, then restart graphics)
or more RM's.

There is a table in the "Onyx and Power Onyx" technical report that
describes the various possible framebuffer configurations as you add
more RM's. I'll transcribe part of it below. You should be able to
get the tech report from your local sales folks. (It is not
available on-line).

One RM is enough for:

640x512 resolution 16 samples 8 bits/component 24-bit Z
640x512 resolution 8 samples 12 bits/component 32-bit Z
960x680 resolution 8/4 samples 12 bits/component 32-bit Z
1280x1024 resolution 0 samples 12 bits/component 32-bit Z

Two RMs are enough for:

1280x1024 resolution 8 samples 8 bits/component 24-bit Z
1280x1024 resolution 4 samples 12 bits/component 32-bit Z
1600x1200 resolution 0 samples 12 bits/component 32-bit Z

Four RMs are enough for:

1280x1024 resolution 16 samples 8 bits/component 24-bit Z
1280x1024 resolution 8 samples 12 bits/component 32-bit Z
1600x1200 resolution 8 samples 8 bits/component 24-bit Z
1600x1200 resolution 4 samples 12 bits/component 32-bit Z

Allan

-- 
Allan Schaffer
Silicon Graphics
aschaffe++at++sgi.com
http://reality.sgi.com/employees/aschaffe

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