Re: Multisample Masks

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Ran Yakir (rany++at++rtset.co.il)
Thu, 27 Feb 1997 16:56:39 +0000

On Feb 26, 1:57pm, Sharon Clay wrote:
> Subject: Re: Multisample Masks
>
> ->There is a *very* annoying SGI hardware bug which prevents the setup
> ->of n=8 multisamples coexisting with alpha bit-planes (no such visual
> ->exists). You can only do n=4 multisamples with alpha bit-planes.
> ->This is *independent* of your framebuffer memory size (number of RM6
> ->boards).
>
> Just to clarify to avoid possible confusion here, destination alpha planes
> are not needed to implement the fade techniques discussed - they only use
> source (in-coming) alpha.
>
So they do. However, in broadcast applications, using the Sirius, you use the
alpha planes to send a mask for the chromakeyer, so that you can perform
obstructions of real video by virtual objects, in the chromakeyer. This is the
reason why we must use alpha bitplanes, and therefore suffer from this bug. I
must agree with Orad on this matter - this is really a very annoying bug.

Ran

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