Re: Only 4 multisamples on IR?

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Orad Hi-Tec Systems (orad_u++at++netvision.net.il)
Wed, 09 Oct 1996 18:54:58 +0300

Rob Jenkins wrote:
>
> Hi
>
> iR won't do RGBA with 12 bits per component and 8 multisamples, irrespective of
> pixel size.

True, but it gets even worse: iR won't do RGBA even with 10 bits per component and 8
multisamples, irrespective of pixel size!
But why is that?
By bit consumption calculation you can see that extra-large pixel depth could hold
8 samples, RGBA-12 (and Z).
Even smaller depths could hold 8 samples, RGBA-10 (and Z).
There must be something other than pixel depth holding back those visuals...

> You can get RGB (no alpha) 10 bits per component with 8
> multisamples or RGBA12 with 4 multisamples. Note, for screen-door or blended
> transparency ( pfTransparency with PFTR_MS_ALPHA or PFTR_BLEND_ALPHA ) - you
> don't need source alpha so you could use RGB10 and get 8 samples. This doesn't
> help you if you need the source alpha for other purposes though...

I guess you mean "framebuffer alpha", not "source alpha".

Moshe Nissim
Orad Hi-Tec systems
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