Re: pixeldepth on IR

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From: Angus Dorbie (dorbie++at++sgi.com)
Date: 02/01/2001 12:35:03

Ah, you're saying you CAN get this....

With quadbuffer you have no depth buffer for the frontbuffer, just
backbuffer left and right, that's 46 bits saved right there.

There are some proprietary memory saving techniques which exploit the
multisample implementation to save memory.

Cheers,Angus.

Angus Dorbie wrote:
>
> The calculations are only an approximate guide, there is internal
> padding, masks for windowing, overlay planes etc. Your total is very
> near the limit and doesn't account for any of this. In addition there
> are underlying hardware capabilities which are required to support
> various framebuffer formats so simply adding up the numbers will not
> give you the whole picture.
>
> Cheers,ANgus.
>
> Daniela Rainer wrote:
> >
> > Hi Olivier
> >
> > thanks for your answer.
> >
> > > As far as i know, XS is no longer supported, you can have
> > > S (256 bits), M (512) L (1024) and XL (2048).
> >
> > This is what I thought, too, but could you please explain, why I can
> > have
> > RGBA, Z 23, quadbuffer and 4-sample antialiasing if the pixeldepth
> > is only medium?
> >
> > findvis tells me, that I can have 12bit RGBA, quadbuffer, Z23 and 4
> > samples:
> > 0x6f, RGBA 12/12/12/12, db, stereo, Z 23, S 1, samples 4
> >
> > I thought the calculation is
> >
> > (R+G+B+A+Z) * quadbuffer + (R+G+B+Z) * 4-sample
> > = (48+23) * 4 + (36+23)*4 = 520
> >
> > Could you please tell me what is wrong in my calculation? Maybe alpha
> > not quadbuffered?
> >
> > Best Regards
> > Daniela
> >
> > --
> > -------------------------------------------------------------------------
> > Daniela Rainer | email: rainer++at++hlrs.de
> > Rechenzentrum Uni Stuttgart (RUS) | http://www.hlrs.de/people/rainer/
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