Re: Readback Framebuffer.

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 02 Jun 1999 15:20:22 -0700

I sent a message saying 80 MBytes/sec on the RBUS from Raster Managers
to Geometry Engine Distributer was the readback limit. This is wrong, I
haven't seen the message so I'm not sure if it got to info-performer but
this is the correction. It's over double that bandwidth. I was thinking
Mpixels/sec which I've had at 80-90Mpix/sec on readback for RGB data.

As I said in the last message, used 16 bit depth visual and unsigned
short for the readback for best performance on large reads.

Cheers,Angus.

Peter McDowell wrote:
>
> Hello All,
>
> i have a question, if there is a possibility to get the pointer to the
> framebuffer ( esp. the ZBuffer ). glReadPixels isn't' very fast, when you
> have to read back a big buffer. I'm working on a Onyx2 IR.
>
> Many thanks in advance,
>
> Peter
>
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