4Sight, X or NeWS?
Marcel Samek
marcel at mlogic.UUCP
Mon Oct 24 10:24:13 AEST 1988
In article <20894 at sgi.SGI.COM> miq at chromavac.SGI.COM (Miq Millman) writes:
>graphics hardware is incredibly fast, so performace is not hurt. On the 4D
>series, pixel performance is about 8 million pixels per second.
>
In the context of the discussion, which was about pixel based operations,
this statement is utter nonsense.
The architecture of the 4D series does not provide direct acess into the
frame buffer and thus any pixel data generated by an application program
must be passed down the geometry pipeline. While the 3D geometry engines
may be able to get pixel performance of 8 million pixels per second when
painting 3d data, application programs can achieve pixel performances of
significantly less than 100,000 pixels per second (roughly 2 orders of
magnitude less) when painting pixel data.
If you wish to read pixels from the frame buffer, the performance is
significantly slower than if you wish to write pixels.
It is disappointing to see Silicon Graphics employees post such deceptive
garbage to the net.
Marcel
--
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