lines and libraries
Mike York
zombie at voodoo.UUCP
Wed Apr 24 05:10:38 AEST 1991
In article <1991Apr22.163320.8755 at odin.corp.sgi.com> kurt at cashew.asd.sgi.com (Kurt Akeley) writes:
>In article <1991Apr17.144853.17441 at dsd.es.com>, pmartz at undies.dsd.es.com (Paul Martz) writes:
>|> 1) Is it normal to see move/draw perform better on a Personal Iris GT
>|> than a VGX? I really should be using v3f for VGX machines, right?
>
>Yes, you really should use v3f on GT, GTX, and VGX machines. The VGX in
>particular cannot parallelize move/draw syntax commands, and therefore
>performs very poorly on them. The Personal Iris is unfortunately optimized
>for the soon-to-be-obsolete move/draw interface.
Does this mean that our PI's are soon-to-be-obsolete?
>v3f calls are the future of the Iris Graphics Library. If you choose to
>take advantage of the performance advantage of move/draw calls on current
>Personal Iris equipment, you should consider writing your code to use
>v3f on all other platforms.
Here's an excerpt from the man page for move on 4D/35 we've got here:
NOTE
move should not be used in new development. Rather, lines should be
drawn using the high-performance v commands, surrounded by calls to
bgnline and endline.
We've been following this advice. All of our production machines are currently
4D/25TG's (considering 4D/35 upgrades). Should we change back to move/draw
commands, or is there hope for "high-performance v commands" to be high
performance on the PI's?
--
Mike York |
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