rec.autos.simulators

nvidia GEForce256 ($8300+) and GPL?

keit

nvidia GEForce256 ($8300+) and GPL?

by keit » Sat, 04 Sep 1999 04:00:00

I know it's jumping the gun, but you could actually buy one of these boards now:

http://www.racesimcentral.net/

Wait a month, and these boards will be under $300 from several manufacturers.

Is it reasonable to assume that the offloading of some OpenGL processing to the
video card will improve the frame rates in GPL? I get pretty good frame rates
with my Celeron 300A at 450MHz, but that damn mirror refresh BS is annoying. I
wonder if the GEForce256 driver will also have reduced performance with the in
car view.

Keith.

Chris Schlette

nvidia GEForce256 ($8300+) and GPL?

by Chris Schlette » Sat, 04 Sep 1999 04:00:00

Probably not, GPL really isn't designed to take advantage of a lot of the
card's features.  You might see a framerate improvement over say a TNT2
Ultra simply because the board, at least on paper, should be a lot faster so
you might be able then to set the refresh rates of the mirrors to 1 and
still get 36fps in***pit.

But thats just speculation.


David Ript

nvidia GEForce256 ($8300+) and GPL?

by David Ript » Wed, 08 Sep 1999 04:00:00


>Is it reasonable to assume that the offloading of some OpenGL processing to the
>video card will improve the frame rates in GPL?

Don't assume that T&L processing will be offloaded without a patch.  I
did a "strings rastOGL.DLL | grep gl" to see which OpenGL functions are
being called.  To my inexpert eye, it looks like Papy wrote their own
T&L code rather than using the OpenGL functions that the GeForce
will accelerate.

When supported, hardware T&L will help a lot when you're CPU-bound and
a lot of those CPU cycles are dedicated to T&L.  It won't help much if
fill rate or the drivers are the main bottleneck.  OpenGL GPL with mirrors
seems mostly driver-bound on my system (TNT1, Celeron 366 at 539 MHz) up
to 1024x768.  Beyond that, the TNT1 starts to run out of fill rate.  A
GeForce should help a lot when running at higher resolutions, merely
because of the higher fill rate.  But 1152/1280/1600 with laggy mirrors
and reduced frame rates at the start of the race still wouldn't be ideal.

I asked Nick Triantos at Nvidia if he was aware of the GPL / TNT mirror
issue.  He said that he'd try to talk to Papyrus and figure out the
problem.  No guarantee that we'll see a fix anytime soon, but a good
sign.

--

spamgard(tm): To email me, put "geek" in your Subject line.

Chris Schlette

nvidia GEForce256 ($8300+) and GPL?

by Chris Schlette » Wed, 08 Sep 1999 04:00:00

Currently most developers do.  It gives the better ones a good way of
optimizing their rendering pipeline.  There has been quite a bit of
discussion on many of the developer lists about whether to use T&L on
hardware.

Hey, thats a good piece of information.


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