Alberico, James F wrote:
For what it's worth, additional info on this thread:
I saw the same bad performance on an Fx 3400 with new driver. I was not
able to find any properties or run options to alleviate the problem (10
fps or less, when looking at an airfield -- running with enhanced
lighting OFF).
Gerard's fix (comment out the call to get_vasi_lights_root()) worked
great. All is smooth now. Thanks, Gerard!
A better fix might be to use point lights for VASI/PAPI rather than
commenting them out entirely.
Here's my theory. VASI/PAPI and the approach lighting "rabbit" get
drawn with larger antialiased points. These are "unaccelerated" for the
gamer level hardware (i.e. GeForce) but I found in the earlier versions
of the cards/drivers that you could easily get away with just drawing a
few larger "software" points and not see any kind of performance hit at
all ... as long as you didn't get too crazy with it.
Now, nvidia does offer a hardware accelerated version of these points in
it's more expensive quadro line of cards intended for the "professional"
graphics market.
I suspect that they are intentionally making antialiased points
artificially slow in their latest drivers to prevent people like us from
getting away with using just a few here and there without upgrading to
really high priced Quadro cards.
I could be wrong ... maybe there's a valid technical reason, but this
sounds more like a "marketing" thing than a driver bug from my perspective.
Curt.
--
Curtis Olson http://www.flightgear.org/~curt
HumanFIRST Program http://www.humanfirst.umn.edu/
FlightGear Project http://www.flightgear.org
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