From: Tom Flynn (flynnt++at++engr.sgi.com)
Date: 11/14/2000 15:58:44
On Tue, 14 Nov 2000, Mark Evans wrote:
> I have a GeForce 2 video card with a PIII on a Linux
> machine, with XFree 4.0.1 and 0.95 driver. Can I get
> full-scene antialiasing? If it is possible, how do I
> have to set up my program?
You don't need to modify your program, just set some environment
variables. From NVidia's FAQ:
__GL_ENABLE_FSAA Setting this to a non-zero value will enable full
scene antialising. Note that since this is an
environment variable, it can be set on a per-process
basis
__GL_FSAA_QUALITY This can be either 0, 1 or 2. 0 means 1.5x1.5
oversampling. 1 means 2x2 oversampling with a
texture lod bias. 2 means 2x2 oversampling with no
texture lod bias. Note that this variable only makes
sense when __GL_ENABLE_FSAA is set.
> How does the GeForce 2 do the antialiasing? Is it done
> by multisampling? If it is, how many samples does it use?
It is not done by multisampling. It is done by supersampling. The amount
of sampling is controlled by the __GL_FSAA_QUALITY variable. You will
get a fill performance hit. You'll probably want to drop your screen
resolution to try to compensate.
Have fun,
tom
-- "Mongooses are famous for their snake-fighting ability, and are almost always victorious because of their speed, agility, and timing and also because of their thick coat."
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