Re: Non-MultiSample Anti-aliasing

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Ran Yakir (rany++at++rtset.co.il)
Sun, 02 Feb 1997 04:04:13 -0800

Angus Dorbie wrote:
>
> I've just checked this and your'e right!! In the optical mode the
> anti-aliasing is not working, probably a broken entransparency state,
> there were a few workarounds for an early Performer 2.0 alpha in there.
>

Angus (and others),

There is a bug (or else, a feature with very secret motivation) on
IMPACT. Textured, antialiased lines are not drawn correctly in certain
situations. It seems to me that in those situations, the texture is not
calculated correctly for the line's pixels, and a zero alpha is
calculated where it should not. Because line antialiasing uses blend,
the lines disapear. I have a small OpenGL program that demonstrates this
behaviour. I'll post it tomorrow from work.
And yes, I do have that patch (1447).

Ran

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