Re: GL transparency/texturing question

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Ran Yakir (rany++at++bvr.co.il)
Tue, 19 Mar 1996 07:22:16 +0000

Most of the stuff in the question was referenced by Angus, however -

> be possible using msalpha and afunction, but they give no example. My
experience has the texture

You can not use msalpha(MSA_MASK) on an IMPACT. msalpha uses the subsamples to
implement 'screen-door transparency' inside a pixel. IMPACT does not have
multisampling at all (a great pity).

In addition, you should not use msalpha OR afunction , because those are IrisGL
commands, which are considerably slower on an IMPACT then their OpenGL
counterparts. IrisGL is implemented on top of OpenGL on an IMPACT, in a layer
called IGLOO (Iris GL Over OpenGL).

Ran

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