Re: GL transparency/texturing question

New Message Reply Date view Thread view Subject view Author view

Sharon Clay (src++at++rose)
Tue, 19 Mar 1996 00:01:14 -0800

+>---- On Mar 19, 4:35pm, Simon Bennett wrote:
> Subject: Re: GL transparency/texturing question
->> > 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).
->
->A bit off the topic... but I've *heard* that you can multi-sample on an
->IMPACT if you add the ICO... can anybody confirm, deny or qualify this?

What you get is not multisampling but minification.
Your display area (and thus your GL viewport) is twice the size of the
video output and the full-channel image is filtered down as part of scan-out.
This is all done independently of the GL which means that you do also have to
change the sizes of things that have a pixel-specific size, such as lines,
points, bitmaps, and pixel writes.

src.

-- 
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++
Sharon Rose Clay (Fischler) - Silicon Graphics, Advanced Systems Dev.
src++at++sgi.com  (415) 933 - 1002  FAX: (415) 965 - 2658  MS 8U-590
-----{-----{---++at++   -----{----{---++at++   -----{----{---++at++   -----{----{---++at++

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:52:33 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.