Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: why is ico slower
Message-ID: <9001122046.AA08027@expire.lcs.mit.edu>
Date: 12 Jan 90 20:46:56 GMT
References: <19705@vax5.CIT.CORNELL.EDU>
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 13


    The new version of ico in double buffer mode draws the entire
    window each time the icosahedron moves, rather than just a
    square region around the icosahedron as the old version did.

It doesn't "draw the entire window" in a strict sense, it uses
the multi-buffering extension if it exists.  The sample implementation
of this extension uses pixmaps, and copies the entire buffer on-screen.

    Does anyone know why it was changed?

To provide an example of using the multi-buffering extension.
It is, after all, just a demo.