Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwvax!tank!uxc.cso.uiuc.edu!uxc.cso.uiuc.edu!ux1.cso.uiuc.edu!uxa.cso.uiuc.edu!cjr20670
From: cjr20670@uxa.cso.uiuc.edu
Newsgroups: comp.sys.mac.programmer
Subject: Re: Alternate screen buffer ... How?
Message-ID: <227700007@uxa.cso.uiuc.edu>
Date: 16 Jun 89 04:23:00 GMT
References: <8042@cc.nu.oz>
Lines: 18
Nf-ID: #R:cc.nu.oz:8042:uxa.cso.uiuc.edu:227700007:000:918
Nf-From: uxa.cso.uiuc.edu!cjr20670    Jun 15 23:23:00 1989


  Okay, but remember, you asked for it.  As (almost) always, the answers are
in IM. Look in Vol III, page 18 for a description of the alternate buffer.
I've never used it, so I can't help you there.  I'm not going to encourage
you to pursue this because the Mac ]['s don't have alternate screen buffers
and have different VBL routines to deal with multiple screens.  Oh, lastly,
the simplist way to get a VBL lock is to just watch tickCount till it
changes, then do what you need (like CopyBits).  This allows your program
to have direct control over the animation and avoid all the memory
problems that VBL's tasks may be prone to develop.

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Charlie Reiman           
creiman@ncsa.uiuc.edu
cjr20670@uxa.uiuc.edu
"Be excellent to each other!"
            -Abe Lincoln