Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!sq!hobie
From: hobie@sq.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Double Buffering
Message-ID: <1987Nov15.132726.14177@sq.uucp>
Date: Sun, 15-Nov-87 13:27:26 EST
Article-I.D.: sq.1987Nov15.132726.14177
Posted: Sun Nov 15 13:27:26 1987
Date-Received: Tue, 17-Nov-87 00:36:02 EST
References: <7768@steinmetz.steinmetz.UUCP> <1038@sugar.UUCP> <1863@cadovax.UUCP>
Reply-To: hobie@sq.UUCP (Hobie Orris)
Organization: SoftQuad Inc., Toronto
Lines: 22
Keywords: double buffering, vertical retrace, screens
Checksum: 39970

Keith Doyle (keithd@cadovax.UUCP) writes:
<In article <1038@sugar.UUCP> peter@sugar.UUCP (Peter da Silva) writes:
<>Why don't you just set up two screens and use ScreenToFront and ScreenToBack
<>to flip them? These routines are (as far as I have been able to tell) as near
<>instantanious as you can get. Let intuition worry about the copper lists.
<>That's what it's for, after all.
<
<I suppose that would work, but if you're waiting for IDCMP messages, it
<could be a problem.
<
<Keith Doyle

Not if you have a backdrop  window in each screen and you call ActivateWindow()
after the ScreenToFront().  I've done this and it works well.  Of course, you 
have to do the "clone the IDCMP port" using ModifyIDCMP() so messages always go
to the sames place.

 Hobie Orris			 	| 	
 guest of SoftQuad Inc., Toronto, Ont.	|"There'll be no more giant leeches
 {ihnp4 | decvax | ? }!utzoo!sq!hobie	| When you find the good Lord Jesus"