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Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!ames!think!bloom-beacon!apple!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga.tech,comp.sys.amiga
Subject: Re: Double Buffered Display
Summary: Ooo.  Ick.
Message-ID: <10801@well.UUCP>
Date: 22 Feb 89 09:44:17 GMT
References: <938@wpi.wpi.edu>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Followup-To: comp.sys.amiga.tech
Organization: The FOX Network.  For people who just can't get enough bad TV.
Lines: 36
Quote: "I went to court for a parking ticket; I pleaded insanity."  -- S. Wright

[ Much convoluted code and consternation by Kevin deleted. ]

	Yuck.  The approach documented in the RKM is icky, and hard to work
with.  I like this approach much better:
--------
	InitBitMap (&bm1, deep, wide, high);
	InitBitMap (&bm2, deep, wide, high);
	InitVPort (&vp1);
	InitVPort (&vp2);
	InitView (&v1);
	InitView (&v2);

	v1.ViewPort = &vp1;
	v2.ViewPort = &vp2;

	rasinfo1.BitMap = &bm1;
	rasinfo2.BitMap = &bm2;
	rasinfo1.Next = rasinfo2.Next = NULL;

	vp1.RasInfo = &rasinfo1;
	vp2.RasInfo = &rasinfo2;

	MakeVPort (&v1, &vp1);
	MakeVPort (&v2, &vp2);
	MrgCop (&v1);
	MrgCop (&v2);
--------

	At this point (.), you can LoadView() either v1 or v2, and it'll pop
onto your screen at the next VBLANK.  Much less pain and misery all around.

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	INET: well!ewhac@ucbvax.Berkeley.EDU
 \_ -_		Recumbent Bikes:	UUCP: pacbell > !{well,unicom}!ewhac
O----^o	      The Only Way To Fly.	      hplabs / (pronounced "AE-wack")
"Work FOR?  I don't work FOR anybody!  I'm just having fun."  -- The Doctor