Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!versatc!ubvax!ardent!peck!rap
From: rap@peck.ardent.com (Rob Peck)
Newsgroups: comp.sys.amiga.tech
Subject: Re: VSprites don't show
Message-ID: <7162@ardent.UUCP>
Date: 7 Jul 89 21:26:18 GMT
References: <866@manta.NOSC.MIL>
Sender: news@ardent.UUCP
Reply-To: rap@peck.ardent.com (Rob Peck)
Organization: Ardent Computer Corp., Sunnyvale, CA
Lines: 27

In article <866@manta.NOSC.MIL> dwi@manta.nosc.mil.UUCP (Roger Uzun) writes:
>I am using the standard Amiga GEL system to animate 3 BOB's
>   [other details omitted]
>and 1 VSprite on a 320X200 64 color ExtraHalfbrite, double
>with SortGList()DrawGList()MakeScreen()RethinkDisplay() since
>ON_SPRITE is the default for the system).
>
>Any ideas why a VSprite could be added to the GEL List and not
>drawn?
>

See the sample program in the Programmer's Guide To The Amiga on VSprites.
If I remember right, it does the DrawGList, (which creates a sprite copper
list) and a MrgCop among other things.  But then, RethinkDisplay I believe
does a MrgCop too. HMMM.  (Programmer's Guide To The Amiga is from SYBEX,
author: ME.)


The other thing that would DEFINITELY prevent vsprites from being allocated
is the sprite-reserved fields (I forget their names) in the GfxBase and
the GelsInfo structures.  If these fields say there are no sprites available
to the vsprite engine, no vsprites are drawn.

Hope this helps


Rob Peck