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From: spence@cbmvax.commodore.com (Spencer Shanson)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: hardware sprites
Keywords: sprites
Message-ID: <22258@cbmvax.commodore.com>
Date: 7 Jun 91 21:27:59 GMT
References: <19672@csli.Stanford.EDU> <2979@public.BTR.COM>
Reply-To: spence@cbmvax.commodore.com (Spencer Shanson)
Organization: Commodore, West Chester, PA
Lines: 31


In article <2979@public.BTR.COM> valentin@public.BTR.COM (Valentin Pepelea) writes:
>In article <19672@csli.Stanford.EDU> bratt@csli.Stanford.EDU (Harry Bratt)
>writes:
>>
>>How do you make a hardware sprite disappear without doing FreeSprite() ?
>
>>So - should I be doing GetSprite(), FreeSprite() all over the place?
>>Should I be doing a ChangeSprite() to point to a block of 0's?
>>Should I MoveSprite() outside the bounds of the ViewPort???
>>Could I set the height to 0????????
>
>Do not FreeSprite() like crazy. That function might take too long to execute.
>The way I clear the sprite is by ChangeSprite()'ing to a buffer full of 0's.
>I could just set the height to 0, but I would have to store the current height
>into a temporary variable, and I don't want to waste time doing that.
>

Valentin, ChangeSprite() has to MoveSprite(), whereas FreeSprite()
is much simpler - point the sprite to a default sprite of 0s. I would be surprised
if you have found ChangeSprite() to be faster than FreeSprite().

>Valentin

-- 
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Spencer Shanson - Amiga Software Engineer     | email: spence@commodore.COM
                                              | or uunet!cbmvax!spence
All opinions expressed are my own, and do not | Bix: sshanson
(necessarily) represent those of Commodore.   | "Copper? I hardly even
                                              | know her!"