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- Path: sparky!uunet!ulowell!m2c!nic.umass.edu!caen!uwm.edu!rpi!deweeset
- From: deweeset@ptolemy3.rdrc.rpi.edu (Thomas E. DeWeese)
- Newsgroups: comp.sys.mac.programmer
- Subject: Re: Arcade-style animation...
- Message-ID: <k2q3rl_@rpi.edu>
- Date: 27 Jan 93 17:25:33 GMT
- References: <1993Jan23.014127.5750@cs.ucla.edu> <1993Jan25.094256.12845@rulway.LeidenUniv.nl> <34994@goofy.apple.COM>
- Organization: Rensselaer Polytechnic Institute, Troy, NY
- Lines: 27
- Nntp-Posting-Host: ptolemy3.rdrc.rpi.edu
-
- In article <34994@goofy.apple.COM> chris_russo@gateway.qm.apple.com (Christopher Russo) writes:
- >In article <1993Jan25.094256.12845@rulway.LeidenUniv.nl> Theo Vosse,
- >vosse@ruls41.LeidenUniv.nl writes:
- >Unless you have sprites overlapping each other, which would lead to some
- >ugly flicker and possibly a mess on the screen. You'll probably want to
- Well there are a few problems that I see with all this. First off
- I think you will tend to get ugly filckering even if they don't overlap
- Becuase sooner or later you are going to erase the sprite the scan line
- will pass you, drawing the background, and then you will draw your sprite,
- thus there will be one frame where the sprite ceases to exist. I can't
- think of any way to avoid this.
-
- >Speaking of which, anyone have some low-level info, like where the screen
- >pointer is kept, and the procedure for changing it? Come on, give with the
- >info.
-
- Well I know for a fact that the original Toby Frame Buffer is Compleately
- incapable of scrolling side to side. If you look at the documentation for
- Max Apple Zoom, the guy who wrote it says so. And I am willing to take his
- word as to that fact. The other problem is that you would have to find
- and know about every video card on the market (as I don't believe there
- is any standard way to get this info from the card's driver). Another thing
- that really bothers me is that they didn't require page fliping for
- video cards. So while you can ask for it the card is allowed to say no way.
- Anyway it is a little late to worry about such things now. So don't :)
- Thomas DeWeese
- deweeset@rdrc.rpi.edu
-