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- Path: informatik.tu-muenchen.de!fischerj
- From: fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: Demo/game to OS frien
- Date: 20 Feb 1996 01:31:27 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4gb89f$104@sunsystem5.informatik.tu-muenchen.de>
- References: <4eqsh9$qmp@sunsystem5.informatik.tu-muenchen.de> <56000205719176820972@BIRDLAND>
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-
- Steffen Haeuser (magicsn@birdland.es.bawue.de) wrote:
-
- : fischerj%informatik.tu-muenchen.de@INTERNET wrote :
-
- : > Typical OS-games scroll far beyond 25fps, for example
- : > a unix game I saw on "POOOOOWERFUL" sgi. Not really
- : > a claim that it's not possible.
-
- : >
- : > 'Typical OS' is also that it can't do what good old
- : > A500 games did with using copper.
-
- : One question : WHY should a game that got the base address of the Bitmap write
- : FASTER directly to it than a game that got this pointer from the OS ???? That
- : is silly (okay, i am leaving out copper etc. stuff here... but we want to go
- : with the future, don't we...)
-
- But the copper stuff was what I was talking about. And as you need
- copper overtake for efficient multisplitscreen on chipset, it doesn't
- care if yo display a OS-bitmap or just an allocated area. Of course
- blitter blits a OS-bitmap as fast as otherwise allocated chipmem ;)
-
- Of course lots of the A500 games could have been done OSy, just
- because they had no splitscreen. Take R-Type or Katakis, which
- scroll 25fps by default, but could run 50fps on A500 on intuiscreen.
- And on A1200 more bobs could appear bevore framerate drops beyond 50fps.
-
- But, I insist, those fancy megaparalax scrolling games would just be
- slower (running on same machine) because you would have to _copy_
- each "vport".
-
- Got nothing to do with the chunky things we wrestle now about, though.
-
- : Steffen Haeuser
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-
-