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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 friendly part II
- Date: 6 Jan 1996 19:36:14 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4cmive$21c@sunsystem5.informatik.tu-muenchen.de>
- References: <38231819@kone.fipnet.fi> <4cgsn7$ke3@maureen.teleport.com> <38231852@kone.fipnet.fi> <4ck41j$a9a@serpens.rhein.de> <38231887@kone.fipnet.fi>
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-
- Jyrki Saarinen (jsaarinen@kone.fipnet.fi) wrote:
-
- : > I'm not sure whether ScrollVPort() with different BitMaps is
- : > supported on anything else than the native graphics either.
- : > If it would be supported it could be pretty slow if a bitmap
- : > has to be swapped from fast memory to the card.
-
- i heard even screentofront does copy on some cards.
- it's really annoying to find out a routine that won't
- jerk and will be done by card-drivers.
-
- : >
- : > Opening a screen with twice the height or width and using
- : > ScrollVPort() to change the displayed region might be
- : > compatible with more graphics cards. With only one BitMap
-
- mhm scrollvport deals with viewports, isn't that something
- card-drivers can't do ? what about loadview then ?
-
- : > it should be guaranteed that no data has to be copied.
- : >
- : > So I'd try the double buffer functions and if that fails
- : > resort to one of the kludges below.
-
- : Hmm. If ScrollVPort() works on CyberGraphX, too, it
- : would be the perfect solution to get triple buffering.
-
- well: If the overscan prefs arent 320 horiz, you will see
- data you should not see. bummer. any ideas ?
-
- : I suppose it has quite a low overhead.. At least I recall
- : ScrollVPort() being in the list of functions which
- : were greatly optimized in v39.
-
- and already available bevore OS2.0 :)
-
- : -- _
- : a Stellar programmer _ //
- : "Amiga - back for the future" \X/
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-