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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: Doublebuffered window??
- Date: 12 Jan 1996 18:35:52 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4d69m8$i0h@sunsystem5.informatik.tu-muenchen.de>
- References: <4bfe05$l11@katiska.clinet.fi> <4bgmqq$kh6@serpens.rhein.de> <4cmftc$1g1@sunsystem5.informatik.tu-muenchen.de> <4cmrgp$5bs@serpens.rhein.de>
- NNTP-Posting-Host: hphalle8a.informatik.tu-muenchen.de
- Originator: fischerj@hphalle8a.informatik.tu-muenchen.de
-
-
- In article <4cmrgp$5bs@serpens.rhein.de>, mlelstv@serpens.rhein.de (Michael van Elst) writes:
- |> fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) writes:
- |>
- |> >But in the sense of rastersplit-free update, I would sugest to
- |> >use VBeamPos() to wait for bottom of window and hope that
- |> >blitbitmaprastport() will do it under (1 frame - windowheight).
- |>
- |> VBeamPos() ? Busy waiting ? At least use WaitBOVP() to get a chance
- |> of an optimization.
-
- Well, but if the window is at top, there is less time to blitter as
- WaitBOVP does wait for bottom of the screen, not the window.
-
- Non-busy-wait WaitBoWin would have been a very useful lib-routine...
-
- |>
- |> Anyway, synchronized rendering to windows isn't supported. For
- |> native screens you can do low level QBSBlit() or higher level
- |> GELS calls. GELS is even retargetable to some degree.
-
- I guess they also sync with vblank ?
-
- The aim is to get blitter working just when beam has scanned the
- whole window data, something that might be true a large amount of
- time bevore vblank occurs.
-
- The only non-chipset-only method I see is dealing with VBeamPos
- (more cpu load, but you can blit a larger window without rastersplit).
-
- |>
- |> Regards,
- |> --
- |> Michael van Elst
- |>
- |> Internet: mlelstv@serpens.rhein.de
- |> "A potential Snark may lurk in every tree."
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-