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- Path: informatik.tu-muenchen.de!fischerj
- From: fischerj@informatik.tu-muenchen.de (Juergen "Rally" Fischer)
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.games,alt.sys.amiga.demos,in,comp.sys.amiga.advocacy,comp.sys.amiga.hardware,comp.sys.amiga.misc,comp.sys.amiga.graphics
- Subject: Re: Possible loss of the Copper (was Re: AB3D II beats Quake....)
- Date: 15 Apr 1996 14:41:58 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4ktn7m$bfj@sunsystem5.informatik.tu-muenchen.de>
- References: <4iu7hb$utt@coranto.ucs.mun.ca> <2726.6661T189T1181@mbox.vol.it> <4jmkma$4s0@valour.pem.cam.ac.uk> <4jsj9c$i7q@sunsystem5.informatik.tu-muenchen.de> <DpBp8G.7qK@novice.uwaterloo.ca> <4km1bv$irf@sunsystem5.informatik.tu-muenchen.de> <4kom17$rg@hell.team17.com>
- NNTP-Posting-Host: hphalle5.informatik.tu-muenchen.de
- Originator: fischerj@hphalle5.informatik.tu-muenchen.de
-
-
- In article <4kom17$rg@hell.team17.com>, boberg@team17.com (Stefan Boberg) writes:
- |> Organization: Team 17 Software Ltd.
- |> Lines: 24
- |> Message-ID: <4kom17$rg@hell.team17.com>
- |> References: <4iu7hb$utt@coranto.ucs.mun.ca> <2726.6661T189T1181@mbox.vol.it> <4jmkma$4s0@valour.pem.cam.ac.uk> <4jsj9c$i7q@sunsystem5.informatik.tu-muenchen.de> <DpBp8G.7qK@novice.uwaterloo.ca> <4km1bv$irf@sunsystem5.informatik.tu-muenchen.de>
- |> NNTP-Posting-Host: zonk.team17.com
- |> X-Newsreader: Forte Free Agent 1.0.82
- |> Xref: informatik.tu-muenchen.de comp.sys.amiga.programmer:91009 comp.sys.amiga.games:102062 alt.sys.amiga.demos:16854 comp.sys.amiga.advocacy:158401 comp.sys.amiga.hardware:128566 comp.sys.amiga.misc:121843 comp.sys.amiga.graphics:47142
- |>
- |> fischerj@Informatik.TU-Muenchen.DE (Juergen Fischer) wrote:
- |>
- |> >Darwin Ouyang (douyang@novice.uwaterloo.ca) wrote:
- |>
- |> >: <About virtual screens>
- |>
- |> >: And how does the Amiga "DO" this? Without the blitter?
- |>
- |> >No, with the copper. heard of it ? :)
- |>
- |> No it doesn't. It does use the copper to *load* the scroll
- |> registers, but how that is different (or better) than loading the
-
- Yep. no blitterscrolling. I currently sit on a hp. I can see it uses
- the blitterscrolling for virtual screen. this saves vram but is slow.
- when there's much load virtual screen will jerk like hell.
- This would never happen on a Amiga.
-
- |> (hold) scroll registers directly with the CPU, I don't know. The end
- |> result is the same, as the (S)VGA scroll values are copied to the
- |> pixel address register at VRetrace time just like on the Amiga.
-
- True, for one single screen cpu could do it. It's done by copper
- due to the vport concept (different resolution areas on screen).
-
- Reloading all screenspecs (256 color palette!) would cost cpu time,
- so copper makes sense here.
-
- |>
- |> > fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
- |>
- |>
- |> ===============================================================
- |> Stefan Boberg boberg@team17.com
- |> "This, like, sucks in ways that we've never seen stuff suck
- |> before, so it's kinda cool!" - B&B
- |>
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-
-