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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: doubling pixels horizontally
- Date: 7 Feb 1996 17:47:53 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4faok9$4r@sunsystem5.informatik.tu-muenchen.de>
- References: <4f4ibc$gl9@news.cs.tu-berlin.de> <591.6610T1165T2102@login.eunet.no> <1045.6611T753T2256@vip.cybercity.dk> <4fabng$f6p@brachio.zrz.TU-Berlin.DE>
- NNTP-Posting-Host: hphalle1a.informatik.tu-muenchen.de
- Originator: fischerj@hphalle1a.informatik.tu-muenchen.de
-
-
- In article <4fabng$f6p@brachio.zrz.TU-Berlin.DE>, rawneiha@w353zrz.zrz.TU-Berlin.DE (Philipp Boerker) writes:
- |> Organization: Technical University Berlin, Germany
- |> Lines: 32
- |> Message-ID: <4fabng$f6p@brachio.zrz.TU-Berlin.DE>
- |> References: <4f4ibc$gl9@news.cs.tu-berlin.de> <591.6610T1165T2102@login.eunet.no> <1045.6611T753T2256@vip.cybercity.dk>
- |> NNTP-Posting-Host: w353zrz.zrz.tu-berlin.de
- |>
- |>
- |>
- |> >You can also render only every 2nd pixels, mask out those you don't want with sprites,
- |> >and then:
- |>
- |> >loop
- |> > 1st frame: show pixel 02468... mask out 13579...
- |> > 2nd frame: show pixel 13579... mask out 02468...
- |> > jump loop
- |>
- |> >In the 2nd frame you shift (scroll) the bitplanes 1 to the right.
- |> >This looks allmost as the real double pixels (Gives very little flicker) and you only
- |> >have to write half as much to the chip mem.
- |> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- |> that's the reason why I was looking for a hardware trick...
- |>
- |> >This effect can be done using only the copper.
- |>
- |> Hey, great idea! But someone wrote to me that there is a "extra-lores" monitor that
- |> displays 160*128. If this is a 15 kHz monitor I bet that there is a hardware trick to
- |> do it!
-
- On a _31khz_ monitor, LoRes dotclock will show pixels of 2 times more width.
-
- |> And if you mask out like this:
- |> even scanline: 0246...
- |> odd scanline: 1357...
- |> you will reduce flicker even more I guess!
-
- but then you blur togehter 2 pix. wasn't the aim more resolution ?
- take care of what you want, else you do lotsa effort and get nothing.
-
- |>
- |> >Hans Henrik Happe
- |> > Goat / Sumpen
- |>
- |> Greets,
- |> Phil.
- |> grond/matrix
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-