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- Path: ifi.uio.no!usenet
- From: ludvigp@ifi.uio.no (Ludvig Pedersen)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: doubling pixels horizontally
- Date: 2 Mar 1996 16:36:21 GMT
- Organization: Dept. of Informatics, University of Oslo, Norway
- Message-ID: <1995.6635T1015T220@ifi.uio.no>
- References: <4f4ibc$gl9@news.cs.tu-berlin.de> <591.6610T1165T2102@login.eunet.no><1045.6611T753T2256@vip.cybercity.dk><4faoe1$47@sunsystem5.informatik.tu-muenchen.de><2991.6612T1034T625@vip.cybercity.dk><576.6613T1070T1730@login.eunet.no><1257.6614T57T922@vip.cybercity.dk><1225.6615T1229T800@login.eunet.no><1140.6616T51T1538@vip.cybercity.dk><3764.6622T781T478@ifi.uio.no><4gbkq8$104@sunsystem5.informatik.tu-muenchen.de>
- <2038.6625T1088T2898@ifi.uio.no> <2379.6627T121T1144@vip.cybercity.dk>
- <2428.6629T1299 <4h4jgs$n9l@sunsystem5.informatik.tu-muenchen.de>
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-
- >|> >dual playfield bit in bplcon0 (tag VC_DUALPF_Disable). Now you have a way
- >|> >of scrolling the even and odd bitplanes independently and thats what you
- >|> >need for a blitterscreen. Mask out the unwanted pixels with system
- >|> >sprites and flip every frame to make it look like a real 2x2. This way
- >|> >you don't have to scroll each line idependently.
- >|> I have to scroll every line independently if I'm using sprite-
- >|> dithering. Because its not only the sprite-dithering that moves but the
- >|> graphics as well.
-
- >he describes a way to do stripe look, not ghost look :)
- >stripe look: looks not as smooth as ghost lock but is symetric
- > better for lines.
- >laced stripe look: what a mess! much worse than PAL laced...
-
- Hahaha....you got it all wrong.
-
- It is ghost-look. But the dither is moved 50 fps with 2 copperlist.
-
- Copper 1 a pixel looks like this:
-
- --XX
- XX--
-
- Copper 2 a pixel looks like this:
-
- XX--
- --XX
-
- So when those two are "merged" it is a full 2x2 pixel
-
- XXXX
- XXXX
-
- No strip-lace, no mess! It looks almost as good as real 2x2 and
- in motion it somethimes almost look better. Because it doesnt look so blocky.
-
- Our routine should have been released now. But Patrick is working
- on a very-easy-to-understand complete example in C. So it has been delayed a
- few days. But now it also opens on an intuition screen which also works on
- DBLPAL etc. :-)
-
- BTW: I have added to you the mail-list so you will get it directly as soon as
- it is released. Just to make sure you don't miss it! ;)
-
- >|> >for now in exploring the Amiga system. Fill me in on any interresting
- >|> >results you have got, Thanks!
- >|>
- >|> Thanks it should be worth looking at. :)
- >V40 mhmhm. why didn't they put 1x2 in V39 already grrrrr.
- >They began thinking about games when they built CD32. too late.
- It would have been so much easyer for us. :-/
-
-
- <sb>Ludde - Amiga Demo Coder
- <sb>Virtual Reality & Official Be developer
- <sb>ludvigp@ifi.uio.no
-
-