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- Path: w353zrz.zrz.TU-Berlin.DE!rawneiha
- From: rawneiha@w353zrz.zrz.TU-Berlin.DE (Philipp Boerker)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: doubling pixels horizontally
- Date: 7 Feb 1996 14:07:44 GMT
- Organization: Technical University Berlin, Germany
- 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!
- And if you mask out like this:
- even scanline: 0246...
- odd scanline: 1357...
- you will reduce flicker even more I guess!
-
- >Hans Henrik Happe
- > Goat / Sumpen
-
- Greets,
- Phil.
- grond/matrix
-