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- Path: Norway.EU.net!usenet
- From: patrick.hanevold@login.eunet.no (Patrick Hanevold)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: doubling pixels horizontally
- Date: 21 Feb 1996 12:36:14 GMT
- Organization: EUnet Norway
- Message-ID: <2729.6625T787T2734@login.eunet.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>
- <2182.6619T1129T1416@login.eunet.no> <4gbi2c$104@sunsystem5.informatik.tu-muenchen.de>
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-
-
- >: We didnt steal your code. Ludvig pedersen wrote the cpu passes, and I wrote
- >: the blitterpasses.
- >naah you can't steal, it's on my homepage for all Amiga coders.
- >With new A1200 beeing 030-40 but AGA, 3pass solutions will live a
- >long time :)
- Im more into 4pass i think.
-
- >: >So what is faster than copying data to chipmem ? nothing ;)
- >: We do 2 cpu passes for free now, and it is non-scrambled. If I remeber
- >: corectly your was scrambled??
-
- >I got a 1pass routine currently, but I guess the version on my
- >homepage is still blitter-only.
- >My ";)" refered to the fact that the c2p is "free" on 020-14+fast
- >for lots of fx.
- >How to call it, if blitter is faster than cpu rendering ?
- >"virtual free c2p" ? :)
- >currently "free c2p" is defined as "cpu c2p at speed of cpu copy
- >AND c2p ready when cpu ready".
-
- >Well, as a 030 board can store more than 4mb/sec, it will have
- >more trouble doing c2p "for free" than a A4000 (what about
- >040 boards on A1200 ? we got too little data...)
-
- >If there will be a 3 pass cpu-only c2p on 030-50 at 4mb/sec,
- >is it for free ? but then 2pass 5mb/sec wouldb be "more free" ;)
-
- >: The blitter isnt slower on a 030 is it? :)
-
- >it is slower on a 020-14 if you rotzoom. or scroll.
- >It's all quite complex, that's why ideal software supports
- >from 0pass cpu up to 3pass cpu, configurable in a rc file.
- >each demo-effect might need an own rc file!
-
- >: Again. The cpu passes of the new version is about %40 faster, stil doing
- >: two passes.
- >Again :) The cpu passes will be rather 40% slower on my 020-14 ;->
- >In fact, 1 pass on 020-14+fast is 100% slower than plain copy.
- >We need more definite vocabulary.
- I would by a cooler card if I where you. :)
-
- >: Now 2x2 is as fast as it can get, so you certantly dont want to do more
- >: passes with the CPU do you? I guess your thinking of 1x1/1x2/2x1.
-
- >not really! how much passes you do depends on the effect and on the
- >cpu, not on the resolution. Ok, if you do little pixels, you get 50Hz
- >with any method, that's why less ideal methods are also optimal on 2x2
- >just because monitor is too slow ;)
-
- >Adjust according to cpu+effect, not resolution. will always work.
- When I say c2p, I mean the whole thing. (LC2P:)
-
- >: >c00l showoff on gfx-cards and maybe AGA+ BTW.
- >: Nice. I would use the rtg.library on gfx-cards thoug.
-
- >But then rtg maybe doesn't include chunky on AGA+! Wouldn't that
- >be mega-pity your code supports cards but would fail on A1300!
- If it doesnt support macines without gfx-cards, it can just fail to open,
- and then you do normal c2p.
-
- >If you do a rtg version, better also supply a gfx.lib version.
- Why?
-
- <sb>Patrick Hanevold - Virtual Reality developer
- <sb>patrick.hanevold@login.eunet.no
- <sb>Amiga and official Be developer
-
-