home *** CD-ROM | disk | FTP | other *** search
- 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: 20 Feb 1996 04:18:20 GMT
- Organization: Technische Universitaet Muenchen, Germany
- Distribution: world
- Message-ID: <4gbi2c$104@sunsystem5.informatik.tu-muenchen.de>
- References: <4f4ibc$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>
- NNTP-Posting-Host: hphalle5.informatik.tu-muenchen.de
- X-Newsreader: TIN [version 1.2 PL2]
-
- Patrick Hanevold (patrick.hanevold@login.eunet.no) wrote:
-
- : 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 :)
-
- : >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.
-
- : 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.
-
- : >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 you do a rtg version, better also supply a gfx.lib version.
-
- : <sb>Patrick Hanevold - Virtual Reality developer
- : <sb>patrick.hanevold@login.eunet.no
- : <sb>Amiga and official Be developer
- ------------------------------------------------------------------------
- fischerj@Informatik.TU-Muenchen.DE (Juergen "Rally" Fischer) =:)
-
-