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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: 24 Feb 1996 13:59:20 GMT
- Organization: Dept. of Informatics, University of Oslo, Norway
- Message-ID: <1118.6628T725T1224@ifi.uio.no>
- References: <4f4ibc$gl9@news.cs.tu-berlin.de> <591.6610T1165T2102@login.eunet.no><1045.6611T753T2256@vip.cybercity.dk><4faoe1$47@sunsystem5.informatik.tu-muenchen.de><2991.6612T1034T625@vip.cybercity.dk><576.6613T1070T1730@login.eunet.no><1257.6614T57T922 <4gkknd$b1v@brachio.zrz.TU-Berlin.DE>
- NNTP-Posting-Host: gymir.ifi.uio.no
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP)
-
-
- >>Your are not using the CPU and the BLITTER at the same time in chipram are
- >>you??? Because that is very foolish! :) (read: SLOW!)
- >No, I don't. I even toggle blitternasty-bit at the importent places...
- But you are using a blitter-interrupt (or QBlit)?
-
- >>Anyway, to make sure I timed it.
- >>Using a PAL lowres screen with 256 colors, all interrupts off.
- >>c2p: Used 74 rasterlines on a 160x128 screen
- >>Copy: Used 73 rasterlines.
- >>I consider that as pretty equal.
- >Inside the error-delta for timings, I'd say.
- I use a small macro to store the raster postion before and after the
- routine, so it should be pretty accurate.
-
- Accutally, I think my routine must be 1 rasterlines slower than plain copy,
- because I optimised c2p8.s (1x1 c2p by Peter McGavin) quiet a bit yesterday.
- And I managed to sqeeze it down to 73 rasterlines (on the same amount of
- data, 20480 chunky bytes).
-
- So maybe I counted the cycles wrong in my 2x2 routine and have lost 2
- cycles/loop or someting!
-
- It won't matter much, but I'll fix it! :-)
-
-
- <sb>Ludde - Amiga Demo Coder
- <sb>Virtual Reality & Official Be developer
- <sb>ludvigp@ifi.uio.no
-
-