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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: 17 Feb 1996 14:12:42 GMT
- Organization: Dept. of Informatics, University of Oslo, Norway
- Message-ID: <1281.6621T599T1509@ifi.uio.no>
- References: <4f4ibc$gl9@news.cs.tu-berlin.de> <591.6610T1165T2102@login.eunet.no><1045.6611T753T2256@vip.cybercity.dk><695.6611T1193T2676@login.eunet.no><729.6615T699T2129@vip.cybercity.dk><807.6616T1079T1489@login.eunet.no><896.6617T632T386@vip.cybercity.dk>
- <501.6617T1089T2050@login.eunet.no> <947.6617T1250T2344@vip.cybercity.dk>
- NNTP-Posting-Host: gymir.ifi.uio.no
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP)
-
- >Patrick Hanevold ( patrick.hanevold@login.eunet.no ) wrote:
- >>>>>>>You can also render only every 2nd pixels, mask out those you don't
- >>>>>>>want
- >> ^^^^^^ ^^^^^^^^^^
- >>>> Now you are talking about Chunky, right?
- >>>Yep!... and I have never talked about anything else... infact I have
- >>>never made a copperscreen.
- >> Now I'm with you, so you dont/wouldnt render every 2nd pixel then?
- >> It was you who wrote that line, wasnt it?
- >No way! I only stated that you could make a blitterscreen (with spritemask)
- >look like a real 2x2 screen.
- >But now you state that you can do it faster. I don't how. The only problem it
- >has is the DMA time. You pratically use all the Amiga custom gfx chip
- >(sprites, copper, blitter, CPU to chipmem writes). But optimising it 40% -as
- >you stated in an erlyer message - is hard for me to beleave. Mine is doing
- >close to 1 frame on fullscreen 2x2 (20480 pixels).
-
- Ours *is* going one frame and it uses only as much time as it takes to copy
- the byffer (20480 pixels) to chipram.
-
- - Linear chunky buffer
- - CPU and Blitter is NOT working at the same time in chipram!
- - CPU time per frame is 4-5 ms. (About 70-75 rasterlines)
-
-
- <sb>Ludde - Amiga Demo Coder
- <sb>Virtual Reality & Official Be developer
- <sb>ludvigp@ifi.uio.no
-
-