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- Path: hercules.zrz.TU-Berlin.DE!rawneiha
- From: rawneiha@hercules.zrz.TU-Berlin.DE (Philipp Boerker)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: doubling pixels horizontally
- Date: 13 Mar 1996 12:24:53 GMT
- Organization: Technical University Berlin, Germany
- Message-ID: <4i6eql$qpo@brachio.zrz.TU-Berlin.DE>
- References: <4f4ibc$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><576.6613T1070T1730@login.eunet.no><1257.6614T57T922
- NNTP-Posting-Host: hercules.zrz.tu-berlin.de
-
- ccc6004@vip.cybercity.dk (Hans Henrik Happe) writes:
-
-
- >Philipp Boerker ( rawneiha@hydra.zrz.TU-Berlin.DE ) wrote:
- >> ludvigp@ifi.uio.no (Ludvig Pedersen) writes:
-
-
- >>>>>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)?
-
- >> Yes, I did my own interrupthandler.
-
- >Is this a system interrupthandler??
-
- No, it is impossible to get in charge of the blitterint without some
- hardware banging.
-
-
- > I thougt graphics.library always were in charge
- >of the blitter interrupt (and it don't even use it for it's own rutines, exept QBlit).
-
- Yes, it is...until you take it away from it ;)
- If you want to control the blitter via OS you could launch another task from your
- starting task that will do a OwnBlitter(), start the blitter via OS and then
- does some WaitBlit()'s until the blitter is ready. Your main task would have
- to request a conversion by sending a message to that task. The task would have to
- do a WaitPort() in the meantime.
- I didn't want to do that...
-
- >btw. Why is it slower to write to chipmem with the CPU and the blitter at the samme time?
-
- Because the blitter is stealing DMA from the CPU.
-
- >Hans Henrik Happe
- > Goat / Sumpen
-
- >You can kill the human race, but you can't kill the AMIGA.
-
- I'd still prefer the second...
-
- Greets,
- Phil.
- grond/matrix
-