home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.amiga.programmer
- Path: sparky!uunet!usc!rpi!batcomputer!cornell!rochester!rit!isc-newsserver!eas3714
- From: eas3714@ultb.isc.rit.edu (Ezra Story)
- Subject: Re: Attn Commodore: Yo
- Message-ID: <1992Dec15.055321.16364@ultb.isc.rit.edu>
- Originator: eas3714@ultb
- Lines: 25
- Sender: eas3714@ultb.isc.rit.edu (E.A. Story)
- Nntp-Posting-Host: ultb-gw.isc.rit.edu
- Organization: Rochester Institute of Technology
- X-Newsreader: Arn V1.00 beta rel2
- Date: Tue, 15 Dec 1992 05:53:21 GMT
-
- Rockerboy writes:
-
- > I Write:
- > > If I open up a screen, attach a bitmap, and query its attributes, I can
- > > make certain assuptions about that screen and bitmap. If the bitmap is
- > > shown to be a normal amiga interleaved bitmap in chip memory, nothing
- > > prevents me from using the blitter directly to write to the bitmap...
- > > Remember we're not talking about PageStream here... we're talking about a
- > > demo or a game.
- >
- > How can you do it if you have no information on how the blitter works?
- > _The lack of data on the hardware_ prevents you from safely using the
- > blitter, or any other chips, for that matter.
-
- Ah, but I do... The 2.0 hardware reference manual has all the info I need.
-
- Using the OS to do blits is preferable, of course.. but as long as there are
- Dis/OwnBlitter() and Q(S)Blit() calls you can be pretty sure that the blitter
- will work like it always has. Note that the only other hardware direct access
- the OS allows (other than resources..) is Copper instructions.. and since
- those are used just as a medium for accessing the hardware anyway, the only
- areas that are legal are color registers when ECS is active and the
- blitter.
-
-
- --
- "THAT is a DRY turtle. That turtle is NOT moist!"
- Ezra Story, a student at RIT, and
- eas3714@ultb.isc.rit.edu, his trusty(?) mailing address.
-