Article View: comp.sys.amiga.tech
Article #7565Re: Simple Frame Buffer boards
From: Randell Jesup
Date: Wed, 19 Dec 1990 01:59
Date: Wed, 19 Dec 1990 01:59
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1479 bytes
In article <1421@mpirbn.mpifr-bonn.mpg.de> p554mve@mpirbn.UUCP (Michael van Elst) writes:
>As I said, it is _easier_ to write code for a memory mapped framebuffer
>but doesn't imply major performance loss. Think of a framebuffer addressed
>through the concatenated row and column number which isn't a flat contigous
>memory at all but which is surely faster to access for graphics purposes.
Worse yet, if you need to access the frame buffer via registers,
you either have to allow only one task to use it (ever), or save/restore
those register on every task swap. Fun fun fun.
--
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com BIX: rjesup
The compiler runs
Like a swift-flowing river
I wait in silence. (From "The Zen of Programming") ;-)
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<16654@cbmvax.commodore.com>Path:
arc1-ca.pugleaf.net!utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!agate!eos!shelby!rutgers!cbmvax!jesupReferences:
<916@boing.UUCP> <23699@grebyn.com> <918@boing.UUCP> <1411@mpirbn.mpifr-bonn.mpg.de> <1990Dec5.165513.16570@eagle.lerc.nasa.gov> <1421@mpirbn.mpifr-bonn.mpg.de>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!agate!eos!shelby!rutgers!cbmvax!jesup From: jesup@cbmvax.commodore.com (Randell Jesup) Newsgroups: comp.sys.amiga.tech Subject: Re: Simple Frame Buffer boards Message-ID: <16654@cbmvax.commodore.com> Date: 19 Dec 90 01:59:35 GMT References: <916@boing.UUCP> <23699@grebyn.com> <918@boing.UUCP> <1411@mpirbn.mpifr-bonn.mpg.de> <1990Dec5.165513.16570@eagle.lerc.nasa.gov> <1421@mpirbn.mpifr-bonn.mpg.de> Reply-To: jesup@cbmvax.commodore.com (Randell Jesup) Organization: Commodore, West Chester, PA Lines: 16