NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/sys/amiga/programmer/1399

Internet Message Format | 1996-08-05 | 4.2 KB

Path: informatik.tu-muenchen.de!fischerj
From: [e-mail] (Juergen "Rally" Fischer)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Demo/game to OS friendly part II
Date: 18 Jan 1996 18:08:20 GMT
Organization: Technische Universitaet Muenchen, Germany
Distribution: world
Message-ID: <4dm2ak$[e-mail]>
References: <4csu3p$[e-mail]> <4cu1jn$[e-mail]> <4cv7mb$[e-mail]> <4d0k83$[e-mail]> <4d6am7$[e-mail]> <4ddhou$[e-mail]> <4deshh$[e-mail]> <4dg16j$[e-mail]> <4djdn2$[e-mail]> <4dk1km$[e-mail]>
NNTP-Posting-Host: hphalle5.informatik.tu-muenchen.de
Originator: [e-mail]


In article <4dk1km$[e-mail]>, [e-mail] (Michael van Elst) writes:
|> [e-mail] (Juergen "Rally" Fischer) writes:
|>
|> >how to interpret it ? So is there a OSy way to finally get a copper list
|> >which is changing 102 each line ?
|>
|> Yes. But no abstract way. You actually have to use copper lists.
|>
|> >IF so, then I guess I will need to use loadview() for buffering,
|> >no Amiga-M :\
|>
|> That's what you guess.

:)
having 256 vports you can't use scrollvport for buffering.
well, maybe just using new OS3.0 buffering can do it without. maybe not.
(does changescreenbuffer() imply a new ucopl ?)

problem: I need 2 copperlists for displaying _1_ buffer, switching
between them each frame, interlacing the ghost look.

maybe there is a way using the 2 coplists used for normal interlace,
but am I right this is going deeper than CMOVE() etc.

the goal of using OS is for example working on all monitors, but
then I have to do special variants if I poke 102...

|>
|> >So the OS compliant version will behave more nasty to the user on
|> >OS3.0, which is the price for it working on 4.0 ?
|>
|> And that's your gorgous mind assuming things.
|>
|> >is there ham emulation on gfx-cards btw. Could I also run a ham8 wb on draco ?
|>
|> No, you couldn't.

hmmm. Imagine OS comliant software letting me draw/watch ham8 images.
So I will be able to do 18bit drawing on my vanilla A1200, but not
on draco ? not good, really not good. Needing a special viewer for
a special driver sucks.

would be no problem redirecting the data to a special renderer if
ham bit is set in screen struc (I guess the gfx-card got a 24bit mode).

|>
|> >returns "okidoki" on A1200, "careful!" on A4000 and "you damn c0d3r" on A3000 :D
|>
|> That's what you do all the time. No ?

my old intros did check nothing. I intend my new ones not crashing on draco
(well, I hope they soon get a audio.device).

true, I still intend to do copper hacks, but a demo/game that lets you
select OS-fallback is imho 100% ok.
you won't believe it, but I enjoy my current programs not disabling OS,
if they crash OS had enough time to validate hd after compile, so no
validate after reboot :)

but hardwarehacks also got advantages: imageine copper is gone to
nowhere-land due to a bug. anything else is ok, only display sucked up.
what to do ?
start Excess/Riot and press right mouse button for return, and voila,
copper is reset to intuition view ;))


|>
|> >Well the only component that could make my copper routines crash in
|> >a future AGA machine is "kick 3.0". After displaying a warning I will
|> >let user select, brave OCS/ECS/AGA users _might_ get more speed instead
|> >of a crash on OS4.0
|>
|> Again you simply assume something.

no, I hope! if done the way I describe, the code _will_ run on OS4.0
(unless it got a bug itself). well I should have mentioned the select
is between "copper" and "OS". One brave user telling if it also works
on OS4.0 (precondition AGA&PAL) will be enough ;)

|>
|>
|> --
|>                                 Michael van Elst
|>
|> Internet: [e-mail]
|>                                 "A potential Snark may lurk in every tree."
------------------------------------------------------------------------
   [e-mail] (Juergen "Rally" Fischer)   =:)