NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/sys/amiga/programmer/1813

Internet Message Format | 1996-08-05 | 3.8 KB

Path: informatik.tu-muenchen.de!fischerj
From: [e-mail] (Juergen "Rally" Fischer)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: TMapping again!
Date: 23 Jan 1996 18:19:43 GMT
Organization: Technische Universitaet Muenchen, Germany
Distribution: world
Message-ID: <4e38rv$[e-mail]>
References: <4d0ou6$[e-mail]> <Z31Wx*[e-mail]> <4d42di$[e-mail]> <4d5lvi$[e-mail]> <4d6v0t$[e-mail]> <4djj0t$[e-mail]> <4dlo7d$[e-mail]- <4e040q$[e-mail]>
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Originator: [e-mail]


In article <4e040q$[e-mail]>, [e-mail] (Philipp Boerker) writes:
|> Organization: Technical University of Berlin, Germany
|> Lines: 63
|> Message-ID: <4e040q$[e-mail]>
|> References: <4d0ou6$[e-mail]> <Z31Wx*[e-mail]> <4d42di$[e-mail]> <4d5lvi$[e-mail]> <4d6v0t$[e-mail]> <4djj0t$[e-mail]> <4dlo7d$[e-mail]-|>
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|>
|> [e-mail] (Juergen "Rally" Fischer) writes:
|>
|>
|> >|> >|> : Yes, I agree. Sharon, one of the coders of matrix, is actually a
|> >|> >|> : PC coder but his polygon engine on a 33 MHz 486 is slower than
|> >|> >|> : our (Sharon, Grond, Skyphos all/matrix) engine on a 25 MHz 030!
|> >|> >|> : That's the power of a large register set!
|> >|>
|> >|> >well is you polyengine still faster using 8 planes ? ;)
|> >|>
|> >|> I was refering to 8bit.
|> >|>
|> >|> >he got a non-local-bus vga ? ;)
|> >|>
|> >|> Local bus...
|>
|> >ooh =:o
|>
|> >well hm... polygon is just writing 32bit values to vram.
|>
|> >The 030 will do this at on AGA 7MB/sec. Or do you refer to
|> >A3000+gfx-card ? ;)
|>
|> No, A4000-30-25
|> Copying to VRAM/CHIPMEM is not the main speed problem on both platforms...
|>
|> >how much fps ? is it mem overwritten multiple times (fastmem render ?).
|> >then fastmem speeds cares.
|>
|> Fastmem is faster on PC as well.
|>
|> >are you sure the PC version is as optmized?
|>
|> There are two reasons why the engine is faster:
|> We have 15 registers during the mapping while PC has

I'm really not a PCer but interested in truth. a chunky
polygone engine needs less registers anyway. on fast architectures
outerloops care little, raw mem speed is the question.

so as long as you won't loose time on other parts (z sort etc etc)
I don't get it...

|> to load from RAM. And hey, it was Sharon's first engine...
load from ram ? a polyong engine ???

|> A lot of algorithmic optimizations have been added as well.
I think so.

|>
|> >|> >my friend always argues that you could see the cache as big register
|> >|> >set on intel
|> >|>
|> >|> Then ask him how he does a
|> >|> "shift left with mask out and insert" rdest,rsource1,rsource2
|> >|> within 1 cycle from datacache...
|>
|> >can 680x0 do that ?
|>
|> No, 68k is out of the race anyway. The example above was refering to
|> PPC.
|>
|> > x86 operations with datacache as destination need
|> >33 cycles AFAIK. add.l D0,var or in x86 add eax,var
|>
|> No! Not more than 3 c even on 486!

aeh :) somehow the "3" key gave multiple contact :) 33 would be slower
than a chipmem acess ;)

|>
|>
|> Greets,
|> Phil.
|> ----------------------------
|> grond/matrix
|> [e-mail]
|> ----------------------------
|>
------------------------------------------------------------------------
   [e-mail] (Juergen "Rally" Fischer)   =:)