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- Path: news.ao.net!news
- From: Jude Anthony <jude@p3.enzian.com>
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.games,alt.sys.amiga.demos,in,comp.sys.amiga.advocacy,comp.sys.amiga.hardware,comp.sys.amiga.misc,comp.sys.amiga.graphics
- Subject: Re: AB3D II beats Quake....
- Date: Wed, 27 Mar 1996 09:41:51 -0800
- Organization: Enzian Technology
- Message-ID: <31597DDF.5EF8@p3.enzian.com>
- References: <Pine.NEB.3.92.960322022805.186D-100000@vicki.cnw.com> <16035.6656T1166T829@mbox.vol.it> <4j4jkt$9c5@cwis.isu.edu> <4ja4j8$dtm@uvapsy.psy.uva.nl>
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-
- Bert Dorhout wrote: (paraphrased for space)
-
- > I have a 'freshmans' view on this whole thing; that I'll admit.
- > So correct/teach me if I'm wrong.
-
- > As for quality/speed; I guess it is easier/better perhaps to move to
- > non home-brewed chips, but use standard high quality, cheap video cards
- > instead.
-
- We seem to be having a great deal of dispute even on that point. There is
- one faction who believes the Amiga custom chips are either faster/better
- than the PCI cards now available, or could easily be redesigned to be so;
- the other faction believes that the PCI cards are blazing fast, and that
- programming them through an "appropriate Games API" would be at least as
- speedy as banging on the present hardware. Many Amiga enthusiasts are in
- the first group; several others are in the second group, and often use
- Dave Haynie as a reference.
-
- > As for a minimum standard, however... If AT doesn't set a minimum,
- > [animation speed, programmer considerations]
- > no insurance the video card is fast enough or in other words: WHAT
- > specs can a programmer see as the minimum on which he/she can COUNT????
-
- Motorola keeps a copy of the CHRP specs available for personal use at:
- http://www.austin.ibm.com/tech/chrp/hrprch.bk.html
- and I am ready to paraphrase them. Looking at "Portable" and "Personal"
- systems (I assume no one is too interested in the "Server" system for this
- discussion) I find the following audio and video specs.
-
- Both portable and personal systems must support 16bit, stereo, 22.05Khz
- and 44.1Khz, full duplex audio. (That's CD frequency and half CD
- frequency, both recording and playback.)
-
- Both portable and personal computers must support Bi-Endian graphics
- (Motorola byte ordering and Intel byte ordering), color and resolution at
- least 640x480x8 LFB (Linear Frame Buffer, or chunky mode). Personal
- systems must support 1024x768 resolution. Portable systems "may provide
- screen resolution in accordance with current state-of-the-art LCD
- technology." Hardware support for VGA is recommended, as some operating
- environments will experience performance enhancements. Later in the
- document, it is disclosed that certain OSs may require other graphic and
- audio requirements, such as bitplane graphics. (In other words, AT could
- require a certain card, or certain capabilities, to run AmigaOS on a CHRP
- system; these capabilities would have to be a superset of the CHRP
- requirements.)
-
- > What graphic mem speed, what 'standard' chip set???
- > Should we all program for VGA and up, NOT optimally using the modern
- > chipsets, or should we put on the box "This game runs on S3 + DSP or
- > better",
-
- Several games already say they need 604x480x256 or better. As for
- "standard" chip sets, the idea here is RTG; you program to the OS's
- graphics API, and the OS hands off to the graphics drivers, which take
- care of specific chip sets. That way you can change cards and chipsets
- without problems, as long as you install the proper driver. As for
- graphic mem speed...
-
- We have a few PReP machines (predecessor to CHRP) out back where I work.
- We're using them for a simulation of a helicopter, and we're modeling the
- instruments for the instructor station. We rendered certain scenes using
- OpenGL on three configurations with equivalent memory (and equivalent
- processors, where possible). The standard Motorola PowerStack (built-in
- video interface) finished in 15ms. The PowerStack with third-party PCI
- graphics card finished in 13ms. The Silicon Graphics Indigo2 finished in
- 23ms. All in all, I'd say the speed of the graphics subsystem is
- sufficient for personal and portable computer use.
-
- This is getting too long, and someone is sure to attempt to invalidate the
- whole thing based on one typo I've made somewhere. So let me summarize
- and get the hell out:
-
- I have provided information for you about the PPCP (nee CHRP)
- specifications. You can judge for yourself whether or not the required
- hardware specs fail, meet, or exceed the current Amiga hardware specs (or
- what you imagine Amiga hardware could be easily developed into). My last
- thought will be that the animation you propose would at least run on any
- Amiga CHRP system. For users who had purchased their systems with better
- graphics cards, it would run faster; for users who had purchased their
- systems with the minimum requirements, it would run slower.
-
- Later,
- GreyFox
- jude@p3.enzian.com
-