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- Newsgroups: comp.arch
- Path: sparky!uunet!orca!mesa!rthomson
- From: rthomson@mesa.dsd.es.com (Rich Thomson)
- Subject: Re: Graphics Systems
- Message-ID: <1992Jul23.000014.9936@dsd.es.com>
- Sender: usenet@dsd.es.com
- Nntp-Posting-Host: 130.187.85.21
- Reply-To: rthomson@dsd.es.com (Rich Thomson)
- Organization: Design Systems Division, Evans & Sutherland, SLC, UT
- References: <1992Jul16.205220.610@darkcube.radig.de> <4398@rosie.NeXT.COM>
- Date: Thu, 23 Jul 92 00:00:14 GMT
- Lines: 33
-
- In article <4398@rosie.NeXT.COM>
- pgraff@next.com (Peter Graffagnino) writes:
- >Actually, we have no such coprocessor, all compositing (blitting) is done
- >with the host CPU. Our model is to have a high-bandwidth memory subsystem
- >where VRAM and DRAM are peers with the same performance characteristics.
- >Since NeXTSTEP tends to draw in window backing stores (DRAM) just as
- >frequently (if not more) than VRAM, its hard to see how a graphics
- >accelerator can help (unless it has its own DRAM/VRAM virtual memory
- >subsystem with a CPU/MMU (ala NeXTdimension)). With this CPU-centric
- >graphics architecture, your graphics performance rides the same (steep)
- >curve as your general CPU performance -- customers like it when
- >*everything* gets faster when they upgrade to a faster CPU.
-
- Of course, everything is also as slow as the CPU. Isn't this the kind
- of system that caused people to create graphics accelerators in the
- first place (i.e. the central CPU was the bottleneck)? What does NeXT
- plan to do when people's thirst for graphics rendering increases?
- Now that NeXT will be supporting 3D applications with NeXT Step 3.0
- with "quick renderman", they may find that relying on the CPU will not
- get them the performance needed to render many thousands of polygons
- interactively. On the other hand, NeXT may not consider these kinds
- of 3D apps to be their market.
-
- -- Rich
-
- PS: how can I obtain a specification of "quick renderman"? Calls to
- Pixar routed me to the NeXT tech. support line which would only tell
- me that they will be offering a "3d kit" in release 3.0.
- --
- Repeal the personal income tax; vote Libertarian in 1992.
- Disclaimer: I speak for myself, except as noted; Copyright 1992 Rich Thomson
- UUCP: ...!uunet!dsd.es.com!rthomson Rich Thomson
- Internet: rthomson@dsd.es.com IRC: _Rich_ PEXt Programmer
-