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From: eps@toaster.SFSU.EDU (Eric P. Scott)
Newsgroups: comp.sys.next
Subject: Re: Towards a cheap Head Mounted display
Message-ID: <1464@toaster.SFSU.EDU>
Date: 5 Apr 91 01:39:32 GMT
References: <5599@media-lab.MEDIA.MIT.EDU> <mdixon.670723893@thelonius>
Reply-To: eps@cs.SFSU.EDU (Eric P. Scott)
Organization: San Francisco State University
Lines: 28

In article <mdixon.670723893@thelonius> mdixon@parc.xerox.com
	(Mike Dixon) writes:
>some variant of this question seems to turn up quite regularly; the
>answer is that it's trivial.  postscript doesn't actually care what
>resolution your device is -- it just generates bitmaps based on the
>current transformation.  tell the window server you want to render
>to a machportdevice,

Unfortunately, that's really not the correct answer here;
machportdevice is for implementing things that look like
printers (e.g. printers and FAX machines)--things where
one uses showpage/copypage operators to render completed
pages.

Instead, the original poster needs to look into adding a
secondary display screen; this means a driver in
/usr/lib/NextStep/Displays/ and appropriate NetInfo "screens"
entries.  Look at how the NeXTdimension support works in 2.1.

>                     and it gives you an initial transformation of
>1 pixel per postscript point; if you want something else, just use
>the 'scale' operator.

No, it gives you the initial transformation you specify as a
mandatory argument to machportdevice.  See Chapter 4 of the
NextStep Reference.

					-=EPS=-