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From: cpetterb@es.com (Cary Petterborg)
Newsgroups: comp.graphics
Subject: Re: PEX using PHIGS (was Re: PEX, PHIGS, DEC5000?)
Message-ID: <CPETTERB.91Mar19102031@mickey.es.com>
Date: 19 Mar 91 15:20:31 GMT
References: <1991Mar15.190013.7415@neon.Stanford.EDU>
	<1991Mar17.235026.4718@dsd.es.com> <10030@exodus.Eng.Sun.COM>
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In-Reply-To: gds@atticus's message of 19 Mar 91 02:29:10 GMT
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In article <10030@exodus.Eng.Sun.COM> gds@atticus (Greg Schechter) writes:

> In article <1991Mar17.235026.4718@dsd.es.com>, rthomson@mesa (Rich Thomson) writes:
> >PEX is PHIGS/PHIGS-PLUS Extensions to X, so if they are using PEX they
> >are using PHIGS (at least for output -- PEX doesn't attempt to cover
> >PHIGS style input on the server side; input happens through a beast
> >called the "PHIGS Monitor" which runs as a separate process that
> >interacts with a PHIGS client program).
> >
> >So, if you are using PEX you are using PHIGS.
> >

> Actually, this is not true.  PEX is simply a protocol, just like X.
> However, it is an extension to the core X protocol.  It simply relates
> specific byte encodings to specific server actions on the part of the
> PEX extended server.  It just so happens that PEX was designed
> specifically to support the functionality that PHIGS and PHIGS PLUS
> offer, but it is not an Application Programming Interface.

	<stuff deleted>

> -- Greg

Note what Rich says, "if you are using PEX you are using PHIGS."  He
is correct in this because currently there is no other application
interface to PEX, but PHIGS.  Using PEX (the extensions to X, not X)
implies that you are dealing with the extensions that are only available
through PHIGS, unless you are crazy enough to set up the protocol packet
yourself. (not a good idea unless you REALLY know what you are doing)

Cary
--
_______________
Cary Petterborg					   (801)582-5847 x6446
Evans & Sutherland Computer Corp.  Simulation Division   SLC, UT 84108
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