Last-Modified: 30 November 1995
See reader questions & answers on this topic! - Help others by sharing your knowledge
This article discusses frequently asked questions (FAQs) about PEX. Each question is grouped as an article in a digest. Some news readers (i.e rn) have commands for skipping to the next article in a digest. In rn, ^G (control-G) skips to the next article in a digest. The information in this article is culled from several sources: - the FAQ in comp.windows.x - articles in the newsgroups comp.windows.x and comp.graphics - articles from the retired newsgroup comp.windows.x.pex - articles from the replacement newsgroup comp.graphics.api.pexlib Where possible, the author, date and article id of the original newsgroup article is included. When I have edited/modified the original article, I have enclosed my modifications in square brackets  with my initials (RT or KS) at the end. Rich Thomson was the previous owner of the FAQ. Karl Schultz is the current owner. Contents: 1) What's new? 2) What is PEX? 3) How can I tell if my X server supports PEX? 4) Why don't the R5 PEX demos work on my mono screen? 5) Where can I get an X-based PEX package? 6) What about immediate mode for PEX? 7) Why don't the R5 PEX contributed demos compile? 8) Why doesn't double-buffering work via phigs_ws_type_create? 9) What does "Kernel not configured with shared-memory IPC" mean? 10) Obtaining Graphics Standards (GKS, PHIGS, etc.) 11) PHIGS/PEX Books 12) Articles on PEX 13) PEX Application Programmer Interfaces (APIs) 14) PHIGS Toolkit -- a portable toolkit for PHIGS programmers 15) Why doesn't HLHSR mode (Z buffering) work with the PEX-SI? 16) printing from PEX 17) Porting from PEX-SI PHIGS to PEXlib 18) Using PHIGS with PEX servers w/o the Workstation Subset 19) OReilly's Program! (BadMatch error in first.c) Acronyms: ANSI American National Standards Institute API Application Programmer Interface CGM Computer Graphics Metafile GKS Graphics Kernel System HLHSR Hidden line and hidden surface removal ISO International Organization for Standardization PEX PHIGS/PHIGS-PLUS Extensions to X (obsolete) PHIGS Progammer's Hierarchical Interactive Graphics System PHIGS-PLUS PHIGS Plus Lumiere Und Surfaces R5 X Window System, Version 11 Release 5 R6 X Window System, Version 11 Release 6 SI Sample Implementation, usually refering to the PEX-SI ------ Subject: 1) What's new? From: Karl Schultz Date: Sat Jul 15 1995 Many articles updated or rewritten to reflect the many changes to PEX since the last (Mar94) revision. 7 Aug 95: - adjusted headers to appease the *.answers approvers. - added FAQ for hardcopy. 29 Nov 95: - added articles 17 and 18. 30 Nov 95: - added article 19. ------ Subject: 2) What is PEX? From: firstname.lastname@example.org (Jay Hersh) Date: Mon Dec 7 14:10:47 MST 1992 Message-Id: <9201201706.AA13024@xenon.lcs.mit.edu> It is a an Extension to the Core X Protocol to provide 3D graphics support within the X Windows environment. [PEX originally stood for PHIGS Extensions to X because it was once intended to be used for implementing PHIGS in the X Windows environment due to the popularity of PHIGS at that time. As time passed, PHIGS support became less interesting, and the goal of supporting PHIGS became secondary to providing support for 3D application programs in general. Today's PEX contains features well beyond those needed to support PHIGS. RT/KS] Included in the X11R5 and X11R6 distributions is code for the Sample Implementation of the extensions to the X Windows server which implements the functionality defined by the PEX Protocol Extensions. In order to access the PEX functional extensions to the X Server one must use an application that generates PEX Protocol. The application can either generate the Protocol bytestream itself, or use something called an Application Protocol Interface or API for short. One such API which is provided with the X11R5 distribution is the PHIGS 3D graphics standard. This is a port of the PHIGS C language binding onto an internal layer which generates the PEX Protocol allowing this particular PHIGS implementation to work within the X windows environment. [This same PHIGS library may be found in the R6 contrib area, since it was withdrawn from the R6 distribution in favor of PEXlib. KS] Other alternate APIs are available via anonymous ftp from ftp.x.org in the contrib areas. R5 Content Patches for a variety of problems in R5 are now available via anonymous ftp on ftp.x.org, and the xstuff mail archive. Fixes are available via anonymous ftp to ftp.x.org, in the directory /pub/R5/fixes/. The files for the new fixes are "fix-18", "fix-19", and "PEXlib.tar.Z". PEXlib.tar.Z is part of fix #19. Note that PEXlib is available only via the patch (fix 19). Instructions for applying the fixes are included in the files. Fixes usually propagate to other distribution sites as well, so it may pay to check at a nearer site first. [Hopefully, if you are using R5, you will be using a completely patched R5. R6 Content R6 contains all the patches for R5, including PEXlib, but no longer contains the PHIGS library. The PHIGS library may be found in the R6 contrib area and can be built in the R6 tree with some difficulty. KS] - Jay Hersh MIT X Consortium ------ Subject: 3) How can I tell if my X server supports PEX? From: email@example.com (Jay Hersh) Date: Mon, 20 Jan 92 12:06:01 -0500 Message-Id: <9201201706.AA13024@xenon.lcs.mit.edu> The xdpyinfo command displays all the extensions supported by a server. If one of the extensions listed is X3D-PEX then your server supports PEX. - Jay Hersh MIT X Consortium ------ Subject: 4) Why don't the R5 PEX demos work on my mono screen? From: firstname.lastname@example.org (X User's Group) Date: Sun, 15 Dec 91 20:51:04 GMT Message-Id: <1991Dec15.email@example.com> Newsgroups: comp.windows.x The R5 sample server implementation only works on color screens, sorry. ------ Subject: 5) Where can I get an X-based PEX package? From: firstname.lastname@example.org (X User's Group) Date: Sun, 15 Dec 91 20:53:23 GMT Message-Id: <1991Dec15.email@example.com> Newsgroups: comp.windows.x The official release of PEX is with X11R5 and X11R6 from the X Consortium. PEX is supplied with various distributions of XFree and Linux. Many vendors supply PEX with their workstations. There is now available from the University of Illinois an implementation of the PEX 4.0 specification called UIPEX. It contains a "near- complete" implementation of PHIGS and PHIGS PLUS. The file pub/uipex/uipex.tar.Z is on a.cs.uiuc.edu (220.127.116.11); the porting platform was an RT running 4.3. Questions and comments can to go firstname.lastname@example.org. [I do not know the status of this package. KS] In addition, the PEXt toolkit by Rich Thomson (email@example.com) is available from the X Consortium contrib areas as PEXt.tar.Z; it includes a PEX widget making it easier to include PEX in Xt-based programs. [Jan Hardenburgh's PEXIM should also be available from the X Consortium contrib areas. KS] ------ Subject: 6) What about immediate mode for PEX? From: jch@Stardent.COM (Jan "Yon" Hardenbergh) Date: 7 May 91 15:39:02 GMT Message-Id: <1991May7.153902.6083@Stardent.COM> References: <JIM.91May6113744@baroque.Stanford.EDU> Newsgroups: comp.graphics PEX has immediate mode intrinsically. No need to add it. What is needed is the API. There are currently three proposed interfaces to PEX Immediate mode: PEXIM, PEXlib and PEXtk. PEXIM is actually a PHIGS subset with immediate mode extensions. PEXlib is to the PEX protocol what Xlib it to the X protocol. PEXtk is trying to capture the best of the proprietary graphics interfaces. Of course, PEXIM has the advantage that graphics hackers familiar with PHIGS can pick it right up, or that can read one of the (great :-) PHIGS books coming out. The ANSI PHIGS committee started to add immediate mode to PHIGS. So, eventually, the API for PEX immediate mode will probably fall back to PHIGS, but that is just opinion. From: jim@baroque.Stanford.EDU (James Helman) > But does this actually address the problem? The main reason that > PHIGS is well-suited for networked graphics is that once your large > mass of geometry is downloaded, you can rapidly change attributes and > transformations without blasting the whole object down the slow wire. > But in immediate mode, one typically sends everything down the wire > each draw cycle. With graphics speeds hitting 1 million polys per > second, you certainly can't blast enough data down an ethernet to feed > the graphics hardware. You have to look at what is happening to the majority of the data. If the geometry is stable but the attribute change, then you can store the geometry in the server and use immediate mode to send the attributes. This is referred to as "mixed mode" or mixing stored structures with immediate mode. This is a very powerful model of graphics. > Hence unless network bandwidth outpaces graphics performance, an > immediate mode PEX API won't be particularly useful over a network. > One could replace the PEX layer with local graphics access to get > performance, thus making the immediate mode PEX API a standard for > non-PEX graphics, but this is a rather convoluted path to such an end. It's never safe to assume that the relative speeds of components of the system will stay the same. You are comparing the high end of rendering with the low end of networking. Compare the current high end of networking, like FDDI at 12 MBytes per second and it works out just fine. 1 M polygons/sec takes 12 MB / second. Of course both of those numbers are PEAK numbers. When you start to look at what applications really do, the peak numbers become irrelevant. > Maybe GL and XGL's days aren't so numbered. Or am I missing > something? Perhaps, local shared memory PEX request queues? The > article didn't even mention bandwidth as a concern. Yes, of course good implementations of PEX will have shared memory. [And today there are "local" implementations that can bypass the protocol completely and control the graphics device directly when the application is running local to the display hardware. KS] But let's talk about the bread and butter cases. The majority of the market has not hit the 30 K triangles per second mark. Ethernet can keep up with that quite easily, and shared memory does more than keep up. But, there is overhead in a network transparent protocol. To get rid of it would require the application to write thier data directly into the shared memory, then there are no copies, still something to work for. People used to say X would never work due to the overhead, or for that matter that fancy UI's do not work due to the overhead. Depends on what you want and where your priorities are. My guess is that the combination of compute servers and PEX terminals and workstations will help PEX become the graphics of choice. If you are not recomputing your 1 million triangles they can be in the display list. If you are recomputing them, how long does that take? on what machine? Disclaimer: I've had something to do with PEX and PEXIM and I always speak on my own behalf, unless specifically stated otherwise. -Jan "YON" Hardenbergh firstname.lastname@example.org (508)-371-9810x261 Stardent Computer, 6 N.E. Tech Center, 521 Virginia Rd,Concord, MA 01742 ------ Subject: 7) Why don't the R5 PEX contributed demos compile? From: email@example.com Date: Thu, 30 Apr 92 15:39:27 -0400 Message-Id: <9204301939.AA06066@exhume.lcs.mit.edu> > [Initially at the time of R5's release...] it was a bit of > work to upgrade PEX to the new ISO IS PHIGS C Binding. The examples > had been put into contrib a while back and there was no time nor > manpower to worry about updating those when other things had to be > fixed and upgraded (like the man pages). The demos have been upgraded. The new versions for the ISO PHIGS C binding are available from export.lcs.mit.edu in the file PEX.examples.tar.Z in the directory contrib/R5fixes. - Jay Hersh ----- Subject: 8) Why doesn't double-buffering work via phigs_ws_type_create? From: firstname.lastname@example.org (Rich Thomson) Date: Sat, 23 Nov 91 20:38:52 GMT Message-ID: <1991Nov23.email@example.com> References: <1991Nov22.firstname.lastname@example.org> Newsgroups: comp.graphics,comp.windows.x In article <1991Nov22.email@example.com> senften@taurus (Scott D. Senften) writes: > >I need your help...I just got X11R5 up and running on my Sparc and I'm wanting >to do some PHIGS+ work. I've got a rough prototype up and running but I can't >seem to get the double buffering working. I tried: > > wks = phigs_ws_type_create(phigs_ws_type_x_tool, > PHIGS_X_BUF_MODE, PHIGS_BUF_DOUBLE, > 0); > >but that alone doesn't seem to do it. Am I missing something? What you're missing is that the PEX-SI provides no support for double buffering. A serious hole in the PEX-SI is its non-support for double buffering. Even worse, the PEX-SI api assumes that the client desires an XClearArea on the window before each frame is drawn. What really should have been done was to provide an end-of-render procedure hook, with the default hook installed to do a clear area. Individual vendors (because of market pressure) have provided their own solutions to the double buffering problem (we do double buffering an all PHIGS workstations; if you do immediate-mode you get single buffering along with the PEX-SI's XClearArea call). I believe the PEX interoperability group is currently working on a vendor neutral solution that we can all agree on. -- Rich ----- Subject: 9) What does "Kernel not configured with shared-memory IPC" mean? From: michaelh@homebrew.WV.TEK.COM (Mike Herbert) Date: 25 Nov 91 18:54:35 GMT Message-ID: <firstname.lastname@example.org> Newsgroups: comp.windows.x Francis J. Hitchens writes: > I have just built X11R5 on my VAXstatsion 3100, under ULTRIX 4.1, and > tried to run the PEX > tests. > > They all failed... > > PHIGS error -57 in OPEN PHIGS: Kernel not configured with shared-memory IPC > facility needed for PEX SI communication I ran into this problem last week. Here's what I've determined so far. Your PEX library has been built so that it is trying to use the shared-memory IPC facility to communicate with the phigsmon program. If your client does not need phigsmon, then turn it off: setenv PEX_SI_API_NO_PM 1 (Typically you should only need phigsmon for doing PHIGS input or client- side structure storage.) Another alternative is to rebuild the PEX library so that it uses sockets to communicate with phigsmon. You can do this by defining "PEX_API_SOCKET_IPC". (I haven't tried this, but the code indicates that it should work.) The other alternative, of course, it to configure your kernel to use IPC. (I'm a novice as far as Ultrix is concerned, so I really don't understand what's involved in doing that.) Mike Herbert Tektronix, Inc. Network Displays Division P.O. Box 1000, M/S 60-850 Wilsonville, OR 97070 (503) 685-2145 michaelh@orca.WV.TEK.COM ----- Subject: 10) Obtaining Graphics Standards (GKS, PHIGS, etc.) From: jch@Stardent.COM (Jan "Yon" Hardenbergh) Date: 12 Feb 91 19:27:53 GMT Message-ID: <1991Feb12.192753.3647@Stardent.COM> Newsgroups: comp.graphics GKS - Graphical Kernal System - geometric graphics system CGM - Computer Graphics Metafile - archive of graphics commands - very useful for plotting. PHIGS - the best graphics standard! 3D geometric graphics with lighting and shading and neat primitives to draw fancy pictures. If you are looking for a broad overview of graphics standards you might try this: > Guidelines for determining when to use GKS and when to use PHIGS > Bettels, J.; Bono, P.R.; McGinnis, E.; Rix, J. > Author Affil: Digital Equipment Corp., Geneva, Switzerland > Source: Comput. Graph. Forum (Netherlands) vol.7, no.4, pp.: 347-54 > Publication Year: Dec. 1988 > (29 Refs) > Abstract: GKS, GKS-3D, and PHIGS are all approved ISO standards for the > application programmer interface. How do system analysts or programmers > decide which standard to use for their application? The authors discuss the > range of application requirements likely to be encountered, explore the > suitability of GKS and PHIGS for satisfying these requirements, and offer > guidelines to aid in the decision process. I know I've seen other overviews of graphics standards. Just none recently. There are a couple of books on CGM and GKS, but I do not have the references written down. As, for PHIGS, you can get the standard itself from ANSI in New York. 212-642-4900, 11 West 42nd Street, NY, NY 10036. [The following table gives the ANSI standard numbers corresponding to the PHIGS standards: ANSI X3.144-1988 ISO 9592 parts 1, 2 and 3 for PHIGS ANSI X3.144.1 ISO 9593-1 for PHIGS FORTAN binding ANSI X3.144.3 ISO 9593-3 for PHIGS Ada binding ANSI X3.144.4 ISO 9593-4 for PHIGS C binding --RT] They will also have the GKS and CGM specs. -Jan "YON" Hardenbergh email@example.com (508)-371-9810x261 Stardent Computer, 6 N.E. Tech Center, 521 Virginia Rd,Concord, MA 01742 ----- Subject: 11) PHIGS/PEX books From: firstname.lastname@example.org (Jan Hardenbergh ) Date: Fri, 3 Sep 1993 00:31:21 GMT Summary: lots of PHIGS and PEX books out there. Id: <CCr5G9.28q@cvbnet.CV.COM> I'm perhaps not the best judge, since I have them all (or will soon) and have a trial membership to the authors club, where we all chum around together :-) But if your job is actually to work with either PHIGS or PEX, SPEND the $200+ or so to get many of the books here. It's a tiny investment in your career, especially if you get reimbursed! If you are the type that only wants one book on a subject, go to a bookstore and look carefully at which one you want, after all, you can't judge a book by its email. The books I'd buy again appear in order of appearance. PHIGS Books =========== Toby Howard et al. "A Practical Introduction to PHIGS and PHIGS PLUS" Addison-Wesley 1991, ISBN 0-201-41641-7 A "great" small book on PHIGS. Covers almost everything, but briefly. Not good to program from, but if your question is what is PHIGS, this will be the best place to start for most people. Tom Gaskins. "PHIGS Programming Manual", O'Reilly 1992, ISBN 0-937175-92-7 (casebound) ISBN 0-937175-85-4 (soft) This is the most comprehensive and the best to program from for Sun and any PEX-SI based PHIGS product. Tom knows this stuff inside and out. Joseph E Kasper and David Arns."Graphics Programming with PHIGS and PHIGS-PLUS" HP Press/Addison Wesley, ISBN 0-201-56343-6 A book more oriented to the standard than Gaskins' book, It has both FORTRAN and "C" and uses new binding. Especially good for HP. John W. Blake. "PHIGS + PHIGS+, An Introduction to 3D Computer Graphics" Acedemic Press/Harcourt Brace Jovanovich Ltd. ISBN 0.12.103515.8 (only from 24-28 Oval Road, London, NWI 7DX, UK // Lbs 29.95 ??) I'm buying it, sight unseen... "PHIGS Reference Manual", O'Reilly 1992, Edited by Rich Ellis & ... ISBN 0-937175-91-9 Man Pages (improved version of the PEX-SI man pages) Hopgood & Duce, "A Primer for PHIGS" John Wiley & Sons Ltd, ISBN: 471 93042 3 (no PHIGS-PLUS) Some useful notions on structure editing. W.A. Gaman, W.A. Giovinazzo, "PHIGS by Example", Springer-Verlag, ISBN 0-387-97555-1 PEX Books ========= Tom Gaskins' "PEXlib Programming Manual", O'Reilly 1992, ISBN 0-56592-028-7 This is a great book. Paula Womack, PEXlib: A Tutorial, Prentice Hall 1993 (printing, due October) ISBN 013-015843-7. Sight unseen. Paula was document editor for PEX 5.1, I'd bet it's great. Mark Graff, PEXlib: A Reference Manual, Prentice Hall, ISBN 013-176066-1, Sight unseen. "PEXlib Reference Manual", O'Reilly 1992, ISBN 1-56592-029-5 Man pages for PEXlib SI, with intro by Tom Gaskins. ...and one more... Jan Hardenbergh, Building Applications with PEXlib, Prentice Hall, (December) ISBN 013-012535-0. I've seen too much of this to be impartial! I like it. My conscience is clean (still) about using the internet for commercial gain. I've been sending out these lists of PHIGS books since before I had even thought of writing one. But at this point I'll stop because I think it is a gray area. I hope someone else will take it up. Joe? Opinions expressed are my own, my employer uses HOOPS! Jan "YON" Hardenbergh - email@example.com - 617-275-1800x3275 Computervision Corp. MS 5-2, 14 Crosby Drive, Bedford, MA 01730 "Imagination is more important than knowledge" A. Einstein - Thank God! ----- Subject: 12) Articles on PEX From: firstname.lastname@example.org (Ken Lee) Date: 12 Aug 91 17:06:05 GMT References: <1991Aug12.email@example.com> Clifford, William, John McConnell, and Jeffrey Friedberg, "The Development of PEX, A Three-dimensional Graphics Extension to X11," in Proceedings of Eurographics'88, September, 1988. An overview PEX, an extension to the X protocol to support PHIGS+. Rost, Randi, Jeffrey Friedberg, and Peter Nishimoto, "PEX: A Network- Transparent 3D Graphics System," IEEE Computer Graphics & Applica- tions, pp. 14-26, July, 1989. A good overview of PEX, the PHIGS/PHIGS+ 3D extension to X. A complete PEX is currently being developed by Sun under contract to the MIT X Consortium and is scheduled to be publicly available in 1991. Stroyan, Michael, "Three-Dimensional Graphics Using the X Window System," Dr. Dobb's Journal, vol. 15, no. 2, pp. 28-36, February, 1990. A high level description of various approaches to developing 3D graphics tools for X, including those of the PHIGS Extension to X (PEX) and HP's Starbase-on-X11 (sox11). Sung, Hsien Ching Kelvin, Greg Rogers, and William Kubitz, "A Critical Evaluation of PEX," IEEE Computer Graphics & Applications, vol. 10, no. 6, pp. 65-75, November, 1990. An evaluation of PEX, the X exten- sion to support PHIGS, from the point of view of a PHIGS implementor. Thomas, Spencer W. and Martin Friedmann, "PEX - A 3-D Extension to X Win- dows," in Proceedings of the Winter, 1989 USENIX Conference, pp. 139- 149. Describes a demonstration implementation of PEX, the PHIGS/PHIGS+ 3D extension to X. A complete PEX is currently being developed by Sun under contract to the MIT X Consortium and is scheduled to be publically available in 1991. ----- Subject: 13) PEX Application Programmer Interfaces (APIs) From: firstname.lastname@example.org (Rich Thomson) Date: Tue Mar 2 22:27:37 MST 1993 When discussing PEX, it is important not to confuse the protocol with the API, or application programmer interface. The API is the conceptual model of 3D graphics that the application developer sees. The protocol is generated by the API and is interpreted by the server to perform graphics requests on behalf of the client program. One API provided with the R5 PEX-SI is a PHIGS/PHIGS-PLUS API. The PHIGS/PHIGS-PLUS standards are specified in two parts. First, a functional description describes each operation conceptually, in a language-independent manner. Second, language bindings are used to bind the particular PHIGS functions to the semantics of the language. The PEX-SI comes with an application programmer interface that conforms with the latest revision of the PHIGS/PHIGS-PLUS C language binding. Bob Schulte of SHOGraphics had this to say about their GL-like API called PEXtk: Newsgroups: comp.windows.x.pex From: email@example.com (Bob Schulte) Subject: Re: difference between PEX and GL Date: Fri, 5 Feb 1993 16:03:42 GMT PEXtk is complete and available now directly from export.mit.lcs.edu, and is located in /contrib. The files are pextk.PS.tar.Z, pextk.README, and pextk.tar.Z. It is Free. Depending on how you write a GL program and what features you use it may or may not be difficult to port to PEXtk. It would certainly be easier than porting to PHIGS. For example PEXtk uses X as its windowing system, so the UI is X based. We have not attempted to duplicate any GL windowing functions. Bob -- Bob Schulte, E-Mail: firstname.lastname@example.org Voice: (408) 524-4015 SHOgraphics. Performance Through PEX If your version of R5 is patched through patch #22, you have a second MIT supplied API called "PEXlib". PEXlib is to the PEX protocol what Xlib is to the core X protocol. PEXlib provides an interface that is as close as possible to a one-to-one correspondence between functions and protocol requests. It is intended to be a systems programming interface (i.e. people developing graphics toolkits and graphics systems will implement their system on top of PEXlib). It is proposed that the PHIGS API be ported to PEXlib once PEXlib is finalized. This change would not affect programs written to the existing PHIGS API. However, since PEXlib is intimately tied to the protocol, it is expected that there will be changes between the current PEXlib (which supports version 5.0 and 5.1 of the PEX protocol) and the PEXlib that supports the next major version of the PEX protocol, version 6.0. Naturally, every attempt will be made to make the changes to the API minimal. The nature of the changes from 5.1 to 6.0 are not such that every primitive will be affected; rather the changes deal with the sticky problems of subsets, multi-buffering, and other issues of global rendering semantics. [PEX 6.0 was dropped and a backwards compatible PEX 5.2 was created instead. KS] The future may contain other popular graphics APIs (SGI's GL, HP's Starbase, Stardent's Dore') that also generate the PEX protocol. -- Rich ----- Subject: 14) PHIGS Toolkit -- a portable toolkit for PHIGS programmers From: Gareth Williams <email@example.com> Date: Mon, 8 Feb 93 08:56:20 GMT Message-Id: <9302080856.AA04031@r3i.cs.man.ac.uk> THE PHIGS TOOLKIT A PORTABLE TOOLKIT FOR PHIGS APPLICATION PROGRAMMERS ************************************* **** NEW RELEASE VERSION 3.2 FOR **** **** SunPHIGS 2.0 **** **** HP PHIGS 2.2 **** **** ## IBM graPHIGS 1.02 ## **** **** PEX-SI **** ************************************* We are pleased to announce the availability of version 3.2 of the PHIGS Toolkit, a portable toolkit for PHIGS application Programmers. The PHIGS Toolkit has been developed at the University of Manchester, UK, and is funded by the Science and Engineering Research Council (SERC) and the Advisory Group on Computer Graphics (AGOCG). The Toolkit is based on the experience of the developers who have been active PHIGS programmers for several years and were also involved in the ISO technical review of PHIGS and PHIGS PLUS. Following the release in September this year of version 3.1 of the PHIGS Toolkit, version 3.2 is now available which supports SunPHIGS 2.0, HP PHIGS 2.2, IBM graPHIGS 1.02 and MIT's PEX-SI. MAIN FEATURES OF THE TOOLKIT ---------------------------- o comprehensive transformations library o automatic drawing of structure network hierarchy diagrams o automatic drawing of structure content diagrams o interactive CSS debugger o interactive view editor o window system implemented using PHIGS structures o interactive PHIGS Interpreter o comprehensive colour model support library o menu system to extend PHIGS input o Runs with C and FORTRAN for SunPHIGS on SunOS o Runs with C for HP PHIGS on HP-UX o Runs with C for graPHIGS on AIX o Runs with C for PEX-SI on SunOS o Runs with C and FORTRAN for DEC PHIGS on VAX/VMS (PTK 2.0 only) o full source code provided o demonstration programs provided o comprehensive documentation WHAT IS THE PHIGS TOOLKIT? -------------------------- The purpose of the PHIGS Toolkit is to help application programmers to program more effectively and securely using PHIGS. The functionality provided by PHIGS is low-level, and the PHIGS Toolkit provides a number of tools of various levels of complexity in order to make programming with PHIGS quicker, and less painful. To the programmer, it is as if the functions provided by PHIGS have been supplemented with a set of additional functions, and a typical application will use both `raw' PHIGS functions as well as PHIGS Toolkit functions. A convenient way to view the Toolkit is as a layer of software which sits `on top of' PHIGS. Tools in the PHIGS Toolkit are divided into two categories: PROGRAMMING TOOLS, and HIGH-LEVEL TOOLS. Programming tools are generally quite simple single-purpose procedures, and are designed to help applications programmers to construct PHIGS programs more quickly and reliably. The high-level tools are more powerful, and provide programmers with means for visualising and debugging structure networks. PROGRAMMING TOOLS ----------------- o the Transformations Library -- functions for constructing and manipulating coordinate transformations. o the HashStrings Library -- functions which enable text strings to be used in situations where integers would normally be required. o the PHIGS Utilities Library -- utility functions, providing operations (such as `copy element') which are not directly provided by PHIGS, as well as common sequences of PHIGS function calls `bundled up' into single functions. o the PHIGS Traversal State List Library -- functions for controlling and inquiring a simulated structure network traversal. o the Colour Library -- functions for defining colour values using English words and phrases, and for interchangeably manipulating colours using various colour models. o the PHIGS Textual Interpreter (Phinter) -- a tool for reading textual PHIGS scripts. Phinter may be used interactively with a PHIGS string device or standard input. HIGH-LEVEL TOOLS ---------------- o the PHIGS Structure Content Drawer -- a tool to generate diagrams showing which elements structures contain. The diagrams are themselves PHIGS structures, with a documented format. o the PHIGS Topology Library -- functions for automatically generating diagrams representing the topology of PHIGS structure networks. The diagrams are themselves PHIGS structures, with a documented format. o the PHIGS Menus Library -- functions for constructing and manipulating menus built using PHIGS structures. o the PHIGS Windows Library -- functions for displaying and viewing PHIGS structure networks in windows. o the PHIGS Debugger -- a tool (modelled after conventional programming language debuggers) for simulating the traversal of structure networks. The traversal may be stepped through incrementally and the state of the traversal inquired at any stage. o the PHIGS View Editor -- a utility for interactively editing and experimenting with viewing parameters for a scene. PHIGS TOOLKIT INFORMATION ** REGISTER NOW ** ---------------------------------------------- We would like to encourage all people interested in the PHIGS Toolkit to register as PHIGS Toolkit users. This will ensure that all PHIGS Toolkit users will receive notice of new versions, course dates, bug reports and any other useful information. Please send the following information to firstname.lastname@example.org. Name: Organisation: email: Telephone/FAX: PHIGS implementations used: Even if the PHIGS Toolkit is not currently available for your particular PHIGS implementation, please register. We are currently working on ports to several other PHIGS implementations and it would be very useful to know what the demand is for different versions. HOW TO OBTAIN THE PHIGS TOOLKIT ------------------------------- The PHIGS Toolkit is available from two sites in the UK: PTK from Kent ------------- The PHIGS Toolkit is available from HENSA (Higher Education National Software Archive) at the University of Kent. The HENSA Service at the University of Kent can be accessed in a number of ways: Interactive ----------- There is a friendly interactive interface which has a useful find utility for locating software. Connect to unix.hensa.ac.uk and log in as "archive" for an interactive interface to the HENSA archive. Connections can be made using telnet (unix.hensa.ac.uk) and X.29 across JANET (uk.ac.hensa.unix, DTE 000049200900). anonymous ftp ------------- Using DARPA FTP connect to the machine unix.hensa.ac.uk and login as "anonymous", giving your email address as the password. guest NI-FTP] Using Blue Book NI-FTP with the following: address: uk.ac.hensa.unix login: guest path: <ARCHIVE>/filename eg. % fcp -b "<ARCHIVE>/uunet/ls-lR.Z"@uk.ac.hensa.unix ls-lR.Z User name on uk.ac.hensa.unix? guest Password on uk.ac.hensa.unix? email@example.com email server ------------ Send a message to "firstname.lastname@example.org" containing the string "help" for details on how to use it. Any general queries regarding the HENSA service at The University of Kent should be directed to email@example.com, queries specific to the Netlib service should be sent to firstname.lastname@example.org and stuff concerning the source archive to email@example.com. The relevant files for the PHIGS Toolkit on HENSA are: PTK 3.2 /misc/unix/phigstk/PhigsToolkit3.2.tar.Z for SunPHIGS 2.0 on SunOS, HP PHIGS 2.2 on HP-UX, graPHIGS 1.02 on AIX, PEX-SI on SunOS. PTK 2.0 /misc/unix/phigstk/PhigsToolkit.tar.Z for SunPHIGS 1.x on SunOS. /misc/vms/phigstk/ptk.hex for DEC PHIGS 2.3A on VAX/VMS. PTK from Manchester ------------------- By anonymous ftp from uk.ac.mcc.hpb. (18.104.22.168) Username "anonymous", and your network address as password. The files are: PTK 3.2 pub/cgu/ptk/ptk3.2.tar.Z for SunPHIGS 2.0 on SunOS, HP PHIGS 2.2 on HP-UX, graPHIGS 1.02 on AIX, PEX-SI on SunOS. PTK 2.0 pub/cgu/ptk/ptk.tar.Z for SunPHIGS 1.x on SunOS. pub/cgu/ptk/ptk.shar* for DEC PHIGS 2.3A on VMS. ( For VMS the Toolkit is stored as a collection of SHAR files. There are 288 files in total, each 15K in size. They are called ptk.shar_X where X is 1 ... 288. To rebuild the Toolkit directory structure the files must be concatenated together and run as a command file. $ copy ptk.shar_%, ptk.shar_%%, ptk.shar_%%% ptk.shar $ @ptk.shar ) PTK by Magnetic Tape -------------------- Send a 1/4 inch cartridge for SunOS, and a 1/2 inch open reel magnetic tape for VMS to: Tim Hopkins Computing Laboratory University of Kent email: firstname.lastname@example.org or Toby Howard Department of Computer Science University of Manchester Oxford Road Manchester M13 9PL United Kingom Tel: +44 61 275 6274 Fax: +44 61 275 6236 email: email@example.com PHIGS TOOLKIT TRAINING COURSE ----------------------------- A training course for users of the PHIGS Toolkit was held at the University of Manchester on September 23rd 1992. Course materials including four programming exercises and three step-through tutorials are provided in this release of the Toolkit. FUTURE WORK ----------- The first phase of the PHIGS Toolkit does not include support for PHIGS PLUS. Work is now underway to expand the Toolkit to include extensive support for PHIGS PLUS functions, and the expanded PHIGS Toolkit will be released in April 1993. A toolkit providing support for NURBS curves and surfaces has also been developed at Manchester, and is designed to be complementary to the PHIGS Toolkit. It is available from the same sites as PTK. BETA TEST --------- We are currently looking for beta testers for the PHIGS PLUS extensions and the test will start in the new year and finish at the end of February 1993. A short report will be required from testers. Please get in touch if you are interested in being a tester. Toby Howard, Terry Hewitt, Gareth Williams, Steve Larkin, David Yip University of Manchester Oxford Road, Manchester, M13 9PL, United Kingdom ----- Subject: 15) Why doesn't HLHSR mode (Z buffering) work with the PEX-SI? From: Rich Thomson <firstname.lastname@example.org> Date: Mon Mar 28 14:14:49 MST 1994 Sorry, the PEX-SI doesn't have any support for hidden line and hidden surface removal (HLHSR), commonly implemented through Z buffering. The PEX-SI team decided that since Z buffering is very device specific they would leave it up to each vendor to implement Z buffering support for the first release. [The PEX-SI (server code) decomposes PEX primitives down to X-level primitives and draws them via the DDX interface. This allows the PEX-SI code to work with virtually any X server implementation. The downside is that certain non-X features like Z buffer operations and color interpolation of spans is not available. KS] It is planned to provide software Z buffer HLHSR support in the PEX-SI, probably in the R6 release. [There is a patch on contrib that does this. KS] The PHIGS standard allows an implementation to provide only HLHSR mode NONE and still be a conformant implementation of the standard. This is probably a leftover from the days of calligraphic and storage-scope type displays which don't have Z buffers or other HLHSR removal methods in hardware (except hardware-based sorting for hidden-line removal). -- Rich ----- Subject: 16) printing from PEX From: email@example.com (Karl Schultz) Date: 4 Aug 1995 14:44:28 GMT In article <firstname.lastname@example.org>, gero@PROBLEM_WITH_INEWS_DOMAIN_FILE (Gero Dargel) writes: > Hi, > can anybody tell me how to print (in better quality than > screen-dump) from PEX-PHIGS (PEX-SI). > I'm looking for a mechanism like the CGM-workstation in > S?N-PHIGS. In a word, no. There may be a chance that some vendor has added this as a feature to their product. Additional info: The PHIGS SI doesn't support any sort of hardcopy workstation type. As noted above, some vendors may have PHIGS-related products that do this. The PHIGS SI does have some support of "workstation types" in the area of whether or not PHIGS will create the window for you, or will accept an existing window to draw into as is convenient with toolkit applications. This particular control is all implemented in the PHIGS client-side library, so no real PEX protocol support is required. However, for additional workstation type requirements like hardcopy support where you want the work done in the server someplace, PEX would need some sort of extension or augmentation to allow the client to specify what workstation type to use when creating a workstation. In the PEX Workstation Subset, this might be some sort of list of supported workstation types to select from, and in the Renderer Subset of PEX, this concept might be introduced via "renderer classes" that can be specified when creating a renderer. This might, for example, allow selection of a ray-tracer to draw a scene, instead of the usual polygonal renderer. In any case, the PEX protocol today probably cannot support hardcopy workstation/renderer types and the SI certainly does not implement anything like it. Karl Schultz ----- Subject: 17) Porting from PEX-SI PHIGS to PEXlib From: Karl Schultz <email@example.com> Here is an account (provided by David Friend) of the experience of porting a PEX-SI PHIGS application to PEXlib. As always, your mileage may vary, but you can get some ideas of what is involved from these notes. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ I started by doing the following: - Stuff involved in making the decision. - Bought a copy of "PEXlib Programming Manual" by Tom Gaskins. - Printed out a copy of "PEXlib Specification and C Language Binding" by Jeff Stevenson. (This is a postscript file that comes with X11R6. It is for PEX version 5.1. It was written November 5, 1992. I did not buy the PEXlib reference manual because every store in town that normally stocked it was out.) At this point I went through the source code in my program and, using my PHIGS and PEXlib manuals, replaced each structure type and function call with the equivalent in PEXlib. (I commented out the three routines that handle picking, exposures, and the X-Windows to world coordinates conversion. I did not need these routines immed- iately.) After fixing errors and warnings generated by the compiler, and one bug (to be mentioned shortly), I had a working program, barring the missing sections. In all, it took 30 hours to port the 550 Kbytes of source code. The picking and exposures took another 7.5 hours. The XC to WC conversion routine took 7.5 hours; this is the one point in the entire port that I had to write new code, rather than do a straight forward conversion. The one serious bug I had was this. Many of the routines require that you pass a pointer to the display. You must pass the one returned by XOpenDisplay(). If you pass one returned by XtDisplay() you will get an unexplained core dump. Furthermore, some X and Xt routines that worked fine before with the value returned by XtDisplay() will now behave incorrectly. Use the value from XOpenDisplay() instead. (KWS: This is probably some sort of bug; I've written many PEXlib programs that obtain the Display variable from XtDisplay().) Completing the port, updating documentation, porting a second program of similar size, creating installation disks, installing the code in client sites, etc. will probably result in the port taking a total of 150 hours. (KWS: Port was done on Sun equipment - here are some notes:) - You may use shared library /usr/openwin/lib/libPEX5.so.2 that comes with Solaris. However, you must provide your own include files. They may be found in /usr/X11R6/include/X11/PEX5/PEX*.h, or in xc/lib/PEX5/PEX*.h in the uncompiled source distribution for X11R6. Almost identical include files are provided with X11R5 after you have applied the 22 patches. - If you also use Motif, you may use the shared libraries and include files found under /usr/dt. Do not use the ones that come with the Software Development Kit. Programs that are compiled and linked with the SDK versions will not run unless the target computer also has the Motif shared libraries that come with the SDK. - Always use the Display pointer returned by XOpenDisplay() for all PEX, Xt and X routines. Don't use the one returned by XtDisplay(). (Actually, I had two non-PEXlib routines that insisted on the one returned by XtDisplay(), and would not work with the one returned by XOpenDisplay().) - Your LD_LIBRARY_PATH environment variable must point to the correct shared library directories. Unlike Solaris v1.1.x, the programs do not appear to know where to look for their shared libraries. Use command "ldd" to see what shared libraries your program is looking for. - My program exercised PHIGS pretty thoroughly. However, it did not use most of the new features available in PHIGS PLUS. It did complicated viewport, etc. transformations. It did picking, handled exposures, grabbed the images from the server after they were drawn, etc. It used a fake RGB standard colormap, in which it wrote what every colours it wanted. This kludge ported without special effort. All of this translated easily into PEXlib, barring the X-Windows to World coordinates transformation. - Find below the notes I made while porting that relate directly to the PEX-SI to PHIGS conversion. They are edited to remove some of the notes specific to my program. PEX-SI to PEXlib Porting Notes Done (in general): - In Imakefile replace "-lphigs" with "-lPEX5". - In Imakefile, for Solaris, add -I../R6_PEX5. - Replace "<phigs/phigs.h>" with "<X11/PEX5/PEXlib.h>". - Replace ppost_struct() and pupd_ws() with PEXRenderNetwork(). - Replace pescape() request to wait for PHIGS update with XSync(). - PEX cannot handle the value returned by XtDisplay(). It must use the one returned by XOpenDisplay(). Some X and Xt routines have the same problem. Modify code accordingly. - Redid main.c:xc_to_wc(). - Redid main.c:RedrawPHIGS(). Done (to initialize system and renderers, etc): - In main() replace initializing PHIGS with initialzing PEXlib. - In main() don't tell PHIGS to ignore DC limits. - Put "PEXRenderer renderer" in TargetType. Initialize to None in main(). - In create_workstation(): - Remove test to see if workstation is open. Use "Target->renderer != None" in place of "workstation_open". - Remove closing of PHIGS workstation. - Replace section opening PHIGS workstation with the equivalent for opening a PEX renderer. - Add global values RendererDefaults and RendererDefaultMask. - Replace pclose_ws() with PEXFreeRenderer(). - Deleted pclose_phigs(). Done (to update colour tables): - Replace "Pcolr_rep" with "PEXColorSpecifier". - Use the new member values in Target->ColourMap for read_file() and scale_image(); ColourMap in read_tiff_image(), write_tiff_image() and colour_to_bw(); rgb in create_workstation(); and colr in set_palette(). - In create_workstation() call PEXSetTableEntries() in place of pset_colr_rep(). - In main() create colour table and colour approximation table. Initialize the colour approximation table. - Move initializing colour table from create_workstation() to main(). Done (to update generating structures); - In main(), when calling PEXInitialize, make sure that the server supports structures. - Replace pempty_struct() with PEXDeleteElements(). - Remove all calls to popen_struct() and pclose_struct(). - In main() create the PEX structures. - In main(), at end, don't call punpost_all_structs(), do delete all PEX structures. - Replace pexec_struct() with PEXExecuteStructure(). - Replace pset_line_colr_ind() with PEXSetLineColorIndex(). - Replace "Ppoint3" with "PEXCoord". (The members are the same.) - Got rid of "Ppoint_list3". - Replace ppolyline3() with PEXPolyline(). - Replace pset_int_colr_ind() with PEXSetSurfaceColor(). - Replace pfill_area_set3() with PEXFillArea(). - Delete calls to pinq_edit_mode(), pset_edit_mode(), pset_edge_flag() and pset_linetype(). They were all setting values to the defaults. - Replace pset_int_style() with PEXSetInteriorStyle(). - Replace pset_linewidth() with PEXSetLineWidth(). - Replace pset_text_colr_ind() with PEXSetTextColor(). - Replace pset_char_ht() with PEXSetCharHeight(). - Replace ptext3() with PEXText(). - Replace pset_text_align() with PEXSetTextAlignment(). Done (to update picking): - Replace padd_names_set() with PEXAddToNameSet(). - Replace premove_names_set() with PEXRemoveFromNameSet(). - In main() add and initialize a pick filter for the renderer defaults. - In main(), at end, free the pick filter name set resources. - Change "Ppick_path_elem" to "PEXPickElementRef". Change members struct_id, pick_id and elem_pcs to sid, pick_id and offset. - Change "Ppick_path" to "PEXPickPath". Change members depth and path_list to count and elements. - Replace pescape() request to do picking with PEXPickOne(). - Replace pinq_elem_type_size() and pinq_elem_content() with PEXFetchElements() and PEXDecodeOCs(). Done (to update views): - Create a separate view table for each PEX renderer. - Replace pset_view_ind() with PEXSetViewIndex(). - Replace pset_view_rep3() with PEXSetTableEntries(). - Replace pset_ws_vp3() and pset_ws_win3() with PEXChangeRenderer() with mask = PEXRAViewport | PEXRANPCSubVolume. - Replacae peval_view_ori_matrix3() with PEXViewOrientationMatrix(). - Replace Pview_rep3 with PEXViewEntry. (The members have changed.) - Replace peval_view_map_matrix3() with PEXViewMappingMatrix(). Done (to update modelling transformations): - Replace "Pmatrix3" with "PEXMatrix". - Replace "Pvec3" with "PEXVector". Change members from delta_x, delta_y and delta_z to x, y and z. - Replace ptranslate3() with PEXTranslate(). - Replace pscale3() with PEXScale(). - Replace protate_x() and protate_y() with PEXRotate(). - Repalce pcompose_matrix3() with PEXMatrixMult(). - Replace pset_local_tran3() with PEXSetLocalTransform(). - Replace ptran_point3() with PEXTransformPoints(). ----- Subject: 18) Using PHIGS with PEX servers w/o the Workstation Subset From: Karl Schultz <firstname.lastname@example.org> Some PEX vendors (HP, and now Sun) do not support the PHIGS Workstation Subset in their PEX servers. Is it still possible to use the PEX-SI PHIGS API with these servers? The answer is YES, if you set the right environment variable. The environment variable is PEX_SI_API_CLIENT_SS. If you set it to a non-zero value, the PHIGS API will not use the PHIGS workstation subset in the PEX server and send the data in immediate mode to the server. Note that this has obvious performance implications if you are running your application over a network, but if running locally, the difference may not be noticable. ----- Subject: 19) OReilly's Program! (BadMatch error in first.c) From: email@example.com (Karl Schultz) Date: 1 Dec 1995 01:42:57 GMT Organization: Hewlett-Packard Fort Collins Site Lines: 59 Message-ID: <firstname.lastname@example.org> References: <email@example.com> NNTP-Posting-Host: manfred.fc.hp.com In article <firstname.lastname@example.org>, email@example.com (Narayanan Ramabadran (R)) writes: > > Hi Everyone! > I know i have been bugging some of you these past few days as to try and > figure out why my "first.c" was not working on the sun solaris. > I have figured out what the problem is....... Maybe I'll add this to the FAQ. > Here goes: > the rest of the programs use the functions given is "book_utils.c" where > there is no bug... On the other hand, in the "first.c" the function call > to XCreateWindow misses one of the parameters (in the calling function!). > To be specific, the "CWBorderPixel" is missing... I added this and BINGO! > it works fine..... i am feeling sick that i have been scratching my heaD > over this for the last week or so!!! If anyone wants to understand WHY, please read: In the failing environment, Sun, in this case, the example program was apparently trying to create a window that was of different (deeper) depth than the parent. This is fairly common on servers that support both 8 and say, 24 bit deep visuals. The root window is usually 8 bit and X clients can create 24-bit deep windows if they want. When a client creates a window, the window usually inherits all its attributes from the parent, unless they are overridden by parameters and supplied window attrubutes. In this case, the 24-bit window tried to inherit the 8-bit parent's BorderPixel attribute. A pixel for an 8-bit drawable cannot be logically converted for use in a 24-bit drawable, so this attribute MUST be supplied/overriden when creating a window of different depth than its parent. This is a very common error that traps a lot of people. > But with the same error, it works from the IBM RS/6000... Probably because the IBM machine didn't support visuals of more than one depth. > Karl: thanks for the mail you sent me.. i was trying to figure out what > the border and background pixel values were (as per your advice) and that's > when i noticed this!!!!! I sent that to you because that is what I thought was causing the problem! :-) > the book (pexlib prog. manual) also has the error... (i think its an error, > but if it's not, please correct me).. Yeah, technically it probably is an error. The book_utils are probably more robust than the same type of code in first.c. The first.c program was trying to get folks started without a lot of other distractions. It is also possible that the bug was discovered and fixed by somebody who didn't realize that first.c did not include book_utils, so they assumed that fixing book_utils would fix the entire set, which was *almost* a correct assumption. Note that the problem is not strictly related to PEX. You can get in the same hole with an Xlib application.