Showing posts from January, 2023

Tonight's game on OpenPOWER: Shadow Warrior

Well, it's been awhile since we expanded our games library, so let's go back to our regular fast food diet of FPSes and select one from the Build side of the house this time: Shadow Warrior. Build games have a reputation starting with Duke Nukem 3D (a game for another day) and that reputation is well-deserved, so let's get this out of the way: if you found these games iffy in the 1990s, rest assured they've aged badly, because you'll find the content level positively radioactive now between the adult humor, graphic violence and (this game in particular) incredibly inappropriate cultural stereotypes. Stop reading this article now and look at some of our other game builds.

On the other hand, Shadow Warrior was probably the most technically superior of the Build games (with the possible exception of Monolith's Blood): more sophisticated sector effects, coloured lighting, true transparency (including water, though used sparingly to avoid spoilers and performance issues), fog and clouds, larger levels, room-over-room effects and the part I liked the most (and was curiously missing from the classic Mac OS port by MacPlay-Westlake Interactive), voxel-based objects that were truly 3D. All of these features plus OpenGL have made it to JonoF's Shadow Warrior Port (JFSW), using Ken Silverman's Build and Polymost engines (more info).

JFSW builds pretty much out of the box with SDL 2; just type make (or make -j24 or such to exercise your other cores), then copy the .GRP group file from either the 3DRealms shareware install or a registered or retail version to ~/.jfsw (I used my MacPlay CD and named it swmac.grp). Shadow Warrior used redbook audio for the retail version, so for music, rip the tracks and save them as track02.ogg (intro) to track14.ogg ("Lo Wang Raps") in the same directory. Then go to where you've built JFSW and start the game with ./sw, and a configuration window will appear to select your resolution. Note that while widescreen resolutions are supported (and look good), the game still uses 4:3 assets, so things like Lo Wang's sword will be cut off.

A note on resolutions and colour depth: 8bpp modes are rendered 100% in software, which is very fast even on Blackbirds with just BMC graphics, and works beautifully on virtually any system. If you select a 24bpp mode, the game will try to use OpenGL. On my system this caused a freeze (actually an infinite loop, once I stepped through it in a debugger) whenever it attempts to render reflections in a mirror. This appears to be related to non-POT texture support which virtually every card anybody would be running probably supports properly. If you get the same freeze, kill the game and edit jfbuild/src/polymost.c. On line 4903 or thereabouts you'll see if ((method & METH_POW2XSPLIT) && (tsizx != xx)) which if you change to if (0) will get around the code that glitches. I can't tell if this is specific to my card, to OpenPOWER or to gcc, and it doesn't happen in software mode, which plays 100% fine all the way to the end including nuking Zilla himself.

Don't mess with Lo Wang.

Firefox 109 on POWER

Firefox 109 is out with new support for Manifest V3 extensions, but without the passive-aggressive deceitful crap Google was pushing (yet another reason not to use Chrome). There are also modest HTML, CSS and JS improvements.

As before linking still requires patching for bug 1775202 using this updated small change or the browser won't link on 64-bit Power ISA (alternatively put --disable-webrtc in your .mozconfig if you don't need WebRTC). Otherwise the browser builds and runs fine with the LTO-PGO patch for Firefox 108 and the .mozconfigs from Firefox 105.

In case you thought AIX had a future

In case you thought IBM AIX had a future, IBM's legacy proprietary Unix, IBM apparently doesn't. The Register reported Friday that IBM has moved the entire AIX development group to IBM India, apparently their Bangalore office, and placing 80 US-based developers into "redeployment." That's a fairly craven way of replacing layoffs with musical chairs, requiring the displaced developers to either find a new position within the company (possibly relocating as well) within some unspecified period, or retire. About a third of IBM's global staff is on the Indian subcontinent. IBM didn't publicly announce this move and while it's undoubtedly good news for IBM India it seems bad news for AIX's prospects: the technologies IBM thinks are up and coming IBM tends to spend money on, and so an obvious cost-cutting move suggests IBM doesn't think AIX is one of those things.

We've got a long history with AIX here at Floodgap Orbiting HQ when I first worked with AIX 3.2.5 and 4.1 in my University employment and consulting days, and I've run personal installations of AIX as my primary personal server since 1998, first on an Apple Network Server 500 and now on a 8203-E4A POWER6 p520. AIX 3 and 4 were surprisingly compelling workstation and server OSes for the time, but AIX 5L was where it started to feel "legacy" and unloved, and IBM has always been tightfisted about APARs and other kinds of updates if you don't buy a support contract. Combine that with nonsense like Capacity on Demand, where my second CPU was locked out after a system planar update until IBM coughed up a new set of keys, and I've already concluded this will be my last AIX server. While the next one will almost certainly be OpenPOWER, I'll probably run FreeBSD instead.

And, well, IBM would rather you ran Linux anyway on Power hardware, and so would their subsidiary Red Hat. If you're still an AIX institutional customer and you're still paying the bills, you'll still get support (just as you would with IBM i, the other white meat), but newly migrating to AIX is increasingly more trouble than it's worth paying for. Apparently IBM thinks so too.

Your X server may no longer swing both ways by default

As a long-time PowerPC and Power ISA bigot, there's a lot of Power-based hardware in this house — primarily Apple, but some IBM, and of course several Raptor systems. While many CPUs are capable of running big-endian or little-endian, Power ISA is probably the last architecture where there is still notable interest in running it in both modes: AIX, IBM i (a/k/a i5, AS/400), AmigaOS and OpenBSD run it big, FreeBSD primarily runs it big (but work exists to run it little), and most Linux distros run it little. Compare with the ostensibly bi-endian ARM and MIPS, which virtually all run little, and SPARC, which virtually all runs big (versus s390x, which only runs big, and of course x86 and x86_64 only runs little). Little-endian is gradually displacing big-endian even in the Power world (sorry), but it's still important.

When it was more commonplace for a discrepancy to exist, such as between mainframes and desktop X terminals or PCs, a feature was added to the X protocol where a connecting X client would advertise its endianness and if this did not match the server's, the server would byteswap for it. (Note that current Xorg may not allow remote connections without passing -listen tcp either from gdm/your display manager of choice or on the command line. On my Fedora 37 system, I do startx -- -listen tcp to enable incoming connections on my secured wired network. Don't forget anything you need to do with xhost or other authorizations. ssh forwarding is of course an alternative means.) This makes running X clients from my AIX POWER6, which is strictly big, possible on my Fedora 37 Talos II, which Fedora runs little. Here's the old beast now from the "WalMart server rack" next door.

And here's proof of connection in my usual KDE Plasma desktop (running aixterm and xlogo), showing that even the most current Xorg still supports it.
A new change to Xorg will now prohibit automatic byteswapping in the X server by default. A client connecting to a server that advertises a different endianness will be kicked off with an error. If you want this support, you'll either need to pass +byteswappedclients on the command line to the X server, or put "AllowByteSwappedClients" "on" in the Options stanza in your xorg.conf. This is also a change request for Fedora 38 which of this writing is still proposed and not accepted.

This means not only will this usage of a big-endian client to a little-endian server, which I use infrequently but not rarely, not work without changes, but will also fail for anyone running a bleeding-edge version of Xorg on a big-endian host (say, Linux on your Power Mac G5) that wants to run clients like a more current web browser from a little-endian server. The latter case is certainly less common than the former (mostly retrocomputing, whereas there are mainframe apps that people will want to have a local interface for), but I think there's more out there of both than folks suspect. Chesterton's fence and all that.

I will say that I appreciate this being turned into an option rather than outright removed, keeping in mind this is usually a prelude for outright removal later. After all, the code seems to have no test coverage in a codebase poorly covered by testing generally, and has caused documented security problems in the past. To the extent this is a better compromise than talking to the hand I support it. However, it also makes Wayland even less attractive than it already is because the ability to pass an option to Xwayland is compositor-specific (see this bug for, among others, GNOME Mutter), meaning you're at the mercy of what you're running and may not be able to change it easily yourself. Well, we're Xorg unto death around here anyway.