Open Source

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Atari, Hatari and games

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oak (at) helsinkinet fi

Open Source Software


Projects I've contributed to

I list here only projects to which I've done larger contributions. There are too many projects to list here all the patches (e.g. for Valgrind) and bug reports I've sent during the years.

Projects I'm currently involved in

Projects I've been involved with earlier

  • BadMooD, a Doom I/II port/rewrite for Atari Falcon (16Mhz 68030 @ 16bit bus, 32Mhz DSP). Hatari profiling support: BadMooD tracing / profiling automation scripts, for finding slowest frames and producing CPU + DSP profiles (with callgraphs) for them. Debugging of Hatari emulation specific issue like MIDI interrupts. (hobby)
  • Maemo tools and their version control for the 18 tools Nokia open sourced (work). Most technically advanced or extensive of these (18) system measurement and analysis tools are probably the resource usage tracing tools:
    • Functracer - a function tracer that can attach to any functions in a remote process that are listed in its libraries debug symbols files and trace their calls, or - attach to a set of functions predefined in given Functracer plugin and trace resource usage of these functions. Currently supported resource sets include: memory allocations, file descriptors, SYSV and POSIX shared memory segments, threads, Gobject references. Unlike ltrace, this supports also threaded programs and library-library calls. Unlike latrace, this can catch calls that don't go through .PLT tables. Unlike Valgrind, this can attach to already running processes. Downside of ptrace() usage is that every architecture and CPU instruction subset (like ARM thumb) requires specific support and currently this supports only 32-bit x86 and ARM.
    • Sp-rtrace - a resource tracer based on LD_PRELOAD. Unlike Functracer, this is CPU architecture independent and contains a large number of post-processing utilities (which can be used also to post-process Functracer data). Graphs include resource allocation timelines, top-down callgraphs, physical memory page utilization etc. This can be used to catch leaks which Valgrind Memcheck and Massif tools don't reveal, because former is mostly useful for finding pointer loss and latter gives only bottom-up view and doesn't help with smaller leaks. Sp-rtrace can be also do trace symbol resolving at post-processing phase on another machine if the target machine doesn't have enough memory for this.
  • Gramps - Genealogy program: statistics and graphviz plugins, Finnish localization (about 4000 strings + date & relationship plugins) for v2.x and v3.0. (hobby)
  • Airstrike - 2d dogfighting game: wrote nearly half of the code & did half of the ray-traced graphics. (hobby)
  • Requirements + testing for following X development tools (coded by Mathew Allum, known later from his OpenedHand fame): Xephyr, XResTop and XResponse. (work)

I've also created most of the graphics (which Pov-Ray sources are available under GPL) for the SolarWolf game implemented with PyGame. (hobby)

My own Atari projects

As I'm involved with Atari emulator and TOS (ROM) projects, I've also written some Atari specific programs and ported existing Atari programs to ANSI-C & newer C compilers so that they can be updated and built for newer/current Atari machines like Firebee.

Most of these programs are games, like:

  • Ballerburg
  • Filler
  • PUNSSi
  • ST-concentration

For more information, see my Atari programs page.

My own (multi-platform) projects

These are older projects originated in 90's when I had more time for my own projects. Below are listed still available sources and binaries for things which I have ported for several systems. I update them occasionally so that they build fine at least on Linux.

W Window System

In total the whole W window system contains about 150 000 lines of C-code of which I've written about a third. I became its maintainer in 1998 when Tesche and Kay became busy with other things.


console-board-games5 networked, console based board game user interfaces + computer player daemons for most of them
libw1.4The W Window System client library (Wlib)
libw2x1.4The Wlib-on-X emulation library (Wx2) which allows running Wlib and Wt based programs with the X server
libwt0.9The W Window System GUI toolkit library (Wt)
wluaA Lua interpreter with the W Window System support
wws-appsMore advanced W Window System applications
wws-baseThe W Window System server and its basic applications
wws-devThe development files for the W Window System libraries
wws-gamesThe W Window System games, dozen Wlib & Wt based single player games & toys and Wt GUIs for the above meantioned networked board games
wwsMetapackage for the W window system with scripts and docs

Applications include for example HTML v1 browser and a color terminal emulator. The server supports monochrome, 2, 4 and 8 bit graphics natively. Other bit-depths work through libSDL (for testing purposes).

Source package has also my code to get Heretic, HeightField Labratory and XMountains programs work with WWS.

W Window System screenshot

WWS has at some time been working on Linux (on top of SDL, GGI, framebuffer/GPM or SVGAlib), SunOS, Amiga NetBSD, Atari MiNT and MacMiNT. The SDL backend is currently the most tested one.

For more information on (older version of) WWS, see my historical pages.


Debianized sources for W are about 1.6MB:

To build the sources on Debian derived distributions after downloading them to "wws" directory, just do:

$ cd wws
$ dpkg-source -x wws_1.4.5.dsc
$ cd wws-1.4.5/
$ dpkg-buildpackage -uc -us -b

Then install the produced packages normally:

$ sudo dpkg -i ../*.deb

You can start WWS as normal user under X11 (for framebuffer access you would need root rights):

$ startw

On other platforms/distributions, look into the top level README in the extracted source package for the build instructions.

Mortar, a portable, multiplayer artillery game

Mortar is a simple "Scorched Earth" game clone with raytraced graphics. It can be compiled for Linux 8/16-bit frambuffer, SDL, GGI, DOS, Amiga or Atari. Other than the SDL and Atari backends haven't been tested for a while though.

Despite the game itself being fairly simple, it has 11 KLOCs of C-code. For portability reasons game engine cannot use any other libraries beside C-library (and couple of POSIX functions), so it needs to implement everything itself, even handling of graphics data. Platform specific code (in win-*.c and snd-*.c files) is there just to change palette, open/write to framebuffer/window, get keys from the user, and (optionally) play sounds. Timings code is also somewhat platform specific.

Game itself works internally with (chunky) 8-bit graphics with palette and platform specific code handles outputting it. In Atari case this means chunky to planar conversion to screen bitdepth on every update, which slows down things. On higher bit-depth screens, it may increase speed.

1/4 Mortar game screenshot

Sources for the latest version with Debian packaging (540KB):

Above sources include also a Qt GUI toolkit / C++ based settings editor and game launcher for the game:

QMortar GUI screenshot

Sources for an earlier version with Debian packaging for Maemo (524KB):

Mortar for N770/N800

An early Maemo binary package of Mortar (444KB) for the Nokia N770/IT2006 (maybe also later). The keys in the game are following:

Switch the game between fullscreen and windowed mode
Decrease (-)
Switch to previous weapon
Increase (+)
Switch to next weapon
Increase/decrease the shot power
Turn the cannon left/right
No functionality. To exit the game, switch to windowed mode and press the window close button until game exits.
Saves a game screenshot in PPM format to "Images" folder.

Clac calculator

Clac calculator has readline support for the command line version (tested on different Unix versions, MiNT and DOS) + a GEM GUI interface for Atari ST and later machines. There are also filter version of the calculator (which accompanied the commercial Atari Edith text editor) and a client-server one for the Atari MiNT OS. It understands operator predecence, hex/bin/dec/oct modes, trigonometric functions and complex number calculations. It was my first larger C program.

Clac GEM version screenshot

Sources for the latest version + atari binaries (350KB) with Debian packaging:


Naputus is a really simple memory and reflex game I wrote in Python to test the PyGame SDL bindings. It's a re-creation of a non-computer game used in Finnish "Spede show" game show...

1/4 Naputus screenshot

The sources are 38KB.

Larger Python programs

In case you're interested about my more advanced Python programs than "Naputus", I've also written in Python for example:

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