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Chocolate Doom w/ Telemetry

Compile and Check

This is an experimental fork of Chocolate Doom with the aim to introduce telemetry output for observing the behavior of both player and enemies during a game.

The original Chocolate Doom README is preserved under a different name: README.Original.md.

Building

In general, you can hack your way to a functional build system pretty easily, but the best place to get a list of the 3rd party dependencies is in the "Building Chocolate Doom on Windows" wiki page:

https://www.chocolate-doom.org/wiki/index.php/Building_Chocolate_Doom_on_Windows

I personally build and test on the following platforms:

  • Ubuntu 20.04 LTS
  • Windows 10 w/ msys2-x86_64 v20190524 (see notes for WSL2 below)
  • OpenBSD-current
  • macOS v13.3 (Ventura?)

I do this primarily using the automake/autoconf tooling and the resulting Makefiles, so if you have the proper dependencies (python, SDL2, SDL_Net, SDL_Mixer, etc.) it should just work in building local executables.

For instance, run the autogen script:

$ ./autogen.sh

Note: if building on Win10 64-bit, I recommend running: ./autogen.sh --host=i686-w64-mingw32

Then just build:

$ make

The resulting executable will be in ./src/ as chocolate-doom or chocolate-doom.exe (on Windows). You don't need to build the install package or bundled app, but if you do follow the official Chocolate Doom docs from their wiki.

Optional 3rd Party Dependencies

Kafka

If you'd like to add in Kafka support:

  • build/install librdkafka
  • make sure you've followed the librdkafka docs for SASL2 support
  • make sure it's accessible via pkg-config

If you'd like to disable building with librdkafka, pass --without-librdkafka to ./configure.

WebSockets

Right now, websocket support requires libtls from the LibreSSL project.

macOS & Homebrew

Things have changed quite a bit in the macOS world since I started this project. Currently, one needs to coax autoconf and pkg-config into finding dependencies for things like librdkafka:

$ PKG_CONFIG_PATH="/opt/homebrew/opt/openssl@1.1/lib/pkgconfig:/opt/homebrew/opt/cyrus-sasl/lib/pkgconfig" \
    ./configure --with-librdkafka

This appears to be due to trying to avoid conflicts with the SASL2 and OpenSSL libraries shipped by macOS.

Leveraging WSL2 on Windows 10

Msys2/mingw can be challenging to get working if you're trying to use librdkafka as a telemetry destination.

Using WSL2 can vastly simplify things, but you need to also do the following (assuming you use VcXsrv):

  • enable X11Forwarding in /etc/ssh/sshd_config
  • disable "Native OpenGL" in VcXsrv session
  • set LIBGL_ALWAYS_INDIRECT=0 in your enviornment
  • disable authentication in VcXsrv or learn how to get it working

Without the above, SDL2 seems to not work (at least as of Win10 v2004, build 19041.508).

Note: the above assumes using Ubuntu as the WSL2 environment

Running

You should first configure Choclate Doom, specifically the telemetry stuff I've build. After building the project per the above instructions, run: chocolate-doom or chocolate-doom.exe.

Configure the display settings as you see fit...personally I recommend turning off full-screen mode if you want to hack on things.

In the Configure Telemetry section, I've provided a few default settings, but see the TELEMETRY.md file for documentation on configuration settings. (You can also hit F1 in that setup screen to pop a web browser to the latest documentation.)

Telemetry

The event structure takes the following shape and is emitted in JSON:

{
  "damage": 10,
  "counter": 479,
  "session": "7372d46f7d83f353d9e1c18f",
  "type": "hit",
  "frame": {
    "millis": 11829,
    "tic": 414
  },
  "actor": {
    "position": {
      "x": 82759579,
      "y": -186153129,
      "z": 0,
      "angle": 3292528640,
      "subsector": 140365466405016
    },
    "type": "player",
    "health": 100,
    "armor": 0,
    "id": 140365466484344
  },
  "target": {
    "position": {
      "x": 85983232,
      "y": -213909504,
      "z": -1048576,
      "angle": 1073741824,
      "subsector": 140365466404840
    },
    "type": "barrel",
    "health": 10,
    "id": 140365466491112
  }
}

The target is optional.

Testing

Right now I have a hacky manual test that I also use for Valgrind (on Linux) mostly. To build it (and run it at the same time) run:

$ make check

You can either use make check to run the test code or run the resulting executable directly:

$ ./src/doom/test_events

You should see some console output:

----- TESTING MODE 1 -----
X_InitTelemetry: initialized filesystem logger writing to 'doom-1586357873.log'
X_InitTelemetry: enabled telemetry mode (1)
...log start
...log armor
...log weapon
...log enemy move
...log targeted
...log enemy killed
...log player move
...log player died
...stop
X_StopTelemetry: shut down telemetry service
----- TESTING MODE 2 -----
X_InitTelemetry: starting udp logger using SDL_Net v2.0.1
X_InitTelemetry: initialized udp logger to localhost:10666
X_InitTelemetry: enabled telemetry mode (2)
...log start
...log armor
...log weapon
...log enemy move
...log targeted
...log enemy killed
...log player move
...log player died
...stop
X_StopTelemetry: shut down telemetry service

If you want to use Valgrind to check for leaks, I suggest you run it on the test_events binary to focus testing primarily on my changes from the original chocolate-doom source.

Copyright and License

This fork contains works from other authors in addition to myself. Chocolate Doom is made available under the GPLv2. A copy is provided in COPYING.md.

Happy Hacking.