# Third-party software

Witchspace's own code is under the BSD 3-Clause License (`LICENSE` in the source,
`LICENSE.txt` in every download). The program and the web version also contain the following,
each under its own license. The license texts named below come with every download that
contains the component: the desktop downloads carry Nuked OPL3's and SDL2's, the web download
and the web site also Emscripten's and musl's.

| Component | Used for | License | Where |
|-----------|----------|---------|-------|
| [Nuked OPL3](https://github.com/nukeykt/Nuked-OPL3) 1.8 by Nuke.YKT, commit `765ec962e473aeb767e4cba74ffdc8f588ffbfe8`, unmodified | the AdLib's chip (an emulated OPL2), linked statically into the program and the web version | LGPL-2.1-or-later: `LICENSE.Nuked-OPL3.txt` (from `third_party/nuked-opl3/LICENSE`) | `third_party/nuked-opl3` |
| [SDL2](https://www.libsdl.org/) 2.32.10 by Sam Lantinga and contributors | window, input, sound; linked statically into the release binaries | zlib: `LICENSE.SDL2.txt` | built from source by CMake (`WS_VENDOR_SDL`) |
| [dr_mp3](https://github.com/mackron/dr_libs) by David Reid, commit `dfe8377631000664666519fdb83da193fd8037f4`, unmodified | the title's theme, when an MP3 is given | public domain (Unlicense) or MIT-0: `third_party/dr_mp3/LICENSE` | `third_party/dr_mp3` |
| [Emscripten](https://emscripten.org/)'s runtime, with [musl](https://musl.libc.org/) libc | the web version's JavaScript and C library | MIT (or UIUC): `LICENSE.Emscripten.txt`; musl's MIT: `LICENSE.musl.txt` | linked by the Emscripten build |
| Emscripten's SDL2 port (SDL2 2.32.10) | the web version's window, input, sound | zlib: `LICENSE.SDL2.txt` | fetched and linked by the Emscripten build |

## Nuked OPL3 and the LGPL

The LGPL lets you change the library and use your changed version with Witchspace. The
complete source of each release is public at its tag (for example
<https://github.com/rembish/witchspace/tree/v0.1.8>). To relink with your own version of Nuked
OPL3, replace `third_party/nuked-opl3/opl3.c` and `opl3.h` and build as the README says:

```sh
cmake -S . -B build && cmake --build build -j
```

For the web version, build with Emscripten (`make web`).

## Not included

Witchspace contains no part of Elite Plus, nor the Elite theme's recording. It reads the
game's data (and the theme, if given) from your copy, and the web version fetches it in your
browser. Elite © 1984 David Braben and Ian Bell; Elite Plus © 1991
Chris Sawyer, Realtime Software, and Bell & Braben.