docker-libopenmpt

Build updated libopenmpt versions inside a docker container, for WMPlay and other javascript web players.

Replace libopenmpt.js file to update (and/or worklet or wasm files).

Original by DrSnuggles, included with chiptune3

Download

Get files from Releases (created by this Action)

Build

To build locally, clone this repo and run build script

Linux: run make.sh

Windows: run make.bat (tested with Docker Desktop)

Compiling takes anywhere from 5-10 minutes on a 'modern' avg. 8 core cpu (2025).

There are a few options you can set inside the scripts:

VERSION=0.8.3   # libopenmpt version
CORES=8         # use <num> cpu cores to compile, change to match your cpu (default=8)
TARGET=wasm     # audioworkletprocessor, wasm or js (default=wasm)
CLEANUP=0       # set to 1 to remove docker container and images (default=0)
LOCAL_MINI=0    # set to 1 to run brotli locally instead of in container (default=0)

Sources

Emscripten

Image: https://hub.docker.com/r/emscripten/emsdk

For changes, watch: https://github.com/emscripten-core/emscripten/blob/main/ChangeLog.md

Libopenmpt

Releases: https://lib.openmpt.org/files/libopenmpt/src/

Autobuilds: https://builds.openmpt.org/builds/auto/libopenmpt/src.makefile/

Dockerfile

Uses latest emsdk image and libopenmpt-${VERSION}+release.

Additional EXPORTED_FUNCTIONS, DEFAULT_LIBRARY_FUNCS_TO_INCLUDE and EXPORTED_RUNTIME_METHODS can be changed in Dockerfile or passed as --build-args in build scripts.

Changelog

empscripten 4.0.15 works with libopenmpt-0.8.3

• 4.0.1x add HEAP8,HEAPU8,HEAPU32,HEAPF32 to EXPORTED_RUNTIME_METHODS
• 4.0.7 add HEAP8,HEAPU32 to EXPORTED_FUNCTIONS (no longer exported by default)
• 3.1.57 update DEFAULT_LIBRARY_FUNCS_TO_INCLUDE
• 3.1.5x update EXPORTED_FUNCTIONS
• 3.1.21 add writeAsciiToMemory to exports, its removed from emscripten (TODO: replace with js function)