Build from source

You need CMake 3.24 or later and a C compiler for the native build (tests and tools), and the gasm SDK with wasi-sdk for the WebAssembly module (a script fetches both).

git clone https://github.com/emdzej/openmm && cd openmm
cmake -S . -B build && cmake --build build && ctest --test-dir build
tools/fetch-gasm-sdk.sh
cmake -S . -B build-gasm -DOPENMM_PLATFORM=gasm -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_TOOLCHAIN_FILE=.deps/gasm-c-sdk/cmake/gasm-toolchain.cmake -DWASI_SDK_PREFIX="$PWD/.deps/wasi-sdk"
cmake --build build-gasm

The module is build-gasm/openmm.wasm. Run it with a gasm runner (tools/fetch-gasm-runner.sh <platform> downloads the released one):

gasm-run build-gasm/openmm.wasm --asset disk=disk1.img

The native tests read the game from ./game (the floppy's files) or from OPENMM_DATA=<folder or image>, and skip without it.

Build from source ​

Build from source