## How to build with Emscripten Please use docker with the supplied `Dockerfile` to build for emscripten. It takes care of a few things: - Use a version of emscripten we know works - Patch in LibLZMA support (as this is not supported by upstream) First, build the docker image by navigating in the folder this `README.md` is in, and executing: ``` docker build -t emsdk-openttd . ``` Next, navigate back to the root folder of this project. Now we build the host tools first: ``` mkdir build-host docker run -it --rm -v $(pwd):$(pwd) -u $(id -u):$(id -g) --workdir $(pwd)/build-host emsdk-openttd cmake .. -DOPTION_TOOLS_ONLY=ON docker run -it --rm -v $(pwd):$(pwd) -u $(id -u):$(id -g) --workdir $(pwd)/build-host emsdk-openttd make -j$(nproc) tools ``` Finally, we build the actual game: ``` mkdir build docker run -it --rm -v $(pwd):$(pwd) -u $(id -u):$(id -g) --workdir $(pwd)/build emsdk-openttd emcmake cmake .. -DHOST_BINARY_DIR=../build-host -DCMAKE_BUILD_TYPE=Release -DOPTION_USE_ASSERTS=OFF docker run -it --rm -v $(pwd):$(pwd) -u $(id -u):$(id -g) --workdir $(pwd)/build emsdk-openttd emmake make -j$(nproc) ``` In the `build` folder you will now see `openttd.html`. To run it locally, you would have to start a local webserver; something like: ``` cd build python3 -m http.server ```` You can now play the game via http://127.0.0.1:8000/openttd.html .