Dockerfile.emscripten

# Emscripten WASM builder for reone (lazy /game + Asyncify + SDL3 port).
#
# Build image:
#   docker build -f Dockerfile.emscripten -t reone-emscripten .
#
# Configure + compile (mount your checkout at /src):
#   docker run --rm -v "${PWD}:/src" -w /src/build-web-docker reone-emscripten bash -lc '
#     source /emsdk/emsdk_env.sh &&
#     emcmake cmake .. -GNinja -DCMAKE_BUILD_TYPE=Release \
#       -DBoost_INCLUDE_DIR=/opt/reone/boost-include -DBoost_NO_BOOST_CMAKE=ON &&
#     ninja engine
#   '
#
# PowerShell:
#   docker run --rm -v "${PWD}:/src" -w /src/build-web-docker reone-emscripten bash -lc "source /emsdk/emsdk_env.sh && emcmake cmake .. -GNinja -DCMAKE_BUILD_TYPE=Release -DBoost_INCLUDE_DIR=/opt/reone/boost-include -DBoost_NO_BOOST_CMAKE=ON && ninja engine"
#
# Why /opt/reone/boost-include: CMake must not use -I/usr/include with emcc (breaks with host glibc
# headers). Copy only the boost/ tree and point Boost_INCLUDE_DIR at its parent.

FROM emscripten/emsdk:latest

ENV DEBIAN_FRONTEND=noninteractive \
    EMSDK_QUIET=1

RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        ninja-build \
        libboost-dev \
        ca-certificates \
    && rm -rf /var/lib/apt/lists/*

RUN mkdir -p /opt/reone/boost-include \
    && cp -a /usr/include/boost /opt/reone/boost-include/

ENV REONE_BOOST_INCLUDE_DIR=/opt/reone/boost-include

RUN bash -lc 'source /emsdk/emsdk_env.sh && embuilder build sdl3'

WORKDIR /src

# Interactive shell with emcc on PATH (mount repo to /src).
CMD ["bash", "-lc", "source /emsdk/emsdk_env.sh && exec bash"]