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This is an attempt to port Jason Rohrer's Passage (2007) to the Web via Emscripten.

Very Quick Start

If you just want to play the game, you can either visit or open dist/index.html in your browser.

Quick Start

First, you will need to download and install Emscripten. You can verify everything is working by running emcc.

Then do:

cd Passage_v4_UnixSource

To build with optimizations, run:

EMCC_FLAGS='-O2' ./runToBuild

Quick Start (Docker)

If you don't want to deal with installing the Emscripten toolchain on your system, you can install it via Docker and Docker Compose, though the container takes a very long time to build. Once Docker and Docker Compose are installed, run:

docker-compose build
docker-compose run em bash

At this point you will be in a bash shell in a container that has the Emscripten toolchain pre-installed. You'll be in the /usr/src/passage directory, which maps directly to the Passage_v4_UnixSource of your repository. So to build everything, you can just run ./runToBuild.


  • Emterpreter (specifically Emterpreter-Async) is used to manually control the call stack so the original code can work without too much refactoring.

  • See the history for Passage_v4_UnixSource/gamma256 for details on what was changed to support Emscripten; I tried to make sure that the commits are fairly clean and easy to understand.

  • Running emcc -v on my development environment yielded:

    emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.35.0
    clang version 3.7.0 ( dbe68fecd03d6f646bd075963c3cc0e7130e5767) ( 4e83be90903250ec5142edc57971ed4c633c5e25)
    Target: x86_64-unknown-linux-gnu
    Thread model: posix
    Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
    Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
    Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
    Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
    Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
    Candidate multilib: .;@m64
    Selected multilib: .;@m64

    It is entirely possible that different versions may cause compilation to fail.


The original Passage has been placed in the public domain.

This port is in the public domain as well.


Jason Rohrer's game "Passage" (2007), ported to the web via Emscripten.



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