Indigo is a game engine written in Scala for functional programmers. It allows game developers to build games using a set of purely functional APIs that are focused on productivity and testing.

Indigo is built entirely on Scala.js + WebGL, but it's sbt and Mill plugins will export games for web, desktop (via Electron), and mobile (via Cordova). Hypothetically consoles could also be supported.

Documentation can be found on indigoengine.io.

The root of the project contains a very very simple flake.nix file that, if you have nix installed and flakes enabled, will give you all the tools you need to build Indigo by running nix develop in the root directory.

You will need:

• Mill
• SBT
• JDK (Update: 8 works, 17 is used in Indigo's development)

On Mac / Linux, from the repo root to do a full build and test:

bash build.sh

On Windows, open up powershell and run:

& build.ps1

There is also another script which is a bit faster since it doesn't build the examples or demos.

bash localpublish.sh

The list above covers the software needed to build Indigo itself, but to run a game you may also need:

• NPM and/or Yarn
• NodeJS
• Electron
• An http server that will serve static from a directory (suggestions: http-server via npm, or Python's SimpleHTTPServer)
• A frontend packaging tool such as Parcel.js