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Halley Game Engine

A lightweight game engine written in C++17. It has been used to ship Wargroove, a turn-based strategy game, on Windows, Mac (experimental), Nintendo Switch, Xbox One and PS4 (with experimental Android and iOS ports WIP).

The Halley Game Engine is licensed under the Apache 2.0 license.

Check out this repo for a sample game (our Global Game Jam 2020 entry).

Join us on our Discord server!

Design guidelines & objectives

  • Modern graphics pipelines, with first-class shader support
  • Written in modern C++
  • "True" entity system based, with components that store data and systems that operate on families of components
  • Tuned for high performance
  • Code-first: no reliance on editor to generate anything
  • Easy to use: games should be easy to implement
  • Easy to maintain: games should be easy to keep working on long-term, after it has grown to a large project size
  • Cross-platform: support as many platforms as possible
  • No legacy: don't bother supporting legacy systems, such as Windows XP or older Android/iOS devices
  • Rich tools: where possible, provide tools to assist in development and debugging
  • Fast iteration time: hot-reloading wherever possible
  • Support scripting in other languages, such as Lua


Halley is divided in a several sub-projects:

  • engine
    • core: Core features of the engine, including looper, API management, resources, and graphics engine
    • audio: Audio engine
    • entity: Framework for dealing with entities, components, and systems
    • utils: Utilities library
    • net: Networking library
    • ui: UI library
  • plugins
    • asio: Network/Asio implementation
    • dx11: Video/DX11 implementation
    • opengl: Video/OpenGL implementation
    • metal: Video/Metal implementation (experimental)
    • sdl: System/SDL, Input/SDL and AudioOut/SDL implementations
    • winrt: System/WinRT, Input/WinRT, Platform/WinRT and AudioOut/XAudio2 implementations
  • tools
    • editor: Editor UI
    • cmd: Command-line interface to tools
    • runner: Provides an entry point for execution and dynamic reloading. Highly experimental.
    • tools: Editor tools to generate files and assets
  • tests
    • entity: Stress test of entity system
    • network: Stress test of network system
  • samples
    • (The samples project was taken down due to being too outdated, sorry about that!)


The following platforms are supported:

  • Windows: Tested on Windows 10 Professional 64-bit (Might work on as low as XP 32-bit, but XP is no longer a tested target)
  • Mac OS X: Tested on Mac OS X 10.9.6
  • Linux: Tested on Ubuntu 16.04


Tools required

  • CMake 3.10+
  • C++17 capable compiler:
    • Visual C++ 15.9 (Visual Studio 2017)
    • Clang 5
    • GCC 7

Library dependencies

  • Engine:
    • Boost 1.72.0 (header only)
    • OpenGL [optional]
    • SDL 2.0.2 (2.0.7 recommended) [optional]
    • Windows 10 SDK [optional]
  • Also required if building Tools:
    • Boost 1.72.0 libraries: filesystem, system
    • Freetype 2.6.3
    • yaml-cpp 0.5.3

Set up

  • Ensure that all dependencies above are set up correctly
  • Build with CMake
    • Typical:
      cmake -DCMAKE_INCLUDE_PATH=path/to/headers \
            -DCMAKE_LIBRARY_PATH=path/to/libs \
            -DBOOST_ROOT=path/to/boost ..
    • Engine only:
  • Run halley-editor tests/entity (or whichever other project you want to test)
  • Launch that project


The full documentation is available on the Wiki.