View on GitHub

FOnline Engine

Flexible cross-platform isometric game engine

FOnline Engine

Engine currently in semi-usable state due to heavy refactoring

License GitHub Codecov Codacy Commit

Table of Content


Important note: Not all from described above features are already implemented, for additional information look at ‘Work in progress’ section below.


Engine doesn’t targeting to use directly but by as part (submodule) to your own project (git repo).
Repository contains source code of engine, third-party sources and build tools for composing all this and your stuff into final platform-specific bundles.
You build your game fully from source, there is no prebuilt binaries, full control over the process.
Todo: write about cmake workflow

Public API

Documents related to public API:

Scripting api automaticly generated for each project individually and api described in Scripting API is only basic.
See example of extended scripting api at FOnline TLA Scripting API.


General steps:

Reference project:

Package dependencies

Following Linux packages will help us build game for target platforms.

Build scripts download and install following packages:

List of tools for Windows operating system (some optional):

List of tools for Mac operating system:

Other stuff used in build pipeline:

Statically linked packages

These packages included to this repository, will compile and link statically to our binaries.
They are located in ThirdParty directory.


Despite on many third-party libraries that consumed by the whole engine one of the main goal is small final footprint of client/singleplayer output.
Aim to shift most of things of loading specific image/model/sound/ect file formats at pre publishing steps and later use intermediate binary representation for loading resources in runtime as fast as possible and without additional library dependencies.
This process in terms of fonline engine called Bakering.
Also as you can see all third-party dependencies linked statically to final executable (except one - proprietary libfbxsdk.dll/so for Baker but the last one is not target for small footprint) and this frees up end user from installing additional runtime to play in your game.
Todo: write about memory footprint
Todo: write about network footprint


Please follow these instructions to understand how to use this engine by design:

Work in progress


Todo list (generated from source code)

Repository structure

Frequently Asked Questions

Todo: write FAQ