Overview

Multiplayer top-down shooter made from scratch in C++. Web version: https://play.hypersomnia.io Made in 🇵🇱 The project has 1K+ GitHub stars and is licensed under AGPL-3.0.

Key Features

Source: GitHub README

rectpack2D, written for packing textures, became famous and was used in Assassin’s Creed: Valhalla.
Used also by a drone manufacturing company and in 2 scientific papers.
My Entity-Component-System idea from 2013 describes techniques similar to Unity Engine patent from 2018.
See this discussion.
Networking is based on cross-platform simulation determinism. It is 100% deterministic even across browser and native clients (Windows, Linux, MacOS) and that includes native ARM builds (aarch64)!
This technique is traditionally used by RTS games with hundreds of continuously moving soldier units.
It is impractical to continuously update every single one of them through the network.
But Hypersomnia is not an RTS - since it’s physics-based, it uses floats heavily, not just integers.
When floating point calculations are involved, simulation determinism becomes extremely hard.
See why in this excellent article by Glenn Fiedler.