psincf / Cells

singleplayer game inspired by agar.io written in Rust

Cells

Cells is a singleplayer game inspired by agar.io written in Rust.
Every cell/entity can have a mix of differents capabilities.

It's been optimized so that 1 million+ entities can be in game at the same time, but full FPS is not guaranteed with this amount of entities!

Demo.mp4

Status

It's a demo/experiment.
It is no more actively developed.
Some hacky code here and there!

How to run

git clone https://github.com/psincf/Cells
cd Cells
cargo run --release

Features

• In-game Editor
• Multiples examples maps

Controls

Ingame

• Mouse: moving
• Space: split
• W: throw cell
• R: revive
• Right CTRL: Enter/Leave Debug Mode

Debug Mode

• R: Revive/reset mass of local cells to minimum
• E: Local cells can merge
• Right click: Teleport
• Z: Augment Mass
• Up: add 1 computing thread
• Down: remove 1 computing thread
• +: add cells speed
• -: remove cells speed
• *: Multiply cells speed by 2
• /: Divide cells speed by 2

Engine detail

• Multithreaded. Amount of threads can be changed in real time.
• Struct Of Arrays optimization
• Cells can have multiple different properties/capabilities
• Custom threadpool crate
• Custom multithreaded physics engine
• Custom reflection crate written with procedural macro ( #[derive(Reflect)] )
• Custom automatic inspection crate for reflected struct with both Imgui and Egui ( inside reflect crate).
  Used for Editor mode.
• Custom profiling crate (benchmark). Real time profiling data can be seen in Debug mode
• Separate threads for Graphics and Update -> Synchronization through a quintuple buffer
  The quintuple buffer allow the retrieval of the last 2 game updates on each frame. A timer mesuring the elapsed time between 2 game updates is constantly updating. Thanks to this, interpolation can be done and the game can be at full FPS even if the Update thread is lagging.
• Custom Slab implementation
• WASM scripting (a bit hacky and limited)