A starter null0 cart, in Rust.

Press Use this template to make your own, then search the project for mygame and rename it to whatever your game is called.

Everything is built inside docker, so you never install cargo, wasm32-unknown-unknown yourself. All you need is docker, plus node for the shortcuts below.

npm start

That builds webroot/mygame.null0, serves webroot/, and rebuilds whenever you edit something in cart/. To build once, without the server:

npm run build

Or call docker yourself:

rm -f webroot/mygame.null0
docker run --rm --user $(id -u):$(id -g) -v ./cart:/src -v ./webroot:/out ghcr.io/notnullgames/null0-cart-rust:latest mygame

Your code is in cart/src/lib.rs. A cart implements the callbacks it cares about and the host skips the rest:

#[no_mangle] pub extern "C" fn load() {}

• no_std, crate-type = ["cdylib"], panic = "abort".
• The declarations live in an extern "C" block, so every call is unsafe.

You do not need to copy any null0 bindings into this project - the docker image bakes the current carts/rust/src/lib.rs in for you.

• Rust carts - the whole API, in Rust
• Anatomy of a cart - callbacks, input, distribution
• API reference

Two workflows come with this template:

• Publish builds the cart and deploys webroot/ to github-pages on every push to main, so anyone can play your game in a browser without installing anything.
• Release attaches mygame.null0 to any github release you create.

Players who want it natively can grab the runtime and run null0 mygame.null0.