Grainboy

Make and play games with Grain 🌾

Overview

This is a Rust app that uses winit for windowing, wgpu for cross-platform graphics rendering, and wasmtime for running wasm game code.

Quick Start

1. Build the game

# will hot-reload the game if it's already running
rm *.wasm && grain compile --no-wasm-tail-call hello.gr

2. Start the app

cargo run

3. Run the game

Drag hello.gr.wasm onto the window and play! 🎮

Development

• windowing: src/lib.rs
• graphics rendering: src/gpu.rs
• user input structs:src/input.rs
• wasm runtime: src/wasm.rs
• spritesheet: src/spritesheet.
• shader: src/main.wgsl.
• grainboy bindings: grainboy.gr
• demo game: hello.gr

To start the app, exec cargo run.

Troubleshooting

If you see a message like

Failed to load dropped file: unknown import: `GRAIN$MODULE$runtime/gc::malloc` has not been defined

you may have dragged grainboy.gr.wasm onto the window instead of your entrypoint.