Rust to Web assembly experiment

Drawing a Mandelbrot fractal in the browser, importing a Rust function compiled to WebAssembly. Compare speed with raw JS.

See /docs/ to start the project.

Startup

source ../emsdk-portable/emsdk_env.sh
source $HOME/.cargo/env

Compile Rust files to Web Assembly

rustc --target=wasm32-unknown-emscripten src/mandelbrot.rs -o weba/mandelbrot.html

The build goes to /weba/. It produces a ".wasm", a ".js" and a ".html" file.

• The .wasm is the WebAssembly binary file.
• The .html is ready to load in a browser with a built-in console.
• The .js is the file to load in a <script> tag in order to use wasm functions in JS.

Run in a web page

• Go to /weba/

• Run a web server at localhost:8000:

  ```
  python -m SimpleHTTPServer
  ```
  

• Make sure web assembly is enabled in the browser

  • Chrome: chrome://flags -> "WebAssembly" stuff
  • Firefox: about:config -> "wasm" stuff

• Go to localhost:8000/index.html in a browser.