noVNC/core/wasm/README.md

noVNC + wasm

This is a WebAssembly proof-of-concept.

It is based on information from the following sources:

• https://hacks.mozilla.org/2018/04/javascript-to-rust-and-back-again-a-wasm-bindgen-tale/
• https://www.hellorust.com/demos/canvas/index.html
• https://github.com/rustwasm/wasm-bindgen/blob/master/examples/julia_set/
• https://github.com/rustwasm/wasm_game_of_life/

Prep:

docker build -t rust-wasm ./core/wasm

docker run -it -v `pwd`:/novnc -w /novnc/core/wasm -p 8080:8080 rust-wasm bash

npm install

Build:

npm run build-release  # or run build-debug (10x slower code)
npm run serve          # then visit localhost:8080 outside the container

Note that run server will automatically detect modification to index.js and reload the page.

Preliminary results:

• 2048x1024, draw1, release: 66.7ms

• 2048x1024, draw2, release: 34.1ms ( 21.7ms / 12.4ms)

• 2048x1024, draw3, release: 29.9ms ( 15.1ms / 14.8ms)

• 1024x1024, draw1, release: 47.5ms

• 1024x1024, draw2, release: 21.8ms ( 12.0ms / 9.8ms)

• 1024x1024, draw3, release: 16.7ms ( 6.9ms / 9.8ms)

• 1024x1024, draw1, debug: 376.6ms

• 1024x1024, draw2, debug: 132.4ms (129.1ms / 3.3ms)

• 1024x1024, draw3, debug: 131.4ms (128.8ms / 2.6ms)