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doodle/wasm
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Noah 0c6c77a423 Lemon-shaped Ellipse Tool (WIP) 
* Add initial Ellipse Tool to the Editor Mode. Currently there's
  something wrong with the algorithm and the ellipses have a sort of
  'lemon shape' to them.
* Refactor the IterLine/IterLine2 functions to be more consistent.
  IterLine used to be the raw algorithm that took a bunch of coordinate
  numbers and IterLine2 took two render.Point's and was the main one
  used throughout the app. Now, IterLine takes the two Points and the
  raw algorithm function removed.
 		2019-07-14 14:18:44 -07:00
..
Makefile Initial WebAssembly Build Target 2019-06-26 18:40:40 -07:00
README.md Initial WebAssembly Build Target 2019-06-26 18:40:40 -07:00
index.html Initial WebAssembly Build Target 2019-06-26 18:40:40 -07:00
main_wasm.go Lemon-shaped Ellipse Tool (WIP) 2019-07-14 14:18:44 -07:00
server.go Demo Running Level as Title Screen Wallpaper 2019-06-27 22:59:36 -07:00
wasm_exec.js Initial WebAssembly Build Target 2019-06-26 18:40:40 -07:00

README.md

WebAssembly Port

Build and Test

Change to the wasm/ folder and type make to build doodle.wasm

To test it with a local Go server, cd to the wasm/ folder and run go run server.go and visit http://localhost:8080/

Copy the fonts and assets folders from the project root to the wasm/ directory so they're available over HTTP.

wasm_exec.js

To update the wasm_exec.js to match your version of Go:

# Fedora: install golang-misc
sudo dnf install golang-misc

# Copy the wasm_exec.js
cp $(go env GOROOT)/misc/wasm/wasm_exec.js ./

Font Support

Fonts are implemented as CSS embedded fonts configured in wasm/index.html

The font family name should match the filename, sans .ttf extension, for example "DejaVuSans-Bold". Doodle's internal logic converts a FontFilename string like "./fonts/DejaVuSans.ttf" into the base name to use as the font family. It also has fallbacks for sans-serif and serif in case of any problems.

Known Bugs and Limitations

  • github.com/kirsle/golog
    • The detection of an interactive terminal is broken in WASM.
    • terminal.IsTerminal(int(os.Stdout.Fd()))
    • As a workaround, comment it out and hardcode to false
  • Userdir
    • For WASM we'll want to use localStorage to store user drawings instead of the userdir.
  • Wallpaper support
    • WASM can't use os.Open to read the wallpaper image, so will need another method to load the image.
    • Texture caching support isn't implemented yet to hold the four corner textures of a wallpaper.
    • As a workaround, added a wallpaper.ready boolean and relevant functions exit early for WASM so wallpapers don't render at all.