Bauble

Bauble is a toy for composing signed distance functions in a high-level language (Janet), compiling them to GLSL, and rendering them via WebGL.

Try it out at https://bauble.studio/, or watch this video introduction where I model an infinite number of hot air balloons:

Note that Bauble has changed (for the better!) quite a bit since that video, so it doesn't translate one to one. But it should be able to give you a good idea of the gist.

For more examples, I sometimes tweet videos of Bauble's development, which you can find here:

https://twitter.com/ianthehenry

Dependencies

• janet
• emscripten
• redo
• yarn
• pngcrush (tests only)

Bauble requires at least Janet 1.36.0 (the first release with integer literal syntax). It may work with newer versions of Janet, assuming that the image format is compatible, but it's better to update the version of Janet that Bauble includes to match your local version if you want to upgrade.

Install the Janet dependencies:

$ (cd src && jpm -l deps)

Afterwards, install JavaScript dependencies with:

$ yarn
$ (cd studio && yarn)

Bauble depends on codemirror-lang-janet. If you want to make changes to the grammar, clone that repo and run yalc publish from the root of it. Then run yalc link codemirror-lang-janet in this repository, and you'll be able to see your changes locally.

Development

To build Bauble after installing dependencies:

$ redo

To create a minified, optimized build, use:

$ BUILD_MODE=prod redo

Lint the JS with:

(cd studio/; yarn eslint .)

And you can serve a local Bauble like this:

$ node_modules/.bin/alive-server public

Testing

There are two types of tests. Regular Judge unit tests:

$ (cd src; judge)

And snapshot tests, which require installing separate dependencies:

# you only have to do this once
$ (cd src && jpm -l deps)

After installing dependencies, run tests like this:

$ (cd tests; jpm -l janet suite.janet)

Snapshot tests will write a file called tests/summary.html. It's not a very good file.

Before you commit snapshot changes, run:

$ (cd tests; jpm -l janet gc.janet)

Which will delete old snapshots and compress new ones. This depends on pngcrush.

CLI

To run the Bauble CLI:

$ cd src
$ jpm -l deps
$ jpm -l build
$ build/bauble

Or, after installing dependencies, you can just invoke it with the interpreter:

$ cd src
$ jpm -l janet cli/init.janet

Currently the CLI is the only way to export high-resolution images, render images with non-square aspect ratios, view raw GLSL shader source, and export 3D meshes.