Glicol (an acronym for "graph-oriented live coding language") is a computer music language with both its language and audio engine written in Rust programming language, a modern alternative to C/C++. Given this low-level nature, Glicol can run on many different platforms such as browsers, VST plugins and Bela board. Glicol's synth-like syntax and powerful audio engine also make it possible to combine high-level synth or sequencer control with low-level sample-accurate audio synthesis, all in real-time.

Get started

🚀 The Web App

The easiest way to try Glicol:

https://glicol.org

There you can find guides, demos, docs, and apps for collaboration.

🎁 For Audio Dev

🍿 YouTube Channel

Find Glicol demo vidoes in this playlist.

Philosophy of Glicol

The motivation of Glicol is:

• to help people with zero knowledge of coding and music production to get started with live coding

• to offer experienced music coders a tool for quick prototyping and hacking

In NIME community, it is known as:

low entry fee and high ceilings

This is Glicol's philosophy to approach these goals:

• design the language from a new instrument design perspective

• embrace the spirit of the internet for a better experience

Reflected in the implementation:

• Glicol adopts a graph-oriented paradigm

• Glicol can be used in browsers with zero-installation

Graph-oriented

The basic idea of Glicol is to connect different nodes like synth modules.

All you need to know is the audio input/output behaviour of each node.

Two ways for connecting: >> and ~reference:

// amplitude modulation and lazy evaluation example
// chain with ~ is a ref chain and will not be sent to the DAC

o: sin 440 >> mul ~amp
~amp: sin 1.0 >> mul 0.3 >> add 0.5

It also applies to sequencer and sampler:

// sequencer pattern
// first divide one bar with space
// then further divide each part based on midi number and rest(_)

o: speed 2.0 >> seq 60 _~a _ 48__67
>> sp \blip

// quantity alters probability
~a: choose 60 60 0 0 72 72

As mentioned above, you can try these examples on:

https://glicol.org

If you want, you can even hear how a seq node work:

o: speed 2.0 >> seq 60 _72 _ 48__67 >> mul 0.5

This is actually analogous to how hardware module pass signals.

It is very easy to remember and to get started.

When Glicol is used in education, we can let students see and hear each node, even including 'envelope'.

Just leave the introduction of data types, Object or Function later when we mix JavaScript with Glicol.

Zero-installation

For the audio engine, instead of mapping it to existing audio lib like SuperCollider, I decide to do it the hard way:

• write the parser in Rust

• write the audio engine in Rust that works seamlessly with the AST processing

• port it to browsers using WebAssembly, AudioWorklet and SharedArrayBuffer

The main reason is to explore performant audio in browsers for easy access and live coding collaboration.

The reward is that we now have an Rust audio lib called glicol_synth:

It can run on Web, Desktop, DAW, Bela board, etc.

And one more thing.

To write everything from low-level also opens the door for meta node.

Now I can explain to students, the hello world tone can also be written in this way:

o: meta `
    output.pad(128, 0.0);
    for i in 0..128 {
        output[i] = sin(2*PI()*phase) ;
        phase += 440.0 / sr;
    };
    while phase > 1.0 { phase -= 1.0 };
    output
`

Roadmap

• 0.1.0 hello world from dasp_graph and pest.rs, pass code from js to wasm, and lazy evaluation
• 0.2.0 pass samples from js to wasm, support error handling, bpm control in console
• 0.3.0 build complex node plate reverb using basic node from glicol, using macro in Rust
• 0.4.0 use LCS algorithm and preprocessor for smooth and efficient whole graph updating
• 0.5.0 build const_generics to dasp_graph and use it in glicol, use SharedArrayBuffer, support local sample loading
• 0.6.0 refactor the code to modules:
  • glicol-main = glicol-synth + glicol-parser + glicol-ext
  • glicol-ext = glicol-synth + glicol-parser + glicol-macro
  • glicol-js = glicol-main + glicol-wasm
• 0.7.0 support mixing js with glicol in glicol-js using Regex; add visualisation
• 0.8.0 embed Rhai in glicol 🎉
• 0.9.0 redesigned architecture; see the release note
• 0.10.0 run as a VST plugin
• 0.11.0 run on Bela
• 0.12.0 distribute as a npm package
• better music expressions, more variation for seq nodes
• exploring new forms of musical interactions

Note that Glicol is still highly experimental, so it can be risky for live performances. The API may also change before version 1.0.0.

Please let me know in issues or discussions:

• your thoughts on the experience of glicol
• new feature suggestion
• bug report, especially the code that causes a panic in browser console
• missing and confusion in guides and reference on the website