taichi.js

taichi.js is a modern GPU computing framework for Javascript. It transforms Javascript functions into WebGPU Compute Shaders for massive parallelization. It is a Javascript version of the Python library Taichi.

Playground

On Chrome v113+, visit https://taichi-js.com/playground/ to see taichi.js in action. The webpage provides an interactive code editor that allows you to write, compile, and run taichi.js code.

Documentation

https://taichi-js.com/docs/docs/basics/getting-started

Sample Program

Provided that there exists a HTML canvas with id result_canvas, the following Javascript code will compute and animate a Julia Set fractal using WebGPU:

let fractal = async () => {
    await ti.init();

    let n = 320;
    let pixels = ti.Vector.field(4, ti.f32, [2 * n, n]);

    let complex_sqr = (z) => {
        return [z[0] ** 2 - z[1] ** 2, z[1] * z[0] * 2];
    };

    ti.addToKernelScope({ pixels, n, complex_sqr });

    let kernel = ti.kernel((t) => {
        for (let I of ndrange(n * 2, n)) {
            // Automatically parallelized
            let i = I[0];
            let j = I[1];
            let c = [-0.8, cos(t) * 0.2];
            let z = [i / n - 1, j / n - 0.5] * 2;
            let iterations = 0;
            while (z.norm() < 20 && iterations < 50) {
                z = complex_sqr(z) + c;
                iterations = iterations + 1;
            }
            pixels[(i, j)] = 1 - iterations * 0.02;
            pixels[(i, j)][3] = 1;
        }
    });

    let htmlCanvas = document.getElementById('result_canvas');
    htmlCanvas.width = 2 * n;
    htmlCanvas.height = n;
    let canvas = new ti.Canvas(htmlCanvas);

    let i = 0;
    async function frame() {
        kernel(i * 0.03);
        i = i + 1;
        canvas.setImage(pixels);
        requestAnimationFrame(frame);
    }
    requestAnimationFrame(frame);
};
fractal();

The canvas will show the following animation: