kind-of-working-hashmap.js

const { GPU } = require('gpu.js');

const gpu = new GPU();
gpu.addFunction(function hash3D(x, y, z) {
  const ix = (Math.floor(x/this.output.x)) + 1e5,
      iy = (Math.floor(y/this.output.x)) + 1e5,
      iz = (Math.floor(z/this.output.x)) + 1e5;
  return ((ix * 10223) + (iy * 12919) + (iz * 16127)) % 1e6;
});

const kernel = gpu.createKernel(function() {
  return hash3D(this.thread.x, this.thread.y, this.thread.z);
}, { output: [2, 2, 2] });

console.log(kernel());