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

const gpu = new GPU({ mode: 'gpu' });

for (let i = 0; i < 1000; i++) { //1000 seems... so small...
  const setup = setupBenchmark(i * 512);
  benchmark(setup);
}

function setupBenchmark(size) {
  const width = size;
  const height = size;
  return {
    kernel: makeKernel(width, height),
    inputA: randomMatrix(width, height),
    inputB: randomMatrix(width, height),
  };
}

function benchmark(setup) {
  setup.kernel(setup.inputA, setup.inputB);
}

function makeKernel(width, height) {
  const multiplyMatrix = gpu.createKernel(function(a, b) {
    let sum = 0;
    for (let i = 0; i < 512; i++) {
      sum += a[this.thread.y][i] * b[i][this.thread.x];
    }
    return sum;
  }, { output: [width, height] });
  return multiplyMatrix;
}

function randomMatrix(width, height) {
  const rows = [];
  for (let y = 0; y < height; y++) {
    const columns = new Float32Array(width);
    rows.push(columns);
    for (let x = 0; x < width; x++) {
      columns[x] = Math.random();
    }
  }
  return rows;
}