Function mathRandomUnique

test/internal/math.random.js:7–41

(mode)

describe('Math.random() unique');

function mathRandomUnique(mode) {
  const gpu = new GPU({ mode });
  const checkCount = 20;
  let seed1 = Math.random();
  let seed2 = Math.random();
  let stub = sinon.stub(mathRandom, 'onBeforeRun').callsFake((kernel) => {
    kernel.setUniform1f('randomSeed1', seed1);
    kernel.setUniform1f('randomSeed2', seed2);
  });
  try {
    gpu.addNativeFunction('getSeed', `highp float getSeed() {
    return randomSeedShift;
  }`);
    const kernel = gpu.createKernel(function () {
      const v = Math.random();
      return getSeed();
    }, {output: [1]});
    const results = [];
    for (let i = 0; i < checkCount; i++) {
      const result = kernel();
      assert.ok(results.indexOf(result[0]) === -1, `duplication at index ${results.indexOf(result[0])} from new value ${result[0]}.  Values ${JSON.stringify(results)}`);
      results.push(result[0]);
      seed2 = result[0];
      assert.ok(stub.called);
      stub.restore();
      stub.callsFake((kernel) => {
        kernel.setUniform1f('randomSeed1', seed1);
        kernel.setUniform1f('randomSeed2', seed2);
      });
    }
  } finally {
    stub.restore();
    gpu.destroy();
  }
}

test('unique every time auto', () => {
  mathRandomUnique();