Function hasFeatures

docs/tests/v2/es6/js/sanddance.js:10081–10086

(gl, features)

}

function hasFeatures(gl, features) {
  features = Array.isArray(features) ? features : [features];
  return features.every(function (feature) {
    return getFeature(gl, feature);
  });
}

function getFeatures(gl) {
  gl.luma = gl.luma || {};