Function copy

docs/tests/v2/es6/js/sanddance.js:16061–16065

* Copy the values from one vec2 to another * * @param {vec2} out the receiving vector * @param {vec2} a the source vector * @returns {vec2} out

(out, a)

function copy(out, a) {
  out[0] = a[0];
  out[1] = a[1];
  return out;
}
/**
 * Set the components of a vec2 to the given values
 *