module.exports = transpose

/**
 * Transpose the values of a mat3
 *
 * @alias mat3.transpose
 * @param {mat3} out the receiving matrix
 * @param {mat3} a the source matrix
 * @returns {mat3} out
 */
function transpose(out, a) {
  // If we are transposing ourselves we can skip a few steps but have to cache some values
  if (out === a) {
    var a01 = a[1], a02 = a[2], a12 = a[5]
    out[1] = a[3]
    out[2] = a[6]
    out[3] = a01
    out[5] = a[7]
    out[6] = a02
    out[7] = a12
  } else {
    out[0] = a[0]
    out[1] = a[3]
    out[2] = a[6]
    out[3] = a[1]
    out[4] = a[4]
    out[5] = a[7]
    out[6] = a[2]
    out[7] = a[5]
    out[8] = a[8]
  }

  return out
}