module.exports = scaleAndAdd

/**
 * Adds two vec4's after scaling the second operand by a scalar value
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @param {Number} scale the amount to scale b by before adding
 * @returns {vec4} out
 */
function scaleAndAdd (out, a, b, scale) {
  out[0] = a[0] + (b[0] * scale)
  out[1] = a[1] + (b[1] * scale)
  out[2] = a[2] + (b[2] * scale)
  out[3] = a[3] + (b[3] * scale)
  return out
}