rightMultiplyVec2 = (vector, matrix) => {
  const [v0, v1] = vector
  const v2 = 0
  const v3 = 1
  let x = v0 * matrix[0] + v1 * matrix[1] + v2 * matrix[2] + v3 * matrix[3]
  let y = v0 * matrix[4] + v1 * matrix[5] + v2 * matrix[6] + v3 * matrix[7]
  const w = v0 * matrix[12] + v1 * matrix[13] + v2 * matrix[14] + v3 * matrix[15]

  // scale such that fourth element becomes 1:
  if (w !== 1) {
    const invw = 1.0 / w
    x *= invw
    y *= invw
  }
  return fromValues(x, y)
}
Multiply a 2D vector by a matrix (interpreted as 2 row, 1 column).

Calculation: result = v*M, where the fourth element is set to 1.
@param {vec2} vector - input vector
@param {mat4} matrix - input matrix
@returns {vec2} a new vector
@alias module:modeling/maths/mat4.rightMultiplyVec2