function transformMat4$1(out, a, m) {
    var x = a[0],
        y = a[1],
        z = a[2],
        w = a[3];
    out[0] = m[0] * x + m[4] * y + m[8] * z + m[12] * w;
    out[1] = m[1] * x + m[5] * y + m[9] * z + m[13] * w;
    out[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
    out[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;
    return out;
  }
Transforms the vec4 with a mat4.

@param {vec4} out the receiving vector
@param {ReadonlyVec4} a the vector to transform
@param {ReadonlyMat4} m matrix to transform with
@returns {vec4} out