function floor$1(out, a) {
    out[0] = Math.floor(a[0]);
    out[1] = Math.floor(a[1]);
    out[2] = Math.floor(a[2]);
    out[3] = Math.floor(a[3]);
    return out;
  }
Math.floor the components of a vec4

@param {vec4} out the receiving vector
@param {ReadonlyVec4} a vector to floor
@returns {vec4} out