perspective_RH_01

const m = perspective_RH_01!float(90, 2, 2, 4);
const vl = fvec(-2, -1, -2);
const vh = fvec(4, 2, -4);
const vc = fvec(0, 0, -3);

auto toNdc(in FVec3 v) {
    const clip = m * fvec(v, 1);
    return (clip / clip.w).xyz;
}

import gfx.math.approx : approxUlp;
assert(approxUlp( toNdc(vl), fvec(-1, 1, 0) ));
assert(approxUlp( toNdc(vh), fvec(1, -1, 1) ));
assert(approxUlp( toNdc(vc), fvec(0, 0, 2f/3f) ));