// http://www.jcgt.org/published/0009/03/02/
uvec3 pcg3d(uvec3 v) {
    v = v * 1664525u + 1013904223u;

    v.x += v.y * v.z;
    v.y += v.z * v.x;
    v.z += v.x * v.y;

    v ^= v >> 16u;

    v.x += v.y * v.z;
    v.y += v.z * v.x;
    v.z += v.x * v.y;

    return v;
}