random.fs library contains very basic xorshift random number generator (RNG).
Initialise the lib with by setting the
seed variable to a non-zero value first.
This can be done in a couple of ways:
require random.fs \ for some games using a constant value might be good enough : main 1234 seed ! ; \ common pattern in Forth, but essentially a constant in gbforth : main here seed ! ; \ use the divider register (from gbhw.fs) : main rDIV c@ 1 max seed ! ;
random ( n – n )
Generate a random number between 0 and n (exclusive).
rnd ( – n )
Generate a random number.