mirror of
https://github.com/KarolS/millfork.git
synced 2024-11-18 22:07:07 +00:00
43 lines
654 B
Plaintext
43 lines
654 B
Plaintext
|
|
import random
|
|
|
|
#if not(ARCH_6502)
|
|
#warn random_6502 module should be only used on 6502-compatible targets
|
|
#endif
|
|
|
|
asm byte rand() {
|
|
? ldx #8
|
|
? lda rand_seed+0
|
|
__rand_loop:
|
|
asl
|
|
? rol rand_seed+1
|
|
bcc __no_eor
|
|
eor #$2D
|
|
__no_eor:
|
|
dex
|
|
bne __rand_loop
|
|
? sta rand_seed+0
|
|
? rts
|
|
}
|
|
|
|
|
|
#if CBM_64
|
|
|
|
void init_rand_seed() {
|
|
poke($D40E, $ff)
|
|
poke($D40F, $ff)
|
|
poke($D412, $80)
|
|
while vic_raster != $70 {}
|
|
rand_seed.hi = peek($D41B)
|
|
while vic_raster != $40 {}
|
|
rand_seed.lo = peek($D41B)
|
|
}
|
|
|
|
#else
|
|
|
|
inline void init_rand_seed() {
|
|
// TODO: find a better source of randomness
|
|
rand_seed = 1
|
|
}
|
|
|
|
#endif |