35 lines
462 B
NASM
35 lines
462 B
NASM
|
section "RNG Functions", ROM0
|
||
|
|
NextByte::
|
||
|
|
; Load seed
|
||
|
|
ld hl,wRNGSeed+3
|
||
|
|
ld a,[hl-]
|
||
|
|
ld b,a
|
||
|
|
ld a,[hl-]
|
||
|
|
ld c,a
|
||
|
|
ld a,[hl-]
|
||
|
|
|
||
|
|
; Multiply by 0x01010101
|
||
|
|
add [hl]
|
||
|
|
ld d,a
|
||
|
|
adc c
|
||
|
|
ld c,a
|
||
|
|
adc b
|
||
|
|
ld b,a
|
||
|
|
|
||
|
|
; Add 0x31415927 and write back
|
||
|
|
ld a,[hl]
|
||
|
|
add $27
|
||
|
|
ld [hl+],a
|
||
|
|
ld a,d
|
||
|
|
adc $59
|
||
|
|
ld [hl+],a
|
||
|
|
ld a,c
|
||
|
|
adc $41
|
||
|
|
ld [hl+],a
|
||
|
|
ld c,a
|
||
|
|
ld a,b
|
||
|
|
adc $31
|
||
|
|
ld [hl],a
|
||
|
|
ld b,a
|
||
|
|
ret
|