diff options
Diffstat (limited to 'main.asm')
| -rw-r--r-- | main.asm | 76 |
1 files changed, 1 insertions, 75 deletions
@@ -810,82 +810,8 @@ Function2f3e: ; 2f3e INCLUDE "common/item.asm" +INCLUDE "common/random.asm" -Random: ; 2f8c -; A simple hardware-based random number generator (RNG). - -; Two random numbers are generated by adding and subtracting -; the divider to the respective values every time it's called. - -; The divider is a register that increments at a rate of 16384Hz. -; For comparison, the Game Boy operates at a clock speed of 4.2MHz. - -; Additionally, an equivalent function is executed in VBlank. - -; This leaves a with the value in hRandomSub. - - push bc - - ld a, [rDIV] - ld b, a - ld a, [hRandomAdd] - adc b - ld [hRandomAdd], a - - ld a, [rDIV] - ld b, a - ld a, [hRandomSub] - sbc b - ld [hRandomSub], a - - pop bc - ret -; 2f9f - -BattleRandom: ; 2f9f -; _BattleRandom lives in another bank. - -; It handles all RNG calls in the battle engine, allowing -; link battles to remain in sync using a shared PRNG. - - ld a, [hROMBank] - push af - ld a, BANK(_BattleRandom) - rst Bankswitch - - call _BattleRandom - - ld [$cfb6], a - pop af - rst Bankswitch - ld a, [$cfb6] - ret -; 2fb1 - - -Function2fb1: ; 2fb1 - push bc - ld c, a - xor a - sub c -.asm_2fb5 - sub c - jr nc, .asm_2fb5 - add c - ld b, a - push bc -.asm_2fbb - call Random - ld a, [hRandomAdd] - ld c, a - add b - jr c, .asm_2fbb - ld a, c - pop bc - call SimpleDivide - pop bc - ret -; 2fcb GetSRAMBank: ; 2fcb ; load sram bank a |