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TrashCanRandom:
ld d, 0
ld hl, .Jumptable
add hl, de
add hl, de
ld a, [hli]
ld h, [hl]
ld l, a
call JumpToAddress
ld e, a
ld d, 0
ret
.Jumptable:
dw .zero
dw .one
dw .two
dw .three
dw .four
.zero
.one
ld a, 0
ret
.two
call Random
and $1
ret
.three ; should return to a, instead returns to b
call Random
swap a
cp 1 * $ff / 3
ld b, 0
ret c
cp 2 * $ff / 3
ld b, 1
ret c
ld b, 2
ret
.four
call Random
and $3
ret
Yellow_SampleSecondTrashCan:
ld hl, GymTrashCans3c
ld a, [wGymTrashCanIndex]
ld c, a
ld b, 0
ld a, 9
call AddNTimes
call AddNTimes ; ????
ld a, [hli]
ld [hGymTrashCanRandNumMask], a
ld e, a
push hl
call TrashCanRandom
pop hl
add hl, de
add hl, de
ld a, [hli]
ld [wSecondLockTrashCanIndex], a
ld a, [hl]
ld [wSecondLockTrashCanIndex + 1], a
ret
GymTrashCans3c:
; First byte: number of trashcan entries
; Following four byte pairs: indices for the second trash can.
; BUG: Rows that have 3 trashcan entries are sampled incorrectly.
; The sampling occurs by taking a random number and seeing which
; third of the range 0-255 the number falls in. However, it returns
; that value to the wrong register, so the result is never used.
; Instead of using an offset in [0,1,2], the offset is instead
; in the full range 0-255. This results in truly random behavior.
db 4
db 1,3, 3,1, 1,-1, 3,-1
db 3
db 0,2, 2,4, 4,0, -1,-1
db 4
db 1,5, 5,1, 1,-1, 5,-1
db 3
db 0,4, 4,6, 6,0, -1,-1
db 4
db 1,3, 3,1, 5,5, 7,7
db 3
db 2,4, 4,8, 8,2, -1,-1
db 3
db 3,7, 7,9, 9,3, -1,-1
db 4
db 4,8, 6,10, 8,4, 10,6
db 3
db 5,7, 7,11, 11,5, -1,-1
db 3
db 6,10, 10,12, 12,6, -1,-1
db 4
db 7,9, 9,7, 11,13, 13,11
db 3
db 8,10, 10,14, 14,8, -1,-1
db 4
db 9,13, 13,9, 9,-1, 13,-1
db 3
db 10,12, 12,14, 14,10, -1,-1
db 4
db 11,13, 13,11, 11,-1, 13,-1
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