ref: b2369b0961add3a7b7475870df4e46566903dd8b
dir: /engine/events/hidden_objects/vermilion_gym_trash.asm/
PrintTrashText: call EnableAutoTextBoxDrawing tx_pre_jump VermilionGymTrashText VermilionGymTrashText:: text_far _VermilionGymTrashText text_end GymTrashScript: call EnableAutoTextBoxDrawing ld a, [wHiddenObjectFunctionArgument] ld [wGymTrashCanIndex], a ; Don't do the trash can puzzle if it's already been done. CheckEvent EVENT_2ND_LOCK_OPENED jr z, .ok tx_pre_jump VermilionGymTrashText .ok CheckEventReuseA EVENT_1ST_LOCK_OPENED jr nz, .trySecondLock ld a, [wFirstLockTrashCanIndex] ld b, a ld a, [wGymTrashCanIndex] cp b jr z, .openFirstLock tx_pre_id VermilionGymTrashText jr .done .openFirstLock ; Next can is trying for the second switch. SetEvent EVENT_1ST_LOCK_OPENED ld hl, GymTrashCans ld a, [wGymTrashCanIndex] ; * 5 ld b, a add a add a add b ld d, 0 ld e, a add hl, de ld a, [hli] ; There is a bug in this code. It should calculate a value in the range [0, 3] ; but if the mask and random number don't have any 1 bits in common, then ; the result of the AND will be 0. When 1 is subtracted from that, the value ; will become $ff. This will result in 255 being added to hl, which will cause ; hl to point to one of the zero bytes that pad the end of the ROM bank. ; Trash can 0 was intended to be able to have the second lock only when the ; first lock was in trash can 1 or 3. However, due to this bug, trash can 0 can ; have the second lock regardless of which trash can had the first lock. ld [hGymTrashCanRandNumMask], a push hl call Random swap a ld b, a ld a, [hGymTrashCanRandNumMask] and b dec a pop hl ld d, 0 ld e, a add hl, de ld a, [hl] and $f ld [wSecondLockTrashCanIndex], a tx_pre_id VermilionGymTrashSuccessText1 jr .done .trySecondLock ld a, [wSecondLockTrashCanIndex] ld b, a ld a, [wGymTrashCanIndex] cp b jr z, .openSecondLock ; Reset the cans. ResetEvent EVENT_1ST_LOCK_OPENED call Random and $e ld [wFirstLockTrashCanIndex], a tx_pre_id VermilionGymTrashFailText jr .done .openSecondLock ; Completed the trash can puzzle. SetEvent EVENT_2ND_LOCK_OPENED ld hl, wCurrentMapScriptFlags set 6, [hl] tx_pre_id VermilionGymTrashSuccessText3 .done jp PrintPredefTextID GymTrashCans: ; byte 0: mask for random number ; bytes 1-4: indices of the trash cans that can have the second lock ; (but see the comment above explaining a bug regarding this) ; Note that the mask is simply the number of valid trash can indices that ; follow. The remaining bytes are filled with 0 to pad the length of each entry ; to 5 bytes. db 2, 1, 3, 0, 0 ; 0 db 3, 0, 2, 4, 0 ; 1 db 2, 1, 5, 0, 0 ; 2 db 3, 0, 4, 6, 0 ; 3 db 4, 1, 3, 5, 7 ; 4 db 3, 2, 4, 8, 0 ; 5 db 3, 3, 7, 9, 0 ; 6 db 4, 4, 6, 8, 10 ; 7 db 3, 5, 7, 11, 0 ; 8 db 3, 6, 10, 12, 0 ; 9 db 4, 7, 9, 11, 13 ; 10 db 3, 8, 10, 14, 0 ; 11 db 2, 9, 13, 0, 0 ; 12 db 3, 10, 12, 14, 0 ; 13 db 2, 11, 13, 0, 0 ; 14 VermilionGymTrashSuccessText1:: text_far _VermilionGymTrashSuccessText1 text_asm call WaitForSoundToFinish ld a, SFX_SWITCH call PlaySound call WaitForSoundToFinish jp TextScriptEnd ; unused VermilionGymTrashSuccessText2:: text_far _VermilionGymTrashSuccessText2 text_end ; unused VermilionGymTrashSuccesPlaySfx: text_asm call WaitForSoundToFinish ld a, SFX_SWITCH call PlaySound call WaitForSoundToFinish jp TextScriptEnd VermilionGymTrashSuccessText3:: text_far _VermilionGymTrashSuccessText3 text_asm call WaitForSoundToFinish ld a, SFX_GO_INSIDE call PlaySound call WaitForSoundToFinish jp TextScriptEnd VermilionGymTrashFailText:: text_far _VermilionGymTrashFailText text_asm call WaitForSoundToFinish ld a, SFX_DENIED call PlaySound call WaitForSoundToFinish jp TextScriptEnd