ref: b8fc67848e1d5911204fa42bbd9b954fdec6228a
dir: /engine/items/items.asm/
_ReceiveItem:: call DoesHLEqualNumItems jp nz, PutItemInPocket push hl call CheckItemPocket pop de ld a, [wItemAttributeValue] dec a ld hl, .Pockets rst JumpTable ret .Pockets: ; entries correspond to item types dw .Item dw .KeyItem dw .Ball dw .TMHM .Item: ld h, d ld l, e jp PutItemInPocket .KeyItem: ld h, d ld l, e jp ReceiveKeyItem .Ball: ld hl, wNumBalls jp PutItemInPocket .TMHM: ld h, d ld l, e ld a, [wCurItem] ld c, a call GetTMHMNumber jp ReceiveTMHM _TossItem:: call DoesHLEqualNumItems jr nz, .remove push hl call CheckItemPocket pop de ld a, [wItemAttributeValue] dec a ld hl, .Pockets rst JumpTable ret .Pockets: ; entries correspond to item types dw .Item dw .KeyItem dw .Ball dw .TMHM .Ball: ld hl, wNumBalls jp RemoveItemFromPocket .TMHM: ld h, d ld l, e ld a, [wCurItem] ld c, a call GetTMHMNumber jp TossTMHM .KeyItem: ld h, d ld l, e jp TossKeyItem .Item: ld h, d ld l, e .remove jp RemoveItemFromPocket _CheckItem:: call DoesHLEqualNumItems jr nz, .nope push hl call CheckItemPocket pop de ld a, [wItemAttributeValue] dec a ld hl, .Pockets rst JumpTable ret .Pockets: ; entries correspond to item types dw .Item dw .KeyItem dw .Ball dw .TMHM .Ball: ld hl, wNumBalls jp CheckTheItem .TMHM: ld h, d ld l, e ld a, [wCurItem] ld c, a call GetTMHMNumber jp CheckTMHM .KeyItem: ld h, d ld l, e jp CheckKeyItems .Item: ld h, d ld l, e .nope jp CheckTheItem DoesHLEqualNumItems: ld a, l cp LOW(wNumItems) ret nz ld a, h cp HIGH(wNumItems) ret GetPocketCapacity: ld c, MAX_ITEMS ld a, e cp LOW(wNumItems) jr nz, .not_bag ld a, d cp HIGH(wNumItems) ret z .not_bag ld c, MAX_PC_ITEMS ld a, e cp LOW(wNumPCItems) jr nz, .not_pc ld a, d cp HIGH(wNumPCItems) ret z .not_pc ld c, MAX_BALLS ret PutItemInPocket: ld d, h ld e, l inc hl ld a, [wCurItem] ld c, a ld b, 0 .loop ld a, [hli] cp -1 jr z, .terminator cp c jr nz, .next ld a, MAX_ITEM_STACK sub [hl] add b ld b, a ld a, [wItemQuantityChange] cp b jr z, .ok jr c, .ok .next inc hl jr .loop .terminator call GetPocketCapacity ld a, [de] cp c jr c, .ok and a ret .ok ld h, d ld l, e ld a, [wCurItem] ld c, a ld a, [wItemQuantityChange] ld [wItemQuantity], a .loop2 inc hl ld a, [hli] cp -1 jr z, .terminator2 cp c jr nz, .loop2 ld a, [wItemQuantity] add [hl] cp MAX_ITEM_STACK + 1 jr nc, .newstack ld [hl], a jr .done .newstack ld [hl], MAX_ITEM_STACK sub MAX_ITEM_STACK ld [wItemQuantity], a jr .loop2 .terminator2 dec hl ld a, [wCurItem] ld [hli], a ld a, [wItemQuantity] ld [hli], a ld [hl], -1 ld h, d ld l, e inc [hl] .done scf ret RemoveItemFromPocket: ld d, h ld e, l ld a, [hli] ld c, a ld a, [wCurItemQuantity] cp c jr nc, .ok ; memory ld c, a ld b, 0 add hl, bc add hl, bc ld a, [wCurItem] cp [hl] inc hl jr z, .skip ld h, d ld l, e inc hl .ok ld a, [wCurItem] ld b, a .loop ld a, [hli] cp b jr z, .skip cp -1 jr z, .nope inc hl jr .loop .skip ld a, [wItemQuantityChange] ld b, a ld a, [hl] sub b jr c, .nope ld [hl], a ld [wItemQuantity], a and a jr nz, .yup dec hl ld b, h ld c, l inc hl inc hl .loop2 ld a, [hli] ld [bc], a inc bc cp -1 jr nz, .loop2 ld h, d ld l, e dec [hl] .yup scf ret .nope and a ret CheckTheItem: ld a, [wCurItem] ld c, a .loop inc hl ld a, [hli] cp -1 jr z, .done cp c jr nz, .loop scf ret .done and a ret ReceiveKeyItem: ld hl, wNumKeyItems ld a, [hli] cp MAX_KEY_ITEMS jr nc, .nope ld c, a ld b, 0 add hl, bc ld a, [wCurItem] ld [hli], a ld [hl], -1 ld hl, wNumKeyItems inc [hl] scf ret .nope and a ret TossKeyItem: ld a, [wCurItemQuantity] ld e, a ld d, 0 ld hl, wNumKeyItems ld a, [hl] cp e jr nc, .ok call .Toss ret nc jr .ok2 .ok dec [hl] inc hl add hl, de .ok2 ld d, h ld e, l inc hl .loop ld a, [hli] ld [de], a inc de cp -1 jr nz, .loop scf ret .Toss: ld hl, wNumKeyItems ld a, [wCurItem] ld c, a .loop3 inc hl ld a, [hl] cp c jr z, .ok3 cp -1 jr nz, .loop3 xor a ret .ok3 ld a, [wNumKeyItems] dec a ld [wNumKeyItems], a scf ret CheckKeyItems: ld a, [wCurItem] ld c, a ld hl, wKeyItems .loop ld a, [hli] cp c jr z, .done cp -1 jr nz, .loop and a ret .done scf ret ReceiveTMHM: dec c ld b, 0 ld hl, wTMsHMs add hl, bc ld a, [wItemQuantityChange] add [hl] cp MAX_ITEM_STACK + 1 jr nc, .toomany ld [hl], a scf ret .toomany and a ret TossTMHM: dec c ld b, 0 ld hl, wTMsHMs add hl, bc ld a, [wItemQuantityChange] ld b, a ld a, [hl] sub b jr c, .nope ld [hl], a ld [wItemQuantity], a jr nz, .yup ld a, [wTMHMPocketScrollPosition] and a jr z, .yup dec a ld [wTMHMPocketScrollPosition], a .yup scf ret .nope and a ret CheckTMHM: dec c ld b, $0 ld hl, wTMsHMs add hl, bc ld a, [hl] and a ret z scf ret GetTMHMNumber:: ; Return the number of a TM/HM by item id c. ld a, c ; Skip any dummy items. cp ITEM_C3 ; TM04-05 jr c, .done cp ITEM_DC ; TM28-29 jr c, .skip dec a .skip dec a .done sub TM01 inc a ld c, a ret GetNumberedTMHM: ; Return the item id of a TM/HM by number c. ld a, c ; Skip any gaps. cp ITEM_C3 - (TM01 - 1) jr c, .done cp ITEM_DC - (TM01 - 1) - 1 jr c, .skip_one ; skip two inc a .skip_one inc a .done add TM01 dec a ld c, a ret _CheckTossableItem:: ; Return 1 in wItemAttributeValue and carry if wCurItem can't be removed from the bag. ld a, ITEMATTR_PERMISSIONS call GetItemAttr bit CANT_TOSS_F, a jr nz, ItemAttr_ReturnCarry and a ret CheckSelectableItem: ; Return 1 in wItemAttributeValue and carry if wCurItem can't be selected. ld a, ITEMATTR_PERMISSIONS call GetItemAttr bit CANT_SELECT_F, a jr nz, ItemAttr_ReturnCarry and a ret CheckItemPocket:: ; Return the pocket for wCurItem in wItemAttributeValue. ld a, ITEMATTR_POCKET call GetItemAttr and $f ld [wItemAttributeValue], a ret CheckItemContext: ; Return the context for wCurItem in wItemAttributeValue. ld a, ITEMATTR_HELP call GetItemAttr and $f ld [wItemAttributeValue], a ret CheckItemMenu: ; Return the menu for wCurItem in wItemAttributeValue. ld a, ITEMATTR_HELP call GetItemAttr swap a and $f ld [wItemAttributeValue], a ret GetItemAttr: ; Get attribute a of wCurItem. push hl push bc ld hl, ItemAttributes ld c, a ld b, 0 add hl, bc xor a ld [wItemAttributeValue], a ld a, [wCurItem] dec a ld c, a ld a, ITEMATTR_STRUCT_LENGTH call AddNTimes ld a, BANK(ItemAttributes) call GetFarByte pop bc pop hl ret ItemAttr_ReturnCarry: ld a, 1 ld [wItemAttributeValue], a scf ret GetItemPrice: ; Return the price of wCurItem in de. push hl push bc ld a, ITEMATTR_PRICE_LO call GetItemAttr ld e, a ld a, ITEMATTR_PRICE_HI call GetItemAttr ld d, a pop bc pop hl ret