From f11e353fbb7d08f33ac58b49f586f65fb800cfba Mon Sep 17 00:00:00 2001
From: Pokeglitch <pokeglitchx@gmail.com>
Date: Sat, 16 Jun 2018 10:24:17 -0400
Subject: More Bank 3 routines

---
 engine/items/inventory.asm    | 46 +++++++++++++++++++++++++
 engine/items/item_effects.asm | 79 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 125 insertions(+)
 create mode 100755 engine/items/item_effects.asm

(limited to 'engine/items')

diff --git a/engine/items/inventory.asm b/engine/items/inventory.asm
index 9c5a1ec..729ba45 100755
--- a/engine/items/inventory.asm
+++ b/engine/items/inventory.asm
@@ -587,6 +587,52 @@ GetNumberedTMHM: ; 03:4D1A
 .not_machine
 	and a
 	ret
+
+SECTION "GetItemAmount", ROMX[$4e10], BANK[$03]
+
+; Returns carry if user has the item
+; and the amount in b
+GetItemAmount: ; 03:4e10
+	call CheckAmountInItemPocket
+	ret c
+	call CheckAmountInKeyItems
+	ret c
+	ld b, 0
+	and a
+	ret
+	
+; Returns the amount of item b in b
+CheckAmountInItemPocket: ; 03:4E1C
+	ld hl, wItems
+.loop
+	inc hl
+	ld a, [hli]
+	cp -1
+	ret z
+	cp b
+	jr nz, .loop
+
+	ld a, [hl]
+	ld b, a
+	scf
+	ret
+
+; Returns the amount of item b in b
+CheckAmountInKeyItems: ; 03:4E2B
+	ld hl, wNumKeyItems
+	ld a, [hli]
+	and a
+	ret z
+
+.loop
+	ld a, [hli]
+	cp -1
+	ret z
+	cp b
+	jr nz, .loop
+	ld b, 1
+	scf
+	ret
 	
 SECTION "_CheckTossableItem", ROMX[$53AD], BANK[$03]
 
diff --git a/engine/items/item_effects.asm b/engine/items/item_effects.asm
new file mode 100755
index 0000000..4ee9f42
--- /dev/null
+++ b/engine/items/item_effects.asm
@@ -0,0 +1,79 @@
+INCLUDE "constants.asm"
+
+SECTION "ApplyPPUp", ROMX[$78f6], BANK[$03]
+
+ApplyPPUp: ; 03:78f6
+	ld a, MON_MOVES
+	call GetPartyParamLocation
+	push hl
+	ld de, wStringBuffer1
+	predef FillPP
+	pop hl
+	ld c, MON_PP - MON_MOVES
+	ld b, 0
+	add hl, bc
+	ld de, wStringBuffer1 + 1
+	ld b, 0
+.loop
+	inc b
+	ld a, b
+	cp NUM_MOVES + 1
+	ret z
+	ld a, [wce37]
+	dec a
+	jr nz, .use
+	ld a, [wMenuCursorY]
+	inc a
+	cp b
+	jr nz, .skip
+.use
+	ld a, [hl]
+	and PP_UP_MASK
+	call nz, ComputeMaxPP
+.skip
+	inc hl
+	inc de
+	jr .loop
+
+ComputeMaxPP: ; 03:792B
+	push bc
+	; Divide the base PP by 5.
+	ld a, [de]
+	ldh [hDividend + 3], a
+	xor a
+	ldh [hDividend], a
+	ldh [hDividend + 1], a
+	ldh [hDividend + 2], a
+	ld a, 5
+	ldh [hDivisor], a
+	ld b, 4
+	call Divide
+	; Get the number of PP, which are bits 6 and 7 of the PP value stored in RAM.
+	ld a, [hl]
+	ld b, a
+	swap a
+	and $f
+	srl a
+	srl a
+	ld c, a
+.loop
+	; Normally, a move with 40 PP would have 64 PP with three PP Ups.
+	; Since this would overflow into bit 6, we prevent that from happening
+	; by decreasing the extra amount of PP each PP Up provides, resulting
+	; in a maximum of 61.
+	ldh a, [hQuotient + 2]
+	cp $8
+	jr c, .okay
+	ld a, $7
+.okay
+	add b
+	ld b, a
+	ld a, [wce37]
+	dec a
+	jr z, .no_pp_up
+	dec c
+	jr nz, .loop
+.no_pp_up
+	ld [hl], b
+	pop bc
+	ret
\ No newline at end of file
-- 
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