153 lines
4.2 KiB
Python
153 lines
4.2 KiB
Python
from ..assembler import ASM
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def fixShop(rom):
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# Move shield visuals to the 2nd slot, and arrow to 3th slot
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rom.patch(0x04, 0x3732 + 22, "986A027FB2B098AC01BAB1", "9867027FB2B098A801BAB1")
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rom.patch(0x04, 0x3732 + 55, "986302B1B07F98A4010A09", "986B02B1B07F98AC010A09")
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# Just use a fixed location in memory to store which inventory we give.
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rom.patch(0x04, 0x37C5, "0708", "0802")
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# Patch the code that decides which shop to show.
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rom.patch(0x04, 0x3839, 0x388E, ASM("""
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push bc
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jr skipSubRoutine
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checkInventory:
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ld hl, $DB00 ; inventory
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ld c, INV_SIZE
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loop:
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cp [hl]
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ret z
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inc hl
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dec c
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jr nz, loop
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and a
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ret
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skipSubRoutine:
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; Set the shop table to all nothing.
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ld hl, $C505
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xor a
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ldi [hl], a
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ldi [hl], a
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ldi [hl], a
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ldi [hl], a
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ld de, $C505
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; Check if we want to load a key item into the shop.
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ldh a, [$F8]
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bit 4, a
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jr nz, checkForSecondKeyItem
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ld a, $01
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ld [de], a
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jr checkForShield
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checkForSecondKeyItem:
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bit 5, a
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jr nz, checkForShield
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ld a, $05
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ld [de], a
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checkForShield:
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inc de
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; Check if we have the shield or the bow to see if we need to remove certain entries from the shop
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ld a, [$DB44]
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and a
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jr z, hasNoShieldLevel
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ld a, $03
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ld [de], a ; Add shield buy option
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hasNoShieldLevel:
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inc de
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ld a, $05
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call checkInventory
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jr nz, hasNoBow
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ld a, $06
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ld [de], a ; Add arrow buy option
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hasNoBow:
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inc de
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ld a, $02
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call checkInventory
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jr nz, hasNoBombs
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ld a, $04
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ld [de], a ; Add bomb buy option
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hasNoBombs:
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pop bc
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call $3B12 ; increase entity state
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""", 0x7839), fill_nop=True)
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# We do not have enough room at the shovel/bow buy entry to handle this
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# So jump to a bit where we have some more space to work, as there is some dead code in the shop.
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rom.patch(0x04, 0x3AA9, 0x3AAE, ASM("jp $7AC3"), fill_nop=True)
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# Patch over the "you stole it" dialog
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rom.patch(0x00, 0x1A1C, 0x1A21, ASM("""ld a, $C9
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call $2385"""), fill_nop=True)
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rom.patch(0x04, 0x3AC3, 0x3AD8, ASM("""
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; No room override needed, we're in the proper room
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; Call our chest item giving code.
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ld a, $0E
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rst 8
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; Update the room status to mark first item as bought
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ld hl, $DAA1
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ld a, [hl]
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or $10
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ld [hl], a
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ret
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"""), fill_nop=True)
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rom.patch(0x04, 0x3A73, 0x3A7E, ASM("jp $7A91"), fill_nop=True)
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rom.patch(0x04, 0x3A91, 0x3AA9, ASM("""
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; Override the room - luckily nothing will go wrong here if we leave it as is
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ld a, $A7
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ldh [$F6], a
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; Call our chest item giving code.
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ld a, $0E
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rst 8
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; Update the room status to mark second item as bought
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ld hl, $DAA1
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ld a, [hl]
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or $20
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ld [hl], a
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ret
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"""), fill_nop=True)
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# Patch shop item graphics rendering to use some new code at the end of the bank.
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rom.patch(0x04, 0x3B91, 0x3BAC, ASM("""
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call $7FD0
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"""), fill_nop=True)
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rom.patch(0x04, 0x3BD3, 0x3BE3, ASM("""
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jp $7FD0
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"""), fill_nop=True)
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rom.patch(0x04, 0x3FD0, "00" * 42, ASM("""
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; Check if first key item
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and a
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jr nz, notShovel
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ld a, [$77C5]
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ldh [$F1], a
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ld a, $01
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rst 8
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ret
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notShovel:
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cp $04
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jr nz, notBow
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ld a, [$77C6]
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ldh [$F1], a
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ld a, $01
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rst 8
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ret
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notBow:
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cp $05
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jr nz, notArrows
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; Load arrow graphics and render then as a dual sprite
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ld de, $7B58
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call $3BC0
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ret
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notArrows:
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; Load the normal graphics
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ld de, $7B5A
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jp $3C77
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"""), fill_nop=True)
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