pokecrystal-board/engine/events/odd_egg.asm
Rangi eb1e3636bb Use labels instead of constants for HRAM
Use explicit ldh instruction to access HRAM locations, don't rely on optimizing ld
2018-08-25 14:28:22 -04:00

96 lines
1.9 KiB
NASM

_GiveOddEgg:
; Figure out which egg to give.
; Compare a random word to
; probabilities out of 0xffff.
call Random
ld hl, OddEggProbabilities
ld c, 0
ld b, c
.loop
ld a, [hli]
ld e, a
ld a, [hli]
ld d, a
; Break on $ffff.
ld a, d
cp HIGH($ffff)
jr nz, .not_done
ld a, e
cp LOW($ffff)
jr z, .done
.not_done
; Break when [hRandom] <= de.
ldh a, [hRandom + 1]
cp d
jr c, .done
jr z, .ok
jr .next
.ok
ldh a, [hRandom + 0]
cp e
jr c, .done
jr z, .done
.next
inc bc
jr .loop
.done
ld hl, OddEggs
ld a, OddEgg1End - OddEgg1
call AddNTimes
ld de, wOddEggSpecies
ld bc, PARTYMON_STRUCT_LENGTH + 2 * MON_NAME_LENGTH
call CopyBytes
ld a, EGG_TICKET
ld [wCurItem], a
ld a, 1
ld [wItemQuantityChangeBuffer], a
ld a, -1
ld [wCurItemQuantity], a
ld hl, wNumItems
call TossItem
; load species in wcd2a
ld a, EGG
ld [wMobileMonSpeciesBuffer], a
; load pointer to (wMobileMonSpeciesBuffer - 1) in wMobileMonSpeciesPointerBuffer
ld a, LOW(wMobileMonSpeciesBuffer - 1)
ld [wMobileMonSpeciesPointerBuffer], a
ld a, HIGH(wMobileMonSpeciesBuffer - 1)
ld [wMobileMonSpeciesPointerBuffer + 1], a
; load pointer to wOddEggSpecies in wMobileMonStructurePointerBuffer
ld a, LOW(wOddEggSpecies)
ld [wMobileMonStructurePointerBuffer], a
ld a, HIGH(wOddEggSpecies)
ld [wMobileMonStructurePointerBuffer + 1], a
; load Odd Egg Name in wTempOddEggNickname
ld hl, .Odd
ld de, wTempOddEggNickname
ld bc, MON_NAME_LENGTH
call CopyBytes
; load pointer to wTempOddEggNickname in wMobileMonOTNamePointerBuffer
ld a, LOW(wTempOddEggNickname)
ld [wMobileMonOTNamePointerBuffer], a
ld a, HIGH(wTempOddEggNickname)
ld [wMobileMonOTNamePointerBuffer + 1], a
; load pointer to wOddEggName in wMobileMonNicknamePointerBuffer
ld a, LOW(wOddEggName)
ld [wMobileMonNicknamePointerBuffer], a
ld a, HIGH(wOddEggName)
ld [wMobileMonNicknamePointerBuffer + 1], a
farcall AddMobileMonToParty
ret
.Odd:
db "ODD@@@@@@@@@"
INCLUDE "data/events/odd_eggs.asm"