1 files changed, 513 insertions, 0 deletions
diff --git a/engine/pokemon/evos_moves.asm b/engine/pokemon/evos_moves.asm
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+++ b/engine/pokemon/evos_moves.asm
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+; try to evolve the mon in [wWhichPokemon]
+TryEvolvingMon:
+	ld hl, wCanEvolveFlags
+	xor a
+	ld [hl], a
+	ld a, [wWhichPokemon]
+	ld c, a
+	ld b, FLAG_SET
+	call Evolution_FlagAction
+
+; this is only called after battle
+; it is supposed to do level up evolutions, though there is a bug that allows item evolutions to occur
+EvolutionAfterBattle:
+	ld a, [hTilesetType]
+	push af
+	xor a
+	ld [wEvolutionOccurred], a
+	dec a
+	ld [wWhichPokemon], a
+	push hl
+	push bc
+	push de
+	ld hl, wPartyCount
+	push hl
+
+Evolution_PartyMonLoop: ; loop over party mons
+	ld hl, wWhichPokemon
+	inc [hl]
+	pop hl
+	inc hl
+	ld a, [hl]
+	cp $ff ; have we reached the end of the party?
+	jp z, .done
+	ld [wEvoOldSpecies], a
+	push hl
+	ld a, [wWhichPokemon]
+	ld c, a
+	ld hl, wCanEvolveFlags
+	ld b, FLAG_TEST
+	call Evolution_FlagAction
+	ld a, c
+	and a ; is the mon's bit set?
+	jp z, Evolution_PartyMonLoop ; if not, go to the next mon
+	ld a, [wEvoOldSpecies]
+	dec a
+	ld b, 0
+	ld hl, EvosMovesPointerTable
+	add a
+	rl b
+	ld c, a
+	add hl, bc
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	push hl
+	ld a, [wcf91]
+	push af
+	xor a ; PLAYER_PARTY_DATA
+	ld [wMonDataLocation], a
+	call LoadMonData
+	pop af
+	ld [wcf91], a
+	pop hl
+
+.evoEntryLoop ; loop over evolution entries
+	ld a, [hli]
+	and a ; have we reached the end of the evolution data?
+	jr z, Evolution_PartyMonLoop
+	ld b, a ; evolution type
+	cp EV_TRADE
+	jr z, .checkTradeEvo
+; not trade evolution
+	ld a, [wLinkState]
+	cp LINK_STATE_TRADING
+	jr z, Evolution_PartyMonLoop ; if trading, go the next mon
+	ld a, b
+	cp EV_ITEM
+	jr z, .checkItemEvo
+	ld a, [wForceEvolution]
+	and a
+	jr nz, Evolution_PartyMonLoop
+	ld a, b
+	cp EV_LEVEL
+	jr z, .checkLevel
+.checkTradeEvo
+	ld a, [wLinkState]
+	cp LINK_STATE_TRADING
+	jp nz, .nextEvoEntry1 ; if not trading, go to the next evolution entry
+	ld a, [hli] ; level requirement
+	ld b, a
+	ld a, [wLoadedMonLevel]
+	cp b ; is the mon's level greater than the evolution requirement?
+	jp c, Evolution_PartyMonLoop ; if so, go the next mon
+	jr .doEvolution
+.checkItemEvo
+	ld a, [hli]
+	ld b, a ; evolution item
+	ld a, [wcf91] ; this is supposed to be the last item used, but it is also used to hold species numbers
+	cp b ; was the evolution item in this entry used?
+	jp nz, .nextEvoEntry1 ; if not, go to the next evolution entry
+.checkLevel
+	ld a, [hli] ; level requirement
+	ld b, a
+	ld a, [wLoadedMonLevel]
+	cp b ; is the mon's level greater than the evolution requirement?
+	jp c, .nextEvoEntry2 ; if so, go the next evolution entry
+.doEvolution
+	ld [wCurEnemyLVL], a
+	ld a, 1
+	ld [wEvolutionOccurred], a
+	push hl
+	ld a, [hl]
+	ld [wEvoNewSpecies], a
+	ld a, [wWhichPokemon]
+	ld hl, wPartyMonNicks
+	call GetPartyMonName
+	call CopyStringToCF4B
+	ld hl, IsEvolvingText
+	call PrintText
+	ld c, 50
+	call DelayFrames
+	xor a
+	ld [H_AUTOBGTRANSFERENABLED], a
+	coord hl, 0, 0
+	lb bc, 12, 20
+	call ClearScreenArea
+	ld a, $1
+	ld [H_AUTOBGTRANSFERENABLED], a
+	ld a, $ff
+	ld [wUpdateSpritesEnabled], a
+	call ClearSprites
+	callab EvolveMon
+	jp c, CancelledEvolution
+	ld hl, EvolvedText
+	call PrintText
+	pop hl
+	ld a, [hl]
+	ld [wd0b5], a
+	ld [wLoadedMonSpecies], a
+	ld [wEvoNewSpecies], a
+	ld a, MONSTER_NAME
+	ld [wNameListType], a
+	ld a, BANK(TrainerNames) ; bank is not used for monster names
+	ld [wPredefBank], a
+	call GetName
+	push hl
+	ld hl, IntoText
+	call PrintText_NoCreatingTextBox
+	ld a, SFX_GET_ITEM_2
+	call PlaySoundWaitForCurrent
+	call WaitForSoundToFinish
+	ld c, 40
+	call DelayFrames
+	call ClearScreen
+	call RenameEvolvedMon
+	ld a, [wd11e]
+	push af
+	ld a, [wd0b5]
+	ld [wd11e], a
+	predef IndexToPokedex
+	ld a, [wd11e]
+	dec a
+	ld hl, BaseStats
+	ld bc, MonBaseStatsEnd - MonBaseStats
+	call AddNTimes
+	ld de, wMonHeader
+	call CopyData
+	ld a, [wd0b5]
+	ld [wMonHIndex], a
+	pop af
+	ld [wd11e], a
+	ld hl, wLoadedMonHPExp - 1
+	ld de, wLoadedMonStats
+	ld b, $1
+	call CalcStats
+	ld a, [wWhichPokemon]
+	ld hl, wPartyMon1
+	ld bc, wPartyMon2 - wPartyMon1
+	call AddNTimes
+	ld e, l
+	ld d, h
+	push hl
+	push bc
+	ld bc, wPartyMon1MaxHP - wPartyMon1
+	add hl, bc
+	ld a, [hli]
+	ld b, a
+	ld c, [hl]
+	ld hl, wLoadedMonMaxHP + 1
+	ld a, [hld]
+	sub c
+	ld c, a
+	ld a, [hl]
+	sbc b
+	ld b, a
+	ld hl, wLoadedMonHP + 1
+	ld a, [hl]
+	add c
+	ld [hld], a
+	ld a, [hl]
+	adc b
+	ld [hl], a
+	dec hl
+	pop bc
+	call CopyData
+	ld a, [wd0b5]
+	ld [wd11e], a
+	xor a
+	ld [wMonDataLocation], a
+	call LearnMoveFromLevelUp
+	pop hl
+	predef SetPartyMonTypes
+	ld a, [wIsInBattle]
+	and a
+	call z, Evolution_ReloadTilesetTilePatterns
+	predef IndexToPokedex
+	ld a, [wd11e]
+	dec a
+	ld c, a
+	ld b, FLAG_SET
+	ld hl, wPokedexOwned
+	push bc
+	call Evolution_FlagAction
+	pop bc
+	ld hl, wPokedexSeen
+	call Evolution_FlagAction
+	pop de
+	pop hl
+	ld a, [wLoadedMonSpecies]
+	ld [hl], a
+	push hl
+	ld l, e
+	ld h, d
+	jr .nextEvoEntry2
+
+.nextEvoEntry1
+	inc hl
+
+.nextEvoEntry2
+	inc hl
+	jp .evoEntryLoop
+
+.done
+	pop de
+	pop bc
+	pop hl
+	pop af
+	ld [hTilesetType], a
+	ld a, [wLinkState]
+	cp LINK_STATE_TRADING
+	ret z
+	ld a, [wIsInBattle]
+	and a
+	ret nz
+	ld a, [wEvolutionOccurred]
+	and a
+	call nz, PlayDefaultMusic
+	ret
+
+RenameEvolvedMon:
+; Renames the mon to its new, evolved form's standard name unless it had a
+; nickname, in which case the nickname is kept.
+	ld a, [wd0b5]
+	push af
+	ld a, [wMonHIndex]
+	ld [wd0b5], a
+	call GetName
+	pop af
+	ld [wd0b5], a
+	ld hl, wcd6d
+	ld de, wcf4b
+.compareNamesLoop
+	ld a, [de]
+	inc de
+	cp [hl]
+	inc hl
+	ret nz
+	cp "@"
+	jr nz, .compareNamesLoop
+	ld a, [wWhichPokemon]
+	ld bc, NAME_LENGTH
+	ld hl, wPartyMonNicks
+	call AddNTimes
+	push hl
+	call GetName
+	ld hl, wcd6d
+	pop de
+	jp CopyData
+
+CancelledEvolution:
+	ld hl, StoppedEvolvingText
+	call PrintText
+	call ClearScreen
+	pop hl
+	call Evolution_ReloadTilesetTilePatterns
+	jp Evolution_PartyMonLoop
+
+EvolvedText:
+	TX_FAR _EvolvedText
+	db "@"
+
+IntoText:
+	TX_FAR _IntoText
+	db "@"
+
+StoppedEvolvingText:
+	TX_FAR _StoppedEvolvingText
+	db "@"
+
+IsEvolvingText:
+	TX_FAR _IsEvolvingText
+	db "@"
+
+Evolution_ReloadTilesetTilePatterns:
+	ld a, [wLinkState]
+	cp LINK_STATE_TRADING
+	ret z
+	jp ReloadTilesetTilePatterns
+
+LearnMoveFromLevelUp:
+	ld hl, EvosMovesPointerTable
+	ld a, [wd11e] ; species
+	ld [wcf91], a
+	dec a
+	ld bc, 0
+	ld hl, EvosMovesPointerTable
+	add a
+	rl b
+	ld c, a
+	add hl, bc
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+.skipEvolutionDataLoop ; loop to skip past the evolution data, which comes before the move data
+	ld a, [hli]
+	and a ; have we reached the end of the evolution data?
+	jr nz, .skipEvolutionDataLoop ; if not, jump back up
+.learnSetLoop ; loop over the learn set until we reach a move that is learnt at the current level or the end of the list
+	ld a, [hli]
+	and a ; have we reached the end of the learn set?
+	jr z, .done ; if we've reached the end of the learn set, jump
+	ld b, a ; level the move is learnt at
+	ld a, [wCurEnemyLVL]
+	cp b ; is the move learnt at the mon's current level?
+	ld a, [hli] ; move ID
+	jr nz, .learnSetLoop
+	ld d, a ; ID of move to learn
+	ld a, [wMonDataLocation]
+	and a
+	jr nz, .next
+; If [wMonDataLocation] is 0 (PLAYER_PARTY_DATA), get the address of the mon's
+; current moves in party data. Every call to this function sets
+; [wMonDataLocation] to 0 because other data locations are not supported.
+; If it is not 0, this function will not work properly.
+	ld hl, wPartyMon1Moves
+	ld a, [wWhichPokemon]
+	ld bc, wPartyMon2 - wPartyMon1
+	call AddNTimes
+.next
+	ld b, NUM_MOVES
+.checkCurrentMovesLoop ; check if the move to learn is already known
+	ld a, [hli]
+	cp d
+	jr z, .done ; if already known, jump
+	dec b
+	jr nz, .checkCurrentMovesLoop
+	ld a, d
+	ld [wMoveNum], a
+	ld [wd11e], a
+	call GetMoveName
+	call CopyStringToCF4B
+	predef LearnMove
+.done
+	ld a, [wcf91]
+	ld [wd11e], a
+	ret
+
+; writes the moves a mon has at level [wCurEnemyLVL] to [de]
+; move slots are being filled up sequentially and shifted if all slots are full
+WriteMonMoves:
+	call GetPredefRegisters
+	push hl
+	push de
+	push bc
+	ld hl, EvosMovesPointerTable
+	ld b, 0
+	ld a, [wcf91]  ; cur mon ID
+	dec a
+	add a
+	rl b
+	ld c, a
+	add hl, bc
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+.skipEvoEntriesLoop
+	ld a, [hli]
+	and a
+	jr nz, .skipEvoEntriesLoop
+	jr .firstMove
+.nextMove
+	pop de
+.nextMove2
+	inc hl
+.firstMove
+	ld a, [hli]       ; read level of next move in learnset
+	and a
+	jp z, .done       ; end of list
+	ld b, a
+	ld a, [wCurEnemyLVL]
+	cp b
+	jp c, .done       ; mon level < move level (assumption: learnset is sorted by level)
+	ld a, [wLearningMovesFromDayCare]
+	and a
+	jr z, .skipMinLevelCheck
+	ld a, [wDayCareStartLevel]
+	cp b
+	jr nc, .nextMove2 ; min level >= move level
+
+.skipMinLevelCheck
+
+; check if the move is already known
+	push de
+	ld c, NUM_MOVES
+.alreadyKnowsCheckLoop
+	ld a, [de]
+	inc de
+	cp [hl]
+	jr z, .nextMove
+	dec c
+	jr nz, .alreadyKnowsCheckLoop
+
+; try to find an empty move slot
+	pop de
+	push de
+	ld c, NUM_MOVES
+.findEmptySlotLoop
+	ld a, [de]
+	and a
+	jr z, .writeMoveToSlot2
+	inc de
+	dec c
+	jr nz, .findEmptySlotLoop
+
+; no empty move slots found
+	pop de
+	push de
+	push hl
+	ld h, d
+	ld l, e
+	call WriteMonMoves_ShiftMoveData ; shift all moves one up (deleting move 1)
+	ld a, [wLearningMovesFromDayCare]
+	and a
+	jr z, .writeMoveToSlot
+
+; shift PP as well if learning moves from day care
+	push de
+	ld bc, wPartyMon1PP - (wPartyMon1Moves + 3)
+	add hl, bc
+	ld d, h
+	ld e, l
+	call WriteMonMoves_ShiftMoveData ; shift all move PP data one up
+	pop de
+
+.writeMoveToSlot
+	pop hl
+.writeMoveToSlot2
+	ld a, [hl]
+	ld [de], a
+	ld a, [wLearningMovesFromDayCare]
+	and a
+	jr z, .nextMove
+
+; write move PP value if learning moves from day care
+	push hl
+	ld a, [hl]
+	ld hl, wPartyMon1PP - wPartyMon1Moves
+	add hl, de
+	push hl
+	dec a
+	ld hl, Moves
+	ld bc, MoveEnd - Moves
+	call AddNTimes
+	ld de, wBuffer
+	ld a, BANK(Moves)
+	call FarCopyData
+	ld a, [wBuffer + 5]
+	pop hl
+	ld [hl], a
+	pop hl
+	jr .nextMove
+
+.done
+	pop bc
+	pop de
+	pop hl
+	ret
+
+; shifts all move data one up (freeing 4th move slot)
+WriteMonMoves_ShiftMoveData:
+	ld c, NUM_MOVES - 1
+.loop
+	inc de
+	ld a, [de]
+	ld [hli], a
+	dec c
+	jr nz, .loop
+	ret
+
+Evolution_FlagAction:
+	predef_jump FlagActionPredef
+
+INCLUDE "data/evos_moves.asm"