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; checks if the player's coordinates match an arrow movement tile's coordinates
; and if so, decodes the RLE movement data
; b = player Y
; c = player X
DecodeArrowMovementRLE::
ld a, [hli]
cp $ff
ret z ; no match in the list
cp b
jr nz, .nextArrowMovementTileEntry1
ld a, [hli]
cp c
jr nz, .nextArrowMovementTileEntry2
ld a, [hli]
ld d, [hl]
ld e, a
ld hl, wSimulatedJoypadStatesEnd
call DecodeRLEList
dec a
ld [wSimulatedJoypadStatesIndex], a
ret
.nextArrowMovementTileEntry1
inc hl
.nextArrowMovementTileEntry2
inc hl
inc hl
jr DecodeArrowMovementRLE
TextScript_ItemStoragePC::
call SaveScreenTilesToBuffer2
ld b, BANK(PlayerPC)
ld hl, PlayerPC
jr bankswitchAndContinue
TextScript_BillsPC::
call SaveScreenTilesToBuffer2
ld b, BANK(BillsPC_)
ld hl, BillsPC_
jr bankswitchAndContinue
TextScript_GameCornerPrizeMenu::
; XXX find a better name for this function
; special_F7
ld b, BANK(CeladonPrizeMenu)
ld hl, CeladonPrizeMenu
bankswitchAndContinue::
call Bankswitch
jp HoldTextDisplayOpen ; continue to main text-engine function
TextScript_PokemonCenterPC::
ld b, BANK(ActivatePC)
ld hl, ActivatePC
jr bankswitchAndContinue
StartSimulatingJoypadStates::
xor a
ld [wOverrideSimulatedJoypadStatesMask], a
ld [wSpritePlayerStateData2MovementByte1], a
ld hl, wd730
set 7, [hl]
ret
IsItemInBag::
; given an item_id in b
; set zero flag if item isn't in player's bag
; else reset zero flag
; related to Pokémon Tower and ghosts
predef GetQuantityOfItemInBag
ld a, b
and a
ret
DisplayPokedex::
ld [wd11e], a
farjp _DisplayPokedex
SetSpriteFacingDirectionAndDelay::
call SetSpriteFacingDirection
ld c, 6
jp DelayFrames
SetSpriteFacingDirection::
ld a, SPRITESTATEDATA1_FACINGDIRECTION
ldh [hSpriteDataOffset], a
call GetPointerWithinSpriteStateData1
ldh a, [hSpriteFacingDirection]
ld [hl], a
ret
SetSpriteImageIndexAfterSettingFacingDirection::
ld de, SPRITESTATEDATA1_IMAGEINDEX - SPRITESTATEDATA1_FACINGDIRECTION
add hl, de
ld [hl], a
ret
; tests if the player's coordinates are in a specified array
; INPUT:
; hl = address of array
; OUTPUT:
; [wCoordIndex] = if there is match, the matching array index
; sets carry if the coordinates are in the array, clears carry if not
ArePlayerCoordsInArray::
ld a, [wYCoord]
ld b, a
ld a, [wXCoord]
ld c, a
; fallthrough
CheckCoords::
xor a
ld [wCoordIndex], a
.loop
ld a, [hli]
cp $ff ; reached terminator?
jr z, .notInArray
push hl
ld hl, wCoordIndex
inc [hl]
pop hl
.compareYCoord
cp b
jr z, .compareXCoord
inc hl
jr .loop
.compareXCoord
ld a, [hli]
cp c
jr nz, .loop
.inArray
scf
ret
.notInArray
and a
ret
; tests if a boulder's coordinates are in a specified array
; INPUT:
; hl = address of array
; [hSpriteIndex] = index of boulder sprite
; OUTPUT:
; [wCoordIndex] = if there is match, the matching array index
; sets carry if the coordinates are in the array, clears carry if not
CheckBoulderCoords::
push hl
ld hl, wSpritePlayerStateData2MapY
ldh a, [hSpriteIndex]
swap a
ld d, $0
ld e, a
add hl, de
ld a, [hli]
sub $4 ; because sprite coordinates are offset by 4
ld b, a
ld a, [hl]
sub $4 ; because sprite coordinates are offset by 4
ld c, a
pop hl
jp CheckCoords
GetPointerWithinSpriteStateData1::
ld h, HIGH(wSpriteStateData1)
jr _GetPointerWithinSpriteStateData
GetPointerWithinSpriteStateData2::
ld h, HIGH(wSpriteStateData2)
_GetPointerWithinSpriteStateData:
ldh a, [hSpriteDataOffset]
ld b, a
ldh a, [hSpriteIndex]
swap a
add b
ld l, a
ret
; decodes a $ff-terminated RLEncoded list
; each entry is a pair of bytes <byte value> <repetitions>
; the final $ff will be replicated in the output list and a contains the number of bytes written
; de: input list
; hl: output list
DecodeRLEList::
xor a
ld [wRLEByteCount], a ; count written bytes here
.listLoop
ld a, [de]
cp $ff
jr z, .endOfList
ldh [hRLEByteValue], a ; store byte value to be written
inc de
ld a, [de]
ld b, $0
ld c, a ; number of bytes to be written
ld a, [wRLEByteCount]
add c
ld [wRLEByteCount], a ; update total number of written bytes
ldh a, [hRLEByteValue]
call FillMemory ; write a c-times to output
inc de
jr .listLoop
.endOfList
ld a, $ff
ld [hl], a ; write final $ff
ld a, [wRLEByteCount]
inc a ; include sentinel in counting
ret
; sets movement byte 1 for sprite [hSpriteIndex] to $FE and byte 2 to [hSpriteMovementByte2]
SetSpriteMovementBytesToFE::
push hl
call GetSpriteMovementByte1Pointer
ld [hl], $fe
call GetSpriteMovementByte2Pointer
ldh a, [hSpriteMovementByte2]
ld [hl], a
pop hl
ret
; sets both movement bytes for sprite [hSpriteIndex] to $FF
SetSpriteMovementBytesToFF::
push hl
call GetSpriteMovementByte1Pointer
ld [hl], $FF
call GetSpriteMovementByte2Pointer
ld [hl], $FF ; prevent person from walking?
pop hl
ret
; returns the sprite movement byte 1 pointer for sprite [hSpriteIndex] in hl
GetSpriteMovementByte1Pointer::
ld h, $C2
ldh a, [hSpriteIndex]
swap a
add 6
ld l, a
ret
; returns the sprite movement byte 2 pointer for sprite [hSpriteIndex] in hl
GetSpriteMovementByte2Pointer::
push de
ld hl, wMapSpriteData
ldh a, [hSpriteIndex]
dec a
add a
ld d, 0
ld e, a
add hl, de
pop de
ret
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