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magnet_train.asm
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magnet_train.asm
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MagnetTrain:
ld a, [wScriptVar]
and a
jr nz, .ToGoldenrod
ld a, 1 ; forwards
lb bc, 8 * TILE_WIDTH, 12 * TILE_WIDTH
lb de, (11 * TILE_WIDTH) - (11 * TILE_WIDTH + 4), -12 * TILE_WIDTH
jr .continue
.ToGoldenrod:
ld a, -1 ; backwards
lb bc, -8 * TILE_WIDTH, -12 * TILE_WIDTH
lb de, (11 * TILE_WIDTH) + (11 * TILE_WIDTH + 4), 12 * TILE_WIDTH
.continue
ld h, a
ldh a, [rSVBK]
push af
ld a, BANK(wMagnetTrain)
ldh [rSVBK], a
ld a, h
ld [wMagnetTrainDirection], a
ld a, c
ld [wMagnetTrainInitPosition], a
ld a, b
ld [wMagnetTrainHoldPosition], a
ld a, e
ld [wMagnetTrainFinalPosition], a
ld a, d
ld [wMagnetTrainPlayerSpriteInitX], a
ldh a, [hSCX]
push af
ldh a, [hSCY]
push af
call MagnetTrain_LoadGFX_PlayMusic
ld hl, hVBlank
ld a, [hl]
push af
ld [hl], VBLANK_CUTSCENE
.loop
ld a, [wJumptableIndex]
and a
jr z, .initialize
bit 7, a
jr nz, .done
callfar PlaySpriteAnimations
call MagnetTrain_Jumptable
call MagnetTrain_UpdateLYOverrides
call PushLYOverrides
call DelayFrame
jr .loop
.initialize
call MagnetTrain_Jumptable_FirstRunThrough
jr .loop
.done
pop af
ldh [hVBlank], a
call ClearBGPalettes
xor a
ldh [hLCDCPointer], a
ldh [hLYOverrideStart], a
ldh [hLYOverrideEnd], a
ldh [hSCX], a
ld [wRequested2bppSource], a
ld [wRequested2bppSource + 1], a
ld [wRequested2bppDest], a
ld [wRequested2bppDest + 1], a
ld [wRequested2bppSize], a
call ClearTilemap
pop af
ldh [hSCY], a
pop af
ldh [hSCX], a
xor a
ldh [hBGMapMode], a
pop af
ldh [rSVBK], a
ret
MagnetTrain_UpdateLYOverrides:
ld hl, wLYOverridesBackup
ld c, 6 * TILE_WIDTH - 1
ld a, [wMagnetTrainOffset]
add a
ldh [hSCX], a
call .loadloop
ld c, 6 * TILE_WIDTH
ld a, [wMagnetTrainPosition]
call .loadloop
ld c, 6 * TILE_WIDTH + 1
ld a, [wMagnetTrainOffset]
add a
call .loadloop
ld a, [wMagnetTrainDirection]
ld d, a
ld hl, wMagnetTrainOffset
ld a, [hl]
add d
add d
ld [hl], a
ret
.loadloop
ld [hli], a
dec c
jr nz, .loadloop
ret
MagnetTrain_LoadGFX_PlayMusic:
call ClearBGPalettes
call ClearSprites
call DisableLCD
callfar ClearSpriteAnims
call SetMagnetTrainPals
call DrawMagnetTrain
ld a, SCREEN_HEIGHT_PX
ldh [hWY], a
call EnableLCD
xor a
ldh [hBGMapMode], a
ldh [hSCX], a
ldh [hSCY], a
; Load the player sprite's standing frames
ldh a, [rSVBK]
push af
ld a, BANK(wPlayerGender)
ldh [rSVBK], a
farcall GetPlayerIcon
pop af
ldh [rSVBK], a
ld hl, vTiles0
ld c, 4
call Request2bpp
; Load the player sprite's walking frames
ld hl, 12 tiles
add hl, de
ld d, h
ld e, l
ld hl, vTiles0 tile $04
ld c, 4
call Request2bpp
call MagnetTrain_InitLYOverrides
ld hl, wJumptableIndex
xor a
ld [hli], a ; wJumptableIndex
ld a, [wMagnetTrainInitPosition]
ld [hli], a ; wMagnetTrainOffset
ld [hli], a ; wMagnetTrainPosition
ld [hli], a ; wMagnetTrainWaitCounter
ld de, MUSIC_MAGNET_TRAIN
call PlayMusic2
ret
DrawMagnetTrain:
hlbgcoord 0, 0
xor a
.loop
call GetMagnetTrainBGTiles
ld b, BG_MAP_WIDTH / 2
call .FillAlt
inc a
cp SCREEN_HEIGHT
jr c, .loop
hlbgcoord 0, 6
ld de, MagnetTrainTilemap
ld c, SCREEN_WIDTH
call .FillLine
hlbgcoord 0, 7
ld de, MagnetTrainTilemap + SCREEN_WIDTH
ld c, SCREEN_WIDTH
call .FillLine
hlbgcoord 0, 8
ld de, MagnetTrainTilemap + (SCREEN_WIDTH * 2)
ld c, SCREEN_WIDTH
call .FillLine
hlbgcoord 0, 9
ld de, MagnetTrainTilemap + (SCREEN_WIDTH * 3)
ld c, SCREEN_WIDTH
call .FillLine
ret
.FillLine:
ld a, [de]
inc de
ld [hli], a
dec c
jr nz, .FillLine
ret
.FillAlt:
ld [hl], e
inc hl
ld [hl], d
inc hl
dec b
jr nz, .FillAlt
ret
GetMagnetTrainBGTiles:
push hl
ld e, a
ld d, 0
ld hl, MagnetTrainBGTiles
add hl, de
add hl, de
ld e, [hl]
inc hl
ld d, [hl]
pop hl
ret
MagnetTrainBGTiles:
; 2x18 tilemap, repeated in vertical strips for the background.
INCBIN "gfx/overworld/magnet_train_bg.tilemap"
MagnetTrain_InitLYOverrides:
ld hl, wLYOverrides
ld bc, wLYOverridesEnd - wLYOverrides
ld a, [wMagnetTrainInitPosition]
call ByteFill
ld hl, wLYOverridesBackup
ld bc, wLYOverridesBackupEnd - wLYOverridesBackup
ld a, [wMagnetTrainInitPosition]
call ByteFill
ld a, LOW(rSCX)
ldh [hLCDCPointer], a
ret
SetMagnetTrainPals:
ld a, 1
ldh [rVBK], a
; bushes
hlbgcoord 0, 0
ld bc, 4 * BG_MAP_WIDTH
ld a, PAL_BG_GREEN
call ByteFill
; train
hlbgcoord 0, 4
ld bc, 10 * BG_MAP_WIDTH
xor a ; PAL_BG_GRAY
call ByteFill
; more bushes
hlbgcoord 0, 14
ld bc, 4 * BG_MAP_WIDTH
ld a, PAL_BG_GREEN
call ByteFill
; train window
hlbgcoord 7, 8
ld bc, 6
ld a, PAL_BG_YELLOW
call ByteFill
ld a, 0
ldh [rVBK], a
ret
MagnetTrain_Jumptable:
jumptable .Jumptable, wJumptableIndex
.Jumptable:
dw .InitPlayerSpriteAnim
dw .WaitScene
dw .MoveTrain1
dw .WaitScene
dw .MoveTrain2
dw .WaitScene
dw .TrainArrived
.Next:
ld hl, wJumptableIndex
inc [hl]
ret
.InitPlayerSpriteAnim:
ld d, (8 + 2) * TILE_WIDTH + 5
ld a, [wMagnetTrainPlayerSpriteInitX]
ld e, a
ld b, SPRITE_ANIM_OBJ_MAGNET_TRAIN_RED
ldh a, [rSVBK]
push af
ld a, BANK(wPlayerGender)
ldh [rSVBK], a
ld a, [wPlayerGender]
bit PLAYERGENDER_FEMALE_F, a
jr z, .got_gender
ld b, SPRITE_ANIM_OBJ_MAGNET_TRAIN_BLUE
.got_gender
pop af
ldh [rSVBK], a
ld a, b
call InitSpriteAnimStruct
ld hl, SPRITEANIMSTRUCT_TILE_ID
add hl, bc
ld [hl], 0
call .Next
ld a, 128
ld [wMagnetTrainWaitCounter], a
ret
.MoveTrain1:
ld hl, wMagnetTrainHoldPosition
ld a, [wMagnetTrainPosition]
cp [hl]
jr z, .PrepareToHoldTrain
ld e, a
ld a, [wMagnetTrainDirection]
xor $ff
inc a
add e
ld [wMagnetTrainPosition], a
ld hl, wGlobalAnimXOffset
ld a, [wMagnetTrainDirection]
add [hl]
ld [hl], a
ret
.PrepareToHoldTrain:
call .Next
ld a, 128
ld [wMagnetTrainWaitCounter], a
ret
.WaitScene:
ld hl, wMagnetTrainWaitCounter
ld a, [hl]
and a
jr z, .DoneWaiting
dec [hl]
ret
.DoneWaiting:
call .Next
ret
.MoveTrain2:
ld hl, wMagnetTrainFinalPosition
ld a, [wMagnetTrainPosition]
cp [hl]
jr z, .PrepareToFinishAnim
ld e, a
ld a, [wMagnetTrainDirection]
xor $ff
inc a
ld d, a
ld a, e
add d
add d
ld [wMagnetTrainPosition], a
ld hl, wGlobalAnimXOffset
ld a, [wMagnetTrainDirection]
ld d, a
ld a, [hl]
add d
add d
ld [hl], a
ret
ret
.PrepareToFinishAnim:
call .Next
ret
.TrainArrived:
ld a, $80
ld [wJumptableIndex], a
ld de, SFX_TRAIN_ARRIVED
call PlaySFX
ret
MagnetTrain_Jumptable_FirstRunThrough:
farcall PlaySpriteAnimations
call MagnetTrain_Jumptable
call MagnetTrain_UpdateLYOverrides
call PushLYOverrides
call DelayFrame
ldh a, [rSVBK]
push af
ld a, BANK(wEnvironment)
ldh [rSVBK], a
ld a, [wTimeOfDayPal]
push af
ld a, [wEnvironment]
push af
ld a, [wTimeOfDay]
maskbits NUM_DAYTIMES
ld [wTimeOfDayPal], a
ld a, TOWN
ld [wEnvironment], a
ld b, SCGB_MAPPALS
call GetSGBLayout
call UpdateTimePals
ldh a, [rBGP]
ld [wBGP], a
ldh a, [rOBP0]
ld [wOBP0], a
ldh a, [rOBP1]
ld [wOBP1], a
pop af
ld [wEnvironment], a
pop af
ld [wTimeOfDayPal], a
pop af
ldh [rSVBK], a
ret
MagnetTrainTilemap:
; 20x4 tilemap
INCBIN "gfx/overworld/magnet_train_fg.tilemap"