ref: 3648afda1694fcb4d6fe6625b14f5a3f8bc29c38
dir: /engine/events/magnet_train.asm/
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], 1 .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_INDEX_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_INDEX_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"