ref: a77999f7f151567a47dd69affe9a29378f298ff4
dir: /engine/battle/battle_transitions.asm/
BattleTransition: ld a, 1 ld [hAutoBGTransferEnabled], a call Delay3 xor a ld [hWY], a dec a ld [wUpdateSpritesEnabled], a call DelayFrame ; Determine which OAM block is being used by the enemy trainer sprite (if there ; is one). ld hl, wSpriteStateData1 + 2 ld a, [hSpriteIndexOrTextID] ; enemy trainer sprite index (0 if wild battle) ld c, a ld b, 0 ld de, $10 .loop1 ld a, [hl] cp $ff jr z, .skip1 inc b .skip1 add hl, de dec c jr nz, .loop1 ; Clear OAM except for the blocks used by the player and enemy trainer sprites. ld hl, wOAMBuffer + $10 ld c, 9 .loop2 ld a, b swap a cp l jr z, .skip2 ; skip clearing the block if the enemy trainer is using it push hl push bc ld bc, $10 xor a call FillMemory pop bc pop hl .skip2 ld de, $10 add hl, de dec c jr nz, .loop2 call Delay3 call LoadBattleTransitionTile ld bc, 0 ld a, [wLinkState] cp LINK_STATE_BATTLING jr z, .linkBattle call GetBattleTransitionID_WildOrTrainer call GetBattleTransitionID_CompareLevels call GetBattleTransitionID_IsDungeonMap .linkBattle ld hl, BattleTransitions add hl, bc add hl, bc ld a, [hli] ld h, [hl] ld l, a jp hl ; the three GetBattleTransitionID functions set the first ; three bits of c, which determines what transition animation ; to play at the beginning of a battle ; bit 0: set if trainer battle ; bit 1: set if enemy is at least 3 levels higher than player ; bit 2: set if dungeon map BattleTransitions: dw BattleTransition_DoubleCircle ; %000 dw BattleTransition_Spiral ; %001 dw BattleTransition_Circle ; %010 dw BattleTransition_Spiral ; %011 dw BattleTransition_HorizontalStripes ; %100 dw BattleTransition_Shrink ; %101 dw BattleTransition_VerticalStripes ; %110 dw BattleTransition_Split ; %111 GetBattleTransitionID_WildOrTrainer: ld a, [wCurOpponent] cp OPP_ID_OFFSET jr nc, .trainer res 0, c ret .trainer set 0, c ret GetBattleTransitionID_CompareLevels: ld hl, wPartyMon1HP .faintedLoop ld a, [hli] or [hl] jr nz, .notFainted ld de, wPartyMon2 - (wPartyMon1 + 1) add hl, de jr .faintedLoop .notFainted ld de, wPartyMon1Level - (wPartyMon1HP + 1) add hl, de ld a, [hl] add $3 ld e, a ld a, [wCurEnemyLVL] sub e jr nc, .highLevelEnemy res 1, c ld a, 1 ld [wBattleTransitionSpiralDirection], a ret .highLevelEnemy set 1, c xor a ld [wBattleTransitionSpiralDirection], a ret ; fails to recognize VICTORY_ROAD_2F, VICTORY_ROAD_3F, all ROCKET_HIDEOUT maps, ; POKEMON_MANSION_1F, SEAFOAM_ISLANDS_[B1F-B4F], POWER_PLANT, DIGLETTS_CAVE ; and SILPH_CO_[9-11]F as dungeon maps GetBattleTransitionID_IsDungeonMap: ld a, [wCurMap] ld e, a ld hl, DungeonMaps1 .loop1 ld a, [hli] cp $ff jr z, .noMatch1 cp e jr nz, .loop1 .match set 2, c ret .noMatch1 ld hl, DungeonMaps2 .loop2 ld a, [hli] cp $ff jr z, .noMatch2 ld d, a ld a, [hli] cp e jr c, .loop2 ld a, e cp d jr nc, .match .noMatch2 res 2, c ret INCLUDE "data/maps/dungeon_maps.asm" LoadBattleTransitionTile: ld hl, vChars1 + $7f0 ld de, BattleTransitionTile lb bc, BANK(BattleTransitionTile), (BattleTransitionTileEnd - BattleTransitionTile) / $10 jp CopyVideoData BattleTransitionTile: INCBIN "gfx/overworld/battle_transition.2bpp" BattleTransitionTileEnd: BattleTransition_BlackScreen: ld a, $ff ld [rBGP], a ld [rOBP0], a ld [rOBP1], a ret ; for non-dungeon trainer battles ; called regardless of mon levels, but does an ; outward spiral if enemy is at least 3 levels ; higher than player and does an inward spiral otherwise BattleTransition_Spiral: ld a, [wBattleTransitionSpiralDirection] and a jr z, .outwardSpiral call BattleTransition_InwardSpiral jr .done .outwardSpiral coord hl, 10, 10 ld a, $3 ld [wOutwardSpiralCurrentDirection], a ld a, l ld [wOutwardSpiralTileMapPointer + 1], a ld a, h ld [wOutwardSpiralTileMapPointer], a ld b, 120 .loop ld c, 3 .innerLoop push bc call BattleTransition_OutwardSpiral_ pop bc dec c jr nz, .innerLoop call DelayFrame dec b jr nz, .loop .done call BattleTransition_BlackScreen xor a ld [wOutwardSpiralTileMapPointer + 1], a ld [wOutwardSpiralTileMapPointer], a ret BattleTransition_InwardSpiral: ld a, 7 ld [wInwardSpiralUpdateScreenCounter], a coord hl, 0, 0 ld c, SCREEN_HEIGHT - 1 ld de, SCREEN_WIDTH call BattleTransition_InwardSpiral_ inc c jr .skip .loop ld de, SCREEN_WIDTH call BattleTransition_InwardSpiral_ .skip inc c ld de, 1 call BattleTransition_InwardSpiral_ dec c dec c ld de, -SCREEN_WIDTH call BattleTransition_InwardSpiral_ inc c ld de, -1 call BattleTransition_InwardSpiral_ dec c dec c ld a, c and a jr nz, .loop ret BattleTransition_InwardSpiral_: push bc .loop ld [hl], $ff add hl, de push bc ld a, [wInwardSpiralUpdateScreenCounter] dec a jr nz, .skip call BattleTransition_TransferDelay3 ld a, 7 .skip ld [wInwardSpiralUpdateScreenCounter], a pop bc dec c jr nz, .loop pop bc ret BattleTransition_OutwardSpiral_: ld bc, -SCREEN_WIDTH ld de, SCREEN_WIDTH ld a, [wOutwardSpiralTileMapPointer + 1] ld l, a ld a, [wOutwardSpiralTileMapPointer] ld h, a ld a, [wOutwardSpiralCurrentDirection] cp $0 jr z, .up cp $1 jr z, .left cp $2 jr z, .down cp $3 jr z, .right .keepSameDirection ld [hl], $ff .done ld a, l ld [wOutwardSpiralTileMapPointer + 1], a ld a, h ld [wOutwardSpiralTileMapPointer], a ret .up dec hl ld a, [hl] cp $ff jr nz, .changeDirection inc hl add hl, bc jr .keepSameDirection .left add hl, de ld a, [hl] cp $ff jr nz, .changeDirection add hl, bc dec hl jr .keepSameDirection .down inc hl ld a, [hl] cp $ff jr nz, .changeDirection dec hl add hl, de jr .keepSameDirection .right add hl, bc ld a, [hl] cp $ff jr nz, .changeDirection add hl, de inc hl jr .keepSameDirection .changeDirection ld [hl], $ff ld a, [wOutwardSpiralCurrentDirection] inc a cp $4 jr nz, .skip xor a .skip ld [wOutwardSpiralCurrentDirection], a jr .done FlashScreen: BattleTransition_FlashScreen_: ld hl, BattleTransition_FlashScreenPalettes .loop ld a, [hli] cp $1 jr z, .done ld [rBGP], a ld c, 2 call DelayFrames jr .loop .done dec b jr nz, BattleTransition_FlashScreen_ ret BattleTransition_FlashScreenPalettes: db $F9,$FE,$FF,$FE,$F9,$E4,$90,$40,$00,$40,$90,$E4 db $01 ; terminator ; used for low level trainer dungeon battles BattleTransition_Shrink: ld c, SCREEN_HEIGHT / 2 .loop push bc xor a ld [hAutoBGTransferEnabled], a coord hl, 0, 7 coord de, 0, 8 ld bc, -SCREEN_WIDTH * 2 call BattleTransition_CopyTiles1 coord hl, 0, 10 coord de, 0, 9 ld bc, SCREEN_WIDTH * 2 call BattleTransition_CopyTiles1 coord hl, 8, 0 coord de, 9, 0 ld bc, -2 call BattleTransition_CopyTiles2 coord hl, 11, 0 coord de, 10, 0 ld bc, 2 call BattleTransition_CopyTiles2 ld a, $1 ld [hAutoBGTransferEnabled], a ld c, 6 call DelayFrames pop bc dec c jr nz, .loop call BattleTransition_BlackScreen ld c, 10 jp DelayFrames ; used for high level trainer dungeon battles BattleTransition_Split: ld c, SCREEN_HEIGHT / 2 xor a ld [hAutoBGTransferEnabled], a .loop push bc coord hl, 0, 16 coord de, 0, 17 ld bc, -SCREEN_WIDTH * 2 call BattleTransition_CopyTiles1 coord hl, 0, 1 coord de, 0, 0 ld bc, SCREEN_WIDTH * 2 call BattleTransition_CopyTiles1 coord hl, 18, 0 coord de, 19, 0 ld bc, -2 call BattleTransition_CopyTiles2 coord hl, 1, 0 coord de, 0, 0 ld bc, 2 call BattleTransition_CopyTiles2 call BattleTransition_TransferDelay3 call Delay3 pop bc dec c jr nz, .loop call BattleTransition_BlackScreen ld c, 10 jp DelayFrames BattleTransition_CopyTiles1: ld a, c ld [wBattleTransitionCopyTilesOffset], a ld a, b ld [wBattleTransitionCopyTilesOffset + 1], a ld c, 8 .loop1 push bc push hl push de ld bc, SCREEN_WIDTH call CopyData pop hl pop de ld a, [wBattleTransitionCopyTilesOffset] ld c, a ld a, [wBattleTransitionCopyTilesOffset + 1] ld b, a add hl, bc pop bc dec c jr nz, .loop1 ld l, e ld h, d ld a, $ff ld c, SCREEN_WIDTH .loop2 ld [hli], a dec c jr nz, .loop2 ret BattleTransition_CopyTiles2: ld a, c ld [wBattleTransitionCopyTilesOffset], a ld a, b ld [wBattleTransitionCopyTilesOffset + 1], a ld c, SCREEN_HEIGHT / 2 .loop1 push bc push hl push de ld c, SCREEN_HEIGHT .loop2 ld a, [hl] ld [de], a ld a, e add SCREEN_WIDTH jr nc, .noCarry1 inc d .noCarry1 ld e, a ld a, l add SCREEN_WIDTH jr nc, .noCarry2 inc h .noCarry2 ld l, a dec c jr nz, .loop2 pop hl pop de ld a, [wBattleTransitionCopyTilesOffset] ld c, a ld a, [wBattleTransitionCopyTilesOffset + 1] ld b, a add hl, bc pop bc dec c jr nz, .loop1 ld l, e ld h, d ld de, SCREEN_WIDTH ld c, SCREEN_HEIGHT .loop3 ld [hl], $ff add hl, de dec c jr nz, .loop3 ret ; used for high level wild dungeon battles BattleTransition_VerticalStripes: ld c, SCREEN_HEIGHT coord hl, 0, 0 coord de, 1, 17 xor a ld [hAutoBGTransferEnabled], a .loop push bc push hl push de push de call BattleTransition_VerticalStripes_ pop hl call BattleTransition_VerticalStripes_ call BattleTransition_TransferDelay3 pop hl ld bc, -SCREEN_WIDTH add hl, bc ld e, l ld d, h pop hl ld bc, SCREEN_WIDTH add hl, bc pop bc dec c jr nz, .loop jp BattleTransition_BlackScreen BattleTransition_VerticalStripes_: ld c, SCREEN_WIDTH / 2 .loop ld [hl], $ff inc hl inc hl dec c jr nz, .loop ret ; used for low level wild dungeon battles BattleTransition_HorizontalStripes: ld c, SCREEN_WIDTH coord hl, 0, 0 coord de, 19, 1 xor a ld [hAutoBGTransferEnabled], a .loop push bc push hl push de push de call BattleTransition_HorizontalStripes_ pop hl call BattleTransition_HorizontalStripes_ call BattleTransition_TransferDelay3 pop de pop hl pop bc inc hl dec de dec c jr nz, .loop jp BattleTransition_BlackScreen BattleTransition_HorizontalStripes_: ld c, SCREEN_HEIGHT / 2 ld de, SCREEN_WIDTH * 2 .loop ld [hl], $ff add hl, de dec c jr nz, .loop ret ; used for high level wild non-dungeon battles ; makes one full circle around the screen ; by animating each half circle one at a time BattleTransition_Circle: call BattleTransition_FlashScreen lb bc, 0, SCREEN_WIDTH / 2 ld hl, BattleTransition_HalfCircle1 call BattleTransition_Circle_Sub1 ld c, SCREEN_WIDTH / 2 ld b, 1 ld hl, BattleTransition_HalfCircle2 call BattleTransition_Circle_Sub1 jp BattleTransition_BlackScreen BattleTransition_FlashScreen: ld b, $3 call BattleTransition_FlashScreen_ xor a ld [hAutoBGTransferEnabled], a ret BattleTransition_Circle_Sub1: push bc push hl ld a, b call BattleTransition_Circle_Sub2 pop hl ld bc, 5 add hl, bc call BattleTransition_TransferDelay3 pop bc dec c jr nz, BattleTransition_Circle_Sub1 ret BattleTransition_TransferDelay3: ld a, 1 ld [hAutoBGTransferEnabled], a call Delay3 xor a ld [hAutoBGTransferEnabled], a ret ; used for low level wild non-dungeon battles ; makes two half circles around the screen ; by animating both half circles at the same time BattleTransition_DoubleCircle: call BattleTransition_FlashScreen ld c, SCREEN_WIDTH / 2 ld hl, BattleTransition_HalfCircle1 ld de, BattleTransition_HalfCircle2 .loop push bc push hl push de push de xor a call BattleTransition_Circle_Sub2 pop hl ld a, $1 call BattleTransition_Circle_Sub2 pop hl ld bc, 5 add hl, bc ld e, l ld d, h pop hl add hl, bc call BattleTransition_TransferDelay3 pop bc dec c jr nz, .loop jp BattleTransition_BlackScreen BattleTransition_Circle_Sub2: ld [wBattleTransitionCircleScreenQuadrantY], a ld a, [hli] ld [wBattleTransitionCircleScreenQuadrantX], a ld a, [hli] ld e, a ld a, [hli] ld d, a ld a, [hli] ld h, [hl] ld l, a jp BattleTransition_Circle_Sub3 BattleTransition_HalfCircle1: db $01 dw BattleTransition_CircleData1 dwCoord 18, 6 db $01 dw BattleTransition_CircleData2 dwCoord 19, 3 db $01 dw BattleTransition_CircleData3 dwCoord 18, 0 db $01 dw BattleTransition_CircleData4 dwCoord 14, 0 db $01 dw BattleTransition_CircleData5 dwCoord 10, 0 db $00 dw BattleTransition_CircleData5 dwCoord 9, 0 db $00 dw BattleTransition_CircleData4 dwCoord 5, 0 db $00 dw BattleTransition_CircleData3 dwCoord 1, 0 db $00 dw BattleTransition_CircleData2 dwCoord 0, 3 db $00 dw BattleTransition_CircleData1 dwCoord 1, 6 BattleTransition_HalfCircle2: db $00 dw BattleTransition_CircleData1 dwCoord 1, 11 db $00 dw BattleTransition_CircleData2 dwCoord 0, 14 db $00 dw BattleTransition_CircleData3 dwCoord 1, 17 db $00 dw BattleTransition_CircleData4 dwCoord 5, 17 db $00 dw BattleTransition_CircleData5 dwCoord 9, 17 db $01 dw BattleTransition_CircleData5 dwCoord 10, 17 db $01 dw BattleTransition_CircleData4 dwCoord 14, 17 db $01 dw BattleTransition_CircleData3 dwCoord 18, 17 db $01 dw BattleTransition_CircleData2 dwCoord 19, 14 db $01 dw BattleTransition_CircleData1 dwCoord 18, 11 BattleTransition_Circle_Sub3: push hl ld a, [de] ld c, a inc de .loop1 ld [hl], $ff ld a, [wBattleTransitionCircleScreenQuadrantX] and a jr z, .skip1 inc hl jr .skip2 .skip1 dec hl .skip2 dec c jr nz, .loop1 pop hl ld a, [wBattleTransitionCircleScreenQuadrantY] and a ld bc, SCREEN_WIDTH jr z, .skip3 ld bc, -SCREEN_WIDTH .skip3 add hl, bc ld a, [de] inc de cp $ff ret z and a jr z, BattleTransition_Circle_Sub3 ld c, a .loop2 ld a, [wBattleTransitionCircleScreenQuadrantX] and a jr z, .skip4 dec hl jr .skip5 .skip4 inc hl .skip5 dec c jr nz, .loop2 jr BattleTransition_Circle_Sub3 BattleTransition_CircleData1: db $02,$03,$05,$04,$09,$FF BattleTransition_CircleData2: db $01,$01,$02,$02,$04,$02,$04,$02,$03,$FF BattleTransition_CircleData3: db $02,$01,$03,$01,$04,$01,$04,$01,$04,$01,$03,$01,$02,$01,$01,$01,$01,$FF BattleTransition_CircleData4: db $04,$01,$04,$00,$03,$01,$03,$00,$02,$01,$02,$00,$01,$FF BattleTransition_CircleData5: db $04,$00,$03,$00,$03,$00,$02,$00,$02,$00,$01,$00,$01,$00,$01,$FF