ref: 70dde9d96b0e3025c72ae29783e94c56fa5cbe1c
dir: /home/overworld.asm/
HandleMidJump:: ; Handle the player jumping down ; a ledge in the overworld. jpba _HandleMidJump EnterMap:: ; Load a new map. ld a, $ff ld [wJoyIgnore], a call LoadMapData callba ClearVariablesAfterLoadingMapData ld hl, wd72c bit 0, [hl] ; has the player already made 3 steps since the last battle? jr z, .skipGivingThreeStepsOfNoRandomBattles ld a, 3 ; minimum number of steps between battles ld [wNumberOfNoRandomBattleStepsLeft], a .skipGivingThreeStepsOfNoRandomBattles ld hl, wd72e bit 5, [hl] ; did a battle happen immediately before this? res 5, [hl] ; unset the "battle just happened" flag call z, ResetUsingStrengthOutOfBattleBit call nz, MapEntryAfterBattle ld hl, wd732 ld a, [hl] and 1 << 4 | 1 << 3 ; fly warp or dungeon warp jr z, .didNotEnterUsingFlyWarpOrDungeonWarp res 3, [hl] callba EnterMapAnim call UpdateSprites .didNotEnterUsingFlyWarpOrDungeonWarp callba CheckForceBikeOrSurf ; handle currents in SF islands and forced bike riding in cycling road ld hl, wd72d res 5, [hl] call UpdateSprites ld hl, wCurrentMapScriptFlags set 5, [hl] set 6, [hl] xor a ld [wJoyIgnore], a OverworldLoop:: call DelayFrame OverworldLoopLessDelay:: call DelayFrame call LoadGBPal ld a,[wd736] bit 6,a ; jumping down a ledge? call nz, HandleMidJump ld a,[wWalkCounter] and a jp nz,.moveAhead ; if the player sprite has not yet completed the walking animation call JoypadOverworld ; get joypad state (which is possibly simulated) callba SafariZoneCheck ld a,[wSafariZoneGameOver] and a jp nz,WarpFound2 ld hl,wd72d bit 3,[hl] res 3,[hl] jp nz,WarpFound2 ld a,[wd732] and 1 << 4 | 1 << 3 ; fly warp or dungeon warp jp nz,HandleFlyWarpOrDungeonWarp ld a,[wCurOpponent] and a jp nz,.newBattle ld a,[wd730] bit 7,a ; are we simulating button presses? jr z,.notSimulating ld a,[hJoyHeld] jr .checkIfStartIsPressed .notSimulating ld a,[hJoyPressed] .checkIfStartIsPressed bit 3,a ; start button jr z,.startButtonNotPressed ; if START is pressed xor a ld [hSpriteIndexOrTextID],a ; start menu text ID jp .displayDialogue .startButtonNotPressed bit 0,a ; A button jp z,.checkIfDownButtonIsPressed ; if A is pressed ld a,[wd730] bit 2,a jp nz,.noDirectionButtonsPressed call IsPlayerCharacterBeingControlledByGame jr nz,.checkForOpponent call CheckForHiddenObjectOrBookshelfOrCardKeyDoor ld a,[$ffeb] and a jp z,OverworldLoop ; jump if a hidden object or bookshelf was found, but not if a card key door was found call IsSpriteOrSignInFrontOfPlayer ld a,[hSpriteIndexOrTextID] and a jp z,OverworldLoop .displayDialogue predef GetTileAndCoordsInFrontOfPlayer call UpdateSprites ld a,[wFlags_0xcd60] bit 2,a jr nz,.checkForOpponent bit 0,a jr nz,.checkForOpponent aCoord 8, 9 ld [wTilePlayerStandingOn],a ; unused? call DisplayTextID ; display either the start menu or the NPC/sign text ld a,[wEnteringCableClub] and a jr z,.checkForOpponent dec a ld a,0 ld [wEnteringCableClub],a jr z,.changeMap ; XXX can this code be reached? predef LoadSAV ld a,[wCurMap] ld [wDestinationMap],a call SpecialWarpIn ld a,[wCurMap] call SwitchToMapRomBank ; switch to the ROM bank of the current map ld hl,wCurMapTileset set 7,[hl] .changeMap jp EnterMap .checkForOpponent ld a,[wCurOpponent] and a jp nz,.newBattle jp OverworldLoop .noDirectionButtonsPressed ld hl,wFlags_0xcd60 res 2,[hl] call UpdateSprites ld a, 1 ld [wCheckFor180DegreeTurn],a ld a,[wPlayerMovingDirection] ; the direction that was pressed last time and a jp z,OverworldLoop ; if a direction was pressed last time ld [wPlayerLastStopDirection],a ; save the last direction xor a ld [wPlayerMovingDirection],a ; zero the direction jp OverworldLoop .checkIfDownButtonIsPressed ld a,[hJoyHeld] ; current joypad state bit 7,a ; down button jr z,.checkIfUpButtonIsPressed ld a,1 ld [wSpriteStateData1 + 3],a ; delta Y ld a,PLAYER_DIR_DOWN jr .handleDirectionButtonPress .checkIfUpButtonIsPressed bit 6,a ; up button jr z,.checkIfLeftButtonIsPressed ld a,-1 ld [wSpriteStateData1 + 3],a ; delta Y ld a,PLAYER_DIR_UP jr .handleDirectionButtonPress .checkIfLeftButtonIsPressed bit 5,a ; left button jr z,.checkIfRightButtonIsPressed ld a,-1 ld [wSpriteStateData1 + 5],a ; delta X ld a,PLAYER_DIR_LEFT jr .handleDirectionButtonPress .checkIfRightButtonIsPressed bit 4,a ; right button jr z,.noDirectionButtonsPressed ld a, 1 ld [wSpriteStateData1 + 5],a ; delta X .handleDirectionButtonPress ld [wPlayerDirection],a ; new direction ld a,[wd730] bit 7,a ; are we simulating button presses? jr nz,.noDirectionChange ; ignore direction changes if we are ld a,[wCheckFor180DegreeTurn] and a jr z,.noDirectionChange ld a,[wPlayerDirection] ; new direction ld b,a ld a,[wPlayerLastStopDirection] ; old direction cp b jr z,.noDirectionChange ; Check whether the player did a 180-degree turn. ; It appears that this code was supposed to show the player rotate by having ; the player's sprite face an intermediate direction before facing the opposite ; direction (instead of doing an instantaneous about-face), but the intermediate ; direction is only set for a short period of time. It is unlikely for it to ; ever be visible because DelayFrame is called at the start of OverworldLoop and ; normally not enough cycles would be executed between then and the time the ; direction is set for V-blank to occur while the direction is still set. swap a ; put old direction in upper half or b ; put new direction in lower half cp a,(PLAYER_DIR_DOWN << 4) | PLAYER_DIR_UP ; change dir from down to up jr nz,.notDownToUp ld a,PLAYER_DIR_LEFT ld [wPlayerMovingDirection],a jr .holdIntermediateDirectionLoop .notDownToUp cp a,(PLAYER_DIR_UP << 4) | PLAYER_DIR_DOWN ; change dir from up to down jr nz,.notUpToDown ld a,PLAYER_DIR_RIGHT ld [wPlayerMovingDirection],a jr .holdIntermediateDirectionLoop .notUpToDown cp a,(PLAYER_DIR_RIGHT << 4) | PLAYER_DIR_LEFT ; change dir from right to left jr nz,.notRightToLeft ld a,PLAYER_DIR_DOWN ld [wPlayerMovingDirection],a jr .holdIntermediateDirectionLoop .notRightToLeft cp a,(PLAYER_DIR_LEFT << 4) | PLAYER_DIR_RIGHT ; change dir from left to right jr nz,.holdIntermediateDirectionLoop ld a,PLAYER_DIR_UP ld [wPlayerMovingDirection],a .holdIntermediateDirectionLoop ld hl,wFlags_0xcd60 set 2,[hl] ld hl,wCheckFor180DegreeTurn dec [hl] jr nz,.holdIntermediateDirectionLoop ld a,[wPlayerDirection] ld [wPlayerMovingDirection],a call NewBattle jp c,.battleOccurred jp OverworldLoop .noDirectionChange ld a,[wPlayerDirection] ; current direction ld [wPlayerMovingDirection],a ; save direction call UpdateSprites ld a,[wWalkBikeSurfState] cp $02 ; surfing jr z,.surfing ; not surfing call CollisionCheckOnLand jr nc,.noCollision ; collision occurred push hl ld hl,wd736 bit 2,[hl] ; standing on warp flag pop hl jp z,OverworldLoop ; collision occurred while standing on a warp push hl call ExtraWarpCheck ; sets carry if there is a potential to warp pop hl jp c,CheckWarpsCollision jp OverworldLoop .surfing call CollisionCheckOnWater jp c,OverworldLoop .noCollision ld a,$08 ld [wWalkCounter],a jr .moveAhead2 .moveAhead ld a,[wd736] bit 7,a jr z,.noSpinning callba LoadSpinnerArrowTiles .noSpinning call UpdateSprites .moveAhead2 ld hl,wFlags_0xcd60 res 2,[hl] ld a,[wWalkBikeSurfState] dec a ; riding a bike? jr nz,.normalPlayerSpriteAdvancement ld a,[wd736] bit 6,a ; jumping a ledge? jr nz,.normalPlayerSpriteAdvancement call DoBikeSpeedup .normalPlayerSpriteAdvancement call AdvancePlayerSprite ld a,[wWalkCounter] and a jp nz,CheckMapConnections ; it seems like this check will never succeed (the other place where CheckMapConnections is run works) ; walking animation finished ld a,[wd730] bit 7,a jr nz,.doneStepCounting ; if button presses are being simulated, don't count steps ; step counting ld hl,wStepCounter dec [hl] ld a,[wd72c] bit 0,a jr z,.doneStepCounting ld hl,wNumberOfNoRandomBattleStepsLeft dec [hl] jr nz,.doneStepCounting ld hl,wd72c res 0,[hl] ; indicate that the player has stepped thrice since the last battle .doneStepCounting CheckEvent EVENT_IN_SAFARI_ZONE jr z,.notSafariZone callba SafariZoneCheckSteps ld a,[wSafariZoneGameOver] and a jp nz,WarpFound2 .notSafariZone ld a,[wIsInBattle] and a jp nz,CheckWarpsNoCollision predef ApplyOutOfBattlePoisonDamage ; also increment daycare mon exp ld a,[wOutOfBattleBlackout] and a jp nz,HandleBlackOut ; if all pokemon fainted .newBattle call NewBattle ld hl,wd736 res 2,[hl] ; standing on warp flag jp nc,CheckWarpsNoCollision ; check for warps if there was no battle .battleOccurred ld hl,wd72d res 6,[hl] ld hl,wFlags_D733 res 3,[hl] ld hl,wCurrentMapScriptFlags set 5,[hl] set 6,[hl] xor a ld [hJoyHeld],a ld a,[wCurMap] cp CINNABAR_GYM jr nz,.notCinnabarGym SetEvent EVENT_2A7 .notCinnabarGym ld hl,wd72e set 5,[hl] ld a,[wCurMap] cp OAKS_LAB jp z,.noFaintCheck ; no blacking out if the player lost to the rival in Oak's lab callab AnyPartyAlive ld a,d and a jr z,.allPokemonFainted .noFaintCheck ld c,10 call DelayFrames jp EnterMap .allPokemonFainted ld a,$ff ld [wIsInBattle],a call RunMapScript jp HandleBlackOut ; function to determine if there will be a battle and execute it (either a trainer battle or wild battle) ; sets carry if a battle occurred and unsets carry if not NewBattle:: ld a,[wd72d] bit 4,a jr nz,.noBattle call IsPlayerCharacterBeingControlledByGame jr nz,.noBattle ; no battle if the player character is under the game's control ld a,[wd72e] bit 4,a jr nz,.noBattle jpba InitBattle .noBattle and a ret ; function to make bikes twice as fast as walking DoBikeSpeedup:: ld a,[wNPCMovementScriptPointerTableNum] and a ret nz ld a,[wCurMap] cp ROUTE_17 ; Cycling Road jr nz,.goFaster ld a,[hJoyHeld] and D_UP | D_LEFT | D_RIGHT ret nz .goFaster jp AdvancePlayerSprite ; check if the player has stepped onto a warp after having not collided CheckWarpsNoCollision:: ld a,[wNumberOfWarps] and a jp z,CheckMapConnections ld a,[wNumberOfWarps] ld b,0 ld c,a ld a,[wYCoord] ld d,a ld a,[wXCoord] ld e,a ld hl,wWarpEntries CheckWarpsNoCollisionLoop:: ld a,[hli] ; check if the warp's Y position matches cp d jr nz,CheckWarpsNoCollisionRetry1 ld a,[hli] ; check if the warp's X position matches cp e jr nz,CheckWarpsNoCollisionRetry2 ; if a match was found push hl push bc ld hl,wd736 set 2,[hl] ; standing on warp flag callba IsPlayerStandingOnDoorTileOrWarpTile pop bc pop hl jr c,WarpFound1 ; jump if standing on door or warp push hl push bc call ExtraWarpCheck pop bc pop hl jr nc,CheckWarpsNoCollisionRetry2 ; if the extra check passed ld a,[wFlags_D733] bit 2,a jr nz,WarpFound1 push de push bc call Joypad pop bc pop de ld a,[hJoyHeld] and D_DOWN | D_UP | D_LEFT | D_RIGHT jr z,CheckWarpsNoCollisionRetry2 ; if directional buttons aren't being pressed, do not pass through the warp jr WarpFound1 ; check if the player has stepped onto a warp after having collided CheckWarpsCollision:: ld a,[wNumberOfWarps] ld c,a ld hl,wWarpEntries .loop ld a,[hli] ; Y coordinate of warp ld b,a ld a,[wYCoord] cp b jr nz,.retry1 ld a,[hli] ; X coordinate of warp ld b,a ld a,[wXCoord] cp b jr nz,.retry2 ld a,[hli] ld [wDestinationWarpID],a ld a,[hl] ld [hWarpDestinationMap],a jr WarpFound2 .retry1 inc hl .retry2 inc hl inc hl dec c jr nz,.loop jp OverworldLoop CheckWarpsNoCollisionRetry1:: inc hl CheckWarpsNoCollisionRetry2:: inc hl inc hl jp ContinueCheckWarpsNoCollisionLoop WarpFound1:: ld a,[hli] ld [wDestinationWarpID],a ld a,[hli] ld [hWarpDestinationMap],a WarpFound2:: ld a,[wNumberOfWarps] sub c ld [wWarpedFromWhichWarp],a ; save ID of used warp ld a,[wCurMap] ld [wWarpedFromWhichMap],a call CheckIfInOutsideMap jr nz,.indoorMaps ; this is for handling "outside" maps that can't have the 0xFF destination map ld a,[wCurMap] ld [wLastMap],a ld a,[wCurMapWidth] ld [wUnusedD366],a ; not read ld a,[hWarpDestinationMap] ld [wCurMap],a cp ROCK_TUNNEL_1 jr nz,.notRockTunnel ld a,$06 ld [wMapPalOffset],a call GBFadeOutToBlack .notRockTunnel call PlayMapChangeSound jr .done ; for maps that can have the 0xFF destination map, which means to return to the outside map ; not all these maps are necessarily indoors, though .indoorMaps ld a,[hWarpDestinationMap] ; destination map cp $ff jr z,.goBackOutside ; if not going back to the previous map ld [wCurMap],a callba IsPlayerStandingOnWarpPadOrHole ld a,[wStandingOnWarpPadOrHole] dec a ; is the player on a warp pad? jr nz,.notWarpPad ; if the player is on a warp pad ld hl,wd732 set 3,[hl] call LeaveMapAnim jr .skipMapChangeSound .notWarpPad call PlayMapChangeSound .skipMapChangeSound ld hl,wd736 res 0,[hl] res 1,[hl] jr .done .goBackOutside ld a,[wLastMap] ld [wCurMap],a call PlayMapChangeSound xor a ld [wMapPalOffset],a .done ld hl,wd736 set 0,[hl] ; have the player's sprite step out from the door (if there is one) call IgnoreInputForHalfSecond jp EnterMap ContinueCheckWarpsNoCollisionLoop:: inc b ; increment warp number dec c ; decrement number of warps jp nz,CheckWarpsNoCollisionLoop ; if no matching warp was found CheckMapConnections:: .checkWestMap ld a,[wXCoord] cp $ff jr nz,.checkEastMap ld a,[wMapConn3Ptr] ld [wCurMap],a ld a,[wWestConnectedMapXAlignment] ; new X coordinate upon entering west map ld [wXCoord],a ld a,[wYCoord] ld c,a ld a,[wWestConnectedMapYAlignment] ; Y adjustment upon entering west map add c ld c,a ld [wYCoord],a ld a,[wWestConnectedMapViewPointer] ; pointer to upper left corner of map without adjustment for Y position ld l,a ld a,[wWestConnectedMapViewPointer + 1] ld h,a srl c jr z,.savePointer1 .pointerAdjustmentLoop1 ld a,[wWestConnectedMapWidth] ; width of connected map add MAP_BORDER * 2 ld e,a ld d,0 ld b,0 add hl,de dec c jr nz,.pointerAdjustmentLoop1 .savePointer1 ld a,l ld [wCurrentTileBlockMapViewPointer],a ; pointer to upper left corner of current tile block map section ld a,h ld [wCurrentTileBlockMapViewPointer + 1],a jp .loadNewMap .checkEastMap ld b,a ld a,[wCurrentMapWidth2] ; map width cp b jr nz,.checkNorthMap ld a,[wMapConn4Ptr] ld [wCurMap],a ld a,[wEastConnectedMapXAlignment] ; new X coordinate upon entering east map ld [wXCoord],a ld a,[wYCoord] ld c,a ld a,[wEastConnectedMapYAlignment] ; Y adjustment upon entering east map add c ld c,a ld [wYCoord],a ld a,[wEastConnectedMapViewPointer] ; pointer to upper left corner of map without adjustment for Y position ld l,a ld a,[wEastConnectedMapViewPointer + 1] ld h,a srl c jr z,.savePointer2 .pointerAdjustmentLoop2 ld a,[wEastConnectedMapWidth] add MAP_BORDER * 2 ld e,a ld d,0 ld b,0 add hl,de dec c jr nz,.pointerAdjustmentLoop2 .savePointer2 ld a,l ld [wCurrentTileBlockMapViewPointer],a ; pointer to upper left corner of current tile block map section ld a,h ld [wCurrentTileBlockMapViewPointer + 1],a jp .loadNewMap .checkNorthMap ld a,[wYCoord] cp $ff jr nz,.checkSouthMap ld a,[wMapConn1Ptr] ld [wCurMap],a ld a,[wNorthConnectedMapYAlignment] ; new Y coordinate upon entering north map ld [wYCoord],a ld a,[wXCoord] ld c,a ld a,[wNorthConnectedMapXAlignment] ; X adjustment upon entering north map add c ld c,a ld [wXCoord],a ld a,[wNorthConnectedMapViewPointer] ; pointer to upper left corner of map without adjustment for X position ld l,a ld a,[wNorthConnectedMapViewPointer + 1] ld h,a ld b,0 srl c add hl,bc ld a,l ld [wCurrentTileBlockMapViewPointer],a ; pointer to upper left corner of current tile block map section ld a,h ld [wCurrentTileBlockMapViewPointer + 1],a jp .loadNewMap .checkSouthMap ld b,a ld a,[wCurrentMapHeight2] cp b jr nz,.didNotEnterConnectedMap ld a,[wMapConn2Ptr] ld [wCurMap],a ld a,[wSouthConnectedMapYAlignment] ; new Y coordinate upon entering south map ld [wYCoord],a ld a,[wXCoord] ld c,a ld a,[wSouthConnectedMapXAlignment] ; X adjustment upon entering south map add c ld c,a ld [wXCoord],a ld a,[wSouthConnectedMapViewPointer] ; pointer to upper left corner of map without adjustment for X position ld l,a ld a,[wSouthConnectedMapViewPointer + 1] ld h,a ld b,0 srl c add hl,bc ld a,l ld [wCurrentTileBlockMapViewPointer],a ; pointer to upper left corner of current tile block map section ld a,h ld [wCurrentTileBlockMapViewPointer + 1],a .loadNewMap ; load the connected map that was entered call LoadMapHeader call PlayDefaultMusicFadeOutCurrent ld b, SET_PAL_OVERWORLD call RunPaletteCommand ; Since the sprite set shouldn't change, this will just update VRAM slots at ; $C2XE without loading any tile patterns. callba InitMapSprites call LoadTileBlockMap jp OverworldLoopLessDelay .didNotEnterConnectedMap jp OverworldLoop ; function to play a sound when changing maps PlayMapChangeSound:: aCoord 8, 8 ; upper left tile of the 4x4 square the player's sprite is standing on cp $0b ; door tile in tileset 0 jr nz,.didNotGoThroughDoor ld a,SFX_GO_INSIDE jr .playSound .didNotGoThroughDoor ld a,SFX_GO_OUTSIDE .playSound call PlaySound ld a,[wMapPalOffset] and a ret nz jp GBFadeOutToBlack CheckIfInOutsideMap:: ; If the player is in an outside map (a town or route), set the z flag ld a, [wCurMapTileset] and a ; most towns/routes have tileset 0 (OVERWORLD) ret z cp PLATEAU ; Route 23 / Indigo Plateau ret ; this function is an extra check that sometimes has to pass in order to warp, beyond just standing on a warp ; the "sometimes" qualification is necessary because of CheckWarpsNoCollision's behavior ; depending on the map, either "function 1" or "function 2" is used for the check ; "function 1" passes when the player is at the edge of the map and is facing towards the outside of the map ; "function 2" passes when the the tile in front of the player is among a certain set ; sets carry if the check passes, otherwise clears carry ExtraWarpCheck:: ld a, [wCurMap] cp SS_ANNE_3 jr z, .useFunction1 cp ROCKET_HIDEOUT_1 jr z, .useFunction2 cp ROCKET_HIDEOUT_2 jr z, .useFunction2 cp ROCKET_HIDEOUT_4 jr z, .useFunction2 cp ROCK_TUNNEL_1 jr z, .useFunction2 ld a, [wCurMapTileset] and a ; outside tileset (OVERWORLD) jr z, .useFunction2 cp SHIP ; S.S. Anne tileset jr z, .useFunction2 cp SHIP_PORT ; Vermilion Port tileset jr z, .useFunction2 cp PLATEAU ; Indigo Plateau tileset jr z, .useFunction2 .useFunction1 ld hl, IsPlayerFacingEdgeOfMap jr .doBankswitch .useFunction2 ld hl, IsWarpTileInFrontOfPlayer .doBankswitch ld b, BANK(IsWarpTileInFrontOfPlayer) jp Bankswitch MapEntryAfterBattle:: callba IsPlayerStandingOnWarp ; for enabling warp testing after collisions ld a,[wMapPalOffset] and a jp z,GBFadeInFromWhite jp LoadGBPal HandleBlackOut:: ; For when all the player's pokemon faint. ; Does not print the "blacked out" message. call GBFadeOutToBlack ld a, $08 call StopMusic ld hl, wd72e res 5, [hl] ld a, Bank(ResetStatusAndHalveMoneyOnBlackout) ; also Bank(SpecialWarpIn) and Bank(SpecialEnterMap) ld [H_LOADEDROMBANK], a ld [MBC1RomBank], a call ResetStatusAndHalveMoneyOnBlackout call SpecialWarpIn call PlayDefaultMusicFadeOutCurrent jp SpecialEnterMap StopMusic:: ld [wAudioFadeOutControl], a ld a, $ff ld [wNewSoundID], a call PlaySound .wait ld a, [wAudioFadeOutControl] and a jr nz, .wait jp StopAllSounds HandleFlyWarpOrDungeonWarp:: call UpdateSprites call Delay3 xor a ld [wBattleResult], a ld [wWalkBikeSurfState], a ld [wIsInBattle], a ld [wMapPalOffset], a ld hl, wd732 set 2, [hl] ; fly warp or dungeon warp res 5, [hl] ; forced to ride bike call LeaveMapAnim ld a, Bank(SpecialWarpIn) ld [H_LOADEDROMBANK], a ld [MBC1RomBank], a call SpecialWarpIn jp SpecialEnterMap LeaveMapAnim:: jpba _LeaveMapAnim LoadPlayerSpriteGraphics:: ; Load sprite graphics based on whether the player is standing, biking, or surfing. ; 0: standing ; 1: biking ; 2: surfing ld a, [wWalkBikeSurfState] dec a jr z, .ridingBike ld a, [hTilesetType] and a jr nz, .determineGraphics jr .startWalking .ridingBike ; If the bike can't be used, ; start walking instead. call IsBikeRidingAllowed jr c, .determineGraphics .startWalking xor a ld [wWalkBikeSurfState], a ld [wWalkBikeSurfStateCopy], a jp LoadWalkingPlayerSpriteGraphics .determineGraphics ld a, [wWalkBikeSurfState] and a jp z, LoadWalkingPlayerSpriteGraphics dec a jp z, LoadBikePlayerSpriteGraphics dec a jp z, LoadSurfingPlayerSpriteGraphics jp LoadWalkingPlayerSpriteGraphics IsBikeRidingAllowed:: ; The bike can be used on Route 23 and Indigo Plateau, ; or maps with tilesets in BikeRidingTilesets. ; Return carry if biking is allowed. ld a, [wCurMap] cp ROUTE_23 jr z, .allowed cp INDIGO_PLATEAU jr z, .allowed ld a, [wCurMapTileset] ld b, a ld hl, BikeRidingTilesets .loop ld a, [hli] cp b jr z, .allowed inc a jr nz, .loop and a ret .allowed scf ret INCLUDE "data/bike_riding_tilesets.asm" ; load the tile pattern data of the current tileset into VRAM LoadTilesetTilePatternData:: ld a,[wTilesetGfxPtr] ld l,a ld a,[wTilesetGfxPtr + 1] ld h,a ld de,vTileset ld bc,$600 ld a,[wTilesetBank] jp FarCopyData2 ; this loads the current maps complete tile map (which references blocks, not individual tiles) to C6E8 ; it can also load partial tile maps of connected maps into a border of length 3 around the current map LoadTileBlockMap:: ; fill C6E8-CBFB with the background tile ld hl,wOverworldMap ld a,[wMapBackgroundTile] ld d,a ld bc,$0514 .backgroundTileLoop ld a,d ld [hli],a dec bc ld a,c or b jr nz,.backgroundTileLoop ; load tile map of current map (made of tile block IDs) ; a 3-byte border at the edges of the map is kept so that there is space for map connections ld hl,wOverworldMap ld a,[wCurMapWidth] ld [hMapWidth],a add MAP_BORDER * 2 ; east and west ld [hMapStride],a ; map width + border ld b,0 ld c,a ; make space for north border (next 3 lines) add hl,bc add hl,bc add hl,bc ld c,MAP_BORDER add hl,bc ; this puts us past the (west) border ld a,[wMapDataPtr] ; tile map pointer ld e,a ld a,[wMapDataPtr + 1] ld d,a ; de = tile map pointer ld a,[wCurMapHeight] ld b,a .rowLoop ; copy one row each iteration push hl ld a,[hMapWidth] ; map width (without border) ld c,a .rowInnerLoop ld a,[de] inc de ld [hli],a dec c jr nz,.rowInnerLoop ; add the map width plus the border to the base address of the current row to get the next row's address pop hl ld a,[hMapStride] ; map width + border add l ld l,a jr nc,.noCarry inc h .noCarry dec b jr nz,.rowLoop .northConnection ld a,[wMapConn1Ptr] cp $ff jr z,.southConnection call SwitchToMapRomBank ld a,[wNorthConnectionStripSrc] ld l,a ld a,[wNorthConnectionStripSrc + 1] ld h,a ld a,[wNorthConnectionStripDest] ld e,a ld a,[wNorthConnectionStripDest + 1] ld d,a ld a,[wNorthConnectionStripWidth] ld [hNorthSouthConnectionStripWidth],a ld a,[wNorthConnectedMapWidth] ld [hNorthSouthConnectedMapWidth],a call LoadNorthSouthConnectionsTileMap .southConnection ld a,[wMapConn2Ptr] cp $ff jr z,.westConnection call SwitchToMapRomBank ld a,[wSouthConnectionStripSrc] ld l,a ld a,[wSouthConnectionStripSrc + 1] ld h,a ld a,[wSouthConnectionStripDest] ld e,a ld a,[wSouthConnectionStripDest + 1] ld d,a ld a,[wSouthConnectionStripWidth] ld [hNorthSouthConnectionStripWidth],a ld a,[wSouthConnectedMapWidth] ld [hNorthSouthConnectedMapWidth],a call LoadNorthSouthConnectionsTileMap .westConnection ld a,[wMapConn3Ptr] cp $ff jr z,.eastConnection call SwitchToMapRomBank ld a,[wWestConnectionStripSrc] ld l,a ld a,[wWestConnectionStripSrc + 1] ld h,a ld a,[wWestConnectionStripDest] ld e,a ld a,[wWestConnectionStripDest + 1] ld d,a ld a,[wWestConnectionStripHeight] ld b,a ld a,[wWestConnectedMapWidth] ld [hEastWestConnectedMapWidth],a call LoadEastWestConnectionsTileMap .eastConnection ld a,[wMapConn4Ptr] cp $ff jr z,.done call SwitchToMapRomBank ld a,[wEastConnectionStripSrc] ld l,a ld a,[wEastConnectionStripSrc + 1] ld h,a ld a,[wEastConnectionStripDest] ld e,a ld a,[wEastConnectionStripDest + 1] ld d,a ld a,[wEastConnectionStripHeight] ld b,a ld a,[wEastConnectedMapWidth] ld [hEastWestConnectedMapWidth],a call LoadEastWestConnectionsTileMap .done ret LoadNorthSouthConnectionsTileMap:: ld c,MAP_BORDER .loop push de push hl ld a,[hNorthSouthConnectionStripWidth] ld b,a .innerLoop ld a,[hli] ld [de],a inc de dec b jr nz,.innerLoop pop hl pop de ld a,[hNorthSouthConnectedMapWidth] add l ld l,a jr nc,.noCarry1 inc h .noCarry1 ld a,[wCurMapWidth] add MAP_BORDER * 2 add e ld e,a jr nc,.noCarry2 inc d .noCarry2 dec c jr nz,.loop ret LoadEastWestConnectionsTileMap:: push hl push de ld c,MAP_BORDER .innerLoop ld a,[hli] ld [de],a inc de dec c jr nz,.innerLoop pop de pop hl ld a,[hEastWestConnectedMapWidth] add l ld l,a jr nc,.noCarry1 inc h .noCarry1 ld a,[wCurMapWidth] add MAP_BORDER * 2 add e ld e,a jr nc,.noCarry2 inc d .noCarry2 dec b jr nz,LoadEastWestConnectionsTileMap ret ; function to check if there is a sign or sprite in front of the player ; if so, it is stored in [hSpriteIndexOrTextID] ; if not, [hSpriteIndexOrTextID] is set to 0 IsSpriteOrSignInFrontOfPlayer:: xor a ld [hSpriteIndexOrTextID],a ld a,[wNumSigns] and a jr z,.extendRangeOverCounter ; if there are signs predef GetTileAndCoordsInFrontOfPlayer ; get the coordinates in front of the player in de ld hl,wSignCoords ld a,[wNumSigns] ld b,a ld c,0 .signLoop inc c ld a,[hli] ; sign Y cp d jr z,.yCoordMatched inc hl jr .retry .yCoordMatched ld a,[hli] ; sign X cp e jr nz,.retry .xCoordMatched ; found sign push hl push bc ld hl,wSignTextIDs ld b,0 dec c add hl,bc ld a,[hl] ld [hSpriteIndexOrTextID],a ; store sign text ID pop bc pop hl ret .retry dec b jr nz,.signLoop ; check if the player is front of a counter in a pokemon center, pokemart, etc. and if so, extend the range at which he can talk to the NPC .extendRangeOverCounter predef GetTileAndCoordsInFrontOfPlayer ; get the tile in front of the player in c ld hl,wTilesetTalkingOverTiles ; list of tiles that extend talking range (counter tiles) ld b,3 ld d,$20 ; talking range in pixels (long range) .counterTilesLoop ld a,[hli] cp c jr z,IsSpriteInFrontOfPlayer2 ; jumps if the tile in front of the player is a counter tile dec b jr nz,.counterTilesLoop ; part of the above function, but sometimes its called on its own, when signs are irrelevant ; the caller must zero [hSpriteIndexOrTextID] IsSpriteInFrontOfPlayer:: ld d,$10 ; talking range in pixels (normal range) IsSpriteInFrontOfPlayer2:: lb bc, $3c, $40 ; Y and X position of player sprite ld a,[wSpriteStateData1 + 9] ; direction the player is facing .checkIfPlayerFacingUp cp SPRITE_FACING_UP jr nz,.checkIfPlayerFacingDown ; facing up ld a,b sub d ld b,a ld a,PLAYER_DIR_UP jr .doneCheckingDirection .checkIfPlayerFacingDown cp SPRITE_FACING_DOWN jr nz,.checkIfPlayerFacingRight ; facing down ld a,b add d ld b,a ld a,PLAYER_DIR_DOWN jr .doneCheckingDirection .checkIfPlayerFacingRight cp SPRITE_FACING_RIGHT jr nz,.playerFacingLeft ; facing right ld a,c add d ld c,a ld a,PLAYER_DIR_RIGHT jr .doneCheckingDirection .playerFacingLeft ; facing left ld a,c sub d ld c,a ld a,PLAYER_DIR_LEFT .doneCheckingDirection ld [wPlayerDirection],a ld a,[wNumSprites] ; number of sprites and a ret z ; if there are sprites ld hl,wSpriteStateData1 + $10 ld d,a ld e,$01 .spriteLoop push hl ld a,[hli] ; image (0 if no sprite) and a jr z,.nextSprite inc l ld a,[hli] ; sprite visibility inc a jr z,.nextSprite inc l ld a,[hli] ; Y location cp b jr nz,.nextSprite inc l ld a,[hl] ; X location cp c jr z,.foundSpriteInFrontOfPlayer .nextSprite pop hl ld a,l add a,$10 ld l,a inc e dec d jr nz,.spriteLoop ret .foundSpriteInFrontOfPlayer pop hl ld a,l and a,$f0 inc a ld l,a ; hl = $c1x1 set 7,[hl] ; set flag to make the sprite face the player ld a,e ld [hSpriteIndexOrTextID],a ret ; function to check if the player will jump down a ledge and check if the tile ahead is passable (when not surfing) ; sets the carry flag if there is a collision, and unsets it if there isn't a collision CollisionCheckOnLand:: ld a,[wd736] bit 6,a ; is the player jumping? jr nz,.noCollision ; if not jumping a ledge ld a,[wSimulatedJoypadStatesIndex] and a jr nz,.noCollision ; no collisions when the player's movements are being controlled by the game ld a,[wPlayerDirection] ; the direction that the player is trying to go in ld d,a ld a,[wSpriteStateData1 + 12] ; the player sprite's collision data (bit field) (set in the sprite movement code) and d ; check if a sprite is in the direction the player is trying to go jr nz,.collision xor a ld [hSpriteIndexOrTextID],a call IsSpriteInFrontOfPlayer ; check for sprite collisions again? when does the above check fail to detect a sprite collision? ld a,[hSpriteIndexOrTextID] and a ; was there a sprite collision? jr nz,.collision ; if no sprite collision ld hl,TilePairCollisionsLand call CheckForJumpingAndTilePairCollisions jr c,.collision call CheckTilePassable jr nc,.noCollision .collision ld a,[wChannelSoundIDs + CH4] cp SFX_COLLISION ; check if collision sound is already playing jr z,.setCarry ld a,SFX_COLLISION call PlaySound ; play collision sound (if it's not already playing) .setCarry scf ret .noCollision and a ret ; function that checks if the tile in front of the player is passable ; clears carry if it is, sets carry if not CheckTilePassable:: predef GetTileAndCoordsInFrontOfPlayer ; get tile in front of player ld a,[wTileInFrontOfPlayer] ; tile in front of player ld c,a ld hl,wTilesetCollisionPtr ; pointer to list of passable tiles ld a,[hli] ld h,[hl] ld l,a ; hl now points to passable tiles .loop ld a,[hli] cp a,$ff jr z,.tileNotPassable cp c ret z jr .loop .tileNotPassable scf ret ; check if the player is going to jump down a small ledge ; and check for collisions that only occur between certain pairs of tiles ; Input: hl - address of directional collision data ; sets carry if there is a collision and unsets carry if not CheckForJumpingAndTilePairCollisions:: push hl predef GetTileAndCoordsInFrontOfPlayer ; get the tile in front of the player push de push bc callba HandleLedges ; check if the player is trying to jump a ledge pop bc pop de pop hl and a ld a,[wd736] bit 6,a ; is the player jumping? ret nz ; if not jumping CheckForTilePairCollisions2:: aCoord 8, 9 ; tile the player is on ld [wTilePlayerStandingOn],a CheckForTilePairCollisions:: ld a,[wTileInFrontOfPlayer] ld c,a .tilePairCollisionLoop ld a,[wCurMapTileset] ; tileset number ld b,a ld a,[hli] cp $ff jr z,.noMatch cp b jr z,.tilesetMatches inc hl .retry inc hl jr .tilePairCollisionLoop .tilesetMatches ld a,[wTilePlayerStandingOn] ; tile the player is on ld b,a ld a,[hl] cp b jr z,.currentTileMatchesFirstInPair inc hl ld a,[hl] cp b jr z,.currentTileMatchesSecondInPair jr .retry .currentTileMatchesFirstInPair inc hl ld a,[hl] cp c jr z,.foundMatch jr .tilePairCollisionLoop .currentTileMatchesSecondInPair dec hl ld a,[hli] cp c inc hl jr nz,.tilePairCollisionLoop .foundMatch scf ret .noMatch and a ret ; FORMAT: tileset number, tile 1, tile 2 ; terminated by 0xFF ; these entries indicate that the player may not cross between tile 1 and tile 2 ; it's mainly used to simulate differences in elevation TilePairCollisionsLand:: db CAVERN, $20, $05 db CAVERN, $41, $05 db FOREST, $30, $2E db CAVERN, $2A, $05 db CAVERN, $05, $21 db FOREST, $52, $2E db FOREST, $55, $2E db FOREST, $56, $2E db FOREST, $20, $2E db FOREST, $5E, $2E db FOREST, $5F, $2E db $FF TilePairCollisionsWater:: db FOREST, $14, $2E db FOREST, $48, $2E db CAVERN, $14, $05 db $FF ; this builds a tile map from the tile block map based on the current X/Y coordinates of the player's character LoadCurrentMapView:: ld a,[H_LOADEDROMBANK] push af ld a,[wTilesetBank] ; tile data ROM bank ld [H_LOADEDROMBANK],a ld [MBC1RomBank],a ; switch to ROM bank that contains tile data ld a,[wCurrentTileBlockMapViewPointer] ; address of upper left corner of current map view ld e,a ld a,[wCurrentTileBlockMapViewPointer + 1] ld d,a ld hl,wTileMapBackup ld b,$05 .rowLoop ; each loop iteration fills in one row of tile blocks push hl push de ld c,$06 .rowInnerLoop ; loop to draw each tile block of the current row push bc push de push hl ld a,[de] ld c,a ; tile block number call DrawTileBlock pop hl pop de pop bc inc hl inc hl inc hl inc hl inc de dec c jr nz,.rowInnerLoop ; update tile block map pointer to next row's address pop de ld a,[wCurMapWidth] add MAP_BORDER * 2 add e ld e,a jr nc,.noCarry inc d .noCarry ; update tile map pointer to next row's address pop hl ld a,$60 add l ld l,a jr nc,.noCarry2 inc h .noCarry2 dec b jr nz,.rowLoop ld hl,wTileMapBackup ld bc,$0000 .adjustForYCoordWithinTileBlock ld a,[wYBlockCoord] and a jr z,.adjustForXCoordWithinTileBlock ld bc,$0030 add hl,bc .adjustForXCoordWithinTileBlock ld a,[wXBlockCoord] and a jr z,.copyToVisibleAreaBuffer ld bc,$0002 add hl,bc .copyToVisibleAreaBuffer coord de, 0, 0 ; base address for the tiles that are directly transferred to VRAM during V-blank ld b, SCREEN_HEIGHT .rowLoop2 ld c, SCREEN_WIDTH .rowInnerLoop2 ld a,[hli] ld [de],a inc de dec c jr nz,.rowInnerLoop2 ld a,$04 add l ld l,a jr nc,.noCarry3 inc h .noCarry3 dec b jr nz,.rowLoop2 pop af ld [H_LOADEDROMBANK],a ld [MBC1RomBank],a ; restore previous ROM bank ret AdvancePlayerSprite:: ld a,[wSpriteStateData1 + 3] ; delta Y ld b,a ld a,[wSpriteStateData1 + 5] ; delta X ld c,a ld hl,wWalkCounter ; walking animation counter dec [hl] jr nz,.afterUpdateMapCoords ; if it's the end of the animation, update the player's map coordinates ld a,[wYCoord] add b ld [wYCoord],a ld a,[wXCoord] add c ld [wXCoord],a .afterUpdateMapCoords ld a,[wWalkCounter] ; walking animation counter cp a,$07 jp nz,.scrollBackgroundAndSprites ; if this is the first iteration of the animation ld a,c cp a,$01 jr nz,.checkIfMovingWest ; moving east ld a,[wMapViewVRAMPointer] ld e,a and a,$e0 ld d,a ld a,e add a,$02 and a,$1f or d ld [wMapViewVRAMPointer],a jr .adjustXCoordWithinBlock .checkIfMovingWest cp a,$ff jr nz,.checkIfMovingSouth ; moving west ld a,[wMapViewVRAMPointer] ld e,a and a,$e0 ld d,a ld a,e sub a,$02 and a,$1f or d ld [wMapViewVRAMPointer],a jr .adjustXCoordWithinBlock .checkIfMovingSouth ld a,b cp a,$01 jr nz,.checkIfMovingNorth ; moving south ld a,[wMapViewVRAMPointer] add a,$40 ld [wMapViewVRAMPointer],a jr nc,.adjustXCoordWithinBlock ld a,[wMapViewVRAMPointer + 1] inc a and a,$03 or a,$98 ld [wMapViewVRAMPointer + 1],a jr .adjustXCoordWithinBlock .checkIfMovingNorth cp a,$ff jr nz,.adjustXCoordWithinBlock ; moving north ld a,[wMapViewVRAMPointer] sub a,$40 ld [wMapViewVRAMPointer],a jr nc,.adjustXCoordWithinBlock ld a,[wMapViewVRAMPointer + 1] dec a and a,$03 or a,$98 ld [wMapViewVRAMPointer + 1],a .adjustXCoordWithinBlock ld a,c and a jr z,.pointlessJump ; mistake? .pointlessJump ld hl,wXBlockCoord ld a,[hl] add c ld [hl],a cp a,$02 jr nz,.checkForMoveToWestBlock ; moved into the tile block to the east xor a ld [hl],a ld hl,wXOffsetSinceLastSpecialWarp inc [hl] ld de,wCurrentTileBlockMapViewPointer call MoveTileBlockMapPointerEast jr .updateMapView .checkForMoveToWestBlock cp a,$ff jr nz,.adjustYCoordWithinBlock ; moved into the tile block to the west ld a,$01 ld [hl],a ld hl,wXOffsetSinceLastSpecialWarp dec [hl] ld de,wCurrentTileBlockMapViewPointer call MoveTileBlockMapPointerWest jr .updateMapView .adjustYCoordWithinBlock ld hl,wYBlockCoord ld a,[hl] add b ld [hl],a cp a,$02 jr nz,.checkForMoveToNorthBlock ; moved into the tile block to the south xor a ld [hl],a ld hl,wYOffsetSinceLastSpecialWarp inc [hl] ld de,wCurrentTileBlockMapViewPointer ld a,[wCurMapWidth] call MoveTileBlockMapPointerSouth jr .updateMapView .checkForMoveToNorthBlock cp a,$ff jr nz,.updateMapView ; moved into the tile block to the north ld a,$01 ld [hl],a ld hl,wYOffsetSinceLastSpecialWarp dec [hl] ld de,wCurrentTileBlockMapViewPointer ld a,[wCurMapWidth] call MoveTileBlockMapPointerNorth .updateMapView call LoadCurrentMapView ld a,[wSpriteStateData1 + 3] ; delta Y cp a,$01 jr nz,.checkIfMovingNorth2 ; if moving south call ScheduleSouthRowRedraw jr .scrollBackgroundAndSprites .checkIfMovingNorth2 cp a,$ff jr nz,.checkIfMovingEast2 ; if moving north call ScheduleNorthRowRedraw jr .scrollBackgroundAndSprites .checkIfMovingEast2 ld a,[wSpriteStateData1 + 5] ; delta X cp a,$01 jr nz,.checkIfMovingWest2 ; if moving east call ScheduleEastColumnRedraw jr .scrollBackgroundAndSprites .checkIfMovingWest2 cp a,$ff jr nz,.scrollBackgroundAndSprites ; if moving west call ScheduleWestColumnRedraw .scrollBackgroundAndSprites ld a,[wSpriteStateData1 + 3] ; delta Y ld b,a ld a,[wSpriteStateData1 + 5] ; delta X ld c,a sla b sla c ld a,[hSCY] add b ld [hSCY],a ; update background scroll Y ld a,[hSCX] add c ld [hSCX],a ; update background scroll X ; shift all the sprites in the direction opposite of the player's motion ; so that the player appears to move relative to them ld hl,wSpriteStateData1 + $14 ld a,[wNumSprites] ; number of sprites and a ; are there any sprites? jr z,.done ld e,a .spriteShiftLoop ld a,[hl] sub b ld [hli],a inc l ld a,[hl] sub c ld [hl],a ld a,$0e add l ld l,a dec e jr nz,.spriteShiftLoop .done ret ; the following four functions are used to move the pointer to the upper left ; corner of the tile block map in the direction of motion MoveTileBlockMapPointerEast:: ld a,[de] add a,$01 ld [de],a ret nc inc de ld a,[de] inc a ld [de],a ret MoveTileBlockMapPointerWest:: ld a,[de] sub a,$01 ld [de],a ret nc inc de ld a,[de] dec a ld [de],a ret MoveTileBlockMapPointerSouth:: add a,MAP_BORDER * 2 ld b,a ld a,[de] add b ld [de],a ret nc inc de ld a,[de] inc a ld [de],a ret MoveTileBlockMapPointerNorth:: add a,MAP_BORDER * 2 ld b,a ld a,[de] sub b ld [de],a ret nc inc de ld a,[de] dec a ld [de],a ret ; the following 6 functions are used to tell the V-blank handler to redraw ; the portion of the map that was newly exposed due to the player's movement ScheduleNorthRowRedraw:: coord hl, 0, 0 call CopyToRedrawRowOrColumnSrcTiles ld a,[wMapViewVRAMPointer] ld [hRedrawRowOrColumnDest],a ld a,[wMapViewVRAMPointer + 1] ld [hRedrawRowOrColumnDest + 1],a ld a,REDRAW_ROW ld [hRedrawRowOrColumnMode],a ret CopyToRedrawRowOrColumnSrcTiles:: ld de,wRedrawRowOrColumnSrcTiles ld c,2 * SCREEN_WIDTH .loop ld a,[hli] ld [de],a inc de dec c jr nz,.loop ret ScheduleSouthRowRedraw:: coord hl, 0, 16 call CopyToRedrawRowOrColumnSrcTiles ld a,[wMapViewVRAMPointer] ld l,a ld a,[wMapViewVRAMPointer + 1] ld h,a ld bc,$0200 add hl,bc ld a,h and $03 or $98 ld [hRedrawRowOrColumnDest + 1],a ld a,l ld [hRedrawRowOrColumnDest],a ld a,REDRAW_ROW ld [hRedrawRowOrColumnMode],a ret ScheduleEastColumnRedraw:: coord hl, 18, 0 call ScheduleColumnRedrawHelper ld a,[wMapViewVRAMPointer] ld c,a and $e0 ld b,a ld a,c add 18 and $1f or b ld [hRedrawRowOrColumnDest],a ld a,[wMapViewVRAMPointer + 1] ld [hRedrawRowOrColumnDest + 1],a ld a,REDRAW_COL ld [hRedrawRowOrColumnMode],a ret ScheduleColumnRedrawHelper:: ld de,wRedrawRowOrColumnSrcTiles ld c,SCREEN_HEIGHT .loop ld a,[hli] ld [de],a inc de ld a,[hl] ld [de],a inc de ld a,19 add l ld l,a jr nc,.noCarry inc h .noCarry dec c jr nz,.loop ret ScheduleWestColumnRedraw:: coord hl, 0, 0 call ScheduleColumnRedrawHelper ld a,[wMapViewVRAMPointer] ld [hRedrawRowOrColumnDest],a ld a,[wMapViewVRAMPointer + 1] ld [hRedrawRowOrColumnDest + 1],a ld a,REDRAW_COL ld [hRedrawRowOrColumnMode],a ret ; function to write the tiles that make up a tile block to memory ; Input: c = tile block ID, hl = destination address DrawTileBlock:: push hl ld a,[wTilesetBlocksPtr] ; pointer to tiles ld l,a ld a,[wTilesetBlocksPtr + 1] ld h,a ld a,c swap a ld b,a and $f0 ld c,a ld a,b and $0f ld b,a ; bc = tile block ID * 0x10 add hl,bc ld d,h ld e,l ; de = address of the tile block's tiles pop hl ld c,$04 ; 4 loop iterations .loop ; each loop iteration, write 4 tile numbers push bc ld a,[de] ld [hli],a inc de ld a,[de] ld [hli],a inc de ld a,[de] ld [hli],a inc de ld a,[de] ld [hl],a inc de ld bc,$0015 add hl,bc pop bc dec c jr nz,.loop ret ; function to update joypad state and simulate button presses JoypadOverworld:: xor a ld [wSpriteStateData1 + 3],a ld [wSpriteStateData1 + 5],a call RunMapScript call Joypad ld a,[wFlags_D733] bit 3,a ; check if a trainer wants a challenge jr nz,.notForcedDownwards ld a,[wCurMap] cp ROUTE_17 ; Cycling Road jr nz,.notForcedDownwards ld a,[hJoyHeld] and D_DOWN | D_UP | D_LEFT | D_RIGHT | B_BUTTON | A_BUTTON jr nz,.notForcedDownwards ld a,D_DOWN ld [hJoyHeld],a ; on the cycling road, if there isn't a trainer and the player isn't pressing buttons, simulate a down press .notForcedDownwards ld a,[wd730] bit 7,a ret z ; if simulating button presses ld a,[hJoyHeld] ld b,a ld a,[wOverrideSimulatedJoypadStatesMask] ; bit mask for button presses that override simulated ones and b ret nz ; return if the simulated button presses are overridden ld hl,wSimulatedJoypadStatesIndex dec [hl] ld a,[hl] cp a,$ff jr z,.doneSimulating ; if the end of the simulated button presses has been reached ld hl,wSimulatedJoypadStatesEnd add l ld l,a jr nc,.noCarry inc h .noCarry ld a,[hl] ld [hJoyHeld],a ; store simulated button press in joypad state and a ret nz ld [hJoyPressed],a ld [hJoyReleased],a ret ; if done simulating button presses .doneSimulating xor a ld [wWastedByteCD3A],a ld [wSimulatedJoypadStatesIndex],a ld [wSimulatedJoypadStatesEnd],a ld [wJoyIgnore],a ld [hJoyHeld],a ld hl,wd736 ld a,[hl] and $f8 ld [hl],a ld hl,wd730 res 7,[hl] ret ; function to check the tile ahead to determine if the character should get on land or keep surfing ; sets carry if there is a collision and clears carry otherwise ; It seems that this function has a bug in it, but due to luck, it doesn't ; show up. After detecting a sprite collision, it jumps to the code that ; checks if the next tile is passable instead of just directly jumping to the ; "collision detected" code. However, it doesn't store the next tile in c, ; so the old value of c is used. 2429 is always called before this function, ; and 2429 always sets c to 0xF0. There is no 0xF0 background tile, so it ; is considered impassable and it is detected as a collision. CollisionCheckOnWater:: ld a,[wd730] bit 7,a jp nz,.noCollision ; return and clear carry if button presses are being simulated ld a,[wPlayerDirection] ; the direction that the player is trying to go in ld d,a ld a,[wSpriteStateData1 + 12] ; the player sprite's collision data (bit field) (set in the sprite movement code) and d ; check if a sprite is in the direction the player is trying to go jr nz,.checkIfNextTileIsPassable ; bug? ld hl,TilePairCollisionsWater call CheckForJumpingAndTilePairCollisions jr c,.collision predef GetTileAndCoordsInFrontOfPlayer ; get tile in front of player (puts it in c and [wTileInFrontOfPlayer]) ld a,[wTileInFrontOfPlayer] ; tile in front of player cp a,$14 ; water tile jr z,.noCollision ; keep surfing if it's a water tile cp a,$32 ; either the left tile of the S.S. Anne boarding platform or the tile on eastern coastlines (depending on the current tileset) jr z,.checkIfVermilionDockTileset cp a,$48 ; tile on right on coast lines in Safari Zone jr z,.noCollision ; keep surfing ; check if the [land] tile in front of the player is passable .checkIfNextTileIsPassable ld hl,wTilesetCollisionPtr ; pointer to list of passable tiles ld a,[hli] ld h,[hl] ld l,a .loop ld a,[hli] cp a,$ff jr z,.collision cp c jr z,.stopSurfing ; stop surfing if the tile is passable jr .loop .collision ld a,[wChannelSoundIDs + CH4] cp SFX_COLLISION ; check if collision sound is already playing jr z,.setCarry ld a,SFX_COLLISION call PlaySound ; play collision sound (if it's not already playing) .setCarry scf jr .done .noCollision and a .done ret .stopSurfing xor a ld [wWalkBikeSurfState],a call LoadPlayerSpriteGraphics call PlayDefaultMusic jr .noCollision .checkIfVermilionDockTileset ld a, [wCurMapTileset] ; tileset cp SHIP_PORT ; Vermilion Dock tileset jr nz, .noCollision ; keep surfing if it's not the boarding platform tile jr .stopSurfing ; if it is the boarding platform tile, stop surfing ; function to run the current map's script RunMapScript:: push hl push de push bc callba TryPushingBoulder ld a,[wFlags_0xcd60] bit 1,a ; play boulder dust animation jr z,.afterBoulderEffect callba DoBoulderDustAnimation .afterBoulderEffect pop bc pop de pop hl call RunNPCMovementScript ld a,[wCurMap] ; current map number call SwitchToMapRomBank ; change to the ROM bank the map's data is in ld hl,wMapScriptPtr ld a,[hli] ld h,[hl] ld l,a ld de,.return push de jp [hl] ; jump to script .return ret LoadWalkingPlayerSpriteGraphics:: ld de,RedSprite ld hl,vNPCSprites jr LoadPlayerSpriteGraphicsCommon LoadSurfingPlayerSpriteGraphics:: ld de,SeelSprite ld hl,vNPCSprites jr LoadPlayerSpriteGraphicsCommon LoadBikePlayerSpriteGraphics:: ld de,RedCyclingSprite ld hl,vNPCSprites LoadPlayerSpriteGraphicsCommon:: push de push hl lb bc, BANK(RedSprite), $0c call CopyVideoData pop hl pop de ld a,$c0 add e ld e,a jr nc,.noCarry inc d .noCarry set 3,h lb bc, BANK(RedSprite), $0c jp CopyVideoData ; function to load data from the map header LoadMapHeader:: callba MarkTownVisitedAndLoadMissableObjects ld a,[wCurMapTileset] ld [wUnusedD119],a ld a,[wCurMap] call SwitchToMapRomBank ld a,[wCurMapTileset] ld b,a res 7,a ld [wCurMapTileset],a ld [hPreviousTileset],a bit 7,b ret nz ld hl,MapHeaderPointers ld a,[wCurMap] sla a jr nc,.noCarry1 inc h .noCarry1 add l ld l,a jr nc,.noCarry2 inc h .noCarry2 ld a,[hli] ld h,[hl] ld l,a ; hl = base of map header ; copy the first 10 bytes (the fixed area) of the map data to D367-D370 ld de,wCurMapTileset ld c,$0a .copyFixedHeaderLoop ld a,[hli] ld [de],a inc de dec c jr nz,.copyFixedHeaderLoop ; initialize all the connected maps to disabled at first, before loading the actual values ld a,$ff ld [wMapConn1Ptr],a ld [wMapConn2Ptr],a ld [wMapConn3Ptr],a ld [wMapConn4Ptr],a ; copy connection data (if any) to WRAM ld a,[wMapConnections] ld b,a .checkNorth bit 3,b jr z,.checkSouth ld de,wMapConn1Ptr call CopyMapConnectionHeader .checkSouth bit 2,b jr z,.checkWest ld de,wMapConn2Ptr call CopyMapConnectionHeader .checkWest bit 1,b jr z,.checkEast ld de,wMapConn3Ptr call CopyMapConnectionHeader .checkEast bit 0,b jr z,.getObjectDataPointer ld de,wMapConn4Ptr call CopyMapConnectionHeader .getObjectDataPointer ld a,[hli] ld [wObjectDataPointerTemp],a ld a,[hli] ld [wObjectDataPointerTemp + 1],a push hl ld a,[wObjectDataPointerTemp] ld l,a ld a,[wObjectDataPointerTemp + 1] ld h,a ; hl = base of object data ld de,wMapBackgroundTile ld a,[hli] ld [de],a .loadWarpData ld a,[hli] ld [wNumberOfWarps],a and a jr z,.loadSignData ld c,a ld de,wWarpEntries .warpLoop ; one warp per loop iteration ld b,$04 .warpInnerLoop ld a,[hli] ld [de],a inc de dec b jr nz,.warpInnerLoop dec c jr nz,.warpLoop .loadSignData ld a,[hli] ; number of signs ld [wNumSigns],a and a ; are there any signs? jr z,.loadSpriteData ; if not, skip this ld c,a ld de,wSignTextIDs ld a,d ld [hSignCoordPointer],a ld a,e ld [hSignCoordPointer + 1],a ld de,wSignCoords .signLoop ld a,[hli] ld [de],a inc de ld a,[hli] ld [de],a inc de push de ld a,[hSignCoordPointer] ld d,a ld a,[hSignCoordPointer + 1] ld e,a ld a,[hli] ld [de],a inc de ld a,d ld [hSignCoordPointer],a ld a,e ld [hSignCoordPointer + 1],a pop de dec c jr nz,.signLoop .loadSpriteData ld a,[wd72e] bit 5,a ; did a battle happen immediately before this? jp nz,.finishUp ; if so, skip this because battles don't destroy this data ld a,[hli] ld [wNumSprites],a ; save the number of sprites push hl ; zero C110-C1FF and C210-C2FF ld hl,wSpriteStateData1 + $10 ld de,wSpriteStateData2 + $10 xor a ld b,$f0 .zeroSpriteDataLoop ld [hli],a ld [de],a inc e dec b jr nz,.zeroSpriteDataLoop ; initialize all C100-C1FF sprite entries to disabled (other than player's) ld hl,wSpriteStateData1 + $12 ld de,$0010 ld c,$0f .disableSpriteEntriesLoop ld [hl],$ff add hl,de dec c jr nz,.disableSpriteEntriesLoop pop hl ld de,wSpriteStateData1 + $10 ld a,[wNumSprites] ; number of sprites and a ; are there any sprites? jp z,.finishUp ; if there are no sprites, skip the rest ld b,a ld c,$00 .loadSpriteLoop ld a,[hli] ld [de],a ; store picture ID at C1X0 inc d ld a,$04 add e ld e,a ld a,[hli] ld [de],a ; store Y position at C2X4 inc e ld a,[hli] ld [de],a ; store X position at C2X5 inc e ld a,[hli] ld [de],a ; store movement byte 1 at C2X6 ld a,[hli] ld [hLoadSpriteTemp1],a ; save movement byte 2 ld a,[hli] ld [hLoadSpriteTemp2],a ; save text ID and flags byte push bc push hl ld b,$00 ld hl,wMapSpriteData add hl,bc ld a,[hLoadSpriteTemp1] ld [hli],a ; store movement byte 2 in byte 0 of sprite entry ld a,[hLoadSpriteTemp2] ld [hl],a ; this appears pointless, since the value is overwritten immediately after ld a,[hLoadSpriteTemp2] ld [hLoadSpriteTemp1],a and a,$3f ld [hl],a ; store text ID in byte 1 of sprite entry pop hl ld a,[hLoadSpriteTemp1] bit 6,a jr nz,.trainerSprite bit 7,a jr nz,.itemBallSprite jr .regularSprite .trainerSprite ld a,[hli] ld [hLoadSpriteTemp1],a ; save trainer class ld a,[hli] ld [hLoadSpriteTemp2],a ; save trainer number (within class) push hl ld hl,wMapSpriteExtraData add hl,bc ld a,[hLoadSpriteTemp1] ld [hli],a ; store trainer class in byte 0 of the entry ld a,[hLoadSpriteTemp2] ld [hl],a ; store trainer number in byte 1 of the entry pop hl jr .nextSprite .itemBallSprite ld a,[hli] ld [hLoadSpriteTemp1],a ; save item number push hl ld hl,wMapSpriteExtraData add hl,bc ld a,[hLoadSpriteTemp1] ld [hli],a ; store item number in byte 0 of the entry xor a ld [hl],a ; zero byte 1, since it is not used pop hl jr .nextSprite .regularSprite push hl ld hl,wMapSpriteExtraData add hl,bc ; zero both bytes, since regular sprites don't use this extra space xor a ld [hli],a ld [hl],a pop hl .nextSprite pop bc dec d ld a,$0a add e ld e,a inc c inc c dec b jp nz,.loadSpriteLoop .finishUp predef LoadTilesetHeader callab LoadWildData pop hl ; restore hl from before going to the warp/sign/sprite data (this value was saved for seemingly no purpose) ld a,[wCurMapHeight] ; map height in 4x4 tile blocks add a ; double it ld [wCurrentMapHeight2],a ; store map height in 2x2 tile blocks ld a,[wCurMapWidth] ; map width in 4x4 tile blocks add a ; double it ld [wCurrentMapWidth2],a ; map width in 2x2 tile blocks ld a,[wCurMap] ld c,a ld b,$00 ld a,[H_LOADEDROMBANK] push af ld a, BANK(MapSongBanks) ld [H_LOADEDROMBANK],a ld [MBC1RomBank],a ld hl, MapSongBanks add hl,bc add hl,bc ld a,[hli] ld [wMapMusicSoundID],a ; music 1 ld a,[hl] ld [wMapMusicROMBank],a ; music 2 pop af ld [H_LOADEDROMBANK],a ld [MBC1RomBank],a ret ; function to copy map connection data from ROM to WRAM ; Input: hl = source, de = destination CopyMapConnectionHeader:: ld c,$0b .loop ld a,[hli] ld [de],a inc de dec c jr nz,.loop ret ; function to load map data LoadMapData:: ld a,[H_LOADEDROMBANK] push af call DisableLCD ld a,$98 ld [wMapViewVRAMPointer + 1],a xor a ld [wMapViewVRAMPointer],a ld [hSCY],a ld [hSCX],a ld [wWalkCounter],a ld [wUnusedD119],a ld [wWalkBikeSurfStateCopy],a ld [wSpriteSetID],a call LoadTextBoxTilePatterns call LoadMapHeader callba InitMapSprites ; load tile pattern data for sprites call LoadTileBlockMap call LoadTilesetTilePatternData call LoadCurrentMapView ; copy current map view to VRAM coord hl, 0, 0 ld de,vBGMap0 ld b,18 .vramCopyLoop ld c,20 .vramCopyInnerLoop ld a,[hli] ld [de],a inc e dec c jr nz,.vramCopyInnerLoop ld a,32 - 20 add e ld e,a jr nc,.noCarry inc d .noCarry dec b jr nz,.vramCopyLoop ld a,$01 ld [wUpdateSpritesEnabled],a call EnableLCD ld b, SET_PAL_OVERWORLD call RunPaletteCommand call LoadPlayerSpriteGraphics ld a,[wd732] and a,1 << 4 | 1 << 3 ; fly warp or dungeon warp jr nz,.restoreRomBank ld a,[wFlags_D733] bit 1,a jr nz,.restoreRomBank call UpdateMusic6Times call PlayDefaultMusicFadeOutCurrent .restoreRomBank pop af ld [H_LOADEDROMBANK],a ld [MBC1RomBank],a ret ; function to switch to the ROM bank that a map is stored in ; Input: a = map number SwitchToMapRomBank:: push hl push bc ld c,a ld b,$00 ld a,Bank(MapHeaderBanks) call BankswitchHome ; switch to ROM bank 3 ld hl,MapHeaderBanks add hl,bc ld a,[hl] ld [$ffe8],a ; save map ROM bank call BankswitchBack ld a,[$ffe8] ld [H_LOADEDROMBANK],a ld [MBC1RomBank],a ; switch to map ROM bank pop bc pop hl ret IgnoreInputForHalfSecond: ld a, 30 ld [wIgnoreInputCounter], a ld hl, wd730 ld a, [hl] or %00100110 ld [hl], a ; set ignore input bit ret ResetUsingStrengthOutOfBattleBit: ld hl, wd728 res 0, [hl] ret ForceBikeOrSurf:: ld b, BANK(RedSprite) ld hl, LoadPlayerSpriteGraphics call Bankswitch jp PlayDefaultMusic ; update map/player state?