ref: 17eaf761e38cea827320f984cfaaa1527276ab15
dir: /engine/overworld/push_boulder.asm/
TryPushingBoulder:: ld a, [wd728] bit 0, a ; using Strength? ret z ld a, [wFlags_0xcd60] bit 1, a ; has boulder dust animation from previous push played yet? ret nz xor a ldh [hSpriteIndexOrTextID], a call IsSpriteInFrontOfPlayer ldh a, [hSpriteIndexOrTextID] ld [wBoulderSpriteIndex], a and a jp z, ResetBoulderPushFlags ld hl, wSpritePlayerStateData1MovementStatus ld d, $0 ldh a, [hSpriteIndexOrTextID] swap a ld e, a add hl, de res 7, [hl] call GetSpriteMovementByte2Pointer ld a, [hl] cp BOULDER_MOVEMENT_BYTE_2 jp nz, ResetBoulderPushFlags ld hl, wFlags_0xcd60 bit 6, [hl] set 6, [hl] ; indicate that the player has tried pushing ret z ; the player must try pushing twice before the boulder will move ldh a, [hJoyHeld] and D_RIGHT | D_LEFT | D_UP | D_DOWN ret z predef CheckForCollisionWhenPushingBoulder ld a, [wTileInFrontOfBoulderAndBoulderCollisionResult] and a ; was there a collision? jp nz, ResetBoulderPushFlags ldh a, [hJoyHeld] ld b, a ld a, [wSpritePlayerStateData1FacingDirection] cp SPRITE_FACING_UP jr z, .pushBoulderUp cp SPRITE_FACING_LEFT jr z, .pushBoulderLeft cp SPRITE_FACING_RIGHT jr z, .pushBoulderRight .pushBoulderDown bit 7, b ret z ld de, PushBoulderDownMovementData jr .done .pushBoulderUp bit 6, b ret z ld de, PushBoulderUpMovementData jr .done .pushBoulderLeft bit 5, b ret z ld de, PushBoulderLeftMovementData jr .done .pushBoulderRight bit 4, b ret z ld de, PushBoulderRightMovementData .done call MoveSprite ld a, SFX_PUSH_BOULDER call PlaySound ld hl, wFlags_0xcd60 set 1, [hl] ret PushBoulderUpMovementData: db NPC_MOVEMENT_UP db -1 ; end PushBoulderDownMovementData: db NPC_MOVEMENT_DOWN db -1 ; end PushBoulderLeftMovementData: db NPC_MOVEMENT_LEFT db -1 ; end PushBoulderRightMovementData: db NPC_MOVEMENT_RIGHT db -1 ; end DoBoulderDustAnimation:: ld a, [wd730] bit 0, a ret nz callfar AnimateBoulderDust call DiscardButtonPresses ld [wJoyIgnore], a call ResetBoulderPushFlags set 7, [hl] ld a, [wBoulderSpriteIndex] ldh [hSpriteIndex], a call GetSpriteMovementByte2Pointer ld [hl], $10 ld a, SFX_CUT jp PlaySound ResetBoulderPushFlags: ld hl, wFlags_0xcd60 res 1, [hl] res 6, [hl] ret