diff options
Diffstat (limited to 'engine/pikachu_follow.asm')
| -rwxr-xr-x | engine/pikachu_follow.asm | 1578 |
1 files changed, 1578 insertions, 0 deletions
diff --git a/engine/pikachu_follow.asm b/engine/pikachu_follow.asm new file mode 100755 index 00000000..b5791919 --- /dev/null +++ b/engine/pikachu_follow.asm @@ -0,0 +1,1578 @@ +ShouldPikachuSpawn:: +; possibly to test if pika should be out? + ld a, [wPikachuOverworldStateFlags] + bit 5, a + jr nz, .hide ; 3f:44f8 + ld a, [wPikachuOverworldStateFlags] + bit 7, a + jr nz, .hide + call IsStarterPikachuInOurParty + jr nc, .hide + ld a, [wWalkBikeSurfState] + and a + jr nz, .hide + scf + ret + +.hide + and a + ret + +SchedulePikachuSpawnForAfterText:: + ld hl, wPikachuOverworldStateFlags + bit 4, [hl] + res 4, [hl] + jr nz, .normal_spawn_state + call EnablePikachuFollowingPlayer + call ClearPikachuSpriteStateData + ld a, $ff + ld [wPikachuSpriteImageIdx], a + call ClearPikachuFollowCommandBuffer + call CalculatePikachuFacingDirection + ret + +.normal_spawn_state + call CalculatePikachuPlacementCoords + xor a + ld [wPikachuSpawnState], a + ld a, [wPlayerFacingDirection] + ld [wPikachuFacingDirection], a + ret + +ClearPikachuSpriteStateData:: + ld hl, wPikachuPictureID + call .clear + ld hl, wPikachuSpriteStateData2 +.clear + ld bc, $10 + xor a + call FillMemory + ret + +CalculatePikachuSpawnCoordsAndFacing:: + call CalculatePikachuPlacementCoords + call CalculatePikachuFacingDirection + xor a + ld [wPikachuSpawnState], a + ret + +CalculatePikachuPlacementCoords:: + ld bc, wPikachuPictureID + ld a, [wYCoord] + add $4 + ld e, a + ld a, [wXCoord] + add $4 + ld d, a + ld a, [wPikachuSpawnState] + and a + jr z, .load_coords + cp $1 + jr z, .right_of_player + cp $2 + jr z, .check_player_facing2 + cp $3 + jr z, .load_coords + cp $4 + jr z, .below_player + cp $5 + jr z, .above_player + cp $6 + jr z, .left_of_player + cp $7 + jr z, .check_player_facing + jr .right_of_player + +.check_player_facing + ld a, [wPlayerFacingDirection] + and a ; SPRITE_FACING_DOWN + jr z, .below_player + cp SPRITE_FACING_UP + jr z, .above_player + cp SPRITE_FACING_LEFT + jr z, .left_of_player + cp SPRITE_FACING_RIGHT + jr z, .right_of_player +.check_player_facing2 + ld a, [wPlayerFacingDirection] + and a + jr nz, .check_up + dec e + jr .load_coords + +.check_up + cp SPRITE_FACING_UP + jr nz, .check_left + inc e + jr .load_coords + +.check_left + cp SPRITE_FACING_LEFT + jr nz, .left_of_player_2 + inc d + jr .load_coords + +.left_of_player_2 + dec d + jr .load_coords + +.right_of_player + inc d + jr .load_coords + +.left_of_player + dec d + jr .load_coords + +.below_player + inc e + jr .load_coords + +.above_player + dec e + jr .load_coords ; useless jr +.load_coords + ld hl, wPlayerMapY - wPlayerSpriteStateData1 + add hl, bc + ld [hl], e + inc hl + ld [hl], d + inc hl + ld [hl], $fe + push hl + ld hl, wd472 + set 5, [hl] + pop hl + ret + +CalculatePikachuFacingDirection:: + ld a, $49 + ld [wPikachuPictureID], a + ld a, $ff + ld [wPikachuSpriteImageIdx], a + ld a, [wPikachuSpawnState] + and a + jr z, .copy_player_facing + cp $1 + jr z, .copy_player_facing + cp $3 + jr z, .force_facing_down + cp $4 + jr z, .copy_player_facing + cp $6 + jr z, .copy_player_facing + cp $7 + jr z, .face_the_other_way + call ComputePikachuFacingDirection + ret + +.copy_player_facing + ld a, [wPlayerFacingDirection] + ld [wPikachuFacingDirection], a + ret + +.force_facing_down + ld a, SPRITE_FACING_DOWN + ld [wPikachuFacingDirection], a + ret + +.face_the_other_way + ld a, [wPlayerFacingDirection] + xor $4 + ld [wPikachuFacingDirection], a + ret + +CalculatePikachuSpawnState1:: + ld a, [wCurMap] + cp OAKS_LAB + jr z, .oaks_lab + cp ROUTE_22_GATE + jr z, .route_22_gate + cp MT_MOON_2 + jr z, .mt_moon_2 + cp ROCK_TUNNEL_1 + jr z, .rock_tunnel_1 + ld a, [wCurMap] + ld hl, Pointer_fc64b + call Pikachu_IsInArray ; similar to IsInArray, but not the same + jr c, .map_list_1 + ld a, [wCurMap] + ld hl, Pointer_fc653 + call Pikachu_IsInArray + jr nc, .not_map_list_2 + ld a, [wPlayerFacingDirection] + and a + jr nz, .not_map_list_2 + ld a, $3 + jr .load + +.route_22_gate + ld a, [wPlayerFacingDirection] + and a + jr z, .rock_tunnel_1 + jr .not_map_list_2 + +.mt_moon_2 + ld a, $3 + jr .load + +.map_list_1 + ld a, $4 + jr .load + +.oaks_lab + ld a, $6 + jr .load + +.not_map_list_2 + ld a, $1 + jr .load + +.rock_tunnel_1 + ld a, $3 +.load + ld [wPikachuSpawnState], a + ret + +Pointer_fc64b:: + db VICTORY_ROAD_2 + db ROUTE_7_GATE + db ROUTE_8_GATE + db ROUTE_16_GATE_1F + db ROUTE_18_GATE_1F + db ROUTE_15_GATE_1F + db ROUTE_11_GATE_1F + db $ff + +Pointer_fc653:: + db VIRIDIAN_FOREST_EXIT + db CERULEAN_HOUSE_2 + db TRASHED_HOUSE + db VERMILION_DOCK + db CELADON_MANSION_1 + db ROUTE_2_GATE + db FUCHSIA_HOUSE_3 + db $ff + +CalculatePikachuSpawnState2:: + ld a, [wCurMap] + cp VIRIDIAN_FOREST_EXIT + jr z, .viridian_forest_exit + cp VIRIDIAN_FOREST_ENTRANCE + jr z, .viridian_forest_entrance + ld a, [wCurMap] + ld hl, Pointer_fc68e + call Pikachu_IsInArray + jr c, .in_array + jr .not_in_array + +.viridian_forest_exit + ld a, [wPlayerFacingDirection] + cp SPRITE_FACING_UP + jr z, .in_array + jr .not_in_array + +.viridian_forest_entrance + ld a, [wPlayerFacingDirection] + and a ; SPRITE_FACING_DOWN + jr z, .not_in_array + jr .in_array + +.not_in_array + ld a, $0 + jr .load_spawn_state + +.in_array + ld a, $1 +.load_spawn_state + ld [wPikachuSpawnState], a + ret + +Pointer_fc68e:: + db VIRIDIAN_FOREST + db SAFARI_ZONE_REST_HOUSE_1 + db SAFARI_ZONE_REST_HOUSE_2 + db SAFARI_ZONE_REST_HOUSE_3 + db SAFARI_ZONE_REST_HOUSE_4 + db SAFARI_ZONE_SECRET_HOUSE + db SILPH_CO_ELEVATOR + db CELADON_MART_ELEVATOR + db CINNABAR_LAB_2 + db CINNABAR_LAB_3 + db CINNABAR_LAB_4 + db $ff + +CalculatePikachuSpawnState3:: + ld a, [wCurMap] + cp ROUTE_22_GATE + jr z, .asm_fc6a7 + cp ROUTE_2_GATE + jr z, .asm_fc6b0 + jr .asm_fc6bd + +.asm_fc6a7 + ld a, [wPlayerFacingDirection] + cp SPRITE_FACING_UP + jr z, .asm_fc6b9 + jr .asm_fc6bd + +.asm_fc6b0 + ld a, [wPlayerFacingDirection] + cp SPRITE_FACING_UP + jr z, .asm_fc6b9 + jr .asm_fc6bd + +.asm_fc6b9 + ld a, $1 + jr .asm_fc6c1 + +.asm_fc6bd + ld a, $3 + jr .asm_fc6c1 + +.asm_fc6c1 + ld [wPikachuSpawnState], a + ret + +SetPikachuOverworldStateFlag2:: + push hl + ld hl, wPikachuOverworldStateFlags + set 2, [hl] + pop hl + ret + +ResetPikachuOverworldStateFlag2:: + push hl + ld hl, wPikachuOverworldStateFlags + res 2, [hl] + pop hl + ret + +SpawnPikachu_:: + call ResetPikachuOverworldStateFlag2 + call TrySpawnPikachu + ret nc + + push bc + call WillPikachuSpawnOnTheScreen + pop bc + ret c + + ld bc, wPikachuSpriteStateData1 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + bit 7, [hl] + jp nz, Func_fc745 + ld a, [wFontLoaded] + bit 0, a + jp nz, Func_fc76a + call CheckPikachuFollowingPlayer + jp nz, Func_fc76a + ld a, [hl] + and $7f + cp $a + jr c, .valid + xor a +.valid + add a + ld e, a + ld d, 0 + ld hl, PointerTable_fc710 + add hl, de + ld a, [hli] + ld h, [hl] + ld l, a + jp hl + +PointerTable_fc710: + dw Func_fc793 + dw Func_fc7aa + dw Func_fc803 + dw asm_fc9c3 + dw asm_fca1c + dw asm_fc9ee + dw asm_fc87f + dw asm_fc904 + dw asm_fc937 + dw asm_fc969 + dw .nop + +.nop: + ret + +TrySpawnPikachu: + call ShouldPikachuSpawn + jr nc, .dont_spawn + ld a, [wPikachuMovementStatus] + and a + jr nz, .already_spawned + push bc + push hl + call CalculatePikachuSpawnCoordsAndFacing + pop hl + pop bc +.already_spawned + scf + ret + +.dont_spawn + ld hl, wPikachuSpriteImageIdx + ld [hl], $ff + dec hl + ld [hl], $0 + xor a + ret + +Func_fc745: + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + res 7, [hl] + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a + call CheckPikachuFollowingPlayer + jr nz, .okay + ; Have Pikachu face in the opposite direction of you + ld a, [wPlayerFacingDirection] + xor $4 + ld hl, wPikachuFacingDirection - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a +.okay + xor a + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hli], a + ld [hl], a + call UpdatePikachuWalkingSprite + ret + +Func_fc76a: + xor a + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hli], a + ld [hl], a + call UpdatePikachuWalkingSprite + call Func_fc82e + jr c, .skip + push bc + callab InitializeSpriteScreenPosition + pop bc +.skip + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $1 + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $0 + call RefreshPikachuFollow + ret + +Func_fc793: + call RefreshPikachuFollow + push bc + callab InitializeSpriteScreenPosition + pop bc + ld hl, wPikachuSpriteImageIdx - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $ff + dec hl + ld [hl], $1 + ret + +Func_fc7aa: + call Func_fcc92 + jp c, Func_fc803 + dec a + ld l, a + ld h, $0 + add hl, hl + add hl, hl + ld de, Pointer_fc7e3 + add hl, de + ld d, h + ld e, l + ld a, [de] + inc de + ld hl, wPikachuFacingDirection - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a + ld a, [de] + inc de + ld hl, wPikachuXStepVector - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a + dec hl + dec hl + ld a, [de] + ld [hl], a + inc de + ld a, [de] + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a + cp $4 + jp z, Func_fca0a + call AreThereAtLeastTwoStepsInPikachuFollowCommandBuffer + jp c, FastPikachuFollow + jp NormalPikachuFollow + +Pointer_fc7e3: + db 0, 0 + db 1, 3 + db 4, 0 + db -1, 3 + db 8, -1 + db 0, 3 + db 12, 1 + db 0, 3 + db 0, 0 + db 1, 4 + db 4, 0 + db -1, 4 + db 8, -1 + db 0, 4 + db 12, 1 + db 0, 4 + +Func_fc803: + call Func_fcae2 + ret c + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + jr nz, .asm_fc823 + push hl + call GetPikachuFollowCommand + pop hl + cp $5 + jr nc, Func_fc842 + ld [hl], $20 + call Random + and $c + ld hl, wPikachuFacingDirection - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a +.asm_fc823 + xor a + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hli], a + ld [hl], a + call UpdatePikachuWalkingSprite + ret + +Func_fc82e: + ld a, [wWalkCounter] + and a + ret z + scf + ret + +Func_fc835: + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $10 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $1 + ret + +Func_fc842: + ld hl, $0 + push af + call Random + ld a, [hRandomAdd] + and %11 + ld e, a + ld d, $0 + ld hl, PointerTable_fc85a + add hl, de + add hl, de + ld a, [hli] + ld h, [hl] + ld l, a + pop af + jp hl + +PointerTable_fc85a: + dw Func_fc862 + dw Func_fc8f8 + dw Func_fc92b + dw Func_fc95d + +Func_fc862: + dec a + add a + add a + and $c + ld hl, wPikachuFacingDirection - wPikachuSpriteStateData1 + add hl, bc + ld [hl], a + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $6 + xor a + ld [wd432], a + ld [wd433], a + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $11 +asm_fc87f: + ld a, [wd432] + ld e, a + ld a, [wd433] + ld d, a + call Func_fc82e + jr c, Func_fc8c7 + call SetPikachuOverworldStateFlag2 + ld hl, wPikachuYPixels - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + sub e + ld e, a + inc hl + inc hl + ld a, [hl] + sub d + ld d, a + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + dec a + add a + add Pointer_fc8d6 % $100 + ld l, a + ld a, Pointer_fc8d6 / $100 + adc $0 + ld h, a + ld a, [hli] + ld [wd432], a + add e + ld e, a + ld a, [hl] + ld [wd433], a + add d + ld d, a + ld hl, wPikachuYPixels - wPikachuSpriteStateData1 + add hl, bc + ld [hl], e + inc hl + inc hl + ld [hl], d + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + jp Func_fc835 + +Func_fc8c7: + ld hl, wPikachuYPixels - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + sub e + ld [hl], a + inc hl + inc hl + ld a, [hl] + sub d + ld [hl], a + jp Func_fc835 + +Pointer_fc8d6: + db 0, 0 + db -2, 1 + db -4, 2 + db -2, 3 + db 0, 4 + db -2, 3 + db -4, 2 + db -2, 1 + db 0, 0 + db -2, -1 + db -4, -2 + db -2, -3 + db 0, -4 + db -2, -3 + db -4, -2 + db -2, -1 + db 0, 0 + +Func_fc8f8: + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $7 + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $30 +asm_fc904: + call Func_fc82e + jp c, Func_fc835 + call SetPikachuOverworldStateFlag2 + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + inc a + cp $8 + ld [hl], a + jr nz, .asm_fc91f + xor a + ld [hli], a + ld a, [hl] + inc a + and %11 + ld [hl], a +.asm_fc91f + call UpdatePikachuWalkingSprite + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + jp Func_fc835 + +Func_fc92b: + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $20 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $8 +asm_fc937: + call Func_fc82e + jp c, Func_fc835 + call SetPikachuOverworldStateFlag2 + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + inc a + cp $8 + ld [hl], a + jr nz, .asm_fc951 + xor a + ld [hli], a + ld a, [hl] + xor $1 + ld [hl], a +.asm_fc951 + call UpdatePikachuWalkingSprite + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + jp Func_fc835 + +Func_fc95d: + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $20 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $9 +asm_fc969: + call Func_fc82e + jp c, Func_fc835 + call SetPikachuOverworldStateFlag2 + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + inc a + cp $8 + ld [hl], a + jr nz, .skip + xor a + ld [hl], a + ld hl, wPikachuFacingDirection - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + call .TurnClockwise + ld [hl], a +.skip + call UpdatePikachuWalkingSprite + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + jp Func_fc835 + +.TurnClockwise: + push hl + ld hl, .Facings + ld d, a +.loop + ld a, [hli] + cp d + jr nz, .loop + ld a, [hl] + pop hl + ret + +.TurnCounterclockwise: + push hl + ld hl, .Facings_End + ld d, a +.loop_ + ld a, [hld] + cp d + jr nz, .loop_ + ld a, [hl] + pop hl + ret + +.Facings: + db SPRITE_FACING_DOWN, SPRITE_FACING_LEFT, SPRITE_FACING_UP, SPRITE_FACING_RIGHT + db SPRITE_FACING_DOWN, SPRITE_FACING_LEFT, SPRITE_FACING_UP, SPRITE_FACING_RIGHT +.Facings_End: + +NormalPikachuFollow: + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $8 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $3 + call AddPikachuStepVector +asm_fc9c3: + call TryDoubleAddPikachuStepVectorToScreenPixelCoords + call GetPikachuWalkingAnimationSpeed + call UpdatePikachuWalkingSprite + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + call ResetPikachuStepVector + call ComputePikachuFacingDirection + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $1 + ret + +FastPikachuFollow: + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $4 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $5 + call AddPikachuStepVector +asm_fc9ee: + call DoubleAddPikachuStepVectorToScreenPixelCoords + call GetPikachuWalkingAnimationSpeed + call UpdatePikachuWalkingSprite + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + call ResetPikachuStepVector + call ComputePikachuFacingDirection + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $1 + ret + +Func_fca0a: + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $8 + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $4 + call AddPikachuStepVector + call AddPikachuStepVector +asm_fca1c: + call DoubleAddPikachuStepVectorToScreenPixelCoords + call GetPikachuWalkingAnimationSpeed + call UpdatePikachuWalkingSprite + ld hl, wPikachuWalkAnimationCounter - wPikachuSpriteStateData1 + add hl, bc + dec [hl] + ret nz + call ResetPikachuStepVector + call ComputePikachuFacingDirection + ld hl, wPikachuMovementStatus - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $1 + ret + +AddPikachuStepVector: + ld hl, wPikachuYStepVector - wPikachuSpriteStateData1 + add hl, bc + ld e, [hl] + inc hl + inc hl + ld d, [hl] + ld hl, wPikachuMapY - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + add e + ld [hli], a + ld a, [hl] + add d + ld [hl], a + ret + +TryDoubleAddPikachuStepVectorToScreenPixelCoords: + ld a, [wWalkBikeSurfState] + cp $1 ; biking + jr nz, AddPikachuStepVectorToScreenPixelCoords + ld a, [wd736] + bit 6, a + jr nz, AddPikachuStepVectorToScreenPixelCoords +DoubleAddPikachuStepVectorToScreenPixelCoords: + ld hl, wPikachuYStepVector - wPikachuSpriteStateData1 + add hl, bc + ld a, [hli] + add a + add a + add [hl] + ld [hli], a + ld a, [hli] + add a + add a + add [hl] + ld [hl], a + ret + +AddPikachuStepVectorToScreenPixelCoords: + ld hl, wPikachuYStepVector - wPikachuSpriteStateData1 + add hl, bc + ld a, [hli] + add a + add [hl] + ld [hli], a + ld a, [hli] + add a + add [hl] + ld [hli], a + ret + +ResetPikachuStepVector: + ld hl, wPikachuYStepVector - wPikachuSpriteStateData1 + add hl, bc + xor a + ld [hli], a + inc hl + ld [hl], a + ret + +GetPikachuWalkingAnimationSpeed: + call ComparePikachuHappinessTo80 + ld d, $2 + jr nc, .happy + ld d, $5 +.happy + ld hl, wPikachuIntraAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + inc a + cp d + jr nz, .dont_reset + xor a +.dont_reset + ld [hli], a + ret nz + ld a, [hl] + inc a + and $3 + ld [hl], a + ret + +UpdatePikachuWalkingSprite: + ld a, [wPikachuOverworldStateFlags] + bit 3, a + jr nz, .uninitialized + ld hl, wPikachuSpriteImageBaseOffset - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + dec a + swap a + ld d, a + ld a, [wd736] + bit 7, a + jr nz, .copy_player + ld hl, wPikachuFacingDirection - wPikachuSpriteStateData1 + add hl, bc + ld a, [hl] + or d + ld d, a + ld a, [wFontLoaded] + bit 0, a + jr z, .normal_get_sprite_index + call Func_fcae2 + ret c + jr .load_sprite_index + +.normal_get_sprite_index + ld hl, wPikachuAnimFrameCounter - wPikachuSpriteStateData1 + add hl, bc + ld a, d + or [hl] + ld d, a +.load_sprite_index + ld hl, wPikachuSpriteImageIdx - wPikachuSpriteStateData1 + add hl, bc + ld [hl], d + ret + +.uninitialized + ld hl, wPikachuSpriteImageIdx - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $ff + ret + +.copy_player + ld a, [wPlayerSpriteImageIdx] + and $f + or d + ld [wPikachuSpriteImageIdx], a + ret + +Func_fcae2: + ld hl, wPikachuMapY - wPikachuSpriteStateData1 + add hl, bc + ld a, [wYCoord] + add $4 + cp [hl] + jr nz, .on_screen + inc hl + ld a, [wXCoord] + add $4 + cp [hl] + jr nz, .on_screen + ld hl, wPikachuSpriteImageIdx - wPikachuSpriteStateData1 + add hl, bc + ld [hl], $ff + scf + ret + +.on_screen + and a + ret + +IsPikachuRightNextToPlayer: + push bc + push de + push hl + ld bc, wPikachuPictureID + ld a, [wXCoord] + add $4 + ld d, a + ld a, [wYCoord] + add $4 + ld e, a + ld hl, wPlayerMapY - wPlayerSpriteStateData1 + add hl, bc + ld a, [hl] + sub e + and a + jr z, .equal + cp $ff + jr z, .one_away + cp $1 + jr z, .one_away + jr .bad + +.one_away + ld hl, wPlayerMapX - wPlayerSpriteStateData1 + add hl, bc + ld a, [hl] + sub d + jr z, .good + jr .bad + +.equal + ld hl, wPlayerMapX - wPlayerSpriteStateData1 + add hl, bc + ld a, [hl] + sub d + cp $ff + jr z, .good + cp $1 + jr z, .good + and a + jr z, .good + jr .bad + +.good + pop hl + pop de + pop bc + scf + ret + +.bad + pop hl + pop de + pop bc + xor a + ret + +GetPikachuFacingDirectionAndReturnToE: + call GetPikachuFacingDirection + ld e, a + ret + +GetPikachuFacingDirection: + ld bc, wPikachuPictureID + ld a, [wXCoord] + add $4 + ld d, a + ld a, [wYCoord] + add $4 + ld e, a + ld hl, wPlayerMapY - wPlayerSpriteStateData1 + add hl, bc + ld a, [hl] + cp e + jr z, .asm_fcb71 + jr nc, .asm_fcb6e + ld a, SPRITE_FACING_UP + ret + +.asm_fcb6e + ld a, SPRITE_FACING_DOWN + ret + +.asm_fcb71 + ld hl, wPlayerMapX - wPlayerSpriteStateData1 + add hl, bc + ld a, [hl] + cp d + jr z, .asm_fcb81 + jr nc, .asm_fcb7e + ld a, SPRITE_FACING_LEFT + ret + +.asm_fcb7e + ld a, SPRITE_FACING_RIGHT + ret + +.asm_fcb81 + ld a, $ff ; standing + ret + +ClearPikachuFollowCommandBuffer: + push bc + ld hl, wPikachuFollowCommandBufferSize + ld [hl], $ff + inc hl + ld bc, $10 + xor a + call FillMemory + pop bc + ret + +AppendPikachuFollowCommandToBuffer: + ld hl, wPikachuFollowCommandBufferSize + inc [hl] + ld e, [hl] + ld d, 0 + ld hl, wPikachuFollowCommandBuffer + add hl, de + ld [hl], a + ret + +RefreshPikachuFollow: + call ClearPikachuFollowCommandBuffer + call ComputePikachuFollowCommand + ret c + call AppendPikachuFollowCommandToBuffer + ret + +ComputePikachuFollowCommand: + ld bc, wPikachuPictureID + ld hl, wPlayerMapY - wPlayerSpriteStateData1 + add hl, bc + ld a, [wYCoord] + add $4 + sub [hl] + jr z, .checkXCoord + jr c, .pikaAbovePlayer + call CheckAbsoluteValueLessThan2 + jr c, .return1 + ld a, $5 + and a + ret + +.return1 + ld a, $1 + and a + ret + +.pikaAbovePlayer + call CheckAbsoluteValueLessThan2 + jr c, .return2 + ld a, $6 + and a + ret + +.return2 + ld a, $2 + and a + ret + +.checkXCoord + ld hl, wPlayerMapX - wPlayerSpriteStateData1 + add hl, bc + ld a, [wXCoord] + add $4 + sub [hl] + jr z, .pikachuOnTopOfPlayer + jr c, .pikaToLeftOfPlayer + call CheckAbsoluteValueLessThan2 + jr c, .return4 + ld a, $8 + and a + ret + +.return4 + ld a, $4 + and a + ret + +.pikaToLeftOfPlayer + call CheckAbsoluteValueLessThan2 + jr c, .return3 + ld a, $7 + and a + ret + +.return3 + ld a, $3 + and a + ret + +.pikachuOnTopOfPlayer + scf + ret + +CheckAbsoluteValueLessThan2: + jr nc, .positive + cpl + inc a +.positive + cp $2 + ret + +Func_fcc08:: + call Func_fcc23 + ret nc + ld a, [wd736] + bit 6, a + jr nz, .asm_fcc1b + call Func_fcc42 + ret c + call AppendPikachuFollowCommandToBuffer + ret + +.asm_fcc1b + call Func_fcc64 + ret c + call AppendPikachuFollowCommandToBuffer + ret + +Func_fcc23: + ld a, [wPikachuOverworldStateFlags] + bit 5, a + jr nz, .asm_fcc40 + ld a, [wPikachuOverworldStateFlags] + bit 7, a + jr nz, .asm_fcc40 + ld a, [wd472] + bit 7, a + jr z, .asm_fcc40 + ld a, [wWalkBikeSurfState] + and a + jr nz, .asm_fcc40 + scf + ret + +.asm_fcc40 + and a + ret + +Func_fcc42: + xor a + ld a, [wPlayerDirection] + bit 3, a + jr nz, .asm_fcc58 + bit 2, a + jr nz, .asm_fcc5b + bit 1, a + jr nz, .asm_fcc5e + bit 0, a + jr nz, .asm_fcc61 + scf + ret + +.asm_fcc58 + ld a, $2 + ret + +.asm_fcc5b + ld a, $1 + ret + +.asm_fcc5e + ld a, $3 + ret + +.asm_fcc61 + ld a, $4 + ret + +Func_fcc64: + ld hl, wPikachuOverworldStateFlags + bit 6, [hl] + jr z, .asm_fcc6e + res 6, [hl] + ret + +.asm_fcc6e + set 6, [hl] + xor a + ld a, [wPlayerDirection] + bit 3, a + jr nz, .asm_fcc86 + bit 2, a + jr nz, .asm_fcc89 + bit 1, a + jr nz, .asm_fcc8c + bit 0, a + jr nz, .asm_fcc8f + scf + ret + +.asm_fcc86 + ld a, $6 + ret + +.asm_fcc89 + ld a, $5 + ret + +.asm_fcc8c + ld a, $7 + ret + +.asm_fcc8f + ld a, $8 + ret + +Func_fcc92: + ld hl, wPikachuFollowCommandBufferSize + ld a, [hl] + cp $ff + jr z, .asm_fccb0 + and a + jr z, .asm_fccb0 + dec [hl] + ld e, a + ld d, 0 + ld hl, wPikachuFollowCommandBuffer + add hl, de + inc e + ld a, $ff +.asm_fcca8 + ld d, [hl] + ldd [hl], a + ld a, d + dec e + jr nz, .asm_fcca8 + and a + ret + +.asm_fccb0 + scf + ret + +ComputePikachuFacingDirection:: + call GetPikachuFollowCommandIfBufferSizeNonzero + and a + jr z, .check_y + dec a + and $3 + add a + add a + jr .load + +.check_y + ld a, [wYCoord] + add $4 + ld d, a + ld a, [wXCoord] + add $4 + ld e, a + ld a, [wPikachuMapY] + cp d + jr z, .check_x + ld a, SPRITE_FACING_DOWN + jr c, .load + ld a, SPRITE_FACING_UP + jr .load + +.check_x + ld a, [wPikachuMapX] + cp e + jr z, .copy_from_player + ld a, SPRITE_FACING_RIGHT + jr c, .load + ld a, SPRITE_FACING_LEFT + jr .load + +.copy_from_player + ld a, [wPlayerFacingDirection] +.load + ld [wPikachuFacingDirection], a + ret + +GetPikachuFollowCommand: + ld hl, wPikachuFollowCommandBufferSize + ld a, [hl] + cp $ff + jr z, .asm_fccff + ld e, a + ld d, 0 + ld hl, wPikachuFollowCommandBuffer + add hl, de + ld a, [hl] + ret + +.asm_fccff + xor a + ret + +GetPikachuFollowCommandIfBufferSizeNonzero: + ld hl, wPikachuFollowCommandBufferSize + ld a, [hl] + cp $ff + jr z, .default + and a + jr z, .default + ld e, a + ld d, 0 + ld hl, wPikachuFollowCommandBuffer + add hl, de + ld a, [hl] + ret + +.default + xor a + ret + +AreThereAtLeastTwoStepsInPikachuFollowCommandBuffer: + ld a, [wPikachuFollowCommandBufferSize] + cp $ff + ret z + cp $2 + jr nc, .set_carry + and a + ret + +.set_carry + scf + ret + +WillPikachuSpawnOnTheScreen: + ld h, wSpriteStateData2 / $100 + ld a, [H_CURRENTSPRITEOFFSET] ; If we're here, this can only be $f0 + add wPikachuMapY - wPikachuSpriteStateData2 + ld l, a + ld b, [hl] + ld a, [wYCoord] + cp b + jr z, .same_y + jr nc, .not_on_screen + add (SCREEN_HEIGHT / 2) - 1 + cp b + jr c, .not_on_screen +.same_y + inc l + ld b, [hl] + ld a, [wXCoord] + cp b + jr z, .same_x + jr nc, .not_on_screen + add (SCREEN_WIDTH / 2) - 1 + cp b + jr c, .not_on_screen +.same_x + call .GetNPCCurrentTile + ld d, $60 + ld a, [hli] + ld e, a + cp d + jr nc, .not_on_screen + ld a, [hld] + cp d + jr nc, .not_on_screen + ld bc, -20 + add hl, bc + ld a, [hli] + cp d + jr nc, .not_on_screen + ld a, [hl] + cp d + jr c, .on_screen +.not_on_screen + ld h, wSpriteStateData1 / $100 + ld a, [H_CURRENTSPRITEOFFSET] + add wPikachuSpriteImageIdx - wPikachuSpriteStateData1 + ld l, a + ld [hl], $ff + scf + jr .return + +.on_screen + ld h, wSpriteStateData2 / $100 + ld a, [H_CURRENTSPRITEOFFSET] + add wPikachuGrassPriority - wPikachuSpriteStateData2 + ld l, a + ld a, [wGrassTile] + cp e + ld a, $0 + jr nz, .priority + ld a, $80 +.priority + ld [hl], a + and a +.return + ret + +.GetNPCCurrentTile: + ld h, wSpriteStateData1 / $100 + ld a, [H_CURRENTSPRITEOFFSET] + add wPikachuYPixels - wPikachuSpriteStateData1 + ld l, a + ld a, [hli] + add $4 + and $f0 + srl a + ld c, a + ld b, $0 + inc l + ld a, [hl] + add $2 + srl a + srl a + srl a + add SCREEN_WIDTH + ld d, 0 + ld e, a + ld hl, wTileMap + rept 5 + add hl, bc + endr + add hl, de + ret + +ComparePikachuHappinessTo80: +; preserves a and bc + push bc + push af + ld a, [wPikachuHappiness] + cp 80 + pop bc + ld a, b + pop bc + ret |