1 files changed, 394 insertions, 0 deletions
diff --git a/engine/animated_objects_3e.asm b/engine/animated_objects_3e.asm
new file mode 100755
index 00000000..2373e19e
--- /dev/null
+++ b/engine/animated_objects_3e.asm
@@ -0,0 +1,394 @@
+ClearObjectAnimationBuffers:
+	ld hl, wAnimatedObjectsData
+	ld bc, wAnimatedObjectsDataEnd - wAnimatedObjectsData
+	xor a
+	call FillMemory
+	ret
+
+RunObjectAnimations:
+	ld hl, wAnimatedObjectDataStructs
+	ld e, 10
+.loop
+	ld a, [hl]
+	and a
+	jr z, .next
+	ld c, l
+	ld b, h
+	push hl
+	push de
+	call ExecuteCurrentAnimatedObjectCallback
+	call UpdateCurrentAnimatedObjectFrame
+	pop de
+	pop hl
+	jr c, .quit
+.next
+	ld bc, $10
+	add hl, bc
+	dec e
+	jr nz, .loop
+	ld a, [wCurrentAnimatedObjectOAMBufferOffset]
+	ld l, a
+	ld h, wOAMBuffer / $100
+.deinit_unused_oam_loop
+	ld a, l
+	cp wOAMBufferEnd % $100
+	jr nc, .quit
+	xor a
+	ld [hli], a
+	jr .deinit_unused_oam_loop
+
+.quit
+	ret
+
+SpawnAnimatedObject:
+	push de
+	push af
+	ld hl, wAnimatedObjectDataStructs
+	ld e, 10
+.loop
+	ld a, [hl]
+	and a
+	jr z, .init
+	ld bc, $10
+	add hl, bc
+	dec e
+	jr nz, .loop
+	pop af
+	pop de
+	scf
+	ret
+
+.init
+	pop af
+	ld c, l
+	ld b, h
+	ld hl, wNumLoadedAnimatedObjects
+	inc [hl]
+	ld e, a
+	ld d, $0
+	ld a, [wAnimatedObjectSpawnStateDataPointer]
+	ld l, a
+	ld a, [wAnimatedObjectSpawnStateDataPointer + 1]
+	ld h, a
+	add hl, de
+	add hl, de
+	add hl, de
+	ld e, l
+	ld d, h
+	ld hl, $0
+	add hl, bc
+	ld a, [wNumLoadedAnimatedObjects]
+	ld [hli], a
+	ld a, [de]
+	ld [hli], a
+	inc de
+	ld a, [de]
+	ld [hli], a
+	inc de
+	xor a
+	ld [hli], a
+	pop de
+	ld hl, $4
+	add hl, bc
+	ld a, e
+	ld [hli], a
+	ld a, d
+	ld [hli], a
+	xor a
+	ld [hli], a
+	ld [hli], a
+	xor a
+	ld [hli], a
+	ld [hli], a
+	dec a
+	ld [hli], a
+	xor a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hli], a
+	ld [hl], a
+	ret
+
+MaskCurrentAnimatedObjectStruct:
+	ld hl, $0
+	add hl, bc
+	ld [hl], $0
+	ret
+
+MaskAllAnimatedObjectStructs:
+	ld hl, wAnimatedObjectDataStructs
+	ld e, 10
+.loop
+	ld [hl], $0
+	ld bc, $10
+	add hl, bc
+	dec e
+	jr nz, .loop
+	ret
+
+UpdateCurrentAnimatedObjectFrame:
+	xor a
+	ld [wCurAnimatedObjectOAMAttributes], a
+	ld hl, $3
+	add hl, bc
+	ld a, [hli]
+	ld [wCurrentAnimatedObjectVTileOffset], a
+	ld a, [hli]
+	ld [wCurrentAnimatedObjectXCoord], a
+	ld a, [hli]
+	ld [wCurrentAnimatedObjectYCoord], a
+	ld a, [hli]
+	ld [wCurrentAnimatedObjectXOffset], a
+	ld a, [hl]
+	ld [wCurrentAnimatedObjectYOffset], a
+	call UpdateDurationTimerAndFrameStateForCurrentAnimatedObject
+	cp $fd
+	jr z, .finish
+	cp $fc
+	jr z, .delete_animation
+	call GetCurrentAnimatedObjectOAMDataPointer
+	ld a, [wCurrentAnimatedObjectVTileOffset]
+	add [hl]
+	ld [wCurrentAnimatedObjectVTileOffset], a
+	inc hl
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	push bc
+	ld a, [wCurrentAnimatedObjectOAMBufferOffset]
+	ld e, a
+	ld d, wOAMBuffer / $100
+	ld a, [hli]
+	ld c, a
+.loop
+	ld a, [wCurrentAnimatedObjectYCoord]
+	ld b, a
+	ld a, [wCurrentAnimatedObjectYOffset]
+	add b
+	ld b, a
+	ld a, [wAnimatedObjectGlobalYOffset]
+	add b
+	ld b, a
+	call GetCurrentAnimatedObjectTileYCoordinate
+	add b
+	ld [de], a
+	inc hl
+	inc de
+	ld a, [wCurrentAnimatedObjectXCoord]
+	ld b, a
+	ld a, [wCurrentAnimatedObjectXOffset]
+	add b
+	ld b, a
+	ld a, [wAnimatedObjectGlobalXOffset]
+	add b
+	ld b, a
+	call GetCurrentAnimatedObjectTileXCoordinate
+	add b
+	ld [de], a
+	inc hl
+	inc de
+	ld a, [wCurrentAnimatedObjectVTileOffset]
+	add [hl]
+	ld [de], a
+	inc hl
+	inc de
+	call SetCurrentAnimatedObjectOAMAttributes
+	ld b, a
+	ld a, [wc634]
+	cp $7
+	ld a, b
+	jr z, .skip_load
+	ld [de], a
+.skip_load
+	inc hl
+	inc de
+	ld a, e
+	ld [wCurrentAnimatedObjectOAMBufferOffset], a
+	cp wOAMBufferEnd % $100
+	jr nc, .oam_is_full
+	dec c
+	jr nz, .loop
+	pop bc
+	jr .finish
+
+.delete_animation
+	call MaskCurrentAnimatedObjectStruct
+.finish
+	and a
+	ret
+
+.oam_is_full
+	pop bc
+	scf
+	ret
+
+GetCurrentAnimatedObjectTileYCoordinate:
+	push hl
+	ld a, [hl]
+	ld hl, wCurAnimatedObjectOAMAttributes
+	bit 6, [hl]
+	jr z, .no_flip
+	add $8
+	xor $ff
+	inc a
+.no_flip
+	pop hl
+	ret
+
+GetCurrentAnimatedObjectTileXCoordinate:
+	push hl
+	ld a, [hl]
+	ld hl, wCurAnimatedObjectOAMAttributes
+	bit 5, [hl]
+	jr z, .no_flip
+	add $8
+	xor $ff
+	inc a
+.no_flip
+	pop hl
+	ret
+
+SetCurrentAnimatedObjectOAMAttributes:
+	ld a, [wCurAnimatedObjectOAMAttributes]
+	ld b, a
+	ld a, [hl]
+	xor b
+	and $e0
+	ld b, a
+	ld a, [hl]
+	and $10
+	or b
+	bit 4, a
+	ret z
+	or $4
+	ret
+
+GetCurrentAnimatedObjectOAMDataPointer:
+	ld e, a
+	ld d, $0
+	ld a, [wAnimatedObjectOAMDataPointer]
+	ld l, a
+	ld a, [wAnimatedObjectOAMDataPointer + 1]
+	ld h, a
+	add hl, de
+	add hl, de
+	add hl, de
+	ret
+
+SetCurrentAnimatedObjectCallbackAndResetFrameStateRegisters:
+	ld hl, $1
+	add hl, bc
+	ld [hl], a
+	ld hl, $8
+	add hl, bc
+	ld [hl], $0
+	ld hl, $9
+	add hl, bc
+	ld [hl], $0
+	ld hl, $a
+	add hl, bc
+	ld [hl], $ff
+	ret
+
+UpdateDurationTimerAndFrameStateForCurrentAnimatedObject:
+.loop
+	ld hl, $8
+	add hl, bc
+	ld a, [hl]
+	and a
+	jr z, .next_frame
+	dec [hl]
+	call GetPointerToCurrentAnimatedObjectFrameScript
+	ld a, [hli]
+	push af
+	jr .finish
+
+.next_frame
+	ld hl, $a
+	add hl, bc
+	inc [hl]
+	call GetPointerToCurrentAnimatedObjectFrameScript
+	ld a, [hli]
+	cp $fe
+	jr z, .restart_anim
+	cp $ff
+	jr z, .hold_last_frame_state
+	push af
+	ld a, [hl]
+	push hl
+	and $3f
+	ld hl, $9
+	add hl, bc
+	add [hl]
+	ld hl, $8
+	add hl, bc
+	ld [hl], a
+	pop hl
+.finish
+	ld a, [hl]
+	and $c0
+	srl a
+	ld [wCurAnimatedObjectOAMAttributes], a
+	pop af
+	ret
+
+.hold_last_frame_state
+	xor a
+	ld hl, $8
+	add hl, bc
+	ld [hl], a
+	ld hl, $a
+	add hl, bc
+	dec [hl]
+	dec [hl]
+	jr .loop
+
+.restart_anim
+	xor a
+	ld hl, $8
+	add hl, bc
+	ld [hl], a
+	dec a
+	ld hl, $a
+	add hl, bc
+	ld [hl], a
+	jr .loop
+
+GetPointerToCurrentAnimatedObjectFrameScript:
+	ld hl, $1
+	add hl, bc
+	ld e, [hl]
+	ld d, $0
+	ld a, [wAnimatedObjectFramesDataPointer]
+	ld l, a
+	ld a, [wAnimatedObjectFramesDataPointer + 1]
+	ld h, a
+	add hl, de
+	add hl, de
+	ld e, [hl]
+	inc hl
+	ld d, [hl]
+	ld hl, $a
+	add hl, bc
+	ld l, [hl]
+	ld h, $0
+	add hl, hl
+	add hl, de
+	ret
+
+ExecuteCurrentAnimatedObjectCallback:
+	ld hl, $2
+	add hl, bc
+	ld e, [hl]
+	ld d, $0
+	ld a, [wAnimatedObjectJumptablePointer]
+	ld l, a
+	ld a, [wAnimatedObjectJumptablePointer + 1]
+	ld h, a
+	add hl, de
+	add hl, de
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	jp hl