First Commit

Upload literally everything from the pokecrystal16 expand-move-ID branch

engine/overworld/map_objects_2.asm

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+LoadObjectMasks:
+	ld hl, wObjectMasks
+	xor a
+	ld bc, NUM_OBJECTS
+	call ByteFill
+	nop
+	ld bc, wMapObjects
+	ld de, wObjectMasks
+	xor a
+.loop
+	push af
+	push bc
+	push de
+	call GetObjectTimeMask
+	jr c, .next
+	call CheckObjectFlag
+.next
+	pop de
+	ld [de], a
+	inc de
+	pop bc
+	ld hl, MAPOBJECT_LENGTH
+	add hl, bc
+	ld b, h
+	ld c, l
+	pop af
+	inc a
+	cp NUM_OBJECTS
+	jr nz, .loop
+	ret
+
+CheckObjectFlag:
+	ld hl, MAPOBJECT_SPRITE
+	add hl, bc
+	ld a, [hl]
+	and a
+	jr z, .masked
+	ld hl, MAPOBJECT_EVENT_FLAG
+	add hl, bc
+	ld a, [hli]
+	ld e, a
+	ld a, [hl]
+	ld d, a
+	cp -1
+	jr nz, .check
+	ld a, e
+	cp -1
+	jr z, .unmasked
+	jr .masked
+.check
+	ld b, CHECK_FLAG
+	call EventFlagAction
+	ld a, c
+	and a
+	jr nz, .masked
+.unmasked
+	xor a
+	ret
+
+.masked
+	ld a, -1
+	scf
+	ret
+
+GetObjectTimeMask:
+	call CheckObjectTime
+	ld a, -1
+	ret c
+	xor a
+	ret