Split up engine/events/hidden_object_functions

engine/events/hidden_objects/bookshelves.asm

@@ -0,0 +1,39 @@
+; prints text for bookshelves in buildings without sign events
+PrintBookshelfText::
+	ld a, [wSpriteStateData1 + 9] ; player's sprite facing direction
+	cp SPRITE_FACING_UP
+	jr nz, .noMatch
+; facing up
+	ld a, [wCurMapTileset]
+	ld b, a
+	aCoord 8, 7
+	ld c, a
+	ld hl, BookshelfTileIDs
+.loop
+	ld a, [hli]
+	cp $ff
+	jr z, .noMatch
+	cp b
+	jr nz, .nextBookshelfEntry1
+	ld a, [hli]
+	cp c
+	jr nz, .nextBookshelfEntry2
+	ld a, [hl]
+	push af
+	call EnableAutoTextBoxDrawing
+	pop af
+	call PrintPredefTextID
+	xor a
+	ld [$ffdb], a
+	ret
+.nextBookshelfEntry1
+	inc hl
+.nextBookshelfEntry2
+	inc hl
+	jr .loop
+.noMatch
+	ld a, $ff
+	ld [$ffdb], a
+	jpba PrintCardKeyText
+
+INCLUDE "data/tilesets/bookshelf_tile_ids.asm"