SECTION "functions", ROM0[$2000]
; Wait for vblank without using interrupts.
waitVBlank:
	push af
.waitVBlankLoop:
	ldh a, [$ff44]
	cp $90
	jr nz, .waitVBlankLoop
	pop af
	ret

; Writes a value across 16 bytes, starting at HL. Intended to fill a single tile.
; Parameters:
;     B - The value to set the bytes to.
; Modifies:
;     HL - End result: HL + 16
fillTile:
	push af
	push de
	ld d, 16
	ld a, b
.fillTileLoop:
	ld [hli], a
	dec d
	jr nz, .fillTileLoop
	pop de
	pop af
	ret