validateCoords: MACRO
	IF \1 >= SCREEN_WIDTH
		fail "x coord out of range"
	ENDC
	IF \2 >= SCREEN_HEIGHT
		fail "y coord out of range"
	ENDC
ENDM

;\1 = r
;\2 = X
;\3 = Y
;\4 = which tilemap (optional)
coord: MACRO
	validateCoords \2, \3
	IF _NARG >= 4
		ld \1, \4 + SCREEN_WIDTH * \3 + \2
	ELSE
		ld \1, wTileMap + SCREEN_WIDTH * \3 + \2
	ENDC
ENDM

;\1 = X
;\2 = Y
;\3 = which tilemap (optional)
aCoord: MACRO
	validateCoords \1, \2
	IF _NARG >= 3
		ld a, [\3 + SCREEN_WIDTH * \2 + \1]
	ELSE
		ld a, [wTileMap + SCREEN_WIDTH * \2 + \1]
	ENDC
ENDM

;\1 = X
;\2 = Y
;\3 = which tilemap (optional)
Coorda: MACRO
	validateCoords \1, \2
	IF _NARG >= 3
		ld [\3 + SCREEN_WIDTH * \2 + \1], a
	ELSE
		ld [wTileMap + SCREEN_WIDTH * \2 + \1], a
	ENDC
ENDM

;\1 = X
;\2 = Y
;\3 = which tilemap (optional)
dwCoord: MACRO
	validateCoords \1, \2
	IF _NARG >= 3
		dw \3 + SCREEN_WIDTH * \2 + \1
	ELSE
		dw wTileMap + SCREEN_WIDTH * \2 + \1
	ENDC
ENDM

;\1 = r
;\2 = X
;\3 = Y
;\4 = map width
overworldMapCoord: MACRO
	ld \1, wOverworldMap + ((\2) + 3) + (((\3) + 3) * ((\4) + (3 * 2)))
ENDM