GRCG_SETCOLOR_DIRECT_DEF macro
	public @grcg_setcolor_direct_raw$qv
	@grcg_setcolor_direct_raw$qv proc near
		cli
		mov	dx, 7Eh
		rept 4
			shr	ah, 1
			sbb	al, al
			out	dx, al
		endm
		sti
		ret
	@grcg_setcolor_direct_raw$qv endp
endm

; Convenience macro to prepare ES:DI.
GRCG_FILL_PLAYFIELD_ROWS	macro y:req, num_rows:req, scratch_seg:=<ax>
	mov	scratch_seg, GRAM_400 + (((y + PLAYFIELD_TOP) * ROW_SIZE) shr 4)
	mov	es, scratch_seg
	mov	di, ((num_rows - 1) * ROW_SIZE) + PLAYFIELD_VRAM_LEFT
	call	_grcg_fill_playfield_rows
endm