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; reads struct:
; x (1 byte), y (1 byte), data (n bytes), $00
; writes data to BGMap0-translated x,y
; important: make sure VRAM can be accessed first, else use WriteDataBlockToBGMap0
UnsafeWriteDataBlockToBGMap0:
ld a, [hli]
ld b, a
ld a, [hli]
ld c, a
call BCCoordToBGMap0Address
jr .next
.loop
ld [de], a
inc de
.next
ld a, [hli]
or a
jr nz, .loop
ret
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