@includeonce "io.prn"

7 "b_nblocks" store

15 "b_block1" store #I
23 "b_block2" store #L
71 "b_block3" store #J
51 "b_block4" store #O
54 "b_block5" store #S
99 "b_block6" store #Z
114 "b_block7" store #T

@defun "b_getblock" { #arg: block idx [1..7]
	"b_block" swap + get
}

@defun "b_drawblock" { #args: x y blockidx
	b_getblock
	"blockbits" store
	"y" store
	"x" store

	blockbits 16 % "row1" store
	blockbits 16 / "row2" store

	x "xx" store
	row1 while
		row1 2 % if
			xx y io_gsquare
		end
		xx 1 + "xx" store
		row1 2 / "row1" store
	row1 end

	y 1 + "y" store

	x "xx" store
	row2 while
		row2 2 % if
			xx y io_gsquare
		end
		xx 1 + "xx" store
		row2 2 / "row2" store
	row2 end
}