add framebuffer

local fb = {}

fb.w = 0

fb.h = 0

fb.x = 0

fb.y = 0

fb.buf = nil

function fb.init(w, h)

	fb.w = w

	fb.h = h

	fb.x = 0

	fb.y = 0

	fb.buf = {}

end

function fb.scroll()

	for x = 0, fb.w-1 do

		for y = 1, fb.h/8-1 do

			fb.buf[x*(fb.h/8) + y-1 + 1] = fb.buf[x*(fb.h/8) + y + 1] or nil

		end

		fb.buf[x*(fb.h/8) + fb.h/8] = nil

	end

	fb.y = fb.y - 8

end

function fb.put(font, c)

	if c == 10 then

		fb.x = 0

		fb.y = fb.y + font.height

		return

	end

	if c < 32 or c > 126 then

		c = 0x3f

	end

	if fb.y >= fb.h then

		fb.scroll()

	end

	local glyph = font.glyphs[c - 31]

	for i = 1, table.getn(glyph) do

		fb.buf[fb.y/8 + (fb.x + i-1) * (fb.h/8) + 1] = glyph[i]

	end

	fb.x = fb.x + table.getn(glyph) + 2

	if fb.x > fb.w then

		fb.put(font, 10)

	end

end

function fb.print(font, str)

	for i = 1, string.len(str) do

		fb.put(font, string.byte(str, i))

	end

end

return fb