WIDTH = 3;
HEIGHT = 3;
SIDE = "back";

Data = {};

-- -----------------------------------------------------------------------------------------------
function Initialize()
    for i = 1, (HEIGHT * WIDTH) do
        Data[i] = false;
    end

    Randomize();
end

-- -----------------------------------------------------------------------------------------------
function Randomize()
    for i = 1, #Data do
        Data[i] = math.random(2) == 1;
    end
end

-- -----------------------------------------------------------------------------------------------
function GetIndex(x, y)
    if (x > WIDTH) then
        print(string.format("ERROR - GetIndex, X out of range: %d of %d", x, WIDTH));
        return nil;
    end

    if (y > HEIGHT) then
        print(string.format("ERROR - GetIndex, Y out of range: %d of %d", y, HEIGHT));
        return nil;
    end

    return ((y - 1) * WIDTH) + x;
end

-- -----------------------------------------------------------------------------------------------
function GetCoords(index)
    local x = math.floor(index / WIDTH) + 1;
    local y = index % WIDTH;

    return x, y;
end

-- -----------------------------------------------------------------------------------------------
function IndexToBitFlag(index)
    return bit.blshift(1, index - 1)
end



-- -----------------------------------------------------------------------------------------------
function Render()
    local output = 0;

    for i = 1, #Data do
        local value = Data[i];
        local flag = IndexToBitFlag(i);

        if (value) then
            output = bit.bor(output, bit);
        else
            output = bit.band(output, bit.bnot(flag));
        end
    end

    rs.setBundledOutput(SIDE, output);
end


-- -----------------------------------------------------------------------------------------------
Initialize();
-- -----------------------------------------------------------------------------------------------

while true do
    Randomize();
    Render();
    os.sleep(1);
end