public static vec2 KeyboardDir(Keys Left = Keys.Left, Keys Right = Keys.Right, Keys Up = Keys.Up, Keys Down = Keys.Down)
{
vec2 dir = vec2.Zero;
if (Up.Down()) dir.y = 1;
if (Down.Down()) dir.y = -1;
if (Right.Down()) dir.x = 1;
if (Left.Down()) dir.x = -1;
return dir;
}