int gl_printf(int x, int y, const char *fmt, ...);
a formatted string to position
using the currently selected font. If one or both of
x and y
is negative, the text printing continues at the last position. The
\t and \v
have the usual effects.
Printing wraps at the screen borders. Nevertheless, behaviour is undefined
if not a single characters fits on the screen or if the initial position
is outside the screen.