int ggi2dInit(void);
Initializes the libGGI2D library. This MUST be called at startup.
void ggi2dExit(void);
Deinitializes the libGGI2D library. This MUST be called before exit.
void ggi2dOpen(ggi_visual_t vis);
Initialize a visual. This MUST be done before any drawing. The default values of a visual are:
void ggi2dClose(ggi_visual_t vis);
End drawing on the visual.
void ggi2dReset(ggi_visual vis);
Reset the visual to the default values (as listed above).