typedef enum {
 GLF_ERROR           =-1,
 GLF_OK              = 0,
 GLF_YES             = 1,
 GLF_NO              = 2,

 GLF_CONSOLE_MESSAGES =10,
 GLF_TEXTURING        =11,
 GLF_CONTOURING       =12,

 GLF_LEFT_UP          =20,
 GLF_LEFT_CENTER      =21,
 GLF_LEFT_DOWN        =22,
 GLF_CENTER_UP        =23,
 GLF_CENTER_CENTER    =24,
 GLF_CENTER_DOWN      =25,
 GLF_RIGHT_UP         =26,
 GLF_RIGHT_CENTER     =27,
 GLF_RIGHT_DOWN       =28,
 GLF_CENTER           =24,

 GLF_LEFT	=1,
 GLF_RIGHT	=2,
 GLF_UP		=3,
 GLF_DOWN	=4,

/* Console constants */
 GLF_CONSOLE_CURSOR   =30
};