OG_VAL
OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = rows;
OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = cols;
#define OG_ISSET(gp, o) OG_VAL((gp), (o))