-/* drawbox.c */
-int drawbox(double xmin, double ymin, double xmax, double ymax);
-/* gp.c */
-int gptrace(int state);
-int viewprt3(double xmin, double ymin, double zmin, double xmax, double ymax, double zmax);
-int window3(double xmin, double ymin, double xmax, double ymax);
-int setproj(int pr, double x, double y, double z);
-int setvrp(double x, double y, double z);
-int setvpn(double x, double y, double z);
-int setvup(double x, double y, double z);
-int viewdepth(double front, double back);
-int gpfrontclip(int on_off);
-int gpbackclip(int on_off);
-int calcnper(void);
-int calcnpar(void);
-int calcrot(double rot[5][5]);
-int calcpertrans(void);
-int calcpartrans(void);
-int matident(double mtx[5][5]);
-int matmult(double premtx[5][5], double postmtx[5][5], double result[5][5]);
-int crossprod(struct point *v, struct point *w, struct point *result);
-int transform(double mtx[5][5], double *x, double *y, double *z);
-int homotrans(double mtx[5][5], double *x, double *y, double *z, double *w);
-int moveabs3(double x, double y, double z);
-int moverel3(double xr, double yr, double zr);
-int lineabs3(double x, double y, double z);
-int linerel3(double xr, double yr, double zr);
-int drawline(double xinput, double yinput, double zinput);
-int mastertondc(double *x, double *y, double *z);
-int checkchange(void);
-int initgrf3(void);
-int termgrf3(void);
-int matwrite(double mtx[5][5]);
-int pyr_edge(double x, double y, double z, int *pos);
-int clippyramid(double *x1, double *y1, double *z1, double *x2, double *y2, double *z2, int *accept);
-int cube_edge(double x, double y, double z, int *pos);
-int clipcube(double *x1, double *y1, double *z1, double *x2, double *y2, double *z2, int *accept);
-/* pickbox.c */
-int pickbox(int dev, int *xmin, int *ymin, int *xmax, int *ymax, int xtab[], int ytab[]);
-/* pickloc.c */
-int pickloc(int dev, int *xloc, int *yloc, int xtab[], int ytab[]);
-/* pixblock.c */
-int readblock(char array[], int x1, int y1, int x2, int y2);
-int writeblock(char array[], int x1, int y1, int mode);
-char *allocblock(int x1, int y1, int x2, int y2);
-/* readloc.c */
-int readloc(int dev, int *x, int *y);
-int loc_to_ndc(int xloc, int yloc, float *xndc, float *yndc);
-int readbutt(int dev);
-/* sgp.c */
-int gp_init_2(void);
-int window2(double xmin, double ymin, double xmax, double ymax);
-int window_2(double xmin, double ymin, double xmax, double ymax);
-int viewprt2(double xmin, double ymin, double xmax, double ymax);
-int viewport_2(double xmin, double ymin, double xmax, double ymax);
-int framevpt(void);
-int calc_wc_to_ndc(void);
-int calc_ndc_to_mc(void);
-int wc_to_ndc(double xw, double yw, double *xn, double *yn);
-int ndc_to_wc(double xn, double yn, double *xw, double *yw);
-int color(int icol);
-int linestyle(int style);
-int line_abs_2(double x, double y);
-int lineabs2(double x, double y);
-int move_abs_2(double x, double y);
-int moveabs2(double x, double y);
-int line_rel_2(double x, double y);
-int linerel2(double x, double y);
-int move_rel_2(double x, double y);
-int moverel2(double x, double y);
-int draw_text(char *message);
-int drawtext(char *message);
-int polylnabs2(double x[], double y[], int n);
-int markabs2(double x, double y);
-int markrel2(double x, double y);
-int pntabs2(double x, double y);
-int pntrel2(double x, double y);
-int ctm_clr_2(void);
-int ctm_get_2(GRFMTX_2D m);
-int ctm_set_2(GRFMTX_2D m);
-int ctm_pre_mult_2(GRFMTX_2D m);
-int ctm_post_mult_2(GRFMTX_2D m);
-/* sgpdrive.c */
-int initgrf2(void);
+
+/* drawbox.cpp */
+void sgp2_draw_rect (double xmin, double ymin, double xmax, double ymax);
+
+/* sgp.cpp */
+SGP_ID sgp2_init (int xsize, int ysize, const char *title);
+void sgp2_close (SGP_ID gid);
+void sgp2_set_active_win (SGP_ID);
+SGP_ID sgp2_get_active_win (void);
+void sgp2_clear (void);
+void sgp2_window(double xmin, double ymin, double xmax, double ymax);
+void sgp2_viewport(double xmin, double ymin, double xmax, double ymax);
+void sgp2_frame_vpt(void);
+void calc_wc_to_ndc(void);
+void calc_ndc_to_mc(void);
+void wc_to_ndc(double xw, double yw, double *xn, double *yn);
+void ndc_to_wc(double xn, double yn, double *xw, double *yw);
+void sgp2_color(int icol);
+void sgp2_line_style(int style);
+void sgp2_line_abs(double x, double y);
+void sgp2_move_abs(double x, double y);
+void sgp2_line_rel(double x, double y);
+void sgp2_move_rel(double x, double y);
+void sgp2_draw_text(char *message);
+void sgp2_polyline_abs(double x[], double y[], int n);
+void sgp2_mark_abs(double x, double y);
+void sgp2_mark_rel(double x, double y);
+void sgp2_point_abs(double x, double y);
+void sgp2_point_rel(double x, double y);
+void charsize(double wid, double height);
+void textangle(double angle);
+void ctm_clr_2(void);
+void ctm_get_2(GRFMTX_2D m);
+void ctm_set_2(GRFMTX_2D m);
+void ctm_pre_mult_2(GRFMTX_2D m);
+void ctm_post_mult_2(GRFMTX_2D m);
+
+/* sgpdrive.cpp */
+int _sgp2_init_dev(SGP_ID gid);