float win_aspect;
unsigned int time_msec;
+float sball_obj_matrix[16], sball_cam_matrix[16];
+
int demo_init(int argc, char **argv);
void demo_cleanup(void);
void demo_mbutton(int bn, int pressed, int x, int y);
void demo_mmotion(int x, int y);
+void demo_sball_motion(int x, int y, int z);
+void demo_sball_rotate(int x, int y, int z);
+void demo_sball_button(int bn, int pressed);
+
/* defined in main.c */
void demo_quit(void);
unsigned int get_msec(void);