+* GLUT API Extension macro definitions -- Spaceball button definitions
+*/
+
+#define GLUT_SPACEBALL_BUTTON_A 0x0001
+#define GLUT_SPACEBALL_BUTTON_B 0x0002
+#define GLUT_SPACEBALL_BUTTON_C 0x0004
+#define GLUT_SPACEBALL_BUTTON_D 0x0008
+#define GLUT_SPACEBALL_BUTTON_E 0x0010
+
+/*
+ * Process loop function, see fg_main.c