X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=progs%2Fdemos%2FCallbackMaker%2FCallbackMaker.c;h=c8f65e66a82a957d307f38f52cc0797abe6ec606;hb=74381be60e5b99924e291ab13e1cbdca113a2756;hp=e952c25696fb6f61cc6ac284e1d3b0849647a298;hpb=1e778f9ed7ff8009e4555ef4043509b0c9f01ebd;p=freeglut

diff --git a/progs/demos/CallbackMaker/CallbackMaker.c b/progs/demos/CallbackMaker/CallbackMaker.c
index e952c25..c8f65e6 100644
--- a/progs/demos/CallbackMaker/CallbackMaker.c
+++ b/progs/demos/CallbackMaker/CallbackMaker.c
@@ -11,24 +11,55 @@
 
 static int sequence_number = 0 ;
 
-int reshape_called = 0, key_called = 0, special_called = 0, visibility_called = 0,
-    keyup_called = 0, specialup_called = 0, joystick_called = 0, mouse_called = 0,
-    mousewheel_called = 0, motion_called = 0, passivemotion_called = 0, entry_called = 0,
-    close_called = 0, overlaydisplay_called = 0, windowstatus_called = 0,
-    spacemotion_called = 0, spacerotation_called = 0, spacebutton_called = 0,
-    buttonbox_called = 0, dials_called = 0, tabletmotion_called = 0, tabletbutton_called = 0,
-    menudestroy_called = 0, menustatus_called = 0 ;
-int reshape_width = -1, reshape_height = -1, reshape_seq = -1 ;
-int key_key = -1, key_x = -1, key_y = -1, key_seq = -1 ;
-int special_key = -1, special_x = -1, special_y = -1, special_seq = -1 ;
-int visibility_vis = -1, visibility_seq = -1 ;
-int keyup_key = -1, keyup_x = -1, keyup_y = -1, keyup_seq = -1 ;
-int specialup_key = -1, specialup_x = -1, specialup_y = -1, specialup_seq = -1 ;
-int joystick_a = -1, joystick_b = -1, joystick_c = -1, joystick_d = -1, joystick_seq = -1 ;  /* Need meaningful names */
-int mouse_button = -1, mouse_updown = -1, mouse_x = -1, mouse_y = -1, mouse_seq = -1 ;
-int mousewheel_number = -1, mousewheel_direction = -1, mousewheel_x = -1, mousewheel_y = -1, mousewheel_seq = -1 ;
-int motion_x = -1, motion_y = -1, motion_seq = -1 ;
-int passivemotion_x = -1, passivemotion_y = -1, passivemotion_seq = -1 ;
+int windows[2] = {0};
+
+/* define status vars showing whether given callback has been called for given window */
+#define CALLBACK_CALLED_VAR(name) int name##_called[2] = {0};
+#define CALLBACK_1_VAR(name,field) int name##_##field[2], name##_seq[2] = {-1};
+#define CALLBACK_2_VARS(name,field1,field2) int name##_##field1[2], name##_##field2[2], name##_seq[2] = {-1};
+#define CALLBACK_3_VARS(name,field1,field2,field3) int name##_##field1[2], name##_##field2[2], name##_##field3[2], name##_seq[2] = {-1};
+#define CALLBACK_4_VARS(name,field1,field2,field3,field4) int name##_##field1[2], name##_##field2[2], name##_##field3[2], name##_##field4[2], name##_seq[2] = {-1};
+CALLBACK_CALLED_VAR(reshape);
+CALLBACK_2_VARS(reshape,width,height);
+CALLBACK_CALLED_VAR(key);
+CALLBACK_3_VARS(key,key,x,y);
+CALLBACK_CALLED_VAR(keyup);
+CALLBACK_3_VARS(keyup,key,x,y);
+CALLBACK_CALLED_VAR(special);
+CALLBACK_3_VARS(special,key,x,y);
+CALLBACK_CALLED_VAR(specialup);
+CALLBACK_3_VARS(specialup,key,x,y);
+CALLBACK_CALLED_VAR(visibility);
+CALLBACK_1_VAR(visibility,vis);
+CALLBACK_CALLED_VAR(joystick);
+CALLBACK_4_VARS(joystick,a,b,c,d);
+CALLBACK_CALLED_VAR(mouse);
+CALLBACK_4_VARS(mouse,button,updown,x,y);
+CALLBACK_CALLED_VAR(mousewheel);
+CALLBACK_4_VARS(mousewheel,number,direction,x,y);
+CALLBACK_CALLED_VAR(motion);
+CALLBACK_2_VARS(motion,x,y);
+CALLBACK_CALLED_VAR(passivemotion);
+CALLBACK_2_VARS(passivemotion,x,y);
+CALLBACK_CALLED_VAR(entry);
+CALLBACK_CALLED_VAR(close);
+/*CALLBACK_CALLED_VAR(overlaydisplay);
+CALLBACK_CALLED_VAR(windowstatus);
+CALLBACK_CALLED_VAR(spacemotion);
+CALLBACK_CALLED_VAR(spacerotation);
+CALLBACK_CALLED_VAR(spacebutton);
+CALLBACK_CALLED_VAR(buttonbox);
+CALLBACK_CALLED_VAR(dials);
+CALLBACK_CALLED_VAR(tabletmotion);
+CALLBACK_CALLED_VAR(tabletbutton);
+CALLBACK_CALLED_VAR(menustatus);*/
+/* menudestroy is registered on each menu, not a window */
+int menudestroy_called = 0 ;
+/* menustatus and menustate are global callbacks, set for all menus at the same time */
+int menustatus_called = 0;
+int menustate_called = 0;
+
+#define STRING_LENGTH   10
 
 static void
 bitmapPrintf (const char *fmt, ...)
@@ -37,16 +68,31 @@ bitmapPrintf (const char *fmt, ...)
     va_list args;
 
     va_start(args, fmt);
+#if defined(WIN32) && !defined(__CYGWIN__)
+    (void) _vsnprintf (buf, sizeof(buf), fmt, args);
+#else
     (void) vsnprintf (buf, sizeof(buf), fmt, args);
+#endif
     va_end(args);
     glutBitmapString ( GLUT_BITMAP_HELVETICA_12, (unsigned char*)buf ) ;
 }
 
+static int
+getWindowAndIdx(int *winIdx)
+{
+    int window = glutGetWindow();
+
+    if (winIdx)
+        (*winIdx) = window==windows[0]?0:1;
+
+    return window;
+}
 
 static void 
 Display(void)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   glClear ( GL_COLOR_BUFFER_BIT );
 
   glDisable ( GL_DEPTH_TEST );
@@ -59,61 +105,61 @@ Display(void)
   glPushMatrix ();
   glLoadIdentity ();
   glColor3ub ( 0, 0, 0 );
-  glRasterPos2i ( 10, glutGet ( GLUT_WINDOW_HEIGHT ) - 10 );
+  glRasterPos2i ( 10, glutGet ( GLUT_WINDOW_HEIGHT ) - 20 );	/* 10pt margin above 10pt letters */
 
-  if ( reshape_called )
+  if ( reshape_called[winIdx] )
   {
-    bitmapPrintf ( "Reshape %d:  %d %d\n", reshape_seq, reshape_width, reshape_height );
+    bitmapPrintf ( "Reshape %d:  %d %d\n", reshape_seq[winIdx], reshape_width[winIdx], reshape_height[winIdx] );
   }
 
-  if ( key_called )
+  if ( key_called[winIdx] )
   {
-    bitmapPrintf ( "Key %d:  %d(%c) %d %d\n", key_seq, key_key, key_key, key_x, key_y );
+    bitmapPrintf ( "Key %d:  %d(%c) %d %d\n", key_seq[winIdx], key_key[winIdx], key_key[winIdx], key_x[winIdx], key_y[winIdx] );
   }
 
-  if ( special_called )
+  if ( special_called[winIdx] )
   {
-    bitmapPrintf ( "Special %d:  %d(%c) %d %d\n", special_seq, special_key, special_key, special_x, special_y );
+    bitmapPrintf ( "Special %d:  %d(%c) %d %d\n", special_seq[winIdx], special_key[winIdx], special_key[winIdx], special_x[winIdx], special_y[winIdx] );
   }
 
-  if ( visibility_called )
+  if ( visibility_called[winIdx] )
   {
-    bitmapPrintf ( "Visibility %d:  %d\n", visibility_seq, visibility_vis );
+    bitmapPrintf ( "Visibility %d:  %d\n", visibility_seq[winIdx], visibility_vis[winIdx] );
   }
 
-  if ( keyup_called )
+  if ( keyup_called[winIdx] )
   {
-    bitmapPrintf ( "Key Up %d:  %d(%c) %d %d\n", keyup_seq, keyup_key, keyup_key, keyup_x, keyup_y );
+    bitmapPrintf ( "Key Up %d:  %d(%c) %d %d\n", keyup_seq[winIdx], keyup_key[winIdx], keyup_key[winIdx], keyup_x[winIdx], keyup_y[winIdx] );
   }
 
-  if ( specialup_called )
+  if ( specialup_called[winIdx] )
   {
-    bitmapPrintf ( "Special Up %d:  %d(%c) %d %d\n", specialup_seq, specialup_key, specialup_key, specialup_x, specialup_y );
+    bitmapPrintf ( "Special Up %d:  %d(%c) %d %d\n", specialup_seq[winIdx], specialup_key[winIdx], specialup_key[winIdx], specialup_x[winIdx], specialup_y[winIdx] );
   }
 
-  if ( joystick_called )
+  if ( joystick_called[winIdx] )
   {
-    bitmapPrintf ( "Joystick %d:  %d %d %d %d\n", joystick_seq, joystick_a, joystick_b, joystick_c, joystick_d );
+    bitmapPrintf ( "Joystick %d:  %d %d %d %d\n", joystick_seq[winIdx], joystick_a[winIdx], joystick_b[winIdx], joystick_c[winIdx], joystick_d[winIdx] );
   }
 
-  if ( mouse_called )
+  if ( mouse_called[winIdx] )
   {
-    bitmapPrintf ( "Mouse %d:  %d %d %d %d\n", mouse_seq, mouse_button, mouse_updown, mouse_x, mouse_y );
+    bitmapPrintf ( "Mouse %d:  %d %d %d %d\n", mouse_seq[winIdx], mouse_button[winIdx], mouse_updown[winIdx], mouse_x[winIdx], mouse_y[winIdx] );
   }
 
-  if ( mousewheel_called )
+  if ( mousewheel_called[winIdx] )
   {
-    bitmapPrintf ( "Mouse Wheel %d:  %d %d %d %d\n", mousewheel_seq, mousewheel_number, mousewheel_direction, mousewheel_x, mousewheel_y );
+    bitmapPrintf ( "Mouse Wheel %d:  %d %d %d %d\n", mousewheel_seq[winIdx], mousewheel_number[winIdx], mousewheel_direction[winIdx], mousewheel_x[winIdx], mousewheel_y[winIdx] );
   }
 
-  if ( motion_called )
+  if ( motion_called[winIdx] )
   {
-    bitmapPrintf ( "Motion %d:  %d %d\n", motion_seq, motion_x, motion_y );
+    bitmapPrintf ( "Motion %d:  %d %d\n", motion_seq[winIdx], motion_x[winIdx], motion_y[winIdx] );
   }
 
-  if ( passivemotion_called )
+  if ( passivemotion_called[winIdx] )
   {
-    bitmapPrintf ( "Passive Motion %d:  %d %d\n", passivemotion_seq, passivemotion_x, passivemotion_y );
+    bitmapPrintf ( "Passive Motion %d:  %d %d\n", passivemotion_seq[winIdx], passivemotion_x[winIdx], passivemotion_y[winIdx] );
   }
 
   glMatrixMode ( GL_PROJECTION );
@@ -127,163 +173,202 @@ Display(void)
   glutSwapBuffers();
 }
 
+static void
+Warning(const char *fmt, va_list ap)
+{
+    printf("%6d Warning callback:\n");
+
+    /* print warning message */
+    vprintf(fmt, ap);
+}
+
+static void
+Error(const char *fmt, va_list ap)
+{
+    char dummy_string[STRING_LENGTH];
+    printf("%6d Error callback:\n");
+
+    /* print warning message */
+    vprintf(fmt, ap);
+
+    /* terminate program, after pause for input so user can see */
+    printf ( "Please enter something to exit: " );
+    fgets ( dummy_string, STRING_LENGTH, stdin );
+
+    /* Call exit directly as freeglut is messed
+     * up internally when an error is called. 
+     */
+    exit(1);
+}
+
 static void 
 Reshape(int width, int height)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Reshape Callback:  %d %d\n",
             ++sequence_number, window, width, height ) ;
-  reshape_called = 1 ;
-  reshape_width = width ;
-  reshape_height = height ;
-  reshape_seq = sequence_number ;
+  reshape_called[winIdx] = 1 ;
+  reshape_width[winIdx] = width ;
+  reshape_height[winIdx] = height ;
+  reshape_seq[winIdx] = sequence_number ;
+  glViewport(0,0,width,height);
   glutPostRedisplay () ;
 }
 
 static void 
 Key(unsigned char key, int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Keyboard Callback:  %d %d %d\n",
             ++sequence_number, window, key, x, y ) ;
-  key_called = 1 ;
-  key_key = key ;
-  key_x = x ;
-  key_y = y ;
-  key_seq = sequence_number ;
+  key_called[winIdx] = 1 ;
+  key_key[winIdx] = key ;
+  key_x[winIdx] = x ;
+  key_y[winIdx] = y ;
+  key_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 Special(int key, int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Special Key Callback:  %d %d %d\n",
             ++sequence_number, window, key, x, y ) ;
-  special_called = 1 ;
-  special_key = key ;
-  special_x = x ;
-  special_y = y ;
-  special_seq = sequence_number ;
+  special_called[winIdx] = 1 ;
+  special_key[winIdx] = key ;
+  special_x[winIdx] = x ;
+  special_y[winIdx] = y ;
+  special_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 Visibility(int vis)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Visibility Callback:  %d\n",
             ++sequence_number, window, vis ) ;
-  visibility_called = 1 ;
-  visibility_vis = vis ;
-  visibility_seq = sequence_number ;
+  visibility_called[winIdx] = 1 ;
+  visibility_vis[winIdx] = vis ;
+  visibility_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 KeyUp(unsigned char key, int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Key Release Callback:  %d %d %d\n",
             ++sequence_number, window, key, x, y ) ;
-  keyup_called = 1 ;
-  keyup_key = key ;
-  keyup_x = x ;
-  keyup_y = y ;
-  keyup_seq = sequence_number ;
+  keyup_called[winIdx] = 1 ;
+  keyup_key[winIdx] = key ;
+  keyup_x[winIdx] = x ;
+  keyup_y[winIdx] = y ;
+  keyup_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 SpecialUp(int key, int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Special Key Release Callback:  %d %d %d\n",
             ++sequence_number, window, key, x, y ) ;
-  specialup_called = 1 ;
-  specialup_key = key ;
-  specialup_x = x ;
-  specialup_y = y ;
-  specialup_seq = sequence_number ;
+  specialup_called[winIdx] = 1 ;
+  specialup_key[winIdx] = key ;
+  specialup_x[winIdx] = x ;
+  specialup_y[winIdx] = y ;
+  specialup_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 Joystick( unsigned int a, int b, int c, int d)  /* Need meaningful names */
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Joystick Callback:  %d %d %d %d\n",
             ++sequence_number, window, a, b, c, d ) ;
-  joystick_called = 1 ;
-  joystick_a = a ;
-  joystick_b = b ;
-  joystick_c = c ;
-  joystick_d = d ;
-  joystick_seq = sequence_number ;
+  joystick_called[winIdx] = 1 ;
+  joystick_a[winIdx] = a ;
+  joystick_b[winIdx] = b ;
+  joystick_c[winIdx] = c ;
+  joystick_d[winIdx] = d ;
+  joystick_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 Mouse(int button, int updown, int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Mouse Click Callback:  %d %d %d %d\n",
             ++sequence_number, window, button, updown, x, y ) ;
-  mouse_called = 1 ;
-  mouse_button = button ;
-  mouse_updown = updown ;
-  mouse_x = x ;
-  mouse_y = y ;
-  mouse_seq = sequence_number ;
+  mouse_called[winIdx] = 1 ;
+  mouse_button[winIdx] = button ;
+  mouse_updown[winIdx] = updown ;
+  mouse_x[winIdx] = x ;
+  mouse_y[winIdx] = y ;
+  mouse_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 MouseWheel(int wheel_number, int direction, int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Mouse Wheel Callback:  %d %d %d %d\n",
             ++sequence_number, window, wheel_number, direction, x, y ) ;
-  mousewheel_called = 1 ;
-  mousewheel_number = wheel_number ;
-  mousewheel_direction = direction ;
-  mousewheel_x = x ;
-  mousewheel_y = y ;
-  mousewheel_seq = sequence_number ;
+  mousewheel_called[winIdx] = 1 ;
+  mousewheel_number[winIdx] = wheel_number ;
+  mousewheel_direction[winIdx] = direction ;
+  mousewheel_x[winIdx] = x ;
+  mousewheel_y[winIdx] = y ;
+  mousewheel_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 Motion(int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Mouse Motion Callback:  %d %d\n",
             ++sequence_number, window, x, y ) ;
-  motion_called = 1 ;
-  motion_x = x ;
-  motion_y = y ;
-  motion_seq = sequence_number ;
+  motion_called[winIdx] = 1 ;
+  motion_x[winIdx] = x ;
+  motion_y[winIdx] = y ;
+  motion_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 PassiveMotion(int x, int y)
 {
-  int window = glutGetWindow () ;
+  int winIdx;
+  int window = getWindowAndIdx(&winIdx);
   printf ( "%6d Window %d Mouse Passive Motion Callback:  %d %d\n",
             ++sequence_number, window, x, y ) ;
-  passivemotion_called = 1 ;
-  passivemotion_x = x ;
-  passivemotion_y = y ;
-  passivemotion_seq = sequence_number ;
+  passivemotion_called[winIdx] = 1 ;
+  passivemotion_x[winIdx] = x ;
+  passivemotion_y[winIdx] = y ;
+  passivemotion_seq[winIdx] = sequence_number ;
   glutPostRedisplay () ;
 }
 
 static void 
 Entry(int state)
 {
-  int window = glutGetWindow () ;
-  entry_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d Entry Callback:  %d\n",
             ++sequence_number, window, state ) ;
   glutPostRedisplay () ;
@@ -292,8 +377,7 @@ Entry(int state)
 static void 
 Close(void)
 {
-  int window = glutGetWindow () ;
-  close_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d Close Callback\n",
             ++sequence_number, window ) ;
 }
@@ -301,8 +385,7 @@ Close(void)
 static void 
 OverlayDisplay(void)
 {
-  int window = glutGetWindow () ;
-  overlaydisplay_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d OverlayDisplay Callback\n",
             ++sequence_number, window ) ;
   glutPostRedisplay () ;
@@ -311,8 +394,7 @@ OverlayDisplay(void)
 static void 
 WindowStatus(int state)
 {
-  int window = glutGetWindow () ;
-  windowstatus_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d WindowStatus Callback:  %d\n",
             ++sequence_number, window, state ) ;
   glutPostRedisplay () ;
@@ -321,8 +403,7 @@ WindowStatus(int state)
 static void 
 SpaceMotion(int x, int y, int z)
 {
-  int window = glutGetWindow () ;
-  spacemotion_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d SpaceMotion Callback:  %d %d %d\n",
             ++sequence_number, window, x, y, z ) ;
   glutPostRedisplay () ;
@@ -331,8 +412,7 @@ SpaceMotion(int x, int y, int z)
 static void 
 SpaceRotation(int x, int y, int z)
 {
-  int window = glutGetWindow () ;
-  spacerotation_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d SpaceRotation Callback:  %d %d %d\n",
             ++sequence_number, window, x, y, z ) ;
   glutPostRedisplay () ;
@@ -341,8 +421,7 @@ SpaceRotation(int x, int y, int z)
 static void 
 SpaceButton(int button, int updown)
 {
-  int window = glutGetWindow () ;
-  spacebutton_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d SpaceButton Callback:  %d %d\n",
             ++sequence_number, window, button, updown ) ;
   glutPostRedisplay () ;
@@ -351,8 +430,7 @@ SpaceButton(int button, int updown)
 static void 
 Dials(int x, int y)
 {
-  int window = glutGetWindow () ;
-  dials_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d Dials Callback:  %d %d\n",
             ++sequence_number, window, x, y ) ;
   glutPostRedisplay () ;
@@ -361,8 +439,7 @@ Dials(int x, int y)
 static void 
 ButtonBox(int button, int updown)
 {
-  int window = glutGetWindow () ;
-  buttonbox_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d ButtonBox Callback:  %d %d\n",
             ++sequence_number, window, button, updown ) ;
   glutPostRedisplay () ;
@@ -371,8 +448,7 @@ ButtonBox(int button, int updown)
 static void 
 TabletMotion(int x, int y)
 {
-  int window = glutGetWindow () ;
-  tabletmotion_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d TabletMotion Callback:  %d %d\n",
             ++sequence_number, window, x, y ) ;
   glutPostRedisplay () ;
@@ -381,38 +457,52 @@ TabletMotion(int x, int y)
 static void 
 TabletButton(int button, int updown, int x, int y)
 {
-  int window = glutGetWindow () ;
-  tabletbutton_called = 1 ;
+  int window = getWindowAndIdx(NULL);
   printf ( "%6d Window %d TabletButton Callback:  %d %d %d %d\n",
             ++sequence_number, window, button, updown, x, y ) ;
   glutPostRedisplay () ;
 }
 
 static void
-MenuCallback ( int menuID )
+MenuCallback ( int value )
 {
-  int window = glutGetWindow () ;
-  printf( "%6d Window %d MenuCallback - menuID is %d\n",
-          ++sequence_number, window, menuID );
+  int menu = glutGetMenu();
+  int window = getWindowAndIdx(NULL);
+  printf( "%6d Menu %d MenuCallback for menu opened in Window %d - value is %d\n",
+          ++sequence_number, menu, window, value );
 }
 
 static void 
 MenuDestroy( void )
 {
-  int window = glutGetWindow () ;
+  int menu = glutGetMenu();
   menudestroy_called = 1 ;
-  printf ( "%6d Window %d MenuDestroy Callback\n",
-            ++sequence_number, window ) ;
-  glutPostRedisplay () ;
+  printf ( "%6d Menu %d MenuDestroy Callback\n",
+            ++sequence_number, menu ) ;
 }
 
 static void 
 MenuStatus( int status, int x, int y )
 {
-  int window = glutGetWindow () ;
-  menudestroy_called = 1 ;
-  printf ( "%6d Window %d MenuStatus Callback:  %d %d %d\n",
-            ++sequence_number, window, status, x, y ) ;
+  /* Menu and window for which this event is triggered are current when the callback is called */
+  int menu = glutGetMenu();
+  int window = getWindowAndIdx(NULL);
+  menustatus_called = 1 ;
+  printf ( "%6d Menu %d MenuStatus Callback in Window %d:  %d %d %d\n",
+            ++sequence_number, menu, window, status, x, y ) ;
+  glutPostRedisplay () ;
+}
+
+
+static void 
+MenuState( int status )
+{
+  /* Menu and window for which this event is triggered are current when the callback is called */
+  int menu = glutGetMenu();
+  int window = getWindowAndIdx(NULL);
+  menustate_called = 1 ;
+  printf ( "%6d Menu %d MenuState Callback in Window %d:  %d\n",
+            ++sequence_number, menu, window, status) ;
   glutPostRedisplay () ;
 }
 
@@ -424,22 +514,29 @@ static void Idle ( void )
 int 
 main(int argc, char *argv[])
 {
-#define STRING_LENGTH   10
-  int freeglut_window, aux_window ;
   char dummy_string[STRING_LENGTH];
 
   int menuID, subMenuA, subMenuB;
 
+  glutInitWarningFunc(Warning);
+  glutInitErrorFunc(Error);
   glutInitWindowSize(500, 250);
   glutInitWindowPosition ( 140, 140 );
   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE );
   glutInit(&argc, argv);
+  glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE,GLUT_ACTION_CONTINUE_EXECUTION);
+
+  /* Set other global callback (global as in not associated with any specific menu or window) */
+  glutIdleFunc ( Idle );
+  glutMenuStatusFunc ( MenuStatus );
+  glutMenuStateFunc  ( MenuState ); /* Note that glutMenuStatusFunc is an enhanced version of the deprecated glutMenuStateFunc. */
 
-  freeglut_window = glutCreateWindow( "Callback Demo" );
-  printf ( "Creating window %d as 'Callback Demo'\n", freeglut_window ) ;
+  windows[0] = glutCreateWindow( "Callback Demo" );
+  printf ( "Creating window %d as 'Callback Demo'\n", windows[0] ) ;
 
   glClearColor(1.0, 1.0, 1.0, 1.0);
 
+  /* callbacks and settings specific to this window */
   glutDisplayFunc( Display );
   glutReshapeFunc( Reshape );
   glutKeyboardFunc( Key );
@@ -463,37 +560,41 @@ main(int argc, char *argv[])
   glutDialsFunc ( Dials ) ;
   glutTabletMotionFunc ( TabletMotion ) ;
   glutTabletButtonFunc ( TabletButton ) ;
-  glutMenuDestroyFunc ( MenuDestroy );
-  glutMenuStatusFunc ( MenuStatus );
   glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF) ;
 
   subMenuA = glutCreateMenu( MenuCallback );
-  glutAddMenuEntry( "Sub menu A1 (01)", 1 );
-  glutAddMenuEntry( "Sub menu A2 (02)", 2 );
-  glutAddMenuEntry( "Sub menu A3 (03)", 3 );
+  glutAddMenuEntry( "Sub menu A1 (01)", 11 );
+  glutAddMenuEntry( "Sub menu A2 (02)", 12 );
+  glutAddMenuEntry( "Sub menu A3 (03)", 13 );
+  glutMenuDestroyFunc ( MenuDestroy );  /* callback specific to this menu */
 
   subMenuB = glutCreateMenu( MenuCallback );
-  glutAddMenuEntry( "Sub menu B1 (04)", 4 );
-  glutAddMenuEntry( "Sub menu B2 (05)", 5 );
-  glutAddMenuEntry( "Sub menu B3 (06)", 6 );
+  glutAddMenuEntry( "Sub menu B1 (04)", 14 );
+  glutAddMenuEntry( "Sub menu B2 (05)", 15 );
+  glutAddMenuEntry( "Sub menu B3 (06)", 16 );
   glutAddSubMenu( "Going to sub menu A", subMenuA );
+  glutMenuDestroyFunc ( MenuDestroy );  /* callback specific to this menu */
 
   menuID = glutCreateMenu( MenuCallback );
-  glutAddMenuEntry( "Entry one",   1 );
-  glutAddMenuEntry( "Entry two",   2 );
-  glutAddMenuEntry( "Entry three", 3 );
-  glutAddMenuEntry( "Entry four",  4 );
-  glutAddMenuEntry( "Entry five",  5 );
+  glutAddMenuEntry( "Entry one",   21 );
+  glutAddMenuEntry( "Entry two",   22 );
+  glutAddMenuEntry( "Entry three", 23 );
+  glutAddMenuEntry( "Entry four",  24 );
+  glutAddMenuEntry( "Entry five",  25 );
   glutAddSubMenu( "Enter sub menu A", subMenuA );
   glutAddSubMenu( "Enter sub menu B", subMenuB );
+  glutMenuDestroyFunc ( MenuDestroy );  /* callback specific to this menu */
 
   glutAttachMenu( GLUT_LEFT_BUTTON );
 
-  aux_window = glutCreateWindow( "Second Window" );
-  printf ( "Creating window %d as 'Second Window'\n", aux_window ) ;
+  glutInitWindowPosition ( 140+500+2*glutGet(GLUT_WINDOW_BORDER_WIDTH), 140 );
+  /* Position second window right next to the first */
+  windows[1] = glutCreateWindow( "Second Window" );
+  printf ( "Creating window %d as 'Second Window'\n", windows[1] ) ;
 
   glClearColor(1.0, 1.0, 1.0, 1.0);
 
+  /* callbacks and settings specific to this window */
   glutDisplayFunc( Display );
   glutReshapeFunc( Reshape );
   glutKeyboardFunc( Key );
@@ -519,7 +620,9 @@ main(int argc, char *argv[])
   glutTabletButtonFunc ( TabletButton ) ;
   glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF) ;
 
-  glutIdleFunc ( Idle );
+  glutSetMenu(subMenuB);
+  glutAttachMenu( GLUT_RIGHT_BUTTON );
+
 
   printf ( "Please enter something to continue: " );
   fgets ( dummy_string, STRING_LENGTH, stdin );
@@ -528,5 +631,5 @@ main(int argc, char *argv[])
 
   printf ( "Back from the 'freeglut' main loop\n" ) ;
 
-  return 0;             /* ANSI C requires main to return int. */
+  return EXIT_SUCCESS;
 }