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eBookReaderSwitch/thirdparty/freeglut/progs/demos/CallbackMaker/CallbackMaker.c

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/* CallbackMaker.c */
/*
* Program to invoke all the callbacks that "freeglut" supports
*/
#include <GL/freeglut.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
static int sequence_number = 0 ;
#define CALLBACKMAKER_N_WINDOWS 4
int windows[CALLBACKMAKER_N_WINDOWS] = {0};
/* define status vars showing whether given callback has been called for given window */
#define CALLBACK_CALLED_VAR(name) int name##_called[CALLBACKMAKER_N_WINDOWS] = {0}
#define CALLBACK_0V(name) int name##_seq[CALLBACKMAKER_N_WINDOWS] = {-1}; CALLBACK_CALLED_VAR(name)
#define CALLBACK_1V(name,field) int name##_##field[CALLBACKMAKER_N_WINDOWS] = {-1}; CALLBACK_0V(name)
#define CALLBACK_2V(name,field1,field2) int name##_##field2[CALLBACKMAKER_N_WINDOWS] = {-1}; CALLBACK_1V(name,field1)
#define CALLBACK_3V(name,field1,field2,field3) int name##_##field3[CALLBACKMAKER_N_WINDOWS] = {-1}; CALLBACK_2V(name,field1,field2)
#define CALLBACK_4V(name,field1,field2,field3,field4) int name##_##field4[CALLBACKMAKER_N_WINDOWS] = {-1}; CALLBACK_3V(name,field1,field2,field3)
#define CALLBACK_5V(name,field1,field2,field3,field4,field5) int name##_##field5[CALLBACKMAKER_N_WINDOWS] = {-1}; CALLBACK_4V(name,field1,field2,field3,field4)
CALLBACK_2V(reshape,width,height);
CALLBACK_2V(position,top,left);
CALLBACK_1V(visibility,vis);
CALLBACK_1V(windowStatus,state);
CALLBACK_4V(key,key,x,y,mod);
CALLBACK_4V(keyup,key,x,y,mod);
CALLBACK_4V(special,key,x,y,mod);
CALLBACK_4V(specialup,key,x,y,mod);
CALLBACK_4V(joystick,a,b,c,d);
CALLBACK_5V(mouse,button,updown,x,y,mod);
CALLBACK_5V(mousewheel,number,direction,x,y,mod);
CALLBACK_3V(motion,x,y,mod);
CALLBACK_3V(passivemotion,x,y,mod);
CALLBACK_1V(entry,state);
CALLBACK_0V(close);
/* 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, ...)
{
static char buf[256];
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 :
window==windows[1] ? 1 :
window==windows[2] ? 2 : 3;
return window;
}
static void
Mod2Text(int mods, char *text)
{
if (mods&GLUT_ACTIVE_CTRL)
strcat(text,"CTRL");
if (mods&GLUT_ACTIVE_SHIFT)
{
if (text[0])
strcat(text,"+SHIFT");
else
strcat(text,"SHIFT");
}
if (mods&GLUT_ACTIVE_ALT)
{
if (text[0])
strcat(text,"+ALT");
else
strcat(text,"ALT");
}
if (!text[0])
strcat(text,"none");
}
static void
Display(void)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
glClear ( GL_COLOR_BUFFER_BIT );
glDisable ( GL_DEPTH_TEST );
glMatrixMode ( GL_PROJECTION );
glPushMatrix();
glLoadIdentity();
glOrtho(0, glutGet ( GLUT_WINDOW_WIDTH ),
0, glutGet ( GLUT_WINDOW_HEIGHT ), -1, 1 );
glMatrixMode ( GL_MODELVIEW );
glPushMatrix ();
glLoadIdentity ();
glColor3ub ( 0, 0, 0 );
glRasterPos2i ( 10, glutGet ( GLUT_WINDOW_HEIGHT ) - 20 ); /* 10pt margin above 10pt letters */
if ( entry_called[winIdx] )
{
bitmapPrintf ( "Entry %d: %d\n", entry_seq[winIdx], entry_state[winIdx] );
}
if ( visibility_called[winIdx] )
{
bitmapPrintf ( "Visibility %d: %d\n", visibility_seq[winIdx], visibility_vis[winIdx] );
}
if ( windowStatus_called[winIdx] )
{
bitmapPrintf ( "WindowStatus %d: %d\n", windowStatus_seq[winIdx], windowStatus_state[winIdx] );
}
if ( reshape_called[winIdx] )
{
bitmapPrintf ( "Reshape %d: %d %d\n", reshape_seq[winIdx], reshape_width[winIdx], reshape_height[winIdx] );
}
if ( position_called[winIdx] )
{
bitmapPrintf ( "Position %d: %d %d\n", position_seq[winIdx], position_left[winIdx], position_top[winIdx] );
}
if ( key_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(key_mod[winIdx],mods);
bitmapPrintf ( "Key %d: %d(%c) %d %d (mod: %s)\n", key_seq[winIdx], key_key[winIdx], key_key[winIdx], key_x[winIdx], key_y[winIdx], mods );
}
if ( keyup_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(keyup_mod[winIdx],mods);
bitmapPrintf ( "Key Up %d: %d(%c) %d %d (mod: %s)\n", keyup_seq[winIdx], keyup_key[winIdx], keyup_key[winIdx], keyup_x[winIdx], keyup_y[winIdx], mods );
}
if ( special_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(special_mod[winIdx],mods);
bitmapPrintf ( "Special %d: %d(%c) %d %d (mod: %s)\n", special_seq[winIdx], special_key[winIdx], special_key[winIdx], special_x[winIdx], special_y[winIdx], mods );
}
if ( specialup_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(specialup_mod[winIdx],mods);
bitmapPrintf ( "Special Up %d: %d(%c) %d %d (mod: %s)\n", specialup_seq[winIdx], specialup_key[winIdx], specialup_key[winIdx], specialup_x[winIdx], specialup_y[winIdx], mods );
}
if ( joystick_called[winIdx] )
{
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[winIdx] )
{
char mods[50] = {0};
Mod2Text(mouse_mod[winIdx],mods);
bitmapPrintf ( "Mouse %d: %d %d %d %d (mod: %s)\n", mouse_seq[winIdx], mouse_button[winIdx], mouse_updown[winIdx], mouse_x[winIdx], mouse_y[winIdx], mods );
}
if ( mousewheel_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(mousewheel_mod[winIdx],mods);
bitmapPrintf ( "Mouse Wheel %d: %d %d %d %d (mod: %s)\n", mousewheel_seq[winIdx], mousewheel_number[winIdx], mousewheel_direction[winIdx], mousewheel_x[winIdx], mousewheel_y[winIdx], mods );
}
if ( motion_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(motion_mod[winIdx],mods);
bitmapPrintf ( "Motion %d: %d %d (mod: %s)\n", motion_seq[winIdx], motion_x[winIdx], motion_y[winIdx], mods );
}
if ( passivemotion_called[winIdx] )
{
char mods[50] = {0};
Mod2Text(passivemotion_mod[winIdx],mods);
bitmapPrintf ( "Passive Motion %d: %d %d (mod: %s)\n", passivemotion_seq[winIdx], passivemotion_x[winIdx], passivemotion_y[winIdx], mods );
}
glMatrixMode ( GL_PROJECTION );
glPopMatrix ();
glMatrixMode ( GL_MODELVIEW );
glPopMatrix ();
glEnable ( GL_DEPTH_TEST );
printf ( "%6d Window %d Display Callback\n",
++sequence_number, window ) ;
glutSwapBuffers();
}
static void
Warning(const char *fmt, va_list ap)
{
printf("%6d Warning callback:\n",++sequence_number);
/* 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",++sequence_number);
/* print warning message */
vprintf(fmt, ap);
printf("\n");
/* 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 winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Reshape Callback: %d %d\n",
++sequence_number, window, width, height ) ;
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
Position(int left, int top)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Position Callback: %d %d\n",
++sequence_number, window, left, top ) ;
position_called[winIdx] = 1 ;
position_left[winIdx] = left ;
position_top[winIdx] = top ;
position_seq[winIdx] = sequence_number ;
glutPostRedisplay () ;
}
static void
Key(unsigned char key, int x, int y)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Keyboard Callback: %d %d %d\n",
++sequence_number, window, key, x, y ) ;
key_called[winIdx] = 1 ;
key_key[winIdx] = key ;
key_x[winIdx] = x ;
key_y[winIdx] = y ;
key_seq[winIdx] = sequence_number ;
key_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
KeyUp(unsigned char key, int x, int y)
{
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[winIdx] = 1 ;
keyup_key[winIdx] = key ;
keyup_x[winIdx] = x ;
keyup_y[winIdx] = y ;
keyup_seq[winIdx] = sequence_number ;
keyup_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
Special(int key, int x, int y)
{
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[winIdx] = 1 ;
special_key[winIdx] = key ;
special_x[winIdx] = x ;
special_y[winIdx] = y ;
special_seq[winIdx] = sequence_number ;
special_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
SpecialUp(int key, int x, int y)
{
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[winIdx] = 1 ;
specialup_key[winIdx] = key ;
specialup_x[winIdx] = x ;
specialup_y[winIdx] = y ;
specialup_seq[winIdx] = sequence_number ;
specialup_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
Joystick( unsigned int a, int b, int c, int d) /* Need meaningful names */
{
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[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 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[winIdx] = 1 ;
mouse_button[winIdx] = button ;
mouse_updown[winIdx] = updown ;
mouse_x[winIdx] = x ;
mouse_y[winIdx] = y ;
mouse_seq[winIdx] = sequence_number ;
mouse_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
MouseWheel(int wheel_number, int direction, int x, int y)
{
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[winIdx] = 1 ;
mousewheel_number[winIdx] = wheel_number ;
mousewheel_direction[winIdx] = direction ;
mousewheel_x[winIdx] = x ;
mousewheel_y[winIdx] = y ;
mousewheel_seq[winIdx] = sequence_number ;
mousewheel_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
Motion(int x, int y)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Mouse Motion Callback: %d %d\n",
++sequence_number, window, x, y ) ;
motion_called[winIdx] = 1 ;
motion_x[winIdx] = x ;
motion_y[winIdx] = y ;
motion_seq[winIdx] = sequence_number ;
motion_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
PassiveMotion(int x, int y)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Mouse Passive Motion Callback: %d %d\n",
++sequence_number, window, x, y ) ;
passivemotion_called[winIdx] = 1 ;
passivemotion_x[winIdx] = x ;
passivemotion_y[winIdx] = y ;
passivemotion_seq[winIdx] = sequence_number ;
passivemotion_mod[winIdx] = glutGetModifiers() ;
glutPostRedisplay () ;
}
static void
Entry(int state)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Entry Callback: %d\n",
++sequence_number, window, state ) ;
entry_called[winIdx] = 1 ;
entry_seq[winIdx] = sequence_number;
entry_state[winIdx] = state;
glutPostRedisplay () ;
}
static void
Close(void)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d Close Callback\n",
++sequence_number, window ) ;
}
static void
OverlayDisplay(void)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d OverlayDisplay Callback\n",
++sequence_number, window ) ;
glutPostRedisplay () ;
}
static void
Visibility(int vis)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d Visibility Callback: %d\n",
++sequence_number, window, vis ) ;
visibility_called[winIdx] = 1 ;
visibility_vis[winIdx] = vis ;
visibility_seq[winIdx] = sequence_number ;
glutPostRedisplay () ;
}
static void
WindowStatus(int state)
{
int winIdx;
int window = getWindowAndIdx(&winIdx);
printf ( "%6d Window %d WindowStatus Callback: %d\n",
++sequence_number, window, state ) ;
windowStatus_called[winIdx] = 1 ;
windowStatus_state[winIdx] = state ;
windowStatus_seq[winIdx] = sequence_number ;
glutPostRedisplay () ;
}
static void
SpaceMotion(int x, int y, int z)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d SpaceMotion Callback: %d %d %d\n",
++sequence_number, window, x, y, z ) ;
glutPostRedisplay () ;
}
static void
SpaceRotation(int x, int y, int z)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d SpaceRotation Callback: %d %d %d\n",
++sequence_number, window, x, y, z ) ;
glutPostRedisplay () ;
}
static void
SpaceButton(int button, int updown)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d SpaceButton Callback: %d %d\n",
++sequence_number, window, button, updown ) ;
glutPostRedisplay () ;
}
static void
Dials(int x, int y)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d Dials Callback: %d %d\n",
++sequence_number, window, x, y ) ;
glutPostRedisplay () ;
}
static void
ButtonBox(int button, int updown)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d ButtonBox Callback: %d %d\n",
++sequence_number, window, button, updown ) ;
glutPostRedisplay () ;
}
static void
TabletMotion(int x, int y)
{
int window = getWindowAndIdx(NULL);
printf ( "%6d Window %d TabletMotion Callback: %d %d\n",
++sequence_number, window, x, y ) ;
glutPostRedisplay () ;
}
static void
TabletButton(int button, int updown, int x, int y)
{
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 value )
{
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 menu = glutGetMenu();
menudestroy_called = 1 ;
printf ( "%6d Menu %d MenuDestroy Callback\n",
++sequence_number, menu ) ;
}
static void
MenuStatus( int status, int x, int 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 () ;
}
static void Idle ( void )
{
++sequence_number ;
}
static void SetWindowCallbacks( int first )
{
/* All these callbacks are set for only the current window */
glutDisplayFunc( Display );
glutReshapeFunc( Reshape );
glutPositionFunc( Position );
glutKeyboardFunc( Key );
glutSpecialFunc( Special );
glutKeyboardUpFunc( KeyUp );
glutSpecialUpFunc( SpecialUp );
if (first)
glutJoystickFunc( Joystick, 100 );
glutMouseFunc ( Mouse ) ;
glutMouseWheelFunc ( MouseWheel ) ;
glutMotionFunc ( Motion ) ;
glutPassiveMotionFunc ( PassiveMotion ) ;
glutEntryFunc ( Entry ) ;
glutCloseFunc ( Close ) ;
glutOverlayDisplayFunc ( OverlayDisplay ) ;
glutSpaceballMotionFunc ( SpaceMotion ) ;
glutSpaceballRotateFunc ( SpaceRotation ) ;
glutSpaceballButtonFunc ( SpaceButton ) ;
glutButtonBoxFunc ( ButtonBox ) ;
glutDialsFunc ( Dials ) ;
glutTabletMotionFunc ( TabletMotion ) ;
glutTabletButtonFunc ( TabletButton ) ;
/* glutVisibilityFunc is deprecated in favor of glutWindowStatusFunc, which provides more detail.
* Setting one of these overwrites the other (see docs).
*/
glutVisibilityFunc ( Visibility ); /* This will thus never be called, as glutWindowStatusFunc is set afterwards */
glutWindowStatusFunc ( WindowStatus ) ;
}
int
main(int argc, char *argv[])
{
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);
/* global setting: mainloop does not return when a window is closed, only returns when all windows are closed */
glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE,GLUT_ACTION_CONTINUE_EXECUTION);
/* global setting: repeated keys generating by keeping the key pressed down are passed on to the keyboard callback */
/* There are two functions to control this behavior, glutSetKeyRepeat to set it globally, and glutIgnoreKeyRepeat to set it per window.
* These two interact however. If key repeat is globally switched off (glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF)), it cannot be overridden
* (switched back on) for a specific window with glutIgnoreKeyRepeat. However, if key repeat is globally switched on
* (glutSetKeyRepeat(GLUT_KEY_REPEAT_ON)), it can be overridden (switched off) with glutIgnoreKeyRepeat on a per-window basis. That is
* what we demonstrate here.
*/
glutSetKeyRepeat(GLUT_KEY_REPEAT_ON);
/* 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. */
/* Open first 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, settings and menus for this window */
SetWindowCallbacks( 1 );
glutIgnoreKeyRepeat(GL_TRUE);
glutSetIconTitle("Icon Test - Callback Demo");
subMenuA = glutCreateMenu( MenuCallback );
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 */
/* Change font for this menu */
glutSetMenuFont(subMenuA, GLUT_BITMAP_HELVETICA_12);
subMenuB = glutCreateMenu( MenuCallback );
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 */
glutSetMenuFont(subMenuB, GLUT_BITMAP_9_BY_15);
menuID = glutCreateMenu( MenuCallback );
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 );
/* Position second window right next to the first */
glutInitWindowPosition ( 140+500+2*glutGet(GLUT_WINDOW_BORDER_WIDTH), 140 );
glutInitWindowSize(600, 600);
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, settings and menus for this window */
SetWindowCallbacks( 0 );
glutIgnoreKeyRepeat(GL_TRUE);
glutSetMenu(subMenuB);
glutAttachMenu( GLUT_RIGHT_BUTTON );
/* position a third window as a subwindow of the second */
windows[2] = glutCreateSubWindow(windows[1],0,300,600,300);
printf ( "Creating window %d as subwindow to 'Second Window'\n", windows[2] ) ;
glClearColor(0.7f, 0.7f, 0.7f, 1.0);
/* callbacks, settings and menus for this window */
SetWindowCallbacks( 0 );
glutSetCursor(GLUT_CURSOR_CROSSHAIR); /* Cursors are per window */
glutSetMenu(subMenuA);
glutAttachMenu( GLUT_RIGHT_BUTTON );
/* position a fourth window as a subsubwindow (grandchild) of the second */
windows[3] = glutCreateSubWindow(windows[2],300,0,300,300);
printf ( "Creating window %d as subsubwindow to 'Second Window'\n", windows[3] ) ;
glClearColor(0.4f, 0.4f, 0.4f, 1.0);
/* callbacks and menus for this window */
SetWindowCallbacks( 0 );
glutSetCursor(GLUT_CURSOR_INHERIT); /* Inherit cursor look from parent (this is default on window creation) - comment the below to see in action */
glutSetCursor(GLUT_CURSOR_CYCLE);
printf ( "Please enter something to continue: " );
fgets ( dummy_string, STRING_LENGTH, stdin );
glutMainLoop();
printf ( "Back from the 'freeglut' main loop\n" ) ;
return EXIT_SUCCESS;
}
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