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problem with glutChangeToMenuEntry

Hi!

I'm using glut/OpenGLin a scientific visualization program.
The code runs on the Sun, SGI, Linux, windows in Cygwin.

It runs on MacOSX but I have one major problem.
The command "glutChangeToMenuEntry" only works on the
top level menu and not on the submenus. (This command is suppossed to change the text of
a menu item. It does this on the top level menu, but not on the submenus.
Printing out the parameters indicates that the menuID and place is correct.
All code associated with the menu selection is executed correctly
except for the change to the menu text).


The problem also exists in the glut sample code progs/contrib/lineblend.c
which is distributed with glut tar files.

I am using macOSX 10.2 (though the problem exists in 10.3 also).
I am using the MacOSX framework for glut and openGL.
I am running on a duel processor G4 (the problem also
exists on the laptops running macOS 10.3 that  we've tried).

Below,  I enclose the programs:
1)  lineblend.c which is from the original glut distribution of sample
  programs under progs/contrib.
  This shows that glutChangeToMenuEntry does not work on submenus
   in MacOSX. (It works in all other operating systems.)
   Included is also the compile line, run in a terminal.
2) decal.c can be obtained from  the examples in the MacOSX
distribution  /Developer/Examples/OpenGL/Glut
This  shows that glutChangeToMenuEntry does work on the first level
menu.

What must be done to make glutChangeToMenuEntry work?
Does a complete glut  distribution (tarred and gzipped) exist for macOSX
which will run on 10.2 and 10.3?

Thanks,
ew

---------------------------------

---------begin lineblend.c from glut distribution progs/contrib/-------------

/* lineblend.c
*
* To compile: cc -o lineblend lineblend.c -lGL -lGLU -lX11 -lglut -lXmu
*
* Usage: lineblend
*
* This is an puffed up version of the first GL assignment we had for my
* graphics class: write a 2-d openGL program w/ color and interactivity.
*
* Left and middle buttons drawn colored lines, right button brings up a menu
* with a few options. If you draw for long enough and then hit pick
* "redraw" (or resize or uncover the window) it takes so long to redraw
* all the lines it is kind of like a kaleidoscope animation. Or something.
*
* Philip Winston - 2/11/95 (modified: 2/12)
* email@hidden
* http://www.cs.hmc.edu/people/pwinston
* */

/* Changed for MacOSX */
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <GLUT/glut.h>
void myreshape(int, int);

#include <stdio.h>
#include <stdlib.h>

#ifdef WIN32
#define drand48() (((float) rand())/((float) RAND_MAX))
#endif

typedef enum {MENU_ALPHA_1, MENU_ALPHA_2,  MENU_ALPHA_3, MENU_ALPHA_4,
             MENU_COLOR_1, MENU_COLOR_2,  MENU_COLOR_3, MENU_COLOR_4,
             MENU_ANTI_ON, MENU_ANTI_OFF,
             MENU_ERASE,   MENU_REDRAW,   MENU_QUIT} MenuChoices;

typedef enum {SC1, SC2, SC3, SC4} ColorScheme;

int wwidth, wheight, downbtn = -1, downx, downy;

GLuint DispLists = 1;

GLfloat Alpha = 0.2;
int Color = SC1;

void myglInit(void)
{
 glLineWidth(10.0);
 glEnable(GL_BLEND);
 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();
 gluOrtho2D(-0.5,0.5,-0.5,0.5);

 glMatrixMode(GL_MODELVIEW);
 glLoadIdentity();

 glFlush();
}

/* changed for macOSX
void myreshape(GLsizei w, GLsizei h)
*/
void myreshape(int w, int h)
{
 wwidth = w; wheight = h;
 glViewport(0,0,w,h);
 glClear(GL_COLOR_BUFFER_BIT);
 glFlush();
}

void mydisplay(void)
{
 GLuint i;

 glClear(GL_COLOR_BUFFER_BIT);

 for (i = 0; i < DispLists; i++)
   glCallList(i);
 glFlush();
}

void drawline(int x, int y)
{
 GLfloat fx =   (float)(x - downx)/wwidth,
         fy = -((float)(y - downy)/wheight),
         r1, g1, b1, r2, g2, b2;

 switch(Color) {      /* four different ways to pick colors */
   case SC1:          /* just kind of random formulas...    */
     r1 = fy+1; g1 = 0;    b1 = (float)x/wwidth;
     r2 = 0;    g2 = fy+1; b2 = 1-(float)x/wwidth;
     break;
   case SC2:
     r1 = fx+fy+1; g1 = 0;       b1 = 0;
     r2 = 0;       g2 = fx+fy+1; b2 = 0;
     break;
   case SC3:
     r1 = 0;   g1 = (float)downx/wwidth; b1 = (float)x/wwidth;
     r2 = 0;   g2 = (float)y/wheight; b2 = (float)downy/wheight;
     break;
   case SC4:
     r1 = drand48(); g1 = drand48(); b1 = (float)downx/(wwidth*1.5);
     r2 = drand48(); g2 = (float)downy/(wheight*1.5); b2 = drand48();
     break;
 }


glBegin(GL_LINES);
glColor4f(r1, g1, b1, Alpha);
switch(downbtn) {
case GLUT_LEFT_BUTTON: glVertex2f(0,0); break; case GLUT_MIDDLE_BUTTON: glVertex2f(-fx,-fy); break;
}
glColor4f(r2, g2, b2, Alpha); glVertex2f(fx,fy);
glEnd();

 glFlush();
}

void mousebutton(int btn, int state, int x, int y)
{
 GLfloat fx =  (float)x/wwidth - 0.5,
         fy = -(float)y/wheight + 0.5;

 if (state == GLUT_DOWN && downbtn == -1) {
   glNewList(DispLists++, GL_COMPILE_AND_EXECUTE);
   glPushMatrix();
   glTranslatef(fx, fy, 0);
   downbtn = btn;
   downx = x;
   downy = y;
   drawline(x, y);
 } else if (state == GLUT_UP && btn == downbtn) {
   glPopMatrix();
   glEndList();
   downbtn = -1;
 }
}

/*
* For some reason I felt like doing these check boxes -- it is kind of
* lame the way I did it, though. Probably a smarter and easier way.
*/
void handlealphamenu(int value)
{
glutChangeToMenuEntry(1,"[ ] 0.05", MENU_ALPHA_1); glutChangeToMenuEntry(2,"[ ] 0.20", MENU_ALPHA_2);
glutChangeToMenuEntry(3,"[ ] 0.50", MENU_ALPHA_3);
glutChangeToMenuEntry(4,"[ ] 1.00", MENU_ALPHA_4);
switch (value) {
case MENU_ALPHA_1:
glutChangeToMenuEntry(1, "[ * ] 0.05", MENU_ALPHA_1); Alpha = 0.05; break;
case MENU_ALPHA_2:
glutChangeToMenuEntry(2, "[ * ] 0.20", MENU_ALPHA_2);
Alpha = 0.2; break;
case MENU_ALPHA_3:
glutChangeToMenuEntry(3, "[ * ] 0.50", MENU_ALPHA_3);
Alpha = 0.5; break;
case MENU_ALPHA_4:
glutChangeToMenuEntry(4, "[ * ] 1.00", MENU_ALPHA_4);
Alpha = 1.0; break;
}
}

void handlecolormenu(int value)
{
glutChangeToMenuEntry(1,"[ ] Various", MENU_COLOR_1); glutChangeToMenuEntry(2,"[ ] Red/Green ", MENU_COLOR_2);
glutChangeToMenuEntry(3,"[ ] Blue/Green", MENU_COLOR_3);
glutChangeToMenuEntry(4,"[ ] Random", MENU_COLOR_4);
switch (value) {
case MENU_COLOR_1:
glutChangeToMenuEntry(1, "[ * ] Various", MENU_COLOR_1); Color = SC1; break;
case MENU_COLOR_2:
glutChangeToMenuEntry(2, "[ * ] Red/Green", MENU_COLOR_2);
Color = SC2; break;
case MENU_COLOR_3:
glutChangeToMenuEntry(3, "[ * ] Blue/Green", MENU_COLOR_3);
Color = SC3; break;
case MENU_COLOR_4:
glutChangeToMenuEntry(4, "[ * ] Random", MENU_COLOR_4);
Color = SC4; break;
}
}

void handlemenu(int value)
{
 switch (value) {
   case MENU_ANTI_OFF:
     glDisable(GL_LINE_SMOOTH);
     glutChangeToMenuEntry(3, "anti-aliasing [NO]", MENU_ANTI_ON);
     break;
   case MENU_ANTI_ON:
     glEnable(GL_LINE_SMOOTH);
     glutChangeToMenuEntry(3, "anti-aliasing [YES]", MENU_ANTI_OFF);
     break;
   case MENU_REDRAW:
     glutPostRedisplay();
     break;
   case MENU_ERASE:
     glDeleteLists(0, DispLists);
     DispLists = 1;
     mydisplay();
     break;
   case MENU_QUIT:
     exit(0);
     break;
   }
}

void myMenuInit(void)

{
 int sub1,sub2,sub3;

sub3 = glutCreateMenu(handlealphamenu);
glutAddMenuEntry("[ ] 0.05", MENU_ALPHA_1); glutAddMenuEntry("[ * ] 0.20", MENU_ALPHA_2);
glutAddMenuEntry("[ ] 0.50", MENU_ALPHA_3);
glutAddMenuEntry("[ ] 1.00", MENU_ALPHA_4);
sub2 = glutCreateMenu(handlecolormenu);
glutAddMenuEntry("[ * ] Various", MENU_COLOR_1); glutAddMenuEntry("[ ] Red/Green", MENU_COLOR_2);
glutAddMenuEntry("[ ] Blue/Green", MENU_COLOR_3);
glutAddMenuEntry("[ ] Random", MENU_COLOR_4);
sub1 = glutCreateMenu(handlemenu);
glutAddSubMenu("Colors", sub2);
glutAddSubMenu("Alpha", sub3);
glutAddMenuEntry("anti-aliasing [NO]", MENU_ANTI_ON);
glutCreateMenu(handlemenu);
glutAddSubMenu("Lines", sub1);
glutAddMenuEntry("Erase", MENU_ERASE);
glutAddMenuEntry("Redraw", MENU_REDRAW);
glutAddMenuEntry("Quit", MENU_QUIT);
glutAttachMenu(GLUT_RIGHT_BUTTON);
}

int main(int argc, char** argv)
{
 glutInit(&argc, argv);
 glutInitWindowSize(512, 512);
 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
 glutCreateWindow("lineblend");

 myglInit();
 myMenuInit();

 glutReshapeFunc(myreshape);
 glutMouseFunc(mousebutton);
 glutMotionFunc(drawline);
 glutDisplayFunc(mydisplay);

 glutMainLoop();
 return 0;             /* ANSI C requires main to return int. */
}

----------------end lineblend.c ----------------

-----------begin compile lineblend.c -------------------

cc -c -g -Wall -DMACOSX -I/usr/include lineblend.c

cc -o lineblend  lineblend.o -framework GLUT -framework OpenGL -lobjc

----------- end compile lineblend.c -----------



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