Bug 31046

	An OpenGL program compiled under linux will not run correctly under
	the linuxator

Fix: 

Seems to be fixed in FreeBSD-4.6.2-RELEASE.
How-To-Repeat: 	compile this program under linux and run under FreeBSD.  The program
	gets these errors:

before gluInit
before glutInitDisplayMode
before glutInitWindowPosition
before glutInitWindowSize
before glutCreateWindow
GenuineIntel cpu detected.
Katmai cpu detected.
before init
before glutDisplayFunc
before glutReshapeFunc
before glutKeyboardFunc
before glutSpecialFunc
before glutVisibilityFunc
before glutMainLoop
Illegal instruction (core dumped) 



/* $Id: gears.c,v 1.2 1999/10/21 16:39:06 brianp Exp $ */

/*
 * 3-D gear wheels.  This program is in the public domain.
 *
 * Command line options:
 *    -info      print GL implementation information
 *
 *
 * Brian Paul
 */

/* Conversion to GLUT by Mark J. Kilgard */

/*
 * $Log: gears.c,v $
 * Revision 1.2  1999/10/21 16:39:06  brianp
 * added -info command line option
 *
 * Revision 1.1.1.1  1999/08/19 00:55:40  jtg
 * Imported sources
 *
 * Revision 3.2  1999/06/03 17:07:36  brianp
 * an extra quad was being drawn in front and back faces
 *
 * Revision 3.1  1998/11/03 02:49:10  brianp
 * added fps output
 *
 * Revision 3.0  1998/02/14 18:42:29  brianp
 * initial rev
 *
 */


#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <GL/glut.h>

#ifndef M_PI
#define M_PI 3.14159265
#endif

static GLint T0 = 0;
static GLint Frames = 0;


/**

  Draw a gear wheel.  You'll probably want to call this function when
  building a display list since we do a lot of trig here.
 
  Input:  inner_radius - radius of hole at center
          outer_radius - radius at center of teeth
          width - width of gear
          teeth - number of teeth
          tooth_depth - depth of tooth

 **/

static void
gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
  GLint teeth, GLfloat tooth_depth)
{
  GLint i;
  GLfloat r0, r1, r2;
  GLfloat angle, da;
  GLfloat u, v, len;

  r0 = inner_radius;
  r1 = outer_radius - tooth_depth / 2.0;
  r2 = outer_radius + tooth_depth / 2.0;

  da = 2.0 * M_PI / teeth / 4.0;

  glShadeModel(GL_FLAT);

  glNormal3f(0.0, 0.0, 1.0);

  /* draw front face */
  glBegin(GL_QUAD_STRIP);
  for (i = 0; i <= teeth; i++) {
    angle = i * 2.0 * M_PI / teeth;
    glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
    glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
    if (i < teeth) {
      glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
    }
  }
  glEnd();

  /* draw front sides of teeth */
  glBegin(GL_QUADS);
  da = 2.0 * M_PI / teeth / 4.0;
  for (i = 0; i < teeth; i++) {
    angle = i * 2.0 * M_PI / teeth;

    glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
  }
  glEnd();

  glNormal3f(0.0, 0.0, -1.0);

  /* draw back face */
  glBegin(GL_QUAD_STRIP);
  for (i = 0; i <= teeth; i++) {
    angle = i * 2.0 * M_PI / teeth;
    glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
    glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
    if (i < teeth) {
      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
      glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
    }
  }
  glEnd();

  /* draw back sides of teeth */
  glBegin(GL_QUADS);
  da = 2.0 * M_PI / teeth / 4.0;
  for (i = 0; i < teeth; i++) {
    angle = i * 2.0 * M_PI / teeth;

    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
    glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
  }
  glEnd();

  /* draw outward faces of teeth */
  glBegin(GL_QUAD_STRIP);
  for (i = 0; i < teeth; i++) {
    angle = i * 2.0 * M_PI / teeth;

    glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
    glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
    u = r2 * cos(angle + da) - r1 * cos(angle);
    v = r2 * sin(angle + da) - r1 * sin(angle);
    len = sqrt(u * u + v * v);
    u /= len;
    v /= len;
    glNormal3f(v, -u, 0.0);
    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
    glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
    glNormal3f(cos(angle), sin(angle), 0.0);
    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5);
    glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5);
    u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
    v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
    glNormal3f(v, -u, 0.0);
    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5);
    glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5);
    glNormal3f(cos(angle), sin(angle), 0.0);
  }

  glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
  glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);

  glEnd();

  glShadeModel(GL_SMOOTH);

  /* draw inside radius cylinder */
  glBegin(GL_QUAD_STRIP);
  for (i = 0; i <= teeth; i++) {
    angle = i * 2.0 * M_PI / teeth;
    glNormal3f(-cos(angle), -sin(angle), 0.0);
    glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
    glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
  }
  glEnd();

}

static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
static GLint gear1, gear2, gear3;
static GLfloat angle = 0.0;

static void
draw(void)
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  glPushMatrix();
  glRotatef(view_rotx, 1.0, 0.0, 0.0);
  glRotatef(view_roty, 0.0, 1.0, 0.0);
  glRotatef(view_rotz, 0.0, 0.0, 1.0);

  glPushMatrix();
  glTranslatef(-3.0, -2.0, 0.0);
  glRotatef(angle, 0.0, 0.0, 1.0);
  glCallList(gear1);
  glPopMatrix();

  glPushMatrix();
  glTranslatef(3.1, -2.0, 0.0);
  glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
  glCallList(gear2);
  glPopMatrix();

  glPushMatrix();
  glTranslatef(-3.1, 4.2, 0.0);
  glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
  glCallList(gear3);
  glPopMatrix();

  glPopMatrix();

  glutSwapBuffers();

  Frames++;
  {
     GLint t = glutGet(GLUT_ELAPSED_TIME);
     if (t - T0 >= 5000) {
        GLfloat seconds = (t - T0) / 1000.0;
        GLfloat fps = Frames / seconds;
        printf("%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
        T0 = t;
        Frames = 0;
     }
  }
}


static void
idle(void)
{
  angle += 2.0;
  glutPostRedisplay();
}

/* change view angle, exit upon ESC */
/* ARGSUSED1 */
static void
key(unsigned char k, int x, int y)
{
  switch (k) {
  case 'z':
    view_rotz += 5.0;
    break;
  case 'Z':
    view_rotz -= 5.0;
    break;
  case 27:  /* Escape */
    exit(0);
    break;
  default:
    return;
  }
  glutPostRedisplay();
}

/* change view angle */
/* ARGSUSED1 */
static void
special(int k, int x, int y)
{
  switch (k) {
  case GLUT_KEY_UP:
    view_rotx += 5.0;
    break;
  case GLUT_KEY_DOWN:
    view_rotx -= 5.0;
    break;
  case GLUT_KEY_LEFT:
    view_roty += 5.0;
    break;
  case GLUT_KEY_RIGHT:
    view_roty -= 5.0;
    break;
  default:
    return;
  }
  glutPostRedisplay();
}

/* new window size or exposure */
static void
reshape(int width, int height)
{
  GLfloat h = (GLfloat) height / (GLfloat) width;

  glViewport(0, 0, (GLint) width, (GLint) height);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glTranslatef(0.0, 0.0, -40.0);
}

static void
init(int argc, char *argv[])
{
  static GLfloat pos[4] =
  {5.0, 5.0, 10.0, 0.0};
  static GLfloat red[4] =
  {0.8, 0.1, 0.0, 1.0};
  static GLfloat green[4] =
  {0.0, 0.8, 0.2, 1.0};
  static GLfloat blue[4] =
  {0.2, 0.2, 1.0, 1.0};

  glLightfv(GL_LIGHT0, GL_POSITION, pos);
  glEnable(GL_CULL_FACE);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_DEPTH_TEST);

  /* make the gears */
  gear1 = glGenLists(1);
  glNewList(gear1, GL_COMPILE);
  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
  gear(1.0, 4.0, 1.0, 20, 0.7);
  glEndList();

  gear2 = glGenLists(1);
  glNewList(gear2, GL_COMPILE);
  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
  gear(0.5, 2.0, 2.0, 10, 0.7);
  glEndList();

  gear3 = glGenLists(1);
  glNewList(gear3, GL_COMPILE);
  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
  gear(1.3, 2.0, 0.5, 10, 0.7);
  glEndList();

  glEnable(GL_NORMALIZE);

  if (argc > 1 && strcmp(argv[1], "-info")==0) {
     printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
     printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
     printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
     printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
  }
}

void 
visible(int vis)
{
  if (vis == GLUT_VISIBLE)
    glutIdleFunc(idle);
  else
    glutIdleFunc(NULL);
}

int main(int argc, char *argv[])
{
fprintf (stderr, "before gluInit\n");
  glutInit(&argc, argv);
fprintf (stderr, "before glutInitDisplayMode\n");
  glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
fprintf (stderr, "before glutInitWindowPosition\n");

  glutInitWindowPosition(0, 0);
fprintf (stderr, "before glutInitWindowSize\n");
  glutInitWindowSize(300, 300);
fprintf (stderr, "before glutCreateWindow\n");
  glutCreateWindow("Gears");
fprintf (stderr, "before init\n");
  init(argc, argv);
fprintf (stderr, "before glutDisplayFunc\n");

  glutDisplayFunc(draw);
fprintf (stderr, "before glutReshapeFunc\n");
  glutReshapeFunc(reshape);
fprintf (stderr, "before glutKeyboardFunc\n");
  glutKeyboardFunc(key);
fprintf (stderr, "before glutSpecialFunc\n");
  glutSpecialFunc(special);
fprintf (stderr, "before glutVisibilityFunc\n");
  glutVisibilityFunc(visible);
fprintf (stderr, "before glutMainLoop\n");

  glutMainLoop();
fprintf (stderr, "after glutMainLoop\n");
  return 0;             /* ANSI C requires main to return int. */
}