Hi,

I'm following the tutorial here: I was not able to insert a link so search google for "OpenGL Tutorial for 308-557"
Everything worked fine until number 6: Rotate cube. It compiles ok, but only displays a red face and doesn't respond to user inputs.
Here's the code:
Code :
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
 
#define WIDTH 480
#define HEIGHT 480
 
#define RED   0
#define GREEN 0
#define BLUE  0
#define ALPHA 1
 
#define KEY_ESC 27
#define KEY_UP 101
#define KEY_DOWN 103
#define KEY_X 120
#define KEY_Y 121
#define KEY_Z 122
 
#define DELTA 5
int x = 0;
int rotateX = 0;
int y = 0;
int rotateY = 0;
int z = 0;
int rotateZ = 0;
int speed = 0;
 
int squares = 0;
GLuint face;
GLuint cube;
 
GLvoid initGL();
void init_scene();
GLvoid window_reshape(GLsizei width, GLsizei height);
GLvoid window_display();
void render_scene();
GLvoid window_key(unsigned char key, int x, int y);
GLvoid window_special_key(int key, int x, int y);
GLvoid window_idle();
 
int main(int argc, char **argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
	glutInitWindowSize(WIDTH, HEIGHT);
	glutInitWindowPosition(0, 0);
	glutCreateWindow("Square");
 
	initGL();
	init_scene();
 
	glutIdleFunc(&window_idle);
	glutSpecialFunc(&window_special_key);
 
	glutDisplayFunc(&window_display);
	glutReshapeFunc(&window_reshape);
	glutKeyboardFunc(&window_key);
	glutMainLoop();
 
	return 1;
}
 
/**
* 
*/
GLvoid initGL()
{	
	glClearColor(RED, GREEN, BLUE, ALPHA);
	glClearDepth(1.0);
	glDepthFunc(GL_LESS);
	glEnable(GL_DEPTH_TEST);
}
 
void init_scene()
{
	face = glGenLists(2);
	cube = face + 1;
 
	glNewList(face, GL_COMPILE);
	glBegin(GL_POLYGON);
	glVertex3f(0, 0, 0);
	glVertex3f(1, 0, 0);
	glVertex3f(1, 1, 0);
	glVertex3f(0, 1, 0);
	glEnd();
	glEndList();
 
	glNewList(cube, GL_COMPILE);
	glTranslatef(-0.5, -0.5, 0.5);
	glColor3f(1, 0, 0);
	glCallList(face);
 
	glColor3f(1, 1, 0);
	glPushMatrix();
	glTranslatef(0, 0, -1);
	glCallList(face);
	glPopMatrix();
 
	glColor3f(0, 1, 0);
	glPushMatrix();
	glRotatef(90, 0, 1, 0);
	glCallList(face);
	glPopMatrix();
 
	glColor3f(0, 1, 1);
	glPushMatrix();
	glTranslatef(1, 0, 0);
	glRotatef(90, 0, 1, 0);
	glCallList(face);
	glPopMatrix();
 
	glColor3f(0, 0, 1);
	glPushMatrix();
	glRotatef(-90, 1, 0, 0);
	glCallList(face);
	glPopMatrix();
 
	glColor3f(1, 0, 1);
	glPushMatrix();
	glTranslatef(0, 1, 0);
	glRotatef(-90, 1, 0, 0);
	glCallList(face);
	glPopMatrix();
 
	glEndList();
}
 
/**
* GLUT will call this function every time the window is resized.
*/
GLvoid window_reshape(GLsizei width, GLsizei height)
{
	glViewport(0, 0, width, height);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45, (GLdouble)width/(GLdouble)height, 1, 10);
	glMatrixMode(GL_MODELVIEW);
}
 
GLvoid window_display()
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();
	gluLookAt(0, 0, 5, 0, 0, 0, 0, 1, 0);
	render_scene();
 
	//glFlush();
	glutSwapBuffers();
}
 
void render_scene()
{
	glRotatef(x, 1, 0, 0);
	glRotatef(y, 0, 1, 0);
	glRotatef(z, 0, 0, 1);
	glCallList(cube);
}
 
GLvoid window_key(unsigned char key, int x, int y)
{
	switch(key) {
		case KEY_ESC:
			exit(1);
			break;
		case KEY_X:
			rotateX = !rotateX;
			glutPostRedisplay();
			break;
		case KEY_Y:
			rotateY = !rotateY;
			glutPostRedisplay();
			break;
		case KEY_Z:
			rotateZ = !rotateZ;
			glutPostRedisplay();
			break;
		default:
			printf("Pressing %d doesn't do anything.\n", key);
			break;
	}
}
 
GLvoid window_special_key(int key, int x, int y)
{
	switch(key) {
		case KEY_UP:
			speed = (speed + DELTA + 360) % 360;
			glutPostRedisplay();
			break;
		case KEY_DOWN:
			speed = (speed - DELTA + 360) % 360;
			glutPostRedisplay();
			break;
		default:
			printf("Pressing %d doesn't do anything.\n", key);
			break;
	}
}
 
GLvoid window_idle()
{
	if(rotateX) x = (x + speed + 360) % 360;
	if(rotateY) y = (y + speed + 360) % 360;
	if(rotateZ) z = (z + speed + 360) % 360;
	if(speed > 0 && (rotateX || rotateY || rotateZ))
		glutPostRedisplay();
}

I'm using Ubuntu 11.10