#include <gl/gl.h>
#include <gl/glut.h>
#include <stdio.h>


float alpha, beta, theta;
int x0, y0;
void display(void) {
    glClear(GL_COLOR_BUFFER_BIT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(20.0f, 1.0f, 1.0f, 10.0f);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(0.0f, 0.0f, 5.0f,
    0.0f, 0.0f, 0.0f,
    0.0f, 1.0f, 0.0f);
    glRotatef(alpha, 1.0f, 0.0f, 0.0f);
    glRotatef(beta, 0.0f, 1.0f, 0.0f);
    glRotatef(theta, 0.0f, 0.0f, 1.0f);
    glutWireCube(0.5);
    glFlush();
    glutSwapBuffers();
}

void update() {
    theta = theta + 1;
    glutPostRedisplay();
}

void onMouse(int button, int state, int x, int y) {
    if ( (button == GLUT_LEFT_BUTTON) & (state == GLUT_DOWN) ) {
        x0 = x; y0 = y;
    }
}
void onMotion(int x, int y) {
    alpha = (alpha + (y - y0));
    beta = (beta + (x - x0));
    x0 = x; y0 = y;
    glutPostRedisplay();
}
int main(void) {
    theta = 0;
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(400, 400);
    glutInitWindowPosition(100, 100);
    glutCreateWindow("Ejemplo de menus");
    glutDisplayFunc(display);
    glutIdleFunc(update);
    glutMouseFunc(onMouse);
    glutMotionFunc(onMotion);
    glutMainLoop();
    return 1;
}