bool keys[256];
int UP_KEY = 128;
int LEFT_KEY = 129;
int RIGHT_KEY = 130;

void keyboardDown(unsigned char key, int x, int y)
{
    keys[(int)key] = false;
}
void keyboardUp(unsigned char key, int x, int y)
{
    keys[(int)key] = false;
}

void specialKeyboardDown(int key, int x, int y)
{
    switch (key)
    {
        case GLUT_KEY_LEFT:
            keys[LEFT_KEY] = true;
            break;
        case GLUT_KEY_RIGHT:
            keys[RIGHT_KEY] = true;
            break;
        case GLUT_KEY_UP:
            keys[UP_KEY] = true;
            break;
    }
}

void specialKeyboardUp(int key, int x, int y)
{
    switch (key)
    {
        case GLUT_KEY_LEFT:
            keys[LEFT_KEY] = false;
            break;
        case GLUT_KEY_RIGHT:
            keys[RIGHT_KEY] = false;
            break;
        case GLUT_KEY_UP:
            keys[UP_KEY] = false;
            break;
    }
}

void processKeys()
{
    if(keys[LEFT_KEY])
        cout << LEFT_KEY << endl;
    if(keys[RIGHT_KEY])
        cout << RIGHT_KEY << endl;
    if(keys[UP_KEY])
        cout << UP_KEY << endl;
    if(keys[32])
        cout << 32 << endl;
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutSpecialFunc(specialKeyboardDown);
    glutKeyboardFunc(keyboard);
    glutSpecialUpFunc(specialKeyboardUp);
    glutKeyboardUpFunc(keyboardUp);

    glutMainLoop();
}