Окно X11 не обновляется / не отрисовывается автоматически

Я использую x11 (в Slackware Linux) в качестве окна для рисования с OpenGL.

Все работает, но как-то мое окно x11 не обновляется / не рисует автоматически.

Это только обновляет / рисует, если я изменяю размер окна.

Код окна x11:

int main()
{

/***************  VARIABLE DEFINITION SECTION  ***************/

Display *dpy;
Window root;
GLint att[] = {GLX_RGBA,GLX_DEPTH_SIZE,24,GLX_DOUBLEBUFFER,None};
XVisualInfo *vi;
Colormap cmap;
XSetWindowAttributes swa;
Window win;
GLXContext glc;
XWindowAttributes gwa;
XEvent xev;

enum GAMEOBJECTS {USER, ENEMY};                     //Object Enum - to identify the objects, object must be added in same enumeration you've created the objects

Renderer *renderer = new Renderer();                //Renderer Object/***************  LINUX WINDOW SETTINGS  ***************/dpy = XOpenDisplay(NULL);
if(dpy == NULL)
{
cout << "\ncan't connect to x server\n" << endl;
exit(0);
}

root = DefaultRootWindow(dpy);
vi = glXChooseVisual(dpy,0,att);if(vi == NULL)
{
cout << "\n no appropriate visual found \n" << endl;
exit(0);
}
else
{
cout << "visual " << (void *)vi->visualid << "selected";
}cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);
swa.colormap = cmap;
swa.event_mask = ExposureMask | KeyPressMask;

win = XCreateWindow(dpy,root,0,0,800,600,0,vi->depth,InputOutput,vi->visual,CWColormap | CWEventMask, &swa);XMapWindow(dpy,win);

XStoreName(dpy,win,"VERY SIMPLE APP");

glc = glXCreateContext(dpy,vi,NULL,GL_TRUE);
glXMakeCurrent(dpy,win,glc);

cout << "ENUM: " << USER << endl;
cout << "ENUM: " << ENEMY << endl;

/***************  START RENDERER AND ADD OBJECTS ***************/

renderer->initGL();

renderer->addObject(100,100);   // USER
renderer->move(USER,0,-100);    //move to startposition of USER

renderer->addObject(100,100);   // ENEMY
renderer->move(ENEMY,0,100);    //move to startposition of ENEMY

glEnable(GL_DEPTH_TEST);/***************  GAME LOOP += GAME LOOP NEEDS A OWN GAME LOOP ***************/
int count = 0;
while(1)
{
XNextEvent(dpy,&xev);
//glViewport(0,0,gwa.width,gwa.height);
//renderer->drawGL();

renderer->move(ENEMY,count,100);
if(xev.type == Expose)
{
XGetWindowAttributes(dpy,win,&gwa);
glViewport(0,0,gwa.width,gwa.height);
renderer->drawGL();     // DRAW OPENGL
glXSwapBuffers(dpy,win);
}

else if(xev.type == KeyPress)
{
switch(XLookupKeysym(&xev.xkey,0))
{
case XK_Left:   cout << "LEFT KEY PRESSED" << endl;
renderer->move(USER,-1.0f,0.0f); //Move USER to the right
xev.xkey.send_event;
break;

case XK_Right:  cout << "RIGHT KEY PRESSED" << endl;
renderer->move(USER,1.0f,0.0f); //Move USER to the right
break;

case XK_Escape: glXMakeCurrent(dpy,None,NULL);
glXDestroyContext(dpy,glc);
XDestroyWindow(dpy,win);
XCloseDisplay(dpy);
exit(0);
break;

case XK_P: cout << "P KEY PRESSEED" << endl;
break;

case ConfigureNotify:   renderer->resizeGL(xev.xconfigure.width,xev.xconfigure.height);
break;
}

}
renderer->drawGL();   //DRAW OPENGL
glXSwapBuffers(dpy,win);
count++;
}

return 0;
}

Кто-нибудь может помочь?