No ALLEGRO_EVENT_DISPLAY_RESIZE on fullscreen switch?

no-reply@allegro.cc (roger levy) — Sat, 31 Jan 2015 00:55:15 +0000

In my event handler I respond to ALLEGRO_EVENT_DISPLAY_RESIZE events, but it seems that they don't fire when I call al_toggle_display_flag to toggle fullscreen via ALLEGRO_FULLSCREEN_WINDOW. Seems that that should event should be generated on fs toggle. Is this a bug?

In any case how should I get the current display dimensions on fullscreen toggle?

no-reply@allegro.cc (jmasterx) — Sat, 31 Jan 2015 01:08:26 +0000

The way I do it is:

My Display class does this:

#SelectExpand
bool Display::toggleFullscreen( bool fullscreen )
{
  bool result = al_toggle_display_flag(context,ALLEGRO_FULLSCREEN_WINDOW,fullscreen);
  if(result)
  {
    resizeSceneForFullscreen(getResolution().getX(),getResolution().getY());
    if(fullscreen)
    Log::write("Display","Window is now Fullscreen");
    else
    Log::write("Display","Window is now Windowed");
  }
  //initContext(context);
  return result;
 14
}
 16
void Display::resizeSceneForFullscreen(int w, int h)
{
  if(m_sceneMessenger)
  {
    m_sceneMessenger->sendResizeMessage(w,h);
  }
}
 24
Vec2 Display::getResolution() const
{
  return Vec2(
    (float)al_get_display_width(context),
    (float)al_get_display_height(context));
}

So quite simply, I pump my own resize message in this case to the scene manager.

If you want more detail let me know.

no-reply@allegro.cc (pkrcel) — Sat, 31 Jan 2015 02:40:30 +0000

But that makes sense, I woudl expect a display resize regardless on an actual change of resolution if toggling between window and fullscreen mode.

Is this not fired by design?

no-reply@allegro.cc (William Labbett) — Sat, 31 Jan 2015 04:21:02 +0000

Fullscreen as oppose to windowed mode is a tricky business. My project went on hold for a year due to needing to handle it all properly.

no-reply@allegro.cc (Gideon Weems) — Sat, 31 Jan 2015 06:54:54 +0000

Bah, it's not tricky. See the FAQ.

Quote:

How do I switch between full-screen and windowed modes?

For full-screen, use ALLEGRO_FULLSCREEN_WINDOWED and scale the buffer with a transformation.[5] For windowed, use ALLEGRO_WINDOWED.