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No ALLEGRO_EVENT_DISPLAY_RESIZE on fullscreen switch?
roger levy
Member #2,513
July 2002

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?

Member #11,410
October 2009

The way I do it is:

My Display class does this:

1 bool Display::toggleFullscreen( bool fullscreen ) 2 { 3 bool result = al_toggle_display_flag(context,ALLEGRO_FULLSCREEN_WINDOW,fullscreen); 4 if(result) 5 { 6 resizeSceneForFullscreen(getResolution().getX(),getResolution().getY()); 7 if(fullscreen) 8 Log::write("Display","Window is now Fullscreen"); 9 else 10 Log::write("Display","Window is now Windowed"); 11 } 12 //initContext(context); 13 return result; 14 15 } 16 17 void Display::resizeSceneForFullscreen(int w, int h) 18 { 19 if(m_sceneMessenger) 20 { 21 m_sceneMessenger->sendResizeMessage(w,h); 22 } 23 } 24 25 Vec2 Display::getResolution() const 26 { 27 return Vec2( 28 (float)al_get_display_width(context), 29 (float)al_get_display_height(context)); 30 }

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

If you want more detail let me know.

Member #14,001
February 2012

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?

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William Labbett
Member #4,486
March 2004

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.

Gideon Weems
Member #3,925
October 2003

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


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.

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