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       al_set_new_display_flags - Allegro 5 API


              #include <allegro5/allegro.h>

              void al_set_new_display_flags(int flags)


       Sets  various flags to be used when creating new displays on the calling thread.  flags is
       a bitfield containing any reasonable combination of the following:

              Prefer a windowed mode.

              Under multi-head X (not XRandR/TwinView), the use  of  more  than  one  adapter  is
              impossible  due to bugs in X and GLX.  al_create_display(3alleg5) will fail if more
              than one adapter is attempted to be used.

              Make the window span the entire screen.  Unlike ALLEGRO_FULLSCREEN this will  never
              attempt  to  modify  the  screen  resolution.   Instead the pixel dimensions of the
              created display will be the same as the desktop.

              The passed width and height are  only  used  if  the  window  is  switched  out  of
              fullscreen mode later but will be ignored initially.

              Under  Windows  and  X11  a  fullscreen  display created with this flag will behave
              differently from one created  with  the  ALLEGRO_FULLSCREEN  flag  -  even  if  the
              ALLEGRO_FULLSCREEN  display is passed the desktop dimensions.  The exact difference
              is platform dependent, but some things which may be different is how alt-tab works,
              how fast you can toggle between fullscreen/windowed mode or how additional monitors
              behave while your display is in fullscreen mode.

              Additionally under X, the use of more than one adapter in multi-head mode  or  with
              true  Xinerama  enabled  is  impossible due to bugs in X/GLX, creation will fail if
              more than one adapter is attempted to be used.

              Prefer a fullscreen mode.

              Under X the use of more than one FULLSCREEN display when  using  multi-head  X,  or
              true  Xinerama is not possible due to bugs in X and GLX, display creation will fail
              if more than one adapter is attempted to be used.

                     Note: Prefer using ALLEGRO_FULLSCREEN_WINDOW  as  it  typically  provides  a
                     better  user  experience  as  the  monitor  doesn't  change  resolution  and
                     switching   away   from   your   game   via    Alt-Tab    works    smoothly.
                     ALLEGRO_FULLSCREEN   is   typically   less   well   supported   compared  to

              The display is resizable (only applicable if combined with ALLEGRO_WINDOWED).

              The  display  window  will  be  maximized  (only  applicable   if   combined   with
              ALLEGRO_RESIZABLE).  Since: 5.1.12

              Require  the  driver  to  provide  an  initialized  OpenGL  context after returning

              Require the driver to provide an initialized OpenGL context compatible with  OpenGL
              version 3.0.

              If  this  flag  is  set, the OpenGL context created with ALLEGRO_OPENGL_3_0 will be
              forward compatible only, meaning that all of the OpenGL API declared deprecated  in
              OpenGL 3.0 will not be supported.  Currently, a display created with this flag will
              not  be  compatible   with   Allegro   drawing   routines;   the   display   option
              ALLEGRO_COMPATIBLE_DISPLAY will be set to false.

              Used together with ALLEGRO_OPENGL, requests that the OpenGL context uses the OpenGL
              ES    profile.     A     specific     version     can     be     requested     with
              al_set_new_display_option(3alleg5).   Note: Currently this is only supported by the
              X11/GLX driver.  Since: 5.1.13

              Require the driver to do rendering with Direct3D and provide a Direct3D device.

              Require  a  programmable  graphics  pipeline.   This  flag  is  required   to   use
              ALLEGRO_SHADER(3alleg5) objects.  Since: 5.1.6

              Try to create a window without a frame (i.e.  no border or titlebar).  This usually
              does nothing for fullscreen modes, and even in windowed modes  it  depends  on  the
              underlying platform whether it is supported or not.  Since: 5.0.7, 5.1.2

              Original name for ALLEGRO_FRAMELESS.  This works with older versions of Allegro.

              Let the display generate expose events.

              Create  a  GTK  toplevel  window for the display, on X.  This flag is conditionally
              defined     by     the     native     dialog     addon.      You     must      call
              al_init_native_dialog_addon(3alleg5)  for  it  to succeed.  ALLEGRO_GTK_TOPLEVEL is
              incompatible with ALLEGRO_FULLSCREEN.  Since: 5.1.5

       0 can be used for default values.


       al_set_new_display_option(3alleg5),                        al_get_display_option(3alleg5),