ALLEGRO_STATE(3)                                              ALLEGRO_STATE(3)

NAME
       ALLEGRO_STATE - Allegro 5 API

SYNOPSIS



              typedef struct ALLEGRO_STATE ALLEGRO_STATE;


DESCRIPTION
       Opaque type which is passed to al_store_state(3)/al_restore_state(3).

       The various state kept internally by Allegro can be displayed like
       this:


                global
                    active system driver
                        current config
                per thread
                    new bitmap params
                    new display params
                    active file interface
                    errno
                    current blending mode
                    current display
                        deferred drawing
                    current target bitmap
                        current transformation
                        current projection transformation
                        current clipping rectangle
                        bitmap locking
                        current shader


       In general, the only real global state is the active system driver.
       All other global state is per-thread, so if your application has
       multiple separate threads they never will interfere with each other.
       (Except if there are objects accessed by multiple threads of course.
       Usually you want to minimize that though and for the remaining cases
       use synchronization primitives described in the threads section or
       events described in the events section to control inter-thread
       communication.)

Allegro reference manual                                      ALLEGRO_STATE(3)