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.)