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ALLEGRO_STATE(3alleg5) Allegro reference manual

NAME

ALLEGRO_STATE − Allegro 5 API

SYNOPSIS

typedef struct ALLEGRO_STATE ALLEGRO_STATE;

DESCRIPTION

Opaque type which is passed to al_store_state(3alleg5)/al_restore_state(3alleg5).

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.)

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