ALLEGRO_STATE man page

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.)

Referenced By

al_restore_state(3), al_store_state(3).

Allegro reference manual