# State ## ALLEGRO_STATE
    typedef struct ALLEGRO_STATE
Opaque type which is passed to al_store_state/al_restore_state. ## ALLEGRO_STATE_FLAGS
    enum ALLEGRO_STATE_FLAGS {
Flags which can be passed to al_store_state/al_restore_state as bit combinations. The following flags store or restore settings corresponding to the following al_set_/al_get_ calls: ALLEGRO_STATE_NEW_DISPLAY_PARAMETERS - new_display_format, new_display_refresh_rate, new_display_flags ALLEGRO_STATE_NEW_BITMAP_PARAMETERS - new_bitmap_format, new_bitmap_flags ALLEGRO_STATE_DISPLAY - current_display ALLEGRO_STATE_TARGET_BITMAP - target_bitmap ALLEGRO_STATE_BLENDER - blender ALLEGRO_STATE_NEW_FILE_INTERFACE - new_file_interface ALLEGRO_STATE_BITMAP - same as ALLEGRO_STATE_NEW_BITMAP_PARAMETERS and ALLEGRO_STATE_TARGET_BITMAP ALLEGRO_STATE_ALL - all of the above ## al_get_errno
    int al_get_errno(void)
Some Allegro functions will set an error number as well as returning an error code. Call this function to retrieve the last error number set for the calling thread. ## al_set_errno
    void al_set_errno(int errnum)
Set the error number for for the calling thread. ## al_restore_state
    void al_restore_state(ALLEGRO_STATE const *state)
Restores part of the state of the current thread from the given `ALLEGRO_STATE` object. ## al_store_state
    void al_store_state(ALLEGRO_STATE *state, int flags)
Stores part of the state of the current thread in the given ALLEGRO_STATE objects. The flags parameter can take any bit-combination of the flags described under ALLEGRO_STATE_FLAGS.

Last updated: 2009-05-04 10:18:47 UTC