Method build_map_cache

src/map.cpp:8342–8380

}

void map::build_map_cache( const int zlev, bool skip_lightmap )
{
    const int minz = zlevels ? -OVERMAP_DEPTH : zlev;
    const int maxz = zlevels ? OVERMAP_HEIGHT : zlev;
    bool seen_cache_dirty = false;
    for( int z = minz; z <= maxz; z++ ) {
        // trigger FOV recalculation only when there is a change on the player's level or if fov_3d is enabled
        const bool affects_seen_cache =  z == zlev || fov_3d;
        build_outside_cache( z );
        build_transparency_cache( z );
        bool floor_cache_was_dirty = build_floor_cache( z );
        seen_cache_dirty |= ( floor_cache_was_dirty && affects_seen_cache );
        if( floor_cache_was_dirty && z > -OVERMAP_DEPTH ) {
            get_cache( z - 1 ).r_up_cache->invalidate();
        }
        seen_cache_dirty |= get_cache( z ).seen_cache_dirty && affects_seen_cache;
    }
    // needs a separate pass as it changes the caches on neighbour z-levels (e.g. floor_cache);
    // otherwise such changes might be overwritten by main cache-building logic
    for( int z = minz; z <= maxz; z++ ) {
        do_vehicle_caching( z );
    }

    seen_cache_dirty |= build_vision_transparency_cache( zlev );

    if( seen_cache_dirty ) {
        skew_vision_cache.clear();
    }
    // Initial value is illegal player position.
    const tripoint p = get_player_character().pos();
    static tripoint player_prev_pos;
    if( seen_cache_dirty || player_prev_pos != p ) {
        build_seen_cache( p, zlev );
        player_prev_pos = p;
    }
    if( !skip_lightmap ) {
        generate_lightmap( zlev );
    }
}

//////////
///// coordinate helpers