osgEarth的Rex引擎原理分析（十五）分页瓦片加载器在更新遍历时对请求处理过程

目标：（十四）中的34

osgEarthDrivers/engine_rex/Loader.cpp
void
PagerLoader::traverse(osg::NodeVisitor& nv)
{
            for(count=0; count < _mergesPerFrame && !_mergeQueue.empty(); ++count)
            {
                Request* req = _mergeQueue.begin()->get();
                if ( req && req->_lastTick >= _checkpoint )
                {
                    OE_START_TIMER(req_apply);
                    req->apply( getFrameStamp() );
                    double s = OE_STOP_TIMER(req_apply);

                    req->setState(Request::FINISHED);
                }

                _mergeQueue.erase( _mergeQueue.begin() );
            }   

            for(Requests::iterator i = _requests.begin(); i != _requests.end(); )
            {} 
}

这里的请求本质上是osgEarth::Drivers::RexTerrainEngine::LoadTileData

osgEarthDrivers/engine_rex/LoadTileData
names