OSG控制帧率的方法
来源:互联网 发布:网络信息安全 期刊 编辑:程序博客网 时间:2024/06/05 20:59
osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
osg::ref_ptr<osg::Node> node;
//申请一个定时器
osg::Timer* timer = new osg::Timer;
osg::Timer_t start_frame_time = 0;
osg::Timer_t end_frame_time = 0;
float start_time;
float end_time;
//控制帧率使用的睡眠时间
float sleep_time = 0.0;
float last_sleep_time = 0.0;
//每帧的实际使用时间
float current_time = 0.0;
//每帧控制法
//float per_start_time = 0.0;
//float per_end_time = 0.0;
//计算帧率
int counts = 0;
//得到一个tick值为多少second
std::cout << timer->getSecondsPerTick()<<std::endl;
//start_time = timer->tick();
start_time = viewer->elapsedTime();
timer->setStartTick();
node = osgDB::readNodeFile("glider.osg");
std::cout<<"方法一:读取模型的时间为:"<<timer->time_s()<<std::endl;
//end_time = timer->tick();
end_time = viewer->elapsedTime();
std::cout<<"方法二:读取模型的时间为:"<<end_time - start_time<<std::endl;
//添加帮助事件
viewer->addEventHandler(new PrintName);
viewer->addEventHandler(new osgViewer::HelpHandler);
viewer->addEventHandler(new osgViewer::StatsHandler);
viewer->addEventHandler(new osgViewer::WindowSizeHandler);
viewer->addEventHandler(new osgViewer::ScreenCaptureHandler);
viewer->setSceneData(node);
viewer->setCameraManipulator(new osgGA::TrackballManipulator());
while(!viewer->done())
{
//per_start_time = timer->tick();
if(counts == 0)
{
start_frame_time = timer->tick();
}
counts++;
viewer->frame();
//per_end_time = timer->tick();
//sleep_time = 1/35.0 - timer->delta_s(per_start_time, per_end_time);
if(sleep_time < 0)
{
sleep_time = 0.0;
}
OpenThreads::Thread::microSleep(sleep_time*1000000);
//last_sleep_time = sleep_time;
if(counts == 3)
{
//限制帧率为35
counts = 0;
end_frame_time = timer->tick();
std::cout<<"当前帧速为: " << 3/timer->delta_s(start_frame_time, end_frame_time)<<std::endl;
sleep_time = sleep_time + 1.0/35.0 - timer->delta_s(start_frame_time, end_frame_time)/3;
if(sleep_time < 0)
sleep_time = 0;
}
转载地址:http://blog.sina.com.cn/s/blog_48ed03c801018blt.html
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