OSG控制幀率的方法

osg::ref_ptrviewer = new osgviewer::viewer;

osg::ref_ptrnode;

//申請乙個定時器

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;

//控制幀率使用的睡眠時間

float sleep_time = 0.0;

float last_sleep_time = 0.0;

//每幀的實際使用時間

float current_time = 0.0;

//每幀控制法

//float per_start_time = 0.0;

//float per_end_time = 0.0;

//計算幀率

int counts = 0;

//得到乙個tick值為多少second

std::cout << timer->getsecondspertick()<

//start_time = timer->tick();

start_time = viewer->elapsedtime();

timer->setstarttick();

node = osgdb::readnodefile("glider.osg");

std::cout<<"方法一：讀取模型的時間為:"tick();

end_time = viewer->elapsedtime();

std::cout<<"方法二：讀取模型的時間為:"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())

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)

openthreads::thread::microsleep(sleep_time*1000000);

//last_sleep_time = sleep_time;

if(counts == 3)

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