FGFS-4.1/OpenSceneGraph
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Added support for different threading models in osgViewer::Viewer

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This commit is contained in:
Robert Osfield 2007-01-02 17:39:31 +00:00
parent b315ed4d58
commit f14aa7ef66
4 changed files with 180 additions and 71 deletions
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145
examples/osgcamera/osgcamera.cpp
View File

@ -7,42 +7,16 @@
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osgGA/TrackballManipulator>
#include <osgGA/AnimationPathManipulator>
#include <iostream>
int main( int argc, char **argv )
void singleWindowMultipleCameras(osgViewer::Viewer& viewer)
{
if (argc<2)
{
std::cout << argv[0] <<": requires filename argument." << std::endl;
return 1;
}
osg::DisplaySettings::instance()->setMaxNumberOfGraphicsContexts(2);
osg::Referenced::setThreadSafeReferenceCounting(true);
// load the scene.
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFile(argv[1]);
if (!loadedModel)
{
std::cout << argv[0] <<": No data loaded." << std::endl;
return 1;
}
osgViewer::Viewer viewer;
viewer.setSceneData(loadedModel.get());
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
viewer.getCamera()->setClearColor(osg::Vec4f(0.6f,0.6f,0.8f,1.0f));
#if 0
osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
if (!wsi)
{
osg::notify(osg::NOTICE)<<"View::setUpViewAcrossAllScreens() : Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
return 0;
return;
}
unsigned int width, height;
@ -91,6 +65,119 @@ int main( int argc, char **argv )
viewer.setUpRenderingSupport();
viewer.assignSceneDataToCameras();
}
void multipleWindowMultipleCameras(osgViewer::Viewer& viewer)
{
osg::GraphicsContext::WindowingSystemInterface* wsi = osg::GraphicsContext::getWindowingSystemInterface();
if (!wsi)
{
osg::notify(osg::NOTICE)<<"View::setUpViewAcrossAllScreens() : Error, no WindowSystemInterface available, cannot create windows."<<std::endl;
return;
}
unsigned int width, height;
wsi->getScreenResolution(osg::GraphicsContext::ScreenIdentifier(0), width, height);
unsigned int numCameras = 2;
double aspectRatioScale = (double)numCameras;
double translate_x = double(numCameras)-1;
for(unsigned int i=0; i<numCameras;++i, translate_x -= 2.0)
{
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = (i*width)/numCameras;
traits->y = 0;
traits->width = width/numCameras-1;
traits->height = height;
#if 1
traits->windowDecoration = false;
#else
traits->windowDecoration = true;
#endif
traits->doubleBuffer = true;
traits->sharedContext = 0;
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
osgViewer::GraphicsWindow* gw = dynamic_cast<osgViewer::GraphicsWindow*>(gc.get());
if (gw)
{
osg::notify(osg::NOTICE)<<" GraphicsWindow has been created successfully."<<gw<<std::endl;
gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(0, 0, traits->width, traits->height );
}
else
{
osg::notify(osg::NOTICE)<<" GraphicsWindow has not been created successfully."<<std::endl;
}
osg::ref_ptr<osg::Camera> camera = new osg::Camera;
camera->setGraphicsContext(gc.get());
camera->setViewport(new osg::Viewport(0,0, width/numCameras, height));
GLenum buffer = traits->doubleBuffer ? GL_BACK : GL_FRONT;
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
viewer.addSlave(camera.get(), osg::Matrix::scale(aspectRatioScale, 1.0, 1.0)*osg::Matrix::translate(translate_x, 0.0, 0.0), osg::Matrix() );
}
viewer.setUpRenderingSupport();
viewer.assignSceneDataToCameras();
}
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
if (argc<2)
{
std::cout << argv[0] <<": requires filename argument." << std::endl;
return 1;
}
std::string pathfile;
osg::ref_ptr<osgGA::AnimationPathManipulator> apm = 0;
while (arguments.read("-p",pathfile))
{
apm = new osgGA::AnimationPathManipulator(pathfile);
if(!apm.valid() || !(apm->valid()) )
{
apm = 0;
}
}
osg::DisplaySettings::instance()->setMaxNumberOfGraphicsContexts(2);
osg::Referenced::setThreadSafeReferenceCounting(true);
// load the scene.
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
if (!loadedModel)
{
std::cout << argv[0] <<": No data loaded." << std::endl;
return 1;
}
osgViewer::Viewer viewer;
while (arguments.read("-s")) { viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded); }
while (arguments.read("-g")) { viewer.setThreadingModel(osgViewer::Viewer::ThreadPerContext); }
while (arguments.read("-c")) { viewer.setThreadingModel(osgViewer::Viewer::ThreadPerCamera); }
viewer.setSceneData(loadedModel.get());
if (apm.valid()) viewer.setCameraManipulator(apm.get());
else viewer.setCameraManipulator( new osgGA::TrackballManipulator() );
viewer.getCamera()->setClearColor(osg::Vec4f(0.6f,0.6f,0.8f,1.0f));
#if 1
// singleWindowMultipleCameras(viewer);
multipleWindowMultipleCameras(viewer);
#else

15
include/osgViewer/Viewer
View File

@ -36,6 +36,19 @@ class OSGVIEWER_EXPORT Viewer : public osgViewer::View
bool done() { return _done; }
enum ThreadingModel
{
SingleThreaded,
ThreadPerContext,
ThreadPerCamera
};
/** Set the threading model the rendering traversals will use.*/
void setThreadingModel(ThreadingModel threadingModel);
/** Get the threading model the rendering traversals will use.*/
ThreadingModel getThreadingModel() const { return _threadingModel; }
/** Render a complete new frame.
* Calls frameAdvance(), frameEventTraversal(), frameUpateTraversal(), frameRenderingTraversals(). */
virtual void frame();
@ -71,6 +84,8 @@ class OSGVIEWER_EXPORT Viewer : public osgViewer::View
bool _firstFrame;
bool _done;
ThreadingModel _threadingModel;
osg::ref_ptr<osg::BarrierOperation> _startRenderingBarrier;
osg::ref_ptr<osg::BarrierOperation> _endRenderingDispatchBarrier;

4
src/osgViewer/View.cpp
View File

@ -147,7 +147,7 @@ void View::setUpViewAcrossAllScreens()
{
osg::notify(osg::INFO)<<" GraphicsWindow has been created successfully."<<gw<<std::endl;
gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(0, 0, width, height );
gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(traits->x, traits->y, traits->width, traits->height );
}
else
{
@ -193,7 +193,7 @@ void View::setUpViewAcrossAllScreens()
{
osg::notify(osg::INFO)<<" GraphicsWindow has been created successfully."<<gw<<std::endl;
gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(0, 0, width, height );
gw->getEventQueue()->getCurrentEventState()->setWindowRectangle(traits->x, traits->y, traits->width, traits->height );
}
else
{

59
src/osgViewer/Viewer.cpp
View File

@ -24,7 +24,8 @@ using namespace osgViewer;
Viewer::Viewer():
_firstFrame(true),
_done(false)
_done(false),
_threadingModel(ThreadPerContext)
{
}
@ -51,6 +52,11 @@ Viewer::~Viewer()
#endif
}
void Viewer::setThreadingModel(ThreadingModel threadingModel)
{
_threadingModel = threadingModel;
}
void Viewer::init()
{
osg::notify(osg::INFO)<<"Viewer::init()"<<std::endl;
@ -187,15 +193,23 @@ void Viewer::realize()
Contexts contexts;
getContexts(contexts);
bool multiThreaded = contexts.size() > 1;
bool multiThreaded = contexts.size() > 1 && _threadingModel>=ThreadPerContext;
if (multiThreaded)
{
_startRenderingBarrier = new osg::BarrierOperation(contexts.size()+1, osg::BarrierOperation::NO_OPERATION);
_endRenderingDispatchBarrier = new osg::BarrierOperation(contexts.size()+1, osg::BarrierOperation::NO_OPERATION);
bool firstContextAsMainThread = _threadingModel==ThreadPerContext;
unsigned int numThreadsIncludingMainThread = firstContextAsMainThread ? contexts.size() : contexts.size()+1;
osg::notify(osg::NOTICE)<<"numThreadsIncludingMainThread=="<<numThreadsIncludingMainThread<<std::endl;
_startRenderingBarrier = new osg::BarrierOperation(numThreadsIncludingMainThread, osg::BarrierOperation::NO_OPERATION);
_endRenderingDispatchBarrier = new osg::BarrierOperation(numThreadsIncludingMainThread, osg::BarrierOperation::NO_OPERATION);
osg::ref_ptr<osg::SwapBuffersOperation> swapOp = new osg::SwapBuffersOperation();
for(citr = contexts.begin();
citr = contexts.begin();
if (firstContextAsMainThread) ++citr;
for(;
citr != contexts.end();
++citr)
{
@ -255,7 +269,7 @@ void Viewer::realize()
++citr)
{
osg::GraphicsContext* gc = (*citr);
if (!gc->getGraphicsThread()->isRunning())
if (gc->getGraphicsThread() && !gc->getGraphicsThread()->isRunning())
{
gc->getGraphicsThread()->startThread();
OpenThreads::Thread::YieldCurrentThread();
@ -569,49 +583,42 @@ void Viewer::frameRenderingTraversals()
dp->signalBeginFrame(_scene->getFrameStamp());
}
bool multiThreaded = _startRenderingBarrier.valid();
if (multiThreaded)
{
// sleep(1);
// osg::notify(osg::NOTICE)<<std::endl<<"Joing _startRenderingBarrier block"<<std::endl;
// dispatch the the rendering threads
_startRenderingBarrier->block();
// osg::notify(osg::NOTICE)<<"Joing _endRenderingDispatchBarrier block"<<std::endl;
// wait till the rendering dispatch is done.
_endRenderingDispatchBarrier->block();
// osg::notify(osg::NOTICE)<<"Leaving _endRenderingDispatchBarrier block"<<std::endl<<std::endl;
}
else
{
Contexts contexts;
getContexts(contexts);
// dispatch the the rendering threads
if (_startRenderingBarrier.valid()) _startRenderingBarrier->block();
Contexts::iterator itr;
for(itr = contexts.begin();
itr != contexts.end();
++itr)
{
if (_done) return;
if (!((*itr)->getGraphicsThread()))
{
(*itr)->makeCurrent();
(*itr)->runOperations();
}
}
// osg::notify(osg::NOTICE)<<"Joing _endRenderingDispatchBarrier block"<<std::endl;
// wait till the rendering dispatch is done.
if (_endRenderingDispatchBarrier.valid()) _endRenderingDispatchBarrier->block();
for(itr = contexts.begin();
itr != contexts.end();
++itr)
{
if (_done) return;
if (!((*itr)->getGraphicsThread()))
{
(*itr)->makeCurrent();
(*itr)->swapBuffers();
}
}
if (dp)