FGFS-4.1/OpenSceneGraph
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Checked in support for cleaning up and then restart a new graphics windows

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once the first one has been closed down.
This commit is contained in:
Robert Osfield
2004-09-30 13:36:00 +00:00
parent 08d4fdefb0
commit 562ceb456f
1 changed files with 112 additions and 72 deletions
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184
examples/osgsimplepager/osgsimplepager.cpp
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@@ -122,12 +122,15 @@ int main( int argc, char **argv )
return 1;
}
// create the window to draw to.
osg::ref_ptr<Producer::RenderSurface> renderSurface = new Producer::RenderSurface;
renderSurface->setWindowName("osgsimplepager");
renderSurface->setWindowRectangle(100,100,800,600);
renderSurface->useBorder(true);
renderSurface->realize();
// When numTimesToRun>1 allow the user to test opening and closing graphics contexts whilst
// still keep scene graph around.
unsigned int numTimesToRun = 1;
if (argc>2)
{
numTimesToRun = atoi(argv[2]);
}
// create the view of the scene.
@@ -145,86 +148,123 @@ int main( int argc, char **argv )
databasePager->setUseFrameBlock(false);
// set whether to pre compile GL objects before merging new subgraphs with main scene graph
databasePager->setCompileGLObjectsForContextID(sceneView->getState()->getContextID(),true);
// databasePager->setCompileGLObjectsForContextID(sceneView->getState()->getContextID(),true);
// register any PagedLOD that need to be tracked in the scene graph
databasePager->registerPagedLODs(sceneView->getSceneData());
// need to register the DatabasePager with the SceneView's CullVisitor so it can pass on request
// for files to be loaded.
sceneView->getCullVisitor()->setDatabaseRequestHandler(databasePager);
// set up a KeyboardMouse to manage the events comming in from the RenderSurface
osg::ref_ptr<Producer::KeyboardMouse> kbm = new Producer::KeyboardMouse(renderSurface.get());
// create a KeyboardMouseCallback to handle the mouse events within this applications
osg::ref_ptr<MyKeyboardMouseCallback> kbmcb = new MyKeyboardMouseCallback(sceneView.get());
sceneView->getCullVisitor()->setDatabaseRequestHandler(databasePager);
// record the timer tick at the start of rendering.
osg::Timer_t start_tick = osg::Timer::instance()->tick();
// set the frame number count. Note, this is outside the window loop, so that
// frame numbers increment even a graphics context is closed down and another opened
// this is to ensure the record of the frame numbers in the scene graph are kept valid.
unsigned int frameNum = 0;
// main loop (note, window toolkits which take control over the main loop will require a window redraw callback containing the code below.)
while( renderSurface->isRealized() && !kbmcb->done())
if (numTimesToRun>1)
{
// set up the frame stamp for current frame to record the current time and frame number so that animtion code can advance correctly
osg::FrameStamp* frameStamp = new osg::FrameStamp;
frameStamp->setReferenceTime(osg::Timer::instance()->delta_s(start_tick,osg::Timer::instance()->tick()));
frameStamp->setFrameNumber(frameNum++);
// pass frame stamp to the SceneView so that the update, cull and draw traversals all use the same FrameStamp
sceneView->setFrameStamp(frameStamp);
// pass any keyboard mouse events onto the local keyboard mouse callback.
kbm->update( *kbmcb );
// set the view
sceneView->setViewMatrix(kbmcb->getViewMatrix());
// update the viewport dimensions, incase the window has been resized.
sceneView->setViewport(0,0,renderSurface->getWindowWidth(),renderSurface->getWindowHeight());
// tell the DatabasePager the frame number of that the scene graph is being actively used to render a frame
databasePager->signalBeginFrame(frameStamp);
// syncronize changes required by the DatabasePager thread to the scene graph
databasePager->updateSceneGraph(frameStamp->getReferenceTime());
// do the update traversal the scene graph - such as updating animations
sceneView->update();
// do the cull traversal, collect all objects in the view frustum into a sorted set of rendering bins
sceneView->cull();
// draw the rendering bins.
sceneView->draw();
// tell the DatabasePager that the frame is complete and that scene graph is no longer be activity traversed.
databasePager->signalEndFrame();
// Swap Buffers
renderSurface->swapBuffers();
// clean up and compile gl objects with a specified limit
double availableTime = 0.0025; // 2.5 ms
// compile any GL objects that are required.
databasePager->compileGLObjects(*(sceneView->getState()),availableTime);
// flush deleted GL objects.
sceneView->flushDeletedGLObjects(availableTime);
// make sure the database pager doesn't unref images as otherwise they won't be around the next time
// they are needed when the a new graphics context comes up.
databasePager->setUnrefImageDataAfterApplyPolicy(true,false);
}
// switch off the database pager by unreferning it.
for(unsigned int i=0;i<numTimesToRun;++i)
{
// create the window to draw to.
osg::ref_ptr<Producer::RenderSurface> renderSurface = new Producer::RenderSurface;
renderSurface->setWindowName("osgsimplepager");
renderSurface->setWindowRectangle(100,100,800,600);
renderSurface->useBorder(true);
renderSurface->realize();
// set up a KeyboardMouse to manage the events comming in from the RenderSurface
osg::ref_ptr<Producer::KeyboardMouse> kbm = new Producer::KeyboardMouse(renderSurface.get());
// create a KeyboardMouseCallback to handle the mouse events within this applications
osg::ref_ptr<MyKeyboardMouseCallback> kbmcb = new MyKeyboardMouseCallback(sceneView.get());
// main loop (note, window toolkits which take control over the main loop will require a window redraw callback containing the code below.)
while( renderSurface->isRealized() && !kbmcb->done())
{
// set up the frame stamp for current frame to record the current time and frame number so that animtion code can advance correctly
osg::FrameStamp* frameStamp = new osg::FrameStamp;
frameStamp->setReferenceTime(osg::Timer::instance()->delta_s(start_tick,osg::Timer::instance()->tick()));
frameStamp->setFrameNumber(frameNum++);
// pass frame stamp to the SceneView so that the update, cull and draw traversals all use the same FrameStamp
sceneView->setFrameStamp(frameStamp);
// pass any keyboard mouse events onto the local keyboard mouse callback.
kbm->update( *kbmcb );
// set the view
sceneView->setViewMatrix(kbmcb->getViewMatrix());
// update the viewport dimensions, incase the window has been resized.
sceneView->setViewport(0,0,renderSurface->getWindowWidth(),renderSurface->getWindowHeight());
// tell the DatabasePager the frame number of that the scene graph is being actively used to render a frame
databasePager->signalBeginFrame(frameStamp);
// syncronize changes required by the DatabasePager thread to the scene graph
databasePager->updateSceneGraph(frameStamp->getReferenceTime());
// do the update traversal the scene graph - such as updating animations
sceneView->update();
// do the cull traversal, collect all objects in the view frustum into a sorted set of rendering bins
sceneView->cull();
// draw the rendering bins.
sceneView->draw();
// tell the DatabasePager that the frame is complete and that scene graph is no longer be activity traversed.
databasePager->signalEndFrame();
// Swap Buffers
renderSurface->swapBuffers();
// clean up and compile gl objects with a specified limit
double availableTime = 0.0025; // 2.5 ms
// compile any GL objects that are required.
databasePager->compileGLObjects(*(sceneView->getState()),availableTime);
// flush deleted GL objects.
sceneView->flushDeletedGLObjects(availableTime);
}
// clear the database pager so its starts a fresh on the next update/cull/draw traversals
databasePager->clear();
// release the GL objects stored in the scene graph.
sceneView->releaseAllGLObjects();
// do a flush to delete all the OpenGL objects that have been deleted or released from the scene graph.
sceneView->flushAllDeletedGLObjects();
// reset the osg::State so that next time its used its in a cleaned state.
sceneView->getState()->reset();
}
// switch off the database pager by unreferencing it.
osgDB::Registry::instance()->setDatabasePager(0);
return 0;