Hello,
I have a tricky problem with composite viewer. I will try to explain it.
We are developing an application for flight simulation with both terrain and
texture paging.
The problem occurs for the texture paging in a callback that loads textures
to the graphics card.
First of all I create two contexts and using one camera per context.
For each camera I add an update callback, for texture loading.
The callback class, that is called, holds a pointer to the graphics context.
Upon a callback call I
only get filled black polygons, when textures are loaded (for both
contexts). If I add a call to makeCurrent()
on the graphics context in the called method, my textures are shown for the
first
context as expected. However in the second context the textures are still
black.
// Setup composite viewer
viewer_ = new CompositeViewer;
viewer_->setThreadingModel(osgViewer::CompositeViewer::ThreadPerContext);
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits;
traits->x = 0;
traits->y = 0;
traits->width = 1280;
traits->height = 480;
traits->windowDecoration = false;
traits->doubleBuffer = true;
traits->sharedContext = 0;
traits->screenNum = 0;
//Create first context and add first View to the composite viewer
{
osg::ref_ptr<osg::GraphicsContext> gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
gc->createNewContextID();
if(gc.valid())
{
osgViewer::View* view = new osgViewer::View;
viewer_->addView(view);
//std::cout << "gc->createNewContextID();" << gc->createNewContextID()
<< std::endl;
view->addEventHandler(keyboardHandler_.get());
view->setSceneData(getSceneRoot());
view->addEventHandler(MouseFly::Instance());
view->getCamera()->setViewport(new osg::Viewport(0,0, traits->width,
traits->height));
view->getCamera()->setProjectionMatrixAsPerspective(45,
traits->width/traits->height, 10, 1000000);
view->getCamera()->setGraphicsContext(gc.get());
view->getCamera()->setNearFarRatio(0.5/30000.0);
osg::ref_ptr<UpdateTRAMCallback> TRAMupdateCallback = new
UpdateTRAMCallback();
osg::ref_ptr<SubloadTRAMCallback> TRAMsubloadCallback = new
SubloadTRAMCallback(gc.get());
osg::ref_ptr<osg::NodeCallback> nc = new osg::NodeCallback;
nc->addNestedCallback(TRAMsubloadCallback.get()); // once every
graphical context
nc->addNestedCallback(TRAMupdateCallback.get());
view->getCamera()->setUpdateCallback(nc.get());
}
}
traits->x = 0;
traits->y = 800;
//Create second context and add second View to the composite viewer
{
osg::ref_ptr<osg::GraphicsContext> gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
gc->createNewContextID();
if(gc.valid())
{
osgViewer::View* view = new osgViewer::View;
viewer_->addView(view);
view->addEventHandler(keyboardHandler_.get());
view->setSceneData(getSceneRoot());
view->addEventHandler(MouseFly::Instance());
view->getCamera()->setViewport(new osg::Viewport(0,0, traits->width,
traits->height));
view->getCamera()->setProjectionMatrixAsPerspective(45,
traits->width/traits->height, 10, 1000000);
view->getCamera()->setGraphicsContext(gc.get());
view->getCamera()->setNearFarRatio(0.5/30000.0);
osg::ref_ptr<UpdateTRAMCallback> TRAMupdateCallback = new
UpdateTRAMCallback();
osg::ref_ptr<SubloadTRAMCallback> TRAMsubloadCallback = new
SubloadTRAMCallback(gc.get());
osg::ref_ptr<osg::NodeCallback> nc = new osg::NodeCallback;
nc->addNestedCallback(TRAMsubloadCallback.get()); // once every
graphical context
nc->addNestedCallback(TRAMupdateCallback.get());
view->getCamera()->setUpdateCallback(nc.get());
}
}
viewer_->realize();
//Callback class methods
void SubloadTRAMCallback::operator()( osg::Node *node, osg::NodeVisitor
*nv )
{
// gc_->makeCurrent(); //If this is called we get a desired behaviour
for the first context.
TextureController::Instance()->subload((gc_.valid() ? gc_->getState() :
0));
traverse(node,nv);
}
When using a shared context instead of separate contexts the textures are
loaded correctly for both views.
Still the call to gc_->makeCurrent() is required.
For any other models with mapped textures everything works as expected in
both contexts. These models
are below one group node and the terrains (with textures loaded by the
callback) below another group node
in the scene.
Before we tried to use composite viewer we used producer and the
scenehandler from producerOSG. We used corresponding
callbacks for the prodcuer cameras. In this case the texures were drawn in
the same manner. When we used only one context
the textures were drawn as expected, but with two contexts all terrain
textures were drawn black. In producer we did not make
a call to makeCurrent().
OSG 2.0 / RHEL 5
Any ideas?
Thanks in advance!
//Karl
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