Added a realize callback to the OsgCameraGroup.

Move osgtexture3D across to using the new realize callback for creating its textures.

examples/osgtexture3D/osgtexture3D.cpp

@@ -24,10 +24,10 @@
 typedef std::vector< osg::ref_ptr<osg::Image> > ImageList;
 
 
-class ConstructStateCallback : public osg::NodeCallback
+class ConstructStateCallback : public osgProducer::OsgCameraGroup::RealizeCallback
 {
     public:
-        ConstructStateCallback() {}
+        ConstructStateCallback(osg::Node* node):_node(node),_initialized(false) {}
         
         osg::StateSet* constructState()
         {
@@ -82,6 +82,7 @@ class ConstructStateCallback : public osg::NodeCallback
             osg::Texture3D* texture3D = new osg::Texture3D;
             texture3D->setFilter(osg::Texture3D::MIN_FILTER,osg::Texture3D::LINEAR);
             texture3D->setFilter(osg::Texture3D::MAG_FILTER,osg::Texture3D::LINEAR);
+            texture3D->setWrap(osg::Texture3D::WRAP_R,osg::Texture3D::REPEAT);
             texture3D->setImage(image_3d);
 
 
@@ -103,6 +104,32 @@ class ConstructStateCallback : public osg::NodeCallback
             return stateset;
         }
 
+        virtual void operator()(const Producer::RenderSurface&, osgProducer::OsgCameraGroup* , osgProducer::OsgSceneHandler* sh)
+        { 
+            if (!_initialized)
+            {
+                // only initialize state once, only need for cases where multiple graphics contexts are
+                // if which case this callback can get called multiple times.
+                _initialized = true;
+
+                if (_node) _node->setStateSet(constructState());
+            }            
+            // now safe to con
+            sh->init();
+            
+        }
+        
+        
+        osg::Node*  _node;
+        bool        _initialized;
+        
+};
+
+class UpdateStateCallback : public osg::NodeCallback
+{
+    public:
+        UpdateStateCallback() {}
+        
         void animateState(osg::StateSet* stateset)
         {
             // here we simply get any existing texgen, and then increment its
@@ -113,7 +140,7 @@ class ConstructStateCallback : public osg::NodeCallback
             {
                 texgen->getPlane(osg::TexGen::R)[3] += 0.001f;
             }
-            
+
         }
 
         virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
@@ -125,14 +152,6 @@ class ConstructStateCallback : public osg::NodeCallback
                 // we have an exisitng stateset, so lets animate it.
                 animateState(stateset);
             }
-            else
-            {
-                // no state exist yet, so we must be in the first
-                // pass, so lets create our stateset with all the 
-                // textures in it.
-                stateset = constructState();
-                if (stateset) node->setStateSet(stateset);
-            }
 
             // note, callback is repsonsible for scenegraph traversal so
             // should always include call the traverse(node,nv) to ensure 
@@ -189,7 +208,7 @@ osg::Node* createModel()
     // A bit hacky, and my plan is to reimplement the osg::scaleImage and
     // osg::Image::copySubImage() without using GLU which will get round
     // this current limitation.
-    geode->setUpdateCallback(new ConstructStateCallback());
+    geode->setUpdateCallback(new UpdateStateCallback());
     
     return geode;
 
@@ -241,6 +260,11 @@ int main( int argc, char **argv )
 
         // set the scene to render
         viewer.setSceneData(rootNode);
+        
+        // the construct state uses gl commands to resize images so we are forced
+        // to only call it once a valid graphics context has been established,
+        // for that we use a realize callback.
+        viewer.setRealizeCallback(new ConstructStateCallback(rootNode));
 
         // create the windows and run the threads.
         viewer.realize(Producer::CameraGroup::ThreadPerCamera);

include/osgProducer/OsgCameraGroup

@@ -105,12 +105,40 @@ class OSGPRODUCER_EXPORT OsgCameraGroup : public Producer::CameraGroup
         void setFusionDistance( osgUtil::SceneView::FusionDistanceMode mode,float value=1.0f);
 
 
+        /** RealizeCallback class one should override to provide an the implemention of realize callbacks.
+          * Note, this callback overrides the normal call to OsgSceneHandler::init() so it become the your
+          * responisibility to call this within your callback if required, it is a safe assumption to
+          * always call OsgSceneHandler::init() within your callback..*/
+        class OSGPRODUCER_EXPORT RealizeCallback : public osg::Referenced
+        {
+        public:
+            virtual void operator()( const Producer::RenderSurface & rs, OsgCameraGroup* cg, OsgSceneHandler* sh) = 0;
+            
+        protected:
+            virtual ~RealizeCallback() {}
+        };
+
+        /** Set the realize callback to use when once the render surfaces are realized.*/
+        void setRealizeCallback( RealizeCallback* cb) { _realizeCallback = cb; }
+
+        /** Get the realize callback.*/
+        RealizeCallback* getRealizeCallback() { return _realizeCallback.get(); }
+        
+        /** Get the const realize callback.*/
+        const RealizeCallback* getRealizeCallback() const { return _realizeCallback.get(); }
+        
+
+
+
+
         void advance();
 
 
+        /** Realize the render surfaces (OpenGL graphics) and various threads, and call any realize callbacks.*/
         virtual void realize( ThreadingModel thread_model= SingleThreaded );
 
 
+        /** Dispatch the cull and draw for each of the Camera's for this frame.*/
         virtual void frame();
 
 
@@ -130,6 +158,9 @@ class OSGPRODUCER_EXPORT OsgCameraGroup : public Producer::CameraGroup
         float                                   _fusionDistanceValue;
         
         SceneHandlerList                        _shvec;
+        
+        osg::ref_ptr<RealizeCallback>           _realizeCallback;
+        
         osg::ref_ptr<osg::DisplaySettings>      _ds;
         bool                                    _initialized;
         osg::ref_ptr<osg::FrameStamp>           _frameStamp;

src/osgProducer/OsgCameraGroup.cpp

@@ -19,6 +19,37 @@
 using namespace Producer;
 using namespace osgProducer;
 
+
+
+
+class RenderSurfaceRealizeCallback : public Producer::RenderSurface::Callback
+{
+public:
+
+    RenderSurfaceRealizeCallback(OsgCameraGroup* cameraGroup,OsgSceneHandler* sceneHandler):
+        _cameraGroup(cameraGroup),
+        _sceneHandler(sceneHandler) {}
+    
+    virtual void operator()( const RenderSurface & rs)
+    {
+        if (_cameraGroup)
+        {
+            if (_cameraGroup->getRealizeCallback())
+            {
+                (*(_cameraGroup->getRealizeCallback()))(rs,_cameraGroup,_sceneHandler);
+            }
+            else if (_sceneHandler) _sceneHandler->init();
+        }
+        else if (_sceneHandler) _sceneHandler->init();
+    }
+
+    OsgCameraGroup* _cameraGroup;
+    OsgSceneHandler* _sceneHandler;
+
+};
+
+
+
 std::string findCameraConfigFile(const std::string& configFile)
 {
     std::string foundFile = osgDB::findDataFile(configFile);
@@ -191,29 +222,25 @@ void OsgCameraGroup::realize( ThreadingModel thread_model)
     if (!_ds) _ds = osg::DisplaySettings::instance();
 
     _ds->setMaxNumberOfGraphicsContexts( _cfg->getNumberOfCameras() );
+    
+    _shvec.clear();
 
     for( unsigned int i = 0; i < _cfg->getNumberOfCameras(); i++ )
     {
         Producer::Camera *cam = _cfg->getCamera(i);
         osgProducer::OsgSceneHandler *sh = new osgProducer::OsgSceneHandler(_ds.get());
         sh->setDefaults();
-        if( _global_stateset != NULL )
-            sh->setGlobalStateSet( _global_stateset.get() );
-        if( _scene_data != NULL )
-            sh->setSceneData( _scene_data.get() );
-        sh->setBackgroundColor( _background_color);
-        sh->getState()->setContextID(i);
-        sh->setFrameStamp( _frameStamp.get() );
         _shvec.push_back( sh );
-
         cam->setSceneHandler( sh );
+        RenderSurface* rs = cam->getRenderSurface();
+        rs->setRealizeCallback( new RenderSurfaceRealizeCallback(this, sh));
     }
 
     if( _global_stateset == NULL && _shvec.size() > 0 )
-	{
+    {
         SceneHandlerList::iterator p = _shvec.begin();
-		_global_stateset = (*p)->getGlobalStateSet();
-	}
+        _global_stateset = (*p)->getGlobalStateSet();
+    }
 
     setUpSceneViewsWithData();