From Marco Jez, added new osgmotionblur example

examples/osgmotionblur/GNUmakefile

@@ -0,0 +1,18 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs 
+
+CXXFILES =\
+	osgmotionblur.cpp\
+
+LIBS     += -losgProducer -lProducer -losgText -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+INSTFILES = \
+	$(CXXFILES)\
+	GNUmakefile.inst=GNUmakefile
+
+EXEC = osgmotionblur
+
+INC +=  $(X_INC) 
+
+include $(TOPDIR)/Make/makerules 
+

examples/osgmotionblur/GNUmakefile.inst

@@ -0,0 +1,13 @@
+TOPDIR = ../..
+include $(TOPDIR)/Make/makedefs
+
+CXXFILES =\
+	osgmotionblur.cpp\
+
+LIBS     += -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS) 
+
+EXEC = osgmotionblur
+
+INC += $(X_INC)
+
+include $(TOPDIR)/Make/makerules

examples/osgmotionblur/osgmotionblur.cpp

@@ -0,0 +1,166 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
+ *
+ * This application is open source and may be redistributed and/or modified   
+ * freely and without restriction, both in commericial and non commericial applications,
+ * as long as this copyright notice is maintained.
+ * 
+ * This application is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+*/
+
+#include <osgDB/ReadFile>
+#include <osgUtil/Optimizer>
+#include <osgProducer/Viewer>
+
+class MotionBlurDrawCallback: public osgProducer::OsgSceneHandler::Callback
+{
+public:
+	MotionBlurDrawCallback(double persistence)
+	:	cleared_(false),
+		persistence_(persistence)
+	{
+	}
+
+	virtual void operator()(osgProducer::OsgSceneHandler &handler, Producer::Camera &camera)
+	{
+		double t = handler.getSceneView()->getFrameStamp()->getReferenceTime();
+
+		if (!cleared_)
+		{
+			// clear the accumulation buffer
+			glClearColor(0, 0, 0, 0);
+			glClear(GL_ACCUM_BUFFER_BIT);
+			cleared_ = true;
+			t0_ = t;
+		}
+
+		double dt = fabs(t - t0_);
+		t0_ = t;
+
+		// call the scene handler's draw function
+		handler.drawImplementation(camera);		
+
+		// compute the blur factor
+		double s = powf(0.2, dt / persistence_);
+
+		// scale, accumulate and return
+		glAccum(GL_MULT, s);
+		glAccum(GL_ACCUM, 1 - s);
+		glAccum(GL_RETURN, 1.0f);
+	}
+
+private:
+	bool cleared_;
+	double t0_;
+	double persistence_;
+};
+
+
+int main( int argc, char **argv )
+{
+
+    // use an ArgumentParser object to manage the program arguments.
+    osg::ArgumentParser arguments(&argc,argv);
+    
+    // set up the usage document, in case we need to print out how to use this program.
+    arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
+    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is an OpenSceneGraph example that shows how to use the accumulation buffer to achieve a simple motion blur effect.");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
+    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
+	arguments.getApplicationUsage()->addCommandLineOption("-P or --persistence","Set the motion blur persistence time");
+    
+
+    // construct the viewer.
+    osgProducer::Viewer viewer(arguments);
+
+    // set up the value with sensible default event handlers.
+    viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
+
+    // get details on keyboard and mouse bindings used by the viewer.
+    viewer.getUsage(*arguments.getApplicationUsage());
+
+    // if user request help write it out to cout.
+    if (arguments.read("-h") || arguments.read("--help"))
+    {
+        arguments.getApplicationUsage()->write(std::cout);
+        return 1;
+    }
+
+	double persistence = 0.25;
+	arguments.read("-P", persistence) || arguments.read("--persistence", persistence);
+
+    // report any errors if they have occured when parsing the program aguments.
+    if (arguments.errors())
+    {
+        arguments.writeErrorMessages(std::cout);
+        return 1;
+    }
+    
+    if (arguments.argc()<=1)
+    {
+        arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
+        return 1;
+    }
+
+    osg::Timer_t start_tick = osg::Timer::instance()->tick();
+
+    // read the scene from the list of file specified commandline args.
+    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
+
+    // if no model has been successfully loaded report failure.
+    if (!loadedModel) 
+    {
+        std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
+        return 1;
+    }
+
+    // any option left unread are converted into errors to write out later.
+    arguments.reportRemainingOptionsAsUnrecognized();
+
+    // report any errors if they have occured when parsing the program aguments.
+    if (arguments.errors())
+    {
+        arguments.writeErrorMessages(std::cout);
+    }
+
+    osg::Timer_t end_tick = osg::Timer::instance()->tick();
+
+    std::cout << "Time to load = "<<osg::Timer::instance()->delta_s(start_tick,end_tick)<<std::endl;
+
+    // optimize the scene graph, remove rendundent nodes and state etc.
+    osgUtil::Optimizer optimizer;
+    optimizer.optimize(loadedModel.get());
+
+    // pass the loaded scene graph to the viewer.
+    viewer.setSceneData(loadedModel.get());
+
+    // create the windows and run the threads.
+    viewer.realize();
+
+	// set our motion blur callback as the draw callback for each scene handler
+	osgProducer::Viewer::SceneHandlerList &shl = viewer.getSceneHandlerList();
+	for (osgProducer::Viewer::SceneHandlerList::iterator i=shl.begin(); i!=shl.end(); ++i)
+	{
+		(*i)->setDrawCallback(new MotionBlurDrawCallback(persistence));
+	}
+
+    while( !viewer.done() )
+    {
+        // wait for all cull and draw threads to complete.
+        viewer.sync();
+
+        // update the scene by traversing it with the the update visitor which will
+        // call all node update callbacks and animations.
+        viewer.update();
+         
+        // fire off the cull and draw traversals of the scene.
+        viewer.frame();
+        
+    }
+    
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
+
+    return 0;
+}