Ported osgGLUT based src/Demos across to being osgProducer based, and placed

them in the new examples/ directory.

examples/osgscribe/osgscribe.cpp

@@ -0,0 +1,129 @@
+#include <osg/Geode>
+#include <osg/Group>
+#include <osg/Notify>
+#include <osg/Material>
+#include <osg/PolygonOffset>
+#include <osg/PolygonMode>
+#include <osg/LineStipple>
+
+#include <osgDB/Registry>
+#include <osgDB/ReadFile>
+
+#include <osgGA/TrackballManipulator>
+#include <osgGA/FlightManipulator>
+#include <osgGA/DriveManipulator>
+
+#include <osgProducer/Viewer>
+
+#include <osgUtil/Optimizer>
+
+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()->setCommandLineUsage(arguments.getProgramName()+" [options] filename ...");
+    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
+   
+    // 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;
+    }
+
+    // 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);
+        return 1;
+    }
+
+    // load the nodes from the commandline arguments.
+    osg::Node* loadedModel = osgDB::readNodeFiles(arguments);
+    if (!loadedModel)
+    {
+        return 1;
+    }
+  
+    // to do scribe mode we create a top most group to contain the
+    // original model, and then a second group contains the same model
+    // but overrides various state attributes, so that the second instance
+    // is rendered as wireframe.
+    
+    osg::Group* rootnode = new osg::Group;
+
+    osg::Group* decorator = new osg::Group;
+    
+    rootnode->addChild(loadedModel);
+    
+    
+    rootnode->addChild(decorator);
+    
+    decorator->addChild(loadedModel);  
+
+    // set up the state so that the underlying color is not seen through
+    // and that the drawing mode is changed to wireframe, and a polygon offset
+    // is added to ensure that we see the wireframe itself, and turn off 
+    // so texturing too.
+    osg::StateSet* stateset = new osg::StateSet;
+    osg::Material* material = new osg::Material;
+    osg::PolygonOffset* polyoffset = new osg::PolygonOffset;
+    polyoffset->setFactor(-1.0f);
+    polyoffset->setUnits(-1.0f);
+    osg::PolygonMode* polymode = new osg::PolygonMode;
+    polymode->setMode(osg::PolygonMode::FRONT_AND_BACK,osg::PolygonMode::LINE);
+    stateset->setAttributeAndModes(material,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
+    stateset->setAttributeAndModes(polyoffset,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
+    stateset->setAttributeAndModes(polymode,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
+    stateset->setMode(GL_LIGHTING,osg::StateAttribute::OVERRIDE|osg::StateAttribute::OFF);
+    stateset->setTextureMode(0,GL_TEXTURE_2D,osg::StateAttribute::OVERRIDE|osg::StateAttribute::OFF);
+    
+//     osg::LineStipple* linestipple = new osg::LineStipple;
+//     linestipple->setFactor(1);
+//     linestipple->setPattern(0xf0f0);
+//     stateset->setAttributeAndModes(linestipple,osg::StateAttribute::OVERRIDE_ON);
+    
+    decorator->setStateSet(stateset);
+  
+    
+    // run optimization over the scene graph
+    osgUtil::Optimizer optimzer;
+    optimzer.optimize(rootnode);
+     
+    // add a viewport to the viewer and attach the scene graph.
+    viewer.setSceneData( rootnode );
+    
+    // create the windows and run the threads.
+    viewer.realize(Producer::CameraGroup::ThreadPerCamera);
+
+    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();
+        
+    }
+
+    return 0;
+}