From Mike Weiblen's osgGL2 node kit which support the latest OpenGL 2.0 extensions.

examples/osgshaders/osgshaders.cpp

@@ -0,0 +1,123 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
+ * Copyright (C) 2003 3Dlabs Inc. Ltd.
+ *
+ * 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.
+*/
+
+/* file:	examples/osgshaders/osgshaders.cpp
+ * author:	Mike Weiblen 2003-07-14
+ *
+ * A simple app skeleton for viewing OpenGL Shading Language shaders;
+ * derived from osgviewer.cpp from OSG 0.9.4-2
+ *
+ * See http://www.3dlabs.com/opengl2/ for more information regarding
+ * the OpenGL Shading Language.
+*/
+
+#include <osgDB/ReadFile>
+#include <osgUtil/Optimizer>
+#include <osgProducer/Viewer>
+
+#define GL2SCENE
+osg::Node* GL2Scene();
+void GL2Update();
+
+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 the standard OpenSceneGraph example which loads and visualises 3d models.");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [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;
+    }
+    
+#ifdef GL2SCENE //(
+    osg::ref_ptr<osg::Node> loadedModel = GL2Scene();
+#else //)(
+    if (arguments.argc()<=1)
+    {
+        arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
+        return 1;
+    }
+
+    // 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;
+    }
+
+
+    // optimize the scene graph, remove rendundent nodes and state etc.
+    osgUtil::Optimizer optimizer;
+    optimizer.optimize(loadedModel.get());
+#endif //)
+
+    // set the scene to render
+    viewer.setSceneData(loadedModel.get());
+
+    // create the windows and run the threads.
+    viewer.realize();
+
+    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();
+#ifdef GL2SCENE //(
+	GL2Update();
+#endif //)
+         
+        // 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;
+}
+