From Mike Weiblen, osgGLUTsimple and osgGLUTkeyboardmouse examples

examples/osgGLUTsimple/osgGLUTsimple.cpp

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+// C++ source file - (C) 2003 Robert Osfield, released under the OSGPL.
+// (C) 2005 Mike Weiblen http://mew.cx/ released under the OSGPL.
+// Simple example using GLUT to create an OpenGL window and OSG for rendering.
+// Derived from osgsimple.cpp
+
+#include <iostream>
+#ifdef WIN32
+#include <windows.h>
+#endif
+#include <GL/glut.h>
+#include <osg/Timer>
+#include <osgUtil/SceneView>
+#include <osgDB/ReadFile>
+
+osg::ref_ptr<osgUtil::SceneView> sceneView;
+osg::Timer_t start_tick;
+unsigned int frameNum;
+osg::Matrix viewMatrix;
+
+void display(void)
+{
+    // set up the frame stamp for current frame to record the current time and frame number so that animtion code can advance correctly
+    osg::ref_ptr<osg::FrameStamp> frameStamp = new osg::FrameStamp;
+    frameStamp->setReferenceTime(osg::Timer::instance()->delta_s(start_tick,osg::Timer::instance()->tick()));
+    frameStamp->setFrameNumber( frameNum++ );
+
+    // pass frame stamp to the SceneView so that the update, cull and draw traversals all use the same FrameStamp
+    sceneView->setFrameStamp( frameStamp.get() );
+
+    // set the view
+    sceneView->setViewMatrix( viewMatrix );
+
+    // do the update traversal the scene graph - such as updating animations
+    sceneView->update();
+
+    // do the cull traversal, collect all objects in the view frustum into a sorted set of rendering bins
+    sceneView->cull();
+
+    // draw the rendering bins.
+    sceneView->draw();
+
+    // Swap Buffers
+    glutSwapBuffers();
+    glutPostRedisplay();
+}
+
+void reshape( int w, int h )
+{
+    // update the viewport dimensions, in case the window has been resized.
+    sceneView->setViewport( 0, 0, w, h );
+}
+
+int main( int argc, char **argv )
+{
+    glutInit(&argc, argv);
+
+    if (argc<2)
+    {
+        std::cout << argv[0] <<": requires filename argument." << std::endl;
+        return 1;
+    }
+
+    // load the scene.
+    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFile(argv[1]);
+    if (!loadedModel)
+    {
+        std::cout << argv[0] <<": No data loaded." << std::endl;
+        return 1;
+    }
+
+    glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_ALPHA );
+    glutInitWindowPosition( 100, 100 );
+    glutInitWindowSize( 800, 600 );
+    glutCreateWindow( argv[0] );
+    glutDisplayFunc( display );
+    glutReshapeFunc( reshape );
+
+    // create the view of the scene.
+    sceneView = new osgUtil::SceneView;
+    sceneView->setDefaults();
+    sceneView->setSceneData(loadedModel.get());
+
+    // initialize the view to look at the center of the scene graph
+    const osg::BoundingSphere& bs = loadedModel->getBound();
+    viewMatrix.makeLookAt(bs.center()-osg::Vec3(0.0,2.0f*bs.radius(),0.0),bs.center(),osg::Vec3(0.0f,0.0f,1.0f));
+
+    // record the timer tick at the start of rendering.
+    start_tick = osg::Timer::instance()->tick();
+    frameNum = 0;
+
+    glutMainLoop();
+    return 0;
+}
+
+/*EOF*/