96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
|
// 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*/
|