I have been tracking down some bugs in an application so I am sprinkling
commitChanges() calls throughout my code. I know that sounds a bit
imprecise, but we have found it to be the best way to find some bugs in
OpenSG2 right now.
Anyway... I just ran into a bug. When I run the following code it
segfaults in the first few (2-5) iterations through the loop.
...
NodeRefPtr scene;
scene = SceneFileHandler::the()->read(argv[1]);
for(unsigned x=0; x<10000; x++)
{
std::cout << x << std::endl;
scene = SceneFileHandler::the()->read(argv[1]);
commitChanges(); // Is there a growing change list?
}
...
Is commit changes not safe to call in this way?
-Allen
// OpenSG Tutorial Example: Loading
//
// This example shows how to load a scene file using OpenSG.
// The supported formats right now are VRML97, OBJ, OFF and RAW, so just
// calling this program with a scene file as a parameter should load the scene
// file.
//
// Headers
#include <OpenSG/OSGGLUT.h>
#include <OpenSG/OSGConfig.h>
#include <OpenSG/OSGSimpleGeometry.h>
#include <OpenSG/OSGGLUTWindow.h>
#include <OpenSG/OSGSimpleSceneManager.h>
#include <OpenSG/OSGAction.h>
// New Headers
// the general scene file loading handler
#include <OpenSG/OSGSceneFileHandler.h>
#include <boost/bind.hpp>
// Activate the OpenSG namespace
OSG_USING_NAMESPACE
// The SimpleSceneManager to manage simple applications
SimpleSceneManager *mgr;
// forward declaration so we can have the interesting stuff upfront
int setupGLUT( int *argc, char *argv[] );
// helper class to find a named node
// names are handled as simple attachments, get the header for that
#include <OpenSG/OSGSimpleAttachments.h>
// There are two convenience functions for name access: getName() and
// setName(). For details about general attachment handling see the
// attachments tutorial
class NamedNodeFinder
{
public:
NamedNodeFinder(void) : _name(), _found() {}
NodePtr operator() (NodePtr root, std::string name)
{
_name=&name;
_found=NullFC;
TraverseEnterFunctor enter =
boost::bind(&NamedNodeFinder::check, this, _1);
traverse(root, enter);
return _found;
}
static NodePtr find(NodePtr root, std::string name)
{
NamedNodeFinder f;
return f(root,name);
}
private:
Action::ResultE check(NodePtr node)
{
if(getName(node) && *_name == getName(node))
{
_found = node;
return Action::Quit;
}
return Action::Continue;
}
NodePtr _found;
std::string *_name;
};
// Initialize GLUT & OpenSG and set up the scene
int main(int argc, char **argv)
{
// OSG init
osgInit(argc,argv);
// GLUT init
int winid = setupGLUT(&argc, argv);
// the connection between GLUT and OpenSG
GLUTWindowPtr gwin= GLUTWindow::create();
gwin->setId(winid);
gwin->init();
// load the scene
NodeRefPtr scene;
if(argc < 2)
{
FWARNING(("No file given!\n"));
FWARNING(("Supported file formats:\n"));
std::list<const char*> suffixes;
SceneFileHandler::the()->getSuffixList(suffixes);
//SceneFileHandler::the()->print();
for(std::list<const char*>::iterator it = suffixes.begin();
it != suffixes.end();
++it)
{
FWARNING(("%s\n", *it));
}
scene = makeTorus(.5, 2, 16, 16);
}
else
{
/*
All scene file loading is handled via the SceneFileHandler.
*/
scene = SceneFileHandler::the()->read(argv[1]);
for(unsigned x=0; x<10000; x++)
{
std::cout << x << std::endl;
scene = SceneFileHandler::the()->read(argv[1]);
commitChanges(); // Is there a growing change list?
//scene = NullFC; // Do we need to wipe directly?
}
}
NodePtr found;
NamedNodeFinder f;
// Try to find the Scene object. As it hasn't been named yet,
// it's not expected to be found.
found = f(scene, "Scene");
if(found == NullFC)
{
SLOG << "Found no object named Scene." << endLog;
}
else
{
SLOG << "Found object " << found << " named Scene. How did that happen?"
<< endLog;
}
// Try to find the TF_DETAIL object. An object in Data/tie.wrl is called
// TF_DETAIL, so we might find it.
found = NamedNodeFinder::find(scene, "TF_DETAIL");
if(found == NullFC)
{
SLOG << "Found no object named TF_DETAIL (did you load the tie?)."
<< endLog;
}
else
{
SLOG << "Found object " << found << " named TF_DETAIL." << endLog;
}
commitChanges();
// create the SimpleSceneManager helper
mgr = new SimpleSceneManager;
// tell the manager what to manage
mgr->setWindow(gwin );
mgr->setRoot (scene);
// show the whole scene
mgr->showAll();
// GLUT main loop
glutMainLoop();
return 0;
}
//
// GLUT callback functions
//
// redraw the window
void display(void)
{
mgr->idle();
mgr->redraw();
}
// react to size changes
void reshape(int w, int h)
{
mgr->resize(w, h);
glutPostRedisplay();
}
// react to mouse button presses
void mouse(int button, int state, int x, int y)
{
if (state)
mgr->mouseButtonRelease(button, x, y);
else
mgr->mouseButtonPress(button, x, y);
glutPostRedisplay();
}
// react to mouse motions with pressed buttons
void motion(int x, int y)
{
mgr->mouseMove(x, y);
glutPostRedisplay();
}
// react to keys
void keyboard(unsigned char k, int , int )
{
switch(k)
{
case 27:
{
OSG::osgExit();
exit(0);
}
break;
case 'f':
{
mgr->setNavigationMode(Navigator::FLY);
}
break;
case 't':
{
mgr->setNavigationMode(Navigator::TRACKBALL);
}
break;
}
}
// setup the GLUT library which handles the windows for us
int setupGLUT(int *argc, char *argv[])
{
glutInit(argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
int winid = glutCreateWindow("OpenSG");
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutIdleFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
return winid;
}
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