Greetings,
I need to add geometry to the scenegraph on a second thread but it seems like
it won't work correctly.
The source below, taken from the tutorials with little changes, demonstrates
this.
If 'VERSION1' is defined, a new torus is created on a 2nd thread, 1 second
after the program starts. It will continuously print the message "WARNING:
recurse: core is Null, don't know what to do!" after.
If 'VERSION2' is defined instead, it works correctly.
Regards,
Miguel
The complete source of the demonstration program follows:
#include <OpenSG/OSGGLUT.h>
#include <OpenSG/OSGConfig.h>
#include <OpenSG/OSGSimpleGeometry.h>
#include <OpenSG/OSGGLUTWindow.h>
#include <OpenSG/OSGSimpleSceneManager.h>
#include <OpenSG/OSGThreadManager.h>
OSG_USING_NAMESPACE
using namespace std;
#define VERSION1
Real32 gluttime;
SimpleSceneManager *mgr;
NodePtr scene;
TransformPtr trans;
Thread* animationThread;
Barrier *syncBarrier;
int setupGLUT( int *argc, char *argv[] );
NodePtr createScenegraph(){
NodePtr n = makeTorus(.5,2,16,16);
trans = Transform::create();
beginEditCP(trans);
Matrix m;
m.setIdentity();
trans->setMatrix(m);
endEditCP(trans);
NodePtr transNode = Node::create();
beginEditCP(transNode);
transNode->setCore(trans);
transNode->addChild(n);
endEditCP(transNode);
return transNode;
}
//this function will run in a thread and simply will
//rotate the cube by setting a new transformation matrix
void rotate(void *args){
// we won't stop calculating new matrices....
while(true){
Matrix m;
m.setIdentity();
m.setRotate(Quaternion(Vec3f(0,1,0), gluttime/1000));
#ifdef VERSION1
static int done = 0;
// this will create some geometry after 1 second, won't work
gluttime = glutGet(GLUT_ELAPSED_TIME);
if (done == 0 && gluttime>1000) {
cout << "hi there!" << endl;
NodePtr t = makeTorus(.2,.5,8,16);
beginEditCP(scene);
scene->addChild(t);
endEditCP(scene);
done = 1;
}
#endif // VERSION1
beginEditCP(trans);
trans->setMatrix(m);
endEditCP(trans);
syncBarrier->enter(2);
syncBarrier->enter(2);
}
}
int main(int argc, char **argv)
{
// set read write
ChangeList::setReadWriteDefault();
osgInit(argc,argv);
int winid = setupGLUT(&argc, argv);
GLUTWindowPtr gwin= GLUTWindow::create();
gwin->setId(winid);
gwin->init();
scene =createScenegraph();
syncBarrier = Barrier::get(NULL);
mgr = new SimpleSceneManager;
mgr->setWindow(gwin );
mgr->setRoot (scene);
mgr->showAll();
animationThread = dynamic_cast<Thread
*>(ThreadManager::the()->getThread("anim"));
animationThread->runFunction(rotate, 1, NULL);
glutMainLoop();
return 0;
}
void reshape(int w, int h)
{
mgr->resize(w, h);
glutPostRedisplay();
}
void display(void)
{
syncBarrier->enter(2);
animationThread->getChangeList()->applyAndClear();
syncBarrier->enter(2);
#ifdef VERSION2
static int done = 0;
// this will create some geometry after 1 second, it works
gluttime = glutGet(GLUT_ELAPSED_TIME);
if (done == 0 && gluttime>1000) {
cout << "hi there!" << endl;
NodePtr t = makeTorus(.2,.5,8,16);
beginEditCP(scene);
scene->addChild(t);
endEditCP(scene);
done = 1;
}
#endif // VERSION2
mgr->redraw();
}
void mouse(int button, int state, int x, int y)
{
if (state)
mgr->mouseButtonRelease(button, x, y);
else
mgr->mouseButtonPress(button, x, y);
glutPostRedisplay();
}
void motion(int x, int y)
{
mgr->mouseMove(x, y);
glutPostRedisplay();
}
int setupGLUT(int *argc, char *argv[])
{
glutInit(argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
int winid = glutCreateWindow("OpenSG First Application");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutReshapeFunc(reshape);
glutIdleFunc(display);
return winid;
}
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