Hi,
I've some problems when my context get's renewed due
to pixelformat changes e.g. the user selected stereo
etc. I'm using qt 4.2.3 and I use it's setFormat method.
Qt recreates a new context behind the scenes and informs
the QGLWidget about the change by calling initializeGL.
So I'm ok OpenGL-context-wise. I'm not quite sure what
I'm supposed to do OpenSG-wise for getting the transition
right. After some experiments I figured out that it's
a good thing to recreate the PassiveWindow associated
to the context. See the code posted below. I get
some problems trying to cleanup the old passive
window though (crash, segfault, sorry no decent stack trace
at hand). But it get's more weird. When I comment
the lines that do the cleanup, the program seems
to work correctly on the first switch mono->stereo.
After switching back and forth for a while, my lighting
get's screwed, the light source seems to be black.
All this might be caused by an error inside
my program, but as this one was the last modification
I made to the code I suspect it's OpenSG's fault. Just
want to ask if the code below has some obvious errors..
Thank you and regards,
Toni
void
OpenSGWidget::initializeGL(){
static bool firstTime = true;
// every time a new context is created (e.g. when
// stereo format is requested through setFormat this
// function is called. To make OpenSG aware of the context
// change, we recreate the passiveWindow!
if( firstTime ){
firstTime = false;
mPwin->init();
mPwin->activate();
mPwin->frameInit();
mMgr->redraw();
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
}else{
PassiveWindowPtr mPwinNew = PassiveWindow::create();
PassiveWindowPtr oldWin = mPwin;
beginEditCP(mPwinNew);
// copy all viewports from old win to the new one.
for( unsigned int i = 0; i < mPwin->getPort().size(); ++i )
mPwinNew->addPort( mPwin->getPort()[i] );
endEditCP(mPwinNew);
mPwin = mPwinNew;
mMgr->setWindow(mPwin);
mPwin->init();
mPwin->activate();
mPwin->frameInit();
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
// cleanup old passive window and subref it.
unsigned int n = mPwin->getPort().size();
beginEditCP(oldWin);
for( unsigned int i = 0; i < n; ++i )
oldWin->subPort( 0 ); // makes osg crash
endEditCP(oldWin);
subRefCP(oldWin); // makes osg crash at exit!
mMgr->redraw();
}
printf( "OpenSGWidget::initializeGL\n" );
}
--
Ing. Antonio Bleile
Seac02 S.r.l.
via Avogadro 4
10121 Torino Italia
Tel. +39.011.197.006.52
Fax +39.011.197.006.53
E-mail [EMAIL PROTECTED]
Sito www.seac02.it
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