Hi All!
I want to load a highResTexture while zooming to the object with a
lowResTexture in a seperate Thread, which gets started here:
void OverlayViewport::selectImage(ImageMetaInfo* imageMetaInfo)
{
// If we are flying towards another Object, it should not load his
texture anymore
if (!_targetReached)
{
Thread* imageLoadingThread = dynamic_cast<Thread
*>(ThreadManager::the()->getThread("imageLoadingThread"));
imageLoadingThread->terminate();
}
_targetReached = false;
ImageMetaInfo::getCurrent()->switchTexture( false) ;
Thread* imageLoadingThread = dynamic_cast<Thread
*>(ThreadManager::the()->getThread("imageLoadingThread"));
imageLoadingThread->runFunction( switchTextureHighRes, 1,
imageMetaInfo);
ImageMetaInfo::setCurrent(imageMetaInfo);
}
No here comes the part, that goes in the extra Thread:
void switchTextureHighRes(void *args)
{
ImageMetaInfo* meta = (ImageMetaInfo*) args;
meta->switchTexture(true);
Barrier* syncBarrier;
syncBarrier = Barrier::get("imageLoadingSyncBarrier");
syncBarrier->enter(2);
// here the main thread can get the ChangeList
syncBarrier->enter(2);
}
which calls this :
void ImageMetaInfo::switchTexture( bool high)
{
ImagePtr tmpImage;
if (high)
{
tmpImage = Image::create();
if (!tmpImage->read( path.c_str() ))
{
printf("Image %s could NOT be READ. Consult
OpenSG.log.txt !\n",path.c_str());
}
beginEditCP(_simpleTexturedMaterialPtr);
_simpleTexturedMaterialPtr->setImage( tmpImage);
endEditCP(_simpleTexturedMaterialPtr);
}
else
{
beginEditCP(_simpleTexturedMaterialPtr);
_simpleTexturedMaterialPtr->setImage( _lowResTexture);
endEditCP(_simpleTexturedMaterialPtr);
}
}
When the camera is before the object I want to get the image:
void OverlayViewport::targetReached()
{
getImageFromLoadingThread();
_targetReached = true;
}
void OverlayViewport::getImageFromLoadingThread()
{
Thread* imageLoadingThread;
Barrier* syncBarrier;
imageLoadingThread = dynamic_cast<Thread
*>(ThreadManager::the()->getThread("imageLoadingThread"));
syncBarrier = Barrier::get("imageLoadingSyncBarrier");
syncBarrier->enter(2);
imageLoadingThread->getChangeList()->applyAndClear();
syncBarrier->enter(2);
}
This is similiar to what Oliver Abert did it in the tutorials. It does
work, though I am not sure if it is water-proof.
So I would be glad if one or another could have a look at my code.
And there seems to be memory leaks, I thought the highResImages would be
killed out of memory if i set it back to
beginEditCP(_simpleTexturedMaterialPtr);
_simpleTexturedMaterialPtr->setImage( _lowResTexture);
endEditCP(_simpleTexturedMaterialPtr);
Is that so?
And when i terminate the thread before it is done, it could just be
loading the image and i dont know if termination is safe then.
Perhaps the leak is somewhere else, i'll try to get a non-crashing
shutdown to test that :-)
Greetings,
Tobias Kilian
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