Antonio Bleile wrote:
> Hi Andreas,
>
> late response, but I just got into it right now:
>
> Andreas Zieringer wrote:
>> Hi Antonio,
>>
>>> Hi,
>>>
>>> just a quick question, why is this code leaking
>>> memory:
>>>
>>> while( true ){
>>> beginEditCP(m_pFBO, FBOViewport::CameraFieldMask);
>>> m_pFBO->setCamera(PerspectiveCamera::create());
>>> endEditCP(m_pFBO, FBOViewport::CameraFieldMask);
>>> }
>>>
>>> ???
- please see below -
>>>
>>> Shouldn't the setCamera method destroy implicitly the old
>>> camera set on the viewport (he should hold the last
>>> reference to the old camera!)
>>
>> yes, try this: Thread::getCurrent()->getChangeList()->clearAll();
>
> It doesn't work as I expect it to work. I attached a modified
> version of the first tutorial. In each render loop it creates
> some osg instances. When you press <esc> it prints a list of
> non deallocated instances. All instances created in the loop
> are still alive. Only calling explicitly subRefCP frees the
> memory. Doing something like:
>
> PassiveBackgroundPtr pw;
>
> while( true )
> pw = PassiveBackground::create();
>
> leads to memory leaks. Also calling getChangeList()->clearAll()
> doesn't help much. Is this behaviour by design?
yes, <SomeContainer>Ptr is not a reference counting pointer, if you need
that please use <SomeContainer>RefPtr.
In the example the ref count of all PassiveBackgrounds remains zero all
the time and is never touched and since destruction only happens when
the ref count is decreased these object stay alive. If you add them to a
container and then later remove them again the ref count goes up to one
first and then is decreased back to zero and the object is destroyed.
I'll have a look at the FBOViewport if there something is wrong, because
your first example should not leak for exactly these reasons.
Carsten
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