Hi Marco,
Marco Spoerl wrote:
> In my application (based on OpenSG 1.8), I use a single FBOViewport with
> changing TextureChunks. Which should be pretty much like a solution
> mentioned here:
>
> http://www.mail-archive.com/[email protected]/msg08847.html
>
> My FBOViewport is created as follows:
>
> // -----
> m_pViewportPass2 = OSG::FBOViewport::create();
> OSG::beginEditCP(m_pViewportPass2);
> m_pViewportPass2->setParent(pWindow);
> m_pViewportPass2->setRoot(pRootNode);
> m_pViewportPass2->setBackground(pBackground);
> m_pViewportPass2->setCamera(pCamera);
> m_pViewportPass2->setSize(0, 0, m_width - 1, m_height - 1);
> m_pViewportPass2->setStorageWidth(m_width);
> m_pViewportPass2->setStorageHeight(m_height);
> m_pViewportPass2->setGenCubemaps(false);
> m_pViewportPass2->setGenDepthmaps(false);
> m_pViewportPass2->setFboOn(true);
> m_pViewportPass2->setDirty(true);
> OSG::endEditCP(m_pViewportPass2);
> // -----
>
> Each time I use that viewport to grab something, the following code is
> executed:
>
> // -----
> OSG::beginEditCP(m_pViewportPass2);
> m_pViewportPass2->getTextures().push_back(pTexture);
> OSG::endEditCP(m_pViewportPass2);
>
> m_pViewportPass2->render(pAction);
>
> OSG::beginEditCP(m_pViewportPass2);
> m_pViewportPass2->getTextures().clear();
> OSG::endEditCP(m_pViewportPass2);
> // -----
>
> This leads to a massive memory leak. Each call to "render" allocates a
> block roughly the size of the image attached to "pTexture", which is
> never freed again.
>
> After narrowing down the problem to the changing textures, I tried to
> attach only one single fixed texture chunk, which eliminates the memory
> issue. But then I have the problem that I don't get any of the image
> data I need (to save to a file), i.e. I only get black textures. To get
> the rendered image out of the FBO and into the "pTexture", I tried both
> solutions from
>
> http://www.mail-archive.com/[email protected]/msg08846.html
>
> with and without setFboOn and setReadBuffer.
>
> Any hints how to get the data I need without the leaks?
>
Hm. Can you try to explicitly delete the textures (i.e. loop over the
getTextures() array and subRef each of them)? That shouldn't be
necessary, but it's the only thing I can think of.
Yours
Dirk
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