<div dir="ltr">Hi Robert,<div><br></div><div>I am using code extracted from the osgscreencapture example to generate small thumbnails of loaded shapes.</div><div>It all work is very nicely except that it is leaking memory on each usage. I have commented out our code and based on that and a few other tests I am fairly convinced that the leak is the pixel buffer (GraphicsContext) itself.</div><div><br></div><div><br></div><div><div class="prettyprint" style="background-color: rgb(250, 250, 250); border-color: rgb(187, 187, 187); border-style: solid; border-width: 1px; overflow-wrap: break-word;"><code class="prettyprint"><div class="subprettyprint"><font color="#666600"><span style="color: #000;" class="styled-by-prettify">osg</span><span style="color: #660;" class="styled-by-prettify">::</span><span style="color: #000;" class="styled-by-prettify">ref_ptr</span><span style="color: #660;" class="styled-by-prettify"><</span><span style="color: #000;" class="styled-by-prettify">osg</span><span style="color: #660;" class="styled-by-prettify">::</span><span style="color: #606;" class="styled-by-prettify">GraphicsContext</span><span style="color: #660;" class="styled-by-prettify">></span></font></div></code><div class="subprettyprint"><font color="#666600" face="monospace">createPixelBuffer(int aSize, int aNumSamples)</font></div><div class="subprettyprint"><font color="#666600" face="monospace">{</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->x = 0;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->y = 0;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->width = aSize;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->height = aSize;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->red = 8;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->green = 8;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->blue = 8;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->alpha = 8;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->windowDecoration = false;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->pbuffer = true;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->doubleBuffer = true;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->sharedContext = 0;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->readDISPLAY();</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->setUndefinedScreenDetailsToDefaultScreen();</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace"> if (aNumSamples != 0)</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> {</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->sampleBuffers = 1;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> traits->samples = aNumSamples;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> }</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace"> return osg::GraphicsContext::createGraphicsContext(traits.get());</font></div><div class="subprettyprint"><font color="#666600" face="monospace">}</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace">bool</font></div><div class="subprettyprint"><font color="#666600" face="monospace">generateThumbnail(const std::string & aFilePath,</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> const std::string & aThumbnailPath,</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> const std::string & aResourcesPath,</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> int aSize,</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> bool aTopDownView)</font></div><div class="subprettyprint"><font color="#666600" face="monospace">{</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> auto pixelBuffer = createPixelBuffer(aSize, 8);</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> if (!pixelBuffer)</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> {</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> pixelBuffer = createPixelBuffer(aSize, 0);</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> }</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace">// const auto shape = loadShapeOrError(aFilePath);</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace"> osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> auto camera = viewer->getCamera();</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace"> camera->setGraphicsContext(pixelBuffer.get());</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> camera->setViewport(new osg::Viewport(0, 0, aSize, aSize));</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> camera->setDrawBuffer(GL_BACK);</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> camera->setReadBuffer(GL_BACK);</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace">// setupShapeViewer(viewer, shape.get(), aResourcesPath, aTopDownView);</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace">// osg::ref_ptr<ImageGrabber> grabber = new ImageGrabber(aThumbnailPath);</font></div><div class="subprettyprint"><font color="#666600" face="monospace">// viewer.getCamera()->setPostDrawCallback(grabber.get());</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace"> viewer->realize();</font></div><div class="subprettyprint"><font color="#666600" face="monospace"> viewer->frame();</font></div><div class="subprettyprint"><font color="#666600" face="monospace"><br></font></div><div class="subprettyprint"><font color="#666600" face="monospace"> return true;</font></div><div class="subprettyprint"><font color="#666600" face="monospace">};</font></div><div><br></div></div><br>If I call the above code repeatedly then it leaks and I cannot understand why since everything is in osg:ref_ptr<>. </div><div>The Viewer was a concrete instance originally but that makes no difference.</div><div>I have also tried using a slave camera as in the original example.</div><div>I have a nasty workaround of extracting a shared pixel buffer and re-using it - but ideally this code would be called using std::async, to have multiple thumbnails generated in parallel, so that is going to be tricky.</div><div><br></div><div>Kinda hoping you can point to my stupid mistake in how I am using osg ;)</div><div><br></div><div>Thanks,</div><div><br></div><div>Brian</div><div><br></div><div><br></div></div>
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