[osg-users] Read Image from RTT

[Robert Osfield]

Hi Rômulo,

Without the the line numbers on the source we can't match up the stack
trace crash point to lines of code.

Robert.
On Thu, 27 Sep 2018 at 20:45, Rômulo Cerqueira
<romulogcerqueira at gmail.com> wrote:
>
> Hi,
>
> I have tried to read image from RTT (where the image is "not attached", but available on buffer) using a osg::Camera::DrawCallback, the compilation is working, however the executable brings me a segmentation fault during image rendering. How can I solve this?
>
>
>
> Code:
> WindowCaptureScreen::WindowCaptureScreen(osg::ref_ptr<osg::GraphicsContext> gfxc, osg::Texture2D* tex) {
>     _mutex = new OpenThreads::Mutex();
>     _condition = new OpenThreads::Condition();
>     _image = new osg::Image();
>
>     // checks the GraficContext from the camera viewer
>     if (gfxc->getTraits()) {
>         _tex = tex;
>         int width = gfxc->getTraits()->width;
>         int height = gfxc->getTraits()->height;
>         _image->allocateImage(width, height, 1, GL_RGBA, GL_FLOAT);
>     }
> }
>
> WindowCaptureScreen::~WindowCaptureScreen() {
>     delete (_condition);
>     delete (_mutex);
> }
>
> osg::ref_ptr<osg::Image> WindowCaptureScreen::captureImage() {
>     //wait to finish the capture image in call back
>     _condition->wait(_mutex);
>
>     return _image;
> }
>
> void WindowCaptureScreen::operator ()(osg::RenderInfo& renderInfo) const {
>     osg::ref_ptr<osg::GraphicsContext> gfxc = renderInfo.getState()->getGraphicsContext();
>
>     if (gfxc->getTraits()) {
>         _mutex->lock();
>
>         // read the color buffer as 32-bit floating point
>         renderInfo.getState()->applyTextureAttribute(0, _tex);
>
>         // THE PROGRAM CRASHES HERE
>         _image->readImageFromCurrentTexture(renderInfo.getContextID(), true, GL_FLOAT);
>
>         // grants the access to image
>         _condition->signal();
>         _mutex->unlock();
>     }
> }
>
>
>
>
> Output from GDB:
>
>
> Code:
> #0  0xffffffffffffff88 in ?? ()
> #1  0x00007fffef1ee39d in normal_depth_map::WindowCaptureScreen::operator() (this=0x7fffb53ee7a0, renderInfo=...)
>     at /home/romulo/dev/sonarsim/simulation/normal_depth_map/src/ImageViewerCaptureTool.cpp:158
> #2  0x00007fffebb43b10 in osgUtil::RenderStage::draw(osg::RenderInfo&, osgUtil::RenderLeaf*&) ()
>    from target:/usr/lib/x86_64-linux-gnu/libosgUtil.so.100
> #3  0x00007fffebb4bdb7 in osgUtil::SceneView::draw() () from target:/usr/lib/x86_64-linux-gnu/libosgUtil.so.100
> #4  0x00007fffec31c03f in osgViewer::Renderer::draw() () from target:/usr/lib/x86_64-linux-gnu/libosgViewer.so.100
> #5  0x00007fffef557d49 in osg::GraphicsContext::runOperations() ()
>    from target:/usr/lib/x86_64-linux-gnu/libosg.so.100
> #6  0x00007fffef5a7bbf in osg::OperationThread::run() () from target:/usr/lib/x86_64-linux-gnu/libosg.so.100
> #7  0x00007fffef5596f8 in osg::GraphicsThread::run() () from target:/usr/lib/x86_64-linux-gnu/libosg.so.100
> #8  0x00007fffecbd06c8 in OpenThreads::ThreadPrivateActions::StartThread(void*) ()
>    from target:/usr/lib/x86_64-linux-gnu/libOpenThreads.so.20
> #9  0x00007ffff60246ba in start_thread (arg=0x7fffa7efe700) at pthread_create.c:333
> #10 0x00007ffff130f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
>
>
>
>
> Thanks in advance,
>
> Cheers,
> Rômulo
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=74982#74982
>
>
>
>
>
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