Hi Julien, My best guess is that your callback is being called when OpenGL is not set up fully to apply the texture your are applying - effectively you are apply a texture to an indeterminate texture unit with an indeterminate enabling of modes, so in effect you'll be just inheriting whatever has been applied before rather than exactly what you want.
The use of node is also pretty odd way to manage callbacks that are attached at the viewer level. Your code segment leaves us to guess lots of what might or might not be happening in the rest of your app, and what you might be trying to do with the code. Could you take a step back and explain from a high level you are attempting to do in your application and then others can suggest the appropriate way to tackle such functionality. Robert. On 12 November 2014 17:22, Julien Valentin <[email protected]> wrote: > Hi, > Hi, > I just implement a kind of dirty texture read back node and ran into a > weird problem: > As you can notice in the attached code, I had a problem with > Image::readImageFromCurrentTexture. > I would like to read back a 2D texture but a 1D texture is binded too. > The 1D->2d->3d->cubemap priority scheme in osg::Image > ( GLenum textureMode = binding1D ? GL_TEXTURE_1D : binding2D ? > GL_TEXTURE_2D : binding3D ? GL_TEXTURE_3D : binding2DArray ? > GL_TEXTURE_2D_ARRAY_EXT : 0; > ) > forced me to disable the 1D binding explicitly. > > My opinion is that a priority scheme is not enough to decide which texture > binding to read-back (all texture binding mode can be activated at the same > time, am i right?) > > So,my proposal would be to make textureMode a parameter of > readImageFromCurrentTexture. > > Further, I don't think my node removal code is thread safe so don't pay > attention to it (its work for my signl_threaded test) > > Code: > > class ImageReadBackNode:public osg::Group{ > > void ImageReadBackNode::setTexture(osg::Texture*tex){ > //assert(tex->getImage()); > class ImageReadBackNodeCallback : public osg::Camera::DrawCallback > { > osg::Texture *_texture; osg::Node *_n; > public: > ImageReadBackNodeCallback(osg::Texture *texture, > osg::Node*toremove) :_texture(texture), _n(toremove){ }; > > virtual void operator () (osg::RenderInfo& renderInfo) > const > { > // get OpenGL driver to create texture from image. > _texture->apply(*renderInfo.getState()); > ///BAD > glBindTexture(GL_TEXTURE_1D, 0); > glDisable(GL_TEXTURE_1D); > > _texture->getImage()->readImageFromCurrentTexture(renderInfo.getContextID(),true,_texture->getSourceType()); > > glEnable(GL_TEXTURE_1D); > > > ///Node self removal in drawthread (dirty but seams to works:/ ..) > THREADSAFE? > std::list<osg::Group*> gr; > for (int i = 0; i < _n->getNumParents(); > i++)gr.push_back((_n->getParent(i))); > for (std::list<osg::Group*>::iterator it = > gr.begin(); it != gr.end(); it++) > (*it)->removeChild(_n); > > } > }; > osg::ref_ptr<osg::Camera > cam = new osg::Camera(); > cam->setFinalDrawCallback(new ImageReadBackNodeCallback(tex,this)); > this->addChild(cam); > > } > }; > > > > Thank you! > Any advice would be welcome > Cheers, > Julien > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=61597#61597 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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