I am using a 3rd party lib(QCAR) with OSG on Android. This lib clears OpenGLES graphics  context every time after rendering a frame. So the model renders only once (first time) and disappears  on the viewer. So to preserve graphics context i did as follows

---> Created Embeded View
---> Captured current Graphics context as follws

Code:
        m_lastStateSet = new osg::StateSet();
_viewer->getCamera()->getGraphicsContext()->getState()->captureCurrentState (*m_lastStateSet.get());

---> In RendererFrame function
      ---> Restore graphics context as follows

Code:
    osgState = _viewer->getCamera()->getGraphicsContext()->getState();
    osgState->reset();
    osgState->apply(m_lastStateSet.get());

    ---> render Frame Code

    ----> Save the current state of the graphics context as follows

Code:
_viewer->getCamera()->getGraphicsContext()->getState()->captureCurrentState (*m_lastStateSet.get());

This works fine with OpenGLES1. The same is not working if I build the same code with OpenGLES2 version.

Can you please help me what could be the mistake.

Here is the complete code

OSG INIT Function

Code:
 void OsgApp::initOsgWindow(int sW,int sH)
     {
_viewer = new osgViewer::Viewer();
        embeddedWindow=_viewer->setUpViewerAsEmbeddedInWindow(x, y, width, height);
          _root = new osg::Group();

        _viewer->realize();
        _state = _root->getOrCreateStateSet();
        _state->setMode(GL_LIGHTING, osg::StateAttribute::ON);
        _state->setMode(GL_DEPTH_TEST, osg::StateAttribute::ON);
        _state->setMode(GL_CULL_FACE, osg::StateAttribute::ON);

        //_viewer->setSceneData(_root.get());

         _viewer->addEventHandler(new osgViewer::StatsHandler);
        _viewer->addEventHandler(new osgGA::StateSetManipulator(_viewer->getCamera()->getOrCreateStateSet()));
        _viewer->addEventHandler(new osgViewer::ThreadingHandler);
        _viewer->addEventHandler(new osgViewer::LODScaleHandler);

        _manipulator = new osgGA::KeySwitchMatrixManipulator;

        _manipulator->addMatrixManipulator( '1', "Trackball", new osgGA::TrackballManipulator() );
        _manipulator->addMatrixManipulator( '2', "Flight", new osgGA::FlightManipulator() );
        _manipulator->addMatrixManipulator( '3', "Drive", new osgGA::DriveManipulator() );
        _manipulator->addMatrixManipulator( '4', "Terrain", new osgGA::TerrainManipulator() );
        _manipulator->addMatrixManipulator( '5', "Orbit", new osgGA::OrbitManipulator() );
        _manipulator->addMatrixManipulator( '6', "FirstPerson", new osgGA::FirstPersonManipulator() );
        _manipulator->addMatrixManipulator( '7', "Spherical", new osgGA::SphericalManipulator() );

        _viewer->setCameraManipulator( _manipulator.get() );

        _viewer->getViewerStats()->collectStats("scene", true);

    _viewer->getCamera()->setViewport(0,0,sW, sH);

    _viewer->getCamera()->setClearMask(GL_DEPTH_BUFFER_BIT );

        modelSwitch=new osg::Switch;

        LOG("READING Model_0");
        readModels("/mnt/sdcard/test/0.osg",MODEL_1);

  _root->addChild(modelSwitch.get());

    _viewer->setSceneData(NULL);
    _viewer->setSceneData(_root.get());
    _manipulator->getNode();
    _viewer->home();

    _viewer->getDatabasePager()->clear();
    _viewer->getDatabasePager()->registerPagedLODs(_root.get());
    _viewer->getDatabasePager()->setUpThreads(3, 1);
    _viewer->getDatabasePager()->setTargetMaximumNumberOfPageLOD(2);
    _viewer->getDatabasePager()->setUnrefImageDataAfterApplyPolicy(true, true);

[color=red][b]m_lastStateSet = new osg::StateSet();
 _viewer->getCamera()->getGraphicsContext()->getState()->captureCurrentState (*m_lastStateSet.get()); [/b][/color]

Code:
void OsgApp::renderer(osg::Matrix mat)  
  {

   [color=red] [b]osgState = _viewer->getCamera()->getGraphicsContext()->getState();
    osgState->reset();
    osgState->apply(m_lastStateSet.get()); [/b][/color]

        renderModel_1(mat);

     _viewer->frame();
    [color=red][b]_viewer->getCamera()->getGraphicsContext()->getState()->captu reCurrentState(*m_lastStateSet.get());         [/b] [/color]

  }

...

Thank you!

Cheers,
Koduri

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The error is not with the previous post code.

When I added the following code then the model is displayed.

Code:
 mtForMarker[idx]=new osg::MatrixTransform();

             osg::Shader * vshader = new osg::Shader(osg::Shader::VERTEX, gVertexShader );
            osg::Shader * fshader = new osg::Shader(osg::Shader::FRAGMENT, gFragmentShader );

            osg::Program * prog = new osg::Program;
           prog->addShader ( vshader );
            prog->addShader ( fshader );

            mtForMarker[idx]->getOrCreateStateSet()->setAttribute ( prog );

             mtForMarker[idx]->addChild(loadedModel[idx].get());
             modelSwitch->addChild(mtForMarker[idx].get());

              osgViewer::Viewer::Windows windows;
    _viewer->getWindows(windows);
    for(osgViewer::Viewer::Windows::iterator itr = windows.begin();itr != windows.end();++itr)
    {
      (*itr)->getState()->setUseModelViewAndProjectionUniforms(true);
      (*itr)->getState()->setUseVertexAttributeAliasing(true);
    }

This code I added from osgAndroidOpenGLES2 example.

As I am new to OSG I have two doubts

1) Why should I add the shaders in OpenGLES2 to display model. If I remove this code then the model is not displayed. OpenGLES1 dosnt have this shaders.

2) If I add this code then the textures are not applied to my model. I got  model from 3DS MAX. How can I get textures?

Can you please guide me how to get textures? If shaders are necessary to render model on Android then how can I handle textures (or any others) ? Is there any tutorial to handle this in Android?

...

Thank you!

Cheers,
Koduri

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=51112#51112

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