[osg-users] Disappearing text

[Robert Osfield]

Hi Ronny,

Where the problem lies will likely be how you are managing the viewer as
well as the graphics context.  My hunch is that you've created the problem
with your "custom" means of managing things.

If you can try running your application with a straight osgViewer::Viewer
with it creating a single window for you rather than hand wiring things
yourself, even if this doesn't give you exactly what you want for your
final application it will at least give you a sanity test to compare
results against.  If this works then you know that the issue stems from
your won custom set up.

While it possible to hand wire things up it's more complicated with more
options for screwing things up if your don't know how all the various
elements fully work together.

Robert.



On 18 April 2016 at 16:30, Ronny Hatteland <ronnyhatteland at gmail.com> wrote:

>
> > That should not be needed at all, and indicative that something
> somewhere in your application or it's usage of the OSG is messing up the GL
> object management.
> >
> >
> > The resizeGLObjbectBuffer() is only needed when graphics context are
> created or destroyed.
> >
> >
> >
> > As to what is going wrong your case I can't say - something *very* odd
> is happening.  Are you creating your own graphics context / modifying the
> viewer?
> >
> >
> > Robert.
>
>
> Yes I am creating my own GraphicsContext:
>
> Code:
> // Local Variable to hold window size data
> RECT rect;
>
> // Get the current window size
> ::GetWindowRect(m_hWnd, &rect);
>
> // Init the GraphicsContext Traits
> osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
> osg::GraphicsContext::Traits;
>
> // Init the Windata Variable that holds the handle for the Window to
> display OSG in.
> osg::ref_ptr<osg::Referenced> windata = new
> osgViewer::GraphicsWindowWin32::WindowData(m_hWnd);
>
> // Setup the traits parameters
> traits->x = 0;
> traits->y = 0;
> traits->width = (rect.right - rect.left);
> traits->height = ( rect.bottom - rect.top);
>
> traits->windowDecoration = true; // CHECK DIFFERENCE
> traits->doubleBuffer = false;
> traits->setInheritedWindowPixelFormat = true;
> traits->inheritedWindowData = windata;
> traits->samples = samples;
> traits->vsync = false;
> GraphicsContext* gc =
> osg::GraphicsContext::createGraphicsContext(traits.get());
> traits->x = 0;
> traits->y = 0;
> return gc;
>
>
> which afterwards is used as follows:
>
>
> Code:
> m_defaultGraphicsContext->clear();
>
> m_defaultGraphicsContext->setName("DefaultViewGraphicsContext");
> m_defaultGraphicsContext->getState()->setUseModelViewAndProjectionUniforms(true);
> //ADDED FOR SHADER
> m_defaultGraphicsContext->getState()->setUseVertexAttributeAliasing(true);
>
> if (m_defaultGraphicsContext->valid())
> {
>         defaultCamera = mViewer->getCamera();
>         defaultCamera->setCullMask(0x04);
>         defaultCamera->getOrCreateStateSet()->setMode(GL_LIGHTING,
> osg::StateAttribute::OFF );
>
> defaultCamera->getOrCreateStateSet()->setMode(osg::StateAttribute::SCISSOR
> , osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
>
> defaultCamera->getOrCreateStateSet()->removeAttribute(osg::StateAttribute::MATERIAL);
>         defaultCamera->getView()->setLightingMode(osg::View::NO_LIGHT);
>         defaultCamera->setGraphicsContext(m_defaultGraphicsContext);
>         defaultCamera->setViewport(new
> osg::Viewport(m_defaultGraphicsContext->getTraits()->x,
> m_defaultGraphicsContext->getTraits()->y,
> m_defaultGraphicsContext->getTraits()->width,
> m_defaultGraphicsContext->getTraits()->height));
> }
>
> double fovy, aspectRatio;
>
> mViewer->getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio,
> defaultCameraNear, defaultCameraFar);
> aspectRatio = double(m_defaultGraphicsContext->getTraits()->width) /
> double(m_defaultGraphicsContext->getTraits()->height);
> mViewer->getCamera()->setProjectionMatrixAsPerspective(fovy, aspectRatio,
> 0.0000000001f, defaultCameraFar);
>
> initOpenGL(m_defaultGraphicsContext, maxNumUniforms, maxUniformBlockSize);
>
>
>
>
> Code:
>
> void initOpenGL(osg::ref_ptr<osg::GraphicsContext> context, GLint&
> maxNumUniforms, GLint& maxUniformBlockSize) {
>         context->realize();
>         context->makeCurrent();
>         maxNumUniforms = 0;
>         glGetIntegerv(GL_MAX_VERTEX_UNIFORM_COMPONENTS, &maxNumUniforms);
>         maxUniformBlockSize = 0;
>         glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &maxUniformBlockSize);
>
>         // init glew
>         ///glewExperimental = GL_TRUE;
>         /// if (GLEW_ARB_vertex_buffer_object == FALSE ||
> GLEW_ARB_vertex_array_object == FALSE) return;
> #ifdef USE_INSTANCED_DRAWING
>         glewInit();
> #endif
>         context->releaseContext();
>
>         // ATI driver 11.6 didn't return right number of uniforms which
> lead to a crash, when the vertex shader was compiled(WTF?!)
> #ifdef ATI_FIX
>         maxNumUniforms      = 576;
>         maxUniformBlockSize = 16384;
> #endif
> }
>
>
>
> Maybe you can spot something that is clearly wrong here, otherwise it
> could be related to the glewInit()?
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=66864#66864
>
>
>
>
>
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>
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