[osg-users] How to resize when using PIXEL_BUFFER?

[Greg Danaha]

Hi,

Here's a follow-up.  I have it about 95% working (finally!).

Here's my code to resize the pixel-buffer models.


Code:


osg::Camera * camera = m_nhiViewer->getCamera();
if (camera != nullptr)
{
   osg::ref_ptr<osg::GraphicsContext> gc = camera->getGraphicsContext();
   if (gc != nullptr)
   {
      if (gc->releaseContext())
      {
         gc->close(); // will release PixelBufferWin32 and resources

         // create new graphics context
         osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
         traits->x = 0;
         traits->y = 0;
         traits->width = m_width;
         traits->height = m_height;
         traits->red = 8;
         traits->green = 8;
         traits->blue = 8;
         traits->depth = 24;
         traits->pbuffer = true;
         traits->doubleBuffer = true;
         traits->readDISPLAY();
         traits->supportsResize = true;

         gc = osg::GraphicsContext::createGraphicsContext(traits.get());
         if (gc != nullptr)
         {
            gc->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
            gc->setClearColor(m_background);

            camera->setGraphicsContext(gc.get());

            osg::ref_ptr<osg::Image> image = nullptr;
            std::map<osg::Camera::BufferComponent, osg::Camera::Attachment> bam = camera->getBufferAttachmentMap();
            if (!bam.empty())
            {
               osg::Camera::BufferAttachmentMap::iterator iter = bam.find(osg::Camera::COLOR_BUFFER);
               if (iter != bam.end())
                  image = iter->second._image;
            }

            if (image != nullptr)
            {
               image->allocateImage(m_width, m_height, image->r(), 						image->getPixelFormat(), image->getDataType(),
               image->getPacking());
            }

            m_nhiViewer->realize();

            double widthChangeRatio = double(m_width) / double(m_lastWidth);
            double heightChangeRatio = double(m_height) / double(m_lastHeight);
            double aspectRatioChange = widthChangeRatio / heightChangeRatio;

            if (aspectRatioChange != 1.0)
            {
               switch (camera->getProjectionResizePolicy())
               {
                  case(osg::Camera::HORIZONTAL) :
                     camera->getProjectionMatrix() *= osg::Matrix::scale(1.0 / aspectRatioChange, 1.0, 1.0);
                     break;
                  case(osg::Camera::VERTICAL) :
                     camera->getProjectionMatrix() *= osg::Matrix::scale(1.0, aspectRatioChange, 1.0);
                     break;

                  default:
                     break;
               }
            }

            camera->setViewport(0, 0, m_width, m_height);

            double eventTime = m_nhiViewer->getEventQueue()->getTime();
            m_nhiViewer->getEventQueue()->windowResize(0, 0, m_width, m_height, eventTime);
         }
      }
   }
}





But the real problem was that when I set up the rendering when the model loaded, I specified 

camera->setRenderTargetImplementation(osg::Camera::PIXEL_BUFFER);

That seemed to throw everything off.  Now it is defaulting to FRAME_BUFFER and using traits->pbuffer = true; to set up the pixel buffering.

I still have one problem though.  It works great with models (e.g. .flt) but when I resize an earth file it doesn't render properly.  I also get an error 'invalid enumerant' after RenderBin::draw() in osgUtil RenderBin.cpp.  The error value is 1280.  The earth image looks as below after I resize it (or it comes up black).  If I resize it again the globe is black.

Any additional help would be greatly appreciated.

... 

Thank you!

Cheers,
Greg[/code]

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=66275#66275



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