Hi,
I have somewhat similar questions to recent FBO question,
but not quite, so I would ask in a new thread.
I try to extend Blender with osg rendering ( just because osg does many
things better than Blender namely I use osgPango to render dynamically
text).
First - it is fairly easy to create in osg app pbuffer
by
setting
traits->pbuffer = true;
and then
osg::ref_ptr<osg::GraphicsContext> pbuffer =
osg::GraphicsContext::createGraphicsContext(traits.get());
if (pbuffer.valid())
{
osg::notify(osg::NOTICE)<<"Pixel buffer has been created
successfully."<<std::endl;
osg::ref_ptr<osg::Camera> camera =
createOrthoCamera(WINDOW_WIDTH, WINDOW_HEIGHT);
camera->setGraphicsContext(pbuffer.get());
osg::GraphicsContext* context = camera->getGraphicsContext();
camera->setViewport(new
osg::Viewport(0,0,WINDOW_WIDTH/*traits->width*/,WINDOW_HEIGHT/*traits->height*/));
GLenum buffer = pbuffer->getTraits()->doubleBuffer ? GL_BACK :
GL_FRONT;
camera->setDrawBuffer(buffer);
camera->setReadBuffer(buffer);
viewer.setCamera(camera.get());
}
set viewer data,
set render callback
and make it viewer.renderingTraversals(); to perform rendering once.
after which it is possible to read glReadPixels and apply them as texture.
Obviously, Blender has another context and
osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();
traits->width = WINDOW_WIDTH;
traits->height = WINDOW_HEIGHT;
traits->pbuffer = true;
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new
osg::GraphicsContext::Traits(ds);
osg::ref_ptr<osg::GraphicsContext> pbuffer =
osg::GraphicsContext::createGraphicsContext(traits.get());
causes subsequent attachment to blender texture to fail.
I tried to notify pbuffer traits with
traits->setInheritedWindowPixelFormat = true;
osg::ref_ptr<osgViewer::GraphicsWindowWin32::WindowData> wdata = new
osgViewer::GraphicsWindowWin32::WindowData( GetActiveWindow(),false );
traits->inheritedWindowData = wdata.get();
but to no avail - I still have problems ( and BTW I found that code in
windows pbuffer won't use inherited data - it will created temporary
window).
so the question is - if I use osg to render to pbuffer in complex OpenGL
application, how to make that contexts problems does not occur?
I seen in replies for osg/OpenGL apps integration that FrameBuffer ( pbuffer
) is easiest way to go.
but in my case I did not got working solution.
so what should be changed to get rendering to pbuffer with osg in outside
app ( even if it requires to make changes in core osg - what - to get rid of
makecurrent or instead keep track of makecurrent etc?).
Best regards
Sergey
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