Ok I was able to get it working by getting the resolved fbo using the
RenderStage::getMultisampleResolveFramebufferObject method. Here a subset of
my code in the draw callback:
osgViewer::Renderer * renderer =
static_cast<osgViewer::Renderer*>(renderInfo.getCurrentCamera()->getRenderer());
osg::FrameBufferObject *fbo=NULL;
fbo=renderer->getSceneView(0)->getRenderStage()->getMultisampleResolveFramebufferObject();
// Bind the fbo to be read
fbo->apply(state,osg::FrameBufferObject::READ_FRAMEBUFFER);
// Specify a color buffer as the source for the subsequent call of
glReadPixel
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
float* tempbuf32Bits = new float[WIDTH*HEIGHT];
glReadPixels(0, 0, WIDTH, HEIGHT, GL_RED, GL_FLOAT, tempbuf32Bits);
Thanks you
Jonathan
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