On 9.8.2015 17:04, BjXXrn Blissing wrote:
Hi Robert,
Well, I was hoping to be able to do the integration without modifications to
OSG. If such modifications proves to be necessary, then I agree with Jan that
we should wait for v0.7 to see if that integration is easier. It seems
unnecessary to change OSG for a problem that may disappear in later Oculus SDK
versions.
But I am happy to report that I have a working, flicker free solution. Although
I had to make a rather cumbersome call inside my pre draw camera callback to
get the FBO handle:
Code:
osg::Camera* camera = renderInfo.getCurrentCamera();
osgViewer::Renderer *camRenderer =
(dynamic_cast<osgViewer::Renderer*>(camera->getRenderer()));
if (camRenderer != NULL) {
osgUtil::SceneView* sceneView = camRenderer->getSceneView(0);
if (sceneView != NULL) {
osgUtil::RenderStage* renderStage = sceneView->getRenderStage();
if (renderStage != NULL) {
osg::FrameBufferObject* fbo = renderStage->getFrameBufferObject();
GLuint fboHandle = fbo->getHandle(ctx);
}
}
}
This also forced me to link with osgUtil. I don't know if there is a simpler
way of getting the FBO handle, which does not involve osgUtil?
Best regards
Björn
Hi Björn,
If you need low level manipulation of the FBO, it migh be best to simply create
one that is fully independent/transparent to the osg (as opposed to fully
automated high-level camera attachment). Having said that, you could simply
create new FBO, in let's say, CustomCamera constructor:
CustomCamera::CustomCamera()
{
//usual camera setup for rtt
//...
osg::Texture2D* texture = createTexture();
//attach(osg::Camera::COLOR_BUFFER, texture);
_fbo = new osg::FrameBufferObject;
_fbo->setAttachment(osg::Camera::COLOR_BUFFER,
osg::FrameBufferAttachment(texture));
setPreDrawCallback(new BindFboPreDrawCallback(_fbo.get()));
setPostDrawCallback(new UnBindFboPostDrawCallback);
}
class BindFboPreDrawCallback : public osg::Camera::DrawCallback
{
public:
BindFboPreDrawCallback(osg::FrameBufferObject* fbo) : _fbo(fbo) {}
virtual void operator () (osg::RenderInfo& renderInfo) const
{
_fbo->apply(*renderInfo.getState()); //bind FBO
}
protected:
osg::ref_ptr<osg::FrameBufferObject> _fbo;
};
class UnBindFboPostDrawCallback : public osg::Camera::DrawCallback
{
public:
virtual void operator () (osg::RenderInfo& renderInfo) const
{
renderInfo.getState()->get<osg::GLExtensions>()->glBindFramebuffer(osg::FrameBufferObject::READ_DRAW_FRAMEBUFFER,
0);
}
};
You can the manipulate CustomCamera's owned fbo or reattach textures at any
suitable stage ...
P.S.: You may also need to call _fbo->resizeGLObjectBuffers(maxSize) and
_fbo->releaseGLObjects(state) when appropriate.
Best Regards,
Robert Milharcic
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