Happy Friday everyone.
Forgive me if this turns out to be a terribly trivial problem. I'm still a
rookie with GL/OSG/graphics in general.
I'm attempting to get a two camera system set up, one RTT. I'm attempting to
read the texture back into an unsigned char array during a callback each frame.
My scene graph is set up such that I have:
Code:
viewer
|_ setSceneData()
|_topNode(osg::Group)
|_FBOCamera(set to prerender)
|_SceneRoot(osg::Group)
I don't have any nodes added under the viewer's main camera currently.
The setup for my FBOCamera is:
Code:
primaryCamera->setFinalDrawCallback(new
FBOFinalRenderCallback(renderTexture));
FBOCamera->setClearColor(Vec4f(1., 1., 1., 1.));
FBOCamera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
FBOCamera->setViewport(0, 0, WIDTH, HEIGHT);
//FBOCamera->setViewMatrixAsLookAt(Vec3d(0., 0., 0.), Vec3d(0., 1., 0.),
Vec3d(0., 0., 1.));
FBOCamera->setViewMatrix(Matrixd::identity());
//FBOCamera->setProjectionMatrixAsPerspective(60.,
(double)WIDTH/(double)HEIGHT, NEAR, FAR);
FBOCamera->setProjectionMatrix(Matrixd::identity());
FBOCamera->setRenderOrder(Camera::PRE_RENDER);
FBOCamera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
FBOCamera->attach(Camera::BufferComponent(Camera::COLOR_BUFFER),
renderTexture);
The setup for my texture is:
Code:
StateSet *stateSet = topNode->getOrCreateStateSet();
stateSet->setTextureAttributeAndModes(FBO_RENDER_TEXTURE_UNIT,
renderTexture, StateAttribute::ON);
renderTexture->setTextureSize(WIDTH, HEIGHT);
renderTexture->setSourceFormat(GL_RGBA);
renderTexture->setInternalFormat(GL_RGBA8UI);
renderTexture->setSourceType(GL_UNSIGNED_BYTE);
renderTexture->setFilter(Texture2D::MIN_FILTER, Texture2D::NEAREST);
renderTexture->setFilter(Texture2D::MAG_FILTER, Texture2D::NEAREST);
renderTexture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
renderTexture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
renderTexture->setWrap(Texture::WRAP_R, Texture::CLAMP_TO_EDGE);
My callback gets a ref_ptr to the texture. Then each frame it:
Code:
glBindTexture(GL_TEXTURE_RECTANGLE, FBO_RENDER_TEXTURE_UNIT);
glGetTexImage(renderTexture->getTextureTarget(),
0,
renderTexture->getInternalFormat(),
renderTexture->getSourceType(),
data);
glBindTexture(GL_TEXTURE_RECTANGLE, 0);
PostCallbackValidateData(); // prints all the values in data to the console
When I print data to the screen, all I get are the values I initially populated
data with. I never even get the clear color for the camera. What I've written
looks right when compared to other things I've seen done. What am I missing
here?
(As an aside: am I right in calling FBOCamera that? I presume that by setting
the camera to RTT, it's got to be using an FBO's GL_COLOR_BUFFER behind the
scenes, even if I don't explicitly generate the FBO.. I don't know of any
other way to RTT..)
Thanks all.
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=40069#40069
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