On Tue, Apr 15, 2008 at 12:46 PM, Art Tevs <[EMAIL PROTECTED]> wrote:
> > OSG manages this by using > > osg::State which maintains a > > stack of StateSet that are currently applied, and > > stacks for the individual > > modes and attributes that are applied. When a > > stateset is popped the > > modes/attributes that were applied by the parent > > StateSet are applied. > This means that the parent StateSet has to contain > some stateattribute which restores the applied state > in the previous state. > No, please read my complete reply. The key part is about what happens when the stack is empty. Please go look at the code in osg::State as well. > > > Ok, I need this behaviour for the following thing: > I am currently preparing a patch for the FBOs and > MRTs. Here I would like to move the glDrawBuffers call > from the RenderStage to the FBO, since I would like to > use FBOs without camera's, hence on its own. This > would be also more general approach, then this one, > which we currently have. > > Now the problem is, that in FrameBufferObject::apply() > method I would like to set the draw buffers > accordingly. However, I have no idea how to restore > the opengl's state back?!?!?! Default constructed FBO?? > > If there would be something like ::disapply() method, > I would be able to restore the drawbuffers by > resetting them to the value as they were before. > > Since there is no such call, I have to set the > drawbuffers to some default value, for which there is > no real default value exists???? > > So any ideas how to manage this? > Arggg, either rely on the default constrcted state attribute mechanism or just place a StateSet above your whole scene. Robert.
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