Hi Brett,
State::pushStateSet()/popStateSet() is not equivilant to
glPushAttrib/glPopAttrib() son't can't be used in place. There are
several haveApplied*() methods in osg::State that can be used to pass
declare certain state dirty, and this is the most efficient way to do
things, but... it does require you to know what state has been
applied, and if its a black box then you won't know and
glPushAttribute/glPopAttrib() will have to be used, and most probably
the client state will need to be pushed and popped as well.
Robert.
On Feb 20, 2008 7:22 PM, Brett Wiesner <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I have a custom drawable that makes calls to some openGL code in the
> drawImplementation() method (much like the osgTeapot example).
>
> The code is from a 3rd party vendor and they obviously make calls that
> change some openGL attributes because things like the stats handler stop
> working after this drawable is added to the scene.
>
> I've fixed the problem by pushing/ poping the openGL attributes like so:
>
> MyDrawable::drawImplementation( osg::RenderInfo& ri) const
> {
> glPushAttrib(GL_ALL_ATTRIB_BITS);
>
> // do third party drawing code
>
> glPopAttrib();
> }
>
> I have two questions. First, is there a way to use osg::state to do
> this? Would this work?
>
> MyDrawable::drawImplementation( osg::RenderInfo& ri) const
> {
> osg::state* state = ri.getState();
> state->pushStateSet(getStateSet());
>
> // do third party drawing code
>
> state->popStateSet();
> }
>
> Second, if I could figure out what attributes the 3rd party code sets,
> would I be better off setting the stateSet of the drawable in the CTOR?
>
> Thanks,
> Brett
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>
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