Hi John,
If you need this to setup uniforms for shadow fragment shaders then maybe
standard GL gl_FrontFacing variable could do the trick ? Its available at least
in GLSL 1.50 and above. I have not checked when it was introduced maybe its
available in earlier GLSL profiles.
Wojtek
From: PCJohn
Sent: Thursday, August 05, 2010 12:41 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] threading and captureCurrentState
Yes. There is. Oh. I see. Sorry for confusion, you call it attribute
stack.... and that is a correct name for it.
Anyway, there is State::_attributeMap that is composed of AttributeStack
structs and they have a member attributeVec that is serving as a stack of
attributes. The top of the stack is "current" attribute or the last pushed
attribute. That is the one I need to get. Until now, I see a threading issue
like two threads manipulating the "attribute stack".
I'll say it again: you can't access those attribute stacks from the cull
traversal. They don't contain anything sensible.
I that case a different question: How to get "current" osg::FrontFace
attribute? I mean the one that would be active for any drawable traversed at
the present moment during cull traversal that is just in progress and I am
handling it in my custom Shadow class that is already working perfectly except
some attribute values that user may pass from the scene graph above and that
need to be properly handled to cast shadows correctly. The answer: "you do not
need it" would be wrong at the moment.
Thx,
John
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