Hi All, I have now checked in core OSG support for a new form of shader composition that leverages #pragma's to extended GLSL shaders to specify which #define's that it requires from the scene graph. The scene graph passes these to the shaders via StateSet::setDefine(..) and provides full support for the OSG's state override/protected options.
I have modified the osgshadercomposition example to illustrate a very simple example that utlizes three shaders checked into OpenSceneGraph-Data/shaders trunk. So on the code look for OpenSceneGraph/examples/osgshadercomposition.cpp and on the shader from look at OpenSceneGraph-Data/shaders/osgshadercompostion.vert, osgshadercomposition.frag and lighting.vert. I will write more later about how to use this new capability. It's gotta be one of the coolest features added to the OSG for quite a few years :-) Cheers, Robert.
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