Shader::get* return NULL when RenderStateSet is NULL.
Shader::get* return NULL when RenderStateSet is NULL.
MicBosi/visualizationlibrary,Wulfire/visualizationlibrary,Wulfire/visualizationlibrary,MicBosi/visualizationlibrary,Wulfire/visualizationlibrary,MicBosi/visualizationlibrary