Added support for osg_FrameNumber, osg_FrameTime, osg_ViewMatrix, osg_InverseViewMatrix

into SceneView, controlled via a setActiveUniforms(.) method.

src/osg/StateSet.cpp

@@ -923,6 +923,25 @@ Uniform* StateSet::getUniform(const std::string& name)
     else return 0;
 }
 
+Uniform* StateSet::getOrCreateUniform(const std::string& name, Uniform::Type type)
+{
+    // for look for an appropriate uniform.
+    UniformList::iterator itr = _uniformList.find(name);
+    if (itr!=_uniformList.end() && 
+        itr->second.first->getType()==type)
+    {
+        return itr->second.first.get();
+    }
+
+    // no uniform found matching name so create it..
+    
+    Uniform* uniform = new Uniform(name,type);
+    addUniform(uniform);
+    
+    return uniform;
+}
+
+
 const Uniform* StateSet::getUniform(const std::string& name) const
 {
     UniformList::const_iterator itr = _uniformList.find(name);

src/osg/Uniform.cpp

@@ -34,7 +34,7 @@ Uniform::Uniform() :
 }
 
 
-Uniform::Uniform( const char* name, Type type ) :
+Uniform::Uniform( const std::string& name, Type type ) :
     _name(name), _type(type),_modifiedCount(0)
 {
     setDataVariance(STATIC);
@@ -89,6 +89,8 @@ void Uniform::removeParent(osg::StateSet* object)
 
 bool Uniform::setType( Type t )
 {
+    if (_type==t) return true;
+
     if( _type != UNDEFINED )
     {
         osg::notify(osg::WARN) << "cannot change Uniform type" << std::endl;
@@ -721,6 +723,7 @@ bool Uniform::get( bool& b0, bool& b1, bool& b2, bool& b3 ) const
 
 void Uniform::apply(const GL2Extensions* ext, GLint location) const
 {
+    // osg::notify(osg::NOTICE) << "uniform at "<<location<<" "<<_name<< std::endl;
     switch( getGlApiType(getType()) )
     {
     case FLOAT: