More clean up for synch with 0.8.42

include/osg/Depth

@@ -0,0 +1,75 @@
+#ifndef OSG_DEPTH
+#define OSG_DEPTH 1
+
+#include <osg/StateAttribute>
+#include <osg/StateSet>
+#include <osg/Types>
+
+namespace osg {
+
+/** Encapsulte OpenGL glDepthFunc/Mask/Range functions.
+*/     
+class SG_EXPORT Depth : public StateAttribute
+{
+    public :
+    
+    
+        Depth();
+        virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const Depth*>(obj)!=0L; }
+        virtual Object* clone() const { return new Depth(); }
+        virtual const char* className() const { return "Depth"; }
+    
+        virtual const Type getType() const { return DEPTH; }
+        
+        virtual void setStateSetModes(StateSet& ds,const GLModeValue value) const
+        {
+            ds.setMode(GL_DEPTH_TEST,value);
+        }
+
+        enum Function
+        {
+            NEVER = GL_NEVER,
+            LESS = GL_LESS,
+            EQUAL = GL_EQUAL,
+            LEQUAL = GL_LEQUAL,
+            GREATER = GL_GREATER,
+            NOTEQUAL = GL_NOTEQUAL,
+            GEQUAL = GL_GEQUAL,
+            ALWAYS = GL_ALWAYS
+        };
+
+        inline void setFunction(const Function func) { _func = func; }
+        
+        inline const Function getFunction() const { return _func; }
+               
+
+        inline void setWriteMask(const bool mask) { _depthWriteMask = mask; }
+        
+        inline const bool getWriteMask() const { return _depthWriteMask; }
+
+        inline void setRange(const double zNear, const double zFar)
+        {
+            _zNear = zNear;
+            _zFar = zFar;
+        }
+
+        inline const double getZNear() const { return _zNear; }
+        inline const double getZFar() const { return _zFar; }
+
+        virtual void apply(State& state) const;
+
+    protected:
+    
+        virtual ~Depth();
+
+        Function            _func;
+        bool                _depthWriteMask;
+        
+        double              _zNear;
+        double              _zFar;
+
+};
+
+};
+
+#endif