Added missing include/osg/ClearNode

include/osg/ClearNode

@@ -0,0 +1,59 @@
+//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
+//Distributed under the terms of the GNU Library General Public License (LGPL)
+//as published by the Free Software Foundation.
+
+#ifndef OSG_CLEARNODE
+#define OSG_CLEARNODE 1
+
+#include <osg/Group>
+#include <osg/Vec4>
+
+namespace osg {
+
+/** ClearNode is a Group node which controls the clearing of the color and depth
+  * buffers at the start of each frame.
+  * The earth sky by default is empty and simply holds the clear color of
+  * the background. However, if the uses wants to add their own clearing of
+  * the color and depth buffers then the children can be added, and the
+  * background clear turned off. The ClearNode by default has StateSet attached
+  * to it which sets the default ClearNode bin number to -1, so that all drawables
+  * below it are placed in a separate bin from the rest of the scene graph, and
+  * are rendered prior to standard opaque and transparent drawables.
+*/
+class SG_EXPORT ClearNode : public Group
+{
+    public :
+        
+        ClearNode();
+
+        ClearNode(const ClearNode& es, const CopyOp& copyop=CopyOp::SHALLOW_COPY):
+            Group(es,copyop),
+            _requiresClear(es._requiresClear),
+            _clearColor(es._clearColor) {}  
+
+
+        META_Node(osg, ClearNode);
+
+	/** Sets the flag which control whether a glClear is required at the beginning of each frame. */
+        inline void setRequiresClear(const bool requiresClear) { _requiresClear = requiresClear; }
+
+	/** Gets the flag which control whether a glClear is required at the beginning of each frame. */
+        inline const bool getRequiresClear() const { return _requiresClear; }
+
+	/** Sets the clear color. */
+        inline void setClearColor(const Vec4& color) { _clearColor = color; }
+
+	/** Returns the clear color. */
+        inline const Vec4& getClearColor() const { return _clearColor; }
+
+    protected :
+    
+        virtual ~ClearNode() {}
+        
+        bool _requiresClear;
+        Vec4 _clearColor;  
+};
+
+}
+
+#endif