Added support for glLineStipple via osg::LineStipple state attribute.

include/osg/LineStipple

@@ -0,0 +1,67 @@
+//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
+//Distributed under the terms of the GNU Library General Public License (LGPL)
+//as published by the Free Software Foundation.
+
+#ifndef OSG_LINESTIPPLE
+#define OSG_LINESTIPPLE 1
+
+#include <osg/StateAttribute>
+#include <osg/StateSet>
+
+namespace osg {
+
+class SG_EXPORT LineStipple : public StateAttribute
+{
+    public :
+
+        LineStipple();
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
+        LineStipple(const LineStipple& lw,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
+          StateAttribute(lw,copyop),
+          _factor(lw._factor),
+          _pattern(lw._pattern) {}
+
+        META_StateAttribute(LineStipple, LINESTIPPLE);
+
+        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
+        virtual int compare(const StateAttribute& sa) const
+        {
+            // check the types are equal and then create the rhs variable
+            // used by the COMPARE_StateAttribute_Paramter macro's below.
+            COMPARE_StateAttribute_Types(LineStipple,sa)
+
+            // compare each paramter in turn against the rhs.
+            COMPARE_StateAttribute_Parameter(_factor)
+            COMPARE_StateAttribute_Parameter(_pattern)
+
+            return 0; // passed all the above comparison macro's, must be equal.
+        }
+        
+        virtual void setStateSetModes(StateSet& ds,const GLModeValue value) const
+        {
+            ds.setMode(GL_LINE_STIPPLE,value);
+        }
+
+
+        void setFactor(const int factor);
+        inline const int getFactor() const { return _factor; }
+
+        void setPattern(const unsigned short pattern);
+        inline const unsigned short getPattern() const { return _pattern; }
+
+        virtual void apply(State& state) const;
+
+
+    protected :
+
+        virtual ~LineStipple();
+
+        int			_factor;
+        unsigned short	        _pattern;
+
+};
+
+}
+
+#endif

include/osg/StateAttribute

@@ -124,6 +124,7 @@ class SG_EXPORT StateAttribute : public Object
 
             POINT,
             LINEWIDTH,
+            LINESTIPPLE,
             SHADEMODEL,
             POLYGONMODE,
             POLYGONOFFSET,