Added support for glLineWidth via an osg::LineWidth StateAttribute.

include/osg/LineWidth

@@ -0,0 +1,50 @@
+//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_LineWidth
+#define OSG_LineWidth 1
+
+#include <osg/StateAttribute>
+#include <osg/StateSet>
+
+namespace osg {
+
+/** LineWidth - encapsulates the OpenGL glLineWidth for setting the width of lines in pixels.*/
+class SG_EXPORT LineWidth : public StateAttribute
+{
+    public :
+
+        LineWidth();
+
+        META_StateAttribute(LineWidth, LINEWIDTH);
+        
+        /** 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(LineWidth,sa)
+
+            // compare each paramter in turn against the rhs.
+            COMPARE_StateAttribute_Parameter(_width)
+
+            return 0; // passed all the above comparison macro's, must be equal.
+        }
+
+        void setWidth(const float width);
+        inline const float getWidth() const { return _width; }
+
+        virtual void apply(State& state) const;
+
+    protected :
+
+        virtual ~LineWidth();
+
+        float       _width;
+
+};
+
+};
+
+#endif

include/osg/StateAttribute

@@ -120,9 +120,10 @@ class SG_EXPORT StateAttribute : public Object
             LIGHT_5         =LIGHT+1,
             LIGHT_6         =LIGHT+1,
             LIGHT_7         =LIGHT+1,
-            POINT           =LIGHT_7+1,
-            
-            POLYGONMODE     =POINT+1,
+
+            POINT           =LIGHT_7+1,            
+            LINEWIDTH       =POINT+1,
+            POLYGONMODE     =LINEWIDTH+1,
             POLYGONOFFSET   =POLYGONMODE+1,
             TEXENV          =POLYGONOFFSET+1,
             TEXGEN          =TEXENV+1,