Added blend color to osg::TexEnv

include/osg/TexEnv

@@ -7,6 +7,7 @@
 
 #include <osg/GL>
 #include <osg/StateAttribute>
+#include <osg/Vec4>
 
 namespace osg {
 
@@ -20,7 +21,8 @@ class SG_EXPORT TexEnv : public StateAttribute
         /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
         TexEnv(const TexEnv& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
             StateAttribute(texenv,copyop),
-            _mode(texenv._mode) {}
+            _mode(texenv._mode),
+            _color(texenv._color) {}
 
 
         META_StateAttribute(osg, TexEnv, TEXENV);
@@ -36,6 +38,7 @@ class SG_EXPORT TexEnv : public StateAttribute
 
             // compare each paramter in turn against the rhs.
             COMPARE_StateAttribute_Parameter(_mode)
+            COMPARE_StateAttribute_Parameter(_color)
 
             return 0; // passed all the above comparison macro's, must be equal.
         }
@@ -47,17 +50,25 @@ class SG_EXPORT TexEnv : public StateAttribute
             REPLACE   = GL_REPLACE
         };
 
-        void setMode( const Mode mode );
+        void setMode( const Mode mode ) { _mode = mode; }
         
         const Mode getMode() const { return _mode; }
         
+        void setColor( const Vec4& color ) { _color = color; }
+        
+        Vec4& getColor() { return _color; }
+
+        const Vec4& getColor() const { return _color; }
+
+
         virtual void apply(State& state) const;
 
     protected :
 
         virtual ~TexEnv( void );
 
-        Mode _mode;
+        Mode        _mode;
+        osg::Vec4   _color;
 };
 
 }