added "refraction" to parser, added RefractionNode node type

git-svn-id: svn://anubis/fart/trunk@373 7f9b0f55-74a9-4bce-be96-3c2cd072584d

parser/nodes.h

@@ -410,6 +410,16 @@ class ReflectanceNode : public NumberNode
         }
 };
 
+class RefractionNode : public NumberNode
+{
+    public:
+        RefractionNode(NodeRef e) : NumberNode(e) {}
+        virtual NodeRef evaluate()
+        {
+            return new RefractionNode(m_expr->evaluate());
+        }
+};
+
 class RotateNode : public VectorNode
 {
     public:

parser/parser.lex

@@ -76,6 +76,7 @@ polygon             return POLYGON;
 position            return POSITION;
 radius              return RADIUS;
 reflectance         return REFLECTANCE;
+refraction          return REFRACTION;
 rotate              return ROTATE;
 scale               return SCALE;
 scene               return SCENE;

parser/parser.yy

@@ -94,6 +94,7 @@ refptr<Scope> parser_scope;
 %token POSITION;
 %token RADIUS;
 %token REFLECTANCE;
+%token REFRACTION;
 %token ROTATE;
 %token SCALE;
 %token SCENE;
@@ -197,6 +198,7 @@ general_item: AMBIENT vector3 { $$ = new AmbientNode($2); }
             }
             | RADIUS expression { $$ = new RadiusNode($2); }
             | REFLECTANCE expression { $$ = new ReflectanceNode($2); }
+            | REFRACTION expression { $$ = new RefractionNode($2); }
             | ROTATE expression COMMA vector3 { $$ = new RotateNode($2, $4); }
             | SCALE expression { $$ = new ScaleNode(new ScaleScalarNode($2)); }
             | SCALE vector2 { $$ = new ScaleNode($2); }