added ambient_occlusion global scene option to parser and vim keywords; added ambient_occlusion scene file

git-svn-id: svn://anubis/fart/trunk@263 7f9b0f55-74a9-4bce-be96-3c2cd072584d

parser/nodes.h

@@ -68,6 +68,12 @@ class AmbientNode : public VectorNode
         AmbientNode(refptr<Vector> vector) : VectorNode(vector) {}
 };
 
+class AmbientOcclusionNode : public IntegerNode
+{
+    public:
+        AmbientOcclusionNode(int i) : IntegerNode(i) {}
+};
+
 class BoxNode : public Node
 {
     public:

parser/parser.lex

@@ -40,6 +40,7 @@
 -?[0-9]*\.[0-9]+    *yylval = new NumberNode(atof(yytext)); return REAL_NUMBER;
 
 ambient             return AMBIENT;
+ambient_occlusion   return AMBIENT_OCCLUSION;
 box                 return BOX;
 camera              return CAMERA;
 color               return COLOR;

parser/parser.yy

@@ -59,6 +59,7 @@ static refptr<Node> parsed_scene_node;
 %token REAL_NUMBER;
 
 %token AMBIENT;
+%token AMBIENT_OCCLUSION;
 %token BOX;
 %token CAMERA;
 %token COLOR;
@@ -314,6 +315,9 @@ options_item: WIDTH DEC_NUMBER {
             | AMBIENT vector {
                     $$ = new AmbientNode($2->getVector());
                 }
+            | AMBIENT_OCCLUSION DEC_NUMBER {
+                    $$ = new AmbientOcclusionNode($2->getInteger());
+                }
             ;
 
 plane: PLANE LCURLY plane_items RCURLY {