--- a/Renderer/Engine/viewer.h	Wed Feb 15 17:45:24 2012 +0900
+++ b/Renderer/Engine/viewer.h	Fri Feb 17 15:34:15 2012 +0900
@@ -10,29 +10,34 @@
 #include "Application.h"
 #include "SceneGraphRoot.h"
 #include "ViewerDevice.h"
+#include "Light.h"
 
 class SceneGraphRoot;
 
 class Application;
 
 
-typedef struct rendering_data {
-    PolygonPack *ppack;
-    SpanPackPtr spackList;
-    SpanPackPtr *spackList_ptr;
-
-    int spackList_length;
-    int spackList_length_align;
-} RenderingData ;
-
-extern RenderingData r[2];
-
-extern int  ppi, spi;
-
 class Viewer : public MainLoop {
 
 public:
-    Viewer(){ profile = 0;};
+    Light *light;
+/* measure for FPS (Frame Per Second) */
+    int start_time;
+    int this_time;
+    int frames;
+
+    typedef struct rendering_data {
+        PolygonPack *ppack;
+        SpanPackPtr spackList;
+        SpanPackPtr *spackList_ptr;
+
+        int spackList_length;
+	int spackList_length_align;
+    } RenderingData ;
+    RenderingData r[2];
+
+    int  ppi, spi;
+    Viewer(){ profile = 0; ppi = spi = 0;};
     Viewer(TaskManager *manager, ViewerDevice *dev, int bpp, int width, int height, int spenum);
 
     virtual ~Viewer() {}
@@ -108,6 +113,8 @@
     // void setSceneData(SceneGraph *g);
     virtual void mainLoop();
 
+    // In Application::init, SceneGraphRoot API is called bia viewer 
+  
     void createStringFont(SceneGraphPtr root, const char *string, int pixels, int screen_w, int screen_h, Uint32 color)
     {
       sgroot -> createStringFont(manager, root, string, pixels, screen_w, screen_h, color);