--- a/Renderer/Engine/viewerSDL.cc	Fri Oct 01 00:37:06 2010 +0900
+++ b/Renderer/Engine/viewerSDL.cc	Fri Oct 01 01:25:45 2010 +0900
@@ -3,6 +3,8 @@
 #include "TaskManager.h"
 #include "viewer_types.h"
 
+#define UGA 1
+
 extern void post2runLoop(void *);
 
 #define default_sdl_flag SDL_INIT_TIMER | SDL_INIT_JOYSTICK
@@ -21,7 +23,7 @@
 	exit(1);
     }
 
-    screen = SDL_SetVideoMode(width, height, bpp, SDL_SWSURFACE);
+    screen = SDL_SetVideoMode(width, height, bpp, SDL_HWSURFACE);
     if (screen == NULL) {
 	fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
 	SDL_Quit();
@@ -45,14 +47,28 @@
 ViewerSDL::clean_pixels()
 {
     //bzero(pixels, sizeof(int)*width*height);
+#if !UGA
     SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,0));
+#endif
 }
 
 void
 ViewerSDL::clear_screen()
 {
+#if !UGA
     SDL_BlitSurface(bitmap, NULL, screen, NULL);
     SDL_UpdateRect(screen, 0, 0, 0, 0);        
+#endif
+}
+
+uint32_t *
+ViewerSDL::flip_screen(uint32_t *old)
+{
+#if UGA
+    SDL_BlitSurface(bitmap,NULL,screen,NULL);
+    SDL_UpdateRect(screen,0,0,0,0);
+#endif
+    return old;
 }
 
 void