document flags param to region_alloc()

diff --git a/src/mesa/pipe/p_winsys.h b/src/mesa/pipe/p_winsys.h
index 298b555..5bc6e64 100644 (file)
--- a/src/mesa/pipe/p_winsys.h
+++ b/src/mesa/pipe/p_winsys.h
@@ -72,6 +72,9 @@ struct pipe_winsys
                   const char *, ... ); 
 
 
+   /**
+    * flags is bitmask of PIPE_SURFACE_FLAG_RENDER, PIPE_SURFACE_FLAG_TEXTURE
+    */
    struct pipe_region *(*region_alloc)(struct pipe_winsys *ws,
                                        unsigned cpp, unsigned width,
                                        unsigned height, unsigned flags);