1 files changed, 20 insertions, 1 deletions
diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index 3688d58118..d7e79ec655 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -202,9 +202,28 @@ struct pipe_screen {
    void *(*buffer_map)( struct pipe_screen *screen,
 			struct pipe_buffer *buf,
 			unsigned usage );
+   /**
+    * Map a subrange of the buffer data store into the client's address space.
+    *
+    * Return pointer is always relative to offset 0, regardless of the 
+    * read/write ranges.
+    */
+   void *(*buffer_map_range)( struct pipe_screen *screen,
+                              struct pipe_buffer *buf,
+                              unsigned offset,
+                              unsigned length,
+                              unsigned usage);
+
+   /**
+    * written is the range that the client actually wrote. 
+    */
+   void (*buffer_flush_mapped_range)( struct pipe_screen *screen,
+                                      struct pipe_buffer *buf,
+                                      unsigned offset,
+                                      unsigned length);
 
    void (*buffer_unmap)( struct pipe_screen *screen,
-			 struct pipe_buffer *buf );
+                         struct pipe_buffer *buf );
 
    void (*buffer_destroy)( struct pipe_buffer *buf );