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-rw-r--r--src/gallium/include/pipe/p_screen.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index ed3a026023..ceac755e71 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -223,6 +223,13 @@ struct pipe_screen {
* specified to buffer_map_range. This is different from the
* ARB_map_buffer_range semantics because we don't forbid multiple mappings
* of the same buffer (yet).
+ *
+ * If the buffer was mapped for writing and no buffer_flush_mapped_range
+ * call was done until the buffer_unmap is called then the pipe driver will
+ * assumed that the whole buffer was written. This is for backward
+ * compatibility purposes and may affect performance -- the state tracker
+ * should always specify exactly what got written while the buffer was
+ * mapped.
*/
void (*buffer_flush_mapped_range)( struct pipe_screen *screen,
struct pipe_buffer *buf,