Supply buffer usage hints to winsys.

Winsys driver needs some hints in order to allocate the appropriate kind of
memory for the buffer.

4 files changed, 24 insertions, 10 deletions

diff --git a/src/mesa/pipe/i915simple/i915_prim_vbuf.c b/src/mesa/pipe/i915simple/i915_prim_vbuf.c
index 3632adce790..75ca6d6e5ef 100644
--- a/src/mesa/pipe/i915simple/i915_prim_vbuf.c
+++ b/src/mesa/pipe/i915simple/i915_prim_vbuf.c
@@ -376,7 +376,9 @@ static void vbuf_flush_elements( struct draw_stage *stage )
    /* FIXME: handle failure */
    if(!vbuf->buf)
       vbuf->buf = winsys->buffer_create(winsys, 64);
-   winsys->buffer_data(winsys, vbuf->buf, VBUF_SIZE, NULL);
+   winsys->buffer_data( winsys, vbuf->buf, 
+                        VBUF_SIZE, NULL, 
+                        PIPE_BUFFER_USAGE_VERTEX );
    vbuf->vertex_map = winsys->buffer_map(winsys, 
                                          vbuf->buf, 
                                          PIPE_BUFFER_FLAG_WRITE );
diff --git a/src/mesa/pipe/p_defines.h b/src/mesa/pipe/p_defines.h
index ef79716ed91..119ea1bd775 100644
--- a/src/mesa/pipe/p_defines.h
+++ b/src/mesa/pipe/p_defines.h
@@ -168,15 +168,19 @@
 
 
 /**
- * Buffer flags
+ * Buffer access flags
  */
 #define PIPE_BUFFER_FLAG_READ    0x1
 #define PIPE_BUFFER_FLAG_WRITE   0x2
 
-#define PIPE_BUFFER_USE_TEXTURE         0x1
-#define PIPE_BUFFER_USE_VERTEX_BUFFER   0x2
-#define PIPE_BUFFER_USE_INDEX_BUFFER    0x4
-#define PIPE_BUFFER_USE_RENDER_TARGET   0x8
+
+/**
+ * Buffer usage flags
+ */
+#define PIPE_BUFFER_USAGE_PIXEL    0x1
+#define PIPE_BUFFER_USAGE_VERTEX   0x2
+#define PIPE_BUFFER_USAGE_INDEX    0x4
+#define PIPE_BUFFER_USAGE_CONSTANT 0x8
 
 
 /** 
diff --git a/src/mesa/pipe/p_winsys.h b/src/mesa/pipe/p_winsys.h
index 2d4432dbca4..298b5556515 100644
--- a/src/mesa/pipe/p_winsys.h
+++ b/src/mesa/pipe/p_winsys.h
@@ -116,10 +116,17 @@ struct pipe_winsys
                              struct pipe_buffer_handle **ptr,
                              struct pipe_buffer_handle *buf );
 
-   /** Create the data store of a buffer and optionally initialize it */
+   /** 
+    * Create the data store of a buffer and optionally initialize it.
+    * 
+    * usage is a bitmask of PIPE_BUFFER_USAGE_PIXEL/VERTEX/INDEX/CONSTANT. This
+    * usage argument is only an optimization hint, not a guarantee, therefore 
+    * proper behavior must be observed in all circumstances.
+    */
    void (*buffer_data)(struct pipe_winsys *sws, 
 		       struct pipe_buffer_handle *buf,
-		       unsigned size, const void *data );
+		       unsigned size, const void *data,
+		       unsigned usage);
 
    /** Modify some or all of the data contained in a buffer's data store */
    void (*buffer_subdata)(struct pipe_winsys *sws, 
diff --git a/src/mesa/pipe/xlib/xm_winsys.c b/src/mesa/pipe/xlib/xm_winsys.c
index 5de811a66fa..45ece8ef554 100644
--- a/src/mesa/pipe/xlib/xm_winsys.c
+++ b/src/mesa/pipe/xlib/xm_winsys.c
@@ -120,7 +120,7 @@ xm_buffer_reference(struct pipe_winsys *pws,
 
 static void
 xm_buffer_data(struct pipe_winsys *pws, struct pipe_buffer_handle *buf,
-               unsigned size, const void *data )
+               unsigned size, const void *data, unsigned usage )
 {
    struct xm_buffer *xm_buf = xm_bo(buf);
    assert(!xm_buf->userBuffer);
@@ -245,7 +245,8 @@ xm_region_alloc(struct pipe_winsys *winsys,
    winsys->buffer_data( winsys,
                         region->buffer, 
                         region->pitch * cpp * height, 
-                        NULL );
+                        NULL,
+                        PIPE_BUFFER_USAGE_PIXEL );
    return region;
 }