gallium/u_upload: add u_upload_clone

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

src/gallium/auxiliary/util/u_upload_mgr.c

@@ -97,6 +97,13 @@ u_upload_create_default(struct pipe_context *pipe)
                           PIPE_USAGE_STREAM);
 }
 
+struct u_upload_mgr *
+u_upload_clone(struct pipe_context *pipe, struct u_upload_mgr *upload)
+{
+   return u_upload_create(pipe, upload->default_size, upload->bind,
+                          upload->usage);
+}
+
 static void upload_unmap_internal(struct u_upload_mgr *upload, boolean destroying)
 {
    if (!destroying && upload->map_persistent)

src/gallium/auxiliary/util/u_upload_mgr.h

@@ -61,6 +61,13 @@ u_upload_create(struct pipe_context *pipe, unsigned default_size,
 struct u_upload_mgr *
 u_upload_create_default(struct pipe_context *pipe);
 
+/**
+ * Create an uploader with identical parameters as another one, but using
+ * the given pipe_context instead.
+ */
+struct u_upload_mgr *
+u_upload_clone(struct pipe_context *pipe, struct u_upload_mgr *upload);
+
 /**
  * Destroy the upload manager.
  */