2 files changed, 31 insertions, 0 deletions
diff --git a/src/mesa/main/hash.c b/src/mesa/main/hash.c
index 6591af9a69a..b31fd483906 100644
--- a/src/mesa/main/hash.c
+++ b/src/mesa/main/hash.c
@@ -302,6 +302,34 @@ _mesa_HashDeleteAll(struct _mesa_HashTable *table,
 
 
 /**
+ * Clone all entries in a hash table, into a new table.
+ *
+ * \param table  the hash table to clone
+ */
+struct _mesa_HashTable *
+_mesa_HashClone(const struct _mesa_HashTable *table)
+{
+   /* cast-away const */
+   struct _mesa_HashTable *table2 = (struct _mesa_HashTable *) table;
+   struct hash_entry *entry;
+   struct _mesa_HashTable *clonetable;
+
+   ASSERT(table);
+   _glthread_LOCK_MUTEX(table2->Mutex);
+
+   clonetable = _mesa_NewHashTable();
+   assert(clonetable);
+   hash_table_foreach(table->ht, entry) {
+      _mesa_HashInsert(clonetable, (GLint)(uintptr_t)entry->key, entry->data);
+   }
+
+   _glthread_UNLOCK_MUTEX(table2->Mutex);
+
+   return clonetable;
+}
+
+
+/**
  * Walk over all entries in a hash table, calling callback function for each.
  * Note: we use a separate mutex in this function to avoid a recursive
  * locking deadlock (in case the callback calls _mesa_HashRemove()) and to
diff --git a/src/mesa/main/hash.h b/src/mesa/main/hash.h
index 142d2842c33..b34f32848a5 100644
--- a/src/mesa/main/hash.h
+++ b/src/mesa/main/hash.h
@@ -50,6 +50,9 @@ _mesa_HashDeleteAll(struct _mesa_HashTable *table,
                     void (*callback)(GLuint key, void *data, void *userData),
                     void *userData);
 
+extern struct _mesa_HashTable *
+_mesa_HashClone(const struct _mesa_HashTable *table);
+
 extern void
 _mesa_HashWalk(const struct _mesa_HashTable *table,
                void (*callback)(GLuint key, void *data, void *userData),