libix3: add ix3_reset()

This basically amounts to a pad_reset() wrapper.

Also incorporated resets into the test, while fixing a stupid
bug there.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ix3.c b/src/ix3.c
index b5ac3cd..29ee4e7 100644
--- a/src/ix3.c
+++ b/src/ix3.c
@@ -167,7 +167,9 @@ static void init_node(ix3_node_t *node, bb3f_t *aabb)
 	assert(node);
 	assert(aabb);
 
+	node->children = NULL;
 	INIT_LIST_HEAD(&node->objects);
+	node->n_objects = 0;
 
 	node->center.x = aabb->min.x;
 	node->center.y = aabb->min.y;
@@ -508,6 +510,23 @@ fail_ix3:
 }
 
 
+/* Reset the index ix3 to its state as-returned by ix3_new()
+ *
+ * Note this doesn't free memory, it just discards the index while keeping all
+ * the memory around in the caches for efficient reuse.
+ */
+void ix3_reset(ix3_t *ix3)
+{
+	assert(ix3);
+
+	pad_reset(ix3->node_pad);
+	pad_reset(ix3->ref_pad);
+	pad_reset(ix3->object_pad);
+
+	init_node(&ix3->root, &ix3->aabb);
+}
+
+
 /* Free the index ix3 and everything associated with it */
 /* Note the external objects which have been indexed are not freed */
 void ix3_free(ix3_t *ix3)