libix2: support default on NULL AABB in ix2_new()

The -1,-1...1,1 AABB seems so likely to be used, make it the
default used when supplying a NULL for the root AABB.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/ix2.c b/src/ix2.c
index fcdeb79..28c4c11 100644
--- a/src/ix2.c
+++ b/src/ix2.c
@@ -368,12 +368,17 @@ _fail:
 }
 
 
-/* Create a new ix2 index with bounds aabb, splitting nodes > max_per_node until max_depth */
+/* Create a new ix2 index with bounds aabb, splitting nodes > max_per_node until max_depth
+ * If the supplied aabb is NULL, a default one of -1,-1...1,1 is used.
+ * Returns NULL on failure.
+ */
 ix2_t * ix2_new(aabb_t *aabb, unsigned max_per_node, unsigned max_depth)
 {
+	aabb_t	default_aabb = {{-1.f, -1.f}, {1.f, 1.f}};
 	ix2_t	*ix2;
 
-	assert(aabb);
+	if (!aabb)
+		aabb = &default_aabb;
 
 	ix2 = calloc(1, sizeof(ix2_t));
 	if (!ix2)