1 files changed, 42 insertions, 0 deletions
diff --git a/core/math/bvh_integrity.inc b/core/math/bvh_integrity.inc
new file mode 100644
index 0000000000..02e9d30097
--- /dev/null
+++ b/core/math/bvh_integrity.inc
@@ -0,0 +1,42 @@
+void _integrity_check_all() {
+#ifdef BVH_INTEGRITY_CHECKS
+	for (int n = 0; n < NUM_TREES; n++) {
+		uint32_t root = _root_node_id[n];
+		if (root != BVHCommon::INVALID) {
+			_integrity_check_down(root);
+		}
+	}
+#endif
+}
+
+void _integrity_check_up(uint32_t p_node_id) {
+	TNode &node = _nodes[p_node_id];
+
+	BVHABB_CLASS abb = node.aabb;
+	node_update_aabb(node);
+
+	BVHABB_CLASS abb2 = node.aabb;
+	abb2.expand(-_node_expansion);
+
+	CRASH_COND(!abb.is_other_within(abb2));
+}
+
+void _integrity_check_down(uint32_t p_node_id) {
+	const TNode &node = _nodes[p_node_id];
+
+	if (node.is_leaf()) {
+		_integrity_check_up(p_node_id);
+	} else {
+		CRASH_COND(node.num_children != 2);
+
+		for (int n = 0; n < node.num_children; n++) {
+			uint32_t child_id = node.children[n];
+
+			// check the children parent pointers are correct
+			TNode &child = _nodes[child_id];
+			CRASH_COND(child.parent_id != p_node_id);
+
+			_integrity_check_down(child_id);
+		}
+	}
+}