From 956ee5ae9d2232ea05231902aef767c9a1555ffe Mon Sep 17 00:00:00 2001
From: Moses Turner <moses@collabora.com>
Date: Sun, 18 Sep 2022 08:10:43 -0500
Subject: [PATCH] d/ns: Allow for freeing the 3D optical system

---
 .../north_star/distortion_3d/deformation_northstar.cpp    | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/xrt/drivers/north_star/distortion_3d/deformation_northstar.cpp b/src/xrt/drivers/north_star/distortion_3d/deformation_northstar.cpp
index a25828498..c5223e8f5 100644
--- a/src/xrt/drivers/north_star/distortion_3d/deformation_northstar.cpp
+++ b/src/xrt/drivers/north_star/distortion_3d/deformation_northstar.cpp
@@ -267,6 +267,14 @@ ns_3d_create_optical_system(struct ns_3d_eye *eye)
 	return (struct ns_optical_system *)opticalSystem;
 }
 
+extern "C" void
+ns_3d_free_optical_system(struct ns_optical_system **system)
+{
+	OpticalSystem *cast_sys = (OpticalSystem *)*system;
+	delete cast_sys;
+	*system = NULL;
+}
+
 extern "C" void
 ns_3d_display_uv_to_render_uv(struct xrt_vec2 in, struct xrt_vec2 *out, struct ns_3d_eye *eye)
 {