X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=libs%2Fcgmath%2Fcgmvec3.inl;h=8191c63dc1c00b4c4a5d15cb65f04b7ea96da54e;hb=HEAD;hp=e03cc3280f7d0a56fe1323e6c22dd0c1482aac9d;hpb=7fccf8b3543c8cdb993252f0cf9a6b9ed826408e;p=retroray

diff --git a/libs/cgmath/cgmvec3.inl b/libs/cgmath/cgmvec3.inl
index e03cc32..8191c63 100644
--- a/libs/cgmath/cgmvec3.inl
+++ b/libs/cgmath/cgmvec3.inl
@@ -1,5 +1,5 @@
 /* gph-cmath - C graphics math library
- * Copyright (C) 2018 John Tsiombikas <nuclear@member.fsf.org>
+ * Copyright (C) 2018-2023 John Tsiombikas <nuclear@member.fsf.org>
  *
  * This program is free software. Feel free to use, modify, and/or redistribute
  * it under the terms of the MIT/X11 license. See LICENSE for details.
@@ -22,6 +22,13 @@ static CGM_INLINE cgm_vec3 cgm_vvec(float x, float y, float z)
 	return v;
 }
 
+static CGM_INLINE void cgm_vneg(cgm_vec3 *v)
+{
+	v->x = -v->x;
+	v->y = -v->y;
+	v->z = -v->z;
+}
+
 static CGM_INLINE void cgm_vadd(cgm_vec3 *a, const cgm_vec3 *b)
 {
 	a->x += b->x;