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[retroray] / libs / cgmath / cgmvec3.inl

diff --git a/libs/cgmath/cgmvec3.inl b/libs/cgmath/cgmvec3.inl
index 874d0fc..8191c63 100644 (file)
--- a/libs/cgmath/cgmvec3.inl
+++ b/libs/cgmath/cgmvec3.inl
@@ -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;