From 4b330326dfd04c5e534090cccf6da3fc6f04cd20 Mon Sep 17 00:00:00 2001
From: TimePath <andrew.hardaker1995@gmail.com>
Date: Tue, 29 Dec 2015 13:36:18 +1100
Subject: [PATCH] Vector: vlen2 in terms of dotproduct

---
 qcsrc/lib/vector.qh | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/qcsrc/lib/vector.qh b/qcsrc/lib/vector.qh
index c5c4d6555..8a63ae9b1 100644
--- a/qcsrc/lib/vector.qh
+++ b/qcsrc/lib/vector.qh
@@ -2,21 +2,30 @@
 #define VECTOR_H
 
 noref vector _vlen2;
-#define vlen2(v) \
-	(_vlen2 = (v), \
-	  _vlen2.x * _vlen2.x \
-	+ _vlen2.y * _vlen2.y \
-	+ _vlen2.z * _vlen2.z)
+#define vlen2(v) (_vlen2 = (v), dotproduct(_vlen2, _vlen2))
 
+#if 1
 noref float _vdist_f;
 /** Vector distance comparison, avoids sqrt() */
 #define vdist(v, cmp, f) (vlen2(v) cmp (_vdist_f = (f), _vdist_f * _vdist_f))
-/*
+#else
 #define vdist(v, cmp, f) (vlen(v) cmp (f))
-*/
+#endif
+
+#if 1
+#define dotproduct(a, b) ((a) * (b))
+#else
+noref vector _dotproduct_a, _dotproduct_b;
+#define dotproduct(a, b) \
+	(_dotproduct_a = (a), _dotproduct_b = (b), \
+	  _dotproduct_a.x * _dotproduct_b.x \
+	+ _dotproduct_a.y * _dotproduct_b.y \
+	+ _dotproduct_a.z * _dotproduct_b.z)
+#endif
 
+#if 1
 #define cross(a, b) ((a) >< (b))
-/*
+#else
 vector cross(vector a, vector b)
 {
 	return
@@ -24,7 +33,7 @@ vector cross(vector a, vector b)
 	+	'0 1 0' * (a.z * b.x - a.x * b.z)
 	+	'0 0 1' * (a.x * b.y - a.y * b.x);
 }
-*/
+#endif
 
 const vector eX = '1 0 0';
 const vector eY = '0 1 0';
-- 
2.39.2