From 3326472fee94a24ea3a4dfb1cdba9f17cac55308 Mon Sep 17 00:00:00 2001
From: rambetter <rambetter>
Date: Wed, 12 Jan 2011 03:35:57 +0000
Subject: [PATCH] Adding MATHLIB_VECTOR_NORMALIZE_PRECISION_FIX in mathlib to
 control which version of code in VectorNormalize() is used.  Yes, I put the
 old code back in there, and it's active if
 MATHLIB_VECTOR_NORMALIZE_PRECISION_FIX is 0. Right now it's 1, so the fixed
 code is active.  I need this quick way to test regression tests.

git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@424 8a3a26a2-13c4-0310-b231-cf6edde360e5
---
 libs/mathlib.h         |  3 +++
 libs/mathlib/mathlib.c | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/libs/mathlib.h b/libs/mathlib.h
index cac3597..172d9ea 100644
--- a/libs/mathlib.h
+++ b/libs/mathlib.h
@@ -90,6 +90,9 @@ vec_t VectorLength(vec3_t v);
 void VectorMA( const vec3_t va, vec_t scale, const vec3_t vb, vec3_t vc );
 
 void _CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
+// I need this define in order to test some of the regression tests from time to time.
+// This define affect the precision of VectorNormalize() function only.
+#define MATHLIB_VECTOR_NORMALIZE_PRECISION_FIX 1
 vec_t VectorNormalize (const vec3_t in, vec3_t out);
 vec_t ColorNormalize( const vec3_t in, vec3_t out );
 void VectorInverse (vec3_t v);
diff --git a/libs/mathlib/mathlib.c b/libs/mathlib/mathlib.c
index 0738c9c..8355525 100644
--- a/libs/mathlib/mathlib.c
+++ b/libs/mathlib/mathlib.c
@@ -176,6 +176,8 @@ void _VectorCopy (vec3_t in, vec3_t out)
 
 vec_t VectorNormalize( const vec3_t in, vec3_t out ) {
 
+#if MATHLIB_VECTOR_NORMALIZE_PRECISION_FIX
+
 	// The sqrt() function takes double as an input and returns double as an
 	// output according the the man pages on Debian and on FreeBSD.  Therefore,
 	// I don't see a reason why using a double outright (instead of using the
@@ -199,6 +201,27 @@ vec_t VectorNormalize( const vec3_t in, vec3_t out ) {
 	out[2] = (vec_t) (z / length);
 
 	return (vec_t) length;
+
+#else
+
+	vec_t	length, ilength;
+
+	length = (vec_t)sqrt (in[0]*in[0] + in[1]*in[1] + in[2]*in[2]);
+	if (length == 0)
+	{
+		VectorClear (out);
+		return 0;
+	}
+
+	ilength = 1.0f/length;
+	out[0] = in[0]*ilength;
+	out[1] = in[1]*ilength;
+	out[2] = in[2]*ilength;
+
+	return length;
+
+#endif
+
 }
 
 vec_t ColorNormalize( const vec3_t in, vec3_t out ) {