From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sat, 15 May 2004 23:24:11 +0000 (+0000)
Subject: Tomaz optimized AngleVectors for the roll == 0 case
X-Git-Tag: xonotic-v0.1.0preview~5876
X-Git-Url: http://de.git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=commitdiff_plain;h=2d0642e0d8f430e266ba95b8a339d8fb10a623f3

Tomaz optimized AngleVectors for the roll == 0 case


git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@4173 d7cf8633-e32d-0410-b094-e92efae38249
---

diff --git a/mathlib.c b/mathlib.c
index 22112734..28f7edda 100644
--- a/mathlib.c
+++ b/mathlib.c
@@ -418,20 +418,38 @@ void AngleVectors (const vec3_t angles, vec3_t forward, vec3_t right, vec3_t up)
 	}
 	if (right || up)
 	{
-		angle = angles[ROLL] * (M_PI*2 / 360);
-		sr = sin(angle);
-		cr = cos(angle);
-		if (right)
+		if (angles[ROLL])
 		{
-			right[0] = -1*(sr*sp*cy+cr*-sy);
-			right[1] = -1*(sr*sp*sy+cr*cy);
-			right[2] = -1*(sr*cp);
+			angle = angles[ROLL] * (M_PI*2 / 360);
+			sr = sin(angle);
+			cr = cos(angle);
+			if (right)
+			{
+				right[0] = -1*(sr*sp*cy+cr*-sy);
+				right[1] = -1*(sr*sp*sy+cr*cy);
+				right[2] = -1*(sr*cp);
+			}
+			if (up)
+			{
+				up[0] = (cr*sp*cy+-sr*-sy);
+				up[1] = (cr*sp*sy+-sr*cy);
+				up[2] = cr*cp;
+			}
 		}
-		if (up)
+		else
 		{
-			up[0] = (cr*sp*cy+-sr*-sy);
-			up[1] = (cr*sp*sy+-sr*cy);
-			up[2] = cr*cp;
+			if (right)
+			{
+				right[0] = sy;
+				right[1] = -cy;
+				right[2] = 0;
+			}
+			if (up)
+			{
+				up[0] = (sp*cy);
+				up[1] = (sp*sy);
+				up[2] = cp;
+			}
 		}
 	}
 }