From 5c9f673e38c8995867aedae3d90ba6fea52bd783 Mon Sep 17 00:00:00 2001
From: Stephen Birarda <commit@birarda.com>
Date: Tue, 9 Feb 2016 15:05:19 -0800
Subject: [PATCH] fix for missing M_PI

---
 libraries/audio/src/AudioHRTF.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libraries/audio/src/AudioHRTF.cpp b/libraries/audio/src/AudioHRTF.cpp
index f788dd816a..a7bae292bc 100644
--- a/libraries/audio/src/AudioHRTF.cpp
+++ b/libraries/audio/src/AudioHRTF.cpp
@@ -59,6 +59,8 @@ static const float crossfadeTable[HRTF_BLOCK] = {
     0.0024846123f, 0.0019026510f, 0.0013981014f, 0.0009710421f, 0.0006215394f, 0.0003496476f, 0.0001554090f, 0.0000388538f, 
 };
 
+static const float TWOPI = 6.283185307f;
+
 //
 // on x86 architecture, assume that SSE2 is present
 //
@@ -509,7 +511,7 @@ static void setAzimuthAndGain(float firCoef[4][HRTF_TAPS], float bqCoef[5][4], i
                               int index, float azimuth, float gain, int channel) {
 
     // convert from radians to table units
-    azimuth *= HRTF_AZIMUTHS / (2.0f * M_PI);
+    azimuth *= HRTF_AZIMUTHS / TWOPI;
 
     // convert from degrees to table units
 //    azimuth *= HRTF_AZIMUTHS / 360.0f;