From f95e8445eff8b31dc130756601a528c6f34ceb7d Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Tue, 7 Feb 2017 21:36:24 -0700
Subject: [PATCH] common: fix build error on windows (M_PI->Q_PI)

---
 common/mathlib.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/mathlib.cc b/common/mathlib.cc
index 12b3ee04..c561c726 100644
--- a/common/mathlib.cc
+++ b/common/mathlib.cc
@@ -253,7 +253,7 @@ static float Lanczos1D(float x, float a)
     if (x < -a || x >= a)
         return 0;
     
-    float lanczos = (a * sinf(M_PI * x) * sinf(M_PI * x / a)) / (M_PI * M_PI * x * x);
+    float lanczos = (a * sinf(Q_PI * x) * sinf(Q_PI * x / a)) / (Q_PI * Q_PI * x * x);
     return lanczos;
 }