From d1dd06aa0a7fbf3aea51a602af1558022c9a2d3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Fri, 6 Apr 2012 01:56:14 +0200
Subject: [PATCH] Ability to explicitly specify precision for floating-point
 equality.

---
 src/Math/TypeTraits.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/Math/TypeTraits.h b/src/Math/TypeTraits.h
index 4a269fb24..6f7050df2 100644
--- a/src/Math/TypeTraits.h
+++ b/src/Math/TypeTraits.h
@@ -21,6 +21,16 @@
 
 #include <cmath>
 
+/** @brief Precision when testing floats for equality */
+#ifndef FLOAT_EQUALITY_PRECISION
+#define FLOAT_EQUALITY_PRECISION 1.0e-6
+#endif
+
+/** @brief Precision when testing doubles for equality */
+#ifndef DOUBLE_EQUALITY_PRECISION
+#define DOUBLE_EQUALITY_PRECISION 1.0e-12
+#endif
+
 namespace Magnum { namespace Math {
 
 /**
@@ -99,10 +109,10 @@ template<class T> struct _TypeTraitsFloatingPoint {
     }
 };
 template<> struct TypeTraits<float>: public _TypeTraitsFloatingPoint<float> {
-    constexpr inline static float epsilon() { return 1.0e-6f; }
+    constexpr inline static float epsilon() { return FLOAT_EQUALITY_PRECISION; }
 };
 template<> struct TypeTraits<double>: public _TypeTraitsFloatingPoint<double> {
-    constexpr inline static double epsilon() { return 1.0e-12; }
+    constexpr inline static double epsilon() { return DOUBLE_EQUALITY_PRECISION; }
 };
 #endif