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Subject: testBox: allow fuzzy comparison of floats, doubles
From: Steven Chamberlain <steven@pyro.eu.org>
Date: Wed, 24 Feb 2016 01:10:11 +0000
Allow for inexact values, as long as the error is smaller than the
epsilon of the data type.
On 32-bit x86, allow even greater discrepency at double
precision, due to possible double-rounding. See
https://lists.nongnu.org/archive/html/openexr-devel/2015-12/msg00001.html
Index: ilmbase/ImathTest/testBox.cpp
===================================================================
--- ilmbase.orig/ImathTest/testBox.cpp
+++ ilmbase/ImathTest/testBox.cpp
@@ -47,6 +47,58 @@ using namespace IMATH_INTERNAL_NAMESPACE
namespace {
+template <class T>
+bool
+approximatelyEqual (const T &p1, const T &p2)
+{
+ /* int and short should be exact */
+ return (p1 == p2);
+}
+
+bool
+approximatelyEqual (const Vec2<float> &p1, const Vec2<float> &p2)
+{
+ float e = limits<float>::epsilon();
+ float m = 0;
+
+ for (int i = 0; i < 2; ++i)
+ {
+ m = max (m, abs (p1[i]));
+ m = max (m, abs (p2[i]));
+ }
+
+ for (int i = 0; i < 2; ++i)
+ if (!equalWithAbsError (p1[i], p2[i], m * e))
+ return false;
+
+ return true;
+}
+
+bool
+approximatelyEqual (const Vec2<double> &p1, const Vec2<double> &p2)
+{
+#if defined(__i386__) || defined(_M_IX86)
+ /* double-rounding on 32-bit x86 may cause larger error:
+ use epsilon of float rather than double */
+ double e = limits<float>::epsilon();
+#else
+ double e = limits<double>::epsilon();
+#endif
+ double m = 0;
+
+ for (int i = 0; i < 2; ++i)
+ {
+ m = max (m, abs (p1[i]));
+ m = max (m, abs (p2[i]));
+ }
+
+ for (int i = 0; i < 2; ++i)
+ if (!equalWithAbsError (p1[i], p2[i], m * e))
+ return false;
+
+ return true;
+}
+
//
// Test case generation utility - create a vector of IMATH_INTERNAL_NAMESPACE::Vec{2,3,4}
// with all permutations of integers 1..T::dimensions().
@@ -250,7 +302,8 @@ testExtendByPoint(const char *type)
IMATH_INTERNAL_NAMESPACE::Box<T> b;
b.extendBy(p);
- assert(b.min == p && b.max == p);
+ assert (approximatelyEqual (b.min, p));
+ assert (approximatelyEqual (b.max, p));
}
//
@@ -283,7 +336,8 @@ testExtendByPoint(const char *type)
b.extendBy(p);
- assert(b.min == min && b.max == max);
+ assert (approximatelyEqual (b.min, min));
+ assert (approximatelyEqual (b.max, max));
}
}
}
@@ -358,7 +412,8 @@ testExtendByBox(const char *type)
}
b.extendBy(IMATH_INTERNAL_NAMESPACE::Box<T>(p0, p1));
- assert(b.min == min && b.max == max);
+ assert (approximatelyEqual (b.min, min));
+ assert (approximatelyEqual (b.max, max));
}
}
}
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