Mesa (master): util: Add inline function for approximate floating point comparison.

[Jose Fonseca]

Module: Mesa
Branch: master
Commit: b57e18c35cf651addecdfb2339768fbb29c257f5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b57e18c35cf651addecdfb2339768fbb29c257f5

Author: José Fonseca <jfonseca at vmware.com>
Date:   Thu May 27 16:16:11 2010 +0100

util: Add inline function for approximate floating point comparison.

---

 src/gallium/auxiliary/util/u_math.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index d1ec13d..ee52c09 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -335,6 +335,15 @@ util_iround(float f)
 }
 
 
+/**
+ * Approximate floating point comparison
+ */
+static INLINE boolean
+util_is_approx(float a, float b, float tol)
+{
+   return fabs(b - a) <= tol;
+}
+
 
 /**
  * Test if x is NaN or +/- infinity.