util: Add inline function for approximate floating point comparison.

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index d1ec13def30f831e81a11f95d65b917ef4177cb2..ee52c09e3476cbdab965445242dbcf72a8082874 100644 (file)
--- 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.