Commit: 78b94902f839f0fb84e253d3ff1a34cc6cc51919
Author: Sergey Sharybin
Date: Thu Jan 19 14:41:04 2017 +0100
Branches: master
https://developer.blender.org/rB78b94902f839f0fb84e253d3ff1a34cc6cc51919
Cycles: Add fast-math safe isnan and isfinite
Currently unused, but might become really handy in the future.
===================================================================
M intern/cycles/util/util_math.h
===================================================================
diff --git a/intern/cycles/util/util_math.h b/intern/cycles/util/util_math.h
index 6cb68b53d1..d006264641 100644
--- a/intern/cycles/util/util_math.h
+++ b/intern/cycles/util/util_math.h
@@ -1233,6 +1233,20 @@ ccl_device_inline float __uint_as_float(uint i)
return u.f;
}
+/* Versions of functions which are safe for fast math. */
+ccl_device_inline bool isnan_safe(float f)
+{
+ unsigned int x = __float_as_uint(f);
+ return (x << 1) > 0xff000000u;
+}
+
+ccl_device_inline bool isfinite_safe(float f)
+{
+ /* By IEEE 754 rule, 2*Inf equals Inf */
+ unsigned int x = __float_as_uint(f);
+ return (f == f) && (x == 0 || (f != 2.0f*f));
+}
+
/* Interpolation */
template<class A, class B> A lerp(const A& a, const A& b, const B& t)
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