diff options
| author | Sergey Sharybin <sergey.vfx@gmail.com> | 2017-01-19 16:41:04 +0300 |
|---|---|---|
| committer | Sergey Sharybin <sergey.vfx@gmail.com> | 2017-01-20 13:26:24 +0300 |
| commit | a1570562f32d8de654fcb2f2770d8fa3933da601 (patch) | |
| tree | 9026a8634cadc3d3f87b9e3501fc1aa209c67ec0 /intern/cycles | |
| parent | 46926b4b117008cdb31b2a7fd3fc780f7c20134d (diff) | |
Cycles: Add fast-math safe isnan and isfinite
Currently unused, but might become really handy in the future.
Diffstat (limited to 'intern/cycles')
| -rw-r--r-- | intern/cycles/util/util_math.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/intern/cycles/util/util_math.h b/intern/cycles/util/util_math.h index 6cb68b53d16..d0062646414 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) |