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| author | Bastien Montagne <montagne29@wanadoo.fr> | 2015-07-10 15:32:35 +0300 |
|---|---|---|
| committer | Bastien Montagne <montagne29@wanadoo.fr> | 2015-07-10 16:02:43 +0300 |
| commit | 7837f0e8332f3726e0322b0c48b0da4d7c2d5813 (patch) | |
| tree | 4e0b9d6fb5faa6bacd080484d7ef625566d32699 /source/blender/blenlib/BLI_math_base.h | |
| parent | bbcbd2eed9081e0c1127d32e41592a8dc6b5604b (diff) | |
BLI_math 'compare' cleanup & enhancements.
This commit:
* Adds a 'compare_ff' function for absolute 'almost equal' comparison of floats.
* Makes 'compare_vxvx' functions use that new 'compare_ff' one.
* Adds a 'compare_ff_relative' function for secured ulp-based relative comparison of floats.
* Adds matching 'compare_vxvx_relative' functions.
* Adds some basic tests for compare_ff_relative.
See https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/
Note that we could replace our python/mathutils' EXPP_FloatsAreEqual() by BLI's compare_ff_relative
(using a very small absolute max_diff), but these do not have exact same behavior...
Left a comment there for now, we can do it later if/when we are sure it won't break anything!
Diffstat (limited to 'source/blender/blenlib/BLI_math_base.h')
| -rw-r--r-- | source/blender/blenlib/BLI_math_base.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_math_base.h b/source/blender/blenlib/BLI_math_base.h index 39c1b22a632..20b76354f58 100644 --- a/source/blender/blenlib/BLI_math_base.h +++ b/source/blender/blenlib/BLI_math_base.h @@ -196,6 +196,9 @@ MINLINE int max_iii(int a, int b, int c); MINLINE int min_iiii(int a, int b, int c, int d); MINLINE int max_iiii(int a, int b, int c, int d); +MINLINE int compare_ff(float a, float b, const float max_diff); +MINLINE int compare_ff_relative(float a, float b, const float max_diff, const int max_ulps); + MINLINE float signf(float f); MINLINE int signum_i_ex(float a, float eps); MINLINE int signum_i(float a); |