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Diffstat (limited to 'source/blender/python/mathutils')
| -rw-r--r-- | source/blender/python/mathutils/mathutils.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/source/blender/python/mathutils/mathutils.c b/source/blender/python/mathutils/mathutils.c index 361fbc8a005..8e14319e258 100644 --- a/source/blender/python/mathutils/mathutils.c +++ b/source/blender/python/mathutils/mathutils.c @@ -348,6 +348,15 @@ int mathutils_any_to_rotmat(float rmat[3][3], PyObject *value, const char *error /* Utility functions */ /* LomontRRDCompare4, Ever Faster Float Comparisons by Randy Dillon */ +/* XXX We may want to use 'safer' BLI's compare_ff_relative ultimately? + * LomontRRDCompare4() is an optimized version of Dawson's AlmostEqual2sComplement() (see [1] and [2]). + * Dawson himself now claims this is not a 'safe' thing to do (pushing ULP method beyond its limits), + * an recommands using work from [3] instead, which is done in BLI func... + * + * [1] http://www.randydillon.org/Papers/2007/everfast.htm + * [2] http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm + * [3] https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ instead + */ #define SIGNMASK(i) (-(int)(((unsigned int)(i)) >> 31)) int EXPP_FloatsAreEqual(float af, float bf, int maxDiff) |