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tests: add utils

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Hugues Delorme 2015-04-10 14:28:05 +02:00
parent a50fdabd36
commit e34b0508ad
2 changed files with 89 additions and 0 deletions
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/****************************************************************************
** GeomIO Library
** Copyright FougSys (2 Mar. 2015)
** contact@fougsys.fr
**
** This software is a reusable library whose purpose is to provide complete
** I/O support for various CAD file formats (eg. STL)
**
** This software is governed by the CeCILL-B license under French law and
** abiding by the rules of distribution of free software. You can use,
** modify and/ or redistribute the software under the terms of the CeCILL-B
** license as circulated by CEA, CNRS and INRIA at the following URL
** "http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html".
****************************************************************************/
#include "utils.h"
gmio_bool_t gmio_float32_equals_by_ulp(
gmio_float32_t a, gmio_float32_t b, uint32_t max_ulp_diff)
{
const int32_t ia = gmio_convert_int32(a);
const int32_t ib = gmio_convert_int32(b);
const int32_t slp_diff = ia - ib;
const uint32_t ulp_diff = slp_diff > 0 ? slp_diff : -slp_diff;
/* Different signs, we could maybe get difference to 0, but so close to 0
* using epsilons is better */
if (gmio_int32_sign(ia) != gmio_int32_sign(ib)) {
/* Check for equality to make sure +0 == -0 */
return ia == ib;
}
/* Find the difference in ULPs */
return ulp_diff <= max_ulp_diff;
}
uint32_t gmio_float32_ulp_diff(gmio_float32_t a, gmio_float32_t b)
{
const uint32_t ua = gmio_convert_uint32(a);
const uint32_t ub = gmio_convert_uint32(b);
return ua > ub ? ua - ub : ub - ua;
}

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/****************************************************************************
** GeomIO Library
** Copyright FougSys (2 Mar. 2015)
** contact@fougsys.fr
**
** This software is a reusable library whose purpose is to provide complete
** I/O support for various CAD file formats (eg. STL)
**
** This software is governed by the CeCILL-B license under French law and
** abiding by the rules of distribution of free software. You can use,
** modify and/ or redistribute the software under the terms of the CeCILL-B
** license as circulated by CEA, CNRS and INRIA at the following URL
** "http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.html".
****************************************************************************/
#ifndef GMIO_TESTS_UTILS_H
#define GMIO_TESTS_UTILS_H
#include "../src/gmio_core/global.h"
#include "../src/gmio_core/internal/convert.h"
/*! Does \p a and \p b compares equals by ULP (Units in the Last Place) ?
*
* ULP = spacing between floating-point numbers
*
* See:
* http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
*/
gmio_bool_t gmio_float32_equals_by_ulp(
gmio_float32_t a, gmio_float32_t b, uint32_t max_ulp_diff);
/*! Count of ULP between \p a and \p b */
uint32_t gmio_float32_ulp_diff(gmio_float32_t a, gmio_float32_t b);
/*! Portable sign-extraction for int32 */
GMIO_INLINE int gmio_int32_sign(int32_t v)
{
return (v & 0x80000000) != 0 ? -1 : 1;
}
/*! Portable sign-extraction for float32 */
GMIO_INLINE int gmio_float32_sign(gmio_float32_t v)
{
return gmio_int32_sign(gmio_convert_int32(v));
}
#endif /* GMIO_TESTS_UTILS_H */