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fix math functions

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This commit is contained in:
bolero-MURAKAMI 2013-05-06 00:22:08 +09:00
parent fccb16687b
commit 7794e56192
27 changed files with 342 additions and 102 deletions
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27
sprout/math/tgamma.hpp
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@ -7,9 +7,11 @@
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/math/detail/float_compute.hpp>
#include <sprout/math/isnan.hpp>
#include <sprout/math/copysign.hpp>
#include <sprout/math/factorial.hpp>
#include <sprout/math/iround.hpp>
#include <sprout/math/trunc.hpp>
#include <sprout/math/is_integer.hpp>
#include <sprout/algorithm/clamp.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
@ -105,12 +107,16 @@ namespace sprout {
>
inline SPROUT_CONSTEXPR FloatType
tgamma(FloatType x) {
typedef typename sprout::math::detail::float_compute<FloatType>::type type;
return x == 0 ? std::numeric_limits<FloatType>::infinity()
: x == -std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::quiet_NaN()
return sprout::math::isnan(x) ? x
: x == 0 ? sprout::math::copysign(std::numeric_limits<FloatType>::infinity(), x)
: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::quiet_NaN()
: x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
: x < 0 && x == std::trunc(x) ? std::numeric_limits<FloatType>::quiet_NaN()
: static_cast<FloatType>(sprout::math::detail::tgamma_impl(static_cast<type>(x)))
: x < 0 && sprout::math::is_integer(x) ? std::numeric_limits<FloatType>::quiet_NaN()
#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
: std::tgamma(x)
#else
: static_cast<FloatType>(sprout::math::detail::tgamma_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))
#endif
;
}
@ -123,8 +129,13 @@ namespace sprout {
return sprout::math::detail::tgamma(static_cast<double>(x));
}
} // namespace detail
using NS_SPROUT_MATH_DETAIL::tgamma;
//
// issue:
// [ !SPROUT_USE_BUILTIN_CMATH_FUNCTION ]
// tgamma(-0) returns -<2D>‡ .
// # returns +<2B>‡ . ( same as tgamma(+0) )
//
using sprout::math::detail::tgamma;
} // namespace math
using sprout::math::tgamma;