mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-27 21:45:42 +00:00
37 lines
1.4 KiB
C++
37 lines
1.4 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2019 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
|
|
#define SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
|
|
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/detail/pow.hpp>
|
|
#include <sprout/type_traits/float_promote.hpp>
|
|
|
|
namespace sprout {
|
|
namespace compost {
|
|
//
|
|
// rosenberg_value
|
|
// Rosenberg wave is asymmetric waveform,
|
|
// expansion period/reduction period of the glottis is 40%/16% of the cycle,
|
|
// tau1 is expansion period, tau2 is reduction period
|
|
//
|
|
template<typename T>
|
|
inline SPROUT_CONSTEXPR typename sprout::float_promote<T>::type
|
|
rosenberg_value(T x, T tau1, T tau2) {
|
|
typedef typename sprout::float_promote<T>::type type;
|
|
return x >= 0 && x <= tau1
|
|
? 3 * sprout::detail::pow2<type>(x / tau1) - 2 * sprout::detail::pow3<type>(x / tau1)
|
|
: x > tau1 && x <= tau1 + tau2
|
|
? 1 - sprout::detail::pow2<type>((x - tau1) / tau2)
|
|
: 0
|
|
;
|
|
}
|
|
} // namespace compost
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_COMPOST_UTILITY_ROSENBERG_HPP
|