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Sprout/sprout/compost/effects/overdriven.hpp
2015-01-10 19:13:57 +09:00

115 lines
3.4 KiB
C++

/*=============================================================================
Copyright (c) 2011-2015 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_EFFECTS_OVERDRIVEN_HPP
#define SPROUT_COMPOST_EFFECTS_OVERDRIVEN_HPP
#include <sprout/config.hpp>
#include <sprout/utility/forward.hpp>
#include <sprout/math/constants.hpp>
#include <sprout/math/atan.hpp>
#include <sprout/range/adaptor/transformed.hpp>
#include <sprout/compost/effects/changed_volume.hpp>
namespace sprout {
namespace compost {
//
// overdrive_clip_value
//
template<typename T = void>
struct overdrive_clip_value {
public:
typedef T argument_type;
typedef T result_type;
public:
SPROUT_CONSTEXPR T
operator()(T const& x) const {
return x >= 0 ? sprout::atan(x) / sprout::math::half_pi<T>()
: sprout::atan(x) / sprout::math::half_pi<T>() / 10
;
}
};
template<>
struct overdrive_clip_value<void> {
public:
template<typename T>
SPROUT_CONSTEXPR T
operator()(T const& x) const {
return sprout::compost::overdrive_clip_value<T>()(x);
}
};
namespace effects {
//
// overdrive_holder
//
template<typename T>
class overdrive_holder {
public:
typedef T value_type;
private:
value_type gain_;
value_type level_;
public:
SPROUT_CONSTEXPR overdrive_holder() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
overdrive_holder(overdrive_holder const&) = default;
SPROUT_CONSTEXPR overdrive_holder(value_type const& gain, value_type const& level)
: gain_(gain), level_(level)
{}
SPROUT_CONSTEXPR value_type const& gain() const {
return gain_;
}
SPROUT_CONSTEXPR value_type const& level() const {
return level_;
}
};
//
// overdriven_forwarder
//
class overdriven_forwarder {
public:
template<typename T>
SPROUT_CONSTEXPR sprout::compost::effects::overdrive_holder<T>
operator()(T const& gain, T const& level) const {
return sprout::compost::effects::overdrive_holder<T>(gain, level);
}
};
//
// overdriven
//
namespace {
SPROUT_STATIC_CONSTEXPR sprout::compost::effects::overdriven_forwarder overdriven = {};
} // anonymous-namespace
//
// operator|
//
template<typename Range, typename T>
inline SPROUT_CONSTEXPR auto
operator|(Range&& lhs, sprout::compost::effects::overdrive_holder<T> const& rhs)
-> decltype(
SPROUT_FORWARD(Range, lhs)
| sprout::compost::effects::changed_volume(rhs.gain())
| sprout::adaptors::transformed(sprout::compost::overdrive_clip_value<>())
| sprout::compost::effects::changed_volume(rhs.level())
)
{
return SPROUT_FORWARD(Range, lhs)
| sprout::compost::effects::changed_volume(rhs.gain())
| sprout::adaptors::transformed(sprout::compost::overdrive_clip_value<>())
| sprout::compost::effects::changed_volume(rhs.level())
;
}
} // namespace effects
using sprout::compost::effects::overdriven;
} // namespace compost
} // namespace sprout
#endif // #ifndef SPROUT_COMPOST_EFFECTS_OVERDRIVEN_HPP