mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_COMPOST_EFFECTS_TREMOLO_HPP
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#define SPROUT_COMPOST_EFFECTS_TREMOLO_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/math/constants.hpp>
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#include <sprout/math/sin.hpp>
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#include <sprout/range/adaptor/transformed.hpp>
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#include <sprout/range/adaptor/outdirected.hpp>
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#include <sprout/range/adaptor/indexed.hpp>
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namespace sprout {
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namespace compost {
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//
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// tremolo_outdirected_value
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//
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template<typename Value, typename IntType>
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struct tremolo_outdirected_value {
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public:
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typedef Value value_type;
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typedef IntType int_type;
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private:
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value_type depth_;
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value_type rate_;
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int_type samples_per_sec_;
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public:
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SPROUT_CONSTEXPR tremolo_outdirected_value(value_type const& depth, value_type const& rate, int_type samples_per_sec = 44100)
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: depth_(depth), rate_(rate), samples_per_sec_(samples_per_sec)
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{}
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template<typename Outdirected>
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SPROUT_CONSTEXPR typename std::iterator_traits<Outdirected>::value_type
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operator()(Outdirected const& x) const {
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return (1 + depth_ * sprout::math::sin(sprout::math::two_pi<Value>() * rate_ * x.index() / samples_per_sec_)) * *x;
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}
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};
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namespace effects {
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//
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// tremolo_holder
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//
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template<typename T, typename IntType = int>
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class tremolo_holder {
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public:
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typedef T value_type;
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typedef IntType int_type;
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private:
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value_type depth_;
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value_type rate_;
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int_type samples_per_sec_;
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public:
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SPROUT_CONSTEXPR tremolo_holder() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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tremolo_holder(tremolo_holder const&) = default;
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SPROUT_CONSTEXPR tremolo_holder(value_type const& depth, value_type const& rate, int_type samples_per_sec = 44100)
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: depth_(depth), rate_(rate), samples_per_sec_(samples_per_sec)
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{}
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SPROUT_CONSTEXPR value_type const& depth() const {
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return depth_;
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}
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SPROUT_CONSTEXPR value_type const& rate() const {
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return rate_;
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}
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SPROUT_CONSTEXPR int_type const& samples_per_sec() const {
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return samples_per_sec_;
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}
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};
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//
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// tremolo_forwarder
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//
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class tremolo_forwarder {
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public:
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template<typename T, typename IntType>
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SPROUT_CONSTEXPR sprout::compost::effects::tremolo_holder<T, IntType>
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operator()(T const& depth, T const& rate, IntType samples_per_sec) const {
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return sprout::compost::effects::tremolo_holder<T, IntType>(depth, rate, samples_per_sec);
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}
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template<typename T>
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SPROUT_CONSTEXPR sprout::compost::effects::tremolo_holder<T>
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operator()(T const& depth, T const& rate) const {
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return sprout::compost::effects::tremolo_holder<T>(depth, rate);
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}
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};
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//
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// tremolo
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::tremolo_forwarder tremolo = {};
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} // anonymous-namespace
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//
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// operator|
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//
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template<typename Range, typename T, typename IntType>
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inline SPROUT_CONSTEXPR auto
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operator|(Range&& lhs, sprout::compost::effects::tremolo_holder<T, IntType> const& rhs)
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-> decltype(
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SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::indexed | sprout::adaptors::outdirected
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| sprout::adaptors::transformed(
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sprout::compost::tremolo_outdirected_value<T, IntType>(rhs.depth(), rhs.rate(), rhs.samples_per_sec())
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)
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)
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{
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return SPROUT_FORWARD(Range, lhs)
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| sprout::adaptors::indexed | sprout::adaptors::outdirected
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| sprout::adaptors::transformed(
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sprout::compost::tremolo_outdirected_value<T, IntType>(rhs.depth(), rhs.rate(), rhs.samples_per_sec())
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)
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;
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}
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} // namespace effects
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using sprout::compost::effects::tremolo;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_TREMOLO_HPP
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