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https://github.com/bolero-MURAKAMI/Sprout.git
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108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
#ifndef SPROUT_COMPOST_EFFECTS_OVERDRIVEN_HPP
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#define SPROUT_COMPOST_EFFECTS_OVERDRIVEN_HPP
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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/atan.hpp>
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#include <sprout/range/adaptor/transformed.hpp>
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#include <sprout/compost/effects/changed_volume.hpp>
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namespace sprout {
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namespace compost {
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//
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// overdrive_clip_value
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//
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template<typename T = void>
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struct overdrive_clip_value {
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public:
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typedef T argument_type;
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typedef T result_type;
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public:
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SPROUT_CONSTEXPR T
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operator()(T const& x) const {
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return x >= 0 ? sprout::atan(x) / sprout::math::half_pi<T>()
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: sprout::atan(x) / sprout::math::half_pi<T>() / 10
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;
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}
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};
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template<>
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struct overdrive_clip_value<void> {
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public:
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template<typename T>
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SPROUT_CONSTEXPR T
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operator()(T const& x) const {
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return sprout::compost::overdrive_clip_value<T>()(x);
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}
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};
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namespace effects {
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//
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// overdrive_holder
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//
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template<typename T>
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class overdrive_holder {
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public:
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typedef T value_type;
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private:
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value_type gain_;
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value_type level_;
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public:
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overdrive_holder() = default;
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overdrive_holder(overdrive_holder const&) = default;
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SPROUT_CONSTEXPR overdrive_holder(value_type const& gain, value_type const& level)
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: gain_(gain), level_(level)
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{}
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SPROUT_CONSTEXPR value_type const& gain() const {
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return gain_;
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}
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SPROUT_CONSTEXPR value_type const& level() const {
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return level_;
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}
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};
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//
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// overdriven_forwarder
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//
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class overdriven_forwarder {
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public:
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template<typename T>
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SPROUT_CONSTEXPR sprout::compost::effects::overdrive_holder<T>
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operator()(T const& gain, T const& level) const {
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return sprout::compost::effects::overdrive_holder<T>(gain, level);
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}
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};
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//
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// overdriven
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//
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namespace {
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SPROUT_STATIC_CONSTEXPR sprout::compost::effects::overdriven_forwarder overdriven = {};
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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>
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inline SPROUT_CONSTEXPR auto
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operator|(Range&& lhs, sprout::compost::effects::overdrive_holder<T> const& rhs)
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-> decltype(
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sprout::forward<Range>(lhs)
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| sprout::compost::effects::changed_volume(rhs.gain())
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| sprout::adaptors::transformed(sprout::compost::overdrive_clip_value<>())
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| sprout::compost::effects::changed_volume(rhs.level())
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)
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{
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return sprout::forward<Range>(lhs)
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| sprout::compost::effects::changed_volume(rhs.gain())
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| sprout::adaptors::transformed(sprout::compost::overdrive_clip_value<>())
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| sprout::compost::effects::changed_volume(rhs.level())
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;
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}
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} // namespace effects
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using sprout::compost::effects::overdriven;
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} // namespace compost
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} // namespace sprout
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#endif // #ifndef SPROUT_COMPOST_EFFECTS_OVERDRIVEN_HPP
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