mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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85 lines
3 KiB
C++
85 lines
3 KiB
C++
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#ifndef SPROUT_NUMERIC_DFT_FIXED_SAWTOOTH_HPP
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#define SPROUT_NUMERIC_DFT_FIXED_SAWTOOTH_HPP
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#include <sprout/config.hpp>
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#include <sprout/index_tuple.hpp>
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#include <sprout/container/traits.hpp>
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#include <sprout/container/functions.hpp>
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#include <sprout/container/indexes.hpp>
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#include <sprout/algorithm/fixed/result_of.hpp>
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#include <sprout/math/floor.hpp>
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namespace sprout {
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namespace fixed {
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namespace detail {
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template<typename T>
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inline SPROUT_CONSTEXPR T
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sawtooth_value(T const& t) {
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using sprout::floor;
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return T(2) * (t - floor(t + T(0.5)));
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}
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template<typename Container, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Container>::type
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sawtooth_impl(
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Container const& cont,
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typename sprout::container_traits<Container>::value_type const& frequency,
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typename sprout::container_traits<Container>::value_type const& amplitude,
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typename sprout::container_traits<Container>::value_type const& phase,
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sprout::index_tuple<Indexes...>,
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typename sprout::container_traits<Container>::difference_type offset,
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typename sprout::container_traits<Container>::size_type size
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)
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{
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typedef typename sprout::container_traits<Container>::value_type value_type;
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return sprout::remake<Container>(
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cont,
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size,
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(Indexes >= offset && Indexes < offset + size
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? amplitude * sprout::fixed::detail::sawtooth_value(frequency * value_type(Indexes) + phase)
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: *sprout::next(sprout::internal_begin(cont), Indexes)
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)...
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);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Container>::type
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sawtooth(
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Container const& cont,
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typename sprout::container_traits<Container>::value_type const& frequency,
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typename sprout::container_traits<Container>::value_type const& amplitude,
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typename sprout::container_traits<Container>::value_type const& phase
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)
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{
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typedef typename sprout::container_traits<Container>::value_type value_type;
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return sprout::fixed::detail::sawtooth_impl(
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cont,
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frequency,
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amplitude,
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phase,
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sprout::container_indexes<Container>::make(),
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sprout::internal_begin_offset(cont),
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sprout::size(cont)
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);
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}
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} // namespace detail
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//
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// sawtooth
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//
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::algorithm<Container>::type
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sawtooth(
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Container const& cont,
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typename sprout::container_traits<Container>::value_type const& frequency = 1,
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typename sprout::container_traits<Container>::value_type const& amplitude = 1,
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typename sprout::container_traits<Container>::value_type const& phase = 0
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)
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{
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return sprout::fixed::detail::sawtooth(cont, frequency, amplitude, phase);
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}
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} // namespace fixed
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using sprout::fixed::sawtooth;
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} // namespace sprout
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#endif // #ifndef SPROUT_NUMERIC_DFT_FIXED_SAWTOOTH_HPP
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