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121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace dsp
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{
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#ifndef DOXYGEN
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namespace ProcessorHelpers // Internal helper classes used in building the ProcessorChain
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{
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template <int arg>
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struct GetterHelper
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{
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template <typename ProcessorType>
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static auto& get (ProcessorType& a) noexcept { return GetterHelper<arg - 1>::get (a.processors); }
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};
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template <>
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struct GetterHelper<0>
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{
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template <typename ProcessorType>
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static auto& get (ProcessorType& a) noexcept { return a.getProcessor(); }
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};
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template <typename Processor, typename Subclass>
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struct ChainBase
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{
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Processor processor;
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Processor& getProcessor() noexcept { return processor; }
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Subclass& getThis() noexcept { return *static_cast<Subclass*> (this); }
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template <int arg> auto& get() noexcept { return GetterHelper<arg>::get (getThis()); }
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};
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template <typename FirstProcessor, typename... SubsequentProcessors>
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struct Chain : public ChainBase<FirstProcessor, Chain<FirstProcessor, SubsequentProcessors...>>
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{
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using Base = ChainBase<FirstProcessor, Chain<FirstProcessor, SubsequentProcessors...>>;
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void prepare (const ProcessSpec& spec)
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{
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Base::processor.prepare (spec);
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processors.prepare (spec);
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}
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template <typename ProcessContext>
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void process (ProcessContext& context) noexcept
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{
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Base::processor.process (context);
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processors.process (context);
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}
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void reset()
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{
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Base::processor.reset();
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processors.reset();
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}
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Chain<SubsequentProcessors...> processors;
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};
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template <typename ProcessorType>
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struct Chain<ProcessorType> : public ChainBase<ProcessorType, Chain<ProcessorType>>
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{
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using Base = ChainBase<ProcessorType, Chain<ProcessorType>>;
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template <typename ProcessContext>
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void process (ProcessContext& context) noexcept
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{
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Base::processor.process (context);
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}
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void prepare (const ProcessSpec& spec)
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{
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Base::processor.prepare (spec);
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}
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void reset()
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{
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Base::processor.reset();
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}
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};
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}
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#endif
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//==============================================================================
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/**
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This variadically-templated class lets you join together any number of processor
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classes into a single processor which will call process() on them all in sequence.
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*/
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template <typename... Processors>
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using ProcessorChain = ProcessorHelpers::Chain<Processors...>;
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} // namespace dsp
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} // namespace juce
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