ModulationSource.h

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/*
 *  File:       ModulationSource.h
 *
 *  Created:    22/11/2020
 *
 *  This file is part of WECore.
 *
 *  WECore is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  WECore is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with WECore.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
namespace WECore {
 
    template <typename SampleType>
    class ModulationSource {
        static_assert(std::is_floating_point<SampleType>::value,
                      "Must be provided with a floating point template type");
 
    public:
        ModulationSource() : _cachedOutput(0) {}
        virtual ~ModulationSource() = default;
 
        inline SampleType getNextOutput(SampleType inSample);
 
        virtual SampleType getLastOutput() const { return _cachedOutput; }
 
        inline void reset();
 
    protected:
        SampleType _cachedOutput;
 
        virtual SampleType _getNextOutputImpl(SampleType inSample) = 0;
 
        virtual void _resetImpl() = 0;
    };
 
    template <typename SampleType>
    SampleType ModulationSource<SampleType>::getNextOutput(SampleType inSample) {
        _cachedOutput = _getNextOutputImpl(inSample);
        return _cachedOutput;
    }
 
    template <typename SampleType>
    void ModulationSource<SampleType>::reset() {
        _resetImpl();
        _cachedOutput = 0;
    }
 
    template <typename SampleType>
    struct ModulationSourceWrapper {
        std::shared_ptr<ModulationSource<SampleType>> source;
        double amount;
    };
 
    template <typename SampleType>
    SampleType calcModValue(const std::vector<ModulationSourceWrapper<SampleType>>& sources) {
        SampleType retVal {0};
 
        for (const ModulationSourceWrapper<SampleType>& source : sources) {
            retVal += source.source->getLastOutput() * source.amount;
        }
 
        return retVal;
    }
}