/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#include "../DSPDemo.h"

//==============================================================================
// @@ START_DEMO
struct StateVariableFilterDemo
{
    void prepare (const ProcessSpec& spec)
    {
        sampleRate = spec.sampleRate;

        filter.state = new StateVariableFilter::Parameters<float>;
        filter.prepare (spec);
    }

    void process (const ProcessContextReplacing<float>& context)
    {
        filter.process (context);
    }

    void reset()
    {
        filter.reset();
    }

    void updateParameters()
    {
        if (sampleRate != 0)
        {
            auto cutoff    = static_cast<float> (cutoffParam.getCurrentValue());
            auto resonance = static_cast<float> (qParam.getCurrentValue());
            auto type      = static_cast<StateVariableFilter::Parameters<float>::Type> (typeParam.getCurrentSelectedID() - 1);

            filter.state->type = type;
            filter.state->setCutOffFrequency (sampleRate, cutoff, resonance);
        }
    }

    //==============================================================================
    ProcessorDuplicator<StateVariableFilter::Filter<float>,
                        StateVariableFilter::Parameters<float>> filter;

    ChoiceParameter typeParam {{ "Low-pass", "Band-pass", "High-pass"}, 1, "Type" };
    SliderParameter cutoffParam {{ 20.0, 20000.0 }, 0.5, 440.0f, "Cutoff", "Hz" };
    SliderParameter qParam {{ 0.3, 20.0 }, 0.5, 1.0 / std::sqrt (2.0), "Resonance" };

    std::vector<DSPDemoParameterBase*> parameters { &typeParam, &cutoffParam, &qParam };
    double sampleRate = 0;
};
// @@ END_DEMO

RegisterDSPDemo<StateVariableFilterDemo> stateVariableFilterDemo ("State Variable Filter", BinaryData::StateVariableFilterDemo_cpp);
