tracktion_MIDITrackerModifier.h

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 /*
    ,--.                     ,--.     ,--.  ,--.
  ,-'  '-.,--.--.,--,--.,---.|  |,-.,-'  '-.`--' ,---. ,--,--,      Copyright 2024
  '-.  .-'|  .--' ,-.  | .--'|     /'-.  .-',--.| .-. ||      \   Tracktion Software
    |  |  |  |  \ '-'  \ `--.|  \  \  |  |  |  |' '-' '|  ||  |       Corporation
    `---' `--'   `--`--'`---'`--'`--' `---' `--' `---' `--''--'    www.tracktion.com
 
    Tracktion Engine uses a GPL/commercial licence - see LICENCE.md for details.
*/
 
namespace tracktion { inline namespace engine
{
 
class MIDITrackerModifier   : public Modifier,
                              private ValueTreeAllEventListener
{
public:
    //==============================================================================
    MIDITrackerModifier (Edit&, const juce::ValueTree&);
    ~MIDITrackerModifier() override;
 
    using Ptr = juce::ReferenceCountedObjectPtr<MIDITrackerModifier>;
    using Array = juce::ReferenceCountedArray<MIDITrackerModifier>;
 
    using Modifier::initialise;
    void initialise() override;
    juce::String getName() const override               { return TRANS("MIDI Tracker Modifier"); }
 
    //==============================================================================
    float getCurrentValue() override;
 
    int getCurrentMIDIValue() const noexcept;
 
    AutomatableParameter::ModifierAssignment* createAssignment (const juce::ValueTree&) override;
 
    juce::StringArray getMidiInputNames() override;
    ProcessingPosition getProcessingPosition() override { return ProcessingPosition::preFX; }
 
    void applyToBuffer (const PluginRenderContext&) override;
 
    //==============================================================================
    struct Assignment   : public AutomatableParameter::ModifierAssignment
    {
        Assignment (const juce::ValueTree&, const MIDITrackerModifier&);
 
        bool isForModifierSource (const ModifierSource&) const override;
        juce::ReferenceCountedObjectPtr<MIDITrackerModifier> getMIDITrackerModifier() const;
 
        const EditItemID midiTrackerModifierID;
 
        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Assignment)
    };
 
    //==============================================================================
    juce::String getSelectableDescription() override    { return getName(); }
 
    //==============================================================================
    enum Type
    {
        pitch          = 0,
        velocity       = 1
    };
 
    static juce::StringArray getTypeNames();
 
    enum Mode
    {
        absolute       = 0,
        relative       = 1
    };
 
    static juce::StringArray getModeNames();
 
    juce::ValueTree getNodeState() const                { return nodeState; }
 
    juce::CachedValue<float> type, mode, relativeRoot, relativeSpread;
 
    AutomatableParameter::Ptr typeParam, modeParam, relativeRootParam, relativeSpreadParam;
 
private:
    juce::ValueTree nodeState;
 
    LambdaTimer changedTimer;
    std::atomic<float> currentModifierValue { 0.0f };
    std::atomic<int> currentMIDIValue { 0 };
 
    struct Map { std::pair<int, float> node[5]; } currentMap;
    const juce::SpinLock mapLock;
 
    void refreshCurrentValue();
    void updateMapFromTree();
    void updateValueFromMap (int);
 
    void midiEvent (const juce::MidiMessage&);
 
    void valueTreeChanged() override;
    void valueTreePropertyChanged (juce::ValueTree&, const juce::Identifier&) override;
};
 
}} // namespace tracktion { inline namespace engine