JUCE/modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp

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

   This file is part of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission is granted to use this software under the terms of either:
   a) the GPL v2 (or any later version)
   b) the Affero GPL v3

   Details of these licenses can be found at: www.gnu.org/licenses

   JUCE 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.

   ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.juce.com for more information.

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

#include "../../juce_core/system/juce_TargetPlatform.h"

//==============================================================================
#if JucePlugin_Build_VST3 && (__APPLE_CPP__ || __APPLE_CC__ || _WIN32 || _WIN64)

#if JUCE_PLUGINHOST_VST3 && (JUCE_MAC || JUCE_WINDOWS)
 #undef JUCE_VST3HEADERS_INCLUDE_HEADERS_ONLY
 #define JUCE_VST3HEADERS_INCLUDE_HEADERS_ONLY 1
#endif

#include "../../juce_audio_processors/format_types/juce_VST3Headers.h"

#undef JUCE_VST3HEADERS_INCLUDE_HEADERS_ONLY

#include "../utility/juce_CheckSettingMacros.h"
#include "../utility/juce_IncludeModuleHeaders.h"
#include "../utility/juce_WindowsHooks.h"
#include "../utility/juce_PluginBusUtilities.h"
#include "../../juce_audio_processors/format_types/juce_VST3Common.h"

#ifndef JUCE_VST3_CAN_REPLACE_VST2
 #define JUCE_VST3_CAN_REPLACE_VST2 1
#endif

#ifndef JUCE_VST3_EMULATE_MIDI_CC_WITH_PARAMETERS
 #define JUCE_VST3_EMULATE_MIDI_CC_WITH_PARAMETERS 1
#endif

#if JUCE_VST3_CAN_REPLACE_VST2
 #if JUCE_MSVC
  #pragma warning (push)
  #pragma warning (disable: 4514 4996)
 #endif

 #include <pluginterfaces/vst2.x/vstfxstore.h>

 #if JUCE_MSVC
  #pragma warning (pop)
 #endif
#endif

JUCE_DEFINE_WRAPPER_TYPE (wrapperType_VST3);

namespace juce
{

using namespace Steinberg;

//==============================================================================
#if JUCE_MAC
  extern void initialiseMacVST();

 #if ! JUCE_64BIT
  extern void updateEditorCompBoundsVST (Component*);
 #endif

  extern JUCE_API void* attachComponentToWindowRefVST (Component*, void* parentWindowOrView, bool isNSView);
  extern JUCE_API void detachComponentFromWindowRefVST (Component*, void* nsWindow, bool isNSView);
  extern JUCE_API void setNativeHostWindowSizeVST (void* window, Component*, int newWidth, int newHeight, bool isNSView);
#endif

  enum
  {
      kJuceVST3BypassParamID         = 0x62797073, // 'byps'
      kMidiControllerMappingsStartID = 0x6d636d00  // 'mdm*'
  };

//==============================================================================
class JuceAudioProcessor  : public FUnknown
{
public:
    JuceAudioProcessor (AudioProcessor* source) noexcept
        : isBypassed (false), refCount (0), audioProcessor (source) {}

    virtual ~JuceAudioProcessor() {}

    AudioProcessor* get() const noexcept      { return audioProcessor; }

    JUCE_DECLARE_VST3_COM_QUERY_METHODS
    JUCE_DECLARE_VST3_COM_REF_METHODS

    static const FUID iid;

    bool isBypassed;

private:
    Atomic<int> refCount;
    ScopedPointer<AudioProcessor> audioProcessor;
    ScopedJuceInitialiser_GUI libraryInitialiser;

    JuceAudioProcessor() JUCE_DELETED_FUNCTION;
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JuceAudioProcessor)
};

class JuceVST3Component;

//==============================================================================
class JuceVST3EditController : public Vst::EditController,
                               public Vst::IMidiMapping,
                               public AudioProcessorListener
{
public:
    JuceVST3EditController (Vst::IHostApplication* host)
       #if ! JUCE_FORCE_USE_LEGACY_PARAM_IDS
        : usingManagedParameter (false)
       #endif
    {
        if (host != nullptr)
            host->queryInterface (FUnknown::iid, (void**) &hostContext);
    }

    //==============================================================================
    static const FUID iid;

    //==============================================================================
   #if JUCE_CLANG
    #pragma clang diagnostic push
    #pragma clang diagnostic ignored "-Winconsistent-missing-override"
   #endif

    REFCOUNT_METHODS (ComponentBase)

   #if JUCE_CLANG
    #pragma clang diagnostic pop
   #endif

    tresult PLUGIN_API queryInterface (const TUID targetIID, void** obj) override
    {
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, FObject)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, JuceVST3EditController)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IEditController)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IEditController2)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IConnectionPoint)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IMidiMapping)
        TEST_FOR_COMMON_BASE_AND_RETURN_IF_VALID (targetIID, IPluginBase, Vst::IEditController)
        TEST_FOR_COMMON_BASE_AND_RETURN_IF_VALID (targetIID, IDependent, Vst::IEditController)
        TEST_FOR_COMMON_BASE_AND_RETURN_IF_VALID (targetIID, FUnknown, Vst::IEditController)

        if (doUIDsMatch (targetIID, JuceAudioProcessor::iid))
        {
            audioProcessor->addRef();
            *obj = audioProcessor;
            return kResultOk;
        }

        *obj = nullptr;
        return kNoInterface;
    }

    //==============================================================================
    tresult PLUGIN_API initialize (FUnknown* context) override
    {
        if (hostContext != context)
        {
            if (hostContext != nullptr)
                hostContext->release();

            hostContext = context;

            if (hostContext != nullptr)
                hostContext->addRef();
        }

        return kResultTrue;
    }

    tresult PLUGIN_API terminate() override
    {
        if (AudioProcessor* const pluginInstance = getPluginInstance())
            pluginInstance->removeListener (this);

        audioProcessor = nullptr;

        return EditController::terminate();
    }

    //==============================================================================
    struct Param  : public Vst::Parameter
    {
        Param (AudioProcessor& p, int index, Vst::ParamID paramID)  : owner (p), paramIndex (index)
        {
            info.id = paramID;
            toString128 (info.title, p.getParameterName (index));
            toString128 (info.shortTitle, p.getParameterName (index, 8));
            toString128 (info.units, p.getParameterLabel (index));

            const int numSteps = p.getParameterNumSteps (index);
            info.stepCount = (Steinberg::int32) (numSteps > 0 && numSteps < 0x7fffffff ? numSteps - 1 : 0);
            info.defaultNormalizedValue = p.getParameterDefaultValue (index);
            jassert (info.defaultNormalizedValue >= 0 && info.defaultNormalizedValue <= 1.0f);
            info.unitId = Vst::kRootUnitId;
            info.flags = p.isParameterAutomatable (index) ? Vst::ParameterInfo::kCanAutomate : 0;
        }

        virtual ~Param() {}

        bool setNormalized (Vst::ParamValue v) override
        {
            v = jlimit (0.0, 1.0, v);

            if (v != valueNormalized)
            {
                valueNormalized = v;
                changed();
                return true;
            }

            return false;
        }

        void toString (Vst::ParamValue value, Vst::String128 result) const override
        {
            if (AudioProcessorParameter* p = owner.getParameters()[paramIndex])
                toString128 (result, p->getText ((float) value, 128));
            else
                // remain backward-compatible with old JUCE code
                toString128 (result, owner.getParameterText (paramIndex, 128));
        }

        bool fromString (const Vst::TChar* text, Vst::ParamValue& outValueNormalized) const override
        {
            if (AudioProcessorParameter* p = owner.getParameters()[paramIndex])
            {
                outValueNormalized = p->getValueForText (getStringFromVstTChars (text));
                return true;
            }

            return false;
        }

        static String getStringFromVstTChars (const Vst::TChar* text)
        {
            return juce::String (juce::CharPointer_UTF16 (reinterpret_cast<const juce::CharPointer_UTF16::CharType*> (text)));
        }

        Vst::ParamValue toPlain (Vst::ParamValue v) const override       { return v; }
        Vst::ParamValue toNormalized (Vst::ParamValue v) const override  { return v; }

    private:
        AudioProcessor& owner;
        int paramIndex;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Param)
    };

    //==============================================================================
    struct BypassParam  : public Vst::Parameter
    {
        BypassParam (AudioProcessor& p, Vst::ParamID vstParamID)  : owner (p)
        {
            info.id = vstParamID;
            toString128 (info.title, "Bypass");
            toString128 (info.shortTitle, "Bypass");
            toString128 (info.units, "");
            info.stepCount = 1;
            info.defaultNormalizedValue = 0.0f;
            info.unitId = Vst::kRootUnitId;
            info.flags = Vst::ParameterInfo::kIsBypass | Vst::ParameterInfo::kCanAutomate;
        }

        virtual ~BypassParam() {}

        bool setNormalized (Vst::ParamValue v) override
        {
            bool bypass = (v != 0.0f);
            v = (bypass ? 1.0f : 0.0f);

            if (valueNormalized != v)
            {
                valueNormalized = v;
                changed();
                return true;
            }

            return false;
        }

        void toString (Vst::ParamValue value, Vst::String128 result) const override
        {
            bool bypass = (value != 0.0f);
            toString128 (result, bypass ? "On" : "Off");
        }

        bool fromString (const Vst::TChar* text, Vst::ParamValue& outValueNormalized) const override
        {
            const String paramValueString (getStringFromVstTChars (text));

            if (paramValueString.equalsIgnoreCase ("on")
                 || paramValueString.equalsIgnoreCase ("yes")
                 || paramValueString.equalsIgnoreCase ("true"))
            {
                outValueNormalized = 1.0f;
                return true;
            }

            if (paramValueString.equalsIgnoreCase ("off")
                 || paramValueString.equalsIgnoreCase ("no")
                 || paramValueString.equalsIgnoreCase ("false"))
            {
                outValueNormalized = 0.0f;
                return true;
            }

            var varValue = JSON::fromString (paramValueString);

            if (varValue.isDouble() || varValue.isInt()
                 || varValue.isInt64() || varValue.isBool())
            {
                double value = varValue;
                outValueNormalized = (value != 0.0) ? 1.0f : 0.0f;
                return true;
            }

            return false;
        }

        static String getStringFromVstTChars (const Vst::TChar* text)
        {
            return juce::String (juce::CharPointer_UTF16 (reinterpret_cast<const juce::CharPointer_UTF16::CharType*> (text)));
        }

        Vst::ParamValue toPlain (Vst::ParamValue v) const override       { return v; }
        Vst::ParamValue toNormalized (Vst::ParamValue v) const override  { return v; }

    private:
        AudioProcessor& owner;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BypassParam)
    };

    //==============================================================================
    tresult PLUGIN_API setComponentState (IBStream* stream) override
    {
        // Cubase and Nuendo need to inform the host of the current parameter values
        if (AudioProcessor* const pluginInstance = getPluginInstance())
        {
            const int numParameters = pluginInstance->getNumParameters();

            for (int i = 0; i < numParameters; ++i)
                setParamNormalized (getVSTParamIDForIndex (i), (double) pluginInstance->getParameter (i));

            setParamNormalized (bypassParamID, audioProcessor->isBypassed ? 1.0f : 0.0f);
        }

        return Vst::EditController::setComponentState (stream);
    }

    void setAudioProcessor (JuceAudioProcessor* audioProc)
    {
        if (audioProcessor != audioProc)
        {
            audioProcessor = audioProc;
            setupParameters();
        }
    }

    tresult PLUGIN_API connect (IConnectionPoint* other) override
    {
        if (other != nullptr && audioProcessor == nullptr)
        {
            const tresult result = ComponentBase::connect (other);

            if (! audioProcessor.loadFrom (other))
                sendIntMessage ("JuceVST3EditController", (Steinberg::int64) (pointer_sized_int) this);
            else
                setupParameters();

            return result;
        }

        jassertfalse;
        return kResultFalse;
    }

    //==============================================================================
    tresult PLUGIN_API getMidiControllerAssignment (Steinberg::int32 /*busIndex*/, Steinberg::int16 channel,
                                                    Vst::CtrlNumber midiControllerNumber, Vst::ParamID& resultID) override
    {
        resultID = midiControllerToParameter[channel][midiControllerNumber];

        return kResultTrue; // Returning false makes some hosts stop asking for further MIDI Controller Assignments
    }

    // Converts an incoming parameter index to a MIDI controller:
    bool getMidiControllerForParameter (Vst::ParamID index, int& channel, int& ctrlNumber)
    {
        const int mappedIndex = static_cast<int> (index - parameterToMidiControllerOffset);

        if (isPositiveAndBelow (mappedIndex, numElementsInArray (parameterToMidiController)))
        {
            const MidiController& mc = parameterToMidiController[mappedIndex];

            if (mc.channel != -1 && mc.ctrlNumber != -1)
            {
                channel    = jlimit (1, 16, mc.channel + 1);
                ctrlNumber = mc.ctrlNumber;
                return true;
            }
        }

        return false;
    }

    inline bool isMidiControllerParamID (Vst::ParamID paramID) const noexcept
    {
        return (paramID >= parameterToMidiControllerOffset
                    && isPositiveAndBelow (paramID - parameterToMidiControllerOffset,
                                           static_cast<Vst::ParamID> (numElementsInArray (parameterToMidiController))));
    }

    //==============================================================================
    IPlugView* PLUGIN_API createView (const char* name) override
    {
        if (AudioProcessor* const pluginInstance = getPluginInstance())
        {
            if (pluginInstance->hasEditor() && name != nullptr
                 && strcmp (name, Vst::ViewType::kEditor) == 0)
            {
                return new JuceVST3Editor (*this, *pluginInstance);
            }
        }

        return nullptr;
    }

    //==============================================================================
    void audioProcessorParameterChangeGestureBegin (AudioProcessor*, int index) override        { beginEdit (getVSTParamIDForIndex (index)); }

    void audioProcessorParameterChanged (AudioProcessor*, int index, float newValue) override
    {
        // NB: Cubase has problems if performEdit is called without setParamNormalized
        EditController::setParamNormalized (getVSTParamIDForIndex (index), (double) newValue);
        performEdit (getVSTParamIDForIndex (index), (double) newValue);
    }

    void audioProcessorParameterChangeGestureEnd (AudioProcessor*, int index) override          { endEdit (getVSTParamIDForIndex (index)); }

    void audioProcessorChanged (AudioProcessor*) override
    {
        if (componentHandler != nullptr)
            componentHandler->restartComponent (Vst::kLatencyChanged | Vst::kParamValuesChanged);
    }

    //==============================================================================
    AudioProcessor* getPluginInstance() const noexcept
    {
        if (audioProcessor != nullptr)
            return audioProcessor->get();

        return nullptr;
    }

private:

    friend class JuceVST3Component;

    //==============================================================================
    ComSmartPtr<JuceAudioProcessor> audioProcessor;
    ScopedJuceInitialiser_GUI libraryInitialiser;

    struct MidiController
    {
        MidiController() noexcept  : channel (-1), ctrlNumber (-1) {}

        int channel, ctrlNumber;
    };

    enum { numMIDIChannels = 16 };
    Vst::ParamID parameterToMidiControllerOffset;
    MidiController parameterToMidiController[numMIDIChannels * Vst::kCountCtrlNumber];
    Vst::ParamID midiControllerToParameter[numMIDIChannels][Vst::kCountCtrlNumber];

    //==============================================================================
   #if ! JUCE_FORCE_USE_LEGACY_PARAM_IDS
    bool usingManagedParameter;
    Array<Vst::ParamID> vstParamIDs;
   #endif
    Vst::ParamID bypassParamID;


    //==============================================================================
    void setupParameters()
    {
        if (AudioProcessor* const pluginInstance = getPluginInstance())
        {
            pluginInstance->addListener (this);

           #if JUCE_FORCE_USE_LEGACY_PARAM_IDS
            const bool usingManagedParameter = false;
           #endif

            if (parameters.getParameterCount() <= 0)
            {
                const int numParameters = pluginInstance->getNumParameters();

              #if ! JUCE_FORCE_USE_LEGACY_PARAM_IDS
                usingManagedParameter = (pluginInstance->getParameters().size() == numParameters);
              #endif

                for (int i = 0; i < numParameters; ++i)
                {
                   #if JUCE_FORCE_USE_LEGACY_PARAM_IDS
                    const Vst::ParamID vstParamID = static_cast<Vst::ParamID> (i);
                   #else
                    const Vst::ParamID vstParamID = generateVSTParamIDForIndex (pluginInstance, i);
                    vstParamIDs.add (vstParamID);
                   #endif

                    parameters.addParameter (new Param (*pluginInstance, i, vstParamID));
                }

                bypassParamID = static_cast<Vst::ParamID> (usingManagedParameter ? kJuceVST3BypassParamID : numParameters);
                parameters.addParameter (new BypassParam (*pluginInstance, bypassParamID));
            }

           #if JUCE_VST3_EMULATE_MIDI_CC_WITH_PARAMETERS
            parameterToMidiControllerOffset = static_cast<Vst::ParamID> (usingManagedParameter ? kMidiControllerMappingsStartID
                                                                                               : parameters.getParameterCount());

            initialiseMidiControllerMappings ();
           #endif

            audioProcessorChanged (pluginInstance);
        }
    }

    void initialiseMidiControllerMappings ()
    {
        for (int c = 0, p = 0; c < numMIDIChannels; ++c)
        {
            for (int i = 0; i < Vst::kCountCtrlNumber; ++i, ++p)
            {
                midiControllerToParameter[c][i] = static_cast<Vst::ParamID> (p) + parameterToMidiControllerOffset;
                parameterToMidiController[p].channel = c;
                parameterToMidiController[p].ctrlNumber = i;

                parameters.addParameter (new Vst::Parameter (toString ("MIDI CC " + String (c) + "|" + String (i)),
                                          static_cast<Vst::ParamID> (p) + parameterToMidiControllerOffset, 0, 0, 0,
                                          Vst::ParameterInfo::kCanAutomate, Vst::kRootUnitId));
            }
        }
    }

    void sendIntMessage (const char* idTag, const Steinberg::int64 value)
    {
        jassert (hostContext != nullptr);

        if (Vst::IMessage* message = allocateMessage())
        {
            const FReleaser releaser (message);
            message->setMessageID (idTag);
            message->getAttributes()->setInt (idTag, value);
            sendMessage (message);
        }
    }

    //==============================================================================
   #if JUCE_FORCE_USE_LEGACY_PARAM_IDS
    inline Vst::ParamID getVSTParamIDForIndex (int paramIndex) const noexcept   { return static_cast<Vst::ParamID> (paramIndex); }
   #else
    static Vst::ParamID generateVSTParamIDForIndex (AudioProcessor* const pluginFilter, int paramIndex)
    {
        jassert (pluginFilter != nullptr);

        const int n = pluginFilter->getNumParameters();
        const bool managedParameter = (pluginFilter->getParameters().size() == n);

        if (isPositiveAndBelow (paramIndex, n))
        {
            const String& juceParamID = pluginFilter->getParameterID (paramIndex);
            return managedParameter ? static_cast<Vst::ParamID> (juceParamID.hashCode())
                                    : static_cast<Vst::ParamID> (juceParamID.getIntValue());
        }

        return static_cast<Vst::ParamID> (-1);
    }

    inline Vst::ParamID getVSTParamIDForIndex (int paramIndex) const noexcept
    {
        return usingManagedParameter ? vstParamIDs.getReference (paramIndex)
                                     : static_cast<Vst::ParamID> (paramIndex);
    }
   #endif

    //==============================================================================
    class JuceVST3Editor : public Vst::EditorView
    {
    public:
        JuceVST3Editor (JuceVST3EditController& ec, AudioProcessor& p)
          : Vst::EditorView (&ec, nullptr),
            owner (&ec), pluginInstance (p)
        {
           #if JUCE_MAC
            macHostWindow = nullptr;
            isNSView = false;
           #endif

            component = new ContentWrapperComponent (*this, p);
        }

        //==============================================================================
        tresult PLUGIN_API isPlatformTypeSupported (FIDString type) override
        {
            if (type != nullptr && pluginInstance.hasEditor())
            {
               #if JUCE_WINDOWS
                if (strcmp (type, kPlatformTypeHWND) == 0)
               #else
                if (strcmp (type, kPlatformTypeNSView) == 0 || strcmp (type, kPlatformTypeHIView) == 0)
               #endif
                    return kResultTrue;
            }

            return kResultFalse;
        }

        tresult PLUGIN_API attached (void* parent, FIDString type) override
        {
            if (parent == nullptr || isPlatformTypeSupported (type) == kResultFalse)
                return kResultFalse;

            if (component == nullptr)
                component = new ContentWrapperComponent (*this, pluginInstance);

           #if JUCE_WINDOWS
            component->addToDesktop (0, parent);
            component->setOpaque (true);
            component->setVisible (true);
           #else
            isNSView = (strcmp (type, kPlatformTypeNSView) == 0);
            macHostWindow = juce::attachComponentToWindowRefVST (component, parent, isNSView);
           #endif

            component->resizeHostWindow();
            systemWindow = parent;
            attachedToParent();

            return kResultTrue;
        }

        tresult PLUGIN_API removed() override
        {
            if (component != nullptr)
            {
               #if JUCE_WINDOWS
                component->removeFromDesktop();
               #else
                if (macHostWindow != nullptr)
                {
                    juce::detachComponentFromWindowRefVST (component, macHostWindow, isNSView);
                    macHostWindow = nullptr;
                }
               #endif

                component = nullptr;
            }

            return CPluginView::removed();
        }

        tresult PLUGIN_API onSize (ViewRect* newSize) override
        {
            if (newSize != nullptr)
            {
                rect = *newSize;

                if (component != nullptr)
                    component->setSize (rect.getWidth(), rect.getHeight());

                return kResultTrue;
            }

            jassertfalse;
            return kResultFalse;
        }

        tresult PLUGIN_API getSize (ViewRect* size) override
        {
            if (size != nullptr && component != nullptr)
            {
                *size = ViewRect (0, 0, component->getWidth(), component->getHeight());
                return kResultTrue;
            }

            return kResultFalse;
        }

        tresult PLUGIN_API canResize() override
        {
            if (component != nullptr)
                if (AudioProcessorEditor* editor = component->pluginEditor)
                    return editor->isResizable();

            return true;
        }

        tresult PLUGIN_API checkSizeConstraint (ViewRect* rectToCheck) override
        {
            if (rectToCheck != nullptr && component != nullptr)
            {
                // checkSizeConstraint
                Rectangle<int> juceRect = Rectangle<int>::leftTopRightBottom (rectToCheck->left, rectToCheck->top,
                                                                              rectToCheck->right, rectToCheck->bottom);
                if (AudioProcessorEditor* editor = component->pluginEditor)
                    if (ComponentBoundsConstrainer* constrainer = editor->getConstrainer())
                        juceRect.setSize (jlimit (constrainer->getMinimumWidth(),  constrainer->getMaximumWidth(),  juceRect.getWidth()),
                                          jlimit (constrainer->getMinimumHeight(), constrainer->getMaximumHeight(), juceRect.getHeight()));

                rectToCheck->right  = rectToCheck->left + juceRect.getWidth();
                rectToCheck->bottom = rectToCheck->top  + juceRect.getHeight();

                return kResultTrue;
            }

            jassertfalse;
            return kResultFalse;
        }

    private:
        //==============================================================================
        class ContentWrapperComponent  : public Component
        {
        public:
            ContentWrapperComponent (JuceVST3Editor& editor, AudioProcessor& plugin)
               : pluginEditor (plugin.createEditorIfNeeded()),
                 owner (editor)
            {
                setOpaque (true);
                setBroughtToFrontOnMouseClick (true);

                // if hasEditor() returns true then createEditorIfNeeded has to return a valid editor
                jassert (pluginEditor != nullptr);

                if (pluginEditor != nullptr)
                {
                    addAndMakeVisible (pluginEditor);
                    setBounds (pluginEditor->getLocalBounds());
                    resizeHostWindow();
                }
            }

            ~ContentWrapperComponent()
            {
                if (pluginEditor != nullptr)
                {
                    PopupMenu::dismissAllActiveMenus();
                    pluginEditor->processor.editorBeingDeleted (pluginEditor);
                }
            }

            void paint (Graphics& g) override
            {
                g.fillAll (Colours::black);
            }

            void childBoundsChanged (Component*) override
            {
                resizeHostWindow();
            }

            void resized() override
            {
                if (pluginEditor != nullptr)
                    pluginEditor->setBounds (getLocalBounds());
            }

            void resizeHostWindow()
            {
                if (pluginEditor != nullptr)
                {
                    const int w = pluginEditor->getWidth();
                    const int h = pluginEditor->getHeight();
                    const PluginHostType host (getHostType());

                   #if JUCE_WINDOWS
                    setSize (w, h);
                   #else
                    if (owner.macHostWindow != nullptr && ! (host.isWavelab() || host.isReaper()))
                        juce::setNativeHostWindowSizeVST (owner.macHostWindow, this, w, h, owner.isNSView);
                   #endif

                    if (owner.plugFrame != nullptr)
                    {
                        ViewRect newSize (0, 0, w, h);
                        owner.plugFrame->resizeView (&owner, &newSize);

                       #if JUCE_MAC
                        if (host.isWavelab() || host.isReaper())
                       #else
                        if (host.isWavelab())
                       #endif
                            setBounds (0, 0, w, h);
                    }
                }
            }

            ScopedPointer<AudioProcessorEditor> pluginEditor;

        private:
            JuceVST3Editor& owner;

            JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ContentWrapperComponent)
        };

        //==============================================================================
        ComSmartPtr<JuceVST3EditController> owner;
        AudioProcessor& pluginInstance;

        ScopedPointer<ContentWrapperComponent> component;
        friend class ContentWrapperComponent;

       #if JUCE_MAC
        void* macHostWindow;
        bool isNSView;
       #endif

       #if JUCE_WINDOWS
        WindowsHooks hooks;
       #endif

        ScopedJuceInitialiser_GUI libraryInitialiser;

        //==============================================================================
        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JuceVST3Editor)
    };

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JuceVST3EditController)
};

namespace
{
    template <typename FloatType> struct AudioBusPointerHelper {};
    template <> struct AudioBusPointerHelper<float>  { static inline float**  impl (Vst::AudioBusBuffers& data) noexcept { return data.channelBuffers32; } };
    template <> struct AudioBusPointerHelper<double> { static inline double** impl (Vst::AudioBusBuffers& data) noexcept { return data.channelBuffers64; } };
}


//==============================================================================
class JuceVST3Component : public Vst::IComponent,
                          public Vst::IAudioProcessor,
                          public Vst::IUnitInfo,
                          public Vst::IConnectionPoint,
                          public AudioPlayHead
{
public:
    JuceVST3Component (Vst::IHostApplication* h)
      : refCount (1),
        pluginInstance (createPluginFilterOfType (AudioProcessor::wrapperType_VST3)),
        host (h),
        isMidiInputBusEnabled (false),
        isMidiOutputBusEnabled (false),
        busUtils (*pluginInstance, false)
    {
       #if JucePlugin_WantsMidiInput
        isMidiInputBusEnabled = true;
       #endif

       #if JucePlugin_ProducesMidiOutput
        isMidiOutputBusEnabled = true;
       #endif

        busUtils.init();

        // VST-3 requires your default layout to be non-discrete!
        // For example, your default layout must be mono, stereo, quadrophonic
        // and not AudioChannelSet::discreteChannels (2) etc.
        jassert (busUtils.checkBusFormatsAreNotDiscrete());

        copyBusArrangements (currentBusState.inputBuses,  pluginInstance->busArrangement.inputBuses,  Vst::kInput);
        copyBusArrangements (currentBusState.outputBuses, pluginInstance->busArrangement.outputBuses, Vst::kOutput);

        comPluginInstance = new JuceAudioProcessor (pluginInstance);

        zerostruct (processContext);

        processSetup.maxSamplesPerBlock = 1024;
        processSetup.processMode = Vst::kRealtime;
        processSetup.sampleRate = 44100.0;
        processSetup.symbolicSampleSize = Vst::kSample32;

       #if JUCE_FORCE_USE_LEGACY_PARAM_IDS
        vstBypassParameterId = static_cast<Vst::ParamID> (pluginInstance->getNumParameters());
       #else
        cacheParameterIDs();
       #endif

        pluginInstance->setPlayHead (this);
    }

    ~JuceVST3Component()
    {
        if (pluginInstance != nullptr)
            if (pluginInstance->getPlayHead() == this)
                pluginInstance->setPlayHead (nullptr);
    }

    //==============================================================================
    AudioProcessor& getPluginInstance() const noexcept { return *pluginInstance; }

    //==============================================================================
    static const FUID iid;

    JUCE_DECLARE_VST3_COM_REF_METHODS

    tresult PLUGIN_API queryInterface (const TUID targetIID, void** obj) override
    {
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, IPluginBase)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, JuceVST3Component)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IComponent)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IAudioProcessor)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IUnitInfo)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, Vst::IConnectionPoint)
        TEST_FOR_COMMON_BASE_AND_RETURN_IF_VALID (targetIID, FUnknown, Vst::IComponent)

        if (doUIDsMatch (targetIID, JuceAudioProcessor::iid))
        {
            comPluginInstance->addRef();
            *obj = comPluginInstance;
            return kResultOk;
        }

        *obj = nullptr;
        return kNoInterface;
    }

    //==============================================================================
    tresult PLUGIN_API initialize (FUnknown* hostContext) override
    {
        if (host != hostContext)
            host.loadFrom (hostContext);

        processContext.sampleRate = processSetup.sampleRate;
        preparePlugin (processSetup.sampleRate, (int) processSetup.maxSamplesPerBlock);

        return kResultTrue;
    }

    tresult PLUGIN_API terminate() override
    {
        getPluginInstance().releaseResources();
        return kResultTrue;
    }

    //==============================================================================
    tresult PLUGIN_API connect (IConnectionPoint* other) override
    {
        if (other != nullptr && juceVST3EditController == nullptr)
            juceVST3EditController.loadFrom (other);

        return kResultTrue;
    }

    tresult PLUGIN_API disconnect (IConnectionPoint*) override
    {
        juceVST3EditController = nullptr;
        return kResultTrue;
    }

    tresult PLUGIN_API notify (Vst::IMessage* message) override
    {
        if (message != nullptr && juceVST3EditController == nullptr)
        {
            Steinberg::int64 value = 0;

            if (message->getAttributes()->getInt ("JuceVST3EditController", value) == kResultTrue)
            {
                juceVST3EditController = (JuceVST3EditController*) (pointer_sized_int) value;

                if (juceVST3EditController != nullptr)
                    juceVST3EditController->setAudioProcessor (comPluginInstance);
                else
                    jassertfalse;
            }
        }

        return kResultTrue;
    }

    tresult PLUGIN_API getControllerClassId (TUID classID) override
    {
        memcpy (classID, JuceVST3EditController::iid, sizeof (TUID));
        return kResultTrue;
    }

    //==============================================================================
    tresult PLUGIN_API setActive (TBool state) override
    {
        if (! state)
        {
            getPluginInstance().releaseResources();
        }
        else
        {
            double sampleRate = getPluginInstance().getSampleRate();
            int bufferSize = getPluginInstance().getBlockSize();

            sampleRate = processSetup.sampleRate > 0.0
                            ? processSetup.sampleRate
                            : sampleRate;

            bufferSize = processSetup.maxSamplesPerBlock > 0
                            ? (int) processSetup.maxSamplesPerBlock
                            : bufferSize;

            allocateChannelLists (channelListFloat);
            allocateChannelLists (channelListDouble);

            preparePlugin (sampleRate, bufferSize);
        }

        return kResultOk;
    }

    tresult PLUGIN_API setIoMode (Vst::IoMode) override                                 { return kNotImplemented; }
    tresult PLUGIN_API getRoutingInfo (Vst::RoutingInfo&, Vst::RoutingInfo&) override   { return kNotImplemented; }

    bool isBypassed()                { return comPluginInstance->isBypassed; }
    void setBypassed (bool bypassed) { comPluginInstance->isBypassed = bypassed; }

    //==============================================================================
    void writeJucePrivateStateInformation (MemoryOutputStream& out)
    {
        ValueTree privateData (kJucePrivateDataIdentifier);

        // for now we only store the bypass value
        privateData.setProperty ("Bypass", var (isBypassed()), nullptr);

        privateData.writeToStream (out);
    }

    void setJucePrivateStateInformation (const void* data, int sizeInBytes)
    {
        ValueTree privateData = ValueTree::readFromData (data, static_cast<size_t> (sizeInBytes));
        setBypassed (static_cast<bool> (privateData.getProperty ("Bypass", var (false))));
    }

    void getStateInformation (MemoryBlock& destData)
    {
        pluginInstance->getStateInformation (destData);

        // With bypass support, JUCE now needs to store private state data.
        // Put this at the end of the plug-in state and add a few null characters
        // so that plug-ins built with older versions of JUCE will hopefully ignore
        // this data. Additionally, we need to add some sort of magic identifier
        // at the very end of the private data so that JUCE has some sort of
        // way to figure out if the data was stored with a newer JUCE version.
        MemoryOutputStream extraData;

        extraData.writeInt64 (0);
        writeJucePrivateStateInformation (extraData);
        const int64 privateDataSize = (int64) (extraData.getDataSize() - sizeof (int64));
        extraData.writeInt64 (privateDataSize);
        extraData << kJucePrivateDataIdentifier;

        // write magic string
        destData.append (extraData.getData(), extraData.getDataSize());
    }

    void setStateInformation (const void* data, int sizeAsInt)
    {
        int64 size = sizeAsInt;

        // Check if this data was written with a newer JUCE version
        // and if it has the JUCE private data magic code at the end
        const size_t jucePrivDataIdentifierSize = std::strlen (kJucePrivateDataIdentifier);

        if ((size_t) size >= jucePrivDataIdentifierSize + sizeof (int64))
        {
            const char* buffer = static_cast<const char*> (data);

            String magic (CharPointer_UTF8 (buffer + size - jucePrivDataIdentifierSize),
                          CharPointer_UTF8 (buffer + size));

            if (magic == kJucePrivateDataIdentifier)
            {
                // found a JUCE private data section
                uint64 privateDataSize;

                std::memcpy (&privateDataSize,
                             buffer + ((size_t) size - jucePrivDataIdentifierSize - sizeof (uint64)),
                             sizeof (uint64));

                privateDataSize = ByteOrder::swapIfBigEndian (privateDataSize);
                size -= privateDataSize + jucePrivDataIdentifierSize + sizeof (uint64);

                if (privateDataSize > 0)
                    setJucePrivateStateInformation (buffer + size, static_cast<int> (privateDataSize));

                size -= sizeof (uint64);
            }
        }

        if (size >= 0)
            pluginInstance->setStateInformation (data, static_cast<int> (size));
    }

    //==============================================================================
   #if JUCE_VST3_CAN_REPLACE_VST2
    void loadVST2VstWBlock (const char* data, int size)
    {
        const int headerLen = static_cast<int> (htonl (*(juce::int32*) (data + 4)));
        const struct fxBank* bank = (const struct fxBank*) (data + (8 + headerLen));
        const int version = static_cast<int> (htonl (bank->version)); ignoreUnused (version);

        jassert ('VstW' == htonl (*(juce::int32*) data));
        jassert (1 == htonl (*(juce::int32*) (data + 8))); // version should be 1 according to Steinberg's docs
        jassert (cMagic == htonl (bank->chunkMagic));
        jassert (chunkBankMagic == htonl (bank->fxMagic));
        jassert (version == 1 || version == 2);
        jassert (JucePlugin_VSTUniqueID == htonl (bank->fxID));

        setStateInformation (bank->content.data.chunk,
                             jmin ((int) (size - (bank->content.data.chunk - data)),
                                   (int) htonl (bank->content.data.size)));
    }

    bool loadVST3PresetFile (const char* data, int size)
    {
        if (size < 48)
            return false;

        // At offset 4 there's a little-endian version number which seems to typically be 1
        // At offset 8 there's 32 bytes the SDK calls "ASCII-encoded class id"
        const int chunkListOffset = (int) ByteOrder::littleEndianInt (data + 40);
        jassert (memcmp (data + chunkListOffset, "List", 4) == 0);
        const int entryCount = (int) ByteOrder::littleEndianInt (data + chunkListOffset + 4);
        jassert (entryCount > 0);

        for (int i = 0; i < entryCount; ++i)
        {
            const int entryOffset = chunkListOffset + 8 + 20 * i;

            if (entryOffset + 20 > size)
                return false;

            if (memcmp (data + entryOffset, "Comp", 4) == 0)
            {
                // "Comp" entries seem to contain the data.
                juce::uint64 chunkOffset = ByteOrder::littleEndianInt64 (data + entryOffset + 4);
                juce::uint64 chunkSize   = ByteOrder::littleEndianInt64 (data + entryOffset + 12);

                if (chunkOffset + chunkSize > static_cast<juce::uint64> (size))
                {
                    jassertfalse;
                    return false;
                }

                loadVST2VstWBlock (data + chunkOffset, (int) chunkSize);
            }
        }

        return true;
    }

    bool loadVST2CompatibleState (const char* data, int size)
    {
        if (size < 4)
            return false;

        if (htonl (*(juce::int32*) data) == 'VstW')
        {
            loadVST2VstWBlock (data, size);
            return true;
        }

        if (memcmp (data, "VST3", 4) == 0)
        {
            // In Cubase 5, when loading VST3 .vstpreset files,
            // we get the whole content of the files to load.
            // In Cubase 7 we get just the contents within and
            // we go directly to the loadVST2VstW codepath instead.
            return loadVST3PresetFile (data, size);
        }

        return false;
    }
   #endif

    bool loadStateData (const void* data, int size)
    {
       #if JUCE_VST3_CAN_REPLACE_VST2
        return loadVST2CompatibleState ((const char*) data, size);
       #else
        setStateInformation (data, size);
        return true;
       #endif
    }

    bool readFromMemoryStream (IBStream* state)
    {
        FUnknownPtr<MemoryStream> s (state);

        if (s != nullptr
             && s->getData() != nullptr
             && s->getSize() > 0
             && s->getSize() < 1024 * 1024 * 100) // (some hosts seem to return junk for the size)
        {
            // Adobe Audition CS6 hack to avoid trying to use corrupted streams:
            if (getHostType().isAdobeAudition())
                if (s->getSize() >= 5 && memcmp (s->getData(), "VC2!E", 5) == 0)
                    return false;

            return loadStateData (s->getData(), (int) s->getSize());
        }

        return false;
    }

    bool readFromUnknownStream (IBStream* state)
    {
        MemoryOutputStream allData;

        {
            const size_t bytesPerBlock = 4096;
            HeapBlock<char> buffer (bytesPerBlock);

            for (;;)
            {
                Steinberg::int32 bytesRead = 0;
                const Steinberg::tresult status = state->read (buffer, (Steinberg::int32) bytesPerBlock, &bytesRead);

                if (bytesRead <= 0 || (status != kResultTrue && ! getHostType().isWavelab()))
                    break;

                allData.write (buffer, static_cast<size_t> (bytesRead));
            }
        }

        const size_t dataSize = allData.getDataSize();

        return dataSize > 0 && dataSize < 0x7fffffff
                && loadStateData (allData.getData(), (int) dataSize);
    }

    tresult PLUGIN_API setState (IBStream* state) override
    {
        if (state == nullptr)
            return kInvalidArgument;

        FUnknownPtr<IBStream> stateRefHolder (state); // just in case the caller hasn't properly ref-counted the stream object

        if (state->seek (0, IBStream::kIBSeekSet, nullptr) == kResultTrue)
            if (readFromMemoryStream (state) || readFromUnknownStream (state))
                return kResultTrue;

        return kResultFalse;
    }

   #if JUCE_VST3_CAN_REPLACE_VST2
    static tresult writeVST2Int (IBStream* state, int n)
    {
        juce::int32 t = (juce::int32) htonl (n);
        return state->write (&t, 4);
    }

    static tresult writeVST2Header (IBStream* state, bool bypassed)
    {
        tresult status = writeVST2Int (state, 'VstW');

        if (status == kResultOk) status = writeVST2Int (state, 8); // header size
        if (status == kResultOk) status = writeVST2Int (state, 1); // version
        if (status == kResultOk) status = writeVST2Int (state, bypassed ? 1 : 0); // bypass

        return status;
    }
   #endif

    tresult PLUGIN_API getState (IBStream* state) override
    {
       if (state == nullptr)
           return kInvalidArgument;

        juce::MemoryBlock mem;
        getStateInformation (mem);

      #if JUCE_VST3_CAN_REPLACE_VST2
        tresult status = writeVST2Header (state, isBypassed());

        if (status != kResultOk)
            return status;

        const int bankBlockSize = 160;
        struct fxBank bank;

        zerostruct (bank);
        bank.chunkMagic         = (VstInt32) htonl (cMagic);
        bank.byteSize           = (VstInt32) htonl (bankBlockSize - 8 + (unsigned int) mem.getSize());
        bank.fxMagic            = (VstInt32) htonl (chunkBankMagic);
        bank.version            = (VstInt32) htonl (2);
        bank.fxID               = (VstInt32) htonl (JucePlugin_VSTUniqueID);
        bank.fxVersion          = (VstInt32) htonl (JucePlugin_VersionCode);
        bank.content.data.size  = (VstInt32) htonl ((unsigned int) mem.getSize());

        status = state->write (&bank, bankBlockSize);

        if (status != kResultOk)
            return status;
       #endif

        return state->write (mem.getData(), (Steinberg::int32) mem.getSize());
    }

    //==============================================================================
    Steinberg::int32 PLUGIN_API getUnitCount() override
    {
        return 1;
    }

    tresult PLUGIN_API getUnitInfo (Steinberg::int32 unitIndex, Vst::UnitInfo& info) override
    {
        if (unitIndex == 0)
        {
            info.id             = Vst::kRootUnitId;
            info.parentUnitId   = Vst::kNoParentUnitId;
            info.programListId  = Vst::kNoProgramListId;

            toString128 (info.name, TRANS("Root Unit"));

            return kResultTrue;
        }

        zerostruct (info);
        return kResultFalse;
    }

    Steinberg::int32 PLUGIN_API getProgramListCount() override
    {
        if (getPluginInstance().getNumPrograms() > 0)
            return 1;

        return 0;
    }

    tresult PLUGIN_API getProgramListInfo (Steinberg::int32 listIndex, Vst::ProgramListInfo& info) override
    {
        if (listIndex == 0)
        {
            info.id = paramPreset;
            info.programCount = (Steinberg::int32) getPluginInstance().getNumPrograms();

            toString128 (info.name, TRANS("Factory Presets"));

            return kResultTrue;
        }

        jassertfalse;
        zerostruct (info);
        return kResultFalse;
    }

    tresult PLUGIN_API getProgramName (Vst::ProgramListID listId, Steinberg::int32 programIndex, Vst::String128 name) override
    {
        if (listId == paramPreset
            && isPositiveAndBelow ((int) programIndex, getPluginInstance().getNumPrograms()))
        {
            toString128 (name, getPluginInstance().getProgramName ((int) programIndex));
            return kResultTrue;
        }

        jassertfalse;
        toString128 (name, juce::String());
        return kResultFalse;
    }

    tresult PLUGIN_API getProgramInfo (Vst::ProgramListID, Steinberg::int32, Vst::CString, Vst::String128) override             { return kNotImplemented; }
    tresult PLUGIN_API hasProgramPitchNames (Vst::ProgramListID, Steinberg::int32) override                                     { return kNotImplemented; }
    tresult PLUGIN_API getProgramPitchName (Vst::ProgramListID, Steinberg::int32, Steinberg::int16, Vst::String128) override    { return kNotImplemented; }
    tresult PLUGIN_API selectUnit (Vst::UnitID) override                                                                        { return kNotImplemented; }
    tresult PLUGIN_API setUnitProgramData (Steinberg::int32, Steinberg::int32, IBStream*) override                              { return kNotImplemented; }
    Vst::UnitID PLUGIN_API getSelectedUnit() override                                                                           { return Vst::kRootUnitId; }

    tresult PLUGIN_API getUnitByBus (Vst::MediaType, Vst::BusDirection, Steinberg::int32, Steinberg::int32, Vst::UnitID& unitId) override
    {
        zerostruct (unitId);
        return kNotImplemented;
    }

    //==============================================================================
    bool getCurrentPosition (CurrentPositionInfo& info) override
    {
        info.timeInSamples              = jmax ((juce::int64) 0, processContext.projectTimeSamples);
        info.timeInSeconds              = processContext.systemTime / 1000000000.0;
        info.bpm                        = jmax (1.0, processContext.tempo);
        info.timeSigNumerator           = jmax (1, (int) processContext.timeSigNumerator);
        info.timeSigDenominator         = jmax (1, (int) processContext.timeSigDenominator);
        info.ppqPositionOfLastBarStart  = processContext.barPositionMusic;
        info.ppqPosition                = processContext.projectTimeMusic;
        info.ppqLoopStart               = processContext.cycleStartMusic;
        info.ppqLoopEnd                 = processContext.cycleEndMusic;
        info.isRecording                = (processContext.state & Vst::ProcessContext::kRecording) != 0;
        info.isPlaying                  = (processContext.state & Vst::ProcessContext::kPlaying) != 0;
        info.isLooping                  = (processContext.state & Vst::ProcessContext::kCycleActive) != 0;
        info.editOriginTime             = 0.0;
        info.frameRate                  = AudioPlayHead::fpsUnknown;

        if ((processContext.state & Vst::ProcessContext::kSmpteValid) != 0)
        {
            switch (processContext.frameRate.framesPerSecond)
            {
                case 24: info.frameRate = AudioPlayHead::fps24; break;
                case 25: info.frameRate = AudioPlayHead::fps25; break;
                case 29: info.frameRate = AudioPlayHead::fps30drop; break;

                case 30:
                {
                    if ((processContext.frameRate.flags & Vst::FrameRate::kDropRate) != 0)
                        info.frameRate = AudioPlayHead::fps30drop;
                    else
                        info.frameRate = AudioPlayHead::fps30;
                }
                break;

                default: break;
            }
        }

        return true;
    }

    //==============================================================================
    Steinberg::int32 PLUGIN_API getBusCount (Vst::MediaType type, Vst::BusDirection dir) override
    {
        if (type == Vst::kAudio)
            return (dir == Vst::kInput ? pluginInstance->busArrangement.inputBuses
                                       : pluginInstance->busArrangement.outputBuses).size();

        if (type == Vst::kEvent)
        {
            if (dir == Vst::kInput)
                return isMidiInputBusEnabled ? 1 : 0;

            if (dir == Vst::kOutput)
                return isMidiOutputBusEnabled ? 1 : 0;
        }

        return 0;
    }

    static const AudioProcessor::AudioProcessorBus* getAudioBus (AudioProcessor::AudioBusArrangement& busArrangement,
                                                                 Vst::BusDirection dir, Steinberg::int32 index) noexcept
    {
        const Array<AudioProcessor::AudioProcessorBus>& buses = dir == Vst::kInput ? busArrangement.inputBuses
                                                                                   : busArrangement.outputBuses;

        return isPositiveAndBelow (index, static_cast<Steinberg::int32> (buses.size())) ? &buses.getReference (index) : nullptr;
    }

    const AudioProcessor::AudioProcessorBus* getAudioBus (Vst::BusDirection dir, Steinberg::int32 index) const noexcept
    {
        return getAudioBus (pluginInstance->busArrangement, dir, index);
    }

    tresult PLUGIN_API getBusInfo (Vst::MediaType type, Vst::BusDirection dir,
                                   Steinberg::int32 index, Vst::BusInfo& info) override
    {
        if (type == Vst::kAudio)
        {
            if (const AudioProcessor::AudioProcessorBus* bus = getAudioBus (currentBusState, dir, index))
            {
                info.mediaType = Vst::kAudio;
                info.direction = dir;
                info.channelCount = bus->channels.size();
                toString128 (info.name, bus->name);

               #if JucePlugin_IsSynth
                info.busType = (dir == Vst::kInput && index > 0 ? Vst::kAux : Vst::kMain);
               #else
                info.busType = (index == 0 ? Vst::kMain : Vst::kAux);
               #endif

                info.flags = busUtils.isBusEnabledByDefault (dir == Vst::kInput, index) ? Vst::BusInfo::kDefaultActive : 0;
                return kResultTrue;
            }
        }

        if (type == Vst::kEvent)
        {
            info.flags = Vst::BusInfo::kDefaultActive;

           #if JucePlugin_WantsMidiInput
            if (dir == Vst::kInput)
            {
                info.mediaType = Vst::kEvent;
                info.direction = dir;
                info.channelCount = 16;
                toString128 (info.name, TRANS("MIDI Input"));
                info.busType = Vst::kMain;
                return kResultTrue;
            }
           #endif

           #if JucePlugin_ProducesMidiOutput
            if (dir == Vst::kOutput)
            {
                info.mediaType = Vst::kEvent;
                info.direction = dir;
                info.channelCount = 16;
                toString128 (info.name, TRANS("MIDI Output"));
                info.busType = Vst::kMain;
                return kResultTrue;
            }
           #endif
        }

        zerostruct (info);
        return kResultFalse;
    }

    tresult PLUGIN_API activateBus (Vst::MediaType type, Vst::BusDirection dir, Steinberg::int32 index, TBool state) override
    {
        if (type == Vst::kEvent)
        {
            if (index != 0)
                return kResultFalse;

            if (dir == Vst::kInput)
                isMidiInputBusEnabled = (state != 0);
            else
                isMidiOutputBusEnabled = (state != 0);

            return kResultTrue;
        }

        if (type == Vst::kAudio)
        {
            if (const AudioProcessor::AudioProcessorBus* bus = getAudioBus (dir, index))
            {
                if (state == (bus->channels.size() > 0))
                    return kResultTrue;

                AudioChannelSet newChannels;

                if (state)
                    if (const AudioProcessor::AudioProcessorBus* lastBusState = getAudioBus (currentBusState, dir, index))
                        newChannels = lastBusState->channels;

                if (pluginInstance->setPreferredBusArrangement (dir == Vst::kInput, index, newChannels))
                    return kResultTrue;
            }
        }

        return kResultFalse;
    }

    void copyBusArrangements (Array<AudioProcessor::AudioProcessorBus>& copies,
                              const Array<AudioProcessor::AudioProcessorBus>& source,
                              Vst::BusDirection dir)
    {
        for (int i = 0; i < source.size(); ++i)
        {
            AudioProcessor::AudioProcessorBus bus = source.getReference (i);

            if (bus.channels.size() == 0 && i < copies.size())
                bus = AudioProcessor::AudioProcessorBus (bus.name, copies.getReference (i).channels);

            if (bus.channels.size() == 0)
                bus = AudioProcessor::AudioProcessorBus (bus.name, busUtils.getDefaultLayoutForBus (dir == Vst::kInput, i));

            copies.set (i, bus);
        }
    }

    tresult PLUGIN_API setBusArrangements (Vst::SpeakerArrangement* inputs, Steinberg::int32 numIns,
                                           Vst::SpeakerArrangement* outputs, Steinberg::int32 numOuts) override
    {
        PluginBusUtilities::ScopedBusRestorer restorer (busUtils);

        Array<bool> inputsEnabled, outputsEnabled;

        // save enabled/disabled state of buses
        for (int i = 0; i < busUtils.getBusCount (true); ++i)
            inputsEnabled.add (busUtils.isBusEnabled (true, i));

        for (int i = 0; i < busUtils.getBusCount (false); ++i)
            outputsEnabled.add (busUtils.isBusEnabled (false, i));

        // set the buses
        for (int i = 0; i < numIns; ++i)
            if (! pluginInstance->setPreferredBusArrangement (true, i, getChannelSetForSpeakerArrangement (inputs[i])))
                return kInvalidArgument;

        for (int i = 0; i < numOuts; ++i)
            if (! pluginInstance->setPreferredBusArrangement (false, i, getChannelSetForSpeakerArrangement (outputs[i])))
                return kInvalidArgument;

        // re-check if the bus arrangement mateches the request
        for (int i = 0; i < numIns; ++i)
            if (getChannelSetForSpeakerArrangement (inputs[i]) != busUtils.getChannelSet (true, i))
                return kInvalidArgument;

        for (int i = 0; i < numOuts; ++i)
            if (getChannelSetForSpeakerArrangement (outputs[i]) != busUtils.getChannelSet (false, i))
                return kInvalidArgument;

        // save the state of the plug-in layout
        copyBusArrangements (currentBusState.inputBuses,  pluginInstance->busArrangement.inputBuses,  Vst::kInput);
        copyBusArrangements (currentBusState.outputBuses, pluginInstance->busArrangement.outputBuses, Vst::kOutput);

        // re-enable/disable the buses
        for (int i = 0; i < busUtils.getBusCount (true); ++i)
            if (! inputsEnabled.getReference (i) && busUtils.isBusEnabled (true, i))
                if (! pluginInstance->setPreferredBusArrangement (true, i, AudioChannelSet()))
                    return kInvalidArgument;

        for (int i = 0; i < busUtils.getBusCount (false); ++i)
            if (! outputsEnabled.getReference (i) && busUtils.isBusEnabled (false, i))
                if (! pluginInstance->setPreferredBusArrangement (false, i, AudioChannelSet()))
                    return kInvalidArgument;

        restorer.release();

        preparePlugin (getPluginInstance().getSampleRate(),
                       getPluginInstance().getBlockSize());

        return kResultTrue;
    }

    tresult PLUGIN_API getBusArrangement (Vst::BusDirection dir, Steinberg::int32 index, Vst::SpeakerArrangement& arr) override
    {
        if (const AudioProcessor::AudioProcessorBus* bus = getAudioBus (currentBusState, dir, index))
        {
            arr = getSpeakerArrangement (bus->channels);
            return kResultTrue;
        }

        return kResultFalse;
    }

    //==============================================================================
    tresult PLUGIN_API canProcessSampleSize (Steinberg::int32 symbolicSampleSize) override
    {
        return (symbolicSampleSize == Vst::kSample32
                 || (getPluginInstance().supportsDoublePrecisionProcessing()
                       && symbolicSampleSize == Vst::kSample64)) ? kResultTrue : kResultFalse;
    }

    Steinberg::uint32 PLUGIN_API getLatencySamples() override
    {
        return (Steinberg::uint32) jmax (0, getPluginInstance().getLatencySamples());
    }

    tresult PLUGIN_API setupProcessing (Vst::ProcessSetup& newSetup) override
    {
        if (canProcessSampleSize (newSetup.symbolicSampleSize) != kResultTrue)
            return kResultFalse;

        processSetup = newSetup;
        processContext.sampleRate = processSetup.sampleRate;

        getPluginInstance().setProcessingPrecision (newSetup.symbolicSampleSize == Vst::kSample64
                                                        ? AudioProcessor::doublePrecision
                                                        : AudioProcessor::singlePrecision);

        preparePlugin (processSetup.sampleRate, processSetup.maxSamplesPerBlock);

        return kResultTrue;
    }

    tresult PLUGIN_API setProcessing (TBool state) override
    {
        if (! state)
            getPluginInstance().reset();

        return kResultTrue;
    }

    Steinberg::uint32 PLUGIN_API getTailSamples() override
    {
        const double tailLengthSeconds = getPluginInstance().getTailLengthSeconds();

        if (tailLengthSeconds <= 0.0 || processSetup.sampleRate > 0.0)
            return Vst::kNoTail;

        return (Steinberg::uint32) roundToIntAccurate (tailLengthSeconds * processSetup.sampleRate);
    }

    //==============================================================================
    void processParameterChanges (Vst::IParameterChanges& paramChanges)
    {
        jassert (pluginInstance != nullptr);

        const Steinberg::int32 numParamsChanged = paramChanges.getParameterCount();

        for (Steinberg::int32 i = 0; i < numParamsChanged; ++i)
        {
            if (Vst::IParamValueQueue* paramQueue = paramChanges.getParameterData (i))
            {
                const Steinberg::int32 numPoints = paramQueue->getPointCount();

                Steinberg::int32 offsetSamples;
                double value = 0.0;

                if (paramQueue->getPoint (numPoints - 1,  offsetSamples, value) == kResultTrue)
                {
                    const Vst::ParamID vstParamID = paramQueue->getParameterId();

                    if (vstParamID == vstBypassParameterId)
                        setBypassed (static_cast<float> (value) != 0.0f);
                   #if JUCE_VST3_EMULATE_MIDI_CC_WITH_PARAMETERS
                    else if (juceVST3EditController->isMidiControllerParamID (vstParamID))
                        addParameterChangeToMidiBuffer (offsetSamples, vstParamID, value);
                   #endif
                    else
                    {
                        const int index = getJuceIndexForVSTParamID (vstParamID);
                        if (isPositiveAndBelow (index, pluginInstance->getNumParameters()))
                            pluginInstance->setParameter (index, static_cast<float> (value));
                    }
                }
            }
        }
    }

    void addParameterChangeToMidiBuffer (const Steinberg::int32 offsetSamples, const Vst::ParamID id, const double value)
    {
        // If the parameter is mapped to a MIDI CC message then insert it into the midiBuffer.
        int channel, ctrlNumber;

        if (juceVST3EditController->getMidiControllerForParameter (id, channel, ctrlNumber))
        {
            if (ctrlNumber == Vst::kAfterTouch)
                midiBuffer.addEvent (MidiMessage::channelPressureChange (channel,
                                                                         jlimit (0, 127, (int) (value * 128.0))), offsetSamples);
            else if (ctrlNumber == Vst::kPitchBend)
                midiBuffer.addEvent (MidiMessage::pitchWheel (channel,
                                                              jlimit (0, 0x3fff, (int) (value * 0x4000))), offsetSamples);
            else
                midiBuffer.addEvent (MidiMessage::controllerEvent (channel,
                                                                   jlimit (0, 127, ctrlNumber),
                                                                   jlimit (0, 127, (int) (value * 128.0))), offsetSamples);
        }
    }

    tresult PLUGIN_API process (Vst::ProcessData& data) override
    {

        if (pluginInstance == nullptr)
            return kResultFalse;

        if ((processSetup.symbolicSampleSize == Vst::kSample64) != pluginInstance->isUsingDoublePrecision())
            return kResultFalse;

        if (data.processContext != nullptr)
            processContext = *data.processContext;
        else
            zerostruct (processContext);

        midiBuffer.clear();

       #if JucePlugin_WantsMidiInput
        if (data.inputEvents != nullptr)
            MidiEventList::toMidiBuffer (midiBuffer, *data.inputEvents);
       #endif

        if (getHostType().isWavelab())
        {
            const int numInputChans  = (data.inputs  != nullptr && data.inputs[0].channelBuffers32 != nullptr)  ? (int) data.inputs[0].numChannels  : 0;
            const int numOutputChans = (data.outputs != nullptr && data.outputs[0].channelBuffers32 != nullptr) ? (int) data.outputs[0].numChannels : 0;

            if ((pluginInstance->getTotalNumInputChannels() + pluginInstance->getTotalNumOutputChannels()) > 0
                 && (numInputChans + numOutputChans) == 0)
                return kResultFalse;
        }

        if      (processSetup.symbolicSampleSize == Vst::kSample32) processAudio<float>  (data, channelListFloat);
        else if (processSetup.symbolicSampleSize == Vst::kSample64) processAudio<double> (data, channelListDouble);
        else jassertfalse;

       #if JucePlugin_ProducesMidiOutput
        if (data.outputEvents != nullptr)
            MidiEventList::toEventList (*data.outputEvents, midiBuffer);
       #endif

        return kResultTrue;
    }

private:
    //==============================================================================
    Atomic<int> refCount;

    AudioProcessor* pluginInstance;
    ComSmartPtr<Vst::IHostApplication> host;
    ComSmartPtr<JuceAudioProcessor> comPluginInstance;
    ComSmartPtr<JuceVST3EditController> juceVST3EditController;

    /**
        Since VST3 does not provide a way of knowing the buffer size and sample rate at any point,
        this object needs to be copied on every call to process() to be up-to-date...
    */
    Vst::ProcessContext processContext;
    Vst::ProcessSetup processSetup;

    MidiBuffer midiBuffer;
    Array<float*> channelListFloat;
    Array<double*> channelListDouble;

    AudioProcessor::AudioBusArrangement currentBusState;
    bool isMidiInputBusEnabled, isMidiOutputBusEnabled;
    PluginBusUtilities busUtils;

    ScopedJuceInitialiser_GUI libraryInitialiser;

   #if ! JUCE_FORCE_USE_LEGACY_PARAM_IDS
    bool usingManagedParameter;
    Array<Vst::ParamID> vstParamIDs;
    HashMap<int32, int> paramMap;
   #endif
    Vst::ParamID vstBypassParameterId;

    static const char* kJucePrivateDataIdentifier;

    //==============================================================================
    template <typename FloatType>
    void processAudio (Vst::ProcessData& data, Array<FloatType*>& channelList)
    {
        int totalInputChans = 0;

        const int plugInInputChannels  = pluginInstance->getTotalNumInputChannels();
        const int plugInOutputChannels = pluginInstance->getTotalNumOutputChannels();

        if (data.inputs != nullptr)
        {
            for (int bus = 0; bus < data.numInputs && totalInputChans < plugInInputChannels; ++bus)
            {
                if (FloatType** const busChannels = getPointerForAudioBus<FloatType> (data.inputs[bus]))
                {
                    const int numChans = jmin ((int) data.inputs[bus].numChannels, plugInInputChannels - totalInputChans);

                    for (int i = 0; i < numChans; ++i)
                        if (busChannels[i] != nullptr)
                            channelList.set (totalInputChans++, busChannels[i]);
                }
            }
        }

        int totalOutputChans = 0;

        if (data.outputs != nullptr)
        {
            for (int bus = 0; bus < data.numOutputs && totalOutputChans < plugInOutputChannels; ++bus)
            {
                if (FloatType** const busChannels = getPointerForAudioBus<FloatType> (data.outputs[bus]))
                {
                    const int numChans = jmin ((int) data.outputs[bus].numChannels, plugInOutputChannels - totalOutputChans);

                    for (int i = 0; i < numChans; ++i)
                    {
                        if (busChannels[i] != nullptr)
                        {
                            if (totalOutputChans >= totalInputChans)
                            {
                                FloatVectorOperations::clear (busChannels[i], data.numSamples);
                                channelList.set (totalOutputChans, busChannels[i]);
                            }

                            ++totalOutputChans;
                        }
                    }
                }
            }
        }

        AudioBuffer<FloatType> buffer;

        if (int totalChans = jmax (totalOutputChans, totalInputChans))
            buffer.setDataToReferTo (channelList.getRawDataPointer(), totalChans, (int) data.numSamples);

        {
            const ScopedLock sl (pluginInstance->getCallbackLock());

            pluginInstance->setNonRealtime (data.processMode == Vst::kOffline);

            if (data.inputParameterChanges != nullptr)
                processParameterChanges (*data.inputParameterChanges);

           #if JUCE_DEBUG && ! JucePlugin_ProducesMidiOutput
            const int numMidiEventsComingIn = midiBuffer.getNumEvents ();
           #endif

            if (pluginInstance->isSuspended())
            {
                buffer.clear();
            }
            else
            {
                if (totalInputChans == pluginInstance->getTotalNumInputChannels()
                 && totalOutputChans == pluginInstance->getTotalNumOutputChannels())
                {
                    if (isBypassed())
                        pluginInstance->processBlockBypassed (buffer, midiBuffer);
                    else
                        pluginInstance->processBlock (buffer, midiBuffer);
                }
            }

           #if JUCE_DEBUG && (! JucePlugin_ProducesMidiOutput)
            /*  This assertion is caused when you've added some events to the
                midiMessages array in your processBlock() method, which usually means
                that you're trying to send them somewhere. But in this case they're
                getting thrown away.

                If your plugin does want to send MIDI messages, you'll need to set
                the JucePlugin_ProducesMidiOutput macro to 1 in your
                JucePluginCharacteristics.h file.

                If you don't want to produce any MIDI output, then you should clear the
                midiMessages array at the end of your processBlock() method, to
                indicate that you don't want any of the events to be passed through
                to the output.
            */
            jassert (midiBuffer.getNumEvents() <= numMidiEventsComingIn);
           #endif
        }

        if (data.outputs != nullptr)
        {
            int outChanIndex = 0;

            for (int bus = 0; bus < data.numOutputs; ++bus)
            {
                if (FloatType** const busChannels = getPointerForAudioBus<FloatType> (data.outputs[bus]))
                {
                    const int numChans = (int) data.outputs[bus].numChannels;

                    for (int i = 0; i < numChans; ++i)
                    {
                        if (outChanIndex < totalInputChans && busChannels[i] != nullptr)
                            FloatVectorOperations::copy (busChannels[i], buffer.getReadPointer (outChanIndex), (int) data.numSamples);
                        else if (outChanIndex >= totalOutputChans && busChannels[i] != nullptr)
                            FloatVectorOperations::clear (busChannels[i], (int) data.numSamples);

                        ++outChanIndex;
                    }
                }
            }
        }
    }

    //==============================================================================
    template <typename FloatType>
    void allocateChannelLists (Array<FloatType*>& channelList)
    {
        channelList.clearQuick();
        channelList.insertMultiple (0, nullptr, 128);
    }

    template <typename FloatType>
    static FloatType** getPointerForAudioBus (Vst::AudioBusBuffers& data) noexcept
    {
        return AudioBusPointerHelper<FloatType>::impl (data);
    }

    //==============================================================================
    enum InternalParameters
    {
        paramPreset = 'prst'
    };

    void preparePlugin (double sampleRate, int bufferSize)
    {
        AudioProcessor& p = getPluginInstance();

        p.setRateAndBufferSizeDetails (sampleRate, bufferSize);
        p.prepareToPlay (sampleRate, bufferSize);
    }

    //==============================================================================
   #if JUCE_FORCE_USE_LEGACY_PARAM_IDS
    inline Vst::ParamID getVSTParamIDForIndex (int paramIndex) const noexcept   { return static_cast<Vst::ParamID> (paramIndex); }
    inline int getJuceIndexForVSTParamID (Vst::ParamID paramID) const noexcept  { return static_cast<int> (paramID); }
   #else
    void cacheParameterIDs()
    {
        const int numParameters = pluginInstance->getNumParameters();
        usingManagedParameter = (pluginInstance->getParameters().size() == numParameters);

        vstBypassParameterId = static_cast<Vst::ParamID> (usingManagedParameter ? kJuceVST3BypassParamID : numParameters);

        for (int i = 0; i < numParameters; ++i)
        {
            const Vst::ParamID paramID = JuceVST3EditController::generateVSTParamIDForIndex (pluginInstance, i);

            vstParamIDs.add (paramID);
            paramMap.set (static_cast<int32> (paramID), i);
        }
    }

    inline Vst::ParamID getVSTParamIDForIndex (int paramIndex) const noexcept
    {
        return usingManagedParameter ? vstParamIDs.getReference (paramIndex)
                                     : static_cast<Vst::ParamID> (paramIndex);
    }

    inline int getJuceIndexForVSTParamID (Vst::ParamID paramID) const noexcept
    {
        return usingManagedParameter ? paramMap[static_cast<int32> (paramID)]
                                     : static_cast<int> (paramID);
    }
   #endif

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JuceVST3Component)
};

#if JucePlugin_Build_VST3 && JUCE_VST3_CAN_REPLACE_VST2
 Steinberg::FUID getJuceVST3ComponentIID();
 Steinberg::FUID getJuceVST3ComponentIID()   { return JuceVST3Component::iid; }
#endif

const char* JuceVST3Component::kJucePrivateDataIdentifier = "JUCEPrivateData";

//==============================================================================
#if JUCE_MSVC
 #pragma warning (push, 0)
 #pragma warning (disable: 4310)
#elif JUCE_CLANG
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wall"
#endif

DECLARE_CLASS_IID (JuceAudioProcessor, 0x0101ABAB, 0xABCDEF01, JucePlugin_ManufacturerCode, JucePlugin_PluginCode)
DEF_CLASS_IID (JuceAudioProcessor)

#if JUCE_VST3_CAN_REPLACE_VST2
 // NB: Nasty old-fashioned code in here because it's copied from the Steinberg example code.
 static FUID getFUIDForVST2ID (bool forControllerUID)
 {
     char uidString[33];

     const int vstfxid = (('V' << 16) | ('S' << 8) | (forControllerUID ? 'E' : 'T'));
     char vstfxidStr[7] = { 0 };
     sprintf (vstfxidStr, "%06X", vstfxid);
     strcpy (uidString, vstfxidStr);

     char uidStr[9] = { 0 };
     sprintf (uidStr, "%08X", JucePlugin_VSTUniqueID);
     strcat (uidString, uidStr);

     char nameidStr[3] = { 0 };
     const size_t len = strlen (JucePlugin_Name);

     for (size_t i = 0; i <= 8; ++i)
     {
         juce::uint8 c = i < len ? static_cast<juce::uint8> (JucePlugin_Name[i]) : 0;

         if (c >= 'A' && c <= 'Z')
             c += 'a' - 'A';

         sprintf (nameidStr, "%02X", c);
         strcat (uidString, nameidStr);
     }

     FUID newOne;
     newOne.fromString (uidString);
     return newOne;
 }

 const Steinberg::FUID JuceVST3Component     ::iid (getFUIDForVST2ID (false));
 const Steinberg::FUID JuceVST3EditController::iid (getFUIDForVST2ID (true));

#else
 DECLARE_CLASS_IID (JuceVST3EditController, 0xABCDEF01, 0x1234ABCD, JucePlugin_ManufacturerCode, JucePlugin_PluginCode)
 DEF_CLASS_IID (JuceVST3EditController)

 DECLARE_CLASS_IID (JuceVST3Component, 0xABCDEF01, 0x9182FAEB, JucePlugin_ManufacturerCode, JucePlugin_PluginCode)
 DEF_CLASS_IID (JuceVST3Component)
#endif

#if JUCE_MSVC
 #pragma warning (pop)
#elif JUCE_CLANG
 #pragma clang diagnostic pop
#endif

//==============================================================================
bool initModule()
{
   #if JUCE_MAC
    initialiseMacVST();
   #endif

    return true;
}

bool shutdownModule()
{
    return true;
}

#undef JUCE_EXPORTED_FUNCTION

#if JUCE_WINDOWS
    extern "C" __declspec (dllexport) bool InitDll()   { return initModule(); }
    extern "C" __declspec (dllexport) bool ExitDll()   { return shutdownModule(); }
    #define JUCE_EXPORTED_FUNCTION

#else
    #define JUCE_EXPORTED_FUNCTION extern "C" __attribute__ ((visibility ("default")))

    CFBundleRef globalBundleInstance = nullptr;
    juce::uint32 numBundleRefs = 0;
    juce::Array<CFBundleRef> bundleRefs;

    enum { MaxPathLength = 2048 };
    char modulePath[MaxPathLength] = { 0 };
    void* moduleHandle = nullptr;

    JUCE_EXPORTED_FUNCTION bool bundleEntry (CFBundleRef ref)
    {
        if (ref != nullptr)
        {
            ++numBundleRefs;
            CFRetain (ref);

            bundleRefs.add (ref);

            if (moduleHandle == nullptr)
            {
                globalBundleInstance = ref;
                moduleHandle = ref;

                CFURLRef tempURL = CFBundleCopyBundleURL (ref);
                CFURLGetFileSystemRepresentation (tempURL, true, (UInt8*) modulePath, MaxPathLength);
                CFRelease (tempURL);
            }
        }

        return initModule();
    }

    JUCE_EXPORTED_FUNCTION bool bundleExit()
    {
        if (shutdownModule())
        {
            if (--numBundleRefs == 0)
            {
                for (int i = 0; i < bundleRefs.size(); ++i)
                    CFRelease (bundleRefs.getUnchecked (i));

                bundleRefs.clear();
            }

            return true;
        }

        return false;
    }
#endif

//==============================================================================
/** This typedef represents VST3's createInstance() function signature */
typedef FUnknown* (*CreateFunction) (Vst::IHostApplication*);

static FUnknown* createComponentInstance (Vst::IHostApplication* host)
{
    return (Vst::IAudioProcessor*) new JuceVST3Component (host);
}

static FUnknown* createControllerInstance (Vst::IHostApplication* host)
{
    return (Vst::IEditController*) new JuceVST3EditController (host);
}

//==============================================================================
class JucePluginFactory;
static JucePluginFactory* globalFactory = nullptr;

//==============================================================================
class JucePluginFactory : public IPluginFactory3
{
public:
    JucePluginFactory()
        : refCount (1),
          factoryInfo (JucePlugin_Manufacturer, JucePlugin_ManufacturerWebsite,
                       JucePlugin_ManufacturerEmail, Vst::kDefaultFactoryFlags)
    {
    }

    virtual ~JucePluginFactory()
    {
        if (globalFactory == this)
            globalFactory = nullptr;
    }

    //==============================================================================
    bool registerClass (const PClassInfo2& info, CreateFunction createFunction)
    {
        if (createFunction == nullptr)
        {
            jassertfalse;
            return false;
        }

        ClassEntry* entry = classes.add (new ClassEntry (info, createFunction));
        entry->infoW.fromAscii (info);

        return true;
    }

    bool isClassRegistered (const FUID& cid) const
    {
        for (int i = 0; i < classes.size(); ++i)
            if (classes.getUnchecked (i)->infoW.cid == cid)
                return true;

        return false;
    }

    //==============================================================================
    JUCE_DECLARE_VST3_COM_REF_METHODS

    tresult PLUGIN_API queryInterface (const TUID targetIID, void** obj) override
    {
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, IPluginFactory3)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, IPluginFactory2)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, IPluginFactory)
        TEST_FOR_AND_RETURN_IF_VALID (targetIID, FUnknown)

        jassertfalse; // Something new?
        *obj = nullptr;
        return kNotImplemented;
    }

    //==============================================================================
    Steinberg::int32 PLUGIN_API countClasses() override
    {
        return (Steinberg::int32) classes.size();
    }

    tresult PLUGIN_API getFactoryInfo (PFactoryInfo* info) override
    {
        if (info == nullptr)
            return kInvalidArgument;

        memcpy (info, &factoryInfo, sizeof (PFactoryInfo));
        return kResultOk;
    }

    tresult PLUGIN_API getClassInfo (Steinberg::int32 index, PClassInfo* info) override
    {
        return getPClassInfo<PClassInfo> (index, info);
    }

    tresult PLUGIN_API getClassInfo2 (Steinberg::int32 index, PClassInfo2* info) override
    {
        return getPClassInfo<PClassInfo2> (index, info);
    }

    tresult PLUGIN_API getClassInfoUnicode (Steinberg::int32 index, PClassInfoW* info) override
    {
        if (info != nullptr)
        {
            if (ClassEntry* entry = classes[(int) index])
            {
                memcpy (info, &entry->infoW, sizeof (PClassInfoW));
                return kResultOk;
            }
        }

        return kInvalidArgument;
    }

    tresult PLUGIN_API createInstance (FIDString cid, FIDString sourceIid, void** obj) override
    {
        *obj = nullptr;

        FUID sourceFuid = sourceIid;

        if (cid == nullptr || sourceIid == nullptr || ! sourceFuid.isValid())
        {
            jassertfalse; // The host you're running in has severe implementation issues!
            return kInvalidArgument;
        }

        TUID iidToQuery;
        sourceFuid.toTUID (iidToQuery);

        for (int i = 0; i < classes.size(); ++i)
        {
            const ClassEntry& entry = *classes.getUnchecked (i);

            if (doUIDsMatch (entry.infoW.cid, cid))
            {
                if (FUnknown* const instance = entry.createFunction (host))
                {
                    const FReleaser releaser (instance);

                    if (instance->queryInterface (iidToQuery, obj) == kResultOk)
                        return kResultOk;
                }

                break;
            }
        }

        return kNoInterface;
    }

    tresult PLUGIN_API setHostContext (FUnknown* context) override
    {
        host.loadFrom (context);

        if (host != nullptr)
        {
            Vst::String128 name;
            host->getName (name);

            return kResultTrue;
        }

        return kNotImplemented;
    }

private:
    //==============================================================================
    ScopedJuceInitialiser_GUI libraryInitialiser;
    Atomic<int> refCount;
    const PFactoryInfo factoryInfo;
    ComSmartPtr<Vst::IHostApplication> host;

    //==============================================================================
    struct ClassEntry
    {
        ClassEntry() noexcept  : createFunction (nullptr), isUnicode (false) {}

        ClassEntry (const PClassInfo2& info, CreateFunction fn) noexcept
            : info2 (info), createFunction (fn), isUnicode (false) {}

        PClassInfo2 info2;
        PClassInfoW infoW;
        CreateFunction createFunction;
        bool isUnicode;

    private:
        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ClassEntry)
    };

    OwnedArray<ClassEntry> classes;

    //==============================================================================
    template<class PClassInfoType>
    tresult PLUGIN_API getPClassInfo (Steinberg::int32 index, PClassInfoType* info)
    {
        if (info != nullptr)
        {
            zerostruct (*info);

            if (ClassEntry* entry = classes[(int) index])
            {
                if (entry->isUnicode)
                    return kResultFalse;

                memcpy (info, &entry->info2, sizeof (PClassInfoType));
                return kResultOk;
            }
        }

        jassertfalse;
        return kInvalidArgument;
    }

    //==============================================================================
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (JucePluginFactory)
};

} // juce namespace

//==============================================================================
#ifndef JucePlugin_Vst3ComponentFlags
 #if JucePlugin_IsSynth
  #define JucePlugin_Vst3ComponentFlags Vst::kSimpleModeSupported
 #else
  #define JucePlugin_Vst3ComponentFlags 0
 #endif
#endif

#ifndef JucePlugin_Vst3Category
 #if JucePlugin_IsSynth
  #define JucePlugin_Vst3Category Vst::PlugType::kInstrumentSynth
 #else
  #define JucePlugin_Vst3Category Vst::PlugType::kFx
 #endif
#endif

//==============================================================================
// The VST3 plugin entry point.
JUCE_EXPORTED_FUNCTION IPluginFactory* PLUGIN_API GetPluginFactory()
{
    JUCE_DECLARE_WRAPPER_TYPE (wrapperType_VST3);

   #if JUCE_WINDOWS
    // Cunning trick to force this function to be exported. Life's too short to
    // faff around creating .def files for this kind of thing.
    #pragma comment(linker, "/EXPORT:" __FUNCTION__ "=" __FUNCDNAME__)
   #endif

    if (globalFactory == nullptr)
    {
        globalFactory = new JucePluginFactory();

        static const PClassInfo2 componentClass (JuceVST3Component::iid,
                                                 PClassInfo::kManyInstances,
                                                 kVstAudioEffectClass,
                                                 JucePlugin_Name,
                                                 JucePlugin_Vst3ComponentFlags,
                                                 JucePlugin_Vst3Category,
                                                 JucePlugin_Manufacturer,
                                                 JucePlugin_VersionString,
                                                 kVstVersionString);

        globalFactory->registerClass (componentClass, createComponentInstance);

        static const PClassInfo2 controllerClass (JuceVST3EditController::iid,
                                                  PClassInfo::kManyInstances,
                                                  kVstComponentControllerClass,
                                                  JucePlugin_Name,
                                                  JucePlugin_Vst3ComponentFlags,
                                                  JucePlugin_Vst3Category,
                                                  JucePlugin_Manufacturer,
                                                  JucePlugin_VersionString,
                                                  kVstVersionString);

        globalFactory->registerClass (controllerClass, createControllerInstance);
    }
    else
    {
        globalFactory->addRef();
    }

    return dynamic_cast<IPluginFactory*> (globalFactory);
}

#endif //JucePlugin_Build_VST3