AudioEngineSubsystem.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "AudioDeviceManager.h"
#include "Subsystem.h"
#include "SubsystemCollection.h"
#include "AudioEngineSubsystem.generated.h"
 
// Forward Declarations 
class FAudioDevice;
namespace Audio
{
    class FMixerDevice;
    class FMixerSourceManager;
}
 
UCLASS(MinimalAPI)
class UAudioSubsystemCollectionRoot final : public UObject
{
    GENERATED_BODY()
 
public:
 
    void inline SetAudioDeviceID(Audio::FDeviceId DeviceID) { OwningDeviceID = DeviceID; }
 
    Audio::FDeviceId GetAudioDeviceID() const { return OwningDeviceID; }
 
protected:
 
    Audio::FDeviceId OwningDeviceID = Audio::FDeviceId(INDEX_NONE);
};
 
UCLASS(Abstract, MinimalAPI)
class UAudioEngineSubsystem : public UDynamicSubsystem
{
    GENERATED_BODY()
 
public:
 
    ENGINE_API UAudioEngineSubsystem();
 
    virtual void Update() {}
 
    ENGINE_API virtual Audio::FDeviceId GetAudioDeviceId() const final;
 
    ENGINE_API virtual FAudioDeviceHandle GetAudioDeviceHandle() const final;
 
    ENGINE_API virtual Audio::FMixerSourceManager* GetMutableSourceManager() final;
 
    ENGINE_API virtual const Audio::FMixerSourceManager* GetSourceManager() const final;
 
    ENGINE_API virtual Audio::FMixerDevice* GetMutableMixerDevice() final;
 
    ENGINE_API virtual const Audio::FMixerDevice* GetMixerDevice() const final;
};
 
class FAudioSubsystemCollection : public FSubsystemCollection<UAudioEngineSubsystem>
{
public:
 
    template<class ArgType>
    void ForEachSubsystem(TFunctionRef<bool(ArgType*)> InFunction) const
    {
        UClass* ArgClass = nullptr;
        if constexpr (TIsIInterface<ArgType>::Value)
        {
            ArgClass = ArgType::UClassType::StaticClass();
        }
        else
        {
            ArgClass = ArgType::StaticClass();
        }
 
        ForEachSubsystemOfClass(ArgClass, [Function=MoveTemp(InFunction)](USubsystem* Subsystem)
        {
            Function(CastChecked<ArgType>(Subsystem));
        });
    }
};