// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

// This audio backend uses XAudio2 via XAUDIO2_DLL
// It works on Windows 8+, where it is included as an OS component.
// This backend is always compiled, but only available if running on Win8+

#pragma once

#include <memory>

#include "AudioCommon/SoundStream.h"
#include "Common/Event.h"

#ifdef _WIN32

struct StreamingVoiceContext;
struct IXAudio2;
struct IXAudio2MasteringVoice;

#endif

class XAudio2 final : public SoundStream
{
#ifdef _WIN32

private:
	class Releaser
	{
	public:
		template <typename R>
		void operator()(R* ptr)
		{
			ptr->Release();
		}
	};

	std::unique_ptr<IXAudio2, Releaser> m_xaudio2;
	std::unique_ptr<StreamingVoiceContext> m_voice_context;
	IXAudio2MasteringVoice *m_mastering_voice;

	Common::Event m_sound_sync_event;
	float m_volume;

	const bool m_cleanup_com;

	static HMODULE m_xaudio2_dll;
	static void *PXAudio2Create;

	static bool InitLibrary();

public:
	XAudio2();
	virtual ~XAudio2();

	bool Start() override;
	void Stop() override;

	void Update() override;
	void Clear(bool mute) override;
	void SetVolume(int volume) override;

	static bool isValid() { return InitLibrary(); }
#endif
};