dolphin/Source/Core/VideoCommon/AsyncRequests.h

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

#pragma once

#include <atomic>
#include <condition_variable>
#include <mutex>
#include <queue>

#include "Common/CommonTypes.h"

class AsyncRequests
{
public:
	struct Event
	{
		enum Type
		{
			EFB_POKE_COLOR,
			EFB_POKE_Z,
			EFB_PEEK_COLOR,
			EFB_PEEK_Z,
		} type;
		u64 time;

		union
		{
			struct
			{
				u16 x;
				u16 y;
				u32 data;
			} efb_poke;

			struct
			{
				u16 x;
				u16 y;
				u32* data;
			} efb_peek;
		};
	};

	AsyncRequests();

	void PullEvents()
	{
		if (!m_empty.load())
			PullEventsInternal();
	}
	void PushEvent(const Event& event, bool blocking = false);
	void SetEnable(bool enable);

	static AsyncRequests* GetInstance() { return &s_singleton; }

private:
	void PullEventsInternal();
	void HandleEvent(const Event& e);

	static AsyncRequests s_singleton;

	std::atomic<bool> m_empty;
	std::queue<Event> m_queue;
	std::mutex m_mutex;
	std::condition_variable m_cond;

	bool m_wake_me_up_again;
	bool m_enable;
};