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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// This file is part of Nestopia.
//
// Nestopia is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Nestopia 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.
//
// You should have received a copy of the GNU General Public License
// along with Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
#ifndef NST_SYSTEM_TIMER_H
#define NST_SYSTEM_TIMER_H
#pragma once
#include "NstMain.hpp"
namespace Nestopia
{
namespace System
{
class Timer
{
public:
typedef qaword Value;
enum Type
{
MULTIMEDIA,
PERFORMANCE
};
explicit Timer(Type=MULTIMEDIA);
bool Reset(Type);
Value Elapsed() const;
bool Wait(Value,Value);
private:
static inline bool QueryPf(Value&);
enum
{
THRESHOLD = 1,
CHECKPOINT = 60,
SUSPICIOUS = 3,
MIN_PF_FRQ = 1000,
MAX_PF_FRQ = 0x10000000
};
struct Settings
{
Settings();
~Settings();
Value pfFrequency;
uint period;
};
Value start;
Value frequency;
Value checkPoint;
Type type;
uint threshold;
uint giveup;
static const Settings settings;
public:
static bool HasPerformanceCounter()
{
return settings.pfFrequency != 0;
}
static Value GetPerformanceCounterFrequency()
{
return settings.pfFrequency;
}
Type GetType() const
{
return type;
}
Value GetFrequency() const
{
return frequency;
}
};
}
}
#endif
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