126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/****************************************************************************
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* *
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* Project64 - A Nintendo 64 emulator. *
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* http://www.pj64-emu.com/ *
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* Copyright (C) 2012 Project64. All rights reserved. *
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* *
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* License: *
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* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html *
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* *
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****************************************************************************/
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#include "stdafx.h"
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#include "Project64-Core/N64System/SpeedLimiterClass.h"
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#include <Common/Util.h>
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// ---------------------------------------------------
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const uint32_t CSpeedLimiter::m_DefaultSpeed = 60;
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// ---------------------------------------------------
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CSpeedLimiter::CSpeedLimiter() :
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m_Frames(0),
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m_Speed(m_DefaultSpeed),
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m_BaseSpeed(m_DefaultSpeed)
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{
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}
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CSpeedLimiter::~CSpeedLimiter()
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{
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}
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void CSpeedLimiter::SetHertz(uint32_t Hertz)
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{
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m_Speed = Hertz;
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m_BaseSpeed = Hertz;
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FixSpeedRatio();
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}
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void CSpeedLimiter::FixSpeedRatio()
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{
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m_MicroSecondsPerFrame = 1000000 / m_Speed;
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m_Frames = 0;
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}
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bool CSpeedLimiter::Timer_Process(uint32_t * FrameRate)
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{
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m_Frames += 1;
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HighResTimeStamp CurrentTime;
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CurrentTime.SetToNow();
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/* Calculate time that should of elapsed for this frame */
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uint64_t LastTime = m_LastTime.GetMicroSeconds(), CurrentTimeValue = CurrentTime.GetMicroSeconds();
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if (LastTime == 0)
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{
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m_Frames = 0;
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m_LastTime = CurrentTime;
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return true;
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}
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uint64_t CalculatedTime = LastTime + (m_MicroSecondsPerFrame * m_Frames);
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if (CurrentTimeValue < CalculatedTime)
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{
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int32_t time = (int)(CalculatedTime - CurrentTimeValue);
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if (time > 0)
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{
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pjutil::Sleep((time / 1000) + 1);
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}
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/* Refresh current time */
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CurrentTime.SetToNow();
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CurrentTimeValue = CurrentTime.GetMicroSeconds();
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}
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if (CurrentTimeValue - LastTime >= 1000000)
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{
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/* Output FPS */
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if (FrameRate != NULL) { *FrameRate = m_Frames; }
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m_Frames = 0;
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m_LastTime = CurrentTime;
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return true;
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}
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return false;
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}
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void CSpeedLimiter::AlterSpeed( const ESpeedChange SpeedChange )
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{
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int32_t SpeedFactor = 1;
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if (SpeedChange == DECREASE_SPEED) { SpeedFactor = -1; }
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if (m_Speed >= m_DefaultSpeed)
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{
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m_Speed += 10 * SpeedFactor;
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}
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else if (m_Speed >= 15)
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{
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m_Speed += 5 * SpeedFactor;
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}
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else if ((m_Speed > 1 && SpeedChange == DECREASE_SPEED) || SpeedChange == INCREASE_SPEED)
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{
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m_Speed += 1 * SpeedFactor;
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}
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SpeedChanged(m_Speed);
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FixSpeedRatio();
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}
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void CSpeedLimiter::SetSpeed(int Speed)
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{
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if (Speed < 1)
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{
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Speed = 1;
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}
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m_Speed = Speed;
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SpeedChanged(m_Speed);
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FixSpeedRatio();
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}
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int CSpeedLimiter::GetSpeed(void) const
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{
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return m_Speed;
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}
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int CSpeedLimiter::GetBaseSpeed(void) const
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{
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return m_BaseSpeed;
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}
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