project64/Source/Project64/N64 System/Speed Limitor Class.cpp

111 lines
2.7 KiB
C++

/****************************************************************************
* *
* Project 64 - A Nintendo 64 emulator. *
* http://www.pj64-emu.com/ *
* Copyright (C) 2012 Project64. All rights reserved. *
* *
* License: *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html *
* *
****************************************************************************/
#include "stdafx.h"
#pragma comment(lib, "winmm.lib")
CSpeedLimitor::CSpeedLimitor(void)
{
m_Frames = 0;
m_LastTime = 0;
m_Speed = 60;
m_BaseSpeed = 60;
m_Ratio = 1000.0F / (float)m_Speed;
TIMECAPS Caps;
timeGetDevCaps(&Caps, sizeof(Caps));
if (timeBeginPeriod(Caps.wPeriodMin) == TIMERR_NOCANDO) {
g_Notify->DisplayError("Error during timer begin");
}
}
CSpeedLimitor::~CSpeedLimitor(void) {
TIMECAPS Caps;
timeGetDevCaps(&Caps, sizeof(Caps));
timeEndPeriod(Caps.wPeriodMin);
}
void CSpeedLimitor::SetHertz (DWORD Hertz ) {
m_Speed = Hertz;
m_BaseSpeed = Hertz;
FixSpeedRatio();
}
void CSpeedLimitor::FixSpeedRatio ( void )
{
m_Ratio = 1000.0f / static_cast<double>(m_Speed);
m_Frames = 0;
m_LastTime = timeGetTime();
}
bool CSpeedLimitor::Timer_Process (DWORD * FrameRate ) {
m_Frames += 1;
DWORD CurrentTime = timeGetTime();
/* Calculate time that should of elapsed for this frame */
double CalculatedTime = (double)m_LastTime + (m_Ratio * (double)m_Frames);
if ((double)CurrentTime < CalculatedTime) {
long time = (int)(CalculatedTime - (double)CurrentTime);
if (time > 0) {
Sleep(time);
}
/* Refresh current time */
CurrentTime = timeGetTime();
}
if (CurrentTime - m_LastTime >= 1000) {
/* Output FPS */
if (FrameRate != NULL) { *FrameRate = m_Frames; }
m_Frames = 0;
m_LastTime = CurrentTime;
return true;
} else {
return false;
}
}
void CSpeedLimitor::IncreaeSpeed ( void )
{
if (m_Speed >= 60)
{
m_Speed += 10;
}
else if (m_Speed >= 15)
{
m_Speed += 5;
}
else
{
m_Speed += 1;
}
SpeedChanged(m_Speed);
FixSpeedRatio();
}
void CSpeedLimitor::DecreaeSpeed ( void )
{
if (m_Speed > 60)
{
m_Speed -= 10;
}
else if (m_Speed > 15)
{
m_Speed -= 5;
}
else if (m_Speed > 1)
{
m_Speed -= 1;
}
SpeedChanged(m_Speed);
FixSpeedRatio();
}