81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
#include "stdafx.h"
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#pragma comment(lib, "winmm.lib")
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CSpeedLimitor::CSpeedLimitor(CNotification * const _Notify ) :
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_Notify(_Notify)
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{
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m_Frames = 0;
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m_LastTime = 0;
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m_Speed = 60;
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m_BaseSpeed = 60;
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m_Ratio = 1000.0F / (float)m_Speed;
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TIMECAPS Caps;
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timeGetDevCaps(&Caps, sizeof(Caps));
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if (timeBeginPeriod(Caps.wPeriodMin) == TIMERR_NOCANDO) {
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_Notify->DisplayError("Error during timer begin");
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}
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}
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CSpeedLimitor::~CSpeedLimitor(void) {
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TIMECAPS Caps;
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timeGetDevCaps(&Caps, sizeof(Caps));
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timeEndPeriod(Caps.wPeriodMin);
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}
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void CSpeedLimitor::SetHertz (DWORD Hertz ) {
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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 CSpeedLimitor::FixSpeedRatio ( void )
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{
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m_Ratio = 1000.0f / static_cast<double>(m_Speed);
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m_Frames = 0;
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m_LastTime = timeGetTime();
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}
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bool CSpeedLimitor::Timer_Process (DWORD * FrameRate ) {
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m_Frames += 1;
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DWORD CurrentTime = timeGetTime();
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/* Calculate time that should of elapsed for this frame */
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double CalculatedTime = (double)m_LastTime + (m_Ratio * (double)m_Frames);
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if ((double)CurrentTime < CalculatedTime) {
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long time = (int)(CalculatedTime - (double)CurrentTime);
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if (time > 0) {
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Sleep(time);
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}
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/* Refresh current time */
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CurrentTime = timeGetTime();
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}
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if (CurrentTime - m_LastTime >= 1000) {
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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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} else {
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return false;
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}
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}
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void CSpeedLimitor::IncreaeSpeed ( int Percent )
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{
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m_Speed += (DWORD)(m_BaseSpeed * ((float)Percent / 100));
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FixSpeedRatio();
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}
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void CSpeedLimitor::DecreaeSpeed ( int Percent )
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{
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ULONG Unit = (ULONG)(m_BaseSpeed * ((float)Percent / 100));
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if (m_Speed > Unit)
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{
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m_Speed -= Unit;
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FixSpeedRatio();
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}
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} |