project64/Source/Project64-core/N64System/SpeedLimiter.cpp

111 lines
2.3 KiB
C++

#include "stdafx.h"
#include "Project64-core/N64System/SpeedLimiter.h"
#include <Common/Util.h>
const uint32_t CSpeedLimiter::m_DefaultSpeed = 60;
CSpeedLimiter::CSpeedLimiter() :
m_Frames(0),
m_Speed(m_DefaultSpeed),
m_BaseSpeed(m_DefaultSpeed)
{
}
CSpeedLimiter::~CSpeedLimiter()
{
}
void CSpeedLimiter::SetHertz(uint32_t Hertz)
{
m_Speed = Hertz;
m_BaseSpeed = Hertz;
FixSpeedRatio();
}
void CSpeedLimiter::FixSpeedRatio()
{
m_MicroSecondsPerFrame = 1000000 / m_Speed;
m_Frames = 0;
}
bool CSpeedLimiter::Timer_Process(uint32_t * FrameRate)
{
m_Frames += 1;
HighResTimeStamp CurrentTime;
CurrentTime.SetToNow();
// Calculate time that should have elapsed for this frame
uint64_t LastTime = m_LastTime.GetMicroSeconds(), CurrentTimeValue = CurrentTime.GetMicroSeconds();
if (LastTime == 0)
{
m_Frames = 0;
m_LastTime = CurrentTime;
return true;
}
uint64_t CalculatedTime = LastTime + (m_MicroSecondsPerFrame * m_Frames);
if (CurrentTimeValue < CalculatedTime)
{
int32_t time = (int)(CalculatedTime - CurrentTimeValue);
if (time > 0)
{
pjutil::Sleep((time / 1000) + 1);
}
// Refresh current time
CurrentTime.SetToNow();
CurrentTimeValue = CurrentTime.GetMicroSeconds();
}
if (CurrentTimeValue - LastTime >= 1000000)
{
// Output FPS
if (FrameRate != nullptr) { *FrameRate = m_Frames; }
m_Frames = 0;
m_LastTime = CurrentTime;
return true;
}
return false;
}
void CSpeedLimiter::AlterSpeed( const ESpeedChange SpeedChange )
{
int32_t SpeedFactor = 1;
if (SpeedChange == DECREASE_SPEED) { SpeedFactor = -1; }
if (m_Speed >= m_DefaultSpeed)
{
m_Speed += 10 * SpeedFactor;
}
else if (m_Speed >= 15)
{
m_Speed += 5 * SpeedFactor;
}
else if ((m_Speed > 1 && SpeedChange == DECREASE_SPEED) || SpeedChange == INCREASE_SPEED)
{
m_Speed += 1 * SpeedFactor;
}
SpeedChanged(m_Speed);
FixSpeedRatio();
}
void CSpeedLimiter::SetSpeed(int Speed)
{
if (Speed < 1)
{
Speed = 1;
}
m_Speed = Speed;
SpeedChanged(m_Speed);
FixSpeedRatio();
}
int CSpeedLimiter::GetSpeed(void) const
{
return m_Speed;
}
int CSpeedLimiter::GetBaseSpeed(void) const
{
return m_BaseSpeed;
}