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Allow specification of EE clock scale in arcadedef.

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This commit is contained in:
Jean-Philip Desjardins 2023-01-31 09:20:55 -05:00
parent 047aa16773
commit 00d53fe1f9
8 changed files with 39 additions and 10 deletions
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21
Source/PS2VM.cpp
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@ -174,6 +174,13 @@ void CPS2VM::DestroySoundHandler()
m_mailBox.SendCall([this]() { DestroySoundHandlerImpl(); }, true);
}
void CPS2VM::SetEeFrequencyScale(uint32 numerator, uint32 denominator)
{
m_eeFreqScaleNumerator = numerator;
m_eeFreqScaleDenominator = denominator;
ReloadFrameRateLimit();
}
void CPS2VM::ReloadFrameRateLimit()
{
uint32 frameRate = 60;
@ -184,7 +191,11 @@ void CPS2VM::ReloadFrameRateLimit()
bool limitFrameRate = CAppConfig::GetInstance().GetPreferenceBoolean(PREF_PS2_LIMIT_FRAMERATE);
m_frameLimiter.SetFrameRate(limitFrameRate ? frameRate : 0);
uint32 frameTicks = PS2::EE_CLOCK_FREQ / frameRate;
//At 1x scale, IOP runs 8 times slower than EE
uint32 eeFreqScaled = PS2::EE_CLOCK_FREQ * m_eeFreqScaleNumerator / m_eeFreqScaleDenominator;
m_iopTickStep = (m_eeTickStep / 8) * m_eeFreqScaleDenominator / m_eeFreqScaleNumerator;
uint32 frameTicks = eeFreqScaled / frameRate;
m_onScreenTicksTotal = frameTicks * 9 / 10;
m_vblankTicksTotal = frameTicks / 10;
}
@ -444,6 +455,8 @@ void CPS2VM::ResetVM()
CDROM0_SyncPath();
SetEeFrequencyScale(1, 1);
m_vblankTicks = m_onScreenTicksTotal;
m_inVblank = false;
@ -899,10 +912,8 @@ void CPS2VM::EmuThread()
}
}
//EE CPU is 8 times faster than the IOP CPU
static const int tickStep = 4800;
m_eeExecutionTicks += tickStep;
m_iopExecutionTicks += tickStep / 8;
m_eeExecutionTicks += m_eeTickStep;
m_iopExecutionTicks += m_iopTickStep;
UpdateEe();
UpdateIop();