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System: Implement variable emulation speed

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This commit is contained in:
Connor McLaughlin
2020-02-11 12:02:42 +09:00
parent a81a0c0f21
commit 70fe43a3ec
6 changed files with 35 additions and 6 deletions
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22
src/core/system.cpp
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@ -209,6 +209,8 @@ void System::InitializeComponents()
m_timers->Initialize(this, m_interrupt_controller.get(), m_gpu.get());
m_spu->Initialize(this, m_dma.get(), m_interrupt_controller.get());
m_mdec->Initialize(this, m_dma.get());
UpdateThrottlePeriod();
}
void System::DestroyComponents()
@ -402,6 +404,20 @@ void System::RunFrame()
UpdatePerformanceCounters();
}
void System::SetThrottleFrequency(float frequency)
{
m_throttle_frequency = frequency;
UpdateThrottlePeriod();
}
void System::UpdateThrottlePeriod()
{
m_throttle_period = static_cast<s32>(1000000000.0 / static_cast<double>(m_throttle_frequency) /
static_cast<double>(GetSettings().emulation_speed));
m_last_throttle_time = 0;
m_throttle_timer.Reset();
}
void System::Throttle()
{
// Allow variance of up to 40ms either way.
@ -413,15 +429,15 @@ void System::Throttle()
// Use unsigned for defined overflow/wrap-around.
const u64 time = static_cast<u64>(m_throttle_timer.GetTimeNanoseconds());
const s64 sleep_time = static_cast<s64>(m_last_throttle_time - time);
if (std::abs(sleep_time) >= MAX_VARIANCE_TIME)
if (sleep_time < -MAX_VARIANCE_TIME)
{
#ifndef _DEBUG
// Don't display the slow messages in debug, it'll always be slow...
// Limit how often the messages are displayed.
if (m_speed_lost_time_timestamp.GetTimeSeconds() >= 1.0f)
{
Log_WarningPrintf("System too %s, lost %.2f ms", sleep_time < 0 ? "slow" : "fast",
static_cast<double>(std::abs(sleep_time) - MAX_VARIANCE_TIME) / 1000000.0);
Log_WarningPrintf("System too slow, lost %.2f ms",
static_cast<double>(-sleep_time - MAX_VARIANCE_TIME) / 1000000.0);
m_speed_lost_time_timestamp.Reset();
}
#endif