Core: Added runahead support (1 to 10 frames)

Core/Console.cpp

@@ -720,6 +720,17 @@ void Console::RunSlaveCpu()
 	}
 }
 
+void Console::RunFrame()
+{
+	uint32_t frameCount = _ppu->GetFrameCount();
+	while(_ppu->GetFrameCount() == frameCount) {
+		_cpu->Exec();
+		if(_slave) {
+			RunSlaveCpu();
+		}
+	}
+}
+
 void Console::Run()
 {
 	Timer clockTimer;
@@ -729,7 +740,6 @@ void Console::Run()
 	double targetTime;
 	double lastFrameMin = 9999;
 	double lastFrameMax = 0;
-	uint32_t lastFrameNumber = -1;
 	double lastDelay = GetFrameDelay();
 
 	_runLock.Acquire();
@@ -753,131 +763,135 @@ void Console::Run()
 	bool crashed = false;
 	try {
 		while(true) {
-			_cpu->Exec();
-
-			if(_slave) {
-				RunSlaveCpu();
+			stringstream runAheadState;
+			bool useRunAhead = _settings->GetRunAheadFrames() > 0 && !_debugger && !_rewindManager->IsRewinding();
+			if(useRunAhead) {
+				RunFrameWithRunAhead(runAheadState);
+			} else {
+				RunFrame();
 			}
 
-			if(_ppu->GetFrameCount() != lastFrameNumber) {
-				_soundMixer->ProcessEndOfFrame();
-				if(_slave) {
-					_slave->_soundMixer->ProcessEndOfFrame();
-				}
+			_soundMixer->ProcessEndOfFrame();
+			if(_slave) {
+				_slave->_soundMixer->ProcessEndOfFrame();
+			}
 
-				if(_historyViewer) {
-					_historyViewer->ProcessEndOfFrame();
-				}
-				_rewindManager->ProcessEndOfFrame();
-				_settings->DisableOverclocking(_disableOcNextFrame || IsNsf());
-				_disableOcNextFrame = false;
+			if(_historyViewer) {
+				_historyViewer->ProcessEndOfFrame();
+			}
+			_rewindManager->ProcessEndOfFrame();
+			_settings->DisableOverclocking(_disableOcNextFrame || IsNsf());
+			_disableOcNextFrame = false;
 
-				//Update model (ntsc/pal) and get delay for next frame
-				UpdateNesModel(true);
-				double delay = GetFrameDelay();
+			//Update model (ntsc/pal) and get delay for next frame
+			UpdateNesModel(true);
+			double delay = GetFrameDelay();
 
-				if(_resetRunTimers || delay != lastDelay || (clockTimer.GetElapsedMS() - targetTime) > 300) {
-					//Reset the timers, this can happen in 3 scenarios:
-					//1) Target frame rate changed
-					//2) The console was reset/power cycled or the emulation was paused (with or without the debugger)
-					//3) As a satefy net, if we overshoot our target by over 300 milliseconds, the timer is reset, too.
-					//   This can happen when something slows the emulator down severely (or when breaking execution in VS when debugging Mesen itself, etc.)
-					clockTimer.Reset();
-					targetTime = 0;
+			if(_resetRunTimers || delay != lastDelay || (clockTimer.GetElapsedMS() - targetTime) > 300) {
+				//Reset the timers, this can happen in 3 scenarios:
+				//1) Target frame rate changed
+				//2) The console was reset/power cycled or the emulation was paused (with or without the debugger)
+				//3) As a satefy net, if we overshoot our target by over 300 milliseconds, the timer is reset, too.
+				//   This can happen when something slows the emulator down severely (or when breaking execution in VS when debugging Mesen itself, etc.)
+				clockTimer.Reset();
+				targetTime = 0;
 
-					_resetRunTimers = false;
-					lastDelay = delay;
-				}
+				_resetRunTimers = false;
+				lastDelay = delay;
+			}
 
-				targetTime += delay;
+			targetTime += delay;
 				
-				bool displayDebugInfo = _settings->CheckFlag(EmulationFlags::DisplayDebugInfo);
-				if(displayDebugInfo) {
-					double lastFrameTime = lastFrameTimer.GetElapsedMS();
-					lastFrameTimer.Reset();
-					frameDurations[frameDurationIndex] = lastFrameTime;
-					frameDurationIndex = (frameDurationIndex + 1) % 60;
+			bool displayDebugInfo = _settings->CheckFlag(EmulationFlags::DisplayDebugInfo);
+			if(displayDebugInfo) {
+				double lastFrameTime = lastFrameTimer.GetElapsedMS();
+				lastFrameTimer.Reset();
+				frameDurations[frameDurationIndex] = lastFrameTime;
+				frameDurationIndex = (frameDurationIndex + 1) % 60;
 
-					DisplayDebugInformation(lastFrameTime, lastFrameMin, lastFrameMax, frameDurations);
-					if(_slave) {
-						_slave->DisplayDebugInformation(lastFrameTime, lastFrameMin, lastFrameMax, frameDurations);
-					}
+				DisplayDebugInformation(lastFrameTime, lastFrameMin, lastFrameMax, frameDurations);
+				if(_slave) {
+					_slave->DisplayDebugInformation(lastFrameTime, lastFrameMin, lastFrameMax, frameDurations);
 				}
+			}
 
-				//When sleeping for a long time (e.g <= 25% speed), sleep in small chunks and check to see if we need to stop sleeping between each sleep call
-				while(targetTime - clockTimer.GetElapsedMS() > 50) {
-					clockTimer.WaitUntil(clockTimer.GetElapsedMS() + 40);
-					if(delay != GetFrameDelay() || _stop || _settings->NeedsPause() || _pauseCounter > 0) {
-						targetTime = 0;
-						break;
-					}
-				}
-
-				//Sleep until we're ready to start the next frame
-				clockTimer.WaitUntil(targetTime);
-
-				if(_pauseCounter > 0) {
-					//Need to temporarely pause the emu (to save/load a state, etc.)
-					_runLock.Release();
-
-					//Spin wait until we are allowed to start again
-					while(_pauseCounter > 0) { }
-
-					_runLock.Acquire();
-				}
-
-				if(_pauseOnNextFrameRequested) {
-					//Used by "Run Single Frame" option
-					_settings->SetFlags(EmulationFlags::Paused);
-					_pauseOnNextFrameRequested = false;
-				}
-
-				bool pausedRequired = _settings->NeedsPause();
-				if(pausedRequired && !_stop && !_settings->CheckFlag(EmulationFlags::DebuggerWindowEnabled)) {
-					_notificationManager->SendNotification(ConsoleNotificationType::GamePaused);
-
-					//Prevent audio from looping endlessly while game is paused
-					_soundMixer->StopAudio();
-					if(_slave) {
-						_slave->_soundMixer->StopAudio();
-					}
-
-					_runLock.Release();
-
-					PlatformUtilities::EnableScreensaver();
-					PlatformUtilities::RestoreTimerResolution();
-					while(pausedRequired && !_stop && !_settings->CheckFlag(EmulationFlags::DebuggerWindowEnabled)) {
-						//Sleep until emulation is resumed
-						std::this_thread::sleep_for(std::chrono::duration<int, std::milli>(30));
-						pausedRequired = _settings->NeedsPause();
-						_paused = true;
-					}
-					_paused = false;
-					
-					PlatformUtilities::DisableScreensaver();
-					_runLock.Acquire();
-					_notificationManager->SendNotification(ConsoleNotificationType::GameResumed);
-					lastFrameTimer.Reset();
-
-					//Reset the timer to avoid speed up after a pause
-					_resetRunTimers = true;
-				}
-
-				if(_settings->CheckFlag(EmulationFlags::UseHighResolutionTimer)) {
-					PlatformUtilities::EnableHighResolutionTimer();
-				} else {
-					PlatformUtilities::RestoreTimerResolution();
-				}
-
-				_systemActionManager->ProcessSystemActions();
-
-				lastFrameNumber = _ppu->GetFrameCount();
-
-				if(_stop) {
-					_stop = false;
+			//When sleeping for a long time (e.g <= 25% speed), sleep in small chunks and check to see if we need to stop sleeping between each sleep call
+			while(targetTime - clockTimer.GetElapsedMS() > 50) {
+				clockTimer.WaitUntil(clockTimer.GetElapsedMS() + 40);
+				if(delay != GetFrameDelay() || _stop || _settings->NeedsPause() || _pauseCounter > 0) {
+					targetTime = 0;
 					break;
 				}
 			}
+
+			//Sleep until we're ready to start the next frame
+			clockTimer.WaitUntil(targetTime);
+
+			if(useRunAhead) {
+				_settings->SetRunAheadFrameFlag(true);
+				LoadState(runAheadState);
+				_settings->SetRunAheadFrameFlag(false);
+			}
+
+			if(_pauseCounter > 0) {
+				//Need to temporarely pause the emu (to save/load a state, etc.)
+				_runLock.Release();
+
+				//Spin wait until we are allowed to start again
+				while(_pauseCounter > 0) { }
+
+				_runLock.Acquire();
+			}
+
+			if(_pauseOnNextFrameRequested) {
+				//Used by "Run Single Frame" option
+				_settings->SetFlags(EmulationFlags::Paused);
+				_pauseOnNextFrameRequested = false;
+			}
+
+			bool pausedRequired = _settings->NeedsPause();
+			if(pausedRequired && !_stop && !_settings->CheckFlag(EmulationFlags::DebuggerWindowEnabled)) {
+				_notificationManager->SendNotification(ConsoleNotificationType::GamePaused);
+
+				//Prevent audio from looping endlessly while game is paused
+				_soundMixer->StopAudio();
+				if(_slave) {
+					_slave->_soundMixer->StopAudio();
+				}
+
+				_runLock.Release();
+
+				PlatformUtilities::EnableScreensaver();
+				PlatformUtilities::RestoreTimerResolution();
+				while(pausedRequired && !_stop && !_settings->CheckFlag(EmulationFlags::DebuggerWindowEnabled)) {
+					//Sleep until emulation is resumed
+					std::this_thread::sleep_for(std::chrono::duration<int, std::milli>(30));
+					pausedRequired = _settings->NeedsPause();
+					_paused = true;
+				}
+				_paused = false;
+					
+				PlatformUtilities::DisableScreensaver();
+				_runLock.Acquire();
+				_notificationManager->SendNotification(ConsoleNotificationType::GameResumed);
+				lastFrameTimer.Reset();
+
+				//Reset the timer to avoid speed up after a pause
+				_resetRunTimers = true;
+			}
+
+			if(_settings->CheckFlag(EmulationFlags::UseHighResolutionTimer)) {
+				PlatformUtilities::EnableHighResolutionTimer();
+			} else {
+				PlatformUtilities::RestoreTimerResolution();
+			}
+
+			_systemActionManager->ProcessSystemActions();
+
+			if(_stop) {
+				_stop = false;
+				break;
+			}
 		}
 	} catch(const std::runtime_error &ex) {
 		crashed = true;
@@ -926,6 +940,26 @@ void Console::Run()
 	_notificationManager->SendNotification(ConsoleNotificationType::EmulationStopped);
 }
 
+void Console::RunFrameWithRunAhead(std::stringstream& runAheadState)
+{
+	uint32_t runAheadFrames = _settings->GetRunAheadFrames();
+	_settings->SetRunAheadFrameFlag(true);
+	//Run a single frame and save the state (no audio/video)
+	RunFrame();
+	SaveState(runAheadState);
+	while(runAheadFrames > 1) {
+		//Run extra frames if the requested run ahead frame count is higher than 1
+		runAheadFrames--;
+		RunFrame();
+	}
+	_apu->EndFrame();
+	_settings->SetRunAheadFrameFlag(false);
+
+	//Run one frame normally (with audio/video output)
+	RunFrame();
+	_apu->EndFrame();
+}
+
 void Console::ResetRunTimers()
 {
 	_resetRunTimers = true;
@@ -1023,6 +1057,9 @@ double Console::GetFrameDelay()
 void Console::SaveState(ostream &saveStream)
 {
 	if(_initialized) {
+		//Send any unprocessed sound to the SoundMixer - needed for rewind
+		_apu->EndFrame();
+
 		_cpu->SaveSnapshot(&saveStream);
 		_ppu->SaveSnapshot(&saveStream);
 		_memoryManager->SaveSnapshot(&saveStream);
@@ -1050,6 +1087,9 @@ void Console::LoadState(istream &loadStream)
 void Console::LoadState(istream &loadStream, uint32_t stateVersion)
 {
 	if(_initialized) {
+		//Send any unprocessed sound to the SoundMixer - needed for rewind
+		_apu->EndFrame();
+
 		_cpu->LoadSnapshot(&loadStream, stateVersion);
 		_ppu->LoadSnapshot(&loadStream, stateVersion);
 		_memoryManager->LoadSnapshot(&loadStream, stateVersion);
@@ -1080,9 +1120,6 @@ void Console::LoadState(istream &loadStream, uint32_t stateVersion)
 
 void Console::LoadState(uint8_t *buffer, uint32_t bufferSize)
 {
-	//Send any unprocessed sound to the SoundMixer - needed for rewind
-	_apu->EndFrame();
-
 	stringstream stream;
 	stream.write((char*)buffer, bufferSize);
 	stream.seekg(0, ios::beg);

Core/Console.h

@@ -100,6 +100,8 @@ private:
 	bool _initialized = false;
 	std::thread::id _emulationThreadId;
 
+	void RunFrameWithRunAhead(std::stringstream& runAheadState);
+
 	void LoadHdPack(VirtualFile &romFile, VirtualFile &patchFile);
 
 	void UpdateNesModel(bool sendNotification);
@@ -156,6 +158,7 @@ public:
 		
 	void RunSingleFrame();
 	void RunSlaveCpu();
+	void RunFrame();
 	bool UpdateHdPackMode();
 
 	shared_ptr<SystemActionManager> GetSystemActionManager();

Core/ControlManager.cpp

@@ -293,8 +293,10 @@ void ControlManager::UpdateInputState()
 		debugger->ProcessEvent(EventType::InputPolled);
 	}
 
-	for(IInputRecorder* recorder : _inputRecorders) {
-		recorder->RecordInput(_controlDevices);
+	if(!_console->GetSettings()->IsRunAheadFrame()) {
+		for(IInputRecorder* recorder : _inputRecorders) {
+			recorder->RecordInput(_controlDevices);
+		}
 	}
 
 	//Used by VS System games

Core/EmulationSettings.h

@@ -654,7 +654,10 @@ private:
 	double _volumeReduction = 0.75;
 	uint32_t _sampleRate = 48000;
 	AudioFilterSettings _audioFilterSettings;
-		
+
+	uint32_t _runAheadFrames = 0;
+	bool _isRunAheadFrame = false;
+
 	NesModel _model = NesModel::Auto;
 	PpuModel _ppuModel = PpuModel::Ppu2C02;
 
@@ -991,7 +994,27 @@ public:
 		}
 		return value;
 	}
-	
+
+	void SetRunAheadFrames(uint32_t frameCount)
+	{
+		_runAheadFrames = frameCount;
+	}
+
+	uint32_t GetRunAheadFrames()
+	{
+		return _runAheadFrames;
+	}
+
+	void SetRunAheadFrameFlag(bool disabled)
+	{
+		_isRunAheadFrame = disabled;
+	}
+
+	bool IsRunAheadFrame()
+	{
+		return _isRunAheadFrame;
+	}
+
 	//0: No limit, Number: % of default speed (50/60fps)
 	void SetEmulationSpeed(uint32_t emulationSpeed, bool displaySpeed = false)
 	{

Core/RewindManager.cpp

@@ -48,6 +48,10 @@ void RewindManager::ClearBuffer()
 
 void RewindManager::ProcessNotification(ConsoleNotificationType type, void * parameter)
 {
+	if(_settings->IsRunAheadFrame()) {
+		return;
+	}
+
 	if(type == ConsoleNotificationType::PpuFrameDone) {
 		_hasHistory = _history.size() >= 2;
 		if(_settings->GetRewindBufferSize() > 0) {

Core/SoundMixer.cpp

@@ -164,7 +164,7 @@ void SoundMixer::PlayAudioBuffer(uint32_t time)
 		_crossFeedFilter.ApplyFilter(_outputBuffer, sampleCount, filterSettings.CrossFadeRatio);
 	}
 
-	if(rewindManager && rewindManager->SendAudio(_outputBuffer, (uint32_t)sampleCount, _sampleRate)) {
+	if(!_settings->IsRunAheadFrame() && rewindManager && rewindManager->SendAudio(_outputBuffer, (uint32_t)sampleCount, _sampleRate)) {
 		bool isRecording = _waveRecorder || _console->GetVideoRenderer()->IsRecording();
 		if(isRecording) {
 			shared_ptr<WaveRecorder> recorder = _waveRecorder;

Core/SystemActionManager.h

@@ -41,11 +41,9 @@ public:
 	{
 		if(_needReset) {
 			SetBit(SystemActionManager::Buttons::ResetButton);
-			_needReset = false;
 		}
 		if(_needPowerCycle) {
 			SetBit(SystemActionManager::Buttons::PowerButton);
-			_needPowerCycle = false;
 		}		
 	}
 
@@ -72,6 +70,7 @@ public:
 		shared_ptr<Console> console = _console;
 		if(console) {
 			if(IsPressed(SystemActionManager::Buttons::ResetButton)) {
+				_needReset = false;
 				console->ResetComponents(true);
 				console->GetControlManager()->UpdateInputState();
 			}

Core/VideoDecoder.cpp

@@ -21,6 +21,7 @@
 VideoDecoder::VideoDecoder(shared_ptr<Console> console)
 {
 	_console = console;
+	_settings = _console->GetSettings();
 	_frameChanged = false;
 	_stopFlag = false;
 	UpdateVideoFilter();
@@ -158,6 +159,10 @@ uint32_t VideoDecoder::GetFrameCount()
 
 void VideoDecoder::UpdateFrameSync(void *ppuOutputBuffer, HdScreenInfo *hdScreenInfo)
 {
+	if(_settings->IsRunAheadFrame()) {
+		return;
+	}
+
 	_frameNumber = _console->GetFrameCount();
 	_hdScreenInfo = hdScreenInfo;
 	_ppuOutputBuffer = (uint16_t*)ppuOutputBuffer;
@@ -167,6 +172,10 @@ void VideoDecoder::UpdateFrameSync(void *ppuOutputBuffer, HdScreenInfo *hdScreen
 
 void VideoDecoder::UpdateFrame(void *ppuOutputBuffer, HdScreenInfo *hdScreenInfo)
 {
+	if(_settings->IsRunAheadFrame()) {
+		return;
+	}
+
 	if(_frameChanged) {
 		//Last frame isn't done decoding yet - sometimes Signal() introduces a 25-30ms delay
 		while(_frameChanged) {

Core/VideoDecoder.h

@@ -27,7 +27,7 @@ class VideoDecoder
 {
 private:
 	shared_ptr<Console> _console;
-
+	EmulationSettings* _settings;
 	uint16_t *_ppuOutputBuffer = nullptr;
 	HdScreenInfo *_hdScreenInfo = nullptr;
 	bool _hdFilterEnabled = false;

GUI.NET/Config/EmulationInfo.cs

@@ -38,6 +38,7 @@ namespace Mesen.GUI.Config
 		[MinMax(0, 5000)] public UInt32 EmulationSpeed = 100;
 		[MinMax(0, 5000)] public UInt32 TurboSpeed = 300;
 		[MinMax(0, 5000)] public UInt32 RewindSpeed = 100;
+		[MinMax(0, 10)] public UInt32 RunAheadFrames = 0;
 
 		public EmulationInfo()
 		{
@@ -49,6 +50,7 @@ namespace Mesen.GUI.Config
 
 			InteropEmu.SetEmulationSpeed(emulationInfo.EmulationSpeed);
 			InteropEmu.SetTurboRewindSpeed(emulationInfo.TurboSpeed, emulationInfo.RewindSpeed);
+			InteropEmu.SetRunAheadFrames(emulationInfo.RunAheadFrames);
 
 			InteropEmu.SetFlag(EmulationFlags.Mmc3IrqAltBehavior, emulationInfo.UseAlternativeMmc3Irq);
 			InteropEmu.SetFlag(EmulationFlags.AllowInvalidInput, emulationInfo.AllowInvalidInput);

GUI.NET/Dependencies/resources.ca.xml

@@ -308,6 +308,8 @@
 			<Control ID="lblEmulationSpeed">Velocitat d'emulació:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Velocitat màxima)</Control>
 			<Control ID="lblRewindSpeed">Velocitat del rebobinat:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Avançat</Control>
 			<Control ID="lblDeveloperSettings">Recommended settings for developers (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.en.xml

@@ -308,6 +308,8 @@
 			<Control ID="lblTurboSpeed">Fast Forward Speed:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Maximum speed)</Control>
 			<Control ID="lblRewindSpeed">Rewind Speed:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Advanced</Control>
 			<Control ID="lblDeveloperSettings">Recommended settings for developers (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.es.xml

@@ -307,6 +307,8 @@
 			<Control ID="lblEmulationSpeed">Velocidad de emulación:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Velocidad máxima)</Control>
 			<Control ID="lblRewindSpeed">Velocidad de rebobinado:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Avanzado</Control>
 			<Control ID="lblDeveloperSettings">Configuración recomendada para desarrolladores (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.fr.xml

@@ -308,6 +308,8 @@
 			<Control ID="lblTurboSpeed">Vitesse d'avance rapide :</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Vitesse maximale)</Control>
 			<Control ID="lblRewindSpeed">Vitesse du rembobinage :</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">images (réduit l'input lag, au coût de la performance)</Control>
 
 			<Control ID="tpgAdvanced">Avancé</Control>
 			<Control ID="lblDeveloperSettings">Options recommandées pour les développeurs (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.it.xml

@@ -308,6 +308,8 @@
 			<Control ID="lblTurboSpeed">Velocità avanti veloce:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Velocità massima)</Control>
 			<Control ID="lblRewindSpeed">Velocità Riavvolgimento:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Avanzato</Control>
 			<Control ID="lblDeveloperSettings">Opzioni raccomandate per sviluppatori (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.ja.xml

@@ -307,6 +307,8 @@
 			<Control ID="lblTurboSpeed">早送りの速度:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = 最高速度)</Control>
 			<Control ID="lblRewindSpeed">巻き戻しの速度:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">フレーム (入力遅延低下)</Control>
 
 			<Control ID="tpgAdvanced">詳細設定</Control>
 			<Control ID="lblDeveloperSettings">開発者向け設定 (自作ソフト / ROM hacking)</Control>

GUI.NET/Dependencies/resources.pt.xml

@@ -308,6 +308,8 @@
 			<Control ID="lblTurboSpeed">Velocidade de avanço rápido:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Velocidade máxima)</Control>
 			<Control ID="lblRewindSpeed">Velocidade de rebobinamento:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Avançado</Control>
 			<Control ID="lblDeveloperSettings">Configurações recomendadas para programadores (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.ru.xml

@@ -307,6 +307,8 @@
 			<Control ID="lblTurboSpeed">Перемотка:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Максимальная скорость)</Control>
 			<Control ID="lblRewindSpeed">Скорость перемотки:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Расширенные</Control>
 			<Control ID="lblDeveloperSettings">Рекомендованные настройки для разработчиков (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.uk.xml

@@ -307,6 +307,8 @@
 			<Control ID="lblTurboSpeed">Перемотка:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = Максимальна швидкiсть)</Control>
 			<Control ID="lblRewindSpeed">Швидкість перемотування:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">Розширені</Control>
 			<Control ID="lblDeveloperSettings">Recommended settings for developers (homebrew / ROM hacking)</Control>

GUI.NET/Dependencies/resources.zh.xml

@@ -334,6 +334,8 @@
 			<Control ID="lblTurboSpeed">快进速度:</Control>
 			<Control ID="lblRewindSpeedHint">%  (0 = 最快)</Control>
 			<Control ID="lblRewindSpeed">快退速度:</Control>
+			<Control ID="lblRunAhead">Run Ahead:</Control>
+			<Control ID="lblRunAheadFrames">frames (reduces input lag, increases CPU usage)</Control>
 
 			<Control ID="tpgAdvanced">高级</Control>
 			<Control ID="lblDeveloperSettings">开发者推荐设置 (自作/修改 ROM)</Control>

GUI.NET/Forms/Config/frmEmulationConfig.cs

@@ -27,6 +27,7 @@ namespace Mesen.GUI.Forms.Config
 			AddBinding("EmulationSpeed", nudEmulationSpeed);
 			AddBinding("TurboSpeed", nudTurboSpeed);
 			AddBinding("RewindSpeed", nudRewindSpeed);
+			AddBinding("RunAheadFrames", nudRunAheadFrames);
 
 			AddBinding("UseAlternativeMmc3Irq", chkUseAlternativeMmc3Irq);
 			AddBinding("AllowInvalidInput", chkAllowInvalidInput);

GUI.NET/InteropEmu.cs

@@ -31,6 +31,7 @@ namespace Mesen.GUI
 		[DllImport(DLLPath)] public static extern void HistoryViewerRelease();
 		[DllImport(DLLPath)] public static extern void HistoryViewerRun();
 		[DllImport(DLLPath)] public static extern void HistoryViewerStop();
+
 		[DllImport(DLLPath)] public static extern UInt32 HistoryViewerGetHistoryLength();
 		[DllImport(DLLPath)] [return: MarshalAs(UnmanagedType.I1)] public static extern bool HistoryViewerSaveMovie([MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(UTF8Marshaler))]string movieFile, UInt32 startPosition, UInt32 endPosition);
 		[DllImport(DLLPath)] [return: MarshalAs(UnmanagedType.I1)] public static extern bool HistoryViewerCreateSaveState([MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef = typeof(UTF8Marshaler))]string outfileFile, UInt32 position);
@@ -192,6 +193,7 @@ namespace Mesen.GUI
 		[DllImport(DLLPath)] public static extern void SetSampleRate(UInt32 sampleRate);
 		[DllImport(DLLPath)] public static extern void SetAudioLatency(UInt32 msLatency);
 		[DllImport(DLLPath)] public static extern void SetAudioFilterSettings(AudioFilterSettings settings);
+		[DllImport(DLLPath)] public static extern void SetRunAheadFrames(UInt32 frameCount);
 
 		[DllImport(DLLPath)] public static extern NesModel GetNesModel();
 		[DllImport(DLLPath)] public static extern void SetNesModel(NesModel model);

InteropDLL/ConsoleWrapper.cpp

@@ -627,6 +627,7 @@ namespace InteropEmu {
 		DllExport void __stdcall SetSampleRate(uint32_t sampleRate) { _settings->SetSampleRate(sampleRate); }
 		DllExport void __stdcall SetAudioLatency(uint32_t msLatency) { _settings->SetAudioLatency(msLatency); }
 		DllExport void __stdcall SetAudioFilterSettings(AudioFilterSettings settings) { _settings->SetAudioFilterSettings(settings); }
+		DllExport void __stdcall SetRunAheadFrames(uint32_t frameCount) { _settings->SetRunAheadFrames(frameCount); }
 
 		DllExport NesModel __stdcall GetNesModel() { return _console->GetModel(); }
 		DllExport void __stdcall SetNesModel(uint32_t model) { _settings->SetNesModel((NesModel)model); }