HostInterface: Add proper turbo speed setting

android/app/src/cpp/android_host_interface.cpp

@@ -538,6 +538,12 @@ void AndroidHostInterface::SetControllerAxisState(u32 index, s32 button_code, fl
     false);
 }
 
+void AndroidHostInterface::SetFastForwardEnabled(bool enabled)
+{
+  m_fast_forward_enabled = enabled;
+  UpdateSpeedLimiterState();
+}
+
 void AndroidHostInterface::RefreshGameList(bool invalidate_cache, bool invalidate_database,
                                            ProgressCallback* progress_callback)
 {
@@ -895,6 +901,20 @@ DEFINE_JNI_ARGS_METHOD(jboolean, AndroidHostInterface_hasAnyBIOSImages, jobject
   return hi->HasAnyBIOSImages();
 }
 
+DEFINE_JNI_ARGS_METHOD(jboolean, AndroidHostInterface_isFastForwardEnabled, jobject obj)
+{
+  return AndroidHelpers::GetNativeClass(env, obj)->IsFastForwardEnabled();
+}
+
+DEFINE_JNI_ARGS_METHOD(void, AndroidHostInterface_setFastForwardEnabled, jobject obj, jboolean enabled)
+{
+  if (!System::IsValid())
+    return;
+
+  AndroidHostInterface* hi = AndroidHelpers::GetNativeClass(env, obj);
+  hi->RunOnEmulationThread([enabled, hi]() { hi->SetFastForwardEnabled(enabled); });
+}
+
 DEFINE_JNI_ARGS_METHOD(jstring, AndroidHostInterface_importBIOSImage, jobject obj, jbyteArray data)
 {
   AndroidHostInterface* hi = AndroidHelpers::GetNativeClass(env, obj);

android/app/src/cpp/android_host_interface.h

@@ -49,6 +49,7 @@ public:
   void SetControllerType(u32 index, std::string_view type_name);
   void SetControllerButtonState(u32 index, s32 button_code, bool pressed);
   void SetControllerAxisState(u32 index, s32 button_code, float value);
+  void SetFastForwardEnabled(bool enabled);
 
   void RefreshGameList(bool invalidate_cache, bool invalidate_database, ProgressCallback* progress_callback);
   void ApplySettings(bool display_osd_messages);

android/app/src/main/java/com/github/stenzek/duckstation/AndroidHostInterface.java

@@ -79,6 +79,9 @@ public class AndroidHostInterface {
 
     public native String importBIOSImage(byte[] data);
 
+    public native boolean isFastForwardEnabled();
+    public native void setFastForwardEnabled(boolean enabled);
+
     static {
         System.loadLibrary("duckstation-native");
     }

android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java

@@ -284,11 +284,9 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
                     return;
                 }
 
-                case 3:     // Toggle Speed Limiter
+                case 3:     // Toggle Fast Forward
                 {
-                    boolean newSetting = !getBooleanSetting("Main/SpeedLimiterEnabled", true);
+                    AndroidHostInterface.getInstance().setFastForwardEnabled(!AndroidHostInterface.getInstance().isFastForwardEnabled());
-                    setBooleanSetting("Main/SpeedLimiterEnabled", newSetting);
-                    applySettings();
                     return;
                 }
 

android/app/src/main/res/values/arrays.xml

@@ -131,7 +131,7 @@
         <item>Load State</item>
         <item>Save State</item>
         <item>Save State Slot</item>
-        <item>Toggle Speed Limiter</item>
+        <item>Toggle Fast Forward</item>
         <item>More Options</item>
         <item>Quit</item>
     </string-array>
@@ -283,4 +283,60 @@
         <item>75</item>
         <item>90</item>
     </string-array>
+    <string-array name="settings_emulation_speed_entries">
+        <item>Unlimited</item>
+        <item>10% [6 FPS (NTSC) / 5 FPS (PAL)]</item>
+        <item>20% [12 FPS (NTSC) / 10 FPS (PAL)]</item>
+        <item>30% [18 FPS (NTSC) / 15 FPS (PAL)]</item>
+        <item>40% [24 FPS (NTSC) / 20 FPS (PAL)]</item>
+        <item>50% [30 FPS (NTSC) / 25 FPS (PAL)]</item>
+        <item>60% [36 FPS (NTSC) / 30 FPS (PAL)]</item>
+        <item>70% [42 FPS (NTSC) / 35 FPS (PAL)]</item>
+        <item>80% [48 FPS (NTSC) / 40 FPS (PAL)]</item>
+        <item>90% [54 FPS (NTSC) / 45 FPS (PAL)]</item>
+        <item>100% [60 FPS (NTSC) / 50 FPS (PAL), Default]</item>
+        <item>125% [75 FPS (NTSC) / 62 FPS (PAL)]</item>
+        <item>150% [90 FPS (NTSC) / 75 FPS (PAL)]</item>
+        <item>175% [105 FPS (NTSC) / 87 FPS (PAL)]</item>
+        <item>200% [120 FPS (NTSC) / 100 FPS (PAL)]</item>
+        <item>250% [150 FPS (NTSC) / 125 FPS (PAL)]</item>
+        <item>300% [180 FPS (NTSC) / 150 FPS (PAL)]</item>
+        <item>350% [210 FPS (NTSC) / 175 FPS (PAL)]</item>
+        <item>400% [240 FPS (NTSC) / 200 FPS (PAL)]</item>
+        <item>450% [270 FPS (NTSC) / 225 FPS (PAL)]</item>
+        <item>500% [300 FPS (NTSC) / 250 FPS (PAL)]</item>
+        <item>600% [360 FPS (NTSC) / 300 FPS (PAL)]</item>
+        <item>700% [420 FPS (NTSC) / 350 FPS (PAL)]</item>
+        <item>800% [480 FPS (NTSC) / 400 FPS (PAL)]</item>
+        <item>900% [540 FPS (NTSC) / 450 FPS (PAL)]</item>
+        <item>1000% [600 FPS (NTSC) / 500 FPS (PAL)]</item>
+    </string-array>
+    <string-array name="settings_emulation_speed_values">
+      <item>0.0</item>
+      <item>0.1</item>
+      <item>0.2</item>
+      <item>0.3</item>
+      <item>0.4</item>
+      <item>0.5</item>
+      <item>0.6</item>
+      <item>0.7</item>
+      <item>0.8</item>
+      <item>0.9</item>
+      <item>1.0</item>
+      <item>1.25</item>
+      <item>1.5</item>
+      <item>1.75</item>
+      <item>2.0</item>
+      <item>2.5</item>
+      <item>3.0</item>
+      <item>3.5</item>
+      <item>4.0</item>
+      <item>4.5</item>
+      <item>5.0</item>
+      <item>6.0</item>
+      <item>7.0</item>
+      <item>8.0</item>
+      <item>9.0</item>
+      <item>10.0</item>
+  </string-array>
 </resources>

android/app/src/main/res/xml/general_preferences.xml

@@ -17,6 +17,22 @@
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
+        <ListPreference
+            app:key="Main/EmulationSpeed"
+            app:title="Emulation Speed"
+            app:entries="@array/settings_emulation_speed_entries"
+            app:entryValues="@array/settings_emulation_speed_values"
+            app:defaultValue="1.0"
+            app:useSimpleSummaryProvider="true"
+            app:iconSpaceReserved="false" />
+        <ListPreference
+            app:key="Main/FastForwardSpeed"
+            app:title="Fast Forward Speed"
+            app:entries="@array/settings_emulation_speed_entries"
+            app:entryValues="@array/settings_emulation_speed_values"
+            app:defaultValue="0.0"
+            app:useSimpleSummaryProvider="true"
+            app:iconSpaceReserved="false" />
         <SwitchPreferenceCompat
             app:key="Main/SpeedLimiterEnabled"
             app:title="@string/settings_behavior_enable_speed_limiter"

src/core/host_interface.cpp

@@ -414,7 +414,7 @@ void HostInterface::SetDefaultSettings(SettingsInterface& si)
   si.SetStringValue("Console", "Region", Settings::GetConsoleRegionName(Settings::DEFAULT_CONSOLE_REGION));
 
   si.SetFloatValue("Main", "EmulationSpeed", 1.0f);
-  si.SetBoolValue("Main", "SpeedLimiterEnabled", true);
+  si.SetFloatValue("Main", "FastForwardSpeed", 0.0f);
   si.SetBoolValue("Main", "IncreaseTimerResolution", true);
   si.SetBoolValue("Main", "StartPaused", false);
   si.SetBoolValue("Main", "SaveStateOnExit", true);

src/core/settings.cpp

@@ -110,7 +110,7 @@ void Settings::Load(SettingsInterface& si)
     ParseConsoleRegionName(si.GetStringValue("Console", "Region", "NTSC-U").c_str()).value_or(DEFAULT_CONSOLE_REGION);
 
   emulation_speed = si.GetFloatValue("Main", "EmulationSpeed", 1.0f);
-  speed_limiter_enabled = si.GetBoolValue("Main", "SpeedLimiterEnabled", true);
+  fast_forward_speed = si.GetFloatValue("Main", "FastForwardSpeed", 0.0f);
   increase_timer_resolution = si.GetBoolValue("Main", "IncreaseTimerResolution", true);
   start_paused = si.GetBoolValue("Main", "StartPaused", false);
   start_fullscreen = si.GetBoolValue("Main", "StartFullscreen", false);
@@ -249,7 +249,7 @@ void Settings::Save(SettingsInterface& si) const
   si.SetStringValue("Console", "Region", GetConsoleRegionName(region));
 
   si.SetFloatValue("Main", "EmulationSpeed", emulation_speed);
-  si.SetBoolValue("Main", "SpeedLimiterEnabled", speed_limiter_enabled);
+  si.SetFloatValue("Main", "FastForwardSpeed", fast_forward_speed);
   si.SetBoolValue("Main", "IncreaseTimerResolution", increase_timer_resolution);
   si.SetBoolValue("Main", "StartPaused", start_paused);
   si.SetBoolValue("Main", "StartFullscreen", start_fullscreen);

src/core/settings.h

@@ -79,7 +79,7 @@ struct Settings
   bool cpu_fastmem = true;
 
   float emulation_speed = 1.0f;
-  bool speed_limiter_enabled = true;
+  float fast_forward_speed = 0.0f;
   bool increase_timer_resolution = true;
   bool start_paused = false;
   bool start_fullscreen = false;

src/core/system.cpp

@@ -78,6 +78,7 @@ static std::string s_running_game_code;
 static std::string s_running_game_title;
 
 static float s_throttle_frequency = 60.0f;
+static float s_target_speed = 1.0f;
 static s32 s_throttle_period = 0;
 static u64 s_last_throttle_time = 0;
 static Common::Timer s_throttle_timer;
@@ -1170,6 +1171,12 @@ void RunFrame()
   g_gpu->ResetGraphicsAPIState();
 }
 
+void SetTargetSpeed(float speed)
+{
+  s_target_speed = speed;
+  UpdateThrottlePeriod();
+}
+
 void SetThrottleFrequency(float frequency)
 {
   s_throttle_frequency = frequency;
@@ -1178,8 +1185,8 @@ void SetThrottleFrequency(float frequency)
 
 void UpdateThrottlePeriod()
 {
-  s_throttle_period = static_cast<s32>(1000000000.0 / static_cast<double>(s_throttle_frequency) /
+  s_throttle_period =
-                                       static_cast<double>(g_settings.emulation_speed));
+    static_cast<s32>(1000000000.0 / static_cast<double>(s_throttle_frequency) / static_cast<double>(s_target_speed));
 }
 
 void Throttle()

src/core/system.h

@@ -146,6 +146,9 @@ bool RecreateGPU(GPURenderer renderer);
 
 void RunFrame();
 
+/// Sets target emulation speed.
+void SetTargetSpeed(float speed);
+
 /// Adjusts the throttle frequency, i.e. how many times we should sleep per second.
 void SetThrottleFrequency(float frequency);
 

src/duckstation-qt/advancedsettingswidget.cpp

@@ -107,6 +107,8 @@ AdvancedSettingsWidget::AdvancedSettingsWidget(QtHostInterface* host_interface,
                         "UseDebugDevice", false);
   addIntRangeTweakOption(m_host_interface, m_ui.tweakOptionTable, tr("Display FPS Limit"), "Display", "MaxFPS", 0, 1000,
                          0);
+  addBooleanTweakOption(m_host_interface, m_ui.tweakOptionTable, tr("Increase Timer Resolution"), "Main",
+                        "IncreaseTimerResolution", true);
 }
 
 AdvancedSettingsWidget::~AdvancedSettingsWidget() = default;
@@ -125,4 +127,5 @@ void AdvancedSettingsWidget::onResetToDefaultClicked()
   setIntRangeTweakOption(m_ui.tweakOptionTable, 9, static_cast<int>(Settings::DEFAULT_GPU_MAX_RUN_AHEAD));
   setBooleanTweakOption(m_ui.tweakOptionTable, 10, false);
   setIntRangeTweakOption(m_ui.tweakOptionTable, 11, 0);
+  setBooleanTweakOption(m_ui.tweakOptionTable, 12, true);
 }

src/duckstation-qt/generalsettingswidget.cpp

@@ -1,6 +1,7 @@
 #include "generalsettingswidget.h"
 #include "autoupdaterdialog.h"
 #include "frontend-common/controller_interface.h"
+#include "qtutils.h"
 #include "settingsdialog.h"
 #include "settingwidgetbinder.h"
 
@@ -27,22 +28,25 @@ GeneralSettingsWidget::GeneralSettingsWidget(QtHostInterface* host_interface, QW
                                                true);
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.autoLoadCheats, "Main", "AutoLoadCheats", false);
 
-  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.enableSpeedLimiter, "Main", "SpeedLimiterEnabled",
-                                               true);
-  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.increaseTimerResolution, "Main",
-                                               "IncreaseTimerResolution", true);
-  SettingWidgetBinder::BindWidgetToNormalizedSetting(m_host_interface, m_ui.emulationSpeed, "Main", "EmulationSpeed",
-                                                     100.0f, 1.0f);
   SettingWidgetBinder::BindWidgetToEnumSetting(
     m_host_interface, m_ui.controllerBackend, "Main", "ControllerBackend", &ControllerInterface::ParseBackendName,
     &ControllerInterface::GetBackendName, ControllerInterface::GetDefaultBackend());
 
-  connect(m_ui.enableSpeedLimiter, &QCheckBox::stateChanged, this,
+  QtUtils::FillComboBoxWithEmulationSpeeds(m_ui.emulationSpeed);
-          &GeneralSettingsWidget::onEnableSpeedLimiterStateChanged);
+  const int emulation_speed_index =
-  connect(m_ui.emulationSpeed, &QSlider::valueChanged, this, &GeneralSettingsWidget::onEmulationSpeedValueChanged);
+    m_ui.emulationSpeed->findData(QVariant(m_host_interface->GetFloatSettingValue("Main", "EmulationSpeed")));
+  if (emulation_speed_index >= 0)
+    m_ui.emulationSpeed->setCurrentIndex(emulation_speed_index);
+  connect(m_ui.emulationSpeed, QOverload<int>::of(&QComboBox::currentIndexChanged), this,
+          &GeneralSettingsWidget::onEmulationSpeedIndexChanged);
 
-  onEnableSpeedLimiterStateChanged();
+  QtUtils::FillComboBoxWithEmulationSpeeds(m_ui.fastForwardSpeed);
-  onEmulationSpeedValueChanged(m_ui.emulationSpeed->value());
+  const int fast_forward_speed_index =
+    m_ui.emulationSpeed->findData(QVariant(m_host_interface->GetFloatSettingValue("Main", "FastForwardSpeed")));
+  if (fast_forward_speed_index >= 0)
+    m_ui.fastForwardSpeed->setCurrentIndex(fast_forward_speed_index);
+  connect(m_ui.fastForwardSpeed, QOverload<int>::of(&QComboBox::currentIndexChanged), this,
+          &GeneralSettingsWidget::onFastForwardSpeedIndexChanged);
 
   dialog->registerWidgetHelp(
     m_ui.confirmPowerOff, tr("Confirm Power Off"), tr("Checked"),
@@ -68,18 +72,14 @@ GeneralSettingsWidget::GeneralSettingsWidget(QtHostInterface* host_interface, QW
     m_ui.applyGameSettings, tr("Apply Per-Game Settings"), tr("Checked"),
     tr("When enabled, per-game settings will be applied, and incompatible enhancements will be disabled. You should "
        "leave this option enabled except when testing enhancements with incompatible games."));
-  dialog->registerWidgetHelp(
-    m_ui.enableSpeedLimiter, tr("Enable Speed Limiter"), tr("Checked"),
-    tr("Throttles the emulation speed to the chosen speed above. If unchecked, the emulator will "
-       "run as fast as possible, which may not be playable."));
-  dialog->registerWidgetHelp(
-    m_ui.increaseTimerResolution, tr("Increase Timer Resolution"), tr("Checked"),
-    tr("Increases the system timer resolution when emulation is started to provide more accurate "
-       "frame pacing. May increase battery usage on laptops."));
   dialog->registerWidgetHelp(
     m_ui.emulationSpeed, tr("Emulation Speed"), "100%",
     tr("Sets the target emulation speed. It is not guaranteed that this speed will be reached, "
        "and if not, the emulator will run as fast as it can manage."));
+  dialog->registerWidgetHelp(
+    m_ui.fastForwardSpeed, tr("Fast Forward Speed"), "100%",
+    tr(
+      "Sets the fast forward (turbo) speed. This speed will be used when the fast forward hotkey is pressed/toggled."));
   dialog->registerWidgetHelp(m_ui.controllerBackend, tr("Controller Backend"),
                              qApp->translate("ControllerInterface", ControllerInterface::GetBackendName(
                                                                       ControllerInterface::GetDefaultBackend())),
@@ -119,12 +119,18 @@ GeneralSettingsWidget::GeneralSettingsWidget(QtHostInterface* host_interface, QW
 
 GeneralSettingsWidget::~GeneralSettingsWidget() = default;
 
-void GeneralSettingsWidget::onEnableSpeedLimiterStateChanged()
+void GeneralSettingsWidget::onEmulationSpeedIndexChanged(int index)
 {
-  m_ui.emulationSpeed->setDisabled(!m_ui.enableSpeedLimiter->isChecked());
+  bool okay;
+  const float value = m_ui.emulationSpeed->currentData().toFloat(&okay);
+  m_host_interface->SetFloatSettingValue("Main", "EmulationSpeed", okay ? value : 1.0f);
+  m_host_interface->applySettings();
 }
 
-void GeneralSettingsWidget::onEmulationSpeedValueChanged(int value)
+void GeneralSettingsWidget::onFastForwardSpeedIndexChanged(int index)
 {
-  m_ui.emulationSpeedLabel->setText(tr("%1%").arg(value));
+  bool okay;
+  const float value = m_ui.fastForwardSpeed->currentData().toFloat(&okay);
+  m_host_interface->SetFloatSettingValue("Main", "FastForwardSpeed", okay ? value : 0.0f);
+  m_host_interface->applySettings();
 }

src/duckstation-qt/generalsettingswidget.h

@@ -16,8 +16,8 @@ public:
   ~GeneralSettingsWidget();
 
 private Q_SLOTS:
-  void onEnableSpeedLimiterStateChanged();
+  void onEmulationSpeedIndexChanged(int index);
-  void onEmulationSpeedValueChanged(int value);
+  void onFastForwardSpeedIndexChanged(int index);
 
 private:
   Ui::GeneralSettingsWidget m_ui;

src/duckstation-qt/generalsettingswidget.ui

@@ -94,61 +94,28 @@
    <item>
     <widget class="QGroupBox" name="groupBox_3">
      <property name="title">
-      <string>Emulation Speed</string>
+      <string>Speed Control</string>
      </property>
-     <layout class="QGridLayout" name="formLayout_3">
+     <layout class="QGridLayout" name="formLayout">
-      <item row="0" column="0" colspan="2">
+      <item row="0" column="0">
-       <layout class="QHBoxLayout" name="horizontalLayout_2">
+       <widget class="QLabel" name="label_2">
-        <item>
-         <widget class="QSlider" name="emulationSpeed">
-          <property name="minimum">
-           <number>25</number>
-          </property>
-          <property name="maximum">
-           <number>500</number>
-          </property>
-          <property name="singleStep">
-           <number>25</number>
-          </property>
-          <property name="pageStep">
-           <number>25</number>
-          </property>
-          <property name="value">
-           <number>100</number>
-          </property>
-          <property name="orientation">
-           <enum>Qt::Horizontal</enum>
-          </property>
-          <property name="tickPosition">
-           <enum>QSlider::TicksBelow</enum>
-          </property>
-          <property name="tickInterval">
-           <number>25</number>
-          </property>
-         </widget>
-        </item>
-        <item>
-         <widget class="QLabel" name="emulationSpeedLabel">
         <property name="text">
-           <string>100%</string>
+         <string>Emulation Speed:</string>
         </property>
        </widget>
       </item>
-       </layout>
+      <item row="0" column="1">
+       <widget class="QComboBox" name="emulationSpeed"/>
       </item>
       <item row="1" column="0">
-       <widget class="QCheckBox" name="enableSpeedLimiter">
+       <widget class="QLabel" name="label_3">
         <property name="text">
-         <string>Enable Speed Limiter</string>
+         <string>Fast Forward Speed:</string>
         </property>
        </widget>
       </item>
       <item row="1" column="1">
-       <widget class="QCheckBox" name="increaseTimerResolution">
+       <widget class="QComboBox" name="fastForwardSpeed"/>
-        <property name="text">
-         <string>Increase Timer Resolution</string>
-        </property>
-       </widget>
       </item>
      </layout>
     </widget>
@@ -192,7 +159,7 @@
   </layout>
  </widget>
  <resources>
-  <include location="resources/icons.qrc"/>
+  <include location="resources/resources.qrc"/>
  </resources>
  <connections/>
 </ui>

src/duckstation-qt/qtutils.cpp

@@ -1,5 +1,6 @@
 #include "qtutils.h"
 #include "common/byte_stream.h"
+#include "common/make_array.h"
 #include <QtCore/QCoreApplication>
 #include <QtCore/QMetaObject>
 #include <QtGui/QDesktopServices>
@@ -719,4 +720,20 @@ void FillComboBoxWithMSAAModes(QComboBox* cb)
     cb->addItem(qApp->translate("GPUSettingsWidget", "%1x SSAA").arg(i), GetMSAAModeValue(i, true));
 }
 
+void FillComboBoxWithEmulationSpeeds(QComboBox* cb)
+{
+  cb->addItem(qApp->translate("GeneralSettingsWidget", "Unlimited"), QVariant(0.0f));
+
+  static constexpr auto speeds = make_array(10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 250, 300, 350,
+                                            400, 450, 500, 600, 700, 800, 900, 1000);
+  for (const int speed : speeds)
+  {
+    cb->addItem(qApp->translate("GeneralSettingsWidget", "%1% [%2 FPS (NTSC) / %3 FPS (PAL)]")
+                  .arg(speed)
+                  .arg((60 * speed) / 100)
+                  .arg((50 * speed) / 100),
+                QVariant(static_cast<float>(speed) / 100.0f));
+  }
+}
+
 } // namespace QtUtils

src/duckstation-qt/qtutils.h

@@ -68,4 +68,7 @@ QVariant GetMSAAModeValue(uint multisamples, bool ssaa);
 void DecodeMSAAModeValue(const QVariant& userdata, uint* multisamples, bool* ssaa);
 void FillComboBoxWithMSAAModes(QComboBox* cb);
 
+/// Fills a combo box with emulation speed options.
+void FillComboBoxWithEmulationSpeeds(QComboBox* cb);
+
 } // namespace QtUtils

src/duckstation-sdl/sdl_host_interface.cpp

@@ -843,9 +843,6 @@ void SDLHostInterface::DrawMainMenuBar()
 void SDLHostInterface::DrawQuickSettingsMenu()
 {
   bool settings_changed = false;
-  settings_changed |= ImGui::MenuItem("Enable Speed Limiter", nullptr, &m_settings_copy.speed_limiter_enabled);
-
-  ImGui::Separator();
 
   if (ImGui::BeginMenu("CPU Execution Mode"))
   {
@@ -1288,7 +1285,6 @@ void SDLHostInterface::DrawSettingsWindow()
         ImGui::SameLine(indent);
 
         settings_changed |= ImGui::SliderFloat("##speed", &m_settings_copy.emulation_speed, 0.25f, 5.0f);
-        settings_changed |= ImGui::Checkbox("Enable Speed Limiter", &m_settings_copy.speed_limiter_enabled);
         settings_changed |= ImGui::Checkbox("Increase Timer Resolution", &m_settings_copy.increase_timer_resolution);
         settings_changed |= ImGui::Checkbox("Pause On Start", &m_settings_copy.start_paused);
         settings_changed |= ImGui::Checkbox("Start Fullscreen", &m_settings_copy.start_fullscreen);

src/frontend-common/common_host_interface.cpp

@@ -598,9 +598,10 @@ bool CommonHostInterface::ResumeSystemFromMostRecentState()
 
 void CommonHostInterface::UpdateSpeedLimiterState()
 {
-  m_speed_limiter_enabled = g_settings.speed_limiter_enabled && !m_speed_limiter_temp_disabled;
+  const float target_speed = m_fast_forward_enabled ? g_settings.fast_forward_speed : g_settings.emulation_speed;
+  m_speed_limiter_enabled = (target_speed != 0.0f);
 
-  const bool is_non_standard_speed = (std::abs(g_settings.emulation_speed - 1.0f) > 0.05f);
+  const bool is_non_standard_speed = (std::abs(target_speed - 1.0f) > 0.05f);
   const bool audio_sync_enabled =
     !System::IsRunning() || (m_speed_limiter_enabled && g_settings.audio_sync_enabled && !is_non_standard_speed);
   const bool video_sync_enabled =
@@ -627,7 +628,10 @@ void CommonHostInterface::UpdateSpeedLimiterState()
     SetTimerResolutionIncreased(m_speed_limiter_enabled);
 
   if (System::IsValid())
+  {
+    System::SetTargetSpeed(m_speed_limiter_enabled ? target_speed : 1.0f);
     System::ResetPerformanceCounters();
+  }
 }
 
 void CommonHostInterface::RecreateSystem()
@@ -1367,7 +1371,7 @@ void CommonHostInterface::RegisterGeneralHotkeys()
 {
   RegisterHotkey(StaticString(TRANSLATABLE("Hotkeys", "General")), StaticString("FastForward"),
                  TRANSLATABLE("Hotkeys", "Fast Forward"), [this](bool pressed) {
-                   m_speed_limiter_temp_disabled = pressed;
+                   m_fast_forward_enabled = pressed;
                    UpdateSpeedLimiterState();
                  });
 
@@ -1375,11 +1379,11 @@ void CommonHostInterface::RegisterGeneralHotkeys()
                  StaticString(TRANSLATABLE("Hotkeys", "Toggle Fast Forward")), [this](bool pressed) {
                    if (pressed)
                    {
-                     m_speed_limiter_temp_disabled = !m_speed_limiter_temp_disabled;
+                     m_fast_forward_enabled = !m_fast_forward_enabled;
                      UpdateSpeedLimiterState();
-                     AddOSDMessage(m_speed_limiter_enabled ?
+                     AddOSDMessage(m_fast_forward_enabled ?
-                                     TranslateStdString("OSDMessage", "Speed limiter enabled.") :
+                                     TranslateStdString("OSDMessage", "Fast forwarding...") :
-                                     TranslateStdString("OSDMessage", "Speed limiter disabled."),
+                                     TranslateStdString("OSDMessage", "Stopped fast forwarding."),
                                    2.0f);
                    }
                  });
@@ -2080,9 +2084,9 @@ void CommonHostInterface::CheckForSettingsChanges(const Settings& old_settings)
         g_settings.audio_buffer_size != old_settings.audio_buffer_size ||
         g_settings.video_sync_enabled != old_settings.video_sync_enabled ||
         g_settings.audio_sync_enabled != old_settings.audio_sync_enabled ||
-        g_settings.speed_limiter_enabled != old_settings.speed_limiter_enabled ||
         g_settings.increase_timer_resolution != old_settings.increase_timer_resolution ||
         g_settings.emulation_speed != old_settings.emulation_speed ||
+        g_settings.fast_forward_speed != old_settings.fast_forward_speed ||
         g_settings.display_max_fps != old_settings.display_max_fps)
     {
       UpdateSpeedLimiterState();

src/frontend-common/common_host_interface.h

@@ -180,6 +180,9 @@ public:
   /// Parses a fullscreen mode into its components (width * height @ refresh hz)
   static bool ParseFullscreenMode(const std::string_view& mode, u32* width, u32* height, float* refresh_rate);
 
+  /// Returns true if fast forwarding is currently active.
+  bool IsFastForwardEnabled() const { return m_fast_forward_enabled; }
+
 protected:
   enum : u32
   {
@@ -325,9 +328,9 @@ protected:
   std::mutex m_osd_messages_lock;
 
   bool m_frame_step_request = false;
-  bool m_speed_limiter_temp_disabled = false;
+  bool m_fast_forward_enabled = false;
-  bool m_speed_limiter_enabled = false;
   bool m_timer_resolution_increased = false;
+  bool m_speed_limiter_enabled = true;
 
 private:
   void InitializeUserDirectory();