implement 3 configurable and toggleable framerate targets (#2159)

This pr allows for configuring the framerate target and adds support for two other framerate targets, a "fastforward" and "slowmo" target which can be enabled via either a toggle or holding a button.
this allows for supporting a more accurate framerate target and allows for users to slow down the speed of gameplay if they so desire

src/frontend/qt_sdl/Config.cpp

@@ -55,7 +55,6 @@ DefaultList<int> DefaultInts =
     {"Screen.VSyncInterval", 1},
     {"3D.Renderer", renderer3D_Software},
     {"3D.GL.ScaleFactor", 1},
-    {"MaxFPS", 1000},
 #ifdef JIT_ENABLED
     {"JIT.MaxBlockSize", 32},
 #endif
@@ -120,6 +119,13 @@ DefaultList<std::string> DefaultStrings =
     {"Instance*.Firmware.Username",     "melonDS"}
 };
 
+DefaultList<double> DefaultDoubles =
+{
+    {"TargetFPS", 60.0},
+    {"FastForwardFPS", 1000.0},
+    {"SlowmoFPS", 30.0},
+};
+
 LegacyEntry LegacyFile[] =
 {
     {"Key_A",      0, "Keyboard.A", true},
@@ -153,7 +159,7 @@ LegacyEntry LegacyFile[] =
     {"HKKey_Pause",               0, "Keyboard.HK_Pause", true},
     {"HKKey_Reset",               0, "Keyboard.HK_Reset", true},
     {"HKKey_FastForward",         0, "Keyboard.HK_FastForward", true},
-    {"HKKey_FastForwardToggle",   0, "Keyboard.HK_FastForwardToggle", true},
+    {"HKKey_FastForwardToggle",   0, "Keyboard.HK_FrameLimitToggle", true},
     {"HKKey_FullscreenToggle",    0, "Keyboard.HK_FullscreenToggle", true},
     {"HKKey_SwapScreens",         0, "Keyboard.HK_SwapScreens", true},
     {"HKKey_SwapScreenEmphasis",  0, "Keyboard.HK_SwapScreenEmphasis", true},
@@ -169,7 +175,7 @@ LegacyEntry LegacyFile[] =
     {"HKJoy_Pause",               0, "Joystick.HK_Pause", true},
     {"HKJoy_Reset",               0, "Joystick.HK_Reset", true},
     {"HKJoy_FastForward",         0, "Joystick.HK_FastForward", true},
-    {"HKJoy_FastForwardToggle",   0, "Joystick.HK_FastForwardToggle", true},
+    {"HKJoy_FastForwardToggle",   0, "Joystick.HK_FrameLimitToggle", true},
     {"HKJoy_FullscreenToggle",    0, "Joystick.HK_FullscreenToggle", true},
     {"HKJoy_SwapScreens",         0, "Joystick.HK_SwapScreens", true},
     {"HKJoy_SwapScreenEmphasis",  0, "Joystick.HK_SwapScreenEmphasis", true},
@@ -434,6 +440,18 @@ std::string Array::GetString(const int id)
     return tval.as_string();
 }
 
+double Array::GetDouble(const int id)
+{
+    while (Data.size() < id+1)
+        Data.push_back(0.0);
+
+    toml::value& tval = Data[id];
+    if (!tval.is_floating())
+        tval = 0.0;
+
+    return tval.as_floating();
+}
+
 void Array::SetInt(const int id, int val)
 {
     while (Data.size() < id+1)
@@ -470,6 +488,15 @@ void Array::SetString(const int id, const std::string& val)
     tval = val;
 }
 
+void Array::SetDouble(const int id, double val)
+{
+    while (Data.size() < id+1)
+        Data.push_back(0.0);
+
+    toml::value& tval = Data[id];
+    tval = val;
+}
+
 
 /*Table::Table()// : Data(toml::value())
 {
@@ -562,6 +589,15 @@ std::string Table::GetString(const std::string& path)
     return tval.as_string();
 }
 
+double Table::GetDouble(const std::string& path)
+{
+    toml::value& tval = ResolvePath(path);
+    if (!tval.is_floating())
+        tval = FindDefault(path, 0.0, DefaultDoubles);
+
+    return tval.as_floating();
+}
+
 void Table::SetInt(const std::string& path, int val)
 {
     std::string rngkey = GetDefaultKey(PathPrefix+path);
@@ -593,6 +629,12 @@ void Table::SetString(const std::string& path, const std::string& val)
     tval = val;
 }
 
+void Table::SetDouble(const std::string& path, double val)
+{
+    toml::value& tval = ResolvePath(path);
+    tval = val;
+}
+
 toml::value& Table::ResolvePath(const std::string& path)
 {
     toml::value* ret = &Data;

src/frontend/qt_sdl/Config.h

@@ -61,11 +61,13 @@ public:
     int64_t GetInt64(const int id);
     bool GetBool(const int id);
     std::string GetString(const int id);
+    double GetDouble(const int id);
 
     void SetInt(const int id, int val);
     void SetInt64(const int id, int64_t val);
     void SetBool(const int id, bool val);
     void SetString(const int id, const std::string& val);
+    void SetDouble(const int id, double val);
 
     // convenience
 
@@ -99,11 +101,13 @@ public:
     int64_t GetInt64(const std::string& path);
     bool GetBool(const std::string& path);
     std::string GetString(const std::string& path);
+    double GetDouble(const std::string& path);
 
     void SetInt(const std::string& path, int val);
     void SetInt64(const std::string& path, int64_t val);
     void SetBool(const std::string& path, bool val);
     void SetString(const std::string& path, const std::string& val);
+    void SetDouble(const std::string& path, double val);
 
     // convenience
 

src/frontend/qt_sdl/EmuInstance.cpp

@@ -88,7 +88,31 @@ EmuInstance::EmuInstance(int inst) : deleting(false),
     cheatsOn = localCfg.GetBool("EnableCheats");
 
     doLimitFPS = globalCfg.GetBool("LimitFPS");
-    maxFPS = globalCfg.GetInt("MaxFPS");
+
+    double val = globalCfg.GetDouble("TargetFPS");
+    if (val == 0.0)
+    {
+        Platform::Log(Platform::LogLevel::Error, "Target FPS in config invalid\n");
+        targetFPS = 1.0 / 60.0;
+    }
+    else targetFPS = 1.0 / val;
+
+    val = globalCfg.GetDouble("FastForwardFPS");
+    if (val == 0.0)
+    {
+        Platform::Log(Platform::LogLevel::Error, "Fast-Forward FPS in config invalid\n");
+        fastForwardFPS = 1.0 / 60.0;
+    }
+    else fastForwardFPS = 1.0 / val;
+
+    val = globalCfg.GetDouble("SlowmoFPS");
+    if (val == 0.0)
+    {
+        Platform::Log(Platform::LogLevel::Error, "Slow-Mo FPS in config invalid\n");
+        slowmoFPS = 1.0 / 60.0;
+    }
+    else slowmoFPS = 1.0 / val;
+
     doAudioSync = globalCfg.GetBool("AudioSync");
 
     mpAudioMode = globalCfg.GetInt("MP.AudioMode");

src/frontend/qt_sdl/EmuInstance.h

@@ -36,7 +36,7 @@ enum
     HK_Pause,
     HK_Reset,
     HK_FastForward,
-    HK_FastForwardToggle,
+    HK_FrameLimitToggle,
     HK_FullscreenToggle,
     HK_SwapScreens,
     HK_SwapScreenEmphasis,
@@ -46,6 +46,9 @@ enum
     HK_PowerButton,
     HK_VolumeUp,
     HK_VolumeDown,
+    HK_SlowMo,
+    HK_FastForwardToggle,
+    HK_SlowMoToggle,
     HK_MAX
 };
 
@@ -252,7 +255,12 @@ public:
     std::unique_ptr<SaveManager> firmwareSave;
 
     bool doLimitFPS;
-    int maxFPS;
+    double curFPS;
+    double targetFPS;
+    double fastForwardFPS;
+    double slowmoFPS;
+    bool fastForwardToggled;
+    bool slowmoToggled;
     bool doAudioSync;
 private:
 

src/frontend/qt_sdl/EmuInstanceInput.cpp

@@ -47,7 +47,7 @@ const char* EmuInstance::hotkeyNames[HK_MAX] =
     "HK_Pause",
     "HK_Reset",
     "HK_FastForward",
-    "HK_FastForwardToggle",
+    "HK_FrameLimitToggle",
     "HK_FullscreenToggle",
     "HK_SwapScreens",
     "HK_SwapScreenEmphasis",
@@ -56,7 +56,10 @@ const char* EmuInstance::hotkeyNames[HK_MAX] =
     "HK_FrameStep",
     "HK_PowerButton",
     "HK_VolumeUp",
-    "HK_VolumeDown"
+    "HK_VolumeDown",
+    "HK_SlowMo",
+    "HK_FastForwardToggle",
+    "HK_SlowMoToggle"
 };
 
 

src/frontend/qt_sdl/EmuThread.cpp

@@ -149,12 +149,17 @@ void EmuThread::run()
 
     char melontitle[100];
 
+    bool fastforward = false;
+    bool slowmo = false;
+    emuInstance->fastForwardToggled = false;
+    emuInstance->slowmoToggled = false;
+
     while (emuStatus != emuStatus_Exit)
     {
         MPInterface::Get().Process();
         emuInstance->inputProcess();
 
-        if (emuInstance->hotkeyPressed(HK_FastForwardToggle)) emit windowLimitFPSChange();
+        if (emuInstance->hotkeyPressed(HK_FrameLimitToggle)) emit windowLimitFPSChange();
 
         if (emuInstance->hotkeyPressed(HK_Pause)) emuTogglePause();
         if (emuInstance->hotkeyPressed(HK_Reset)) emuReset();
@@ -332,22 +337,34 @@ void EmuThread::run()
                 emit windowUpdate();
                 winUpdateCount = 0;
             }
+            
+            if (emuInstance->hotkeyPressed(HK_FastForwardToggle)) emuInstance->fastForwardToggled = !emuInstance->fastForwardToggled;
+            if (emuInstance->hotkeyPressed(HK_SlowMoToggle)) emuInstance->slowmoToggled = !emuInstance->slowmoToggled;
 
-            bool fastforward = emuInstance->hotkeyDown(HK_FastForward);
+            bool enablefastforward = emuInstance->hotkeyDown(HK_FastForward) | emuInstance->fastForwardToggled;
+            bool enableslowmo = emuInstance->hotkeyDown(HK_SlowMo) | emuInstance->slowmoToggled;
 
             if (useOpenGL)
             {
-                // when using OpenGL: when toggling fast-forward, change the vsync interval
-                if (emuInstance->hotkeyPressed(HK_FastForward))
+                // when using OpenGL: when toggling fast-forward or slowmo, change the vsync interval
+                if ((enablefastforward || enableslowmo) && !(fastforward || slowmo))
                 {
                     emuInstance->setVSyncGL(false);
                 }
-                else if (emuInstance->hotkeyReleased(HK_FastForward))
+                else if (!(enablefastforward || enableslowmo) && (fastforward || slowmo))
                 {
                     emuInstance->setVSyncGL(true);
                 }
             }
 
+            fastforward = enablefastforward;
+            slowmo = enableslowmo;
+
+            if (slowmo) emuInstance->curFPS = emuInstance->slowmoFPS;
+            else if (fastforward) emuInstance->curFPS = emuInstance->fastForwardFPS;
+            else if (!emuInstance->doLimitFPS) emuInstance->curFPS = 1.0 / 1000.0;
+            else emuInstance->curFPS = emuInstance->targetFPS;
+
             if (emuInstance->audioDSiVolumeSync && emuInstance->nds->ConsoleType == 1)
             {
                 DSi* dsi = static_cast<DSi*>(emuInstance->nds);
@@ -361,23 +378,19 @@ void EmuThread::run()
                 emuInstance->audioVolume = volumeLevel * (256.0 / 31.0);
             }
 
-            if (emuInstance->doAudioSync && !fastforward)
+            if (emuInstance->doAudioSync && !(fastforward || slowmo))
                 emuInstance->audioSync();
 
             double frametimeStep = nlines / (60.0 * 263.0);
 
             {
-                bool limitfps = emuInstance->doLimitFPS && !fastforward;
-
-                double practicalFramelimit = limitfps ? frametimeStep : 1.0 / emuInstance->maxFPS;
-
                 double curtime = SDL_GetPerformanceCounter() * perfCountsSec;
 
-                frameLimitError += practicalFramelimit - (curtime - lastTime);
-                if (frameLimitError < -practicalFramelimit)
-                    frameLimitError = -practicalFramelimit;
-                if (frameLimitError > practicalFramelimit)
-                    frameLimitError = practicalFramelimit;
+                frameLimitError += emuInstance->curFPS - (curtime - lastTime);
+                if (frameLimitError < -emuInstance->curFPS)
+                    frameLimitError = -emuInstance->curFPS;
+                if (frameLimitError > emuInstance->curFPS)
+                    frameLimitError = emuInstance->curFPS;
 
                 if (round(frameLimitError * 1000.0) > 0.0)
                 {

src/frontend/qt_sdl/InputConfig/InputConfigDialog.h

@@ -49,6 +49,9 @@ static constexpr std::initializer_list<int> hk_general =
     HK_FrameStep,
     HK_FastForward,
     HK_FastForwardToggle,
+    HK_SlowMo,
+    HK_SlowMoToggle,
+    HK_FrameLimitToggle,
     HK_FullscreenToggle,
     HK_Lid,
     HK_Mic,
@@ -65,6 +68,9 @@ static constexpr std::initializer_list<const char*> hk_general_labels =
     "Reset",
     "Frame step",
     "Fast forward",
+    "Toggle fast forward",
+    "Slow mo",
+    "Toggle slow mo",
     "Toggle FPS limit",
     "Toggle fullscreen",
     "Close/open lid",

src/frontend/qt_sdl/InterfaceSettingsDialog.cpp

@@ -39,7 +39,9 @@ InterfaceSettingsDialog::InterfaceSettingsDialog(QWidget* parent) : QDialog(pare
     ui->spinMouseHideSeconds->setEnabled(ui->cbMouseHide->isChecked());
     ui->spinMouseHideSeconds->setValue(cfg.GetInt("MouseHideSeconds"));
     ui->cbPauseLostFocus->setChecked(cfg.GetBool("PauseLostFocus"));
-    ui->spinMaxFPS->setValue(cfg.GetInt("MaxFPS"));
+    ui->spinTargetFPS->setValue(cfg.GetDouble("TargetFPS"));
+    ui->spinFFW->setValue(cfg.GetDouble("FastForwardFPS"));
+    ui->spinSlow->setValue(cfg.GetDouble("SlowmoFPS"));
 
     const QList<QString> themeKeys = QStyleFactory::keys();
     const QString currentTheme = qApp->style()->objectName();
@@ -65,6 +67,41 @@ void InterfaceSettingsDialog::on_cbMouseHide_clicked()
     ui->spinMouseHideSeconds->setEnabled(ui->cbMouseHide->isChecked());
 }
 
+void InterfaceSettingsDialog::on_pbClean_clicked()
+{
+    ui->spinTargetFPS->setValue(60.0000);
+}
+
+void InterfaceSettingsDialog::on_pbAccurate_clicked()
+{
+    ui->spinTargetFPS->setValue(59.8261);
+}
+
+void InterfaceSettingsDialog::on_pb2x_clicked()
+{
+    ui->spinFFW->setValue(ui->spinTargetFPS->value() * 2.0);
+}
+
+void InterfaceSettingsDialog::on_pb3x_clicked()
+{
+    ui->spinFFW->setValue(ui->spinTargetFPS->value() * 3.0);
+}
+
+void InterfaceSettingsDialog::on_pbMAX_clicked()
+{
+    ui->spinFFW->setValue(1000.0);
+}
+
+void InterfaceSettingsDialog::on_pbHalf_clicked()
+{
+    ui->spinSlow->setValue(ui->spinTargetFPS->value() / 2.0);
+}
+
+void InterfaceSettingsDialog::on_pbQuarter_clicked()
+{
+    ui->spinSlow->setValue(ui->spinTargetFPS->value() / 4.0);
+}
+
 void InterfaceSettingsDialog::done(int r)
 {
     if (r == QDialog::Accepted)
@@ -74,7 +111,18 @@ void InterfaceSettingsDialog::done(int r)
         cfg.SetBool("MouseHide", ui->cbMouseHide->isChecked());
         cfg.SetInt("MouseHideSeconds", ui->spinMouseHideSeconds->value());
         cfg.SetBool("PauseLostFocus", ui->cbPauseLostFocus->isChecked());
-        cfg.SetInt("MaxFPS", ui->spinMaxFPS->value());
+
+        double val = ui->spinTargetFPS->value();
+        if (val == 0.0) cfg.SetDouble("TargetFPS", 0.0001);
+        else cfg.SetDouble("TargetFPS", val);
+        
+        val = ui->spinFFW->value();
+        if (val == 0.0) cfg.SetDouble("FastForwardFPS", 0.0001);
+        else cfg.SetDouble("FastForwardFPS", val);
+        
+        val = ui->spinSlow->value();
+        if (val == 0.0) cfg.SetDouble("SlowmoFPS", 0.0001);
+        else cfg.SetDouble("SlowmoFPS", val);
 
         QString themeName = ui->cbxUITheme->currentData().toString();
         cfg.SetQString("UITheme", themeName);

src/frontend/qt_sdl/InterfaceSettingsDialog.h

@@ -60,6 +60,16 @@ private slots:
 
     void on_cbMouseHide_clicked();
 
+    void on_pbClean_clicked();
+    void on_pbAccurate_clicked();
+
+    void on_pb2x_clicked();
+    void on_pb3x_clicked();
+    void on_pbMAX_clicked();
+
+    void on_pbHalf_clicked();
+    void on_pbQuarter_clicked();
+
 private:
     Ui::InterfaceSettingsDialog* ui;
 

src/frontend/qt_sdl/InterfaceSettingsDialog.ui

@@ -6,12 +6,12 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>337</width>
-    <height>275</height>
+    <width>389</width>
+    <height>356</height>
    </rect>
   </property>
   <property name="sizePolicy">
-   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+   <sizepolicy hsizetype="Minimum" vsizetype="Minimum">
     <horstretch>0</horstretch>
     <verstretch>0</verstretch>
    </sizepolicy>
@@ -20,6 +20,9 @@
    <string>Interface settings - melonDS</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout" stretch="0,0,0">
+   <property name="sizeConstraint">
+    <enum>QLayout::SizeConstraint::SetFixedSize</enum>
+   </property>
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
@@ -95,32 +98,209 @@
      <property name="title">
       <string>Framerate </string>
      </property>
-     <layout class="QHBoxLayout" name="horizontalLayout_4" stretch="0,0">
+     <layout class="QVBoxLayout" name="verticalLayout_5">
       <item>
-       <widget class="QLabel" name="label_3">
-        <property name="text">
-         <string>Fast-forward limit</string>
+       <layout class="QGridLayout" name="gridLayout">
+        <property name="horizontalSpacing">
+         <number>6</number>
         </property>
-        <property name="buddy">
-         <cstring>spinMaxFPS</cstring>
+        <property name="verticalSpacing">
+         <number>2</number>
         </property>
-       </widget>
-      </item>
-      <item>
-       <widget class="QSpinBox" name="spinMaxFPS">
-        <property name="suffix">
-         <string> FPS</string>
-        </property>
-        <property name="minimum">
-         <number>60</number>
-        </property>
-        <property name="maximum">
-         <number>1000</number>
-        </property>
-        <property name="value">
-         <number>1000</number>
-        </property>
-       </widget>
+        <item row="0" column="0">
+         <widget class="QLabel" name="label_5">
+          <property name="text">
+           <string>Target FPS</string>
+          </property>
+         </widget>
+        </item>
+        <item row="1" column="0">
+         <widget class="QLabel" name="label_3">
+          <property name="text">
+           <string>Fast-Forward</string>
+          </property>
+          <property name="buddy">
+           <cstring>spinFFW</cstring>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="1">
+         <widget class="QDoubleSpinBox" name="spinTargetFPS">
+          <property name="suffix">
+           <string> FPS</string>
+          </property>
+          <property name="decimals">
+           <number>4</number>
+          </property>
+          <property name="minimum">
+           <double>0.000100000000000</double>
+          </property>
+          <property name="maximum">
+           <double>1000.000000000000000</double>
+          </property>
+          <property name="value">
+           <double>59.826099999999997</double>
+          </property>
+         </widget>
+        </item>
+        <item row="2" column="2">
+         <layout class="QHBoxLayout" name="horizontalLayout_5">
+          <property name="spacing">
+           <number>2</number>
+          </property>
+          <item>
+           <widget class="QPushButton" name="pbQuarter">
+            <property name="maximumSize">
+             <size>
+              <width>63</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>1/4</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pbHalf">
+            <property name="maximumSize">
+             <size>
+              <width>62</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>1/2</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+        <item row="2" column="1">
+         <widget class="QDoubleSpinBox" name="spinSlow">
+          <property name="suffix">
+           <string> FPS</string>
+          </property>
+          <property name="decimals">
+           <number>4</number>
+          </property>
+          <property name="minimum">
+           <double>0.000100000000000</double>
+          </property>
+          <property name="maximum">
+           <double>1000.000000000000000</double>
+          </property>
+          <property name="value">
+           <double>29.913000000000000</double>
+          </property>
+         </widget>
+        </item>
+        <item row="1" column="1">
+         <widget class="QDoubleSpinBox" name="spinFFW">
+          <property name="suffix">
+           <string> FPS</string>
+          </property>
+          <property name="decimals">
+           <number>4</number>
+          </property>
+          <property name="minimum">
+           <double>0.000100000000000</double>
+          </property>
+          <property name="maximum">
+           <double>1000.000000000000000</double>
+          </property>
+          <property name="value">
+           <double>1000.000000000000000</double>
+          </property>
+         </widget>
+        </item>
+        <item row="2" column="0">
+         <widget class="QLabel" name="label_6">
+          <property name="text">
+           <string>Slow-Mo</string>
+          </property>
+         </widget>
+        </item>
+        <item row="0" column="2">
+         <layout class="QHBoxLayout" name="horizontalLayout_10">
+          <property name="spacing">
+           <number>2</number>
+          </property>
+          <item>
+           <widget class="QPushButton" name="pbAccurate">
+            <property name="maximumSize">
+             <size>
+              <width>63</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>Accurate</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pbClean">
+            <property name="maximumSize">
+             <size>
+              <width>62</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>Clean</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+        <item row="1" column="2">
+         <layout class="QHBoxLayout" name="horizontalLayout_9">
+          <property name="spacing">
+           <number>2</number>
+          </property>
+          <item>
+           <widget class="QPushButton" name="pb2x">
+            <property name="maximumSize">
+             <size>
+              <width>41</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>2x</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pb3x">
+            <property name="maximumSize">
+             <size>
+              <width>41</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>3x</string>
+            </property>
+           </widget>
+          </item>
+          <item>
+           <widget class="QPushButton" name="pbMAX">
+            <property name="maximumSize">
+             <size>
+              <width>41</width>
+              <height>16777215</height>
+             </size>
+            </property>
+            <property name="text">
+             <string>MAX</string>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </item>
+       </layout>
       </item>
      </layout>
     </widget>
@@ -128,10 +308,10 @@
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
-      <enum>Qt::Horizontal</enum>
+      <enum>Qt::Orientation::Horizontal</enum>
      </property>
      <property name="standardButtons">
-      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+      <set>QDialogButtonBox::StandardButton::Cancel|QDialogButtonBox::StandardButton::Ok</set>
      </property>
     </widget>
    </item>

src/frontend/qt_sdl/Window.cpp

@@ -1946,8 +1946,9 @@ void MainWindow::onOpenInterfaceSettings()
 void MainWindow::onUpdateInterfaceSettings()
 {
     pauseOnLostFocus = globalCfg.GetBool("PauseLostFocus");
-    emuInstance->maxFPS = globalCfg.GetInt("MaxFPS");
-
+    emuInstance->targetFPS = 1.0 / globalCfg.GetDouble("TargetFPS");
+    emuInstance->fastForwardFPS = 1.0 / globalCfg.GetDouble("FastForwardFPS");
+    emuInstance->slowmoFPS = 1.0 / globalCfg.GetDouble("SlowmoFPS");
     panel->setMouseHide(globalCfg.GetBool("MouseHide"),
                         globalCfg.GetInt("MouseHideSeconds")*1000);
 }