[frontend] Slow and Turbo modes (#3525)

Closes #3344

Adds slow and turbo modes with configurable speeds that can then be
toggled by the user. Behavior is:
- Standard/slow limit, toggle turbo = turbo
- Turbo limit, toggle turbo = standard
- Standard/turbo limit, toggle slow = slow
- Slow limit, toggle slow = standard

Enabling the turbo/slow mode enables the frame limiter unconditionally.

This has some conflicts with VSync. For example when I set my refresh
rate to 60hz and enable vsync, turbo mode does nothing. Not sure how to
go about fixing this, @MaranBr probably knows better the proper
solution.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3525
Reviewed-by: DraVee <dravee@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/common/settings.cpp

@@ -379,4 +379,52 @@ void SetConfiguringGlobal(bool is_global) {
     configuring_global = is_global;
 }
 
+u16 SpeedLimit() {
+    switch (SpeedMode(values.current_speed_mode)) {
+    case SpeedMode::Standard:
+        return values.speed_limit.GetValue();
+    case SpeedMode::Turbo:
+        return values.turbo_speed_limit.GetValue();
+    case SpeedMode::Slow:
+        return values.slow_speed_limit.GetValue();
+    default:
+        UNIMPLEMENTED();
+    }
+
+    return 100;
+}
+
+void SetSpeedMode(const SpeedMode& mode) {
+    values.current_speed_mode.SetValue(mode);
+
+    switch (mode) {
+    case SpeedMode::Turbo:
+    case SpeedMode::Slow:
+        values.use_speed_limit.SetValue(true);
+        break;
+    case SpeedMode::Standard:
+    default:
+        break;
+    }
+}
+
+void ToggleStandardMode() {
+    values.use_speed_limit.SetValue(!values.use_speed_limit.GetValue());
+    SetSpeedMode(SpeedMode::Standard);
+}
+
+void ToggleTurboMode() {
+    if (values.current_speed_mode.GetValue() != SpeedMode::Turbo)
+        SetSpeedMode(SpeedMode::Turbo);
+    else
+        SetSpeedMode(SpeedMode::Standard);
+}
+
+void ToggleSlowMode() {
+    if (values.current_speed_mode.GetValue() != SpeedMode::Slow)
+        SetSpeedMode(SpeedMode::Slow);
+    else
+        SetSpeedMode(SpeedMode::Standard);
+}
+
 } // namespace Settings

src/common/settings.h

@@ -204,6 +204,7 @@ struct Values {
                                                              true};
     SwitchableSetting<bool> use_speed_limit{
                                             linkage, true, "use_speed_limit", Category::Core, Specialization::Paired, true, true};
+
     SwitchableSetting<u16, true> speed_limit{linkage,
                                              100,
                                              0,
@@ -214,6 +215,30 @@ struct Values {
                                              true,
                                              true,
                                              &use_speed_limit};
+
+    SwitchableSetting<u16, true> slow_speed_limit{linkage,
+                                             50,
+                                             0,
+                                             9999,
+                                             "slow_speed_limit",
+                                             Category::Core,
+                                             Specialization::Countable | Specialization::Percentage,
+                                             true,
+                                             true};
+
+    SwitchableSetting<u16, true> turbo_speed_limit{linkage,
+                                             200,
+                                             0,
+                                             9999,
+                                             "turbo_speed_limit",
+                                             Category::Core,
+                                             Specialization::Countable | Specialization::Percentage,
+                                             true,
+                                             true};
+
+    // The currently used speed mode.
+    Setting<SpeedMode> current_speed_mode{linkage, SpeedMode::Standard, "current_speed_mode", Category::Core, Specialization::Default, false, true};
+
     SwitchableSetting<bool> sync_core_speed{linkage, false, "sync_core_speed", Category::Core,
                                             Specialization::Default};
 
@@ -824,6 +849,13 @@ bool IsDockedMode();
 
 float Volume();
 
+// speed limit ops
+u16 SpeedLimit();
+void SetSpeedMode(const SpeedMode &mode);
+void ToggleStandardMode();
+void ToggleTurboMode();
+void ToggleSlowMode();
+
 std::string GetTimeZoneString(TimeZone time_zone);
 
 void LogSettings();

src/common/settings_enums.h

@@ -157,6 +157,7 @@ ENUM(TemperatureUnits, Celsius, Fahrenheit)
 ENUM(ExtendedDynamicState, Disabled, EDS1, EDS2, EDS3);
 ENUM(GpuLogLevel, Off, Errors, Standard, Verbose, All)
 ENUM(GameListMode, TreeView, GridView);
+ENUM(SpeedMode, Standard, Turbo, Slow);
 
 template <typename Type>
 inline std::string_view CanonicalizeEnum(Type id) {