[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>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/common/settings.cpp b/src/common/settings.cpp
index 5d8a0e41f6..c952567e63 100644
--- a/src/common/settings.cpp
+++ b/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