Add custom refresh rate mode to VSync option (#238)

Rebased @jcm93's refreshinterval branch:
https://github.com/jcm93/Ryujinx/tree/refreshinterval

The option is placed under System/Hacks. Disabled, it's the default
Ryujinx behavior. Enabled, the behavior is shown in the attached
screenshots. If a framerate is too high or low, you can adjust the value
where you normally toggle VSync on and off. It will also cycle through
the default on/off toggles.

Also, in order to reduce clutter, I made an adjustment to remove the
target FPS and only show the percentage.

---------

Co-authored-by: jcm <6864788+jcm93@users.noreply.github.com>

src/Ryujinx.Headless.SDL2/Options.cs

@@ -115,8 +115,11 @@ namespace Ryujinx.Headless.SDL2
         [Option("fs-global-access-log-mode", Required = false, Default = 0, HelpText = "Enables FS access log output to the console.")]
         public int FsGlobalAccessLogMode { get; set; }
 
-        [Option("disable-vsync", Required = false, HelpText = "Disables Vertical Sync.")]
-        public bool DisableVSync { get; set; }
+        [Option("vsync-mode", Required = false, Default = VSyncMode.Switch, HelpText = "Sets the emulated VSync mode (Switch, Unbounded, or Custom).")]
+        public VSyncMode VSyncMode { get; set; }
+
+        [Option("custom-refresh-rate", Required = false, Default = 90, HelpText = "Sets the custom refresh rate target value (integer).")]
+        public int CustomVSyncInterval { get; set; }
 
         [Option("disable-shader-cache", Required = false, HelpText = "Disables Shader cache.")]
         public bool DisableShaderCache { get; set; }

src/Ryujinx.Headless.SDL2/Program.cs

@@ -563,7 +563,7 @@ namespace Ryujinx.Headless.SDL2
                 window,
                 options.SystemLanguage,
                 options.SystemRegion,
-                !options.DisableVSync,
+                options.VSyncMode,
                 !options.DisableDockedMode,
                 !options.DisablePTC,
                 options.EnableInternetAccess,
@@ -580,7 +580,8 @@ namespace Ryujinx.Headless.SDL2
                 Common.Configuration.Multiplayer.MultiplayerMode.Disabled,
                 false,
                 "",
-                "");
+                "",
+                options.CustomVSyncInterval);
 
             return new Switch(configuration);
         }

src/Ryujinx.Headless.SDL2/StatusUpdatedEventArgs.cs

@@ -3,7 +3,7 @@ using System;
 namespace Ryujinx.Headless.SDL2
 {
     class StatusUpdatedEventArgs(
-        bool vSyncEnabled,
+        string vSyncMode,
         string dockedMode,
         string aspectRatio,
         string gameStatus,
@@ -11,7 +11,7 @@ namespace Ryujinx.Headless.SDL2
         string gpuName)
         : EventArgs
     {
-        public bool VSyncEnabled = vSyncEnabled;
+        public string VSyncMode = vSyncMode;
         public string DockedMode = dockedMode;
         public string AspectRatio = aspectRatio;
         public string GameStatus = gameStatus;

src/Ryujinx.Headless.SDL2/WindowBase.cs

@@ -314,7 +314,7 @@ namespace Ryujinx.Headless.SDL2
                         }
 
                         StatusUpdatedEvent?.Invoke(this, new StatusUpdatedEventArgs(
-                            Device.EnableDeviceVsync,
+                            Device.VSyncMode.ToString(),
                             dockedMode,
                             Device.Configuration.AspectRatio.ToText(),
                             $"Game: {Device.Statistics.GetGameFrameRate():00.00} FPS ({Device.Statistics.GetGameFrameTime():00.00} ms)",