[DesktopVRSwitch] Prevent SteamVR_Behaviour from closing game.

Was going to use my own event and switch before quit, but SteamVR_Behaviour was the one doing it the entire time. Very convenient for me.

DesktopVRSwitch/HarmonyPatches.cs

@@ -8,6 +8,7 @@ using HarmonyLib;
 using NAK.DesktopVRSwitch.Patches;
 using NAK.DesktopVRSwitch.VRModeTrackers;
 using UnityEngine;
+using Valve.VR;
 
 namespace NAK.DesktopVRSwitch.HarmonyPatches;
 
@@ -110,4 +111,21 @@ class CohtmlUISystemPatches
         // dont
         return false;
     }
+}
+
+class SteamVRBehaviourPatches
+{
+    [HarmonyPrefix]
+    [HarmonyPatch(typeof(SteamVR_Behaviour), nameof(SteamVR_Behaviour.OnQuit))]
+    static bool Prefix_SteamVR_Behaviour_OnQuit()
+    {
+        if (DesktopVRSwitch.EntrySwitchToDesktopOnExit.Value)
+        {
+            // If we don't switch fast enough, SteamVR will force close.
+            // World Transition might cause issues. Might need to override.
+            VRModeSwitchManager.Instance?.AttemptSwitch();
+            return false;
+        }
+        return true;
+    }
 }

DesktopVRSwitch/Main.cs

@@ -32,7 +32,10 @@ public class DesktopVRSwitch : MelonMod
         Category.CreateEntry("Use Transition on Switch", true, description: "Should the world transition play on VRMode switch?");
 
     public static readonly MelonPreferences_Entry<bool> EntryRenderVRGameView =
-        Category.CreateEntry("Render VR Game View", true, description: "Should the VR view be displayed in the game window?");
+        Category.CreateEntry("Render VR Game View", true, description: "Should the VR view be displayed in the game window after VRMode switch?");
+
+    public static readonly MelonPreferences_Entry<bool> EntrySwitchToDesktopOnExit =
+        Category.CreateEntry("Switch to Desktop on SteamVR Exit", true, description: "Should the game switch to Desktop when SteamVR quits?");
 
     public override void OnInitializeMelon()
     {
@@ -52,6 +55,9 @@ public class DesktopVRSwitch : MelonMod
         ApplyPatches(typeof(HarmonyPatches.CVRWorldPatches));
         // cohtml gamepad handling nuke
         ApplyPatches(typeof(HarmonyPatches.CohtmlUISystemPatches));
+
+        // prevent steamvr behaviour from closing game
+        ApplyPatches(typeof(HarmonyPatches.SteamVRBehaviourPatches));
     }
 
     public override void OnUpdate()

DesktopVRSwitch/VRModeSwitchDebugger.cs

@@ -5,25 +5,29 @@ namespace NAK.DesktopVRSwitch;
 
 class VRModeSwitchDebugger : MonoBehaviour
 {
-    private Coroutine _switchCoroutine;
+    Coroutine _switchCoroutine;
-    private WaitForSeconds _sleep = new WaitForSeconds(2.5f);
+    WaitForSeconds _sleep;
 
-    private void OnEnable()
+    void OnEnable()
     {
         if (_switchCoroutine == null)
+        {
             _switchCoroutine = StartCoroutine(SwitchLoop());
+            _sleep = new WaitForSeconds(2f);
+        }
     }
 
-    private void OnDisable()
+    void OnDisable()
     {
         if (_switchCoroutine != null)
         {
             StopCoroutine(_switchCoroutine);
             _switchCoroutine = null;
+            _sleep = null;
         }
     }
 
-    private IEnumerator SwitchLoop()
+    IEnumerator SwitchLoop()
     {
         while (true)
         {
@@ -32,7 +36,6 @@ class VRModeSwitchDebugger : MonoBehaviour
                 VRModeSwitchManager.Instance.AttemptSwitch();
                 yield return _sleep;
             }
-
             yield return null;
         }
     }