NetPlay: Sync power button event

This fixes the deadlock on shutdown when Wii Remotes are in use.

Source/Core/Core/NetPlayClient.cpp

@@ -568,6 +568,12 @@ unsigned int NetPlayClient::OnData(sf::Packet& packet)
   }
   break;
 
+  case NP_MSG_POWER_BUTTON:
+  {
+    m_dialog->OnMsgPowerButton();
+  }
+  break;
+
   case NP_MSG_PING:
   {
     u32 ping_key = 0;
@@ -1701,6 +1707,13 @@ void NetPlayClient::RequestStopGame()
     SendStopGamePacket();
 }
 
+void NetPlayClient::SendPowerButtonEvent()
+{
+  sf::Packet packet;
+  packet << static_cast<MessageId>(NP_MSG_POWER_BUTTON);
+  SendAsync(std::move(packet));
+}
+
 // called from ---GUI--- thread
 bool NetPlayClient::LocalPlayerHasControllerMapped() const
 {
@@ -1883,6 +1896,12 @@ void SetSIPollBatching(bool state)
   s_si_poll_batching = state;
 }
 
+void SendPowerButtonEvent()
+{
+  ASSERT(IsNetPlayRunning());
+  netplay_client->SendPowerButtonEvent();
+}
+
 void NetPlay_Enable(NetPlayClient* const np)
 {
   std::lock_guard<std::mutex> lk(crit_netplay_client);

Source/Core/Core/NetPlayClient.h

@@ -43,6 +43,7 @@ public:
   virtual void OnMsgChangeGame(const std::string& filename) = 0;
   virtual void OnMsgStartGame() = 0;
   virtual void OnMsgStopGame() = 0;
+  virtual void OnMsgPowerButton() = 0;
   virtual void OnPadBufferChanged(u32 buffer) = 0;
   virtual void OnHostInputAuthorityChanged(bool enabled) = 0;
   virtual void OnDesync(u32 frame, const std::string& player) = 0;
@@ -102,6 +103,7 @@ public:
   bool ChangeGame(const std::string& game);
   void SendChatMessage(const std::string& msg);
   void RequestStopGame();
+  void SendPowerButtonEvent();
 
   // Send and receive pads values
   bool WiimoteUpdate(int _number, u8* data, const u8 size, u8 reporting_mode);

Source/Core/Core/NetPlayProto.h

@@ -124,6 +124,7 @@ enum
   NP_MSG_GAME_STATUS = 0xA4,
   NP_MSG_IPL_STATUS = 0xA5,
   NP_MSG_HOST_INPUT_AUTHORITY = 0xA6,
+  NP_MSG_POWER_BUTTON = 0xA7,
 
   NP_MSG_TIMEBASE = 0xB0,
   NP_MSG_DESYNC_DETECTED = 0xB1,
@@ -180,4 +181,5 @@ IOS::HLE::FS::FileSystem* GetWiiSyncFS();
 void SetWiiSyncFS(std::unique_ptr<IOS::HLE::FS::FileSystem> fs);
 void ClearWiiSyncFS();
 void SetSIPollBatching(bool state);
+void SendPowerButtonEvent();
 }  // namespace NetPlay

Source/Core/Core/NetPlayServer.cpp

@@ -743,6 +743,14 @@ unsigned int NetPlayServer::OnData(sf::Packet& packet, Client& player)
   }
   break;
 
+  case NP_MSG_POWER_BUTTON:
+  {
+    sf::Packet spac;
+    spac << static_cast<MessageId>(NP_MSG_POWER_BUTTON);
+    SendToClients(spac, player.pid);
+  }
+  break;
+
   case NP_MSG_TIMEBASE:
   {
     u64 timebase = Common::PacketReadU64(packet);

Source/Core/DolphinQt/MainWindow.cpp

@@ -744,6 +744,10 @@ bool MainWindow::RequestStop()
     if (Core::GetState() == Core::State::Paused)
       Core::SetState(Core::State::Running);
 
+    // Tell NetPlay about the power event
+    if (NetPlay::IsNetPlayRunning())
+      NetPlay::SendPowerButtonEvent();
+
     return true;
   }
 

Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp

@@ -54,6 +54,7 @@
 
 #include "UICommon/DiscordPresence.h"
 #include "UICommon/GameFile.h"
+#include "UICommon/UICommon.h"
 
 #include "VideoCommon/VideoConfig.h"
 
@@ -796,6 +797,13 @@ void NetPlayDialog::OnMsgStopGame()
   QueueOnObject(this, [this] { UpdateDiscordPresence(); });
 }
 
+void NetPlayDialog::OnMsgPowerButton()
+{
+  if (!Core::IsRunning())
+    return;
+  QueueOnObject(this, [] { UICommon::TriggerSTMPowerEvent(); });
+}
+
 void NetPlayDialog::OnPadBufferChanged(u32 buffer)
 {
   QueueOnObject(this, [this, buffer] {

Source/Core/DolphinQt/NetPlay/NetPlayDialog.h

@@ -46,6 +46,7 @@ public:
   void OnMsgChangeGame(const std::string& filename) override;
   void OnMsgStartGame() override;
   void OnMsgStopGame() override;
+  void OnMsgPowerButton() override;
   void OnPadBufferChanged(u32 buffer) override;
   void OnHostInputAuthorityChanged(bool enabled) override;
   void OnDesync(u32 frame, const std::string& player) override;