From f29fe15d77122d6ddfc6bd30ff91680a6bcbecb8 Mon Sep 17 00:00:00 2001
From: TryTwo <taolas@gmail.com>
Date: Fri, 17 May 2024 21:16:59 -0700
Subject: [PATCH] FrameAdvance:  Fix continuous frame advancing while the debug
 UI is open.  Blocks signals from being spammed to update the UI.

---
 Source/Core/DolphinQt/Host.cpp            |  3 +++
 Source/Core/DolphinQt/HotkeyScheduler.cpp |  4 ++++
 Source/Core/DolphinQt/Settings.cpp        | 17 ++++++++++++++++-
 Source/Core/DolphinQt/Settings.h          |  5 +++++
 4 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/Source/Core/DolphinQt/Host.cpp b/Source/Core/DolphinQt/Host.cpp
index bb912a7ab2..80a4247a2b 100644
--- a/Source/Core/DolphinQt/Host.cpp
+++ b/Source/Core/DolphinQt/Host.cpp
@@ -250,6 +250,9 @@ void Host_YieldToUI()
 
 void Host_UpdateDisasmDialog()
 {
+  if (Settings::Instance().GetIsContinuouslyFrameStepping())
+    return;
+
   QueueOnObject(QApplication::instance(), [] { emit Host::GetInstance()->UpdateDisasmDialog(); });
 }
 
diff --git a/Source/Core/DolphinQt/HotkeyScheduler.cpp b/Source/Core/DolphinQt/HotkeyScheduler.cpp
index 81ed0bbbe2..33b4df8ed0 100644
--- a/Source/Core/DolphinQt/HotkeyScheduler.cpp
+++ b/Source/Core/DolphinQt/HotkeyScheduler.cpp
@@ -113,6 +113,8 @@ static void HandleFrameStepHotkeys()
 
     if ((frame_step_count == 0 || frame_step_count == FRAME_STEP_DELAY) && !frame_step_hold)
     {
+      if (frame_step_count > 0)
+        Settings::Instance().SetIsContinuouslyFrameStepping(true);
       Core::QueueHostJob([](auto& system) { Core::DoFrameStep(system); });
       frame_step_hold = true;
     }
@@ -138,6 +140,8 @@ static void HandleFrameStepHotkeys()
     frame_step_count = 0;
     frame_step_hold = false;
     frame_step_delay_count = 0;
+    Settings::Instance().SetIsContinuouslyFrameStepping(false);
+    emit Settings::Instance().EmulationStateChanged(Core::GetState(Core::System::GetInstance()));
   }
 }
 
diff --git a/Source/Core/DolphinQt/Settings.cpp b/Source/Core/DolphinQt/Settings.cpp
index 4ab29c3e0f..195cf16579 100644
--- a/Source/Core/DolphinQt/Settings.cpp
+++ b/Source/Core/DolphinQt/Settings.cpp
@@ -59,7 +59,12 @@ Settings::Settings()
 {
   qRegisterMetaType<Core::State>();
   Core::AddOnStateChangedCallback([this](Core::State new_state) {
-    QueueOnObject(this, [this, new_state] { emit EmulationStateChanged(new_state); });
+    QueueOnObject(this, [this, new_state] {
+      // Avoid signal spam while continuously frame stepping. Will still send a signal for the first
+      // and last framestep.
+      if (!m_continuously_frame_stepping)
+        emit EmulationStateChanged(new_state);
+    });
   });
 
   Config::AddConfigChangedCallback([this] {
@@ -827,3 +832,13 @@ void Settings::SetUSBKeyboardConnected(bool connected)
     emit USBKeyboardConnectionChanged(connected);
   }
 }
+
+void Settings::SetIsContinuouslyFrameStepping(bool is_stepping)
+{
+  m_continuously_frame_stepping = is_stepping;
+}
+
+bool Settings::GetIsContinuouslyFrameStepping() const
+{
+  return m_continuously_frame_stepping;
+}
diff --git a/Source/Core/DolphinQt/Settings.h b/Source/Core/DolphinQt/Settings.h
index a99e8c7dca..68223e62f6 100644
--- a/Source/Core/DolphinQt/Settings.h
+++ b/Source/Core/DolphinQt/Settings.h
@@ -120,6 +120,9 @@ public:
   bool IsUSBKeyboardConnected() const;
   void SetUSBKeyboardConnected(bool connected);
 
+  void SetIsContinuouslyFrameStepping(bool is_stepping);
+  bool GetIsContinuouslyFrameStepping() const;
+
   // Graphics
   Config::ShowCursor GetCursorVisibility() const;
   bool GetLockCursor() const;
@@ -228,6 +231,8 @@ private:
   Settings();
 
   bool m_batch = false;
+  std::atomic<bool> m_continuously_frame_stepping = false;
+
   std::shared_ptr<NetPlay::NetPlayClient> m_client;
   std::shared_ptr<NetPlay::NetPlayServer> m_server;
   ControllerInterface::HotplugCallbackHandle m_hotplug_callback_handle;