Implement Cursor Locking and new input focus checks for it

Source/Core/Core/ConfigManager.cpp

@@ -147,6 +147,7 @@ void SConfig::SaveInterfaceSettings(IniFile& ini)
 
   interface->Set("ConfirmStop", bConfirmStop);
   interface->Set("HideCursor", bHideCursor);
+  interface->Set("LockCursor", bLockCursor);
   interface->Set("LanguageCode", m_InterfaceLanguage);
   interface->Set("ExtendedFPSInfo", m_InterfaceExtendedFPSInfo);
   interface->Set("ShowActiveTitle", m_show_active_title);
@@ -401,6 +402,7 @@ void SConfig::LoadInterfaceSettings(IniFile& ini)
 
   interface->Get("ConfirmStop", &bConfirmStop, true);
   interface->Get("HideCursor", &bHideCursor, false);
+  interface->Get("LockCursor", &bLockCursor, false);
   interface->Get("LanguageCode", &m_InterfaceLanguage, "");
   interface->Get("ExtendedFPSInfo", &m_InterfaceExtendedFPSInfo, false);
   interface->Get("ShowActiveTitle", &m_show_active_title, true);

Source/Core/Core/ConfigManager.h

@@ -150,6 +150,7 @@ struct SConfig
   // Interface settings
   bool bConfirmStop = false;
   bool bHideCursor = false;
+  bool bLockCursor = false;
   std::string theme_name;
 
   // Bluetooth passthrough mode settings

Source/Core/Core/Core.cpp

@@ -1113,10 +1113,15 @@ void DoFrameStep()
   }
 }
 
-void UpdateInputGate(bool require_focus)
+void UpdateInputGate(bool require_focus, bool require_full_focus)
 {
-  ControlReference::SetInputGate((!require_focus || Host_RendererHasFocus()) &&
-                                 !Host_UIBlocksControllerState());
+  // If the user accepts background input, controls should pass even if an on screen interface is on
+  const bool focus_passes =
+      !require_focus || (Host_RendererHasFocus() && !Host_UIBlocksControllerState());
+  // Ignore full focus if we don't require basic focus
+  const bool full_focus_passes =
+      !require_focus || !require_full_focus || (focus_passes && Host_RendererHasFullFocus());
+  ControlReference::SetInputGate(focus_passes && full_focus_passes);
 }
 
 }  // namespace Core

Source/Core/Core/Core.h

@@ -169,6 +169,6 @@ void HostDispatchJobs();
 
 void DoFrameStep();
 
-void UpdateInputGate(bool require_focus);
+void UpdateInputGate(bool require_focus, bool require_full_focus = false);
 
 }  // namespace Core

Source/Core/Core/HW/VideoInterface.cpp

@@ -867,7 +867,8 @@ void Update(u64 ticks)
 
   if (s_half_line_of_next_si_poll == s_half_line_count)
   {
-    Core::UpdateInputGate(!SConfig::GetInstance().m_BackgroundInput);
+    Core::UpdateInputGate(!SConfig::GetInstance().m_BackgroundInput,
+                          SConfig::GetInstance().bLockCursor);
     SerialInterface::UpdateDevices();
     s_half_line_of_next_si_poll += 2 * SerialInterface::GetPollXLines();
   }

Source/Core/Core/Host.h

@@ -36,6 +36,7 @@ enum class HostMessageID
 std::vector<std::string> Host_GetPreferredLocales();
 bool Host_UIBlocksControllerState();
 bool Host_RendererHasFocus();
+bool Host_RendererHasFullFocus();
 bool Host_RendererIsFullscreen();
 
 void Host_Message(HostMessageID id);

Source/Core/Core/HotkeyManager.cpp

@@ -24,7 +24,7 @@
 #include "InputCommon/GCPadStatus.h"
 
 // clang-format off
-constexpr std::array<const char*, 125> s_hotkey_labels{{
+constexpr std::array<const char*, 126> s_hotkey_labels{{
     _trans("Open"),
     _trans("Change Disc"),
     _trans("Eject Disc"),
@@ -35,6 +35,7 @@ constexpr std::array<const char*, 125> s_hotkey_labels{{
     _trans("Toggle Fullscreen"),
     _trans("Take Screenshot"),
     _trans("Exit"),
+    _trans("Unlock Cursor"),
     _trans("Activate NetPlay Chat"),
     _trans("Control NetPlay Golf Mode"),
 

Source/Core/Core/HotkeyManager.h

@@ -29,6 +29,7 @@ enum Hotkey
   HK_FULLSCREEN,
   HK_SCREENSHOT,
   HK_EXIT,
+  HK_UNLOCK_CURSOR,
   HK_ACTIVATE_CHAT,
   HK_REQUEST_GOLF_CONTROL,