InputCommon: Add setting to enable GCAdapter ControllerInterface backend.

Source/Core/Core/Config/MainSettings.cpp

@@ -186,6 +186,8 @@ const Info<bool> MAIN_WIIMOTE_CONTINUOUS_SCANNING{
 const Info<bool> MAIN_WIIMOTE_ENABLE_SPEAKER{{System::Main, "Core", "WiimoteEnableSpeaker"}, false};
 const Info<bool> MAIN_CONNECT_WIIMOTES_FOR_CONTROLLER_INTERFACE{
     {System::Main, "Core", "WiimoteControllerInterface"}, false};
+const Info<bool> MAIN_USE_GC_ADAPTER_FOR_CONTROLLER_INTERFACE{
+    {System::Main, "Core", "GCAdapterControllerInterface"}, false};
 const Info<bool> MAIN_MMU{{System::Main, "Core", "MMU"}, false};
 const Info<bool> MAIN_PAUSE_ON_PANIC{{System::Main, "Core", "PauseOnPanic"}, false};
 const Info<int> MAIN_BB_DUMP_PORT{{System::Main, "Core", "BBDumpPort"}, -1};

Source/Core/Core/Config/MainSettings.h

@@ -106,6 +106,7 @@ extern const Info<bool> MAIN_WII_KEYBOARD;
 extern const Info<bool> MAIN_WIIMOTE_CONTINUOUS_SCANNING;
 extern const Info<bool> MAIN_WIIMOTE_ENABLE_SPEAKER;
 extern const Info<bool> MAIN_CONNECT_WIIMOTES_FOR_CONTROLLER_INTERFACE;
+extern const Info<bool> MAIN_USE_GC_ADAPTER_FOR_CONTROLLER_INTERFACE;
 extern const Info<bool> MAIN_MMU;
 extern const Info<bool> MAIN_PAUSE_ON_PANIC;
 extern const Info<int> MAIN_BB_DUMP_PORT;

Source/Core/DolphinQt/Config/GamecubeControllersWidget.cpp

@@ -3,6 +3,7 @@
 
 #include "DolphinQt/Config/GamecubeControllersWidget.h"
 
+#include <QCheckBox>
 #include <QComboBox>
 #include <QGridLayout>
 #include <QGroupBox>
@@ -95,6 +96,10 @@ void GamecubeControllersWidget::CreateLayout()
     m_gc_layout->addWidget(gc_box, controller_row, 1);
     m_gc_layout->addWidget(gc_button, controller_row, 2);
   }
+
+  m_gcpad_ciface = new QCheckBox(tr("Use Wii-U Adapter for Emulated Controllers"));
+  m_gc_layout->addWidget(m_gcpad_ciface, m_gc_layout->rowCount(), 0, 1, -1);
+
   m_gc_box->setLayout(m_gc_layout);
 
   auto* layout = new QVBoxLayout;
@@ -114,6 +119,8 @@ void GamecubeControllersWidget::ConnectWidgets()
     });
     connect(m_gc_buttons[i], &QPushButton::clicked, this, [this, i] { OnGCPadConfigure(i); });
   }
+
+  connect(m_gcpad_ciface, &QCheckBox::toggled, this, &GamecubeControllersWidget::SaveSettings);
 }
 
 void GamecubeControllersWidget::OnGCTypeChanged(size_t index)
@@ -184,6 +191,9 @@ void GamecubeControllersWidget::LoadSettings(Core::State state)
       OnGCTypeChanged(i);
     }
   }
+
+  SignalBlocking(m_gcpad_ciface)
+      ->setChecked(Config::Get(Config::MAIN_USE_GC_ADAPTER_FOR_CONTROLLER_INTERFACE));
 }
 
 void GamecubeControllersWidget::SaveSettings()
@@ -203,11 +213,15 @@ void GamecubeControllersWidget::SaveSettings()
                                                                       static_cast<s32>(i));
       }
     }
+
+    Config::SetBaseOrCurrent(Config::MAIN_USE_GC_ADAPTER_FOR_CONTROLLER_INTERFACE,
+                             m_gcpad_ciface->isChecked());
   }
+
+  SConfig::GetInstance().SaveSettings();
+
   if (GCAdapter::UseAdapter())
     GCAdapter::StartScanThread();
   else
     GCAdapter::StopScanThread();
-
-  SConfig::GetInstance().SaveSettings();
 }

Source/Core/DolphinQt/Config/GamecubeControllersWidget.h

@@ -7,6 +7,7 @@
 
 #include <array>
 
+class QCheckBox;
 class QComboBox;
 class QHBoxLayout;
 class QGridLayout;
@@ -40,4 +41,5 @@ private:
   std::array<QComboBox*, 4> m_gc_controller_boxes;
   std::array<QPushButton*, 4> m_gc_buttons;
   std::array<QHBoxLayout*, 4> m_gc_groups;
+  QCheckBox* m_gcpad_ciface;
 };

Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp

@@ -87,6 +87,7 @@ void ControllerInterface::Initialize(const WindowSystemInfo& wsi)
   m_input_backends.emplace_back(ciface::SteamDeck::CreateInputBackend(this));
 #endif
 
+  // TODO: obey Config::Get(Config::MAIN_USE_GC_ADAPTER_FOR_CONTROLLER_INTERFACE)
   m_input_backends.emplace_back(ciface::WiiUAdapter::CreateInputBackend(this));
 
   // Don't allow backends to add devices before the first RefreshDevices() as they will be cleaned

Source/Core/InputCommon/GCAdapter.cpp

@@ -415,12 +415,14 @@ void SetAdapterCallback(std::function<void(void)> func)
 
 static void RefreshConfig()
 {
-  s_is_adapter_wanted = false;
+  s_is_adapter_wanted = Config::Get(Config::MAIN_USE_GC_ADAPTER_FOR_CONTROLLER_INTERFACE);
 
   for (int i = 0; i < SerialInterface::MAX_SI_CHANNELS; ++i)
   {
     s_is_adapter_wanted |= Config::Get(Config::GetInfoForSIDevice(i)) ==
                            SerialInterface::SIDevices::SIDEVICE_WIIU_ADAPTER;
+
+    // TODO: ControllerInterface shouldn't obey this setting.
     s_config_rumble_enabled[i] = Config::Get(Config::GetInfoForAdapterRumble(i));
   }
 }