applets/controller: Implement fallback applet for the SDL frontend

Implement the fallback applet for the SDL frontend, connecting only the minimum amount of players required.

src/core/frontend/applets/controller.cpp

@@ -27,11 +27,44 @@ void DefaultControllerApplet::ReconfigureControllers(std::function<void()> callb
 
     auto& players = Settings::values.players;
 
+    const auto min_supported_players = parameters.enable_single_mode ? 1 : parameters.min_players;
+
+    // Disconnect Handheld first.
+    npad.DisconnectNPadAtIndex(8);
+
     // Deduce the best configuration based on the input parameters.
-    for (std::size_t index = 0; index < players.size(); ++index) {
+    for (std::size_t index = 0; index < players.size() - 2; ++index) {
         // First, disconnect all controllers regardless of the value of keep_controllers_connected.
         // This makes it easy to connect the desired controllers.
         npad.DisconnectNPadAtIndex(index);
+
+        // Only connect the minimum number of required players.
+        if (index >= min_supported_players) {
+            continue;
+        }
+
+        // Connect controllers based on the following priority list from highest to lowest priority:
+        // Pro Controller -> Dual Joycons -> Left Joycon -> Right Joycon -> Handheld
+        if (parameters.allow_pro_controller) {
+            npad.AddNewControllerAt(
+                npad.MapSettingsTypeToNPad(Settings::ControllerType::ProController), index);
+        } else if (parameters.allow_dual_joycons) {
+            npad.AddNewControllerAt(
+                npad.MapSettingsTypeToNPad(Settings::ControllerType::DualJoyconDetached), index);
+        } else if (parameters.allow_left_joycon) {
+            npad.AddNewControllerAt(
+                npad.MapSettingsTypeToNPad(Settings::ControllerType::LeftJoycon), index);
+        } else if (parameters.allow_right_joycon) {
+            npad.AddNewControllerAt(
+                npad.MapSettingsTypeToNPad(Settings::ControllerType::RightJoycon), index);
+        } else if (index == 0 && parameters.enable_single_mode && parameters.allow_handheld &&
+                   !Settings::values.use_docked_mode) {
+            // We should *never* reach here under any normal circumstances.
+            npad.AddNewControllerAt(npad.MapSettingsTypeToNPad(Settings::ControllerType::Handheld),
+                                    index);
+        } else {
+            UNREACHABLE_MSG("Unable to add a new controller based on the given parameters!");
+        }
     }
 
     callback();

src/core/hle/service/hid/controllers/npad.cpp

@@ -720,92 +720,4 @@ bool Controller_NPad::IsControllerSupported(NPadControllerType controller) const
     return false;
 }
 
-Controller_NPad::NPadControllerType Controller_NPad::DecideBestController(
-    NPadControllerType priority) const {
-    if (IsControllerSupported(priority)) {
-        return priority;
-    }
-    const auto is_docked = Settings::values.use_docked_mode;
-    if (is_docked && priority == NPadControllerType::Handheld) {
-        priority = NPadControllerType::JoyDual;
-        if (IsControllerSupported(priority)) {
-            return priority;
-        }
-    }
-    std::vector<NPadControllerType> priority_list;
-    switch (priority) {
-    case NPadControllerType::ProController:
-        priority_list.push_back(NPadControllerType::JoyDual);
-        if (!is_docked) {
-            priority_list.push_back(NPadControllerType::Handheld);
-        }
-        priority_list.push_back(NPadControllerType::JoyLeft);
-        priority_list.push_back(NPadControllerType::JoyRight);
-        priority_list.push_back(NPadControllerType::Pokeball);
-        break;
-    case NPadControllerType::Handheld:
-        priority_list.push_back(NPadControllerType::JoyDual);
-        priority_list.push_back(NPadControllerType::ProController);
-        priority_list.push_back(NPadControllerType::JoyLeft);
-        priority_list.push_back(NPadControllerType::JoyRight);
-        priority_list.push_back(NPadControllerType::Pokeball);
-        break;
-    case NPadControllerType::JoyDual:
-        if (!is_docked) {
-            priority_list.push_back(NPadControllerType::Handheld);
-        }
-        priority_list.push_back(NPadControllerType::ProController);
-        priority_list.push_back(NPadControllerType::JoyLeft);
-        priority_list.push_back(NPadControllerType::JoyRight);
-        priority_list.push_back(NPadControllerType::Pokeball);
-        break;
-    case NPadControllerType::JoyLeft:
-        priority_list.push_back(NPadControllerType::JoyRight);
-        priority_list.push_back(NPadControllerType::JoyDual);
-        if (!is_docked) {
-            priority_list.push_back(NPadControllerType::Handheld);
-        }
-        priority_list.push_back(NPadControllerType::ProController);
-        priority_list.push_back(NPadControllerType::Pokeball);
-        break;
-    case NPadControllerType::JoyRight:
-        priority_list.push_back(NPadControllerType::JoyLeft);
-        priority_list.push_back(NPadControllerType::JoyDual);
-        if (!is_docked) {
-            priority_list.push_back(NPadControllerType::Handheld);
-        }
-        priority_list.push_back(NPadControllerType::ProController);
-        priority_list.push_back(NPadControllerType::Pokeball);
-        break;
-    case NPadControllerType::Pokeball:
-        priority_list.push_back(NPadControllerType::JoyLeft);
-        priority_list.push_back(NPadControllerType::JoyRight);
-        priority_list.push_back(NPadControllerType::JoyDual);
-        if (!is_docked) {
-            priority_list.push_back(NPadControllerType::Handheld);
-        }
-        priority_list.push_back(NPadControllerType::ProController);
-        break;
-    default:
-        priority_list.push_back(NPadControllerType::JoyDual);
-        if (!is_docked) {
-            priority_list.push_back(NPadControllerType::Handheld);
-        }
-        priority_list.push_back(NPadControllerType::ProController);
-        priority_list.push_back(NPadControllerType::JoyLeft);
-        priority_list.push_back(NPadControllerType::JoyRight);
-        priority_list.push_back(NPadControllerType::JoyDual);
-        break;
-    }
-
-    const auto iter = std::find_if(priority_list.begin(), priority_list.end(),
-                                   [this](auto type) { return IsControllerSupported(type); });
-    if (iter == priority_list.end()) {
-        UNIMPLEMENTED_MSG("Could not find supported controller!");
-        return priority;
-    }
-
-    return *iter;
-}
-
 } // namespace Service::HID

src/core/hle/service/hid/controllers/npad.h

@@ -318,7 +318,6 @@ private:
 
     void InitNewlyAddedController(std::size_t controller_idx);
     bool IsControllerSupported(NPadControllerType controller) const;
-    NPadControllerType DecideBestController(NPadControllerType priority) const;
     void RequestPadStateUpdate(u32 npad_id);
 
     u32 press_state{};