From 0e33b19ae0292dd7b99241bc4e6fc8936bd89e5c Mon Sep 17 00:00:00 2001
From: Morph <39850852+Morph1984@users.noreply.github.com>
Date: Thu, 27 Aug 2020 13:27:03 -0400
Subject: hid: Implement MergeSingleJoyasDualJoy

- Used in multiple games such as Super Mario Odyssey.
---
 src/core/hle/service/hid/controllers/npad.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/core/hle/service/hid/controllers/npad.cpp')

diff --git a/src/core/hle/service/hid/controllers/npad.cpp b/src/core/hle/service/hid/controllers/npad.cpp
index 45fde8df2..e742497e1 100644
--- a/src/core/hle/service/hid/controllers/npad.cpp
+++ b/src/core/hle/service/hid/controllers/npad.cpp
@@ -574,6 +574,22 @@ Controller_NPad::GyroscopeZeroDriftMode Controller_NPad::GetGyroscopeZeroDriftMo
     return gyroscope_zero_drift_mode;
 }
 
+void Controller_NPad::MergeSingleJoyAsDualJoy(u32 npad_id_1, u32 npad_id_2) {
+    const auto npad_index_1 = NPadIdToIndex(npad_id_1);
+    const auto npad_index_2 = NPadIdToIndex(npad_id_2);
+
+    // If the controllers at both npad indices form a pair of left and right joycons, merge them.
+    // Otherwise, do nothing.
+    if ((connected_controllers[npad_index_1].type == NPadControllerType::JoyLeft &&
+         connected_controllers[npad_index_2].type == NPadControllerType::JoyRight) ||
+        (connected_controllers[npad_index_2].type == NPadControllerType::JoyLeft &&
+         connected_controllers[npad_index_1].type == NPadControllerType::JoyRight)) {
+        // Disconnect the joycon at the second id and connect the dual joycon at the first index.
+        DisconnectNPad(npad_id_2);
+        AddNewControllerAt(NPadControllerType::JoyDual, npad_index_1);
+    }
+}
+
 void Controller_NPad::StartLRAssignmentMode() {
     // Nothing internally is used for lr assignment mode. Since we have the ability to set the
     // controller types from boot, it doesn't really matter about showing a selection screen
-- 
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