HLE: Implement IHidServer IsSixAxisSensorAtRest

Fixes the actually insane amount of log spam in games that check for this, such as Luigi's Mansion 3.

Values in HidDevices.NpadDevices.isAtRest may need to be tuned to a better range for resting detection. I originally set them to 0, and my controller rests at definitely NOT 0.

Will need to be revisited when implementing functionality for the global SixAxisActive bool, IHidServer.StartSixAxisTracking, and IHidServer.StopSixAxisTracking.

src/Ryujinx.HLE/HOS/Services/Hid/HidDevices/NpadDevices.cs

@@ -56,6 +56,7 @@ namespace Ryujinx.HLE.HOS.Services.Hid
             _activeCount = 0;
 
             JoyHold = NpadJoyHoldType.Vertical;
+            SixAxisActive = false;
         }
 
         internal ref KEvent GetStyleSetUpdateEvent(PlayerIndex player)
@@ -580,6 +581,23 @@ namespace Ryujinx.HLE.HOS.Services.Hid
 
             return needUpdateRight;
         }
+        
+        public bool isAtRest(int playerNumber)
+        {
+            
+            ref NpadInternalState currentNpad = ref _device.Hid.SharedMemory.Npads[playerNumber].InternalState;
+            ref SixAxisSensorState storage = ref GetSixAxisSensorLifo(ref currentNpad, false).GetCurrentEntryRef();
+                
+            float acceleration = Math.Abs(storage.Acceleration.X)
+                                 + Math.Abs(storage.Acceleration.Y)
+                                 + Math.Abs(storage.Acceleration.Z);
+
+            float angularVelocity = Math.Abs(storage.AngularVelocity.X)
+                                    + Math.Abs(storage.AngularVelocity.Y)
+                                    + Math.Abs(storage.AngularVelocity.Z);
+
+            return ((acceleration <= 1.5F) && (angularVelocity <= 1.1F));
+        }
 
         private void UpdateDisconnectedInputSixAxis(PlayerIndex index)
         {

src/Ryujinx.HLE/HOS/Services/Hid/IHidServer.cs

@@ -602,19 +602,52 @@ namespace Ryujinx.HLE.HOS.Services.Hid
         }
 
         [CommandCmif(82)]
-        // IsSixAxisSensorAtRest(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> bool IsAsRest
+        // IsSixAxisSensorAtRest(nn::hid::SixAxisSensorHandle, nn::applet::AppletResourceUserId) -> bool IsAtRest
         public ResultCode IsSixAxisSensorAtRest(ServiceCtx context)
         {
             int sixAxisSensorHandle = context.RequestData.ReadInt32();
+            
+            // 4 byte struct w/ 4-byte alignment
+            // 0x0 	0x4 	TypeValue
+            // 0x0 	0x1 	NpadStyleIndex
+            // 0x1 	0x1 	PlayerNumber
+            // 0x2 	0x1 	DeviceIdx 
+            
+            // uint typeValue = (uint) sixAxisSensorHandle;
+            // uint npadStyleIndex = (uint) sixAxisSensorHandle & 0xff;
+            int playerNumber = (sixAxisSensorHandle << 8) & 0xff;
+            // uint deviceIdx= ((uint) sixAxisSensorHandle << 16) & 0xff;
+            // uint unknown = ((uint) sixAxisSensorHandle << 24) & 0xff;
+            
+            // 32bit sign extension padding
+            // if = 0, + offset, else - offset
+            // npadStyleIndex = ((npadStyleIndex & 0x8000) == 0) ? npadStyleIndex | 0xFFFF0000 : npadStyleIndex & 0xFFFF0000;
+            // playerNumber = ((playerNumber & 0x8000) == 0) ? playerNumber | 0xFFFF0000 : playerNumber & 0xFFFF0000;
+            // deviceIdx = ((deviceIdx & 0x8000) == 0) ? deviceIdx | 0xFFFF0000 : deviceIdx & 0xFFFF0000;
+            // unknown = ((unknown & 0x8000) == 0) ? unknown | 0xFFFF0000 : unknown & 0xFFFF0000;
+            
             context.RequestData.BaseStream.Position += 4; // Padding
             long appletResourceUserId = context.RequestData.ReadInt64();
 
-            bool isAtRest = true;
-
+            bool isAtRest;
+            
+            // TODO: link to context.Device.Hid.Npads.SixAxisActive when properly implemented
+            // We currently do not support stopping or starting SixAxisTracking.
+            // It is just always tracking, the bool is unused.
+            // See Ryujinx.HLE.HOS.Services.Hid.NpadDevices
+            
+            // common cases: if
+            //     controller is keyboard (keyboards don't have gyroscopes, silly goose!)
+            //     controller has no gyroscope
+            //     SixAxisActive == false
+            //     SixAxisTracking == false
+            // then isAtRest = true
+            // else check gyroscopic activity
+            
+            // check gyroscopic activity
+            isAtRest = context.Device.Hid.Npads.isAtRest(playerNumber);
+            
             context.ResponseData.Write(isAtRest);
-
-            Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle, isAtRest });
-
             return ResultCode.Success;
         }
 
@@ -629,7 +662,7 @@ namespace Ryujinx.HLE.HOS.Services.Hid
             context.ResponseData.Write(_isFirmwareUpdateAvailableForSixAxisSensor);
 
             Logger.Stub?.PrintStub(LogClass.ServiceHid, new { appletResourceUserId, sixAxisSensorHandle, _isFirmwareUpdateAvailableForSixAxisSensor });
-
+            
             return ResultCode.Success;
         }