test

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Devices/Precompiled/FastKeyboard.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Devices/Precompiled/FastMouse.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Devices/Precompiled/FastMouse.partial.cs

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+using UnityEngine.InputSystem.LowLevel;
+
+namespace UnityEngine.InputSystem
+{
+    internal partial class FastMouse : IInputStateCallbackReceiver, IEventMerger
+    {
+        protected new void OnNextUpdate()
+        {
+            // Changing these separately seems to not result in much of a difference
+            // compared to just doing an InputState.Change with a complete MouseState.
+            InputState.Change(delta, Vector2.zero, InputState.currentUpdateType);
+            InputState.Change(scroll, Vector2.zero, InputState.currentUpdateType);
+        }
+
+        // For FastMouse, we know that our layout is MouseState so we can just go directly
+        // to memory.
+
+        protected new unsafe void OnStateEvent(InputEventPtr eventPtr)
+        {
+            if (eventPtr.type != StateEvent.Type)
+            {
+                base.OnStateEvent(eventPtr);
+                return;
+            }
+
+            var stateEvent = StateEvent.FromUnchecked(eventPtr);
+            if (stateEvent->stateFormat != MouseState.Format)
+            {
+                base.OnStateEvent(eventPtr);
+                return;
+            }
+
+            var newState = *(MouseState*)stateEvent->state;
+            var stateFromDevice = (MouseState*)((byte*)currentStatePtr + m_StateBlock.byteOffset);
+
+            newState.delta += stateFromDevice->delta;
+            newState.scroll += stateFromDevice->scroll;
+
+            InputState.Change(this, ref newState, InputState.currentUpdateType, eventPtr: eventPtr);
+        }
+
+        void IInputStateCallbackReceiver.OnNextUpdate()
+        {
+            OnNextUpdate();
+        }
+
+        void IInputStateCallbackReceiver.OnStateEvent(InputEventPtr eventPtr)
+        {
+            OnStateEvent(eventPtr);
+        }
+
+        internal static unsafe bool MergeForward(InputEventPtr currentEventPtr, InputEventPtr nextEventPtr)
+        {
+            if (currentEventPtr.type != StateEvent.Type || nextEventPtr.type != StateEvent.Type)
+                return false;
+
+            var currentEvent = StateEvent.FromUnchecked(currentEventPtr);
+            var nextEvent = StateEvent.FromUnchecked(nextEventPtr);
+
+            if (currentEvent->stateFormat != MouseState.Format || nextEvent->stateFormat != MouseState.Format)
+                return false;
+
+            var currentState = (MouseState*)currentEvent->state;
+            var nextState = (MouseState*)nextEvent->state;
+
+            // if buttons or clickCount changed we need to process it, so don't merge events together
+            if (currentState->buttons != nextState->buttons || currentState->clickCount != nextState->clickCount)
+                return false;
+
+            nextState->delta += currentState->delta;
+            nextState->scroll += currentState->scroll;
+            return true;
+        }
+
+        bool IEventMerger.MergeForward(InputEventPtr currentEventPtr, InputEventPtr nextEventPtr)
+        {
+            return MergeForward(currentEventPtr, nextEventPtr);
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Devices/Precompiled/FastMouse.partial.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Devices/Precompiled/FastTouchscreen.cs.meta

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