Fixed ISXB-766, ISXB-808, ISXB-704, conditional to trunk PR #49932.

Packages/com.unity.inputsystem/InputSystem/Editor/Settings/InputSettingsProvider.cs

@@ -122,6 +122,10 @@ public override void OnGUI(string searchContext)
                 if (!runInBackground)
                     EditorGUILayout.HelpBox("Focus change behavior can only be changed if 'Run In Background' is enabled in Player Settings.", MessageType.Info);
 
+#if UNITY_6000_0_OR_NEWER
+                EditorGUILayout.PropertyField(m_ScrollDeltaBehavior, m_ScrollDeltaBehaviorContent);
+#endif
+
                 EditorGUILayout.Space();
                 EditorGUILayout.PropertyField(m_CompensateForScreenOrientation, m_CompensateForScreenOrientationContent);
 
@@ -266,6 +270,7 @@ private void InitializeWithCurrentSettings()
             // Look up properties.
             m_SettingsObject = new SerializedObject(m_Settings);
             m_UpdateMode = m_SettingsObject.FindProperty("m_UpdateMode");
+            m_ScrollDeltaBehavior = m_SettingsObject.FindProperty("m_ScrollDeltaBehavior");
             m_CompensateForScreenOrientation = m_SettingsObject.FindProperty("m_CompensateForScreenOrientation");
             m_BackgroundBehavior = m_SettingsObject.FindProperty("m_BackgroundBehavior");
             m_EditorInputBehaviorInPlayMode = m_SettingsObject.FindProperty("m_EditorInputBehaviorInPlayMode");
@@ -281,6 +286,9 @@ private void InitializeWithCurrentSettings()
             m_ShortcutKeysConsumeInputs = m_SettingsObject.FindProperty("m_ShortcutKeysConsumeInputs");
 
             m_UpdateModeContent = new GUIContent("Update Mode", "When should the Input System be updated?");
+#if UNITY_6000_0_OR_NEWER
+            m_ScrollDeltaBehaviorContent = new GUIContent("Scroll Delta Behavior", "What value range should be used for scroll wheel delta?");
+#endif
             m_CompensateForScreenOrientationContent = new GUIContent("Compensate Orientation", "Whether sensor input on mobile devices should be transformed to be relative to the current device orientation.");
             m_BackgroundBehaviorContent = new GUIContent("Background Behavior", "If runInBackground is true (and in standalone *development* players and the editor), "
                 + "determines what happens to InputDevices and events when the application moves in and out of running in the foreground.\n\n"
@@ -404,6 +412,7 @@ private static string[] FindInputSettingsInProject()
         [NonSerialized] private int m_SettingsDirtyCount;
         [NonSerialized] private SerializedObject m_SettingsObject;
         [NonSerialized] private SerializedProperty m_UpdateMode;
+        [NonSerialized] private SerializedProperty m_ScrollDeltaBehavior;
         [NonSerialized] private SerializedProperty m_CompensateForScreenOrientation;
         [NonSerialized] private SerializedProperty m_BackgroundBehavior;
         [NonSerialized] private SerializedProperty m_EditorInputBehaviorInPlayMode;
@@ -427,6 +436,9 @@ private static string[] FindInputSettingsInProject()
         [NonSerialized] private GUIStyle m_NewAssetButtonStyle;
 
         private GUIContent m_UpdateModeContent;
+#if UNITY_6000_0_OR_NEWER
+        private GUIContent m_ScrollDeltaBehaviorContent;
+#endif
         private GUIContent m_CompensateForScreenOrientationContent;
         private GUIContent m_BackgroundBehaviorContent;
         private GUIContent m_EditorInputBehaviorInPlayModeContent;

Packages/com.unity.inputsystem/InputSystem/IInputRuntime.cs

@@ -174,6 +174,8 @@ internal unsafe interface IInputRuntime
 
         Vector2 screenSize { get; }
         ScreenOrientation screenOrientation { get; }
+        bool allowPlatformSpecificInputForScrollWheelDelta { get; set; }
+        float scrollWheelDeltaPerTick { get; }
 
         // If analytics are enabled, the runtime receives analytics events from the input manager.
         // See InputAnalytics.

Packages/com.unity.inputsystem/InputSystem/InputManager.cs

@@ -159,6 +159,21 @@ public InputUpdateType defaultUpdateType
             }
         }
 
+        public InputSettings.ScrollDeltaBehavior scrollDeltaBehavior
+        {
+            get => m_ScrollDeltaBehavior;
+            set
+            {
+                if (m_ScrollDeltaBehavior == value)
+                    return;
+
+                m_ScrollDeltaBehavior = value;
+
+                InputRuntime.s_Instance.allowPlatformSpecificInputForScrollWheelDelta =
+                    m_ScrollDeltaBehavior == InputSettings.ScrollDeltaBehavior.KeepPlatformSpecificInputRange;
+            }
+        }
+
         public float pollingFrequency
         {
             get => m_PollingFrequency;
@@ -1851,6 +1866,8 @@ internal void InitializeData()
             m_UpdateMask |= InputUpdateType.Editor;
 #endif
 
+            m_ScrollDeltaBehavior = InputSettings.ScrollDeltaBehavior.UniformAcrossAllPlatforms;
+
             // Default polling frequency is 60 Hz.
             m_PollingFrequency = 60;
 
@@ -2067,6 +2084,8 @@ internal struct AvailableDevice
         private InputUpdateType m_CurrentUpdate;
         internal InputStateBuffers m_StateBuffers;
 
+        private InputSettings.ScrollDeltaBehavior m_ScrollDeltaBehavior;
+
         #if UNITY_EDITOR
         // remember time offset to correctly restore it after editor mode is done
         private double latestNonEditorTimeOffsetToRealtimeSinceStartup;
@@ -2596,6 +2615,8 @@ internal void ApplySettings()
             #endif
             updateMask = newUpdateMask;
 
+            scrollDeltaBehavior = m_Settings.scrollDeltaBehavior;
+
             ////TODO: optimize this so that we don't repeatedly recreate state if we add/remove multiple devices
             ////      (same goes for not resolving actions repeatedly)
 
@@ -3801,6 +3822,7 @@ internal struct SerializedState
             public InputStateBuffers buffers;
             public InputUpdate.SerializedState updateState;
             public InputUpdateType updateMask;
+            public InputSettings.ScrollDeltaBehavior scrollDeltaBehavior;
             public InputMetrics metrics;
             public InputSettings settings;
             public InputActionAsset actions;
@@ -3845,6 +3867,7 @@ internal SerializedState SaveState()
                 buffers = m_StateBuffers,
                 updateState = InputUpdate.Save(),
                 updateMask = m_UpdateMask,
+                scrollDeltaBehavior = m_ScrollDeltaBehavior,
                 metrics = m_Metrics,
                 settings = m_Settings,
                 #if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
@@ -3862,6 +3885,7 @@ internal void RestoreStateWithoutDevices(SerializedState state)
             m_StateBuffers = state.buffers;
             m_LayoutRegistrationVersion = state.layoutRegistrationVersion + 1;
             updateMask = state.updateMask;
+            scrollDeltaBehavior = state.scrollDeltaBehavior;
             m_Metrics = state.metrics;
             m_PollingFrequency = state.pollingFrequency;
 

Packages/com.unity.inputsystem/InputSystem/InputSettings.cs

@@ -84,6 +84,23 @@ public UpdateMode updateMode
             }
         }
 
+        /// <summary>
+        /// Controls how platform-specific input should be converted when returning delta values for scroll wheel input actions.
+        /// By default, the range used for the delta is converted to be uniform across all platforms.
+        /// </summary>
+        /// <value>The conversion behavior.</value>
+        public ScrollDeltaBehavior scrollDeltaBehavior
+        {
+            get => m_ScrollDeltaBehavior;
+            set
+            {
+                if (m_ScrollDeltaBehavior == value)
+                    return;
+                m_ScrollDeltaBehavior = value;
+                OnChange();
+            }
+        }
+
         /// <summary>
         /// If true, sensors that deliver rotation values on handheld devices will automatically adjust
         /// rotations when the screen orientation changes.
@@ -748,6 +765,7 @@ public void SetInternalFeatureFlag(string featureName, bool enabled)
         [Tooltip("Determine when Unity processes events. By default, accumulated input events are flushed out before each fixed update and "
             + "before each dynamic update. This setting can be used to restrict event processing to only where the application needs it.")]
         [SerializeField] private UpdateMode m_UpdateMode = UpdateMode.ProcessEventsInDynamicUpdate;
+        [SerializeField] private ScrollDeltaBehavior m_ScrollDeltaBehavior = ScrollDeltaBehavior.UniformAcrossAllPlatforms;
         [SerializeField] private int m_MaxEventBytesPerUpdate = 5 * 1024 * 1024;
         [SerializeField] private int m_MaxQueuedEventsPerUpdate = 1000;
 
@@ -845,6 +863,29 @@ public enum UpdateMode
             ProcessEventsManually,
         }
 
+        /// <summary>
+        /// How platform-specific input should be converted when returning delta values for scroll wheel input actions.
+        /// </summary>
+        public enum ScrollDeltaBehavior
+        {
+            /// <summary>
+            /// The range used for the delta is converted to be uniform across all platforms.
+            /// </summary>
+            /// <remarks>
+            /// The resulting range will be [-1, 1] regardless of the platform used.
+            /// </remarks>
+            UniformAcrossAllPlatforms = 0,
+
+            /// <summary>
+            /// The range used for the delta is the same as returned by the platform input.
+            /// </summary>
+            /// <remarks>
+            /// The range will typically be [-120, 120] on Windows and [-1, 1] on MacOS and Linux.
+            /// Other platforms may have different ranges.
+            /// </remarks>
+            KeepPlatformSpecificInputRange = 1
+        }
+
         /// <summary>
         /// Determines how the applications behaves when running in the background. See <see cref="backgroundBehavior"/>.
         /// </summary>

Packages/com.unity.inputsystem/InputSystem/InputSystem.cs

@@ -3423,6 +3423,8 @@ public static bool runInBackground
             set => s_Manager.m_Runtime.runInBackground = value;
         }
 
+        internal static float scrollWheelDeltaPerTick => InputRuntime.s_Instance.scrollWheelDeltaPerTick;
+
         ////REVIEW: restrict metrics to editor and development builds?
         /// <summary>
         /// Get various up-to-date metrics about the input system.

Packages/com.unity.inputsystem/InputSystem/NativeInputRuntime.cs

@@ -281,6 +281,25 @@ private void OnFocusChanged(bool focus)
         public Vector2 screenSize => new Vector2(Screen.width, Screen.height);
         public ScreenOrientation screenOrientation => Screen.orientation;
 
+        public bool allowPlatformSpecificInputForScrollWheelDelta
+        {
+#if UNITY_6000_0_OR_NEWER
+            get => NativeInputSystem.allowPlatformSpecificInputForScrollWheelDelta;
+            set => NativeInputSystem.allowPlatformSpecificInputForScrollWheelDelta = value;
+#else
+            get; set;
+#endif
+        }
+
+        public float scrollWheelDeltaPerTick
+        {
+#if UNITY_6000_0_OR_NEWER
+            get { return NativeInputSystem.GetScrollWheelDeltaPerTick(); }
+#else
+            get => 1.0f;
+#endif
+        }
+
         public bool isInBatchMode => Application.isBatchMode;
 
         #if UNITY_EDITOR

Packages/com.unity.inputsystem/InputSystem/Plugins/InputForUI/InputSystemProvider.cs

@@ -45,7 +45,11 @@ internal class InputSystemProvider : IEventProviderImpl
         NavigationEventRepeatHelper m_RepeatHelper = new();
         bool m_ResetSeenEventsOnUpdate;
 
+#if UNITY_6000_0_OR_NEWER
+        const float kScrollUGUIScaleFactor = UIElements.WheelEvent.scrollDeltaPerTick;
+#else
         const float kScrollUGUIScaleFactor = 3.0f;
+#endif
 
         static Action<InputActionAsset> s_OnRegisterActions;
 
@@ -529,8 +533,9 @@ void OnClickPerformed(InputAction.CallbackContext ctx, EventSource eventSource,
 
         void OnScrollWheelPerformed(InputAction.CallbackContext ctx)
         {
-            var scrollDelta = ctx.ReadValue<Vector2>();
-            if (scrollDelta.sqrMagnitude < k_SmallestReportedMovementSqrDist)
+            // ISXB-704: convert potentially platform-specific input value to uniform ticks before sending them to UI.
+            var scrollTicks = ctx.ReadValue<Vector2>() / InputSystem.scrollWheelDeltaPerTick;
+            if (scrollTicks.sqrMagnitude < k_SmallestReportedMovementSqrDist)
                 return;
 
             var eventSource = GetEventSource(ctx);
@@ -550,9 +555,12 @@ void OnScrollWheelPerformed(InputAction.CallbackContext ctx)
                 targetDisplay = Mouse.current.displayIndex.ReadValue();
             }
 
-            // Make it look similar to IMGUI event scroll values.
-            scrollDelta.x *= kScrollUGUIScaleFactor;
-            scrollDelta.y *= -kScrollUGUIScaleFactor;
+            // Make scrollDelta look similar to IMGUI event scroll values.
+            var scrollDelta = new Vector2
+            {
+                x = scrollTicks.x * kScrollUGUIScaleFactor,
+                y = -scrollTicks.y * kScrollUGUIScaleFactor
+            };
 
             DispatchFromCallback(Event.From(new PointerEvent
             {

Packages/com.unity.inputsystem/InputSystem/Plugins/UI/InputSystemUIInputModule.cs

@@ -2062,18 +2062,19 @@ private bool CheckForRemovedDevice(ref InputAction.CallbackContext context)
             return false;
         }
 
-        internal const float kPixelPerLine = 20;
-
         private void OnScrollCallback(InputAction.CallbackContext context)
         {
             var index = GetPointerStateIndexFor(ref context);
             if (index == -1)
                 return;
 
             ref var state = ref GetPointerStateForIndex(index);
-            // The old input system reported scroll deltas in lines, we report pixels.
-            // Need to scale as the UI system expects lines.
-            state.scrollDelta = context.ReadValue<Vector2>() * (1 / kPixelPerLine);
+
+            var scrollDelta = context.ReadValue<Vector2>();
+
+            // ISXB-704: convert potentially platform-specific input value to BaseInputModule convention.
+            state.scrollDelta = scrollDelta * (scrollWheelDeltaPerTick / InputSystem.scrollWheelDeltaPerTick);
+
 #if UNITY_2022_3_OR_NEWER
             state.eventData.displayIndex = GetDisplayIndexFor(context.control);
 #endif

Packages/com.unity.inputsystem/Tests/TestFixture/InputTestRuntime.cs

@@ -371,6 +371,8 @@ public struct PairedUser
 
         public Vector2 screenSize { get; set; } = new Vector2(1024, 768);
         public ScreenOrientation screenOrientation { set; get; } = ScreenOrientation.Portrait;
+        public bool allowPlatformSpecificInputForScrollWheelDelta { get; set; }
+        public float scrollWheelDeltaPerTick { get; } = 1.0f;
 
         public List<PairedUser> userAccountPairings
         {