test

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/AxisComposite.cs

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+using System.ComponentModel;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Processors;
+using UnityEngine.InputSystem.Utilities;
+
+#if UNITY_EDITOR
+using System;
+using UnityEditor;
+using UnityEngine.InputSystem.Editor;
+using UnityEngine.UIElements;
+#endif
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A single axis value computed from one axis that pulls in the <see cref="negative"/> direction (<see cref="minValue"/>) and one
+    /// axis that pulls in the <see cref="positive"/> direction (<see cref="maxValue"/>).
+    /// </summary>
+    /// <remarks>
+    /// The limits of the axis are determined by <see cref="minValue"/> and <see cref="maxValue"/>.
+    /// By default, they are set to <c>[-1..1]</c>. The values can be set as parameters.
+    ///
+    /// <example>
+    /// <code>
+    /// var action = new InputAction();
+    /// action.AddCompositeBinding("Axis(minValue=0,maxValue=2)")
+    ///     .With("Negative", "&lt;Keyboard&gt;/a")
+    ///     .With("Positive", "&lt;Keyboard&gt;/d");
+    /// </code>
+    /// </example>
+    ///
+    /// If both axes are actuated at the same time, the behavior depends on <see cref="whichSideWins"/>.
+    /// By default, neither side will win (<see cref="WhichSideWins.Neither"/>) and the result
+    /// will be 0 (or, more precisely, the midpoint between <see cref="minValue"/> and <see cref="maxValue"/>).
+    /// This can be customized to make the positive side win (<see cref="WhichSideWins.Positive"/>)
+    /// or the negative one (<see cref="WhichSideWins.Negative"/>).
+    ///
+    /// This is useful, for example, in a driving game where break should cancel out accelerate.
+    /// By binding <see cref="negative"/> to the break control(s) and <see cref="positive"/> to the
+    /// acceleration control(s), and setting <see cref="whichSideWins"/> to <see cref="WhichSideWins.Negative"/>,
+    /// if the break button is pressed, it will always cause the acceleration button to be ignored.
+    ///
+    /// The actual <em>absolute</em> values of <see cref="negative"/> and <see cref="positive"/> are used
+    /// to scale <see cref="minValue"/> and <see cref="maxValue"/> respectively. So if, for example, <see cref="positive"/>
+    /// is bound to <see cref="Gamepad.rightTrigger"/> and the trigger is at a value of 0.5, then the resulting
+    /// value is <c>maxValue * 0.5</c> (the actual formula is <c>midPoint + (maxValue - midPoint) * positive</c>).
+    /// </remarks>
+    [DisplayStringFormat("{negative}/{positive}")]
+    [DisplayName("Positive/Negative Binding")]
+    public class AxisComposite : InputBindingComposite<float>
+    {
+        /// <summary>
+        /// Binding for the axis input that controls the negative [<see cref="minValue"/>..0] direction of the
+        /// combined axis.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int negative = 0;
+
+        /// <summary>
+        /// Binding for the axis input that controls the positive [0..<see cref="maxValue"/>] direction of the
+        /// combined axis.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int positive = 0;
+
+        /// <summary>
+        /// The lower bound that the axis is limited to. -1 by default.
+        /// </summary>
+        /// <remarks>
+        /// This value corresponds to the full actuation of the control(s) bound to <see cref="negative"/>.
+        ///
+        /// <example>
+        /// <code>
+        /// var action = new InputAction();
+        /// action.AddCompositeBinding("Axis(minValue=0,maxValue=2)")
+        ///     .With("Negative", "&lt;Keyboard&gt;/a")
+        ///     .With("Positive", "&lt;Keyboard&gt;/d");
+        /// </code>
+        /// </example>
+        /// </remarks>
+        /// <seealso cref="maxValue"/>
+        /// <seealso cref="negative"/>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [Tooltip("Value to return when the negative side is fully actuated.")]
+        public float minValue = -1;
+
+        /// <summary>
+        /// The upper bound that the axis is limited to. 1 by default.
+        /// </summary>
+        /// <remarks>
+        /// This value corresponds to the full actuation of the control(s) bound to <see cref="positive"/>.
+        ///
+        /// <example>
+        /// <code>
+        /// var action = new InputAction();
+        /// action.AddCompositeBinding("Axis(minValue=0,maxValue=2)")
+        ///     .With("Negative", "&lt;Keyboard&gt;/a")
+        ///     .With("Positive", "&lt;Keyboard&gt;/d");
+        /// </code>
+        /// </example>
+        /// </remarks>
+        /// <seealso cref="minValue"/>
+        /// <seealso cref="positive"/>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [Tooltip("Value to return when the positive side is fully actuated.")]
+        public float maxValue = 1;
+
+        /// <summary>
+        /// If both the <see cref="positive"/> and <see cref="negative"/> button are actuated, this
+        /// determines which value is returned from the composite.
+        /// </summary>
+        [Tooltip("If both the positive and negative side are actuated, decides what value to return. 'Neither' (default) means that " +
+            "the resulting value is the midpoint between min and max. 'Positive' means that max will be returned. 'Negative' means that " +
+            "min will be returned.")]
+        public WhichSideWins whichSideWins = WhichSideWins.Neither;
+
+        /// <summary>
+        /// The value that is returned if the composite is in a neutral position, that is, if
+        /// neither <see cref="positive"/> nor <see cref="negative"/> are actuated or if
+        /// <see cref="whichSideWins"/> is set to <see cref="WhichSideWins.Neither"/> and
+        /// both <see cref="positive"/> and <see cref="negative"/> are actuated.
+        /// </summary>
+        public float midPoint => (maxValue + minValue) / 2;
+
+        ////TODO: add parameters to control ramp up&down
+
+        /// <inheritdoc />
+        public override float ReadValue(ref InputBindingCompositeContext context)
+        {
+            var negativeValue = Mathf.Abs(context.ReadValue<float>(negative));
+            var positiveValue = Mathf.Abs(context.ReadValue<float>(positive));
+
+            var negativeIsActuated = negativeValue > Mathf.Epsilon;
+            var positiveIsActuated = positiveValue > Mathf.Epsilon;
+
+            if (negativeIsActuated == positiveIsActuated)
+            {
+                switch (whichSideWins)
+                {
+                    case WhichSideWins.Negative:
+                        positiveIsActuated = false;
+                        break;
+
+                    case WhichSideWins.Positive:
+                        negativeIsActuated = false;
+                        break;
+
+                    case WhichSideWins.Neither:
+                        return midPoint;
+                }
+            }
+
+            var mid = midPoint;
+
+            if (negativeIsActuated)
+                return mid - (mid - minValue) * negativeValue;
+
+            return mid + (maxValue - mid) * positiveValue;
+        }
+
+        /// <inheritdoc />
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            var value = ReadValue(ref context);
+            if (value < midPoint)
+            {
+                value = Mathf.Abs(value - midPoint);
+                return NormalizeProcessor.Normalize(value, 0, Mathf.Abs(minValue), 0);
+            }
+
+            value = Mathf.Abs(value - midPoint);
+            return NormalizeProcessor.Normalize(value, 0, Mathf.Abs(maxValue), 0);
+        }
+
+        /// <summary>
+        /// What happens to the value of an <see cref="AxisComposite"/> if both <see cref="positive"/>
+        /// and <see cref="negative"/> are actuated at the same time.
+        /// </summary>
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1717:OnlyFlagsEnumsShouldHavePluralNames", Justification = "False positive: `Wins` is not a plural form.")]
+        public enum WhichSideWins
+        {
+            /// <summary>
+            /// If both <see cref="positive"/> and <see cref="negative"/> are actuated, the sides cancel
+            /// each other out and the result is 0.
+            /// </summary>
+            Neither = 0,
+
+            /// <summary>
+            /// If both <see cref="positive"/> and <see cref="negative"/> are actuated, the value of
+            /// <see cref="positive"/> wins and <see cref="negative"/> is ignored.
+            /// </summary>
+            Positive = 1,
+
+            /// <summary>
+            /// If both <see cref="positive"/> and <see cref="negative"/> are actuated, the value of
+            /// <see cref="negative"/> wins and <see cref="positive"/> is ignored.
+            /// </summary>
+            Negative = 2,
+        }
+    }
+
+    #if UNITY_EDITOR
+    internal class AxisCompositeEditor : InputParameterEditor<AxisComposite>
+    {
+        private GUIContent m_WhichAxisWinsLabel = new GUIContent("Which Side Wins",
+            "Determine which axis 'wins' if both are actuated at the same time. "
+            + "If 'Neither' is selected, the result is 0 (or, more precisely, "
+            + "the midpoint between minValue and maxValue).");
+
+        public override void OnGUI()
+        {
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+#endif
+            target.whichSideWins = (AxisComposite.WhichSideWins)EditorGUILayout.EnumPopup(m_WhichAxisWinsLabel, target.whichSideWins);
+        }
+
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+        public override void OnDrawVisualElements(VisualElement root, Action onChangedCallback)
+        {
+            var modeField = new EnumField(m_WhichAxisWinsLabel.text, target.whichSideWins)
+            {
+                tooltip = m_WhichAxisWinsLabel.tooltip
+            };
+
+            modeField.RegisterValueChangedCallback(evt =>
+            {
+                target.whichSideWins = (AxisComposite.WhichSideWins)evt.newValue;
+                onChangedCallback();
+            });
+
+            root.Add(modeField);
+        }
+
+#endif
+    }
+    #endif
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/AxisComposite.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/ButtonWithOneModifier.cs

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+using System.ComponentModel;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+using UnityEngine.Scripting;
+
+////TODO: remove this once we can break the API
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A button with an additional modifier. The button only triggers when
+    /// the modifier is pressed.
+    /// </summary>
+    /// <remarks>
+    /// This composite can be used to require another button to be held while
+    /// pressing the button that triggers the action. This is most commonly used
+    /// on keyboards to require one of the modifier keys (shift, ctrl, or alt)
+    /// to be held in combination with another key, e.g. "CTRL+1".
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a button action that triggers when CTRL+1
+    /// // is pressed on the keyboard.
+    /// var action = new InputAction(type: InputActionType.Button);
+    /// action.AddCompositeBinding("ButtonWithOneModifier")
+    ///     .With("Modifier", "&lt;Keyboard&gt;/leftCtrl")
+    ///     .With("Modifier", "&lt;Keyboard&gt;/rightControl")
+    ///     .With("Button", "&lt;Keyboard&gt;/1")
+    /// </code>
+    /// </example>
+    ///
+    /// Note that this is not restricted to the keyboard and will preserve
+    /// the full value of the button.
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a button action that requires the A button on the
+    /// // gamepad to be held and will then trigger from the gamepad's
+    /// // left trigger button.
+    /// var action = new InputAction(type: InputActionType.Button);
+    /// action.AddCompositeBinding("ButtonWithOneModifier")
+    ///     .With("Modifier", "&lt;Gamepad&gt;/buttonSouth")
+    ///     .With("Button", "&lt;Gamepad&gt;/leftTrigger");
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="ButtonWithTwoModifiers"/>
+    [DesignTimeVisible(false)] // Obsoleted by OneModifierComposite
+    [DisplayStringFormat("{modifier}+{button}")]
+    public class ButtonWithOneModifier : InputBindingComposite<float>
+    {
+        /// <summary>
+        /// Binding for the button that acts as a modifier, e.g. <c>&lt;Keyboard/leftCtrl</c>.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int modifier;
+
+        /// <summary>
+        /// Binding for the button that is gated by the modifier. The composite will assume the value
+        /// of this button while the modifier is pressed.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int button;
+
+        /// <summary>
+        /// If set to <c>true</c>, <see cref="modifier"/> can be pressed after <see cref="button"/> and the composite will
+        /// still trigger. Default is false.
+        /// </summary>
+        /// <remarks>
+        /// By default, <see cref="modifier"/> is required to be in pressed state before or at the same time that <see cref="button"/>
+        /// goes into pressed state for the composite as a whole to trigger. This means that binding to, for example, <c>Shift+B</c>,
+        /// the <c>shift</c> key has to be pressed before pressing the <c>B</c> key. This is the behavior usually expected with
+        /// keyboard shortcuts.
+        ///
+        /// This parameter can be used to bypass this behavior and allow any timing between <see cref="modifier"/> and <see cref="button"/>.
+        /// The only requirement is for them both to concurrently be in pressed state.
+        /// </remarks>
+        public bool overrideModifiersNeedToBePressedFirst;
+
+        /// <summary>
+        /// Return the value of the <see cref="button"/> part if <see cref="modifier"/> is pressed. Otherwise
+        /// return 0.
+        /// </summary>
+        /// <param name="context">Evaluation context passed in from the input system.</param>
+        /// <returns>The current value of the composite.</returns>
+        public override float ReadValue(ref InputBindingCompositeContext context)
+        {
+            if (ModifierIsPressed(ref context))
+                return context.ReadValue<float>(button);
+
+            return default;
+        }
+
+        private bool ModifierIsPressed(ref InputBindingCompositeContext context)
+        {
+            var modifierDown = context.ReadValueAsButton(modifier);
+
+            if (modifierDown && !overrideModifiersNeedToBePressedFirst)
+            {
+                var timestamp = context.GetPressTime(button);
+                var timestamp1 = context.GetPressTime(modifier);
+
+                return timestamp1 <= timestamp;
+            }
+
+            return modifierDown;
+        }
+
+        /// <summary>
+        /// Same as <see cref="ReadValue"/> in this case.
+        /// </summary>
+        /// <param name="context">Evaluation context passed in from the input system.</param>
+        /// <returns>A >0 value if the composite is currently actuated.</returns>
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            return ReadValue(ref context);
+        }
+
+        protected override void FinishSetup(ref InputBindingCompositeContext context)
+        {
+            if (!overrideModifiersNeedToBePressedFirst)
+                overrideModifiersNeedToBePressedFirst = !InputSystem.settings.shortcutKeysConsumeInput;
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/ButtonWithOneModifier.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/ButtonWithTwoModifiers.cs

@@ -0,0 +1,153 @@
+using System.ComponentModel;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+using UnityEngine.Scripting;
+
+////TODO: remove this once we can break the API
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A button with two additional modifiers. The button only triggers when
+    /// both modifiers are pressed.
+    /// </summary>
+    /// <remarks>
+    /// This composite can be used to require two other buttons to be held while
+    /// using the control that triggers the action. This is most commonly used
+    /// on keyboards to require two of the modifier keys (shift, ctrl, or alt)
+    /// to be held in combination with another key, e.g. "CTRL+SHIFT+1".
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a button action that triggers when CTRL+SHIFT+1
+    /// // is pressed on the keyboard.
+    /// var action = new InputAction(type: InputActionType.Button);
+    /// action.AddCompositeBinding("TwoModifiers")
+    ///     .With("Modifier1", "&lt;Keyboard&gt;/leftCtrl")
+    ///     .With("Modifier1", "&lt;Keyboard&gt;/rightCtrl")
+    ///     .With("Modifier2", "&lt;Keyboard&gt;/leftShift")
+    ///     .With("Modifier2", "&lt;Keyboard&gt;/rightShift")
+    ///     .With("Button", "&lt;Keyboard&gt;/1")
+    /// </code>
+    /// </example>
+    ///
+    /// Note that this is not restricted to the keyboard and will preserve
+    /// the full value of the button.
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a button action that requires the A and X button on the
+    /// // gamepad to be held and will then trigger from the gamepad's
+    /// // left trigger button.
+    /// var action = new InputAction(type: InputActionType.Button);
+    /// action.AddCompositeBinding("ButtonWithTwoModifiers")
+    ///     .With("Modifier1", "&lt;Gamepad&gt;/buttonSouth")
+    ///     .With("Modifier2", "&lt;Gamepad&gt;/buttonWest")
+    ///     .With("Button", "&lt;Gamepad&gt;/leftTrigger");
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="ButtonWithOneModifier"/>
+    [DesignTimeVisible(false)] // Obsoleted by TwoModifiersComposite
+    [DisplayStringFormat("{modifier1}+{modifier2}+{button}")]
+    public class ButtonWithTwoModifiers : InputBindingComposite<float>
+    {
+        /// <summary>
+        /// Binding for the first button that acts as a modifier, e.g. <c>&lt;Keyboard/leftCtrl</c>.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int modifier1;
+
+        /// <summary>
+        /// Binding for the second button that acts as a modifier, e.g. <c>&lt;Keyboard/leftCtrl</c>.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int modifier2;
+
+        /// <summary>
+        /// Binding for the button that is gated by <see cref="modifier1"/> and <see cref="modifier2"/>.
+        /// The composite will assume the value of this button while both of the modifiers are pressed.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int button;
+
+        /// <summary>
+        /// If set to <c>true</c>, <see cref="modifier1"/> and/or <see cref="modifier2"/> can be pressed after <see cref="button"/>
+        /// and the composite will still trigger. Default is false.
+        /// </summary>
+        /// <remarks>
+        /// By default, <see cref="modifier1"/> and <see cref="modifier2"/> are required to be in pressed state before or at the same
+        /// time that <see cref="button"/> goes into pressed state for the composite as a whole to trigger. This means that binding to,
+        /// for example, <c>Ctrl+Shift+B</c>, the <c>ctrl</c> <c>shift</c> keys have to be pressed before pressing the <c>B</c> key.
+        /// This is the behavior usually expected with keyboard shortcuts.
+        ///
+        /// This parameter can be used to bypass this behavior and allow any timing between <see cref="modifier1"/>, <see cref="modifier2"/>,
+        /// and <see cref="button"/>. The only requirement is for all of them to concurrently be in pressed state.
+        /// </remarks>
+        public bool overrideModifiersNeedToBePressedFirst;
+
+        /// <summary>
+        /// Return the value of the <see cref="button"/> part while both <see cref="modifier1"/> and <see cref="modifier2"/>
+        /// are pressed. Otherwise return 0.
+        /// </summary>
+        /// <param name="context">Evaluation context passed in from the input system.</param>
+        /// <returns>The current value of the composite.</returns>
+        public override float ReadValue(ref InputBindingCompositeContext context)
+        {
+            if (ModifiersArePressed(ref context))
+                return context.ReadValue<float>(button);
+
+            return default;
+        }
+
+        private bool ModifiersArePressed(ref InputBindingCompositeContext context)
+        {
+            var modifiersDown = context.ReadValueAsButton(modifier1) && context.ReadValueAsButton(modifier2);
+
+            if (modifiersDown && !overrideModifiersNeedToBePressedFirst)
+            {
+                var timestamp = context.GetPressTime(button);
+                var timestamp1 = context.GetPressTime(modifier1);
+                var timestamp2 = context.GetPressTime(modifier2);
+
+                return timestamp1 <= timestamp && timestamp2 <= timestamp;
+            }
+
+            return modifiersDown;
+        }
+
+        /// <summary>
+        /// Same as <see cref="ReadValue"/> in this case.
+        /// </summary>
+        /// <param name="context">Evaluation context passed in from the input system.</param>
+        /// <returns>A >0 value if the composite is currently actuated.</returns>
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            return ReadValue(ref context);
+        }
+
+        protected override void FinishSetup(ref InputBindingCompositeContext context)
+        {
+            if (!overrideModifiersNeedToBePressedFirst)
+                overrideModifiersNeedToBePressedFirst = !InputSystem.settings.shortcutKeysConsumeInput;
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/ButtonWithTwoModifiers.cs.meta

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+  serializedVersion: 2
+  defaultReferences: []
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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/OneModifierComposite.cs

@@ -0,0 +1,184 @@
+using System;
+using System.ComponentModel;
+using Unity.Collections.LowLevel.Unsafe;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+using UnityEngine.Scripting;
+
+////TODO: allow making modifier optional; maybe alter the value (e.g. 0=unpressed, 0.5=pressed without modifier, 1=pressed with modifier)
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A binding with an additional modifier. The bound controls only trigger when
+    /// the modifier is pressed.
+    /// </summary>
+    /// <remarks>
+    /// This composite can be used to require a button to be held in order to "activate"
+    /// another binding.  This is most commonly used on keyboards to require one of the
+    /// modifier keys (shift, ctrl, or alt) to be held in combination with another control,
+    /// e.g. "CTRL+1".
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a button action that triggers when CTRL+1
+    /// // is pressed on the keyboard.
+    /// var action = new InputAction(type: InputActionType.Button);
+    /// action.AddCompositeBinding("OneModifier")
+    ///     .With("Modifier", "&lt;Keyboard&gt;/ctrl")
+    ///     .With("Binding", "&lt;Keyboard&gt;/1")
+    /// </code>
+    /// </example>
+    ///
+    /// However, this can also be used to "gate" other types of controls. For example, a "look"
+    /// action could be bound to mouse <see cref="Pointer.delta"/> such that the <see cref="Keyboard.altKey"/> on the
+    /// keyboard has to be pressed in order for the player to be able to look around.
+    ///
+    /// <example>
+    /// <code>
+    /// lookAction.AddCompositeBinding("OneModifier")
+    ///     .With("Modifier", "&lt;Keyboard&gt;/alt")
+    ///     .With("Binding", "&lt;Mouse&gt;/delta")
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="TwoModifiersComposite"/>
+    [DisplayStringFormat("{modifier}+{binding}")]
+    [DisplayName("Binding With One Modifier")]
+    public class OneModifierComposite : InputBindingComposite
+    {
+        /// <summary>
+        /// Binding for the button that acts as a modifier, e.g. <c>&lt;Keyboard/ctrl</c>.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int modifier;
+
+        /// <summary>
+        /// Binding for the control that is gated by the modifier. The composite will assume the value
+        /// of this control while the modifier is considered pressed (that is, has a magnitude equal to or
+        /// greater than the button press point).
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl] public int binding;
+
+        /// <summary>
+        /// Type of values read from controls bound to <see cref="binding"/>.
+        /// </summary>
+        public override Type valueType => m_ValueType;
+
+        /// <summary>
+        /// Size of the largest value that may be read from the controls bound to <see cref="binding"/>.
+        /// </summary>
+        public override int valueSizeInBytes => m_ValueSizeInBytes;
+
+        /// <summary>
+        /// If set to <c>true</c>, the built-in logic to determine if modifiers need to be pressed first is overridden.
+        /// Default value is <c>false</c>.
+        /// </summary>
+        /// <remarks>
+        /// By default, if <see cref="binding"/> is bound to only <see cref="Controls.ButtonControl"/>s, then the composite requires
+        /// <see cref="modifier"/> to be pressed <em>before</em> pressing <see cref="binding"/>. This means that binding to, for example,
+        /// <c>Ctrl+B</c>, the <c>ctrl</c> keys have to be pressed before pressing the <c>B</c> key. This is the behavior usually expected
+        /// with keyboard shortcuts.
+        ///
+        /// However, when binding, for example, <c>Ctrl+MouseDelta</c>, it should be possible to press <c>ctrl</c> at any time. The default
+        /// logic will automatically detect the difference between this binding and the button binding in the example above and behave
+        /// accordingly.
+        ///
+        /// This field allows you to explicitly override this default inference and make it so that regardless of what <see cref="binding"/>
+        /// is bound to, any press sequence is acceptable. For the example binding to <c>Ctrl+B</c>, it would mean that pressing <c>B</c> and
+        /// only then pressing <c>Ctrl</c> will still trigger the binding.
+        /// </remarks>
+        public bool overrideModifiersNeedToBePressedFirst;
+
+        private int m_ValueSizeInBytes;
+        private Type m_ValueType;
+        private bool m_BindingIsButton;
+
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            if (ModifierIsPressed(ref context))
+                return context.EvaluateMagnitude(binding);
+            return default;
+        }
+
+        /// <inheritdoc/>
+        public override unsafe void ReadValue(ref InputBindingCompositeContext context, void* buffer, int bufferSize)
+        {
+            if (ModifierIsPressed(ref context))
+                context.ReadValue(binding, buffer, bufferSize);
+            else
+                UnsafeUtility.MemClear(buffer, m_ValueSizeInBytes);
+        }
+
+        private bool ModifierIsPressed(ref InputBindingCompositeContext context)
+        {
+            var modifierDown = context.ReadValueAsButton(modifier);
+
+            // When the modifiers are gating a button, we require the modifiers to be pressed *first*.
+            if (modifierDown && m_BindingIsButton && !overrideModifiersNeedToBePressedFirst)
+            {
+                var timestamp = context.GetPressTime(binding);
+                var timestamp1 = context.GetPressTime(modifier);
+
+                return timestamp1 <= timestamp;
+            }
+
+            return modifierDown;
+        }
+
+        /// <inheritdoc/>
+        protected override void FinishSetup(ref InputBindingCompositeContext context)
+        {
+            DetermineValueTypeAndSize(ref context, binding, out m_ValueType, out m_ValueSizeInBytes, out m_BindingIsButton);
+
+            if (!overrideModifiersNeedToBePressedFirst)
+                overrideModifiersNeedToBePressedFirst = !InputSystem.settings.shortcutKeysConsumeInput;
+        }
+
+        public override object ReadValueAsObject(ref InputBindingCompositeContext context)
+        {
+            if (context.ReadValueAsButton(modifier))
+                return context.ReadValueAsObject(binding);
+            return null;
+        }
+
+        internal static void DetermineValueTypeAndSize(ref InputBindingCompositeContext context, int part, out Type valueType, out int valueSizeInBytes, out bool isButton)
+        {
+            valueSizeInBytes = 0;
+            isButton = true;
+
+            Type type = null;
+            foreach (var control in context.controls)
+            {
+                if (control.part != part)
+                    continue;
+
+                var controlType = control.control.valueType;
+                if (type == null || controlType.IsAssignableFrom(type))
+                    type = controlType;
+                else if (!type.IsAssignableFrom(controlType))
+                    type = typeof(Object);
+
+                valueSizeInBytes = Math.Max(control.control.valueSizeInBytes, valueSizeInBytes);
+
+                // *All* bound controls need to be buttons for us to classify this part as a "Button" part.
+                isButton &= control.control.isButton;
+            }
+
+            valueType = type;
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/OneModifierComposite.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 1a0a9c8a3d9c4893ab5389e009563314
+timeCreated: 1588685554

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/TwoModifiersComposite.cs

@@ -0,0 +1,171 @@
+using System;
+using System.ComponentModel;
+using Unity.Collections.LowLevel.Unsafe;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A binding with two additional modifiers modifier. The bound controls only trigger when
+    /// both modifiers are pressed.
+    /// </summary>
+    /// <remarks>
+    /// This composite can be used to require two buttons to be held in order to "activate"
+    /// another binding.  This is most commonly used on keyboards to require two of the
+    /// modifier keys (shift, ctrl, or alt) to be held in combination with another control,
+    /// e.g. "SHIFT+CTRL+1".
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a button action that triggers when SHIFT+CTRL+1
+    /// // is pressed on the keyboard.
+    /// var action = new InputAction(type: InputActionType.Button);
+    /// action.AddCompositeBinding("TwoModifiers")
+    ///     .With("Modifier", "&lt;Keyboard&gt;/ctrl")
+    ///     .With("Modifier", "&lt;Keyboard&gt;/shift")
+    ///     .With("Binding", "&lt;Keyboard&gt;/1")
+    /// </code>
+    /// </example>
+    ///
+    /// However, this can also be used to "gate" other types of controls. For example, a "look"
+    /// action could be bound to mouse <see cref="Pointer.delta"/> such that the <see cref="Keyboard.ctrlKey"/> and
+    /// <see cref="Keyboard.shiftKey"/> on the keyboard have to be pressed in order for the player to be able to
+    /// look around.
+    ///
+    /// <example>
+    /// <code>
+    /// var action = new InputAction();
+    /// action.AddCompositeBinding("TwoModifiers")
+    ///     .With("Modifier1", "&lt;Keyboard&gt;/ctrl")
+    ///     .With("Modifier2", "&lt;Keyboard&gt;/shift")
+    ///     .With("Binding", "&lt;Mouse&gt;/delta");
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="OneModifierComposite"/>
+    [DisplayStringFormat("{modifier1}+{modifier2}+{binding}")]
+    [DisplayName("Binding With Two Modifiers")]
+    public class TwoModifiersComposite : InputBindingComposite
+    {
+        /// <summary>
+        /// Binding for the first button that acts as a modifier, e.g. <c>&lt;Keyboard/leftCtrl</c>.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int modifier1;
+
+        /// <summary>
+        /// Binding for the second button that acts as a modifier, e.g. <c>&lt;Keyboard/leftCtrl</c>.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl(layout = "Button")] public int modifier2;
+
+        /// <summary>
+        /// Binding for the control that is gated by <see cref="modifier1"/> and <see cref="modifier2"/>.
+        /// The composite will assume the value of this button while both of the modifiers are pressed.
+        /// </summary>
+        /// <value>Part index to use with <see cref="InputBindingCompositeContext.ReadValue{T}(int)"/>.</value>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        // ReSharper disable once UnassignedField.Global
+        [InputControl] public int binding;
+
+        /// <summary>
+        /// If set to <c>true</c>, the built-in logic to determine if modifiers need to be pressed first is overridden.
+        /// Default value is <c>false</c>.
+        /// </summary>
+        /// <remarks>
+        /// By default, if <see cref="binding"/> is bound to only <see cref="Controls.ButtonControl"/>s, then the composite requires
+        /// both <see cref="modifier1"/> and <see cref="modifier2"/> to be pressed <em>before</em> pressing <see cref="binding"/>.
+        /// This means that binding to, for example, <c>Ctrl+Shift+B</c>, the <c>ctrl</c> and <c>shift</c> keys have to be pressed
+        /// before pressing the <c>B</c> key. This is the behavior usually expected with keyboard shortcuts.
+        ///
+        /// However, when binding, for example, <c>Ctrl+Shift+MouseDelta</c>, it should be possible to press <c>ctrl</c> and <c>shift</c>
+        /// at any time and in any order. The default logic will automatically detect the difference between this binding and the button
+        /// binding in the example above and behave accordingly.
+        ///
+        /// This field allows you to explicitly override this default inference and make it so that regardless of what <see cref="binding"/>
+        /// is bound to, any press sequence is acceptable. For the example binding to <c>Ctrl+Shift+B</c>, it would mean that pressing
+        /// <c>B</c> and only then pressing <c>Ctrl</c> and <c>Shift</c> will still trigger the binding.
+        /// </remarks>
+        public bool overrideModifiersNeedToBePressedFirst;
+
+        /// <summary>
+        /// Type of values read from controls bound to <see cref="binding"/>.
+        /// </summary>
+        public override Type valueType => m_ValueType;
+
+        /// <summary>
+        /// Size of the largest value that may be read from the controls bound to <see cref="binding"/>.
+        /// </summary>
+        public override int valueSizeInBytes => m_ValueSizeInBytes;
+
+        private int m_ValueSizeInBytes;
+        private Type m_ValueType;
+        private bool m_BindingIsButton;
+
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            if (ModifiersArePressed(ref context))
+                return context.EvaluateMagnitude(binding);
+            return default;
+        }
+
+        /// <inheritdoc/>
+        public override unsafe void ReadValue(ref InputBindingCompositeContext context, void* buffer, int bufferSize)
+        {
+            if (ModifiersArePressed(ref context))
+                context.ReadValue(binding, buffer, bufferSize);
+            else
+                UnsafeUtility.MemClear(buffer, m_ValueSizeInBytes);
+        }
+
+        private bool ModifiersArePressed(ref InputBindingCompositeContext context)
+        {
+            var modifiersDown = context.ReadValueAsButton(modifier1) && context.ReadValueAsButton(modifier2);
+
+            // When the modifiers are gating a button, we require the modifiers to be pressed *first*.
+            if (modifiersDown && m_BindingIsButton && !overrideModifiersNeedToBePressedFirst)
+            {
+                var timestamp = context.GetPressTime(binding);
+                var timestamp1 = context.GetPressTime(modifier1);
+                var timestamp2 = context.GetPressTime(modifier2);
+
+                return timestamp1 <= timestamp && timestamp2 <= timestamp;
+            }
+
+            return modifiersDown;
+        }
+
+        /// <inheritdoc/>
+        protected override void FinishSetup(ref InputBindingCompositeContext context)
+        {
+            OneModifierComposite.DetermineValueTypeAndSize(ref context, binding, out m_ValueType, out m_ValueSizeInBytes, out m_BindingIsButton);
+
+            if (!overrideModifiersNeedToBePressedFirst)
+                overrideModifiersNeedToBePressedFirst = !InputSystem.settings.shortcutKeysConsumeInput;
+        }
+
+        public override object ReadValueAsObject(ref InputBindingCompositeContext context)
+        {
+            if (context.ReadValueAsButton(modifier1) && context.ReadValueAsButton(modifier2))
+                return context.ReadValueAsObject(binding);
+            return null;
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/TwoModifiersComposite.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: be272fdf97df4e8daf1393dabdfa4cb8
+timeCreated: 1588685577

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/Vector2Composite.cs

@@ -0,0 +1,228 @@
+using System;
+using System.ComponentModel;
+using UnityEngine.InputSystem.Controls;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEngine.InputSystem.Editor;
+using UnityEngine.UIElements;
+#endif
+
+////TODO: add support for ramp up/down
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A 2D planar motion vector computed from an up+down button pair and a left+right
+    /// button pair.
+    /// </summary>
+    /// <remarks>
+    /// This composite allows to grab arbitrary buttons from a device and arrange them in
+    /// a D-Pad like configuration. Based on button presses, the composite will return a
+    /// normalized direction vector (normalization can be turned off via <see cref="mode"/>).
+    ///
+    /// Opposing motions cancel each other out. This means that if, for example, both the left
+    /// and right horizontal button are pressed, the resulting horizontal movement value will
+    /// be zero.
+    ///
+    /// <example>
+    /// <code>
+    /// // Set up WASD style keyboard controls.
+    /// action.AddCompositeBinding("2DVector")
+    ///     .With("Up", "&lt;Keyboard&gt;/w")
+    ///     .With("Left", "&lt;Keyboard&gt;/a")
+    ///     .With("Down", "&lt;Keyboard&gt;/s")
+    ///     .With("Right", "&lt;Keyboard&gt;/d");
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="Vector3Composite"/>
+    [DisplayStringFormat("{up}/{left}/{down}/{right}")] // This results in WASD.
+    [DisplayName("Up/Down/Left/Right Composite")]
+    public class Vector2Composite : InputBindingComposite<Vector2>
+    {
+        /// <summary>
+        /// Binding for the button that represents the up (that is, <c>(0,1)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int up;
+
+        /// <summary>
+        /// Binding for the button represents the down (that is, <c>(0,-1)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int down;
+
+        /// <summary>
+        /// Binding for the button represents the left (that is, <c>(-1,0)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int left;
+
+        /// <summary>
+        /// Binding for the button that represents the right (that is, <c>(1,0)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        [InputControl(layout = "Axis")] public int right;
+
+        [Obsolete("Use Mode.DigitalNormalized with 'mode' instead")]
+        public bool normalize = true;
+
+        /// <summary>
+        /// How to synthesize a <c>Vector2</c> from the values read from <see cref="up"/>, <see cref="down"/>,
+        /// <see cref="left"/>, and <see cref="right"/>.
+        /// </summary>
+        /// <value>Determines how X and Y of the resulting <c>Vector2</c> are formed from input values.</value>
+        /// <remarks>
+        /// <example>
+        /// <code>
+        /// var action = new InputAction();
+        ///
+        /// // DigitalNormalized composite (the default). Turns gamepad left stick into
+        /// // control equivalent to the D-Pad.
+        /// action.AddCompositeBinding("2DVector(mode=0)")
+        ///     .With("up", "&lt;Gamepad&gt;/leftStick/up")
+        ///     .With("down", "&lt;Gamepad&gt;/leftStick/down")
+        ///     .With("left", "&lt;Gamepad&gt;/leftStick/left")
+        ///     .With("right", "&lt;Gamepad&gt;/leftStick/right");
+        ///
+        /// // Digital composite. Turns gamepad left stick into control equivalent
+        /// // to the D-Pad except that diagonals will not be normalized.
+        /// action.AddCompositeBinding("2DVector(mode=1)")
+        ///     .With("up", "&lt;Gamepad&gt;/leftStick/up")
+        ///     .With("down", "&lt;Gamepad&gt;/leftStick/down")
+        ///     .With("left", "&lt;Gamepad&gt;/leftStick/left")
+        ///     .With("right", "&lt;Gamepad&gt;/leftStick/right");
+        ///
+        /// // Analog composite. In this case results in setup that behaves exactly
+        /// // the same as leftStick already does. But you could use it, for example,
+        /// // to swap directions by binding "up" to leftStick/down and "down" to
+        /// // leftStick/up.
+        /// action.AddCompositeBinding("2DVector(mode=2)")
+        ///     .With("up", "&lt;Gamepad&gt;/leftStick/up")
+        ///     .With("down", "&lt;Gamepad&gt;/leftStick/down")
+        ///     .With("left", "&lt;Gamepad&gt;/leftStick/left")
+        ///     .With("right", "&lt;Gamepad&gt;/leftStick/right");
+        /// </code>
+        /// </example>
+        /// </remarks>
+        public Mode mode;
+
+        /// <inheritdoc />
+        public override Vector2 ReadValue(ref InputBindingCompositeContext context)
+        {
+            var mode = this.mode;
+
+            if (mode == Mode.Analog)
+            {
+                var upValue = context.ReadValue<float>(up);
+                var downValue = context.ReadValue<float>(down);
+                var leftValue = context.ReadValue<float>(left);
+                var rightValue = context.ReadValue<float>(right);
+
+                return DpadControl.MakeDpadVector(upValue, downValue, leftValue, rightValue);
+            }
+
+            var upIsPressed = context.ReadValueAsButton(up);
+            var downIsPressed = context.ReadValueAsButton(down);
+            var leftIsPressed = context.ReadValueAsButton(left);
+            var rightIsPressed = context.ReadValueAsButton(right);
+
+            // Legacy. We need to reference the obsolete member here so temporarily
+            // turn of the warning.
+            #pragma warning disable CS0618
+            if (!normalize) // Was on by default.
+                mode = Mode.Digital;
+            #pragma warning restore CS0618
+
+            return DpadControl.MakeDpadVector(upIsPressed, downIsPressed, leftIsPressed, rightIsPressed, mode == Mode.DigitalNormalized);
+        }
+
+        /// <inheritdoc />
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            var value = ReadValue(ref context);
+            return value.magnitude;
+        }
+
+        /// <summary>
+        /// Determines how a <c>Vector2</c> is synthesized from part controls.
+        /// </summary>
+        public enum Mode
+        {
+            /// <summary>
+            /// Part controls are treated as analog meaning that the floating-point values read from controls
+            /// will come through as is (minus the fact that the down and left direction values are negated).
+            /// </summary>
+            Analog = 2,
+
+            /// <summary>
+            /// Part controls are treated as buttons (on/off) and the resulting vector is normalized. This means
+            /// that if, for example, both left and up are pressed, instead of returning a vector (-1,1), a vector
+            /// of roughly (-0.7,0.7) (that is, corresponding to <c>new Vector2(-1,1).normalized</c>) is returned instead.
+            /// The resulting 2D area is diamond-shaped.
+            /// </summary>
+            DigitalNormalized = 0,
+
+            /// <summary>
+            /// Part controls are treated as buttons (on/off) and the resulting vector is not normalized. This means
+            /// that if, for example, both left and up are pressed, the resulting vector is (-1,1) and has a length
+            /// greater than 1. The resulting 2D area is box-shaped.
+            /// </summary>
+            Digital = 1
+        }
+    }
+
+    #if UNITY_EDITOR
+    internal class Vector2CompositeEditor : InputParameterEditor<Vector2Composite>
+    {
+        private GUIContent m_ModeLabel = new GUIContent("Mode",
+            "How to synthesize a Vector2 from the inputs. Digital "
+            + "treats part bindings as buttons (on/off) whereas Analog preserves "
+            + "floating-point magnitudes as read from controls.");
+
+        public override void OnGUI()
+        {
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+#endif
+            target.mode = (Vector2Composite.Mode)EditorGUILayout.EnumPopup(m_ModeLabel, target.mode);
+        }
+
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+        public override void OnDrawVisualElements(VisualElement root, Action onChangedCallback)
+        {
+            var modeField = new EnumField(m_ModeLabel.text, target.mode)
+            {
+                tooltip = m_ModeLabel.tooltip
+            };
+
+            modeField.RegisterValueChangedCallback(evt =>
+            {
+                target.mode = (Vector2Composite.Mode)evt.newValue;
+                onChangedCallback();
+            });
+
+            root.Add(modeField);
+        }
+
+#endif
+    }
+    #endif
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/Vector2Composite.cs.meta

@@ -0,0 +1,11 @@
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/Vector3Composite.cs

@@ -0,0 +1,208 @@
+using System;
+using System.ComponentModel;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEngine.InputSystem.Editor;
+using UnityEngine.UIElements;
+#endif
+
+namespace UnityEngine.InputSystem.Composites
+{
+    /// <summary>
+    /// A 3D vector formed from six floating-point inputs.
+    /// </summary>
+    /// <remarks>
+    /// Depending on the setting of <see cref="mode"/>, the vector is either in  the [-1..1]
+    /// range on each axis (normalized or not depending on <see cref="mode"/>) or is in the
+    /// full value range of the input controls.
+    ///
+    /// <example>
+    /// <code>
+    /// action.AddCompositeBinding("3DVector")
+    ///     .With("Forward", "&lt;Keyboard&gt;/w")
+    ///     .With("Backward", "&lt;Keyboard&gt;/s")
+    ///     .With("Left", "&lt;Keyboard&gt;/a")
+    ///     .With("Right", "&lt;Keyboard&gt;/d")
+    ///     .With("Up", "&lt;Keyboard&gt;/q")
+    ///     .With("Down", "&lt;Keyboard&gt;/e");
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="Vector2Composite"/>
+    [DisplayStringFormat("{up}+{down}/{left}+{right}/{forward}+{backward}")]
+    [DisplayName("Up/Down/Left/Right/Forward/Backward Composite")]
+    public class Vector3Composite : InputBindingComposite<Vector3>
+    {
+        /// <summary>
+        /// Binding for the button that represents the up (that is, <c>(0,1,0)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int up;
+
+        /// <summary>
+        /// Binding for the button that represents the down (that is, <c>(0,-1,0)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int down;
+
+        /// <summary>
+        /// Binding for the button that represents the left (that is, <c>(-1,0,0)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int left;
+
+        /// <summary>
+        /// Binding for the button that represents the right (that is, <c>(1,0,0)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int right;
+
+        /// <summary>
+        /// Binding for the button that represents the right (that is, <c>(0,0,1)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int forward;
+
+        /// <summary>
+        /// Binding for the button that represents the right (that is, <c>(0,0,-1)</c>) direction of the vector.
+        /// </summary>
+        /// <remarks>
+        /// This property is automatically assigned by the input system.
+        /// </remarks>
+        // ReSharper disable once MemberCanBePrivate.Global
+        // ReSharper disable once FieldCanBeMadeReadOnly.Global
+        [InputControl(layout = "Axis")] public int backward;
+
+        /// <summary>
+        /// How to synthesize a <c>Vector3</c> from the values read from <see cref="up"/>, <see cref="down"/>,
+        /// <see cref="left"/>, <see cref="right"/>, <see cref="forward"/>, and <see cref="backward"/>.
+        /// </summary>
+        /// <value>Determines how X, Y, and Z of the resulting <c>Vector3</c> are formed from input values.</value>
+        public Mode mode = Mode.Analog;
+
+        /// <inheritdoc/>
+        public override Vector3 ReadValue(ref InputBindingCompositeContext context)
+        {
+            if (mode == Mode.Analog)
+            {
+                var upValue = context.ReadValue<float>(up);
+                var downValue = context.ReadValue<float>(down);
+                var leftValue = context.ReadValue<float>(left);
+                var rightValue = context.ReadValue<float>(right);
+                var forwardValue = context.ReadValue<float>(forward);
+                var backwardValue = context.ReadValue<float>(backward);
+
+                return new Vector3(rightValue - leftValue, upValue - downValue, forwardValue - backwardValue);
+            }
+            else
+            {
+                var upValue = context.ReadValueAsButton(up) ? 1f : 0f;
+                var downValue = context.ReadValueAsButton(down) ? -1f : 0f;
+                var leftValue = context.ReadValueAsButton(left) ? -1f : 0f;
+                var rightValue = context.ReadValueAsButton(right) ? 1f : 0f;
+                var forwardValue = context.ReadValueAsButton(forward) ? 1f : 0f;
+                var backwardValue = context.ReadValueAsButton(backward) ? -1f : 0f;
+
+                var vector = new Vector3(leftValue + rightValue, upValue + downValue, forwardValue + backwardValue);
+
+                if (mode == Mode.DigitalNormalized)
+                    vector = vector.normalized;
+
+                return vector;
+            }
+        }
+
+        /// <inheritdoc />
+        public override float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            var value = ReadValue(ref context);
+            return value.magnitude;
+        }
+
+        /// <summary>
+        /// Determines how a <c>Vector3</c> is synthesized from part controls.
+        /// </summary>
+        public enum Mode
+        {
+            /// <summary>
+            /// Part controls are treated as analog meaning that the floating-point values read from controls
+            /// will come through as is (minus the fact that the down and left direction values are negated).
+            /// </summary>
+            Analog,
+
+            /// <summary>
+            /// Part controls are treated as buttons (on/off) and the resulting vector is normalized. This means
+            /// that if, for example, both left and up are pressed, instead of returning a vector (-1,1,0), a vector
+            /// of roughly (-0.7,0.7,0) (that is, corresponding to <c>new Vector3(-1,1,0).normalized</c>) is returned instead.
+            /// </summary>
+            DigitalNormalized,
+
+            /// <summary>
+            /// Part controls are treated as buttons (on/off) and the resulting vector is not normalized. This means
+            /// that if both left and up are pressed, for example, the resulting vector is (-1,1,0) and has a length
+            /// greater than 1.
+            /// </summary>
+            Digital,
+        }
+    }
+
+    #if UNITY_EDITOR
+    internal class Vector3CompositeEditor : InputParameterEditor<Vector3Composite>
+    {
+        private GUIContent m_ModeLabel = new GUIContent("Mode",
+            "How to synthesize a Vector3 from the inputs. Digital "
+            + "treats part bindings as buttons (on/off) whereas Analog preserves "
+            + "floating-point magnitudes as read from controls.");
+
+        public override void OnGUI()
+        {
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+            if (!InputSystem.settings.IsFeatureEnabled(InputFeatureNames.kUseIMGUIEditorForAssets)) return;
+#endif
+            target.mode = (Vector3Composite.Mode)EditorGUILayout.EnumPopup(m_ModeLabel, target.mode);
+        }
+
+#if UNITY_INPUT_SYSTEM_PROJECT_WIDE_ACTIONS
+        public override void OnDrawVisualElements(VisualElement root, Action onChangedCallback)
+        {
+            var modeField = new EnumField(m_ModeLabel.text, target.mode)
+            {
+                tooltip = m_ModeLabel.tooltip
+            };
+
+            modeField.RegisterValueChangedCallback(evt =>
+            {
+                target.mode = (Vector3Composite.Mode)evt.newValue;
+                onChangedCallback();
+            });
+
+            root.Add(modeField);
+        }
+
+#endif
+    }
+    #endif
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/Composites/Vector3Composite.cs.meta

@@ -0,0 +1,3 @@
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+guid: cda1b45d3bda468a95dca208b99174da
+timeCreated: 1597842391

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/IInputActionCollection.cs

@@ -0,0 +1,144 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine.InputSystem.Utilities;
+
+////TODO: move indexer up here
+
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// A collection of input actions (see <see cref="InputAction"/>).
+    /// </summary>
+    /// <seealso cref="InputActionMap"/>
+    /// <seealso cref="InputActionAsset"/>
+    public interface IInputActionCollection : IEnumerable<InputAction>
+    {
+        /// <summary>
+        /// Optional mask applied to all bindings in the collection.
+        /// </summary>
+        /// <remarks>
+        /// If this is not null, only bindings that match the mask will be used.
+        ///
+        /// Modifying this property while any of the actions in the collection are enabled will
+        /// lead to the actions getting disabled temporarily and then re-enabled.
+        /// </remarks>
+        InputBinding? bindingMask { get; set; }
+
+        ////REVIEW: should this allow restricting to a set of controls instead of confining it to just devices?
+        /// <summary>
+        /// Devices to use with the actions in this collection.
+        /// </summary>
+        /// <remarks>
+        /// If this is set, actions in the collection will exclusively bind to devices
+        /// in the given list. For example, if two gamepads are present in the system yet
+        /// only one gamepad is listed here, then a "&lt;Gamepad&gt;/leftStick" binding will
+        /// only bind to the gamepad in the list and not to the one that is only available
+        /// globally.
+        ///
+        /// Modifying this property after bindings in the collection have already been resolved,
+        /// will lead to <see cref="InputAction.controls"/> getting refreshed. If any of the actions
+        /// in the collection are currently in progress (see <see cref="InputAction.phase"/>),
+        /// the actions will remain unaffected and in progress except if the controls currently
+        /// driving them (see <see cref="InputAction.activeControl"/>) are no longer part of any
+        /// of the selected devices. In that case, the action is <see cref="InputAction.canceled"/>.
+        /// </remarks>
+        ReadOnlyArray<InputDevice>? devices { get; set; }
+
+        /// <summary>
+        /// List of control schemes defined for the set of actions.
+        /// </summary>
+        /// <remarks>
+        /// Control schemes are optional and the list may be empty.
+        /// </remarks>
+        ReadOnlyArray<InputControlScheme> controlSchemes { get; }
+
+        /// <summary>
+        /// Check whether the given action is contained in this collection.
+        /// </summary>
+        /// <param name="action">An arbitrary input action.</param>
+        /// <returns>True if the given action is contained in the collection, false if not.</returns>
+        /// <remarks>
+        /// Calling this method will not allocate GC memory (unlike when iterating generically
+        /// over the collection). Also, a collection may have a faster containment check rather than
+        /// having to search through all its actions.
+        /// </remarks>
+        bool Contains(InputAction action);
+
+        /// <summary>
+        /// Enable all actions in the collection.
+        /// </summary>
+        /// <seealso cref="InputAction.Enable"/>
+        /// <seealso cref="InputAction.enabled"/>
+        void Enable();
+
+        /// <summary>
+        /// Disable all actions in the collection.
+        /// </summary>
+        /// <seealso cref="InputAction.Disable"/>
+        /// <seealso cref="InputAction.enabled"/>
+        void Disable();
+    }
+
+    /// <summary>
+    /// An extended version of <see cref="IInputActionCollection"/>.
+    /// </summary>
+    /// <remarks>
+    /// This interface will be merged into <see cref="IInputActionCollection"/> in a future (major) version.
+    /// </remarks>
+    public interface IInputActionCollection2 : IInputActionCollection
+    {
+        /// <summary>
+        /// Iterate over all bindings in the collection of actions.
+        /// </summary>
+        /// <seealso cref="InputActionMap.bindings"/>
+        /// <seealso cref="InputAction.bindings"/>
+        /// <seealso cref="InputActionAsset.bindings"/>
+        IEnumerable<InputBinding> bindings { get; }
+
+        /// <summary>
+        /// Find an <see cref="InputAction"/> in the collection by its <see cref="InputAction.name"/> or
+        /// by its <see cref="InputAction.id"/> (in string form).
+        /// </summary>
+        /// <param name="actionNameOrId">Name of the action as either a "map/action" combination (e.g. "gameplay/fire") or
+        /// a simple name. In the former case, the name is split at the '/' slash and the first part is used to find
+        /// a map with that name and the second part is used to find an action with that name inside the map. In the
+        /// latter case, all maps are searched in order and the first action that has the given name in any of the maps
+        /// is returned. Note that name comparisons are case-insensitive.
+        ///
+        /// Alternatively, the given string can be a GUID as given by <see cref="InputAction.id"/>.</param>
+        /// <param name="throwIfNotFound">If <c>true</c>, instead of returning <c>null</c> when the action
+        /// cannot be found, throw <c>ArgumentException</c>.</param>
+        /// <returns>The action with the corresponding name or <c>null</c> if no matching action could be found.</returns>
+        /// <exception cref="ArgumentNullException"><paramref name="actionNameOrId"/> is <c>null</c>.</exception>
+        /// <exception cref="ArgumentException">Thrown if <paramref name="throwIfNotFound"/> is true and the
+        /// action could not be found. -Or- If <paramref name="actionNameOrId"/> contains a slash but is missing
+        /// either the action or the map name.</exception>
+        InputAction FindAction(string actionNameOrId, bool throwIfNotFound = false);
+
+        /// <summary>
+        /// Find the index of the first binding that matches the given mask.
+        /// </summary>
+        /// <param name="mask">A binding. See <see cref="InputBinding.Matches"/> for details.</param>
+        /// <param name="action">Receives the action on which the binding was found. If none was found,
+        /// will be set to <c>null</c>.</param>
+        /// <returns>Index into <see cref="InputAction.bindings"/> of <paramref name="action"/> of the binding
+        /// that matches <paramref name="mask"/>. If no binding matches, will return -1.</returns>
+        /// <remarks>
+        /// For details about matching bindings by a mask, see <see cref="InputBinding.Matches"/>.
+        ///
+        /// <example>
+        /// <code>
+        /// var index = playerInput.actions.FindBinding(
+        ///     new InputBinding { path = "&lt;Gamepad&gt;/buttonSouth" },
+        ///     out var action);
+        ///
+        /// if (index != -1)
+        ///     Debug.Log($"The A button is bound to {action}");
+        /// </code>
+        /// </example>
+        /// </remarks>
+        /// <seealso cref="InputBinding.Matches"/>
+        /// <seealso cref="bindings"/>
+        int FindBinding(InputBinding mask, out InputAction action);
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/IInputActionCollection.cs.meta

@@ -0,0 +1,11 @@
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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/IInputInteraction.cs

@@ -0,0 +1,337 @@
+using System;
+using System.ComponentModel;
+using System.Reflection;
+using UnityEngine.InputSystem.Utilities;
+using UnityEngine.Scripting;
+
+// [GESTURES]
+// Idea for v2 of the input system:
+//     Separate interaction *recognition* from interaction *representation*
+//     This will likely also "solve" gestures
+//
+//     ATM, an interaction is a prebuilt thing that rolls recognition and representation of an interaction into
+//     one single thing. That limits how powerful this can be. There's only ever one interaction coming from each interaction
+//     added to a setup.
+//
+//     A much more powerful way would be to have the interactions configured on actions and bindings add *recognizers*
+//     which then *generate* interactions. This way, a single recognizer could spawn arbitrary many interactions. What the
+//     recognizer is attached to (the bindings) would simply act as triggers. Beyond that, the recognizer would have
+//     plenty freedom to start, perform, and stop interactions happening in response to input.
+//
+//     It'll likely be a breaking change as far as user-implemented interactions go but at least the data as it looks today
+//     should work with this just fine.
+
+////TODO: allow interactions to be constrained to a specific InputActionType
+
+////TODO: add way for parameters on interactions and processors to be driven from global value source that is NOT InputSettings
+////      (ATM it's very hard to e.g. have a scale value on gamepad stick bindings which is determined dynamically from player
+////      settings in the game)
+
+////REVIEW: what about putting an instance of one of these on every resolved control instead of sharing it between all controls resolved from a binding?
+
+////REVIEW: can we have multiple interactions work together on the same binding? E.g. a 'Press' causing a start and a 'Release' interaction causing a performed
+
+////REVIEW: have a default interaction so that there *always* is an interaction object when processing triggers?
+
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// Interface for interaction patterns that drive actions.
+    /// </summary>
+    /// <remarks>
+    /// Actions have a built-in interaction pattern that to some extent depends on their type (<see
+    /// cref="InputActionType"/>, <see cref="InputAction.type"/>). What this means is that when controls
+    /// bound to an action are actuated, the action will initiate an interaction that in turn determines
+    /// when <see cref="InputAction.started"/>, <see cref="InputAction.performed"/>, and <see cref="InputAction.canceled"/>
+    /// are called.
+    ///
+    /// The default interaction (that is, when no interaction has been added to a binding or the
+    /// action that the binding targets) will generally start and perform an action as soon as a control
+    /// is actuated, then perform the action whenever the value of the control changes except if the value
+    /// changes back to the default in which case the action is cancelled.
+    ///
+    /// By writing custom interactions, it is possible to implement different interactions. For example,
+    /// <see cref="Interactions.HoldInteraction"/> will only start when a control is being actuated but
+    /// will only perform the action if the control is held for a minimum amount of time.
+    ///
+    /// Interactions can be stateful and mutate state over time. In fact, interactions will usually
+    /// represent miniature state machines driven directly by input.
+    ///
+    /// Multiple interactions can be applied to the same binding. The interactions will be processed in
+    /// sequence. However, the first interaction that starts the action will get to drive the state of
+    /// the action. If it performs the action, all interactions are reset. If it cancels, the first
+    /// interaction in the list that is in started state will get to take over and drive the action.
+    ///
+    /// This makes it possible to have several interaction patterns on the same action. For example,
+    /// to have a "fire" action that allows for charging, one can have a "Hold" and a "Press" interaction
+    /// in sequence on the action.
+    ///
+    /// <example>
+    /// <code>
+    /// // Create a fire action with two interactions:
+    /// // 1. Hold. Triggers charged firing. Has to come first as otherwise "Press" will immediately perform the action.
+    /// // 2. Press. Triggers instant firing.
+    /// // NOTE: An alternative is to use "Tap;Hold", that is, a "Tap" first and then a "Hold". The difference
+    /// //       is relatively minor. In this setup, the "Tap" turns into a "Hold" if the button is held for
+    /// //       longer than the tap time whereas in the setup below, the "Hold" turns into a "Press" if the
+    /// //       button is released before the hold time has been reached.
+    /// var fireAction = new InputAction(type: InputActionType.Button, interactions: "Hold;Press");
+    /// fireAction.AddBinding("&lt;Gamepad&gt;/buttonSouth");
+    /// </code>
+    /// </example>
+    ///
+    /// Custom interactions are automatically registered by reflection but it can also be manually registered using <see cref="InputSystem.RegisterInteraction"/>. This can be
+    /// done at any point during or after startup but has to be done before actions that reference the interaction
+    /// are enabled or have their controls queried. A good point is usually to do it during loading like so:
+    ///
+    /// <example>
+    /// <code>
+    /// #if UNITY_EDITOR
+    /// [InitializeOnLoad]
+    /// #endif
+    /// public class MyInteraction : IInputInteraction
+    /// {
+    ///     public void Process(ref InputInteractionContext context)
+    ///     {
+    ///         // ...
+    ///     }
+    ///
+    ///     public void Reset()
+    ///     {
+    ///     }
+    ///
+    ///     static MyInteraction()
+    ///     {
+    ///         InputSystem.RegisterInteraction&lt;MyInteraction&gt;();
+    ///     }
+    ///
+    ///     [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+    ///     private static void Initialize()
+    ///     {
+    ///         // Will execute the static constructor as a side effect.
+    ///     }
+    /// }
+    /// </code>
+    /// </example>
+    ///
+    /// If your interaction will only work with a specific type of value (e.g. <c>float</c>), it is better
+    /// to base the implementation on <see cref="IInputInteraction{TValue}"/> instead. While the interface is the
+    /// same, the type parameter communicates to the input system that only controls that have compatible value
+    /// types should be used with your interaction.
+    ///
+    /// Interactions, like processors (<see cref="InputProcessor"/>) and binding composites (<see cref="InputBindingComposite"/>)
+    /// may define their own parameters which can then be configured through the editor UI or set programmatically in
+    /// code. To define a parameter, add a public field to your class that has either a <c>bool</c>, an <c>int</c>,
+    /// a <c>float</c>, or an <c>enum</c> type. To set defaults for the parameters, assign default values
+    /// to the fields.
+    ///
+    /// <example>
+    /// <code>
+    /// public class MyInteraction : IInputInteraction
+    /// {
+    ///     public bool boolParameter;
+    ///     public int intParameter;
+    ///     public float floatParameter;
+    ///     public MyEnum enumParameter = MyEnum.C; // Custom default.
+    ///
+    ///     public enum MyEnum
+    ///     {
+    ///         A,
+    ///         B,
+    ///         C
+    ///     }
+    ///
+    ///     public void Process(ref InputInteractionContext context)
+    ///     {
+    ///         // ...
+    ///     }
+    ///
+    ///     public void Reset()
+    ///     {
+    ///     }
+    /// }
+    ///
+    /// // The parameters can be configured graphically in the editor or set programmatically in code.
+    /// // NOTE: Enum parameters are represented by their integer values. However, when setting enum parameters
+    /// //       graphically in the UI, they will be presented as a dropdown using the available enum values.
+    /// var action = new InputAction(interactions: "MyInteraction(boolParameter=true,intParameter=1,floatParameter=1.2,enumParameter=1);
+    /// </code>
+    /// </example>
+    ///
+    /// A default UI will be presented in the editor UI to configure the parameters of your interaction.
+    /// You can customize this by replacing the default UI with a custom implementation using <see cref="Editor.InputParameterEditor"/>.
+    /// This mechanism is the same as for processors and binding composites.
+    ///
+    /// <example>
+    /// <code>
+    /// #if UNITY_EDITOR
+    /// public class MyCustomInteractionEditor : InputParameterEditor&lt;MyCustomInteraction&gt;
+    /// {
+    ///     protected override void OnEnable()
+    ///     {
+    ///         // Do any setup work you need.
+    ///     }
+    ///
+    ///     protected override void OnGUI()
+    ///     {
+    ///         // Use standard Unity UI calls do create your own parameter editor UI.
+    ///     }
+    /// }
+    /// #endif
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="InputSystem.RegisterInteraction"/>
+    /// <seealso cref="InputBinding.interactions"/>
+    /// <seealso cref="InputAction.interactions"/>
+    /// <seealso cref="Editor.InputParameterEditor"/>
+    /// <seealso cref="InputActionRebindingExtensions.GetParameterValue(InputAction,string,InputBinding)"/>
+    /// <seealso cref="InputActionRebindingExtensions.ApplyParameterOverride(InputActionMap,string,PrimitiveValue,InputBinding)"/>
+    public interface IInputInteraction
+    {
+        /// <summary>
+        /// Perform processing of the interaction in response to input.
+        /// </summary>
+        /// <param name="context"></param>
+        /// <remarks>
+        /// This method is called whenever a control referenced in the binding that the interaction sits on
+        /// changes value. The interaction is expected to process the value change and, if applicable, call
+        /// <see cref="InputInteractionContext.Started"/> and/or its related methods to initiate a state change.
+        ///
+        /// Note that if "control disambiguation" (i.e. the process where if multiple controls are bound to
+        /// the same action, the system decides which control gets to drive the action at any one point) is
+        /// in effect -- i.e. when either <see cref="InputActionType.Button"/> or <see cref="InputActionType.Value"/>
+        /// are used but not if <see cref="InputActionType.PassThrough"/> is used -- inputs that the disambiguation
+        /// chooses to ignore will cause this method to not be called.
+        ///
+        /// Note that this method is called on the interaction even when there are multiple interactions
+        /// and the interaction is not the one currently in control of the action (because another interaction
+        /// that comes before it in the list had already started the action). Each interaction will get
+        /// processed independently and the action will decide when to use which interaction to drive the
+        /// action as a whole.
+        ///
+        /// <example>
+        /// <code>
+        ///     // Processing for an interaction that will perform the action only if a control
+        ///     // is held at least at 3/4 actuation for at least 1 second.
+        ///     public void Process(ref InputInteractionContext context)
+        ///     {
+        ///         var control = context.control;
+        ///
+        ///         // See if we're currently tracking a control.
+        ///         if (m_Control != null)
+        ///         {
+        ///             // Ignore any input on a control we're not currently tracking.
+        ///             if (m_Control != control)
+        ///                 return;
+        ///
+        ///             // Check if the control is currently actuated past our 3/4 threshold.
+        ///             var isStillActuated = context.ControlIsActuated(0.75f);
+        ///
+        ///             // See for how long the control has been held.
+        ///             var actuationTime = context.time - context.startTime;
+        ///
+        ///             if (!isStillActuated)
+        ///             {
+        ///                 // Control is no longer actuated above 3/4 threshold. If it was held
+        ///                 // for at least a second, perform the action. Otherwise cancel it.
+        ///
+        ///                 if (actuationTime >= 1)
+        ///                     context.Performed();
+        ///                 else
+        ///                     context.Cancelled();
+        ///             }
+        ///
+        ///             // Control changed value somewhere above 3/4 of its actuation. Doesn't
+        ///             // matter to us so no change.
+        ///         }
+        ///         else
+        ///         {
+        ///             // We're not already tracking a control. See if the control that just triggered
+        ///             // is actuated at least 3/4th of its way. If so, start tracking it.
+        ///
+        ///             var isActuated = context.ControlIsActuated(0.75f);
+        ///             if (isActuated)
+        ///             {
+        ///                 m_Control = context.control;
+        ///                 context.Started();
+        ///             }
+        ///         }
+        ///     }
+        ///
+        ///     InputControl m_Control;
+        ///
+        ///     public void Reset()
+        ///     {
+        ///         m_Control = null;
+        ///     }
+        /// </code>
+        /// </example>
+        /// </remarks>
+        void Process(ref InputInteractionContext context);
+
+        /// <summary>
+        /// Reset state that the interaction may hold. This should put the interaction back in its original
+        /// state equivalent to no input yet having been received.
+        /// </summary>
+        void Reset();
+    }
+
+    /// <summary>
+    /// Identical to <see cref="IInputInteraction"/> except that it allows an interaction to explicitly
+    /// advertise the value it expects.
+    /// </summary>
+    /// <typeparam name="TValue">Type of values expected by the interaction</typeparam>
+    /// <remarks>
+    /// Advertising the value type will an interaction type to be filtered out in the UI if the value type
+    /// it has is not compatible with the value type expected by the action.
+    ///
+    /// In all other ways, this interface is identical to <see cref="IInputInteraction"/>.
+    /// </remarks>
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1040:AvoidEmptyInterfaces", Justification = "This interface is used to mark implementing classes to advertise the value it expects. This seems more elegant then the suggestion to use an attribute.")]
+    public interface IInputInteraction<TValue> : IInputInteraction
+        where TValue : struct
+    {
+    }
+
+    internal static class InputInteraction
+    {
+        public static TypeTable s_Interactions;
+
+        public static Type GetValueType(Type interactionType)
+        {
+            if (interactionType == null)
+                throw new ArgumentNullException(nameof(interactionType));
+
+            return TypeHelpers.GetGenericTypeArgumentFromHierarchy(interactionType, typeof(IInputInteraction<>), 0);
+        }
+
+        public static string GetDisplayName(string interaction)
+        {
+            if (string.IsNullOrEmpty(interaction))
+                throw new ArgumentNullException(nameof(interaction));
+
+            var interactionType = s_Interactions.LookupTypeRegistration(interaction);
+            if (interactionType == null)
+                return interaction;
+
+            return GetDisplayName(interactionType);
+        }
+
+        public static string GetDisplayName(Type interactionType)
+        {
+            if (interactionType == null)
+                throw new ArgumentNullException(nameof(interactionType));
+
+            var displayNameAttribute = interactionType.GetCustomAttribute<DisplayNameAttribute>();
+            if (displayNameAttribute == null)
+            {
+                if (interactionType.Name.EndsWith("Interaction"))
+                    return interactionType.Name.Substring(0, interactionType.Name.Length - "Interaction".Length);
+                return interactionType.Name;
+            }
+
+            return displayNameAttribute.DisplayName;
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/IInputInteraction.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputAction.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionChange.cs

@@ -0,0 +1,68 @@
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// Indicates what type of change related to an <see cref="InputAction">input action</see> occurred.
+    /// </summary>
+    /// <seealso cref="InputSystem.onActionChange"/>
+    public enum InputActionChange
+    {
+        /// <summary>
+        /// An individual action was enabled.
+        /// </summary>
+        /// <seealso cref="InputAction.Enable"/>
+        ActionEnabled,
+
+        /// <summary>
+        /// An individual action was disabled.
+        /// </summary>
+        /// <seealso cref="InputAction.Disable"/>
+        ActionDisabled,
+
+        /// <summary>
+        /// An <see cref="InputActionMap">action map</see> was enabled.
+        /// </summary>
+        /// <seealso cref="InputActionMap.Enable"/>
+        ActionMapEnabled,
+
+        /// <summary>
+        /// An <see cref="InputActionMap">action map</see> was disabled.
+        /// </summary>
+        /// <seealso cref="InputActionMap.Disable"/>
+        ActionMapDisabled,
+
+        /// <summary>
+        /// An <see cref="InputAction"/> was started.
+        /// </summary>
+        /// <seealso cref="InputAction.started"/>
+        /// <seealso cref="InputActionPhase.Started"/>
+        ActionStarted,
+
+        /// <summary>
+        /// An <see cref="InputAction"/> was performed.
+        /// </summary>
+        /// <seealso cref="InputAction.performed"/>
+        /// <seealso cref="InputActionPhase.Performed"/>
+        ActionPerformed,
+
+        /// <summary>
+        /// An <see cref="InputAction"/> was canceled.
+        /// </summary>
+        /// <seealso cref="InputAction.canceled"/>
+        /// <seealso cref="InputActionPhase.Canceled"/>
+        ActionCanceled,
+
+        /// <summary>
+        /// Bindings on an action or set of actions are about to be re-resolved. This is called while <see cref="InputAction.controls"/>
+        /// for actions are still untouched and thus still reflect the old binding state of each action.
+        /// </summary>
+        /// <seealso cref="InputAction.controls"/>
+        BoundControlsAboutToChange,
+
+        /// <summary>
+        /// Bindings on an action or set of actions have been resolved. This is called after <see cref="InputAction.controls"/>
+        /// have been updated.
+        /// </summary>
+        /// <seealso cref="InputAction.controls"/>
+        BoundControlsChanged,
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionChange.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionPhase.cs

@@ -0,0 +1,135 @@
+using UnityEngine.InputSystem.Interactions;
+
+////REVIEW: this goes beyond just actions; is there a better name? just InputPhase?
+
+////REVIEW: what about opening up phases completely to interactions and allow them to come up with whatever custom phases?
+
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// Trigger phase of an <see cref="InputAction"/>.
+    /// </summary>
+    /// <remarks>
+    /// Actions can be triggered in steps. For example, a <see cref="SlowTapInteraction">
+    /// 'slow tap'</see> will put an action into <see cref="Started"/> phase when a button
+    /// the action is bound to is pressed. At that point, however, the action still
+    /// has to wait for the expiration of a timer in order to make it a 'slow tap'. If
+    /// the button is release before the timer expires, the action will be <see cref="Canceled"/>
+    /// whereas if the button is held long enough, the action will be <see cref="Performed"/>.
+    /// </remarks>
+    /// <seealso cref="InputAction.phase"/>
+    /// <seealso cref="InputAction.CallbackContext.phase"/>
+    /// <seealso cref="InputAction.started"/>
+    /// <seealso cref="InputAction.performed"/>
+    /// <seealso cref="InputAction.canceled"/>
+    public enum InputActionPhase
+    {
+        /// <summary>
+        /// The action is not enabled.
+        /// </summary>
+        Disabled,
+
+        /// <summary>
+        /// The action is enabled and waiting for input on its associated controls.
+        ///
+        /// This is the phase that an action goes back to once it has been <see cref="Performed"/>
+        /// or <see cref="Canceled"/>.
+        /// </summary>
+        Waiting,
+
+        /// <summary>
+        /// An associated control has been actuated such that it may lead to the action
+        /// being triggered. Will lead to <see cref="InputAction.started"/> getting called.
+        ///
+        /// This phase will only be invoked if there are interactions on the respective control
+        /// binding. Without any interactions, an action will go straight from <see cref="Waiting"/>
+        /// into <see cref="Performed"/> and back into <see cref="Waiting"/> whenever an associated
+        /// control changes value.
+        ///
+        /// An example of an interaction that uses the <see cref="Started"/> phase is <see cref="SlowTapInteraction"/>.
+        /// When the button it is bound to is pressed, the associated action goes into the <see cref="Started"/>
+        /// phase. At this point, the interaction does not yet know whether the button press will result in just
+        /// a tap or will indeed result in slow tap. If the button is released before the time it takes to
+        /// recognize a slow tap, then the action will go to <see cref="Canceled"/> and then back to <see cref="Waiting"/>.
+        /// If, however, the button is held long enough for it to qualify as a slow tap, the action will progress
+        /// to <see cref="Performed"/> and then go back to <see cref="Waiting"/>.
+        ///
+        /// <see cref="Started"/> can be useful for UI feedback. For example, in a game where the weapon can be charged,
+        /// UI feedback can be initiated when the action is <see cref="Started"/>.
+        ///
+        /// <example>
+        /// <code>
+        /// fireAction.started +=
+        ///     ctx =>
+        ///     {
+        ///         if (ctx.interaction is SlowTapInteraction)
+        ///         {
+        ///             weaponCharging = true;
+        ///             weaponChargeStartTime = ctx.time;
+        ///         }
+        ///     }
+        /// fireAction.canceled +=
+        ///     ctx =>
+        ///     {
+        ///         weaponCharging = false;
+        ///     }
+        /// fireAction.performed +=
+        ///     ctx =>
+        ///     {
+        ///         Fire();
+        ///         weaponCharging = false;
+        ///     }
+        /// </code>
+        /// </example>
+        ///
+        /// By default, an action is started as soon as a control moves away from its default value. This is
+        /// the case for both <see cref="InputActionType.Button"/> actions (which, however, does not yet have to mean
+        /// that the button press threshold has been reached; see <see cref="InputSettings.defaultButtonPressPoint"/>)
+        /// and <see cref="InputActionType.Value"/> actions. <see cref="InputActionType.PassThrough"/> does not use
+        /// the <c>Started</c> phase and instead goes straight to <see cref="Performed"/>.
+        ///
+        /// For <see cref="InputActionType.Value"/> actions, <c>Started</c> will immediately be followed by <see cref="Performed"/>.
+        ///
+        /// Note that interactions (see <see cref="IInputInteraction"/>) can alter how an action does or does not progress through
+        /// the phases.
+        /// </summary>
+        Started,
+
+        /// <summary>
+        /// The action has been performed. Leads to <see cref="InputAction.performed"/> getting called.
+        ///
+        /// By default, a <see cref="InputActionType.Button"/> action performs when a control crosses the button
+        /// press threshold (see <see cref="InputSettings.defaultButtonPressPoint"/>), a <see cref="InputActionType.Value"/>
+        /// action performs on any value change that isn't the default value, and a <see cref="InputActionType.PassThrough"/>
+        /// action performs on any value change including going back to the default value.
+        ///
+        /// Note that interactions (see <see cref="IInputInteraction"/>) can alter how an action does or does not progress through
+        /// the phases.
+        ///
+        /// For a given action, finding out whether it was performed in the current frame can be done with <see cref="InputAction.WasPerformedThisFrame"/>.
+        ///
+        /// <example>
+        /// <code>
+        /// action.WasPerformedThisFrame();
+        /// </code>
+        /// </example>
+        /// </summary>
+        Performed,
+
+        /// <summary>
+        /// The action has stopped. Leads to <see cref="InputAction.canceled"/> getting called.
+        ///
+        /// By default, a <see cref="InputActionType.Button"/> action cancels when a control falls back below the button
+        /// press threshold (see <see cref="InputSettings.defaultButtonPressPoint"/>) and a <see cref="InputActionType.Value"/>
+        /// action cancels when a control moves back to its default value. A <see cref="InputActionType.PassThrough"/> action
+        /// does not generally cancel based on input on its controls.
+        ///
+        /// An action will also get canceled when it is disabled while in progress (see <see cref="InputAction.Disable"/>).
+        /// Also, when an <see cref="InputDevice"/> that is
+        ///
+        /// Note that interactions (see <see cref="IInputInteraction"/>) can alter how an action does or does not progress through
+        /// the phases.
+        /// </summary>
+        Canceled
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionPhase.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionProperty.cs

@@ -0,0 +1,176 @@
+using System;
+
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// A serializable property type that can either reference an action externally defined
+    /// in an <see cref="InputActionAsset"/> or define a new action directly on the property.
+    /// </summary>
+    /// <remarks>
+    /// This struct is meant to be used for serialized fields in <c>MonoBehaviour</c> and
+    /// <c>ScriptableObject</c> classes. It has a custom property drawer attached to it
+    /// that allows to switch between using the property as a reference and using it
+    /// to define an action in place.
+    ///
+    /// <example>
+    /// <code>
+    /// public class MyBehavior : MonoBehaviour
+    /// {
+    ///     // This can be edited in the inspector to either reference an existing
+    ///     // action or to define an action directly on the component.
+    ///     public InputActionProperty myAction;
+    /// }
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <seealso cref="InputAction"/>
+    /// <seealso cref="InputActionReference"/>
+    [Serializable]
+    public struct InputActionProperty : IEquatable<InputActionProperty>, IEquatable<InputAction>, IEquatable<InputActionReference>
+    {
+        /// <summary>
+        /// The effective action held on to by the property.
+        /// </summary>
+        /// <value>The effective action object contained in the property.</value>
+        /// <remarks>
+        /// This property will return <c>null</c> if the property is using a <see cref="reference"/> and
+        /// the referenced action cannot be found. Also, it will be <c>null</c> if the property
+        /// has been manually initialized with a <c>null</c> <see cref="InputAction"/> using
+        /// <see cref="InputActionProperty(InputAction)"/>.
+        /// </remarks>
+        public InputAction action => m_UseReference ? m_Reference != null ? m_Reference.action : null : m_Action;
+
+        /// <summary>
+        /// If the property is set to use a reference to the action, this property returns
+        /// the reference. Otherwise it returns <c>null</c>.
+        /// </summary>
+        /// <value>Reference to external input action, if defined.</value>
+        public InputActionReference reference => m_UseReference ? m_Reference : null;
+
+        /// <summary>
+        /// The serialized loose action created in code serialized with this property.
+        /// </summary>
+        /// <value>The serialized action field.</value>
+        internal InputAction serializedAction => m_Action;
+
+        /// <summary>
+        /// The serialized reference to an external action.
+        /// </summary>
+        /// <value>The serialized reference field.</value>
+        internal InputActionReference serializedReference => m_Reference;
+
+        /// <summary>
+        /// Initialize the property to contain the given action.
+        /// </summary>
+        /// <param name="action">An action.</param>
+        /// <remarks>
+        /// When the struct is serialized, it will serialize the given action as part of it.
+        /// The <see cref="reference"/> property will return <c>null</c>.
+        /// </remarks>
+        public InputActionProperty(InputAction action)
+        {
+            m_UseReference = false;
+            m_Action = action;
+            m_Reference = null;
+        }
+
+        /// <summary>
+        /// Initialize the property to use the given action reference.
+        /// </summary>
+        /// <param name="reference">Reference to an <see cref="InputAction"/>.</param>
+        /// <remarks>
+        /// When the struct is serialized, it will only serialize a reference to
+        /// the given <paramref name="reference"/> object.
+        /// </remarks>
+        public InputActionProperty(InputActionReference reference)
+        {
+            m_UseReference = true;
+            m_Action = null;
+            m_Reference = reference;
+        }
+
+        /// <summary>
+        /// Compare two action properties to see whether they refer to the same action.
+        /// </summary>
+        /// <param name="other">Another action property.</param>
+        /// <returns>True if both properties refer to the same action.</returns>
+        public bool Equals(InputActionProperty other)
+        {
+            return m_Reference == other.m_Reference &&
+                m_UseReference == other.m_UseReference &&
+                m_Action == other.m_Action;
+        }
+
+        /// <summary>
+        /// Check whether the property refers to the same action.
+        /// </summary>
+        /// <param name="other">An action.</param>
+        /// <returns>True if <see cref="action"/> is the same as <paramref name="other"/>.</returns>
+        public bool Equals(InputAction other)
+        {
+            return ReferenceEquals(action, other);
+        }
+
+        /// <summary>
+        /// Check whether the property references the same action.
+        /// </summary>
+        /// <param name="other">An action reference.</param>
+        /// <returns>True if the property and <paramref name="other"/> reference the same action.</returns>
+        public bool Equals(InputActionReference other)
+        {
+            return m_Reference == other;
+        }
+
+        /// <summary>
+        /// Check whether the given object is an InputActionProperty referencing the same action.
+        /// </summary>
+        /// <param name="obj">An object or <c>null</c>.</param>
+        /// <returns>True if the given <paramref name="obj"/> is an InputActionProperty equivalent to this one.</returns>
+        /// <seealso cref="Equals(InputActionProperty)"/>
+        public override bool Equals(object obj)
+        {
+            if (m_UseReference)
+                return Equals(obj as InputActionReference);
+            return Equals(obj as InputAction);
+        }
+
+        /// <summary>
+        /// Compute a hash code for the object.
+        /// </summary>
+        /// <returns>A hash code.</returns>
+        public override int GetHashCode()
+        {
+            if (m_UseReference)
+                return m_Reference != null ? m_Reference.GetHashCode() : 0;
+            return m_Action != null ? m_Action.GetHashCode() : 0;
+        }
+
+        /// <summary>
+        /// Compare the two properties for equivalence.
+        /// </summary>
+        /// <param name="left">The first property.</param>
+        /// <param name="right">The second property.</param>
+        /// <returns>True if the two action properties are equivalent.</returns>
+        /// <seealso cref="Equals(InputActionProperty)"/>
+        public static bool operator==(InputActionProperty left, InputActionProperty right)
+        {
+            return left.Equals(right);
+        }
+
+        /// <summary>
+        /// Compare the two properties for not being equivalent.
+        /// </summary>
+        /// <param name="left">The first property.</param>
+        /// <param name="right">The second property.</param>
+        /// <returns>True if the two action properties are not equivalent.</returns>
+        /// <seealso cref="Equals(InputActionProperty)"/>
+        public static bool operator!=(InputActionProperty left, InputActionProperty right)
+        {
+            return !left.Equals(right);
+        }
+
+        [SerializeField] private bool m_UseReference;
+        [SerializeField] private InputAction m_Action;
+        [SerializeField] private InputActionReference m_Reference;
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionProperty.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionReference.cs

@@ -0,0 +1,236 @@
+using System;
+using System.Linq;
+
+////REVIEW: Can we somehow make this a simple struct? The one problem we have is that we can't put struct instances as sub-assets into
+////        the import (i.e. InputActionImporter can't do AddObjectToAsset with them). However, maybe there's a way around that. The thing
+////        is that we really want to store the asset reference plus the action GUID on the *user* side, i.e. the referencing side. Right
+////        now, what happens is that InputActionImporter puts these objects along with the reference and GUID they contain in the
+////        *imported* object, i.e. right with the asset. This partially defeats the whole purpose of having these objects and it means
+////        that now the GUID doesn't really matter anymore. Rather, it's the file ID that now has to be stable.
+////
+////        If we always store the GUID and asset reference on the user side, we can put the serialized data *anywhere* and it'll remain
+////        save and proper no matter what we do in InputActionImporter.
+
+////REVIEW: should this throw if you try to assign an action that is not a singleton?
+
+////REVIEW: akin to this, also have an InputActionMapReference?
+
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// References a specific <see cref="InputAction"/> in an <see cref="InputActionMap"/>
+    /// stored inside an <see cref="InputActionAsset"/>.
+    /// </summary>
+    /// <remarks>
+    /// The difference to a plain reference directly to an <see cref="InputAction"/> object is
+    /// that an InputActionReference can be serialized without causing the referenced <see cref="InputAction"/>
+    /// to be serialized as well. The reference will remain intact even if the action or the map
+    /// that contains the action is renamed.
+    ///
+    /// References can be set up graphically in the editor by dropping individual actions from the project
+    /// browser onto a reference field.
+    /// </remarks>
+    /// <seealso cref="InputActionProperty"/>
+    /// <seealso cref="InputAction"/>
+    /// <seealso cref="InputActionAsset"/>
+    public class InputActionReference : ScriptableObject
+    {
+        /// <summary>
+        /// The asset that the referenced action is part of. Null if the reference
+        /// is not initialized or if the asset has been deleted.
+        /// </summary>
+        /// <value>InputActionAsset of the referenced action.</value>
+        public InputActionAsset asset => m_Asset;
+
+        /// <summary>
+        /// The action that the reference resolves to. Null if the action
+        /// cannot be found.
+        /// </summary>
+        /// <value>The action that reference points to.</value>
+        /// <remarks>
+        /// Actions are resolved on demand based on their internally stored IDs.
+        /// </remarks>
+        public InputAction action
+        {
+            get
+            {
+                if (m_Action == null)
+                {
+                    if (m_Asset == null)
+                        return null;
+
+                    m_Action = m_Asset.FindAction(new Guid(m_ActionId));
+                }
+
+                return m_Action;
+            }
+        }
+
+        /// <summary>
+        /// Initialize the reference to refer to the given action.
+        /// </summary>
+        /// <param name="action">An input action. Must be contained in an <see cref="InputActionMap"/>
+        /// that is itself contained in an <see cref="InputActionAsset"/>. Can be <c>null</c> in which
+        /// case the reference is reset to its default state which does not reference an action.</param>
+        /// <exception cref="InvalidOperationException"><paramref name="action"/> is not contained in an
+        /// <see cref="InputActionMap"/> that is itself contained in an <see cref="InputActionAsset"/>.</exception>
+        public void Set(InputAction action)
+        {
+            if (action == null)
+            {
+                m_Asset = default;
+                m_ActionId = default;
+                return;
+            }
+
+            var map = action.actionMap;
+            if (map == null || map.asset == null)
+                throw new InvalidOperationException(
+                    $"Action '{action}' must be part of an InputActionAsset in order to be able to create an InputActionReference for it");
+
+            SetInternal(map.asset, action);
+        }
+
+        /// <summary>
+        /// Look up an action in the given asset and initialize the reference to
+        /// point to it.
+        /// </summary>
+        /// <param name="asset">An .inputactions asset.</param>
+        /// <param name="mapName">Name of the <see cref="InputActionMap"/> in <paramref name="asset"/>
+        /// (see <see cref="InputActionAsset.actionMaps"/>). Case-insensitive.</param>
+        /// <param name="actionName">Name of the action in <paramref name="mapName"/>. Case-insensitive.</param>
+        /// <exception cref="ArgumentNullException"><paramref name="asset"/> is <c>null</c> -or-
+        /// <paramref name="mapName"/> is <c>null</c> or empty -or- <paramref name="actionName"/>
+        /// is <c>null</c> or empty.</exception>
+        /// <exception cref="ArgumentException">No action map called <paramref name="mapName"/> could
+        /// be found in <paramref name="asset"/> -or- no action called <paramref name="actionName"/>
+        /// could be found in the action map called <paramref name="mapName"/> in <paramref name="asset"/>.</exception>
+        public void Set(InputActionAsset asset, string mapName, string actionName)
+        {
+            if (asset == null)
+                throw new ArgumentNullException(nameof(asset));
+            if (string.IsNullOrEmpty(mapName))
+                throw new ArgumentNullException(nameof(mapName));
+            if (string.IsNullOrEmpty(actionName))
+                throw new ArgumentNullException(nameof(actionName));
+
+            var actionMap = asset.FindActionMap(mapName);
+            if (actionMap == null)
+                throw new ArgumentException($"No action map '{mapName}' in '{asset}'", nameof(mapName));
+
+            var action = actionMap.FindAction(actionName);
+            if (action == null)
+                throw new ArgumentException($"No action '{actionName}' in map '{mapName}' of asset '{asset}'",
+                    nameof(actionName));
+
+            SetInternal(asset, action);
+        }
+
+        private void SetInternal(InputActionAsset asset, InputAction action)
+        {
+            var actionMap = action.actionMap;
+            if (!asset.actionMaps.Contains(actionMap))
+                throw new ArgumentException(
+                    $"Action '{action}' is not contained in asset '{asset}'", nameof(action));
+
+            m_Asset = asset;
+            m_ActionId = action.id.ToString();
+            name = GetDisplayName(action);
+
+            ////REVIEW: should this dirty the asset if IDs had not been generated yet?
+        }
+
+        /// <summary>
+        /// Return a string representation of the reference useful for debugging.
+        /// </summary>
+        /// <returns>A string representation of the reference.</returns>
+        public override string ToString()
+        {
+            try
+            {
+                var action = this.action;
+                return $"{m_Asset.name}:{action.actionMap.name}/{action.name}";
+            }
+            catch
+            {
+                if (m_Asset != null)
+                    return $"{m_Asset.name}:{m_ActionId}";
+            }
+
+            return base.ToString();
+        }
+
+        internal static string GetDisplayName(InputAction action)
+        {
+            return !string.IsNullOrEmpty(action?.actionMap?.name) ? $"{action.actionMap?.name}/{action.name}" : action?.name;
+        }
+
+        /// <summary>
+        /// Return a string representation useful for showing in UI.
+        /// </summary>
+        internal string ToDisplayName()
+        {
+            return string.IsNullOrEmpty(name) ? GetDisplayName(action) : name;
+        }
+
+        /// <summary>
+        /// Convert an InputActionReference to the InputAction it points to.
+        /// </summary>
+        /// <param name="reference">An InputActionReference object. Can be null.</param>
+        /// <returns>The value of <see cref="action"/> from <paramref name="reference"/>. Can be null.</returns>
+        public static implicit operator InputAction(InputActionReference reference)
+        {
+            return reference?.action;
+        }
+
+        /// <summary>
+        /// Create a new InputActionReference object that references the given action.
+        /// </summary>
+        /// <param name="action">An input action. Must be contained in an <see cref="InputActionMap"/>
+        /// that is itself contained in an <see cref="InputActionAsset"/>. Can be <c>null</c> in which
+        /// case the reference is reset to its default state which does not reference an action.</param>
+        /// <returns>A new InputActionReference referencing <paramref name="action"/>.</returns>
+        public static InputActionReference Create(InputAction action)
+        {
+            if (action == null)
+                return null;
+            var reference = CreateInstance<InputActionReference>();
+            reference.Set(action);
+            return reference;
+        }
+
+        /// <summary>
+        /// Clears the cached <see cref="m_Action"/> field for all current <see cref="InputActionReference"/> objects.
+        /// </summary>
+        /// <remarks>
+        /// After calling this, the next call to <see cref="action"/> will retrieve a new <see cref="InputAction"/> reference from the existing <see cref="InputActionAsset"/> just as if
+        /// using it for the first time. The serialized <see cref="m_Asset"/> and <see cref="m_ActionId"/> fields are not touched and will continue to hold their current values.
+        ///
+        /// This method is used to clear the Action references when exiting PlayMode since those objects are no longer valid.
+        /// </remarks>
+        internal static void ResetCachedAction()
+        {
+            var allActionRefs = Resources.FindObjectsOfTypeAll(typeof(InputActionReference));
+            foreach (InputActionReference obj in allActionRefs)
+            {
+                obj.m_Action = null;
+            }
+        }
+
+        [SerializeField] internal InputActionAsset m_Asset;
+        // Can't serialize System.Guid and Unity's GUID is editor only so these
+        // go out as strings.
+        [SerializeField] internal string m_ActionId;
+
+        /// <summary>
+        /// The resolved, cached input action.
+        /// </summary>
+        [NonSerialized] private InputAction m_Action;
+
+        // Make annoying Microsoft code analyzer happy.
+        public InputAction ToInputAction()
+        {
+            return action;
+        }
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionReference.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionSetupExtensions.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionState.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionTrace.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionType.cs

@@ -0,0 +1,206 @@
+namespace UnityEngine.InputSystem
+{
+    /// <summary>
+    /// Determines the behavior with which an <see cref="InputAction"/> triggers.
+    /// </summary>
+    /// <remarks>
+    /// While all actions essentially function the same way, there are differences in how an action
+    /// will react to changes in values on the controls it is bound to.
+    ///
+    /// The most straightforward type of behavior is <see cref="PassThrough"/> which does not expect
+    /// any kind of value change pattern but simply triggers the action on every single value change.
+    /// A pass-through action will not use <see cref="InputAction.started"/> or
+    /// <see cref="InputAction.canceled"/> except on bindings that have an interaction added to them.
+    /// Pass-through actions are most useful for sourcing input from arbitrary many controls and
+    /// simply piping all input through without much processing on the side of the action.
+    ///
+    /// <example>
+    /// <code>
+    /// // An action that triggers every time any button on the gamepad is
+    /// // pressed or released.
+    /// var action = new InputAction(
+    ///     type: InputActionType.PassThrough,
+    ///     binding: "&lt;Gamepad&gt;/&lt;Button&gt;");
+    ///
+    /// action.performed +=
+    ///     ctx =>
+    ///     {
+    ///         var button = (ButtonControl)ctx.control;
+    ///         if (button.wasPressedThisFrame)
+    ///             Debug.Log($"Button {ctx.control} was pressed");
+    ///         else if (button.wasReleasedThisFrame)
+    ///             Debug.Log($"Button {ctx.control} was released");
+    ///         // NOTE: We may get calls here in which neither the if nor the else
+    ///         //       clause are true here. A button like the gamepad left and right
+    ///         //       triggers, for example, do not just have a binary on/off state
+    ///         //       but rather a [0..1] value range.
+    ///     };
+    ///
+    /// action.Enable();
+    /// </code>
+    /// </example>
+    ///
+    /// Note that pass-through actions do not perform any kind of disambiguation of input
+    /// which makes them great for just forwarding input from any connected controls but
+    /// makes them a poor choice when only one input should be generated from however
+    /// many connected controls there are. For more details, see <a
+    /// href="../manual/ActionBindings.html#conflicting-inputs">here</a>.
+    ///
+    /// The other two behavior types are <see cref="Button"/> and <see cref="Value"/>.
+    ///
+    /// A <see cref="Value"/> action starts (<see cref="InputAction.started"/>) as soon as its
+    /// input moves away from its default value. After that it immediately performs (<see cref="InputAction.performed"/>)
+    /// and every time the input changes value it performs again except if the input moves back
+    /// to the default value -- in which case the action cancels (<see cref="InputAction.canceled"/>).
+    ///
+    /// Also, unlike both <see cref="Button"/> and <see cref="PassThrough"/> actions, <see cref="Value"/>
+    /// actions perform what's called "initial state check" on the first input update after the action
+    /// was enabled. What this does is check controls bound to the action and if they are already actuated
+    /// (that is, at non-default value), the action will immediately be started and performed. What
+    /// this means in practice is that when a value action is bound to, say, the left stick on a
+    /// gamepad and the stick is already moved out of its resting position, then the action will
+    /// immediately trigger instead of first requiring the stick to be moved slightly.
+    ///
+    /// <see cref="Button"/> and <see cref="PassThrough"/> actions, on the other hand, perform
+    /// no such initial state check. For buttons, for example, this means that if a button is
+    /// already pressed when an action is enabled, it first has to be released and then
+    /// pressed again for the action to be triggered.
+    ///
+    /// <example>
+    /// <code>
+    /// // An action that starts when the left stick on the gamepad is actuated
+    /// // and stops when the stick is released.
+    /// var action = new InputAction(
+    ///     type: InputActionType.Value,
+    ///     binding: "&lt;Gamepad&gt;/leftStick");
+    ///
+    /// action.started +=
+    ///     ctx =>
+    ///     {
+    ///         Debug.Log("--- Stick Starts ---");
+    ///     };
+    /// action.performed +=
+    ///     ctx =>
+    ///     {
+    ///         Debug.Log("Stick Value: " + ctx.ReadValue&lt;Vector2D&gt;();
+    ///     };
+    /// action.canceled +=
+    ///     ctx =>
+    ///     {
+    ///         Debug.Log("# Stick Released");
+    ///     };
+    ///
+    /// action.Enable();
+    /// </code>
+    /// </example>
+    ///
+    /// A <see cref="Button"/> action essentially operates like a <see cref="Value"/> action except
+    /// that it does not perform an initial state check.
+    ///
+    /// One final noteworthy difference of both <see cref="Button"/> and <see cref="Value"/> compared
+    /// to <see cref="PassThrough"/> is that both of them perform what is referred to as "disambiguation"
+    /// when multiple actions are bound to the control. <see cref="PassThrough"/> does not care how
+    /// many controls are bound to the action -- it simply passes every input through as is, no matter
+    /// where it comes from.
+    ///
+    /// <see cref="Button"/> and <see cref="Value"/>, on the other hand, will treat input differently
+    /// if it is coming from several sources at the same time. Note that this can only happen when there
+    /// are multiple controls bound to a single actions -- either by a single binding resolving to
+    /// more than one control (e.g. <c>"*/{PrimaryAction}"</c>) or by multiple bindings all targeting
+    /// the same action and being active at the same time. If only a single control is bound to an
+    /// action, then the disambiguation code is automatically bypassed.
+    ///
+    /// Disambiguation works the following way: when an action has not yet been started, it will react
+    /// to the first input that has a non-default value. Once it receives such an input, it will start
+    /// tracking the source of that input. While the action is in-progress, if it receives input from
+    /// a source other than the control it is currently tracking, it will check whether the input has
+    /// a greater magnitude (see <see cref="InputControl.EvaluateMagnitude()"/>) than the control the
+    /// action is already tracking. If so, the action will switch from its current control to the control
+    /// with the stronger input.
+    ///
+    /// Note that this process does also works in reverse. When the control currently driving the action
+    /// lowers its value below that of another control that is also actuated and bound to the action,
+    /// the action will switch to that control.
+    ///
+    /// Put simply, a <see cref="Button"/> or <see cref="Value"/> action bound to multiple controls will
+    /// always track the control with the strongest input.
+    /// </remarks>
+    /// <seealso cref="InputAction.type"/>
+    public enum InputActionType
+    {
+        /// <summary>
+        /// An action that reads a single value from its connected sources. If multiple bindings
+        /// actuate at the same time, performs disambiguation (see <see
+        /// href="../manual/ActionBindings.html#conflicting-inputs"/>) to detect the highest value contributor
+        /// at any one time.
+        ///
+        /// A value action starts (<see cref="InputActionPhase.Started"/>) and then performs (<see cref="InputActionPhase.Performed"/>)
+        /// as soon as a bound control changes to a non-default value. For example, if an action is bound to <see cref="Gamepad.leftStick"/>
+        /// and the stick moves from (0,0) to (0.5,0.5), the action starts and performs.
+        ///
+        /// After being started, the action will perform on every value change that is not the default value. In the example here, if
+        /// the stick goes to (0.75,0.75) and then to (1,1), the action will perform twice.
+        ///
+        /// Finally, if the control value changes back to the default value, the action is canceled (<see cref="InputActionPhase.Canceled"/>).
+        /// Meaning that if the stick moves back to (0,0), <see cref="InputAction.canceled"/> will be triggered.
+        /// </summary>
+        Value,
+
+        /// <summary>
+        /// An action that acts as a trigger.
+        ///
+        /// A button action has a defined trigger point that corresponds to <see cref="InputActionPhase.Performed"/>.
+        /// After being performed, the action goes back to waiting state to await the next triggering.
+        ///
+        /// Note that a button action may still use <see cref="InputActionPhase.Started"/> and does not necessarily
+        /// trigger immediately on input. For example, if <see cref="Interactions.HoldInteraction"/> is used, the
+        /// action will start as soon as a bound button crosses its press threshold but will not trigger until the
+        /// button is held for the set hold duration (<see cref="Interactions.HoldInteraction.duration"/>).
+        ///
+        /// Irrespective of which type an action is set to, it is possible to find out whether it was or is considered
+        /// pressed and/or released using <see cref="InputAction.IsPressed"/>, <see cref="InputAction.WasPressedThisFrame"/>,
+        /// and <see cref="InputAction.WasReleasedThisFrame"/>.
+        ///
+        /// <example>
+        /// <code>
+        /// action.IsPressed();
+        /// action.WasPressedThisFrame();
+        /// action.WasReleasedThisFrame();
+        /// </code>
+        /// </example>
+        /// </summary>
+        Button,
+
+        /// <summary>
+        /// An action that has no specific type of behavior and instead acts as a simple pass-through for
+        /// any value change on any bound control. In effect, this turns an action from a single value producer into a mere
+        /// input "sink".
+        ///
+        /// This is in some ways similar to <see cref="Value"/>. However, there are two key differences.
+        ///
+        /// For one,  the action will not perform any disambiguation when bound to multiple controls concurrently.
+        /// This means that if, for example, the action is bound to both the left and the right stick on a <see cref="Gamepad"/>,
+        /// and the left stick goes to (0.5,0.5) and the right stick then goes to (0.25,0.25), the action will perform
+        /// twice yielding a value of (0.5,0.5) first and a value of (0.25, 0.25) next. This is different from <see cref="Value"/>
+        /// where upon actuation to (0.5,0.5), the left stick would get to drive the action and the actuation of the right
+        /// stick would be ignored as it does not exceed the magnitude of the actuation on the left stick.
+        ///
+        /// The second key difference is that only <see cref="InputActionPhase.Performed"/> is used and will get triggered
+        /// on every value change regardless of what the value is. This is different from <see cref="Value"/> where the
+        /// action will trigger <see cref="InputActionPhase.Started"/> when moving away from its default value and will
+        /// trigger <see cref="InputActionPhase.Canceled"/> when going back to the default value.
+        ///
+        /// Note that a pass-through action my still get cancelled and thus see <see cref="InputAction.canceled"/> getting called.
+        /// This happens when a factor other than input on a device causes an action in progress to be cancelled. An example
+        /// of this is when an action is disabled (see <see cref="InputAction.Disable"/>) or when focus is lost (see <see cref="InputSettings.backgroundBehavior"/>)
+        /// and a device connection to an action is reset (see <see cref="InputSystem.ResetDevice"/>).
+        ///
+        /// Also note that for a pass-through action, calling <see cref="InputAction.ReadValue{TValue}"/> is often not
+        /// very useful as it will only return the value of the very last control that fed into the action. For pass-through
+        /// actions, it is usually best to listen to <see cref="InputAction.performed"/> in order to be notified about every
+        /// single value change. Where this is not necessary, it is generally better to employ a <see cref="Value"/> action
+        /// instead.
+        /// </summary>
+        PassThrough,
+    }
+}

My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionType.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputBinding.cs.meta

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My project/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputBindingComposite.cs

@@ -0,0 +1,366 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using Unity.Collections.LowLevel.Unsafe;
+using UnityEngine.InputSystem.Layouts;
+using UnityEngine.InputSystem.Utilities;
+using UnityEngine.Scripting;
+
+////TODO: support nested composites
+
+////REVIEW: composites probably need a reset method, too (like interactions), so that they can be stateful
+
+////REVIEW: isn't this about arbitrary value processing? can we open this up more and make it
+////        not just be about composing multiple bindings?
+
+////REVIEW: when we get blittable type constraints, we can probably do away with the pointer-based ReadValue version
+
+namespace UnityEngine.InputSystem
+{
+    ////TODO: clarify whether this can have state or not
+    /// <summary>
+    /// A binding that synthesizes a value from from several component bindings.
+    /// </summary>
+    /// <remarks>
+    /// This is the base class for composite bindings. See <see cref="InputBindingComposite{TValue}"/>
+    /// for more details about composites and for how to define custom composites.
+    /// </remarks>
+    /// <seealso cref="InputSystem.RegisterBindingComposite{T}"/>
+    /// <seealso cref="InputActionRebindingExtensions.GetParameterValue(InputAction,string,InputBinding)"/>
+    /// <seealso cref="InputActionRebindingExtensions.ApplyParameterOverride(InputActionMap,string,PrimitiveValue,InputBinding)"/>
+    /// <seealso cref="InputBinding.isComposite"/>
+    public abstract class InputBindingComposite
+    {
+        /// <summary>
+        /// The type of value returned by the composite.
+        /// </summary>
+        /// <value>Type of value returned by the composite.</value>
+        /// <remarks>
+        /// Just like each <see cref="InputControl"/> has a specific type of value it
+        /// will return, each composite has a specific type of value it will return.
+        /// This is usually implicitly defined by the type parameter of <see
+        /// cref="InputBindingComposite{TValue}"/>.
+        /// </remarks>
+        /// <seealso cref="InputControl.valueType"/>
+        /// <seealso cref="InputAction.CallbackContext.valueType"/>
+        public abstract Type valueType { get; }
+
+        /// <summary>
+        /// Size of a value read by <see cref="ReadValue"/>.
+        /// </summary>
+        /// <value>Size of values stored in memory buffers by <see cref="ReadValue"/>.</value>
+        /// <remarks>
+        /// This is usually implicitly defined by the size of values derived
+        /// from the type argument to <see cref="InputBindingComposite{TValue}"/>. E.g.
+        /// if the type argument is <c>Vector2</c>, this property will be 8.
+        /// </remarks>
+        /// <seealso cref="InputControl.valueSizeInBytes"/>
+        /// <seealso cref="InputAction.CallbackContext.valueSizeInBytes"/>
+        public abstract int valueSizeInBytes { get; }
+
+        /// <summary>
+        /// Read a value from the composite without having to know the value type (unlike
+        /// <see cref="InputBindingComposite{TValue}.ReadValue(ref InputBindingCompositeContext)"/> and
+        /// without allocating GC heap memory (unlike <see cref="ReadValueAsObject"/>).
+        /// </summary>
+        /// <param name="context">Callback context for the binding composite. Use this
+        /// to access the values supplied by part bindings.</param>
+        /// <param name="buffer">Buffer that receives the value read for the composite.</param>
+        /// <param name="bufferSize">Size of the buffer allocated at <paramref name="buffer"/>.</param>
+        /// <exception cref="ArgumentException"><paramref name="bufferSize"/> is smaller than
+        /// <see cref="valueSizeInBytes"/>.</exception>
+        /// <exception cref="ArgumentNullException"><paramref name="buffer"/> is <c>null</c>.</exception>
+        /// <remarks>
+        /// This API will be used if someone calls <see cref="InputAction.CallbackContext.ReadValue(void*,int)"/>
+        /// with the action leading to the composite.
+        ///
+        /// By deriving from <see cref="InputBindingComposite{TValue}"/>, this will automatically
+        /// be implemented for you.
+        /// </remarks>
+        /// <seealso cref="InputAction.CallbackContext.ReadValue"/>
+        public abstract unsafe void ReadValue(ref InputBindingCompositeContext context, void* buffer, int bufferSize);
+
+        /// <summary>
+        /// Read the value of the composite as a boxed object. This allows reading the value
+        /// without having to know the value type and without having to deal with raw byte buffers.
+        /// </summary>
+        /// <param name="context">Callback context for the binding composite. Use this
+        /// to access the values supplied by part bindings.</param>
+        /// <returns>The current value of the composite according to the state passed in through
+        /// <paramref name="context"/>.</returns>
+        /// <remarks>
+        /// This API will be used if someone calls <see cref="InputAction.CallbackContext.ReadValueAsObject"/>
+        /// with the action leading to the composite.
+        ///
+        /// By deriving from <see cref="InputBindingComposite{TValue}"/>, this will automatically
+        /// be implemented for you.
+        /// </remarks>
+        public abstract object ReadValueAsObject(ref InputBindingCompositeContext context);
+
+        /// <summary>
+        /// Determine the current level of actuation of the composite.
+        /// </summary>
+        /// <param name="context">Callback context for the binding composite. Use this
+        /// to access the values supplied by part bindings.</param>
+        /// <returns></returns>
+        /// <remarks>
+        /// This method by default returns -1, meaning that the composite does not support
+        /// magnitudes. You can override the method to add support for magnitudes.
+        ///
+        /// See <see cref="InputControl.EvaluateMagnitude()"/> for details of how magnitudes
+        /// work.
+        /// </remarks>
+        /// <seealso cref="InputControl.EvaluateMagnitude()"/>
+        public virtual float EvaluateMagnitude(ref InputBindingCompositeContext context)
+        {
+            return -1;
+        }
+
+        /// <summary>
+        /// Called after binding resolution for an <see cref="InputActionMap"/> is complete.
+        /// </summary>
+        /// <remarks>
+        /// Some composites do not have predetermine value types. Two examples of this are
+        /// <see cref="Composites.OneModifierComposite"/> and <see cref="Composites.TwoModifiersComposite"/>, which
+        /// both have a <c>"binding"</c> part that can be bound to arbitrary controls. This means that the
+        /// value type of these bindings can only be determined at runtime.
+        ///
+        /// Overriding this method allows accessing the actual controls bound to each part
+        /// at runtime.
+        ///
+        /// <example>
+        /// <code>
+        /// [InputControl] public int binding;
+        ///
+        /// protected override void FinishSetup(ref InputBindingContext context)
+        /// {
+        ///     // Get all controls bound to the 'binding' part.
+        ///     var controls = context.controls
+        ///         .Where(x => x.part == binding)
+        ///         .Select(x => x.control);
+        /// }
+        /// </code>
+        /// </example>
+        /// </remarks>
+        protected virtual void FinishSetup(ref InputBindingCompositeContext context)
+        {
+        }
+
+        // Avoid having to expose internal modifier.
+        internal void CallFinishSetup(ref InputBindingCompositeContext context)
+        {
+            FinishSetup(ref context);
+        }
+
+        internal static TypeTable s_Composites;
+
+        internal static Type GetValueType(string composite)
+        {
+            if (string.IsNullOrEmpty(composite))
+                throw new ArgumentNullException(nameof(composite));
+
+            var compositeType = s_Composites.LookupTypeRegistration(composite);
+            if (compositeType == null)
+                return null;
+
+            return TypeHelpers.GetGenericTypeArgumentFromHierarchy(compositeType, typeof(InputBindingComposite<>), 0);
+        }
+
+        /// <summary>
+        /// Return the name of the control layout that is expected for the given part (e.g. "Up") on the given
+        /// composite (e.g. "Dpad").
+        /// </summary>
+        /// <param name="composite">Registration name of the composite.</param>
+        /// <param name="part">Name of the part.</param>
+        /// <returns>The layout name (such as "Button") expected for the given part on the composite or null if
+        /// there is no composite with the given name or no part on the composite with the given name.</returns>
+        /// <remarks>
+        /// Expected control layouts can be set on composite parts by setting the <see cref="InputControlAttribute.layout"/>
+        /// property on them.
+        /// </remarks>
+        /// <example>
+        /// <code>
+        /// InputBindingComposite.GetExpectedControlLayoutName("Dpad", "Up") // Returns "Button"
+        ///
+        /// // This is how Dpad communicates that:
+        /// [InputControl(layout = "Button")] public int up;
+        /// </code>
+        /// </example>
+        public static string GetExpectedControlLayoutName(string composite, string part)
+        {
+            if (string.IsNullOrEmpty(composite))
+                throw new ArgumentNullException(nameof(composite));
+            if (string.IsNullOrEmpty(part))
+                throw new ArgumentNullException(nameof(part));
+
+            var compositeType = s_Composites.LookupTypeRegistration(composite);
+            if (compositeType == null)
+                return null;
+
+            ////TODO: allow it being properties instead of just fields
+            var field = compositeType.GetField(part,
+                BindingFlags.Instance | BindingFlags.IgnoreCase | BindingFlags.Public);
+            if (field == null)
+                return null;
+
+            var attribute = field.GetCustomAttribute<InputControlAttribute>(false);
+            return attribute?.layout;
+        }
+
+        internal static IEnumerable<string> GetPartNames(string composite)
+        {
+            if (string.IsNullOrEmpty(composite))
+                throw new ArgumentNullException(nameof(composite));
+
+            var compositeType = s_Composites.LookupTypeRegistration(composite);
+            if (compositeType == null)
+                yield break;
+
+            foreach (var field in compositeType.GetFields(BindingFlags.Instance | BindingFlags.Public))
+            {
+                var controlAttribute = field.GetCustomAttribute<InputControlAttribute>();
+                if (controlAttribute != null)
+                    yield return field.Name;
+            }
+        }
+
+        internal static string GetDisplayFormatString(string composite)
+        {
+            if (string.IsNullOrEmpty(composite))
+                throw new ArgumentNullException(nameof(composite));
+
+            var compositeType = s_Composites.LookupTypeRegistration(composite);
+            if (compositeType == null)
+                return null;
+
+            var displayFormatAttribute = compositeType.GetCustomAttribute<DisplayStringFormatAttribute>();
+            if (displayFormatAttribute == null)
+                return null;
+
+            return displayFormatAttribute.formatString;
+        }
+    }
+
+    /// <summary>
+    /// A binding composite arranges several bindings such that they form a "virtual control".
+    /// </summary>
+    /// <typeparam name="TValue">Type of value returned by the composite. This must be a "blittable"
+    /// type, that is, a type whose values can simply be copied around.</typeparam>
+    /// <remarks>
+    /// Composite bindings are a special type of <see cref="InputBinding"/>. Whereas normally
+    /// an input binding simply references a set of controls and returns whatever input values are
+    /// generated by those controls, a composite binding sources input from several controls and
+    /// derives a new value from that.
+    ///
+    /// A good example for that is a classic WASD keyboard binding:
+    ///
+    /// <example>
+    /// <code>
+    /// var moveAction = new InputAction(name: "move");
+    /// moveAction.AddCompositeBinding("Vector2")
+    ///     .With("Up", "&lt;Keyboard&gt;/w")
+    ///     .With("Down", "&lt;Keyboard&gt;/s")
+    ///     .With("Left", "&lt;Keyboard&gt;/a")
+    ///     .With("Right", "&lt;Keyboard&gt;/d")
+    /// </code>
+    /// </example>
+    ///
+    /// Here, each direction is represented by a separate binding. "Up" is bound to "W", "Down"
+    /// is bound to "S", and so on. Each direction individually returns a 0 or 1 depending
+    /// on whether it is pressed or not.
+    ///
+    /// However, as a composite, the binding to the "move" action returns a combined <c>Vector2</c>
+    /// that is computed from the state of each of the directional controls. This is what composites
+    /// do. They take inputs from their "parts" to derive an input for the binding as a whole.
+    ///
+    /// Note that the properties and methods defined in <see cref="InputBindingComposite"/> and this
+    /// class will generally be called internally by the input system and are not generally meant
+    /// to be called directly from user land.
+    ///
+    /// The set of composites available in the system is extensible. While some composites are
+    /// such as <see cref="Composites.Vector2Composite"/> and <see cref="Composites.ButtonWithOneModifier"/>
+    /// are available out of the box, new composites can be implemented by anyone and simply be autodiscover
+    /// or manually registered with <see cref="InputSystem.RegisterBindingComposite{T}"/>.
+    ///
+    /// See the "Custom Composite" sample (can be installed from package manager UI) for a detailed example
+    /// of how to create a custom composite.
+    /// </remarks>
+    /// <seealso cref="InputSystem.RegisterBindingComposite{T}"/>
+    public abstract class InputBindingComposite<TValue> : InputBindingComposite
+        where TValue : struct
+    {
+        /// <summary>
+        /// The type of value returned by the composite, i.e. <c>typeof(TValue)</c>.
+        /// </summary>
+        /// <value>Returns <c>typeof(TValue)</c>.</value>
+        public override Type valueType => typeof(TValue);
+
+        /// <summary>
+        /// The size of values returned by the composite, i.e. <c>sizeof(TValue)</c>.
+        /// </summary>
+        /// <value>Returns <c>sizeof(TValue)</c>.</value>
+        public override int valueSizeInBytes => UnsafeUtility.SizeOf<TValue>();
+
+        /// <summary>
+        /// Read a value for the composite given the supplied context.
+        /// </summary>
+        /// <param name="context">Callback context for the binding composite. Use this
+        /// to access the values supplied by part bindings.</param>
+        /// <returns>The current value of the composite according to the state made
+        /// accessible through <paramref name="context"/>.</returns>
+        /// <remarks>
+        /// This is the main method to implement in custom composites.
+        ///
+        /// <example>
+        /// <code>
+        /// public class CustomComposite : InputBindingComposite&lt;float&gt;
+        /// {
+        ///     [InputControl(layout = "Button")]
+        ///     public int button;
+        ///
+        ///     public float scaleFactor = 1;
+        ///
+        ///     public override float ReadValue(ref InputBindingComposite context)
+        ///     {
+        ///         return context.ReadValue&lt;float&gt;(button) * scaleFactor;
+        ///     }
+        /// }
+        /// </code>
+        /// </example>
+        ///
+        /// The other method to consider overriding is <see cref="InputBindingComposite.EvaluateMagnitude"/>.
+        /// </remarks>
+        /// <seealso cref="InputAction.ReadValue{TValue}"/>
+        /// <seealso cref="InputAction.CallbackContext.ReadValue{TValue}"/>
+        public abstract TValue ReadValue(ref InputBindingCompositeContext context);
+
+        /// <inheritdoc />
+        public override unsafe void ReadValue(ref InputBindingCompositeContext context, void* buffer, int bufferSize)
+        {
+            if (buffer == null)
+                throw new ArgumentNullException(nameof(buffer));
+
+            var valueSize = UnsafeUtility.SizeOf<TValue>();
+            if (bufferSize < valueSize)
+                throw new ArgumentException(
+                    $"Expected buffer of at least {UnsafeUtility.SizeOf<TValue>()} bytes but got buffer of only {bufferSize} bytes instead",
+                    nameof(bufferSize));
+
+            var value = ReadValue(ref context);
+            var valuePtr = UnsafeUtility.AddressOf(ref value);
+
+            UnsafeUtility.MemCpy(buffer, valuePtr, valueSize);
+        }
+
+        /// <inheritdoc />
+        public override unsafe object ReadValueAsObject(ref InputBindingCompositeContext context)
+        {
+            var value = default(TValue);
+            var valuePtr = UnsafeUtility.AddressOf(ref value);
+
+            ReadValue(ref context, valuePtr, UnsafeUtility.SizeOf<TValue>());
+
+            return value;
+        }
+    }
+}

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