281 lines
12 KiB
C#
281 lines
12 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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using Unity.Collections.LowLevel.Unsafe;
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using UnityEngine.InputSystem.Utilities;
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using UnityEngineInternal.Input;
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////REVIEW: can we get rid of the timestamp offsetting in the player and leave that complication for the editor only?
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namespace UnityEngine.InputSystem.LowLevel
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{
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/// <summary>
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/// A chunk of memory signaling a data transfer in the input system.
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/// </summary>
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/// <remarks>
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/// Input events are raw memory buffers akin to a byte array. For most uses of the input
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/// system, it is not necessary to be aware of the event stream in the background. Events
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/// are written to the internal event buffer by producers -- usually by the platform-specific
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/// backends sitting in the Unity runtime. Once per fixed or dynamic update (depending on
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/// what <see cref="InputSettings.updateMode"/> is set to), the input system then goes and
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/// flushes out the internal event buffer to process pending events.
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///
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/// Events may signal general device-related occurrences (such as <see cref="DeviceConfigurationEvent"/>
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/// or <see cref="DeviceRemoveEvent"/>) or they may signal input activity. The latter kind of
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/// event is called "state events". In particular, these events are either <see cref="StateEvent"/>,
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/// only.
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///
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/// Events are solely focused on input. To effect output on an input device (e.g. haptics
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/// effects), "commands" (see <see cref="InputDeviceCommand"/>) are used.
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///
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/// Event processing can be listened to using <see cref="InputSystem.onEvent"/>. This callback
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/// will get triggered for each event as it is processed by the input system.
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///
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/// Note that there is no "routing" mechanism for events, i.e. no mechanism by which the input
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/// system looks for a handler for a specific event. Instead, events represent low-level activity
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/// that the input system directly integrates into the state of its <see cref="InputDevice"/>
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/// instances.
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///
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/// Each type of event is distinguished by its own <see cref="FourCC"/> type tag. The tag can
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/// be queried from the <see cref="type"/> property.
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///
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/// Each event will receive a unique ID when queued to the internal event buffer. The ID can
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/// be queried using the <see cref="eventId"/> property. Over the lifetime of the input system,
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/// no two events will receive the same ID. If you repeatedly queue an event from the same
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/// memory buffer, each individual call of <see cref="InputSystem.QueueEvent"/> will result in
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/// its own unique event ID.
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///
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/// All events are device-specific meaning that <see cref="deviceId"/> will always reference
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/// some device (which, however, may or may not translate to an <see cref="InputDevice"/>; that
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/// part depends on whether the input system was able to create an <see cref="InputDevice"/>
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/// based on the information received from the backend).
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/// </remarks>
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/// <seealso cref="InputEventPtr"/>
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// NOTE: This has to be layout compatible with native events.
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[StructLayout(LayoutKind.Explicit, Size = kBaseEventSize, Pack = 1)]
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public struct InputEvent
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{
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private const uint kHandledMask = 0x80000000;
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private const uint kIdMask = 0x7FFFFFFF;
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internal const int kBaseEventSize = NativeInputEvent.structSize;
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/// <summary>
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/// Default, invalid value for <see cref="eventId"/>. Upon being queued with
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/// <see cref="InputSystem.QueueEvent"/>, no event will receive this ID.
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/// </summary>
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public const int InvalidEventId = 0;
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internal const int kAlignment = 4;
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[FieldOffset(0)]
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private NativeInputEvent m_Event;
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/// <summary>
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/// Type code for the event.
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/// </summary>
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/// <remarks>
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/// Each type of event has its own unique FourCC tag. For example, state events (see <see cref="StateEvent"/>)
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/// are tagged with "STAT". The type tag for a specific type of event can be queried from its <c>Type</c>
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/// property (for example, <see cref="StateEvent.Type"/>).
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///
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/// To check whether an event has a specific type tag, you can use <see cref="InputEventPtr.IsA{T}"/>.
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/// </remarks>
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public FourCC type
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{
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get => new FourCC((int)m_Event.type);
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set => m_Event.type = (NativeInputEventType)(int)value;
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}
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/// <summary>
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/// Total size of the event in bytes.
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/// </summary>
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/// <value>Size of the event in bytes.</value>
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/// <remarks>
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/// Events are variable-size structs. This field denotes the total size of the event
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/// as stored in memory. This includes the full size of this struct and not just the
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/// "payload" of the event.
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///
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/// <example>
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/// <code>
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/// // Store event in private buffer:
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/// unsafe byte[] CopyEventData(InputEventPtr eventPtr)
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/// {
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/// var sizeInBytes = eventPtr.sizeInBytes;
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/// var buffer = new byte[sizeInBytes];
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/// fixed (byte* bufferPtr = buffer)
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/// {
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/// UnsafeUtility.MemCpy(new IntPtr(bufferPtr), eventPtr.data, sizeInBytes);
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/// }
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/// return buffer;
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/// }
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/// </code>
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/// </example>
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///
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/// The maximum supported size of events is <c>ushort.MaxValue</c>, i.e. events cannot
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/// be larger than 64KB.
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/// </remarks>
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/// <exception cref="ArgumentException"><paramref name="value"/> exceeds <c>ushort.MaxValue</c>.</exception>
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public uint sizeInBytes
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{
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get => m_Event.sizeInBytes;
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set
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{
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if (value > ushort.MaxValue)
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throw new ArgumentException("Maximum event size is " + ushort.MaxValue, nameof(value));
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m_Event.sizeInBytes = (ushort)value;
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}
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}
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/// <summary>
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/// Unique serial ID of the event.
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/// </summary>
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/// <remarks>
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/// Events are assigned running IDs when they are put on an event queue (see
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/// <see cref="InputSystem.QueueEvent"/>).
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/// </remarks>
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/// <seealso cref="InvalidEventId"/>
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public int eventId
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{
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get => (int)(m_Event.eventId & kIdMask);
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set => m_Event.eventId = value | (int)(m_Event.eventId & ~kIdMask);
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}
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/// <summary>
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/// ID of the device that the event is for.
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/// </summary>
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/// <remarks>
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/// Device IDs are allocated by the <see cref="IInputRuntime">runtime</see>. No two devices
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/// will receive the same ID over an application lifecycle regardless of whether the devices
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/// existed at the same time or not.
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/// </remarks>
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/// <seealso cref="InputDevice.deviceId"/>
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/// <seealso cref="InputSystem.GetDeviceById"/>
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/// <seealso cref="InputDevice.InvalidDeviceId"/>
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public int deviceId
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{
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get => m_Event.deviceId;
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set => m_Event.deviceId = (ushort)value;
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}
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/// <summary>
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/// Time that the event was generated at.
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/// </summary>
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/// <remarks>
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/// Times are in seconds and progress linearly in real-time. The timeline is the
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/// same as for <see cref="Time.realtimeSinceStartup"/>.
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///
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/// Note that this implies that event times will reset in the editor every time you
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/// go into play mode. In effect, this can result in events appearing with negative
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/// timestamps (i.e. the event was generated before the current zero point for
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/// <see cref="Time.realtimeSinceStartup"/>).
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/// </remarks>
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public double time
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{
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get => m_Event.time - InputRuntime.s_CurrentTimeOffsetToRealtimeSinceStartup;
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set => m_Event.time = value + InputRuntime.s_CurrentTimeOffsetToRealtimeSinceStartup;
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}
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/// <summary>
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/// This is the raw input timestamp without the offset to <see cref="Time.realtimeSinceStartup"/>.
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/// </summary>
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/// <remarks>
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/// Internally, we always store all timestamps in "input time" which is relative to the native
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/// function GetTimeSinceStartup(). <see cref="IInputRuntime.currentTime"/> yields the current
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/// time on this timeline.
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/// </remarks>
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internal double internalTime
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{
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get => m_Event.time;
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set => m_Event.time = value;
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}
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////FIXME: this API isn't consistent; time seems to be internalTime whereas time property is external time
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public InputEvent(FourCC type, int sizeInBytes, int deviceId, double time = -1)
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{
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if (time < 0)
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time = InputRuntime.s_Instance.currentTime;
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m_Event.type = (NativeInputEventType)(int)type;
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m_Event.sizeInBytes = (ushort)sizeInBytes;
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m_Event.deviceId = (ushort)deviceId;
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m_Event.time = time;
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m_Event.eventId = InvalidEventId;
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}
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// We internally use bits inside m_EventId as flags. IDs are linearly counted up by the
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// native input system starting at 1 so we have plenty room.
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// NOTE: The native system assigns IDs when events are queued so if our handled flag
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// will implicitly get overwritten. Having events go back to unhandled state
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// when they go on the queue makes sense in itself, though, so this is fine.
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public bool handled
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{
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get => (m_Event.eventId & kHandledMask) == kHandledMask;
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set
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{
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if (value)
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m_Event.eventId = (int)(m_Event.eventId | kHandledMask);
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else
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m_Event.eventId = (int)(m_Event.eventId & ~kHandledMask);
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}
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}
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public override string ToString()
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{
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return $"id={eventId} type={type} device={deviceId} size={sizeInBytes} time={time}";
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}
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/// <summary>
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/// Get the next event after the given one.
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/// </summary>
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/// <param name="currentPtr">A valid event pointer.</param>
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/// <returns>Pointer to the next event in memory.</returns>
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/// <remarks>
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/// This method applies no checks and must only be called if there is an event following the
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/// given one. Also, the size of the given event must be 100% as the method will simply
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/// take the size and advance the given pointer by it (and aligning it to <see cref="kAlignment"/>).
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/// </remarks>
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/// <seealso cref="GetNextInMemoryChecked"/>
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internal static unsafe InputEvent* GetNextInMemory(InputEvent* currentPtr)
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{
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Debug.Assert(currentPtr != null, "Event pointer must not be NULL");
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var alignedSizeInBytes = currentPtr->sizeInBytes.AlignToMultipleOf(kAlignment);
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return (InputEvent*)((byte*)currentPtr + alignedSizeInBytes);
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}
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/// <summary>
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/// Get the next event after the given one. Throw if that would point to invalid memory as indicated
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/// by the given memory buffer.
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/// </summary>
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/// <param name="currentPtr">A valid event pointer to an event inside <paramref name="buffer"/>.</param>
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/// <param name="buffer">Event buffer in which to advance to the next event.</param>
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/// <returns>Pointer to the next event.</returns>
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/// <exception cref="InvalidOperationException">There are no more events in the given buffer.</exception>
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internal static unsafe InputEvent* GetNextInMemoryChecked(InputEvent* currentPtr, ref InputEventBuffer buffer)
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{
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Debug.Assert(currentPtr != null, "Event pointer must not be NULL");
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var alignedSizeInBytes = currentPtr->sizeInBytes.AlignToMultipleOf(kAlignment);
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var nextPtr = (InputEvent*)((byte*)currentPtr + alignedSizeInBytes);
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if (!buffer.Contains(nextPtr))
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throw new InvalidOperationException(
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$"Event '{new InputEventPtr(currentPtr)}' is last event in given buffer with size {buffer.sizeInBytes}");
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return nextPtr;
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}
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public static unsafe bool Equals(InputEvent* first, InputEvent* second)
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{
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if (first == second)
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return true;
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if (first == null || second == null)
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return false;
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if (first->m_Event.sizeInBytes != second->m_Event.sizeInBytes)
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return false;
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return UnsafeUtility.MemCmp(first, second, first->m_Event.sizeInBytes) == 0;
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}
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}
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}
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