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- using System;
- using System.Runtime.InteropServices;
- using Unity.Collections;
- using Unity.Collections.LowLevel.Unsafe;
- using UnityEngine.InputSystem.Utilities;
- namespace UnityEngine.InputSystem.LowLevel
- {
- /// <summary>
- /// Partial state update for an input device.
- /// </summary>
- /// <remarks>
- /// Avoids having to send a full state memory snapshot when only a small
- /// part of the state has changed.
- /// </remarks>
- [StructLayout(LayoutKind.Explicit, Pack = 1, Size = InputEvent.kBaseEventSize + 9)]
- public unsafe struct DeltaStateEvent : IInputEventTypeInfo
- {
- public const int Type = 0x444C5441; // 'DLTA'
- [FieldOffset(0)]
- public InputEvent baseEvent;
- [FieldOffset(InputEvent.kBaseEventSize)]
- public FourCC stateFormat;
- [FieldOffset(InputEvent.kBaseEventSize + 4)]
- public uint stateOffset;
- [FieldOffset(InputEvent.kBaseEventSize + 8)]
- internal fixed byte stateData[1]; // Variable-sized.
- public uint deltaStateSizeInBytes => baseEvent.sizeInBytes - (InputEvent.kBaseEventSize + 8);
- public void* deltaState
- {
- get
- {
- fixed(byte* data = stateData)
- {
- return data;
- }
- }
- }
- public FourCC typeStatic => Type;
- public InputEventPtr ToEventPtr()
- {
- fixed(DeltaStateEvent * ptr = &this)
- {
- return new InputEventPtr((InputEvent*)ptr);
- }
- }
- public static DeltaStateEvent* From(InputEventPtr ptr)
- {
- if (!ptr.valid)
- throw new ArgumentNullException(nameof(ptr));
- if (!ptr.IsA<DeltaStateEvent>())
- throw new InvalidCastException($"Cannot cast event with type '{ptr.type}' into DeltaStateEvent");
- return (DeltaStateEvent*)ptr.data;
- }
- public static NativeArray<byte> From(InputControl control, out InputEventPtr eventPtr, Allocator allocator = Allocator.Temp)
- {
- if (control == null)
- throw new ArgumentNullException(nameof(control));
- var device = control.device;
- if (!device.added)
- throw new ArgumentException($"Device for control '{control}' has not been added to system",
- nameof(control));
- ref var deviceStateBlock = ref device.m_StateBlock;
- ref var controlStateBlock = ref control.m_StateBlock;
- var stateFormat = deviceStateBlock.format; // The event is sent against the *device* so that's the state format we use.
- var stateSize = controlStateBlock.alignedSizeInBytes;
- // Bit offset does not have to be in the first byte. We grab the entire bitfield here.
- stateSize += controlStateBlock.bitOffset / 8;
- var stateOffset = controlStateBlock.byteOffset;
- var statePtr = (byte*)control.currentStatePtr + (int)stateOffset;
- var eventSize = InputEvent.kBaseEventSize + sizeof(int) * 2 + stateSize;
- var buffer = new NativeArray<byte>((int)eventSize, allocator);
- var stateEventPtr = (DeltaStateEvent*)buffer.GetUnsafePtr();
- stateEventPtr->baseEvent = new InputEvent(Type, (int)eventSize, device.deviceId, InputRuntime.s_Instance.currentTime);
- stateEventPtr->stateFormat = stateFormat;
- stateEventPtr->stateOffset = controlStateBlock.byteOffset - deviceStateBlock.byteOffset; // Make offset relative to device.
- UnsafeUtility.MemCpy(stateEventPtr->deltaState, statePtr, stateSize);
- eventPtr = stateEventPtr->ToEventPtr();
- return buffer;
- }
- }
- }
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