84 lines
2.9 KiB
C#
84 lines
2.9 KiB
C#
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using System;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using Unity.Collections.LowLevel.Unsafe;
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namespace Unity.Burst
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{
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/// <summary>
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/// Base interface for a function pointer.
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/// </summary>
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public interface IFunctionPointer
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{
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/// <summary>
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/// Converts a pointer to a function pointer.
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/// </summary>
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/// <param name="ptr">The native pointer.</param>
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/// <returns>An instance of this interface.</returns>
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[Obsolete("This method will be removed in a future version of Burst")]
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IFunctionPointer FromIntPtr(IntPtr ptr);
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}
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/// <summary>
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/// A function pointer that can be used from a Burst Job or from regular C#.
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/// It needs to be compiled through <see cref="BurstCompiler.CompileFunctionPointer{T}"/>
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/// </summary>
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/// <typeparam name="T">Type of the delegate of this function pointer</typeparam>
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public readonly struct FunctionPointer<T> : IFunctionPointer
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{
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// DOTSPLAYER's shim package relies on Burst for it's jobs code
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// so Burst does not see the DOTSPLAYER definition of this attribute
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[NativeDisableUnsafePtrRestriction]
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private readonly IntPtr _ptr;
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/// <summary>
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/// Creates a new instance of this function pointer with the following native pointer.
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/// </summary>
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/// <param name="ptr">Native Pointer</param>
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public FunctionPointer(IntPtr ptr)
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{
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_ptr = ptr;
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}
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/// <summary>
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/// Gets the underlying pointer.
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/// </summary>
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public IntPtr Value => _ptr;
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[Conditional("ENABLE_UNITY_COLLECTIONS_CHECKS")]
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private void CheckIsCreated()
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{
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if (!IsCreated)
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{
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throw new NullReferenceException("Object reference not set to an instance of an object");
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}
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}
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/// <summary>
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/// Gets the delegate associated to this function pointer in order to call the function pointer.
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/// This delegate can be called from a Burst Job or from regular C#.
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/// If calling from regular C#, it is recommended to cache the returned delegate of this property
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/// instead of using this property every time you need to call the delegate.
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/// </summary>
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public T Invoke
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{
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get
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{
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CheckIsCreated();
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return Marshal.GetDelegateForFunctionPointer<T>(_ptr);
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}
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}
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/// <summary>
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/// Whether the function pointer is valid.
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/// </summary>
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public bool IsCreated => _ptr != IntPtr.Zero;
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/// <summary>
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/// Converts a pointer to a function pointer.
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/// </summary>
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/// <param name="ptr">The native pointer.</param>
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/// <returns>An instance of this interface.</returns>
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IFunctionPointer IFunctionPointer.FromIntPtr(IntPtr ptr) => new FunctionPointer<T>(ptr);
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}
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}
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