665 lines
26 KiB
C#
665 lines
26 KiB
C#
using System;
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using Unity.Burst;
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using Unity.Jobs;
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using Unity.Jobs.LowLevel.Unsafe;
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using UnityEngine.Assertions;
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namespace Unity.Collections.LowLevel.Unsafe
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{
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[BurstCompatible]
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internal unsafe struct UnsafeStreamBlock
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{
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internal UnsafeStreamBlock* Next;
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internal fixed byte Data[1];
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}
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[BurstCompatible]
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internal unsafe struct UnsafeStreamRange
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{
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internal UnsafeStreamBlock* Block;
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internal int OffsetInFirstBlock;
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internal int ElementCount;
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/// One byte past the end of the last byte written
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internal int LastOffset;
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internal int NumberOfBlocks;
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}
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[BurstCompatible]
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internal unsafe struct UnsafeStreamBlockData
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{
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internal const int AllocationSize = 4 * 1024;
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internal AllocatorManager.AllocatorHandle Allocator;
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internal UnsafeStreamBlock** Blocks;
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internal int BlockCount;
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internal UnsafeStreamBlock* Free;
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internal UnsafeStreamRange* Ranges;
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internal int RangeCount;
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internal UnsafeStreamBlock* Allocate(UnsafeStreamBlock* oldBlock, int threadIndex)
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{
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Assert.IsTrue(threadIndex < BlockCount && threadIndex >= 0);
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UnsafeStreamBlock* block = (UnsafeStreamBlock*)Memory.Unmanaged.Allocate(AllocationSize, 16, Allocator);
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block->Next = null;
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if (oldBlock == null)
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{
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// Append our new block in front of the previous head.
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block->Next = Blocks[threadIndex];
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Blocks[threadIndex] = block;
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}
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else
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{
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oldBlock->Next = block;
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}
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return block;
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}
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}
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/// <summary>
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/// A set of untyped, append-only buffers. Allows for concurrent reading and concurrent writing without synchronization.
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/// </summary>
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/// <remarks>
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/// As long as each individual buffer is written in one thread and read in one thread, multiple
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/// threads can read and write the stream concurrently, *e.g.*
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/// while thread *A* reads from buffer *X* of a stream, thread *B* can read from
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/// buffer *Y* of the same stream.
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///
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/// Each buffer is stored as a chain of blocks. When a write exceeds a buffer's current capacity, another block
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/// is allocated and added to the end of the chain. Effectively, expanding the buffer never requires copying the existing
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/// data (unlike, for example, with <see cref="NativeList{T}"/>).
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///
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/// **All writing to a stream should be completed before the stream is first read. Do not write to a stream after the first read.**
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///
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/// Writing is done with <see cref="NativeStream.Writer"/>, and reading is done with <see cref="NativeStream.Reader"/>.
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/// An individual reader or writer cannot be used concurrently across threads. Each thread must use its own.
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///
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/// The data written to an individual buffer can be heterogeneous in type, and the data written
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/// to different buffers of a stream can be entirely different in type, number, and order. Just make sure
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/// that the code reading from a particular buffer knows what to expect to read from it.
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/// </remarks>
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[BurstCompatible]
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public unsafe struct UnsafeStream
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: INativeDisposable
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{
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[NativeDisableUnsafePtrRestriction]
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internal UnsafeStreamBlockData* m_Block;
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internal AllocatorManager.AllocatorHandle m_Allocator;
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/// <summary>
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/// Initializes and returns an instance of UnsafeStream.
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/// </summary>
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/// <param name="bufferCount">The number of buffers to give the stream. You usually want
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/// one buffer for each thread that will read or write the stream.</param>
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/// <param name="allocator">The allocator to use.</param>
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public UnsafeStream(int bufferCount, AllocatorManager.AllocatorHandle allocator)
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{
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AllocateBlock(out this, allocator);
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AllocateForEach(bufferCount);
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}
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/// <summary>
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/// Creates and schedules a job to allocate a new stream.
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/// </summary>
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/// <remarks>The stream can be used on the main thread after completing the returned job or used in other jobs that depend upon the returned job.
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///
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/// Using a job to allocate the buffers can be more efficient, particularly for a stream with many buffers.
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/// </remarks>
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/// <typeparam name="T">Ignored.</typeparam>
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/// <param name="stream">Outputs the new stream.</param>
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/// <param name="bufferCount">A list whose length determines the number of buffers in the stream.</param>
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/// <param name="dependency">A job handle. The new job will depend upon this handle.</param>
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/// <param name="allocator">The allocator to use.</param>
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/// <returns>The handle of the new job.</returns>
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[NotBurstCompatible /* This is not burst compatible because of IJob's use of a static IntPtr. Should switch to IJobBurstSchedulable in the future */]
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public static JobHandle ScheduleConstruct<T>(out UnsafeStream stream, NativeList<T> bufferCount, JobHandle dependency, AllocatorManager.AllocatorHandle allocator)
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where T : unmanaged
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{
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AllocateBlock(out stream, allocator);
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var jobData = new ConstructJobList { List = (UntypedUnsafeList*)bufferCount.GetUnsafeList(), Container = stream };
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return jobData.Schedule(dependency);
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}
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/// <summary>
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/// Creates and schedules a job to allocate a new stream.
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/// </summary>
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/// <remarks>The stream can be used on the main thread after completing the returned job or used in other jobs that depend upon the returned job.
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///
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/// Allocating the buffers in a job can be more efficient, particularly for a stream with many buffers.
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/// </remarks>
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/// <param name="stream">Outputs the new stream.</param>
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/// <param name="bufferCount">An array whose value at index 0 determines the number of buffers in the stream.</param>
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/// <param name="dependency">A job handle. The new job will depend upon this handle.</param>
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/// <param name="allocator">The allocator to use.</param>
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/// <returns>The handle of the new job.</returns>
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[NotBurstCompatible /* This is not burst compatible because of IJob's use of a static IntPtr. Should switch to IJobBurstSchedulable in the future */]
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public static JobHandle ScheduleConstruct(out UnsafeStream stream, NativeArray<int> bufferCount, JobHandle dependency, AllocatorManager.AllocatorHandle allocator)
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{
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AllocateBlock(out stream, allocator);
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var jobData = new ConstructJob { Length = bufferCount, Container = stream };
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return jobData.Schedule(dependency);
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}
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internal static void AllocateBlock(out UnsafeStream stream, AllocatorManager.AllocatorHandle allocator)
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{
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int blockCount = JobsUtility.MaxJobThreadCount;
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int allocationSize = sizeof(UnsafeStreamBlockData) + sizeof(UnsafeStreamBlock*) * blockCount;
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byte* buffer = (byte*)Memory.Unmanaged.Allocate(allocationSize, 16, allocator);
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UnsafeUtility.MemClear(buffer, allocationSize);
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var block = (UnsafeStreamBlockData*)buffer;
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stream.m_Block = block;
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stream.m_Allocator = allocator;
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block->Allocator = allocator;
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block->BlockCount = blockCount;
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block->Blocks = (UnsafeStreamBlock**)(buffer + sizeof(UnsafeStreamBlockData));
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block->Ranges = null;
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block->RangeCount = 0;
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}
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internal void AllocateForEach(int forEachCount)
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{
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long allocationSize = sizeof(UnsafeStreamRange) * forEachCount;
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m_Block->Ranges = (UnsafeStreamRange*)Memory.Unmanaged.Allocate(allocationSize, 16, m_Allocator);
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m_Block->RangeCount = forEachCount;
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UnsafeUtility.MemClear(m_Block->Ranges, allocationSize);
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}
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/// <summary>
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/// Returns true if this stream is empty.
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/// </summary>
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/// <returns>True if this stream is empty or the stream has not been constructed.</returns>
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public bool IsEmpty()
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{
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if (!IsCreated)
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{
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return true;
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}
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for (int i = 0; i != m_Block->RangeCount; i++)
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{
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if (m_Block->Ranges[i].ElementCount > 0)
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{
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return false;
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}
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}
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return true;
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}
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/// <summary>
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/// Whether this stream has been allocated (and not yet deallocated).
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/// </summary>
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/// <remarks>Does not necessarily reflect whether the buffers of the stream have themselves been allocated.</remarks>
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/// <value>True if this stream has been allocated (and not yet deallocated).</value>
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public bool IsCreated => m_Block != null;
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/// <summary>
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/// The number of buffers in this stream.
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/// </summary>
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/// <value>The number of buffers in this stream.</value>
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public int ForEachCount => m_Block->RangeCount;
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/// <summary>
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/// Returns a reader of this stream.
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/// </summary>
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/// <returns>A reader of this stream.</returns>
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public Reader AsReader()
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{
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return new Reader(ref this);
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}
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/// <summary>
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/// Returns a writer of this stream.
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/// </summary>
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/// <returns>A writer of this stream.</returns>
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public Writer AsWriter()
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{
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return new Writer(ref this);
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}
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/// <summary>
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/// Returns the total number of items in the buffers of this stream.
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/// </summary>
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/// <remarks>Each <see cref="Writer.Write{T}"/> and <see cref="Writer.Allocate"/> call increments this number.</remarks>
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/// <returns>The total number of items in the buffers of this stream.</returns>
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public int Count()
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{
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int itemCount = 0;
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for (int i = 0; i != m_Block->RangeCount; i++)
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{
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itemCount += m_Block->Ranges[i].ElementCount;
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}
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return itemCount;
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}
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/// <summary>
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/// Returns a new NativeArray copy of this stream's data.
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/// </summary>
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/// <remarks>The length of the array will equal the count of this stream.
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///
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/// Each buffer of this stream is copied to the array, one after the other.
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/// </remarks>
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/// <typeparam name="T">The type of values in the array.</typeparam>
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/// <param name="allocator">The allocator to use.</param>
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/// <returns>A new NativeArray copy of this stream's data.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(int) })]
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public NativeArray<T> ToNativeArray<T>(AllocatorManager.AllocatorHandle allocator) where T : struct
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{
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var array = CollectionHelper.CreateNativeArray<T>(Count(), allocator, NativeArrayOptions.UninitializedMemory);
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var reader = AsReader();
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int offset = 0;
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for (int i = 0; i != reader.ForEachCount; i++)
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{
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reader.BeginForEachIndex(i);
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int rangeItemCount = reader.RemainingItemCount;
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for (int j = 0; j < rangeItemCount; ++j)
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{
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array[offset] = reader.Read<T>();
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offset++;
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}
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reader.EndForEachIndex();
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}
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return array;
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}
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void Deallocate()
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{
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if (m_Block == null)
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{
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return;
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}
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for (int i = 0; i != m_Block->BlockCount; i++)
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{
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UnsafeStreamBlock* block = m_Block->Blocks[i];
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while (block != null)
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{
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UnsafeStreamBlock* next = block->Next;
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Memory.Unmanaged.Free(block, m_Allocator);
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block = next;
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}
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}
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Memory.Unmanaged.Free(m_Block->Ranges, m_Allocator);
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Memory.Unmanaged.Free(m_Block, m_Allocator);
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m_Block = null;
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m_Allocator = Allocator.None;
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}
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/// <summary>
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/// Releases all resources (memory).
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/// </summary>
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public void Dispose()
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{
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Deallocate();
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}
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/// <summary>
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/// Creates and schedules a job that will release all resources (memory and safety handles) of this stream.
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/// </summary>
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/// <param name="inputDeps">A job handle which the newly scheduled job will depend upon.</param>
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/// <returns>The handle of a new job that will release all resources (memory and safety handles) of this stream.</returns>
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[NotBurstCompatible /* This is not burst compatible because of IJob's use of a static IntPtr. Should switch to IJobBurstSchedulable in the future */]
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public JobHandle Dispose(JobHandle inputDeps)
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{
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var jobHandle = new DisposeJob { Container = this }.Schedule(inputDeps);
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m_Block = null;
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return jobHandle;
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}
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[BurstCompile]
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struct DisposeJob : IJob
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{
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public UnsafeStream Container;
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public void Execute()
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{
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Container.Deallocate();
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}
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}
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[BurstCompile]
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struct ConstructJobList : IJob
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{
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public UnsafeStream Container;
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[ReadOnly]
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[NativeDisableUnsafePtrRestriction]
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public UntypedUnsafeList* List;
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public void Execute()
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{
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Container.AllocateForEach(List->m_length);
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}
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}
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[BurstCompile]
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struct ConstructJob : IJob
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{
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public UnsafeStream Container;
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[ReadOnly]
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public NativeArray<int> Length;
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public void Execute()
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{
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Container.AllocateForEach(Length[0]);
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}
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}
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/// <summary>
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/// Writes data into a buffer of an <see cref="UnsafeStream"/>.
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/// </summary>
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/// <remarks>An individual writer can only be used for one buffer of one stream.
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/// Do not create more than one writer for an individual buffer.</remarks>
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[BurstCompatible]
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public unsafe struct Writer
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{
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[NativeDisableUnsafePtrRestriction]
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internal UnsafeStreamBlockData* m_BlockStream;
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[NativeDisableUnsafePtrRestriction]
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UnsafeStreamBlock* m_CurrentBlock;
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[NativeDisableUnsafePtrRestriction]
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byte* m_CurrentPtr;
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[NativeDisableUnsafePtrRestriction]
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byte* m_CurrentBlockEnd;
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internal int m_ForeachIndex;
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int m_ElementCount;
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[NativeDisableUnsafePtrRestriction]
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UnsafeStreamBlock* m_FirstBlock;
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int m_FirstOffset;
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int m_NumberOfBlocks;
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[NativeSetThreadIndex]
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int m_ThreadIndex;
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internal Writer(ref UnsafeStream stream)
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{
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m_BlockStream = stream.m_Block;
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m_ForeachIndex = int.MinValue;
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m_ElementCount = -1;
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m_CurrentBlock = null;
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m_CurrentBlockEnd = null;
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m_CurrentPtr = null;
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m_FirstBlock = null;
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m_NumberOfBlocks = 0;
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m_FirstOffset = 0;
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m_ThreadIndex = 0;
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}
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/// <summary>
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/// The number of buffers in the stream of this writer.
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/// </summary>
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/// <value>The number of buffers in the stream of this writer.</value>
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public int ForEachCount => m_BlockStream->RangeCount;
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/// <summary>
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/// Readies this writer to write to a particular buffer of the stream.
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/// </summary>
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/// <remarks>Must be called before using this writer. For an individual writer, call this method only once.
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///
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/// When done using this writer, you must call <see cref="EndForEachIndex"/>.</remarks>
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/// <param name="foreachIndex">The index of the buffer to write.</param>
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public void BeginForEachIndex(int foreachIndex)
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{
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m_ForeachIndex = foreachIndex;
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m_ElementCount = 0;
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m_NumberOfBlocks = 0;
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m_FirstBlock = m_CurrentBlock;
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m_FirstOffset = (int)(m_CurrentPtr - (byte*)m_CurrentBlock);
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}
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/// <summary>
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/// Readies the buffer written by this writer for reading.
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/// </summary>
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/// <remarks>Must be called before reading the buffer written by this writer.</remarks>
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public void EndForEachIndex()
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{
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m_BlockStream->Ranges[m_ForeachIndex].ElementCount = m_ElementCount;
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m_BlockStream->Ranges[m_ForeachIndex].OffsetInFirstBlock = m_FirstOffset;
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m_BlockStream->Ranges[m_ForeachIndex].Block = m_FirstBlock;
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m_BlockStream->Ranges[m_ForeachIndex].LastOffset = (int)(m_CurrentPtr - (byte*)m_CurrentBlock);
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m_BlockStream->Ranges[m_ForeachIndex].NumberOfBlocks = m_NumberOfBlocks;
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}
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/// <summary>
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/// Write a value to a buffer.
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/// </summary>
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/// <remarks>The value is written to the buffer which was specified
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/// with <see cref="BeginForEachIndex"/>.</remarks>
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/// <typeparam name="T">The type of value to write.</typeparam>
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/// <param name="value">The value to write.</param>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(int) })]
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public void Write<T>(T value) where T : struct
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{
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ref T dst = ref Allocate<T>();
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dst = value;
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}
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/// <summary>
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/// Allocate space in a buffer.
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/// </summary>
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/// <remarks>The space is allocated in the buffer which was specified
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/// with <see cref="BeginForEachIndex"/>.</remarks>
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/// <typeparam name="T">The type of value to allocate space for.</typeparam>
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/// <returns>A reference to the allocation.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(int) })]
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public ref T Allocate<T>() where T : struct
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{
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int size = UnsafeUtility.SizeOf<T>();
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return ref UnsafeUtility.AsRef<T>(Allocate(size));
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}
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/// <summary>
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/// Allocate space in a buffer.
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/// </summary>
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/// <remarks>The space is allocated in the buffer which was specified
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/// with <see cref="BeginForEachIndex"/>.</remarks>
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/// <param name="size">The number of bytes to allocate.</param>
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/// <returns>The allocation.</returns>
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public byte* Allocate(int size)
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{
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byte* ptr = m_CurrentPtr;
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m_CurrentPtr += size;
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if (m_CurrentPtr > m_CurrentBlockEnd)
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{
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UnsafeStreamBlock* oldBlock = m_CurrentBlock;
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m_CurrentBlock = m_BlockStream->Allocate(oldBlock, m_ThreadIndex);
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m_CurrentPtr = m_CurrentBlock->Data;
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if (m_FirstBlock == null)
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{
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m_FirstOffset = (int)(m_CurrentPtr - (byte*)m_CurrentBlock);
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m_FirstBlock = m_CurrentBlock;
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}
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else
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{
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m_NumberOfBlocks++;
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}
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m_CurrentBlockEnd = (byte*)m_CurrentBlock + UnsafeStreamBlockData.AllocationSize;
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ptr = m_CurrentPtr;
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m_CurrentPtr += size;
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}
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m_ElementCount++;
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return ptr;
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}
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}
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/// <summary>
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/// Reads data from a buffer of an <see cref="UnsafeStream"/>.
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/// </summary>
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/// <remarks>An individual reader can only be used for one buffer of one stream.
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/// Do not create more than one reader for an individual buffer.</remarks>
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[BurstCompatible]
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public unsafe struct Reader
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{
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[NativeDisableUnsafePtrRestriction]
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internal UnsafeStreamBlockData* m_BlockStream;
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[NativeDisableUnsafePtrRestriction]
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internal UnsafeStreamBlock* m_CurrentBlock;
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[NativeDisableUnsafePtrRestriction]
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internal byte* m_CurrentPtr;
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[NativeDisableUnsafePtrRestriction]
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internal byte* m_CurrentBlockEnd;
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internal int m_RemainingItemCount;
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internal int m_LastBlockSize;
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internal Reader(ref UnsafeStream stream)
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{
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m_BlockStream = stream.m_Block;
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m_CurrentBlock = null;
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m_CurrentPtr = null;
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m_CurrentBlockEnd = null;
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m_RemainingItemCount = 0;
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m_LastBlockSize = 0;
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}
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/// <summary>
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/// Readies this reader to read a particular buffer of the stream.
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/// </summary>
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/// <remarks>Must be called before using this reader. For an individual reader, call this method only once.
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///
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/// When done using this reader, you must call <see cref="EndForEachIndex"/>.</remarks>
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/// <param name="foreachIndex">The index of the buffer to read.</param>
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/// <returns>The number of remaining elements to read from the buffer.</returns>
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public int BeginForEachIndex(int foreachIndex)
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{
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m_RemainingItemCount = m_BlockStream->Ranges[foreachIndex].ElementCount;
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m_LastBlockSize = m_BlockStream->Ranges[foreachIndex].LastOffset;
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m_CurrentBlock = m_BlockStream->Ranges[foreachIndex].Block;
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m_CurrentPtr = (byte*)m_CurrentBlock + m_BlockStream->Ranges[foreachIndex].OffsetInFirstBlock;
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m_CurrentBlockEnd = (byte*)m_CurrentBlock + UnsafeStreamBlockData.AllocationSize;
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return m_RemainingItemCount;
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}
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/// <summary>
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/// Does nothing.
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/// </summary>
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/// <remarks>Included only for consistency with <see cref="NativeStream"/>.</remarks>
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public void EndForEachIndex()
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{
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}
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/// <summary>
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/// The number of buffers in the stream of this reader.
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/// </summary>
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/// <value>The number of buffers in the stream of this reader.</value>
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public int ForEachCount => m_BlockStream->RangeCount;
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/// <summary>
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/// The number of items not yet read from the buffer.
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/// </summary>
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/// <value>The number of items not yet read from the buffer.</value>
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public int RemainingItemCount => m_RemainingItemCount;
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/// <summary>
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/// Returns a pointer to the next position to read from the buffer. Advances the reader some number of bytes.
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/// </summary>
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/// <param name="size">The number of bytes to advance the reader.</param>
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/// <returns>A pointer to the next position to read from the buffer.</returns>
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/// <exception cref="System.ArgumentException">Thrown if the reader has been advanced past the end of the buffer.</exception>
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public byte* ReadUnsafePtr(int size)
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{
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m_RemainingItemCount--;
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byte* ptr = m_CurrentPtr;
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m_CurrentPtr += size;
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if (m_CurrentPtr > m_CurrentBlockEnd)
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{
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m_CurrentBlock = m_CurrentBlock->Next;
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m_CurrentPtr = m_CurrentBlock->Data;
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m_CurrentBlockEnd = (byte*)m_CurrentBlock + UnsafeStreamBlockData.AllocationSize;
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ptr = m_CurrentPtr;
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m_CurrentPtr += size;
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}
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return ptr;
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}
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/// <summary>
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/// Reads the next value from the buffer.
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/// </summary>
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/// <remarks>Each read advances the reader to the next item in the buffer.</remarks>
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/// <typeparam name="T">The type of value to read.</typeparam>
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/// <returns>A reference to the next value from the buffer.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(int) })]
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public ref T Read<T>() where T : struct
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{
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int size = UnsafeUtility.SizeOf<T>();
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return ref UnsafeUtility.AsRef<T>(ReadUnsafePtr(size));
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}
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/// <summary>
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/// Reads the next value from the buffer. Does not advance the reader.
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/// </summary>
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/// <typeparam name="T">The type of value to read.</typeparam>
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/// <returns>A reference to the next value from the buffer.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(int) })]
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public ref T Peek<T>() where T : struct
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{
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int size = UnsafeUtility.SizeOf<T>();
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byte* ptr = m_CurrentPtr;
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if (ptr + size > m_CurrentBlockEnd)
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{
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ptr = m_CurrentBlock->Next->Data;
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}
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return ref UnsafeUtility.AsRef<T>(ptr);
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}
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/// <summary>
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/// Returns the total number of items in the buffers of the stream.
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/// </summary>
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/// <returns>The total number of items in the buffers of the stream.</returns>
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public int Count()
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{
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int itemCount = 0;
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for (int i = 0; i != m_BlockStream->RangeCount; i++)
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{
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itemCount += m_BlockStream->Ranges[i].ElementCount;
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}
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return itemCount;
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}
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}
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}
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}
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