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AbstractConcept 2022-09-13 00:36:34 -05:00
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Library/PackageCache/com.unity.2d.animation@3.2.6/Runtime/NativeArrayHelper.cs Normal file
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using Unity.Collections;
using Unity.Collections.LowLevel.Unsafe;
namespace UnityEngine.U2D.Animation
{
internal static class NativeArrayHelpers
{
public static unsafe void ResizeIfNeeded<T>(ref NativeArray<T> nativeArray, int size, Allocator allocator = Allocator.Persistent) where T : struct
{
bool canDispose = nativeArray.IsCreated;
if (canDispose && nativeArray.Length != size)
{
nativeArray.Dispose();
canDispose = false;
}
if(!canDispose)
nativeArray = new NativeArray<T>(size, allocator);
}
public static void ResizeAndCopyIfNeeded<T>(ref NativeArray<T> nativeArray, int size, Allocator allocator = Allocator.Persistent) where T : struct
{
bool canDispose = nativeArray.IsCreated;
if (canDispose && nativeArray.Length == size)
return;
var newArray = new NativeArray<T>(size, allocator);
if (canDispose)
{
NativeArray<T>.Copy(nativeArray, newArray, size < nativeArray.Length ? size : nativeArray.Length);
nativeArray.Dispose();
}
nativeArray = newArray;
}
public static unsafe void DisposeIfCreated<T>(this NativeArray<T> nativeArray) where T : struct
{
if (nativeArray.IsCreated)
nativeArray.Dispose();
}
[WriteAccessRequired]
public static unsafe void CopyFromNativeSlice<T, S>(this NativeArray<T> nativeArray, int dstStartIndex, int dstEndIndex, NativeSlice<S> slice, int srcStartIndex, int srcEndIndex) where T : struct where S : struct
{
if ((dstEndIndex - dstStartIndex) != (srcEndIndex - srcStartIndex))
throw new System.ArgumentException($"Destination and Source copy counts must match.", nameof(slice));
var dstSizeOf = UnsafeUtility.SizeOf<T>();
var srcSizeOf = UnsafeUtility.SizeOf<T>();
byte* srcPtr = (byte*)slice.GetUnsafeReadOnlyPtr();
srcPtr = srcPtr + (srcStartIndex * srcSizeOf);
byte* dstPtr = (byte*)nativeArray.GetUnsafePtr();
dstPtr = dstPtr + (dstStartIndex * dstSizeOf);
UnsafeUtility.MemCpyStride(dstPtr, srcSizeOf, srcPtr, slice.Stride, dstSizeOf, srcEndIndex - srcStartIndex);
}
}
}