159 lines
3.6 KiB
C#
159 lines
3.6 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using MoonTools.ECS.Collections;
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namespace MoonTools.ECS;
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public class ComponentStorage : IDisposable
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{
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internal readonly NativeArray<Entity> DenseArray = new NativeArray<Entity>();
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internal readonly NativeArray<int> SparseArray = new NativeArray<int>();
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internal nint ElementArray;
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internal int ElementArrayCapacity;
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private bool IsDisposed;
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public int ElementSize { get; private set; }
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public int Count => DenseArray.Count;
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public unsafe ComponentStorage(int elementSize)
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{
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for (var i = 0; i < 16; i += 1)
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{
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SparseArray.Append(Entity.Null.ID); // sentinel value
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}
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ElementArrayCapacity = 16;
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ElementArray = (nint) NativeMemory.Alloc((nuint) (elementSize * ElementArrayCapacity));
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ElementSize = elementSize;
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}
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public bool Any() => DenseArray.Count > 0;
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public unsafe ref T Get<T>(Entity entity) where T : unmanaged
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{
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return ref ((T*) ElementArray)[SparseArray[entity.ID]];
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}
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public unsafe ref T GetFirst<T>() where T : unmanaged
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{
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#if DEBUG
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if (DenseArray.Count == 0)
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{
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throw new IndexOutOfRangeException("Component storage is empty!");
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}
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#endif
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return ref ((T*) ElementArray)[0];
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}
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public unsafe bool Set<T>(Entity entity, T component) where T : unmanaged
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{
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var newEntity = entity.ID >= SparseArray.Count || SparseArray[entity.ID] == Entity.Null.ID;
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if (newEntity)
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{
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// the entity is being added! let's do some record keeping
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var index = DenseArray.Count;
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DenseArray.Append(entity);
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if (entity.ID >= SparseArray.Count)
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{
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var oldCount = SparseArray.Count;
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SparseArray.ResizeTo(entity.ID + 1);
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for (var i = oldCount; i < SparseArray.Capacity; i += 1)
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{
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SparseArray.Append(Entity.Null.ID); // sentinel value
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}
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}
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SparseArray[entity.ID] = index;
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if (entity.ID >= ElementArrayCapacity)
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{
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ElementArrayCapacity = entity.ID + 1;
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ElementArray = (nint) NativeMemory.Realloc((void*) ElementArray, (nuint) (ElementArrayCapacity * ElementSize));
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}
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}
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Unsafe.Write((void*) (ElementArray + ElementSize * SparseArray[entity.ID]), component);
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return !newEntity;
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}
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public bool Has(Entity entity)
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{
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return entity.ID < SparseArray.Count && SparseArray[entity.ID] != Entity.Null.ID;
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}
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public unsafe bool Remove(Entity entity)
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{
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if (Has(entity))
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{
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var denseIndex = SparseArray[entity.ID];
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var lastItem = DenseArray[DenseArray.Count - 1];
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DenseArray[denseIndex] = lastItem;
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SparseArray[lastItem.ID] = denseIndex;
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SparseArray[entity.ID] = Entity.Null.ID; // sentinel value
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if (denseIndex != DenseArray.Count - 1)
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{
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NativeMemory.Copy((void*) (ElementArray + ElementSize * (DenseArray.Count - 1)), (void*) (ElementArray + ElementSize * denseIndex), (nuint) ElementSize);
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}
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DenseArray.RemoveLastElement();
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return true;
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}
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return false;
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}
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public void Clear()
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{
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DenseArray.Clear();
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for (var i = 0; i < SparseArray.Capacity; i += 1)
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{
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SparseArray[i] = Entity.Null.ID;
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}
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}
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public Entity FirstEntity()
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{
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#if DEBUG
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if (DenseArray.Count == 0)
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{
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throw new IndexOutOfRangeException("Component storage is empty!");
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}
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#endif
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return DenseArray[0];
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}
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#if DEBUG
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internal Span<Entity> Debug_GetEntities()
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{
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return DenseArray.ToSpan();
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}
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#endif
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protected unsafe virtual void Dispose(bool disposing)
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{
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if (!IsDisposed)
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{
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if (disposing)
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{
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DenseArray.Dispose();
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SparseArray.Dispose();
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}
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NativeMemory.Free((void*) ElementArray);
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IsDisposed = true;
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}
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}
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public void Dispose()
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{
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// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
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Dispose(disposing: true);
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GC.SuppressFinalize(this);
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}
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}
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