84 lines
2.4 KiB
C#
84 lines
2.4 KiB
C#
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namespace OECS;
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/// <summary>
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/// Accumulates <see cref="EntityChange"/> entries during a system run.
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///
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/// Deduplication: if the same (entity, kind, componentType) change is marked
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/// multiple times, only one entry is kept. Entity-level changes (Added/Removed)
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/// take precedence over component-level changes for the same entity.
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/// </summary>
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internal class ChangeSet
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{
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private readonly List<EntityChange> _changes = new();
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private readonly HashSet<(Entity Entity, ChangeKind Kind, Type? ComponentType)> _dedup = new();
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/// <summary>
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/// All accumulated changes in insertion order.
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/// </summary>
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public IReadOnlyList<EntityChange> Changes => _changes;
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/// <summary>
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/// Number of changes in this set.
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/// </summary>
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public int Count => _changes.Count;
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/// <summary>
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/// Records that an entity was created.
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/// </summary>
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public void MarkEntityAdded(Entity entity)
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{
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TryAdd(new EntityChange(entity, ChangeKind.EntityAdded));
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}
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/// <summary>
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/// Records that an entity was destroyed.
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/// </summary>
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public void MarkEntityRemoved(Entity entity)
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{
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TryAdd(new EntityChange(entity, ChangeKind.EntityRemoved));
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}
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/// <summary>
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/// Records that a component was added to an entity.
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/// </summary>
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public void MarkComponentAdded(Entity entity, Type componentType)
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{
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TryAdd(new EntityChange(entity, ChangeKind.ComponentAdded, componentType));
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}
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/// <summary>
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/// Records that a component was removed from an entity.
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/// </summary>
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public void MarkComponentRemoved(Entity entity, Type componentType)
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{
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TryAdd(new EntityChange(entity, ChangeKind.ComponentRemoved, componentType));
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}
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/// <summary>
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/// Records that a component's value was modified.
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/// Must be called explicitly by user code via <see cref="World.MarkModified{T}"/>.
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/// </summary>
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public void MarkComponentModified(Entity entity, Type componentType)
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{
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TryAdd(new EntityChange(entity, ChangeKind.ComponentModified, componentType));
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}
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/// <summary>
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/// Clears all accumulated changes.
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/// </summary>
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public void Clear()
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{
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_changes.Clear();
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_dedup.Clear();
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}
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private void TryAdd(EntityChange change)
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{
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var key = (change.Entity, change.Kind, change.ComponentType);
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if (_dedup.Add(key))
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{
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_changes.Add(change);
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}
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}
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}
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