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MoonTools.ECS
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fast snapshot restore

rev2
cosmonaut 2023-10-26 11:02:45 -07:00
parent 5419fbd72d
commit 344a0082b4
2 changed files with 19 additions and 13 deletions
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25
src/Rev2/Snapshot.cs
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@ -87,23 +87,30 @@ public class Snapshot
public void Restore(Archetype archetype)
{
// Clear out existing entities
archetype.ClearAll();
// Copy all component data
for (int i = 0; i < ComponentColumns.Count; i += 1)
{
ComponentColumns[i].CopyAllTo(archetype.ComponentColumns[i]);
}
// Clear the row to entity list
archetype.RowToEntity.Clear();
var archetypeCount = archetype.Count;
// Create new entities and repopulate the row to entity list
for (int i = 0; i < Count; i += 1)
if (Count < archetypeCount)
{
var entityId = archetype.World.CreateEntityOnArchetype(archetype);
archetype.RowToEntity.Add(entityId);
// if snapshot has fewer entities than archetype, remove extra entities
for (int i = archetypeCount - 1; i >= Count; i -= 1)
{
archetype.World.FreeEntity(archetype.RowToEntity[i]);
archetype.RowToEntity.RemoveAt(i);
}
}
else if (Count > archetypeCount)
{
// if snapshot has more entities than archetype, add entities
for (int i = archetypeCount; i < Count; i += 1)
{
archetype.World.CreateEntityOnArchetype(archetype);
}
}
}
}

7
src/Rev2/World.cs
View File

@ -67,16 +67,15 @@ namespace MoonTools.ECS.Rev2
return entityId;
}
// used as a fast path by Archetype.Transfer
internal EntityId CreateEntityOnArchetype(Archetype archetype)
// used as a fast path by snapshot restore
internal void CreateEntityOnArchetype(Archetype archetype)
{
var entityId = EntityIdAssigner.Assign();
EntityIndex.Add(entityId, new Record(archetype, archetype.Count));
archetype.RowToEntity.Add(entityId);
return entityId;
}
// used as a fast path by Archetype.ClearAll
// used as a fast path by Archetype.ClearAll and snapshot restore
internal void FreeEntity(EntityId entityId)
{
EntityIndex.Remove(entityId);