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‎.gitattributes

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# Auto detect text files and perform LF normalization
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* text=auto

‎.gitignore

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*.sln
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.vs
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.vscode
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.idea
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.DS_Store
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bin
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obj
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Library
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Temp

‎Bitron.Ecs.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard2.0</TargetFramework>
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<DefineConstants>NET_STANDARD_2_0</DefineConstants>
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</PropertyGroup>
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</Project>

‎LICENSE

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MIT License
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Copyright (c) 2022 Aaron Winter
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md

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# BitEcs
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‎src/Commands.cs

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namespace Bitron.Ecs
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{
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public sealed class Commands
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{
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private World _world;
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public EntityCommands Spawn()
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{
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return Entity(_world.Spawn());
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}
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public EntityCommands Entity(Entity entity)
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{
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return new EntityCommands(this, entity);
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}
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public void AddComponent<Component>(Entity entity) where Component: struct
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{
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var storage = _world.GetStorage<Component>();
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storage.Add(entity);
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}
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public void AddComponent<Component>(Entity entity, Component component) where Component: struct
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{
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var storage = _world.GetStorage<Component>();
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storage.Add(entity) = component;
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}
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public void RemoveComponent<Component>(Entity entity) where Component: struct
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{
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var storage = _world.GetStorage<Component>();
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storage.Remove(entity);
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}
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}
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public sealed class EntityCommands
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{
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private Commands _commands;
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private Entity _entity;
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internal EntityCommands(Commands commands, Entity entity)
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{
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_commands = commands;
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_entity = entity;
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}
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public EntityCommands Add<Component>() where Component: struct
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{
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_commands.AddComponent<Component>(_entity);
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return this;
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}
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public EntityCommands Add<Component>(Component component) where Component: struct
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{
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_commands.AddComponent<Component>(_entity, component);
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return this;
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}
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public EntityCommands Remove<Component>() where Component: struct
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{
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_commands.RemoveComponent<Component>(_entity);
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return this;
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}
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public Entity Id()
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{
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return _entity;
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}
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}
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}

‎src/Entity.cs

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namespace Bitron.Ecs
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{
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public struct Entity
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{
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public int Id;
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public int Gen;
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}
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}

‎src/Storage.cs

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using System;
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namespace Bitron.Ecs
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{
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public interface IStorage { }
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public sealed class Storage<Component> : IStorage where Component : struct
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{
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private int[] _indicies;
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private Component[] _components;
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private int _componentCount;
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public ref Component Add(Entity entity)
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{
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int index = _componentCount++;
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if (_componentCount == _components.Length)
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{
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Array.Resize(ref _components, _componentCount << 1);
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}
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_indicies[entity.Id] = index;
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return ref _components[index];
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}
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public void Remove(Entity entity)
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{
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ref var index = ref _indicies[entity.Id];
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if (index > 0)
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{
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_components[index] = default;
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index = 0;
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}
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}
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public bool Has(Entity entity)
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{
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return _indicies[entity.Id] > 0;
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}
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}
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}

‎src/System.cs

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using System.Collections.Generic;
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namespace Bitron.Ecs
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{
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public sealed class EcsSystemGroup
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{
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private List<ISystem> _systems = new List<ISystem>();
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public EcsSystemGroup Add(ISystem system)
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{
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_systems.Add(system);
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return this;
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}
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// public EcsSystemGroup OneFrame<Component>() where Component : struct
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// {
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// return Add(new RemoveAllComponentsOfType<Component>());
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// }
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public void Run(Commands commands)
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{
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for(var i = 0; i < _systems.Count; i++)
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{
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_systems[i].Run(commands);
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}
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}
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}
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public interface ISystem
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{
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void Run(Commands commands);
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}
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// public class RemoveAllComponentsOfType<Component> : ISystem where Component : struct
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// {
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// public void Run(World world)
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// {
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// var query = world.Query<Component>().End();
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// var pool = world.GetPool<Component>();
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// foreach (var entity in query)
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// {
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// pool.Remove(entity);
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// }
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// }
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// }
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}

‎src/World.cs

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using System;
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namespace Bitron.Ecs
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{
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public sealed class World
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{
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private EntityMeta[] _entityMetas;
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private int _entityCount;
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private int _despawnedEntityCount;
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private int[] _despawnedEntities;
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private IStorage[] _pools;
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private int _poolCount;
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public Entity Spawn()
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{
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int id;
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int gen;
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if (_despawnedEntityCount > 0)
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{
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id = _despawnedEntities[--_despawnedEntityCount];
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gen = -(_entityMetas[id]).Gen;
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}
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else
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{
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id = _entityCount++;
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gen = 1;
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}
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_entityMetas[id].Gen = gen;
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return new Entity() { Id = id, Gen = gen };
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}
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public void Despawn(Entity entity)
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{
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if (_entityMetas[entity.Id].Gen < 0)
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{
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return;
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}
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if (_despawnedEntityCount == _despawnedEntities.Length)
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{
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Array.Resize(ref _despawnedEntities, _despawnedEntityCount << 1);
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}
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ref var meta = ref _entityMetas[entity.Id];
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meta.Gen = -(meta.Gen + 1);
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_despawnedEntities[_despawnedEntityCount++] = entity.Id;
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}
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public Storage<Component> GetStorage<Component>() where Component : struct
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{
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var typeId = ComponentType<Component>.Id;
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if (typeId == _poolCount)
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{
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Array.Resize(ref _pools, _poolCount << 1);
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_pools[typeId] = new Storage<Component>();
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_poolCount++;
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}
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return _pools[typeId] as Storage<Component>;
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}
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}
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internal struct EntityMeta
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{
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public int Gen;
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}
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internal class ComponentType
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{
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protected static int counter = 0;
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}
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internal class ComponentType<T> : ComponentType
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{
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public static readonly int Id;
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static ComponentType() => Id = counter++;
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}
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}

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