Morpeh

🎲 ECS Framework for Unity Game Engine and .Net Platform

• Simple Syntax.
• Plug & Play Installation.
• No code generation (yet).
• Structure-Based and Cache-Friendly.

Key points for people familiar with other ECS frameworks:

• Archetype-based, but stores data separately from archetypes. Archetypes are used only for filtering, and there's no archetype transition graph, which means you should not worry about performance degradation over time for lots of chaotically changing entities.
• Components are stored in "stashes", which are also known as "pools" in other frameworks.
• Filters are used to select entities based on component types, but unlike other frameworks they should not be used in-place, and should rather be declared in the system OnAwake and stored in a variable.
• Filters directly store archetypes, and you can know if the filter is empty or not without iterating over it, possibly reducing systems idle time, especially in the case of a large number of systems, which is generally useful for Unity's IL2CPP.
• Designed to work well with a large quantity of different component types and systems in a single world (several thousands of component types and systems), but not necessarily with a large number of entities.
• Designed to work well in a large team with a large codebase, reducing the amount of things a typical developer should remember and account for. You are free to migrate entities by doing structural changes even if an entity contains tens of different components without a significant performance impact.

📖 Table of Contents

• Migration
• How To Install
  • Unity Engine
  • .Net Platform
• Introduction
  • Base concept of ECS pattern
  • Getting Started
  • Advanced
    • Filter Extensions
    • Filter Disposing
    • Aspects
    • Component Disposing
    • Unity Jobs And Burst
    • Defines
    • World Plugins
    • Metrics
    • Stash size
    • Collections
• Plugins
• Examples
• Games
• License
• Contacts

🛸 Migration To New Version

English version: Migration Guide
Russian version: Гайд по миграции

📖 How To Install

Unity Engine

Minimal required Unity Version is 2020.3.*
Requires Git for installing package.
Requires Tri Inspector for drawing the inspector.

Open Unity Package Manager and add Morpeh URL.

    ⭐ Master: https://github.com/scellecs/morpeh.git?path=Scellecs.Morpeh
    🚧 Stage: https://github.com/scellecs/morpeh.git?path=Scellecs.Morpeh#stage-2024.1
    🏷️ Tag: https://github.com/scellecs/morpeh.git?path=Scellecs.Morpeh#2024.1.0

.Net Platform

NuGet package URL: https://www.nuget.org/packages/Scellecs.Morpeh

📖 Introduction

📘 Base concept of ECS pattern

🔖 Entity

An identifier for components, which does not store any data but can be used to access components. Logically, it is similar to a GameObject in Unity, but an Entity does not store any data itself.

It is a value type, and is trivially copyable. Underlying identifiers (IDs) are reused, but each reused ID is guaranteed to have a new generation, making each new Entity unique.

var healthStash = this.World.GetStash<HealthComponent>();
var entity = this.World.CreateEntity();

ref var addedHealthComponent  = ref healthStash.Add(entity);
ref var gottenHealthComponent = ref healthStash.Get(entity);

//if you remove the last entity component, it will be destroyed during the next world.Commit() call
bool removed = healthStash.Remove(entity);
healthStash.Set(entity, new HealthComponent {healthPoints = 100});

bool hasHealthComponent = healthStash.Has(entity);

var debugString = entity.ToString();

//remove entity
this.World.RemoveEntity(entity);

//check disposal
bool isDisposed = this.World.IsDisposed(entity);

//alternatively
bool has = this.World.Has(entity);

🔖 Component

Components are types which store components data. In Morpeh, components are value types for performance purposes.

public struct HealthComponent : IComponent {
    public int healthPoints;
}

🔖 System

Types that process entities with a specific set of components.
Entities are selected using a filter.

All systems are represented by interfaces.

public class HealthSystem : ISystem {
    public World World { get; set; }

    private Filter filter;
    private Stash<HealthComponent> healthStash;

    public void OnAwake() {
        this.filter = this.World.Filter.With<HealthComponent>().Build();
        this.healthStash = this.World.GetStash<HealthComponent>();
    }

    public void OnUpdate(float deltaTime) {
        foreach (var entity in this.filter) {
            ref var healthComponent = ref healthStash.Get(entity);
            healthComponent.healthPoints += 1;
        }
    }

    public void Dispose() {
    }
}

All systems types:

• IInitializer - has OnAwake and Dispose methods only, which is convenient for executing startup logic
• ISystem - main system that executes every frame in Update. Used for main game logic and data processing
• IFixedSystem - system that executes in FixedUpdate with fixed time step
• ILateSystem - system that executes in LateUpdate, after all Updates. Useful for logic that should run after main updates
• ICleanupSystem - system that executes after ILateSystem. Designed for cleanup operations, resetting states, and handling end-of-frame tasks

Beware that ScriptableObject-based systems do still exist in 2024 version, but they are deprecated and will be removed in the future.

🔖 SystemsGroup

The type that contains the systems. Consider them as a "feature" to group the systems by their common purpose.

var newWorld = World.Create();

var newSystem = new HealthSystem();
var newInitializer = new HealthInitializer();

var systemsGroup = newWorld.CreateSystemsGroup();
systemsGroup.AddSystem(newSystem);
systemsGroup.AddInitializer(newInitializer);

//it is a bad practice to turn systems off and on, but sometimes it is very necessary for debugging
systemsGroup.DisableSystem(newSystem);
systemsGroup.EnableSystem(newSystem);

systemsGroup.RemoveSystem(newSystem);
systemsGroup.RemoveInitializer(newInitializer);

newWorld.AddSystemsGroup(order: 0, systemsGroup);
newWorld.RemoveSystemsGroup(systemsGroup);

🔖 World

A type that contains entities, components stashes, systems and root filter.

var newWorld = World.Create();
//a variable that specifies whether the world should be updated automatically by the game engine.
//if set to false, then you can update the world manually.
//and can also be used for game pauses by changing the value of this variable.
newWorld.UpdateByUnity = true;

var newEntity = newWorld.CreateEntity();
newWorld.RemoveEntity(newEntity);

var systemsGroup = newWorld.CreateSystemsGroup();
systemsGroup.AddSystem(new HealthSystem());

newWorld.AddSystemsGroup(order: 0, systemsGroup);
newWorld.RemoveSystemsGroup(systemsGroup);

var filter = newWorld.Filter.With<HealthComponent>();

var healthStash = newWorld.GetStash<HealthComponent>();
var reflectionHealthStash = newWorld.GetReflectionStash(typeof(HealthComponent));

//manually world updates
newWorld.Update(Time.deltaTime);
newWorld.FixedUpdate(Time.fixedDeltaTime);
newWorld.LateUpdate(Time.deltaTime);
newWorld.CleanupUpdate(Time.deltaTime);

//apply all entity changes, filters will be updated.
//automatically invoked between systems
newWorld.Commit();

🔖 Filter

A type that allows filtering entities constrained by conditions With and/or Without.
You can chain them in any order and quantity.
Call Build() to finalize the filter for further use.

var filter = this.World.Filter.With<HealthComponent>()
                              .With<BooComponent>()
                              .Without<DummyComponent>()
                              .Build();

var firstEntityOrException = filter.First();
var firstEntityOrNull = filter.FirstOrDefault();

bool filterIsEmpty = filter.IsEmpty();
bool filterIsNotEmpty = filter.IsNotEmpty();
int filterLengthCalculatedOnCall = filter.GetLengthSlow();

🔖 Stash

A type that stores components data.

var healthStash = this.World.GetStash<HealthComponent>();
var entity = this.World.CreateEntity();

ref var addedHealthComponent  = ref healthStash.Add(entity);
ref var gottenHealthComponent = ref healthStash.Get(entity);

bool removed = healthStash.Remove(entity);

healthStash.Set(entity, new HealthComponent {healthPoints = 100});

bool hasHealthComponent = healthStash.Has(entity);

//delete all HealthComponent from the world (affects all entities)
healthStash.RemoveAll();

bool healthStashIsEmpty = healthStash.IsEmpty();
bool healthStashIsNotEmpty = healthStash.IsNotEmpty();

var newEntity = this.World.CreateEntity();
//transfers a component from one entity to another
healthStash.Migrate(from: entity, to: newEntity);

//not a generic variation of stash, so we can only do a limited set of operations
var reflectionHealthCache = newWorld.GetReflectionStash(typeof(HealthComponent));

//set default(HealthComponent) to entity
reflectionHealthCache.Set(entity);

bool removed = reflectionHealthCache.Remove(entity);

bool hasHealthComponent = reflectionHealthCache.Has(entity);

🅿️ Providers

Morpeh has providers for integration with Unity game engine.
This is a MonoBehaviour that allows you to create associations between GameObject and Entity.
For each ECS component, you can create a provider; it will allow you to change the component values directly through the inspector, use prefabs and use the workflow as close as possible to classic Unity development.

There are two main types of providers.

• EntityProvider. It automatically creates an associated entity and allows you to access it.
• MonoProvider. It is an inheritor of EntityProvider, and adds a component to the entity. Allows you to view and change component values directly in the playmode.

Note

Precisely because providers allow you to work with component values directly from the kernel, because components are not stored in the provider, it only renders them;
We use third-party solutions for rendering inspectors like Tri Inspector or Odin Inspector.
It's a difficult task to render the completely different data that you can put into a component.

All providers do their work in the OnEnable() and OnDisable() methods.
This allows you to emulate turning components on and off, although the kernel does not have such a feature.

All providers are synchronized with each other, so if you attach several providers to one GameObject, they will be associated with one entity, and will not create several different ones.

Providers can be inherited and logic can be overridden in the Initialize() and Deinitialize() methods.
We do not use methods like Awake(), Start() and others, because the provider needs to control the creation of the entity and synchronize with other providers.
At the time of calling Initialize(), the entity is definitely created.

API:

var entityProvider = someGameObject.GetComponent<EntityProvider>();
var entity = entityProvider.Entity;

var monoProvider = someGameObject.GetComponent<MyCustomMonoProvider>();

var entity = monoProvider.Entity;
//returns serialized data or direct value of component
ref var data = ref monoProvider.GetData();
ref var data = ref monoProvider.GetData(out bool existOnEntity);
ref var serializedData = ref monoProvider.GetSerializedData();

var stash = monoProvider.Stash;

We also have one additional provider that allows you to destroy an entity when a GameObject is removed from the scene.
You can simply hang it on a GameObject and no matter how many components are left on the entity, it will be deleted.
The provider is called RemoveEntityOnDestroy.

🌐 World Browser

The WorldBrowser tool enables real-time tracking and searching of entities and their components. Supports the same filtering logic as the core Filter, allowing complex queries using With and Without conditions.

Access it via Tools -> Morpeh -> WorldBrowser.

To declare a query:

• Enter the full component name in the search bar for With conditions.
• Use ! before the component name for Without conditions (e.g. !ComponentName).
• You can paste a complete regular expression directly into the search bar, and it will automatically synchronize with the list of available components.

Alternatively:

• Choose from a synchronized list of available components instead of typing them manually.
• Suggestions appear as you type in the search bar. When you start typing a component name, a list of available components is displayed. You can click on a suggestion to automatically complete the name.

ID search:

• Search by one or multiple entity IDs by entering id: (e.g. id:25 id:145).
• ID-based search overrides any component-based query.

Note

Entity with ID 0 cannot exist, as it's reserved as an invalid entity in the framework.

World Selection:

• Use the top toolbar (with the W icon) to choose worlds to search.
• By default, World.Default is pre-selected.

---

📘 Getting Started

Important

All GIFs are hidden under spoilers. Press ➤ to open it.

First step: install Tri Inspector.
Second step: install Morpeh.

After installation import ScriptTemplates and Restart Unity.

Let's create our first component and open it.

Right click in project window and select Create/ECS/Component.

After it, you will see something like this.

using Scellecs.Morpeh;
using UnityEngine;
using Unity.IL2CPP.CompilerServices;

[Il2CppSetOption(Option.NullChecks, false)]
[Il2CppSetOption(Option.ArrayBoundsChecks, false)]
[Il2CppSetOption(Option.DivideByZeroChecks, false)]
[System.Serializable]
public struct HealthComponent : IComponent {
}

Note

Don't care about attributes.
Il2CppSetOption attribute can give you better performance.
It is important to understand that this disables any checks for null, so in the release build any calls to a null object will lead to a hard crash.
We recommend that in places where you are in doubt about using this attribute, you check everything for null yourself.

Add health points field to the component.

public struct HealthComponent : IComponent {
    public int healthPoints;
}

It is okay.

Now let's create our first system.

Create a new C# class somewhere in your project and give it a name.

Note

You can also create IFixedSystem, ILateSystem and ICleanupSystem.
They are similar to MonoBehaviour's Update, FixedUpdate, LateUpdate. ICleanupSystem is called after all ILateSystem.

A system looks like this:

using Scellecs.Morpeh;
using UnityEngine;
using Unity.IL2CPP.CompilerServices;

[Il2CppSetOption(Option.NullChecks, false)]
[Il2CppSetOption(Option.ArrayBoundsChecks, false)]
[Il2CppSetOption(Option.DivideByZeroChecks, false)]
public sealed class HealthSystem : ISystem {
    public World World { get; set; }
    
    public void OnAwake() {
    }

    public void OnUpdate(float deltaTime) {
    }
    
    public void Dispose() {
    }
}

We have to add a filter to find all the entities with HealthComponent.

public sealed class HealthSystem : ISystem {
    private Filter filter;
    
    public World World { get; set; }
    
    public void OnAwake() {
        this.filter = this.World.Filter.With<HealthComponent>().Build();
    }

    public void OnUpdate(float deltaTime) {
    }
    
    public void Dispose() {
    }
}

Note

You can chain filters by using With<> and Without<> in any order.
For example this.World.Filter.With<FooComponent>().With<BarComponent>().Without<BeeComponent>().Build();

Important

Components are structs and if you want to change their values, then you must use ref. It is recommended to always use ref unless you specifically need a copy of the component.

Now we can iterate over our entities.

public sealed class HealthSystem : ISystem {
    public World World { get; set; }
    
    private Filter filter;
    private Stash<HealthComponent> healthStash;
    
    public void OnAwake() {
        this.filter = this.World.Filter.With<HealthComponent>().Build();
        this.healthStash = this.World.GetStash<HealthComponent>();
    }

    public void OnUpdate(float deltaTime) {
        foreach (var entity in this.filter) {
            ref var healthComponent = ref healthStash.Get(entity);
            Debug.Log(healthComponent.healthPoints);
        }
    }
    
    public void Dispose() {
    }
}

Now we need to add our newly created system to the world. We can do it by creating a SystemGroup and adding the system to it, and then adding the SystemGroup to the world.

World.Default is created for you by default, but you can create your own worlds if you need to separate the logic. Beware that World.Default is updated automatically by the game engine, but you can disable it and update it manually. Custom worlds are not updated automatically, so you need to update them manually.

public class Startup : MonoBehaviour {
    private World world;
    
    private void Start() {
        this.world = World.Default;
        
        var systemsGroup = this.world.CreateSystemsGroup();
        systemsGroup.AddSystem(new HealthSystem());
        
        this.world.AddSystemsGroup(order: 0, systemsGroup);
    }
}

Attach the script to any GameObject and press play.

Nothing happened because we did not create our entities.

We will focus on GameObject-based API because otherwise all you need to do is create an entity with World.CreateEntity(). To do this, we need a provider that associates a GameObject with an entity.

Create a new provider.

Right click the project window and select Create/ECS/Provider.

using Scellecs.Morpeh.Providers;
using Unity.IL2CPP.CompilerServices;

[Il2CppSetOption(Option.NullChecks, false)]
[Il2CppSetOption(Option.ArrayBoundsChecks, false)]
[Il2CppSetOption(Option.DivideByZeroChecks, false)]
public sealed class HealthProvider : MonoProvider<{YOUR_COMPONENT}> {
}

We need to specify a component for the provider.

public sealed class HealthProvider : MonoProvider<HealthComponent> {
}

Create new GameObject and add HealthProvider.

Now press play button, and you will see Debug.Log with healthPoints.
Nice!

---

📖 Advanced

🧩 Filter Extensions

Filter extensions are a way to reuse queries or their parts. Let's look at an example:

Create a struct and implement the IFilterExtension interface.

public struct SomeExtension : IFilterExtension {
    public FilterBuilder Extend(FilterBuilder rootFilter) => rootFilter.With<Translation>().With<Rotation>();
}

The next step is to call the Extend method in any order when requesting a filter.
The Extend method continues query.

private Filter filter;

public void OnAwake() {
    this.filter = this.World.Filter.With<TestA>()
                                   .Extend<SomeExtension>()
                                   .With<TestC>()
                                   .Build();
}

🧹 Filter Disposing

Filter.Dispose allows you to completely remove the filter from the world, as if it never existed there.

Important

Filter.Dispose removes all filter instances across all systems where it was used, not just the instance on which Dispose was called.

🔍 Aspects

An aspect is an object-like wrapper that you can use to group a subset of an entity's components together into a single C# struct. Aspects are useful for organizing components code and simplifying queries in your systems.

For example, the Transform aspect groups together the position, rotation, and scale of components and enables you to access these components from a query that includes the Transform. You can also define your own aspects with the IAspect interface.

Components:

    public struct Translation : IComponent {
        public float x;
        public float y;
        public float z;
    }
    
    public struct Rotation : IComponent {
        public float x;
        public float y;
        public float z;
        public float w;
    }

    public struct Scale : IComponent {
        public float x;
        public float y;
        public float z;
    }

Let's group them in an aspect:

public struct Transform : IAspect {
    //Set on each call of AspectFactory.Get(Entity entity)
    public Entity Entity { get; set; }
    
    private Stash<Translation> translation;
    private Stash<Rotation> rotation;
    private Stash<Scale> scale;
    
    public ref Translation Translation => ref this.translation.Get(this.Entity);
    public ref Rotation Rotation => ref this.rotation.Get(this.Entity);
    public ref Scale Scale => ref this.scale.Get(this.Entity);

    //Called once on world.GetAspectFactory<T>
    public void OnGetAspectFactory(World world) {
        this.translation = world.GetStash<Translation>();
        this.rotation = world.GetStash<Rotation>();
        this.scale = world.GetStash<Scale>();
    }
}

Let's add an IFilterExtension implementation to always have a query.

public struct Transform : IAspect, IFilterExtension {
    public Entity Entity { get; set;}
    
    public ref Translation Translation => ref this.translation.Get(this.Entity);
    public ref Rotation Rotation => ref this.rotation.Get(this.Entity);
    public ref Scale Scale => ref this.scale.Get(this.Entity);
    
    private Stash<Translation> translation;
    private Stash<Rotation> rotation;
    private Stash<Scale> scale;

    public void OnGetAspectFactory(World world) {
        this.translation = world.GetStash<Translation>();
        this.rotation = world.GetStash<Rotation>();
        this.scale = world.GetStash<Scale>();
    }
    public FilterBuilder Extend(FilterBuilder rootFilter) => rootFilter.With<Translation>().With<Rotation>().With<Scale>();
}

Now we write a system that uses our aspect.

public class TransformAspectSystem : ISystem {
    public World World { get; set; }

    private Filter filter;
    private AspectFactory<Transform> transform;
    
    private Stash<Translation> translation;
    private Stash<Rotation> rotation;
    private Stash<Scale> scale;
    
    public void OnAwake() {
        //Extend filter with ready query from Transform
        this.filter = this.World.Filter.Extend<Transform>().Build();
        //Get aspect factory AspectFactory<Transform>
        this.transform = this.World.GetAspectFactory<Transform>();

        
        for (int i = 0, length = 100; i < length; i++) {
            var entity = this.World.CreateEntity();
            
            ref var translationComponent = ref this.translation.Set(entity);
            ref var rotationComponent = ref this.rotation.Set(entity);
            ref var scaleComponent = ref this.scale.Set(entity);
        }
    }
    public void OnUpdate(float deltaTime) {
        foreach (var entity in this.filter) {
            //Getting aspect copy for current entity
            var trs = this.transform.Get(entity);

            ref var trans = ref trs.Translation;
            trans.x += 1;

            ref var rot = ref trs.Rotation;
            rot.x += 1;
            
            ref var scale = ref trs.Scale;
            scale.x += 1;
        }
    }
    
    public void Dispose() {
    }
}

🧹 Component Disposing

Important

Make sure you don't have the MORPEH_DISABLE_COMPONENT_DISPOSE define enabled.

Sometimes it becomes necessary to clear component values. For this, it is enough that a component implements IDisposable. For example:

public struct PlayerView : IComponent, IDisposable {
    public GameObject value;
    
    public void Dispose() {
        Object.Destroy(value);
    }
}

An initializer or a system needs to mark the stash as disposable. For example:

public class PlayerViewDisposeInitializer : IInitializer {
    public void OnAwake() {
        this.World.GetStash<PlayerView>().AsDisposable();
    }
    
    public void Dispose() {
    }
}

or

public class PlayerViewSystem : ISystem {
    public void OnAwake() {
        this.World.GetStash<PlayerView>().AsDisposable();
    }
    
    public void OnUpdate(float deltaTime) {
        ...
    }
    
    public void Dispose() {
    }
}

Now, when the component is removed from an entity, the Dispose() method will be called on the PlayerView component.

🧨 Unity Jobs And Burst

Important

Supported only in Unity. Subjected to further improvements and modifications.

You can convert Filter to NativeFilter which allows you to do component-based manipulations inside a Job.
Conversion of Stash<T> to NativeStash<TNative> allows you to operate on components based on entity ids.

Current limitations:

• NativeFilter and NativeStash and their contents should never be re-used outside of single system tick.
• NativeFilter and NativeStash cannot be used in-between World.Commit() calls inside Morpeh.

Example job scheduling:

public sealed class SomeSystem : ISystem {
    private Filter filter;
    private Stash<HealthComponent> stash;
    ...
    public void OnUpdate(float deltaTime) {
        var nativeFilter = this.filter.AsNative();
        var parallelJob = new ExampleParallelJob {
            entities = nativeFilter,
            healthComponents = stash.AsNative(),
            // Add more native stashes if needed
        };
        var parallelJobHandle = parallelJob.Schedule(nativeFilter.length, 64);
        parallelJobHandle.Complete();
    }
}

Example job:

[BurstCompile]
public struct TestParallelJobReference : IJobParallelFor {
    [ReadOnly]
    public NativeFilter entities;
    public NativeStash<HealthComponent> healthComponents;
        
    public void Execute(int index) {
        var entity = this.entities[index];
        
        ref var component = ref this.healthComponents.Get(entity, out var exists);
        if (exists) {
            component.Value += 1;
        }
        
        // Alternatively, you can avoid checking existance of the component
        // if the filter includes said component anyway
        
        ref var component = ref this.healthComponents.Get(entity);
        component.Value += 1;
    }
}

For flexible Job scheduling, you can use World.JobHandle.
It allows you to schedule Jobs within one SystemsGroup, rather than calling .Complete() directly on the system.
Planning between SystemsGroup is impossible because in Morpeh, unlike Entities or other frameworks, there is no dependency graph that would allow Jobs to be planned among all systems, taking into account dependencies.

Example scheduling:

public sealed class SomeSystem : ISystem {
    private Filter filter;
    private Stash<HealthComponent> stash;
    ...
    public void OnUpdate(float deltaTime) {
        var nativeFilter = this.filter.AsNative();
        var parallelJob = new ExampleParallelJob {
            entities = nativeFilter,
            healthComponents = stash.AsNative()
        };
        World.JobHandle = parallelJob.Schedule(nativeFilter.length, 64, World.JobHandle);
    }
}

World.JobHandle.Complete() is called automatically after each Update type. For example:

• Call OnUpdate() on all systems within the SystemsGroup.
• Call World.JobHandle.Complete().
• Call OnFixedUpdate() on all systems within the SystemsGroup.
• Call World.JobHandle.Complete().

Warning

You cannot change the set of components on any entities if you have scheduled Jobs.
Any addition or deletion of components is considered a change.
The kernel will warn you at World.Commit() that you cannot do this.

You can manually control World.JobHandle, assign it, and call .Complete() on systems if you need to.
Currently Morpeh uses some additional temporary collections for the native part, so instead of just calling World.JobHandle.Complete() we recommend using World.JobsComplete().
This method is optional; the kernel will clear these collections one way or another, it will simply do it later.

🗒️ Defines

Can be set by user:

• MORPEH_DEBUG Define if you need debug in application build. In editor it works automatically.
• MORPEH_EXTERNAL_IL2CPP_ATTRS If you have conflicts with attributes, you can set this define and Morpeh core will be use internal version of attributes.
• MORPEH_PROFILING Define for systems profiling in Unity Profiling Window.
• MORPEH_METRICS Define for additional Morpeh Metrics in Unity Profiling Window.
• MORPEH_NON_SERIALIZED Define to avoid serialization of Morpeh core parts.
• MORPEH_THREAD_SAFETY Define that forces the kernel to validate that all calls come from the same thread the world was created on. The binding to a thread can be changed using the World.GetThreadId(), World.SetThreadId() methods.
• MORPEH_DISABLE_SET_ICONS Define for disabling set icons in Project Window.
• MORPEH_DISABLE_AUTOINITIALIZATION Define for disable default world creation and creating Morpeh Runner GameObject.
• MORPEH_DISABLE_COMPILATION_REPORT Define for disable compilation report in Editor Console.
• MORPEH_DISABLE_COMPONENT_DISPOSE Define to disable component disposing feature. Will be set by framework:
• MORPEH_BURST Determine if Burst is enabled, and framework has enabled Native API.
• MORPEH_GENERATE_ALL_EXTENDED_IDS to generate ExtendedComponentId for all components even outside of Unity Editor.

🌍️ World Plugins

Sometimes you need to make an automatic plugin for the world.
Add some systems, make a custom game loop, or create your own automatic serialization.
World plugins are great for this.

To do this, you need to declare a class that implements the IWorldPlugin interface.
After that, create a static method with an attribute and register the plugin in the kernel.

For example:

class GlobalsWorldPlugin : IWorldPlugin {

    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
    public static void RuntimeInitialize() {
        WorldExtensions.AddWorldPlugin(new GlobalsWorldPlugin());
    }
    
    public void Initialize(World world) {
        var sg = world.CreateSystemsGroup();
        sg.AddSystem(new ECS.ProcessEventsSystem());
        world.AddPluginSystemsGroup(sg);
    }
    
    public void Deinitialize(World world) {
        
    }
}

📊 Metrics

To debug the game, you may need statistics on basic data in the ECS framework, such as:

1. Number of entities
2. Number of archetypes
3. Number of filters
4. Number of systems
5. Number of commits in the world
6. Number of entity migrations
7. Number of stash resizes

You can find all this in the profiler window.
To do this, you need to add the official Unity Profiling Core API package to your project.
Its quick name to search is: com.unity.profiling.core

After this, specify the MORPEH_METRICS definition in the project.
Now you can observe all the statistics for the kernel.

Open the profiler window.
On the top left, click the Profiler Modules button and find Morpeh there.
We turn it on with a checkmark and can move it higher or lower.

Metrics work the same way in debug builds, so you can see the whole picture directly from the device.

It will be look like this in playmode.

📏 Stash size

If you know the expected number of components in a stash, you have the option to set a base size to prevent resizing and avoid unnecessary allocations.

ComponentId<T>.StashSize = 1024;

This value is not tied to a specific World, so it needs to be set before starting ECS, so that all newly created stashes of this type in any World have the specified capacity.

⚙️ Collections

Morpeh provides a small set of custom lightweight collections that perform faster under IL2CPP compared to standard library collections.

FastList

Identical to List, additionally supports RemoveSwapBack operations and provides more control over the internal list structure. Also includes methods that allow bypassing array bounds checking.

IntHashMap & LongHashMap

Identical to Dictionary<int, T> and Dictionary<long, T> respectively, but only supports positive range of keys. Significantly outperforms the dictionary in terms of performance. Allows getting elements by ref. Use combination of foreach and GetValueByIndex/GetValueRefByIndex to iterate over the map.

IntHashSet

Lightweight version of HashSet. Has similar optimizations to IntHashMap but without value storage overhead. Supports only positive range of keys.

BitSet

Optimized lightweight implementation of a bit array, resizes significantly faster.

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🔌 Plugins

• Morpeh Helpers
• Morpeh.Events
• Morpeh.SystemStateProcessor
• Morpeh.Queries
• Morpeh.SourceGenerator
• Morpeh.Addons
• PlayerLoopAPI Runner Morpeh plugin

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📚 Examples

• Tanks by SH42913
• Ping Pong by SH42913
• Flappy Bird by R1nge
• 3D Asteroids by R1nge
• Mobile Runner Hypercasual by StinkySteak

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🔥 Games

• One State RP - Life Simulator by Chillbase
  Android iOS

• FatalZone by Midhard Games
  Steam

• Zombie City by GreenButtonGames
  Android iOS

• Fish Idle by GreenButtonGames
  Android iOS

• Stickman of Wars: RPG Shooters by Multicast Games
  Android iOS

• Alien Invasion: RPG Idle Space by Multicast Games
  Android iOS

• Cowravaneer by FESUNENKO GAMES
  Android

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📘 License

📄 MIT License

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💬 Contacts

✉️ Telegram: olegmrzv
📧 E-Mail: [email protected]
👥 Telegram Community RU: Morpeh ECS Development