initial

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 CodeWriter Packages
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,2 +1,50 @@
-# Morpeh.Events
-Events for Morpeh ECS
+# Morpeh.Events [![Github license](https://img.shields.io/github/license/codewriter-packages/Morpeh.Events.svg?style=flat-square)](#) [![Unity 2020.1](https://img.shields.io/badge/Unity-2020.1+-2296F3.svg?style=flat-square)](#) ![GitHub package.json version](https://img.shields.io/github/package-json/v/codewriter-packages/Morpeh.Events?style=flat-square)
+_Events for Morpeh ECS_
+
+## How to use?
+
+```csharp
+using System;
+using Scellecs.Morpeh;
+using Scellecs.Morpeh.Systems;
+
+[Serializable]
+public struct DamageRequestedEvent : IEventData {
+    public EntityId targetEntityId;
+}
+
+[Serializable]
+public struct DamagedEvent : IEventData {
+    public EntityId targetEntityId;
+}
+
+public class DamageSystem : UpdateSystem {
+    private Event<DamageRequestedEvent> damageRequestedEvent;
+    private Event<DamagedEvent> damagedEvent;
+
+    public override void OnAwake() {
+        damageRequestedEvent = World.GetEvent<DamageRequestedEvent>();
+        damagedEvent = World.GetEvent<DamagedEvent>();
+    }
+
+    public override void OnUpdate(float deltaTime) {
+        if (!damageRequestedEvent.IsPublished) {
+            return;
+        }
+
+        foreach (var evt in damageRequestedEvent.BatchedChanges) {
+            ApplyDamage(evt.targetEntityId);
+
+            damagedEvent.NextFrame(new DamagedEvent {
+                targetEntityId = evt.targetEntityId,
+            });
+        }
+    }
+
+    private void ApplyDamage(EntityId target) { }
+}
+```
+
+## License
+
+Morpeh.Events is [MIT licensed](./LICENSE.md).

Scellecs.Morpeh/Event.cs

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+using System;
+using JetBrains.Annotations;
+using Scellecs.Morpeh.Collections;
+
+namespace Scellecs.Morpeh
+{
+    public class Event<TData> : IEventInternal where TData : struct, IEventData
+    {
+        private readonly EventRegistry _registry;
+
+        [PublicAPI] public FastList<TData> BatchedChanges { get; } = new FastList<TData>();
+        [PublicAPI] public FastList<TData> ScheduledChanges { get; } = new FastList<TData>();
+
+        [PublicAPI] public bool IsPublished { get; private set; }
+        [PublicAPI] public bool IsScheduled { get; private set; }
+
+        internal event Action<FastList<TData>> Callback;
+
+        internal Event(EventRegistry registry)
+        {
+            _registry = registry;
+        }
+
+        [PublicAPI]
+        public void NextFrame(TData data)
+        {
+            ScheduledChanges.Add(data);
+
+            if (!IsPublished && !IsScheduled)
+            {
+                _registry.DispatchedEvents.Add(this);
+            }
+
+            IsScheduled = true;
+        }
+
+        [PublicAPI]
+        public IDisposable Subscribe(Action<FastList<TData>> callback)
+        {
+            return new Subscription(this, callback);
+        }
+
+        internal class Subscription : IDisposable
+        {
+            private readonly Event<TData> _owner;
+            private readonly Action<FastList<TData>> _callback;
+
+            public Subscription(Event<TData> owner, Action<FastList<TData>> callback)
+            {
+                _owner = owner;
+                _callback = callback;
+
+                _owner.Callback += _callback;
+            }
+
+            public void Dispose()
+            {
+                _owner.Callback -= _callback;
+            }
+        }
+
+        public void OnFrameEnd()
+        {
+            if (IsPublished)
+            {
+                Callback?.Invoke(BatchedChanges);
+
+                IsPublished = false;
+                BatchedChanges.Clear();
+            }
+
+            if (IsScheduled)
+            {
+                IsPublished = true;
+                IsScheduled = false;
+                BatchedChanges.AddListRange(ScheduledChanges);
+                ScheduledChanges.Clear();
+
+                _registry.DispatchedEvents.Add(this);
+            }
+        }
+    }
+
+    public interface IEventInternal
+    {
+        void OnFrameEnd();
+    }
+}

Scellecs.Morpeh/EventIdentifier.cs

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+using System.Threading;
+
+namespace Scellecs.Morpeh
+{
+    internal class EventIdentifier<TData> where TData : struct, IEventData
+    {
+        public static int identifier;
+
+        static EventIdentifier()
+        {
+            identifier = CommonEventIdentifier.GetID();
+        }
+    }
+
+    internal class CommonEventIdentifier
+    {
+        private static int _counter;
+
+        public static int GetID()
+        {
+            return Interlocked.Increment(ref _counter);
+        }
+    }
+}

Scellecs.Morpeh/EventRegistry.cs

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+using Scellecs.Morpeh.Collections;
+
+namespace Scellecs.Morpeh
+{
+    internal class EventRegistry
+    {
+        internal readonly IntHashMap<IEventInternal> RegisteredEvents = new IntHashMap<IEventInternal>();
+
+        internal FastList<IEventInternal> DispatchedEvents = new FastList<IEventInternal>();
+        internal FastList<IEventInternal> ExecutingEvents = new FastList<IEventInternal>();
+    }
+}

Scellecs.Morpeh/EventWorldExtensions.cs

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+using JetBrains.Annotations;
+using Scellecs.Morpeh.Collections;
+
+namespace Scellecs.Morpeh
+{
+    public static class EventWorldExtensions
+    {
+        private static readonly IntHashMap<EventRegistry> Registries = new IntHashMap<EventRegistry>();
+
+        [PublicAPI]
+        public static Event<TData> GetEvent<TData>(this World world)
+            where TData : struct, IEventData
+        {
+            var worldIdentifier = world.identifier;
+            var eventIdentifier = EventIdentifier<TData>.identifier;
+
+            if (!Registries.TryGetValue(worldIdentifier, out var registry))
+            {
+                registry = new EventRegistry();
+
+                var eventSystemGroup = world.CreateSystemsGroup();
+                eventSystemGroup.AddSystem(new ProcessEventsSystem(registry));
+                world.AddSystemsGroup(9999, eventSystemGroup);
+
+                Registries.Add(worldIdentifier, registry, out _);
+            }
+
+            if (!registry.RegisteredEvents.TryGetValue(eventIdentifier, out var registeredEvent))
+            {
+                registeredEvent = new Event<TData>(registry);
+
+                registry.RegisteredEvents.Add(eventIdentifier, registeredEvent, out _);
+            }
+
+            return (Event<TData>) registeredEvent;
+        }
+    }
+}

Scellecs.Morpeh/IEventData.cs

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+namespace Scellecs.Morpeh
+{
+    public interface IEventData
+    {
+    }
+}

Scellecs.Morpeh/ProcessEventsSystem.cs

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+using Scellecs.Morpeh.Collections;
+
+namespace Scellecs.Morpeh
+{
+    internal sealed class ProcessEventsSystem : ICleanupSystem
+    {
+        private readonly EventRegistry _registry;
+
+        public World World { get; set; }
+
+        public ProcessEventsSystem(EventRegistry registry)
+        {
+            _registry = registry;
+        }
+
+        public void OnAwake()
+        {
+        }
+
+        public void Dispose()
+        {
+        }
+
+        public void OnUpdate(float deltaTime)
+        {
+            var list = _registry.DispatchedEvents;
+            if (list.length == 0)
+            {
+                return;
+            }
+
+            _registry.DispatchedEvents = _registry.ExecutingEvents;
+            _registry.ExecutingEvents = list;
+
+            foreach (var evt in list)
+            {
+                evt.OnFrameEnd();
+            }
+
+            list.Clear();
+        }
+    }
+}

Scellecs.Morpeh/Scellecs.Morpeh.asmref

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+{
+    "reference": "Scellecs.Morpeh"
+}

package.json

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+{
+  "name": "com.codewriter.morpeh.events",
+  "displayName": "Morpeh.Events",
+  "description": "Events for Morpeh ECS",
+  "version": "1.0.0",
+  "unity": "2020.1",
+  "license": "MIT",
+  "author": "CodeWriter (https://github.com/orgs/codewriter-packages)",
+  "dependencies": {}
+}