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ecs and tranforms

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added the moonworks ecs library.
testing it by setting up a transform and parent system.
This commit is contained in:
max 2024-10-13 00:08:01 +02:00
parent 6f505f34a9
commit 30deeca452
10 changed files with 199 additions and 7 deletions
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3
.gitmodules vendored
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@ -16,3 +16,6 @@
[submodule "Nerfed.Runtime/Libraries/ImGui.NET"]
path = Nerfed.Runtime/Libraries/ImGui.NET
url = https://github.com/ImGuiNET/ImGui.NET.git
[submodule "Nerfed.Runtime/Libraries/ECS"]
path = Nerfed.Runtime/Libraries/ECS
url = https://github.com/MoonsideGames/MoonTools.ECS.git

23
Nerfed.Editor/Program.cs
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@ -1,9 +1,15 @@
using Nerfed.Runtime;
using MoonTools.ECS;
using Nerfed.Runtime;
using Nerfed.Runtime.Systems;
using System.Numerics;
namespace Nerfed.Editor;
internal class Program
{
private static readonly World world = new World();
private static List<MoonTools.ECS.System> systems = new List<MoonTools.ECS.System>();
private static void Main(string[] args)
{
Engine.OnInitialize += HandleOnInitialize;
@ -16,6 +22,16 @@ private static void Main(string[] args)
private static void HandleOnInitialize()
{
systems.Add(new ParentSystem(world));
systems.Add(new TransformSystem(world));
Entity ent1 = world.CreateEntity();
world.Set(ent1, new LocalTransform(new Vector3(1, 0, 0), Quaternion.Identity, Vector3.One));
Entity ent2 = world.CreateEntity();
world.Set(ent2, new LocalTransform(new Vector3(0, 1, 0), Quaternion.Identity, Vector3.One));
world.Set(ent2, new Parent(ent1));
// Open project.
// Setip EditorGui.
EditorGui.Initialize();
@ -23,6 +39,11 @@ private static void HandleOnInitialize()
private static void HandleOnUpdate()
{
foreach (MoonTools.ECS.System system in systems)
{
system.Update(Engine.Timestep);
}
// Editor Update.
EditorGui.Update();

6
Nerfed.Runtime/Components/LocalToWorld.cs Normal file
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@ -0,0 +1,6 @@
using System.Numerics;
namespace Nerfed.Runtime.Components
{
public readonly record struct LocalToWorld(Matrix4x4 localToWorldMatrix);
}

18
Nerfed.Runtime/Components/LocalTransform.cs Normal file
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@ -0,0 +1,18 @@
using System.Numerics;
namespace Nerfed.Runtime.Components
{
public struct LocalTransform
{
public Vector3 position;
public Quaternion rotation;
public Vector3 scale;
public LocalTransform(Vector3 position, Quaternion rotation, Vector3 scale)
{
this.position = position;
this.rotation = rotation;
this.scale = scale;
}
}
}

8
Nerfed.Runtime/Components/Parent.cs Normal file
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@ -0,0 +1,8 @@
using MoonTools.ECS;
namespace Nerfed.Runtime.Components
{
public readonly record struct Parent(Entity parentEntity);
public readonly record struct PreviousParent(Entity parentEntity);
public readonly record struct ChildRelation;
}

1
Nerfed.Runtime/Libraries/ECS Submodule

@ -0,0 +1 @@
Subproject commit 76b18a6ba9a33f5a93022390be7ed805f9f722e8

13
Nerfed.Runtime/Nerfed.Runtime.csproj
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@ -32,12 +32,13 @@
</PropertyGroup>
<ItemGroup>
<Compile Include="Libraries\SDL2CS\src\SDL2.cs"/>
<Compile Include="Libraries\RefreshCS\RefreshCS.cs"/>
<Compile Include="Libraries\FAudio\csharp\FAudio.cs"/>
<Compile Include="Libraries\WellspringCS\WellspringCS.cs"/>
<Compile Include="Libraries\dav1dfile\csharp\dav1dfile.cs"/>
<Compile Include="Libraries\ImGui.NET\src\ImGui.NET\**\*.cs"/>
<Compile Include="Libraries\ECS\src\**\*.cs" />
<Compile Include="Libraries\SDL2CS\src\SDL2.cs" />
<Compile Include="Libraries\RefreshCS\RefreshCS.cs" />
<Compile Include="Libraries\FAudio\csharp\FAudio.cs" />
<Compile Include="Libraries\WellspringCS\WellspringCS.cs" />
<Compile Include="Libraries\dav1dfile\csharp\dav1dfile.cs" />
<Compile Include="Libraries\ImGui.NET\src\ImGui.NET\**\*.cs" />
</ItemGroup>
</Project>

62
Nerfed.Runtime/Systems/ParentSystem.cs Normal file
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@ -0,0 +1,62 @@
using MoonTools.ECS;
using Nerfed.Runtime.Components;
namespace Nerfed.Runtime.Systems
{
public class ParentSystem : MoonTools.ECS.System
{
private readonly Filter parentsAddedFilter;
private readonly Filter parentsRemovedFilter;
private readonly Filter parentsFilter;
public ParentSystem(World world) : base(world)
{
parentsAddedFilter = FilterBuilder.Include<Parent>().Exclude<PreviousParent>().Build();
parentsRemovedFilter = FilterBuilder.Include<PreviousParent>().Exclude<Parent>().Build();
parentsFilter = FilterBuilder.Include<Parent>().Include<PreviousParent>().Build();
}
public override void Update(TimeSpan delta)
{
// Update removed parents.
foreach (Entity entity in parentsRemovedFilter.Entities)
{
// Do stuff here to update/remove child relations etc.
PreviousParent previousParent = Get<PreviousParent>(entity);
World.Unrelate<ChildRelation>(previousParent.parentEntity, entity);
Remove<PreviousParent>(entity);
}
// Update added parents.
foreach (Entity entity in parentsAddedFilter.Entities)
{
Parent parent = Get<Parent>(entity);
if (Has<Parent>(parent.parentEntity) && Get<Parent>(parent.parentEntity).parentEntity == entity)
{
Log.Warning($"Entity {entity} cannot be a parent of entity {parent.parentEntity}, because {parent.parentEntity} is the parent of {entity}");
Remove<Parent>(entity);
continue;
}
PreviousParent previousParent = new(parent.parentEntity);
Set(entity, previousParent);
World.Relate(parent.parentEntity, entity, new ChildRelation());
}
// Update relations if the parent has changed.
foreach (Entity entity in parentsFilter.Entities)
{
Parent parent = Get<Parent>(entity);
PreviousParent previousParent = Get<PreviousParent>(entity);
if(parent.parentEntity != previousParent.parentEntity)
{
World.Unrelate<ChildRelation>(previousParent.parentEntity, entity);
Set(entity, new PreviousParent(parent.parentEntity));
World.Relate(parent.parentEntity, entity, new ChildRelation());
}
}
}
}
}

47
Nerfed.Runtime/Systems/TransformSystem.cs Normal file
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@ -0,0 +1,47 @@
using MoonTools.ECS;
using Nerfed.Runtime.Components;
using Nerfed.Runtime.Util;
using System.Numerics;
namespace Nerfed.Runtime.Systems
{
public class TransformSystem : MoonTools.ECS.System
{
private readonly Filter rootEntitiesFilter;
public TransformSystem(World world) : base(world)
{
rootEntitiesFilter = FilterBuilder.Include<LocalTransform>().Exclude<Parent>().Build();
}
public override void Update(TimeSpan delta)
{
Matrix4x4 rootMatrix = Matrix4x4.Identity;
foreach (Entity entity in rootEntitiesFilter.Entities)
{
UpdateWorldTransform(entity, rootMatrix);
}
}
private void UpdateWorldTransform(in Entity entity, in Matrix4x4 parentLocalToWorld)
{
// TODO: Only update dirty transforms.
// Maybe store the local transform matrix.
// If something is dirty all the children need to update their localToWorld matrix.
LocalTransform localTransform = Get<LocalTransform>(entity);
Matrix4x4 localToWorldMatrix = Matrix4x4.Multiply(parentLocalToWorld, localTransform.TRS());
LocalToWorld localToWorld = new(localToWorldMatrix);
Set(entity, localToWorld);
Log.Info($"Entity {entity} | local position {localTransform.position} | world position {localToWorldMatrix.Translation}");
ReverseSpanEnumerator<Entity> childEntities = World.OutRelations<ChildRelation>(entity);
foreach (Entity childEntity in childEntities)
{
UpdateWorldTransform(childEntity, localToWorldMatrix);
}
}
}
}

25
Nerfed.Runtime/Util/Transform.cs Normal file
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@ -0,0 +1,25 @@
using Nerfed.Runtime.Components;
using System.Numerics;
namespace Nerfed.Runtime.Util
{
// https://github.com/needle-mirror/com.unity.entities/blob/master/Unity.Transforms/TransformHelpers.cs
internal static class Transform
{
public static Vector3 Forward(in this Matrix4x4 matrix) => new Vector3(matrix.M31, matrix.M32, matrix.M33);
public static Vector3 Back(in this Matrix4x4 matrix) => -matrix.Forward();
public static Vector3 Up(in this Matrix4x4 matrix) => new Vector3(matrix.M21, matrix.M22, matrix.M23);
public static Vector3 Down(in this Matrix4x4 matrix) => -matrix.Up();
public static Vector3 Right(in this Matrix4x4 matrix) => new Vector3(matrix.M11, matrix.M12, matrix.M13);
public static Vector3 Left(in this Matrix4x4 matrix) => -matrix.Right();
//public static Vector3 Translation(in this Matrix4x4 matrix) => new Vector3();
//public static Quaternion Rotation(in this Matrix4x4 matrix) => new Quaternion();
public static Matrix4x4 TRS(in this LocalTransform localTransform)
{
return Matrix4x4.CreateScale(localTransform.scale) *
Matrix4x4.CreateFromQuaternion(localTransform.rotation) *
Matrix4x4.CreateTranslation(localTransform.position);
}
}
}