fix broken test

add dt and alpha params to renderers
Mega Refactor (#20 )
2021-03-23 17:50:05 -07:00 · 2021-03-23 17:37:47 -07:00 · 2021-03-12 08:25:25 +00:00 · 2021-01-30 01:09:35 +00:00 · 2021-01-29 17:04:13 -08:00 · 2021-01-30 00:36:42 +00:00
48 changed files with 995 additions and 1220 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -7,13 +7,13 @@

    steps:
    - name: test
-      image: mcr.microsoft.com/dotnet/core/sdk:3.1
+      image: mcr.microsoft.com/dotnet/sdk:5.0.102-ca-patch-buster-slim
      commands:
        - dotnet build -c Release
        - dotnet test -c Release

    - name: deploy
-      image: mcr.microsoft.com/dotnet/core/sdk:3.1
+      image: mcr.microsoft.com/dotnet/sdk:5.0.102-ca-patch-buster-slim
      environment:
        API_KEY:
          from_secret: API_KEY
--- a/424
+++ b/424
@ -1,415 +1,19 @@
 encompass-cs
-Copyright Evan Hemsley 2019

-COOPERATIVE SOFTWARE LICENSE
+Copyright (c) 2020 Evan Hemsley <evan@moonside.games>

-THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS
-COPYFARLEFT PUBLIC LICENSE ("LICENSE"). THE WORK IS PROTECTED BY
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-AND CONDITIONS OF THIS LICENSE.
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+arising from the use of this software.

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-          h. The rights granted under, and the subject matter referenced,
-          in this License were drafted utilizing the terminology of the
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-          Works (as amended on September 28, 1979), the Rome Convention of
-          1961, the WIPO Copyright Treaty of 1996, the WIPO Performances
-          and Phonograms Treaty of 1996 and the Universal Copyright
-          Convention (as revised on July 24, 1971). These rights and
-          subject matter take effect in the relevant jurisdiction in which
-          the License terms are sought to be enforced according to the
-          corresponding provisions of the implementation of those treaty
-          provisions in the applicable national law. If the standard suite
-          of rights granted under applicable copyright law includes
-          additional rights not granted under this License, such
-          additional rights are deemed to be included in the License; this
-          License is not intended to restrict the license of any rights
-          under applicable law.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:

+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
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+2. Altered source versions must be plainly marked as such, and must not be
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+3. This notice may not be removed or altered from any source distribution.
--- a/7
+++ b/7
@ -1,7 +0,0 @@
- immutable component system?
-
- method to remove all components of a type without destroying Entities
- method to remove a component of a type without destroying entity
-
- look at test coverage
- docs
--- a/encompass-cs.sln
+++ b/encompass-cs.sln
@ -1,7 +1,7 @@

 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.26124.0
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30717.126
 MinimumVisualStudioVersion = 15.0.26124.0
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "encompass-cs", "encompass-cs\encompass-cs.csproj", "{B862FC25-0740-4CEA-BC53-3C5F43DCD985}"
 EndProject
@ -9,38 +9,28 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "test", "test\test.csproj",
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
 		Debug|x64 = Debug|x64
 		Debug|x86 = Debug|x86
-		Release|Any CPU = Release|Any CPU
 		Release|x64 = Release|x64
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x64.Build.0 = Debug|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x86.Build.0 = Debug|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|Any CPU.Build.0 = Release|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x64.ActiveCfg = Release|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x64.Build.0 = Release|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x86.ActiveCfg = Release|Any CPU
-		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x86.Build.0 = Release|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x64.Build.0 = Debug|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x86.Build.0 = Debug|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|Any CPU.Build.0 = Release|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x64.ActiveCfg = Release|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x64.Build.0 = Release|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x86.ActiveCfg = Release|Any CPU
-		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x86.Build.0 = Release|Any CPU
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x64.ActiveCfg = Debug|x64
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x64.Build.0 = Debug|x64
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x86.ActiveCfg = Debug|x86
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Debug|x86.Build.0 = Debug|x86
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x64.ActiveCfg = Release|x64
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x64.Build.0 = Release|x64
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x86.ActiveCfg = Release|x86
+		{B862FC25-0740-4CEA-BC53-3C5F43DCD985}.Release|x86.Build.0 = Release|x86
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x64.ActiveCfg = Debug|x64
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x64.Build.0 = Debug|x64
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x86.ActiveCfg = Debug|x86
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Debug|x86.Build.0 = Debug|x86
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x64.ActiveCfg = Release|x64
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x64.Build.0 = Release|x64
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x86.ActiveCfg = Release|x86
+		{23D6C29C-A310-4D3E-8455-8D0B8CA1FC06}.Release|x86.Build.0 = Release|x86
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/encompass-cs/Attributes/Adds.cs
+++ b/encompass-cs/Attributes/Adds.cs
@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+
+namespace Encompass
+{
+    [AttributeUsage(AttributeTargets.Class)]
+    public class Adds : Attribute
+    {
+        public readonly HashSet<Type> addTypes;
+
+        public Adds(params Type[] addTypes)
+        {
+            this.addTypes = new HashSet<Type>(addTypes);
+        }
+    }
+}
--- a/encompass-cs/Attributes/QueryWith.cs
+++ b/encompass-cs/Attributes/QueryWith.cs
@ -1,7 +1,6 @@
 using Encompass.Exceptions;
 using System;
 using System.Collections.Generic;
-using System.Linq;

 namespace Encompass
 {
--- a/encompass-cs/Attributes/QueryWithout.cs
+++ b/encompass-cs/Attributes/QueryWithout.cs
@ -1,7 +1,5 @@
-using Encompass.Exceptions;
-using System;
+using System;
 using System.Collections.Generic;
-using System.Linq;

 namespace Encompass
 {
--- a/encompass-cs/Attributes/Reads.cs
+++ b/encompass-cs/Attributes/Reads.cs
@ -1,7 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using Encompass.Exceptions;

 namespace Encompass
 {
--- a/encompass-cs/Attributes/Receives.cs
+++ b/encompass-cs/Attributes/Receives.cs
@ -1,7 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using Encompass.Exceptions;

 namespace Encompass
 {
@ -12,15 +10,6 @@ namespace Encompass

        public Receives(params Type[] receiveTypes)
        {
-            foreach (var receiveType in receiveTypes)
-            {
-                var isMessage = receiveType.GetInterfaces().Contains(typeof(IMessage));
-                if (!isMessage)
-                {
-                    throw new IllegalSendTypeException("{0} must be a Message", receiveType.Name);
-                }
-            }
-
            ReceiveTypes = new HashSet<Type>(receiveTypes);
        }
    }
--- a/encompass-cs/Attributes/Sends.cs
+++ b/encompass-cs/Attributes/Sends.cs
@ -1,7 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using Encompass.Exceptions;

 namespace Encompass
 {
@ -12,15 +10,6 @@ namespace Encompass

        public Sends(params Type[] sendTypes)
        {
-            foreach (var sendType in sendTypes)
-            {
-                var isMessage = sendType.GetInterfaces().Contains(typeof(IMessage));
-                if (!isMessage)
-                {
-                    throw new IllegalSendTypeException("{0} must be a Message", sendType.Name);
-                }
-            }
-
            this.SendTypes = new HashSet<Type>(sendTypes);
        }
    }
--- a/encompass-cs/Attributes/Writes.cs
+++ b/encompass-cs/Attributes/Writes.cs
@ -1,7 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
-using Encompass.Exceptions;

 namespace Encompass
 {
--- a/encompass-cs/Collections/BitSet512.cs
+++ b/encompass-cs/Collections/BitSet512.cs
@ -0,0 +1,156 @@
+using System;
+
+namespace Encompass
+{
+    public static unsafe class MemoryHelper
+    {
+        public static void Copy(uint* src, uint* dest, int count)
+        {
+            for (; count != 0; count--) *dest++ = *src++;
+        }
+
+        public static void Fill(uint* p, int count, uint value)
+        {
+            for (; count != 0; count--) *p++ = value;
+        }
+
+        public static void And(uint* p, uint* q, uint* result, int count)
+        {
+            for (; count != 0; count--) *result++ = *p++ & *q++;
+        }
+
+        public static void Or(uint* p, uint* q, uint* result, int count)
+        {
+            for (; count != 0; count--) *result++ = *p++ | *q++;
+        }
+
+        public static void Not(uint* p, uint* result, int count)
+        {
+            for (; count != 0; count--) *result++ = ~*p++;
+        }
+
+        public static bool Equal(uint* p, uint* q, int count)
+        {
+            for (; count != 0; count--) if (*p++ != *q++) { return false;  }
+            return true;
+        }
+    }
+
+    public unsafe struct BitSet512 : IEquatable<BitSet512>
+    {
+        public static BitSet512 Zero { get; } = new BitSet512(0);
+        public static BitSet512 Ones { get; } = new BitSet512(uint.MaxValue);
+
+        private const int _uintLength = 16;
+
+        private fixed uint _buffer[_uintLength];
+
+        public BitSet512(uint value)
+        {
+            fixed (uint* p = _buffer) MemoryHelper.Fill(p, _uintLength, value);
+        }
+
+        public BitSet512(uint* src)
+        {
+            fixed (uint* dest = _buffer) MemoryHelper.Copy(src, dest, _uintLength);
+        }
+
+        public static BitSet512 operator &(BitSet512 a, BitSet512 b)
+        {
+            var tmp = stackalloc uint[_uintLength];
+            MemoryHelper.And(a._buffer, b._buffer, tmp, _uintLength);
+            return new BitSet512(tmp);
+        }
+
+        public static BitSet512 operator |(BitSet512 a, BitSet512 b)
+        {
+            var tmp = stackalloc uint[_uintLength];
+            MemoryHelper.Or(a._buffer, b._buffer, tmp, _uintLength);
+            return new BitSet512(tmp);
+        }
+
+        public static BitSet512 operator ~(BitSet512 a)
+        {
+            var tmp = stackalloc uint[_uintLength];
+            MemoryHelper.Not(a._buffer, tmp, _uintLength);
+            return new BitSet512(tmp);
+        }
+
+        public static bool operator ==(BitSet512 left, BitSet512 right)
+        {
+            return left.Equals(right);
+        }
+
+        public static bool operator !=(BitSet512 left, BitSet512 right)
+        {
+            return !(left == right);
+        }
+
+        public BitSet512 Set(int index)
+        {
+            var tmp = stackalloc uint[_uintLength];
+            fixed (uint* p = _buffer) MemoryHelper.Copy(p, tmp, _uintLength);
+            tmp[index / 32] |= (uint)(1 << index % 32);
+            return new BitSet512(tmp);
+        }
+
+        public BitSet512 UnSet(int index)
+        {
+            var tmp = stackalloc uint[_uintLength];
+            fixed (uint* p = _buffer) MemoryHelper.Copy(p, tmp, _uintLength);
+            tmp[index / 32] &= ~(uint)(1 << index % 32);
+            return new BitSet512(tmp);
+        }
+
+        public bool Get(int bitIndex)
+        {
+            var bitInt = (uint)(1 << bitIndex % 32);
+            return (_buffer[bitIndex / 32] & bitInt) == bitInt;
+        }
+
+        public bool AllTrue()
+        {
+            return this == Ones;
+        }
+
+        public bool AllFalse()
+        {
+            return this == Zero;
+        }
+
+        public static BitSet512 BitwiseAnd(BitSet512 left, BitSet512 right)
+        {
+            return left & right;
+        }
+
+        public static BitSet512 BitwiseOr(BitSet512 left, BitSet512 right)
+        {
+            return left | right;
+        }
+
+        public static BitSet512 OnesComplement(BitSet512 bitSet)
+        {
+            return ~bitSet;
+        }
+
+        public override bool Equals(object obj)
+        {
+            return obj is BitSet512 set && Equals(set);
+        }
+
+        public bool Equals(BitSet512 other)
+        {
+            fixed (uint* p = _buffer) return MemoryHelper.Equal(p, other._buffer, _uintLength);
+        }
+
+        public override int GetHashCode()
+        {
+            var hc = 0;
+            for (var i = 0; i < _uintLength; i++)
+            {
+                hc ^= _buffer[i].GetHashCode();
+            }
+            return hc;
+        }
+    }
+}
--- a/encompass-cs/Collections/ComponentBitSet.cs
+++ b/encompass-cs/Collections/ComponentBitSet.cs
@ -1,4 +1,3 @@
-using MoonTools.FastCollections;
 using System;
 using System.Collections.Generic;

--- a/encompass-cs/Collections/ComponentDeltaStore.cs
+++ b/encompass-cs/Collections/ComponentDeltaStore.cs
@ -74,7 +74,7 @@ namespace Encompass
            }
        }

-        public Span<Entity> AllEntities<TComponent>() where TComponent : struct
+        public ReadOnlySpan<Entity> AllEntities<TComponent>() where TComponent : struct
        {
            return _store.AllEntities<TComponent>();
        }
--- a/encompass-cs/Collections/ComponentStore.cs
+++ b/encompass-cs/Collections/ComponentStore.cs
@ -1,4 +1,4 @@
-using MoonTools.FastCollections;
+using Encompass.Exceptions;
 using System;
 using System.Collections.Generic;

@ -54,11 +54,15 @@ namespace Encompass

        public ref readonly TComponent Singular<TComponent>() where TComponent : struct
        {
+            if (!Any<TComponent>()) { throw new NoComponentOfTypeException("No component of type {0} exists", typeof(TComponent).Name); }
+
            return ref Lookup<TComponent>().Singular();
        }

        public ref readonly Entity SingularEntity<TComponent>() where TComponent : struct
        {
+            if (!Any<TComponent>()) { throw new NoComponentOfTypeException("No component of type {0} exists", typeof(TComponent).Name); }
+
            return ref Lookup<TComponent>().SingularEntity();
        }

@ -108,16 +112,26 @@ namespace Encompass
            return Lookup<TComponent>().Count > 0;
        }

-        public Span<TComponent> All<TComponent>() where TComponent : struct
+        public ReadOnlySpan<TComponent> All<TComponent>() where TComponent : struct
        {
            return Lookup<TComponent>().AllComponents();
        }

-        public Span<Entity> AllEntities<TComponent>() where TComponent : struct
+        public IEnumerable<TComponent> AllAsEnumerable<TComponent>() where TComponent : struct
+        {
+            return Lookup<TComponent>().AllComponentsAsEnumerable();
+        }
+
+        public ReadOnlySpan<Entity> AllEntities<TComponent>() where TComponent : struct
        {
            return Lookup<TComponent>().AllEntities();
        }

+        public IEnumerable<Entity> AllEntitiesAsEnumerable<TComponent>() where TComponent : struct
+        {
+            return Lookup<TComponent>().AllEntitiesAsEnumerable();
+        }
+
        public void Clear<TComponent>() where TComponent : struct
        {
            Lookup<TComponent>().Clear();
--- a/encompass-cs/Collections/MessageStore.cs
+++ b/encompass-cs/Collections/MessageStore.cs
@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using Encompass.Exceptions;

 namespace Encompass
 {
@ -7,58 +8,60 @@ namespace Encompass
    {
        private readonly Dictionary<Type, TypedMessageStore> _stores = new Dictionary<Type, TypedMessageStore>(512);

-        private void RegisterMessageType<TMessage>() where TMessage : struct, IMessage
+        private void RegisterMessageType<TMessage>() where TMessage : struct
        {
            _stores.Add(typeof(TMessage), new TypedMessageStore<TMessage>());
        }

-        private TypedMessageStore<TMessage> Lookup<TMessage>() where TMessage : struct, IMessage
+        private TypedMessageStore<TMessage> Lookup<TMessage>() where TMessage : struct
        {
            if (!_stores.ContainsKey(typeof(TMessage))) { RegisterMessageType<TMessage>(); }
            return _stores[typeof(TMessage)] as TypedMessageStore<TMessage>;
        }

-        public void AddMessage<TMessage>(in TMessage message) where TMessage : struct, IMessage
+        public void AddMessage<TMessage>(in TMessage message) where TMessage : struct
        {
            Lookup<TMessage>().Add(message);
        }

-        public void AddMessage<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        public void AddMessage<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            Lookup<TMessage>().Add(message, time);
        }

-        public void AddMessageIgnoringTimeDilation<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        public void AddMessageIgnoringTimeDilation<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            Lookup<TMessage>().AddIgnoringTimeDilation(message, time);
        }

-        public ref readonly TMessage First<TMessage>() where TMessage : struct, IMessage
+        public ref readonly TMessage First<TMessage>() where TMessage : struct
        {
+            if (!Any<TMessage>()) { throw new NoMessageOfTypeException("No Message of type {0} exists", typeof(TMessage).Name); }
+
            return ref Lookup<TMessage>().First();
        }

-        public Span<TMessage> All<TMessage>() where TMessage : struct, IMessage
+        public ReadOnlySpan<TMessage> All<TMessage>() where TMessage : struct
        {
            return Lookup<TMessage>().All();
        }

-        public bool Any<TMessage>() where TMessage : struct, IMessage
+        public bool Any<TMessage>() where TMessage : struct
        {
            return Lookup<TMessage>().Any();
        }

-        public IEnumerable<TMessage> WithEntity<TMessage>(int entityID) where TMessage : struct, IMessage, IHasEntity
+        public IEnumerable<TMessage> WithEntity<TMessage>(int entityID) where TMessage : struct, IHasEntity
        {
            return Lookup<TMessage>().WithEntity(entityID);
        }

-        public ref readonly TMessage FirstWithEntity<TMessage>(int entityID) where TMessage : struct, IMessage
+        public ref readonly TMessage FirstWithEntity<TMessage>(int entityID) where TMessage : struct
        {
            return ref Lookup<TMessage>().FirstWithEntity(entityID);
        }

-        public bool SomeWithEntity<TMessage>(int entityID) where TMessage : struct, IMessage, IHasEntity
+        public bool SomeWithEntity<TMessage>(int entityID) where TMessage : struct, IHasEntity
        {
            return Lookup<TMessage>().SomeWithEntity(entityID);
        }
--- a/encompass-cs/Collections/TypedComponentStore.cs
+++ b/encompass-cs/Collections/TypedComponentStore.cs
@ -78,8 +78,8 @@ namespace Encompass
        {
            if (!_priorities.ContainsKey(entityID) || priority <= _priorities[entityID]) // if priorities are equal that means it's the same engine
            {
-                _priorities[entityID] = priority;
                ForceRemove(entityID);
+                _priorities[entityID] = priority;
                return true;
            }

@ -92,7 +92,6 @@ namespace Encompass
            {
                var storageIndex = _entityIDToStorageIndex[entityID];
                _entityIDToStorageIndex.Remove(entityID);
-                _priorities.Remove(entityID);

                // move a component into the hole to maintain contiguous memory
                if (_nextID > 1 && storageIndex != _nextID - 1)
@ -127,14 +126,24 @@ namespace Encompass
            _priorities.Clear();
        }

-        public Span<Entity> AllEntities()
+        public ReadOnlySpan<Entity> AllEntities()
        {
-            return new Span<Entity>(_storageIndexToEntities, 0, _nextID);
+            return new ReadOnlySpan<Entity>(_storageIndexToEntities, 0, _nextID);
        }

-        public Span<TComponent> AllComponents()
+        public IEnumerable<Entity> AllEntitiesAsEnumerable()
        {
-            return new Span<TComponent>(_components, 0, _nextID);
+            return new ArraySegment<Entity>(_storageIndexToEntities, 0, _nextID);
+        }
+
+        public ReadOnlySpan<TComponent> AllComponents()
+        {
+            return new ReadOnlySpan<TComponent>(_components, 0, _nextID);
+        }
+
+        public IEnumerable<TComponent> AllComponentsAsEnumerable()
+        {
+            return new ArraySegment<TComponent>(_components, 0, _nextID);
        }
    }
 }
--- a/encompass-cs/Collections/TypedMessageStore.cs
+++ b/encompass-cs/Collections/TypedMessageStore.cs
@ -9,7 +9,7 @@ namespace Encompass
        public abstract void Clear();
    }

-    internal class TypedMessageStore<TMessage> : TypedMessageStore where TMessage : struct, IMessage
+    internal class TypedMessageStore<TMessage> : TypedMessageStore where TMessage : struct
    {
        // messages are placed in a contiguous region
        // so we can return the collection as a Span
@ -92,9 +92,9 @@ namespace Encompass
            return _nextIndex != 0;
        }

-        public Span<TMessage> All()
+        public ReadOnlySpan<TMessage> All()
        {
-            return new Span<TMessage>(_store, 0, _nextIndex);
+            return new ReadOnlySpan<TMessage>(_store, 0, _nextIndex);
        }

        public IEnumerable<TMessage> WithEntity(int entityID)
--- a/encompass-cs/ComponentManager.cs
+++ b/encompass-cs/ComponentManager.cs
@ -5,8 +5,6 @@ namespace Encompass
 {
    internal class ComponentManager
    {
-        private readonly DrawLayerManager _drawLayerManager;
-
        private readonly ComponentStore _existingComponentStore;
        private readonly ComponentStore _immediateComponentStore;
        private readonly ComponentDeltaStore _replayStore;
@ -19,9 +17,8 @@ namespace Encompass
        internal ComponentBitSet ImmediateBits { get { return _immediateComponentStore.ComponentBitSet; } }
        internal ComponentBitSet ExistingBits { get { return _existingComponentStore.ComponentBitSet; } }

-        public ComponentManager(DrawLayerManager drawLayerManager, Dictionary<Type, int> typeToIndex)
+        public ComponentManager(Dictionary<Type, int> typeToIndex)
        {
-            this._drawLayerManager = drawLayerManager;
            _existingComponentStore = new ComponentStore(typeToIndex);
            _immediateComponentStore = new ComponentStore(typeToIndex);
            _replayStore = new ComponentDeltaStore(typeToIndex);
@ -47,11 +44,6 @@ namespace Encompass
            _upToDateComponentStore.SwapWith(componentStore);
        }

-        internal void RegisterDrawableComponent<TComponent>(int entityID, int layer) where TComponent : struct
-        {
-            _drawLayerManager.RegisterComponentWithLayer<TComponent>(entityID, layer);
-        }
-
        internal void WriteComponents()
        {
            _existingComponentStore.UpdateUsing(_replayStore);
@ -98,7 +90,7 @@ namespace Encompass

        // existing or immediate reads

-        internal Span<TComponent> ReadExistingAndImmediateComponentsByType<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<TComponent> ReadExistingAndImmediateComponentsByType<TComponent>() where TComponent : struct
        {
            return _upToDateComponentStore.All<TComponent>();
        }
@ -108,7 +100,7 @@ namespace Encompass
            return ref _upToDateComponentStore.Singular<TComponent>();
        }

-        internal Span<Entity> GetExistingAndImmediateEntities<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<Entity> GetExistingAndImmediateEntities<TComponent>() where TComponent : struct
        {
            return _upToDateComponentStore.AllEntities<TComponent>();
        }
@ -125,7 +117,7 @@ namespace Encompass

        // existing reads

-        internal Span<TComponent> GetExistingComponents<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<TComponent> GetExistingComponents<TComponent>() where TComponent : struct
        {
            return _existingComponentStore.All<TComponent>();
        }
@ -135,11 +127,16 @@ namespace Encompass
            return ref _existingComponentStore.Singular<TComponent>();
        }

-        internal Span<Entity> GetExistingEntities<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<Entity> GetExistingEntities<TComponent>() where TComponent : struct
        {
            return _existingComponentStore.AllEntities<TComponent>();
        }

+        internal IEnumerable<Entity> GetExistingEntitiesAsEnumerable<TComponent>() where TComponent : struct
+        {
+            return _existingComponentStore.AllEntitiesAsEnumerable<TComponent>();
+        }
+
        internal ref readonly Entity ExistingSingularEntity<TComponent>() where TComponent : struct
        {
            return ref _existingComponentStore.SingularEntity<TComponent>();
@ -152,7 +149,7 @@ namespace Encompass

        // immediate reads

-        internal Span<TComponent> ReadImmediateComponentsByType<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<TComponent> ReadImmediateComponentsByType<TComponent>() where TComponent : struct
        {
            return _immediateComponentStore.All<TComponent>();
        }
@ -162,7 +159,7 @@ namespace Encompass
            return ref _immediateComponentStore.Singular<TComponent>();
        }

-        internal Span<Entity> GetImmediateEntities<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<Entity> GetImmediateEntities<TComponent>() where TComponent : struct
        {
            return _immediateComponentStore.AllEntities<TComponent>();
        }
@ -226,11 +223,16 @@ namespace Encompass
            return _immediateComponentStore.Has(type, entityID);
        }

-        internal Span<TComponent> GetComponentsByType<TComponent>() where TComponent : struct
+        internal ReadOnlySpan<TComponent> GetComponentsByType<TComponent>() where TComponent : struct
        {
            return _existingComponentStore.All<TComponent>();
        }

+        internal IEnumerable<TComponent> GetComponentsByTypeEnumerable<TComponent>() where TComponent : struct
+        {
+            return _existingComponentStore.AllAsEnumerable<TComponent>();
+        }
+
        internal ref readonly TComponent GetComponentByEntityAndType<TComponent>(int entityID) where TComponent : struct
        {
            return ref _existingComponentStore.Get<TComponent>(entityID);
@ -254,7 +256,6 @@ namespace Encompass
                _immediateComponentStore.Remove(entityID);
                _replayStore.Remove(entityID);
                _upToDateComponentStore.Remove(entityID);
-                _drawLayerManager.UnRegisterEntityWithLayer(entityID);
            }

            _entitiesMarkedForRemoval.Clear();
@ -266,7 +267,6 @@ namespace Encompass
            {
                _replayStore.Remove<TComponent>(entityID, priority);
                _upToDateComponentStore.Remove<TComponent>(entityID, priority);
-                _drawLayerManager.UnRegisterComponentWithLayer<TComponent>(entityID);
                return true;
            }
            return false;
@ -277,7 +277,6 @@ namespace Encompass
            if (_upToDateComponentStore.Remove<TComponent>(entityID, priority))
            {
                _replayStore.Remove<TComponent>(entityID, priority);
-                _drawLayerManager.UnRegisterComponentWithLayer<TComponent>(entityID);
            }
        }

--- a/encompass-cs/DrawLayerManager.cs
+++ b/encompass-cs/DrawLayerManager.cs
@ -1,132 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Encompass.Exceptions;
-
-namespace Encompass
-{
-    internal class DrawLayerManager
-    {
-        private readonly SortedList<int, int> _layerOrder = new SortedList<int, int>();
-
-        private readonly Dictionary<int, Dictionary<Type, HashSet<int>>> _layerIndexToTypeToID = new Dictionary<int, Dictionary<Type, HashSet<int>>>();
-        private readonly Dictionary<int, HashSet<GeneralRenderer>> _layerIndexToGeneralRenderers = new Dictionary<int, HashSet<GeneralRenderer>>(512);
-
-        private readonly Dictionary<Type, Dictionary<int, int>> _typeToEntityToLayer = new Dictionary<Type, Dictionary<int, int>>(512);
-        public IEnumerable<int> LayerOrder { get { return _layerOrder.Values; } }
-
-        public DrawLayerManager()
-        {
-            RegisterDrawLayer(0);
-        }
-
-        public void RegisterDrawLayer(int layer)
-        {
-            if (!_layerIndexToTypeToID.ContainsKey(layer))
-            {
-                _layerOrder.Add(layer, layer);
-                _layerIndexToGeneralRenderers.Add(layer, new HashSet<GeneralRenderer>());
-                _layerIndexToTypeToID.Add(layer, new Dictionary<Type, HashSet<int>>());
-            }
-        }
-
-        public void RegisterOrderedDrawable<TComponent>() where TComponent : struct
-        {
-            if (!_typeToEntityToLayer.ContainsKey(typeof(TComponent)))
-            {
-                _typeToEntityToLayer.Add(typeof(TComponent), new Dictionary<int, int>(128));
-            }
-
-            foreach (var pair in _layerIndexToTypeToID)
-            {
-                if (!pair.Value.ContainsKey(typeof(TComponent)))
-                {
-                    pair.Value.Add(typeof(TComponent), new HashSet<int>());
-                }
-            }
-        }
-
-        public void RegisterGeneralRendererWithLayer(GeneralRenderer renderer, int layer)
-        {
-            RegisterDrawLayer(layer);
-            var set = _layerIndexToGeneralRenderers[layer];
-            set.Add(renderer);
-        }
-
-        public void RegisterComponentWithLayer<TComponent>(int entityID, int layer) where TComponent : struct
-        {
-            if (!_layerIndexToTypeToID.ContainsKey(layer))
-            {
-                throw new UndefinedLayerException("Layer {0} is not defined. Use WorldBuilder.RegisterDrawLayer to register the layer.", layer);
-            }
-
-            if (_typeToEntityToLayer[typeof(TComponent)].ContainsKey(entityID))
-            {
-                if (_typeToEntityToLayer[typeof(TComponent)][entityID] != layer)
-                {
-                    UnRegisterComponentWithLayer<TComponent>(entityID);
-
-                    var set = _layerIndexToTypeToID[layer][typeof(TComponent)];
-                    set.Add(entityID);
-
-                    _typeToEntityToLayer[typeof(TComponent)].Add(entityID, layer);
-                }
-            }
-            else
-            {
-                var set = _layerIndexToTypeToID[layer][typeof(TComponent)];
-                set.Add(entityID);
-
-                _typeToEntityToLayer[typeof(TComponent)].Add(entityID, layer);
-            }
-        }
-
-        public void UnRegisterComponentWithLayer<TComponent>(int entityID) where TComponent : struct
-        {
-            if (!_typeToEntityToLayer.ContainsKey(typeof(TComponent))) { return; }
-
-            if (_typeToEntityToLayer[typeof(TComponent)].ContainsKey(entityID))
-            {
-                var layer = _typeToEntityToLayer[typeof(TComponent)][entityID];
-                _layerIndexToTypeToID[layer][typeof(TComponent)].Remove(entityID);
-            }
-            _typeToEntityToLayer[typeof(TComponent)].Remove(entityID);
-        }
-
-        public void UnRegisterEntityWithLayer(int entityID)
-        {
-            foreach (var store in _layerIndexToTypeToID.Values)
-            {
-                foreach (var typeToSet in store)
-                {
-                    var type = typeToSet.Key;
-                    var set = typeToSet.Value;
-
-                    if (set.Contains(entityID))
-                    {
-                        _typeToEntityToLayer[type].Remove(entityID);
-                        set.Remove(entityID);
-                    }
-                }
-            }
-        }
-
-        public IEnumerable<GeneralRenderer> GeneralRenderersByLayer(int layer)
-        {
-            return _layerIndexToGeneralRenderers.ContainsKey(layer) ?
-                _layerIndexToGeneralRenderers[layer] :
-                Enumerable.Empty<GeneralRenderer>();
-        }
-
-        public IEnumerable<(int, Type)> AllInLayer(int layer)
-        {
-            foreach (var kvp in _layerIndexToTypeToID[layer])
-            {
-                foreach (var id in kvp.Value)
-                {
-                    yield return (id, kvp.Key);
-                }
-            }
-        }
-    }
-}
--- a/encompass-cs/Engine.cs
+++ b/encompass-cs/Engine.cs
@ -3,7 +3,6 @@ using System.Reflection;
 using System.Collections.Generic;
 using System.Linq;
 using Encompass.Exceptions;
-using MoonTools.FastCollections;

 namespace Encompass
 {
@ -24,6 +23,7 @@ namespace Encompass
        internal readonly HashSet<Type> WriteImmediateTypes = new HashSet<Type>();
        internal readonly HashSet<Type> QueryWithTypes = new HashSet<Type>();
        internal readonly HashSet<Type> QueryWithoutTypes = new HashSet<Type>();
+        internal readonly HashSet<Type> AddTypes = new HashSet<Type>();
        internal readonly Dictionary<Type, int> WritePriorities = new Dictionary<Type, int>();
        internal readonly int DefaultWritePriority = 0;

@ -59,6 +59,12 @@ namespace Encompass
        {
            _id = Guid.NewGuid();

+            var addsAttribute = GetType().GetCustomAttribute<Adds>(false);
+            if (addsAttribute != null)
+            {
+                AddTypes = addsAttribute.addTypes;
+            }
+
            var sendsAttribute = GetType().GetCustomAttribute<Sends>(false);
            if (sendsAttribute != null)
            {
@ -108,11 +114,21 @@ namespace Encompass
                QueryWithTypes = queryWithAttribute.QueryWithTypes;
            }

+            foreach (var queryType in QueryWithTypes)
+            {
+                ReadTypes.Add(queryType);
+            }
+
            var queryWithoutAttribute = GetType().GetCustomAttribute<QueryWithout>(false);
            if (queryWithoutAttribute != null)
            {
                QueryWithoutTypes = queryWithoutAttribute.QueryWithoutTypes;
            }
+
+            foreach (var queryType in QueryWithoutTypes)
+            {
+                ReadTypes.Add(queryType);
+            }
        }

        public override bool Equals(object obj)
@ -160,7 +176,7 @@ namespace Encompass
            _trackingManager = trackingManager;
        }

-        internal void CheckMessageRead<TMessage>() where TMessage : struct, IMessage
+        internal void CheckMessageRead<TMessage>() where TMessage : struct
        {
            if (!ReceiveTypes.Contains(typeof(TMessage)))
            {
@ -213,7 +229,7 @@ namespace Encompass
        /// <summary>
        /// Returns all Entities containing the specified Component type.
        /// </summary>
-        protected Span<Entity> ReadEntities<TComponent>() where TComponent : struct, IComponent
+        protected ReadOnlySpan<Entity> ReadEntities<TComponent>() where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -238,7 +254,7 @@ namespace Encompass
        /// <summary>
        /// Returns an Entity containing the specified Component type.
        /// </summary>
-        protected ref readonly Entity ReadEntity<TComponent>() where TComponent : struct, IComponent
+        protected ref readonly Entity ReadEntity<TComponent>() where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -263,7 +279,7 @@ namespace Encompass
        /// <summary>
        /// Returns all of the Components with the specified Component Type.
        /// </summary>
-        protected Span<TComponent> ReadComponents<TComponent>() where TComponent : struct, IComponent
+        protected ReadOnlySpan<TComponent> ReadComponents<TComponent>() where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -288,7 +304,7 @@ namespace Encompass
        /// <summary>
        /// Returns a Component with the specified Component Type. If multiples exist, an arbitrary Component is returned.
        /// </summary>
-        protected ref readonly TComponent ReadComponent<TComponent>() where TComponent : struct, IComponent
+        protected ref readonly TComponent ReadComponent<TComponent>() where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -313,7 +329,7 @@ namespace Encompass
        /// <summary>
        /// Returns true if any Component with the specified Component Type exists.
        /// </summary>
-        protected bool SomeComponent<TComponent>() where TComponent : struct, IComponent
+        protected bool SomeComponent<TComponent>() where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -335,7 +351,7 @@ namespace Encompass
            }
        }

-        private ref TComponent GetComponentHelper<TComponent>(int entityID) where TComponent : struct, IComponent
+        private ref TComponent GetComponentHelper<TComponent>(int entityID) where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -366,7 +382,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalReadException">
        /// Thrown when the Engine does not declare that it reads the given Component Type.
        /// </exception>
-        protected ref readonly TComponent GetComponent<TComponent>(in Entity entity) where TComponent : struct, IComponent
+        protected ref readonly TComponent GetComponent<TComponent>(in Entity entity) where TComponent : struct
        {
            return ref GetComponentHelper<TComponent>(entity.ID);
        }
@ -377,7 +393,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalReadException">
        /// Thrown when the Engine does not declare that is Reads the given Component Type.
        /// </exception>
-        protected bool HasComponent<TComponent>(in Entity entity) where TComponent : struct, IComponent
+        protected bool HasComponent<TComponent>(in Entity entity) where TComponent : struct
        {
            var immediateRead = ReadImmediateTypes.Contains(typeof(TComponent));
            var existingRead = ReadTypes.Contains(typeof(TComponent));
@ -435,7 +451,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalWriteException">
        /// Thrown when the Engine does not declare that it Writes the given Component Type.
        /// </exception>
-        protected void SetComponent<TComponent>(in Entity entity, in TComponent component) where TComponent : struct, IComponent
+        protected void SetComponent<TComponent>(in Entity entity, in TComponent component) where TComponent : struct
        {
            var priority = WritePriorities.ContainsKey(typeof(TComponent)) ? WritePriorities[typeof(TComponent)] : DefaultWritePriority;

@ -462,11 +478,6 @@ namespace Encompass
            {
                _trackingManager.RegisterAddition(entity.ID, typeof(TComponent));
            }
-
-            if (written && component is IDrawableComponent drawableComponent)
-            {
-                _componentManager.RegisterDrawableComponent<TComponent>(entity.ID, drawableComponent.Layer);
-            }
        }

        /// <summary>
@ -475,8 +486,13 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalWriteException">
        /// Thrown when the Engine does not declare that it Writes the given Component Type.
        /// </exception>
-        protected void AddComponent<TComponent>(in Entity entity, in TComponent component) where TComponent : struct, IComponent
+        protected void AddComponent<TComponent>(in Entity entity, in TComponent component) where TComponent : struct
        {
+            if (!AddTypes.Contains(typeof(TComponent)))
+            {
+                throw new IllegalWriteException("Engine {0} tried to add undeclared Component {1}", GetType().Name, typeof(TComponent).Name);
+            }
+
            if (!EntityCreatedThisFrame(entity.ID))
            {
                throw new IllegalWriteException("AddComponent used on Entity that was not created in this context. Use SetComponent instead.");
@ -493,11 +509,6 @@ namespace Encompass
            }

            _trackingManager.RegisterAddition(entity.ID, typeof(TComponent));
-
-            if (component is IDrawableComponent drawableComponent)
-            {
-                _componentManager.RegisterDrawableComponent<TComponent>(entity.ID, drawableComponent.Layer);
-            }
        }

        /// <summary>
@ -506,7 +517,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalSendException">
        /// Thrown when the Engine does not declare that it Sends the Message Type.
        /// </exception>
-        protected void SendMessage<TMessage>(in TMessage message) where TMessage : struct, IMessage
+        protected void SendMessage<TMessage>(in TMessage message) where TMessage : struct
        {
            if (!SendTypes.Contains(typeof(TMessage)))
            {
@ -520,7 +531,7 @@ namespace Encompass
        /// Sends a message after the specified number of seconds, respecting time dilation.
        /// </summary>
        /// <param name="time">The time in seconds that will elapse before the message is sent.</param>
-        protected void SendMessage<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        protected void SendMessage<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            _messageManager.AddMessage(message, time);
        }
@ -529,7 +540,7 @@ namespace Encompass
        /// Sends a message after the specified number of seconds, ignoring time dilation.
        /// </summary>
        /// <param name="time">The time in seconds that will elapse before the message is sent.</param>
-        protected void SendMessageIgnoringTimeDilation<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        protected void SendMessageIgnoringTimeDilation<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            _messageManager.AddMessageIgnoringTimeDilation(message, time);
        }
@ -540,7 +551,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalReadException">
        /// Thrown when the Engine does not declare that it Receives the specified Message Type.
        /// </exception>
-        protected Span<TMessage> ReadMessages<TMessage>() where TMessage : struct, IMessage
+        protected ReadOnlySpan<TMessage> ReadMessages<TMessage>() where TMessage : struct
        {
            CheckMessageRead<TMessage>();
            return _messageManager.GetMessagesByType<TMessage>();
@ -552,7 +563,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalReadException">
        /// Thrown when the Engine does not declare that it Receives the specified Message Type.
        /// </exception>
-        protected ref readonly TMessage ReadMessage<TMessage>() where TMessage : struct, IMessage
+        protected ref readonly TMessage ReadMessage<TMessage>() where TMessage : struct
        {
            CheckMessageRead<TMessage>();
            return ref _messageManager.First<TMessage>();
@ -564,7 +575,7 @@ namespace Encompass
        /// <exception cref="Encompass.Exceptions.IllegalReadException">
        /// Thrown when the Engine does not declare that it Receives the specified Message Type.
        /// </exception>
-        protected bool SomeMessage<TMessage>() where TMessage : struct, IMessage
+        protected bool SomeMessage<TMessage>() where TMessage : struct
        {
            CheckMessageRead<TMessage>();
            return _messageManager.Any<TMessage>();
@ -583,7 +594,7 @@ namespace Encompass
        /// Destroys an arbitrary Entity containing a Component of the specified Type.
        /// Entity destruction takes place after all the Engines have been processed by World Update.
        /// </summary>
-        protected void DestroyWith<TComponent>() where TComponent : struct, IComponent
+        protected void DestroyWith<TComponent>() where TComponent : struct
        {
            Destroy(ReadEntity<TComponent>());
        }
@ -592,7 +603,7 @@ namespace Encompass
        /// Destroys all Entities containing a Component of the specified Type.
        /// Entity destruction takes place after all the Engines have been processed by World Update.
        /// </summary>
-        protected void DestroyAllWith<TComponent>() where TComponent : struct, IComponent
+        protected void DestroyAllWith<TComponent>() where TComponent : struct
        {
            foreach (var entity in ReadEntities<TComponent>())
            {
@ -605,7 +616,7 @@ namespace Encompass
        /// Note that the Engine must Read the Component type that is being removed.
        /// If a Component with the specified type does not exist on the Entity, returns false and does not mutate the Entity.
        /// </summary>
-        protected void RemoveComponent<TComponent>(in Entity entity) where TComponent : struct, IComponent
+        protected void RemoveComponent<TComponent>(in Entity entity) where TComponent : struct
        {
            var priority = WritePriorities.ContainsKey(typeof(TComponent)) ? WritePriorities[typeof(TComponent)] : DefaultWritePriority;

@ -698,7 +709,7 @@ namespace Encompass
        /// <typeparam name="TMessage">The Message subtype.</typeparam>
        /// <param name="entity">The entity that all messages in the IEnumerable refer to.</param>
        /// <returns></returns>
-        protected IEnumerable<TMessage> ReadMessagesWithEntity<TMessage>(in Entity entity) where TMessage : struct, IMessage, IHasEntity
+        protected IEnumerable<TMessage> ReadMessagesWithEntity<TMessage>(in Entity entity) where TMessage : struct, IHasEntity
        {
            CheckMessageRead<TMessage>();
            return _messageManager.WithEntity<TMessage>(entity.ID);
@ -708,7 +719,7 @@ namespace Encompass
        /// Efficiently reads a single Message of a given type that references a given Entity.
        /// It is recommended to use this method in conjunction with SomeMessageWithEntity to prevent errors.
        /// </summary>
-        protected ref readonly TMessage ReadMessageWithEntity<TMessage>(in Entity entity) where TMessage : struct, IMessage, IHasEntity
+        protected ref readonly TMessage ReadMessageWithEntity<TMessage>(in Entity entity) where TMessage : struct, IHasEntity
        {
            CheckMessageRead<TMessage>();
            return ref _messageManager.WithEntitySingular<TMessage>(entity.ID);
@ -717,7 +728,7 @@ namespace Encompass
        /// <summary>
        /// Efficiently checks if any Message of a given type referencing a given Entity exists.
        /// </summary>
-        protected bool SomeMessageWithEntity<TMessage>(in Entity entity) where TMessage : struct, IMessage, IHasEntity
+        protected bool SomeMessageWithEntity<TMessage>(in Entity entity) where TMessage : struct, IHasEntity
        {
            CheckMessageRead<TMessage>();
            return _messageManager.SomeWithEntity<TMessage>(entity.ID);
--- a/encompass-cs/Engines/Spawner.cs
+++ b/encompass-cs/Engines/Spawner.cs
@ -6,7 +6,7 @@ namespace Encompass
    /// A Spawner is a special type of Engine that runs a Spawn method in response to each Message it receives.
    /// Spawners are useful for organizing the building of new Entities in your game.
    /// </summary>
-    public abstract class Spawner<TMessage> : Engine where TMessage : struct, IMessage
+    public abstract class Spawner<TMessage> : Engine where TMessage : struct
    {
        protected Spawner() : base()
        {
@ -21,12 +21,12 @@ namespace Encompass

        public override void Update(double dt)
        {
-            foreach (var message in ReadMessages<TMessage>())
+            foreach (ref readonly var message in ReadMessages<TMessage>())
            {
                Spawn(message);
            }
        }

-        protected abstract void Spawn(TMessage message);
+        protected abstract void Spawn(in TMessage message);
    }
 }
--- a/encompass-cs/EntitySetQuery.cs
+++ b/encompass-cs/EntitySetQuery.cs
@ -1,6 +1,4 @@
-using MoonTools.FastCollections;
-
-namespace Encompass
+namespace Encompass
 {
    internal struct EntitySetQuery
    {
--- a/encompass-cs/Exceptions/NoComponentOfTypeException.cs
+++ b/encompass-cs/Exceptions/NoComponentOfTypeException.cs
@ -1,25 +1,12 @@
 using System;
-using System.Runtime.Serialization;

 namespace Encompass.Exceptions
 {
-    [Serializable]
-    internal class NoComponentOfTypeException : Exception
+    public class NoComponentOfTypeException : Exception
    {
-        public NoComponentOfTypeException()
-        {
-        }
-
-        public NoComponentOfTypeException(string message) : base(message)
-        {
-        }
-
-        public NoComponentOfTypeException(string message, Exception innerException) : base(message, innerException)
-        {
-        }
-
-        protected NoComponentOfTypeException(SerializationInfo info, StreamingContext context) : base(info, context)
-        {
-        }
+        public NoComponentOfTypeException(
+            string format,
+            params object[] args
+        ) : base(string.Format(format, args)) { }
    }
 }
--- a/encompass-cs/Exceptions/NoMessageOfTypeException.cs
+++ b/encompass-cs/Exceptions/NoMessageOfTypeException.cs
@ -2,9 +2,9 @@ using System;

 namespace Encompass.Exceptions
 {
-    public class IllegalSendTypeException : Exception
+    public class NoMessageOfTypeException : Exception
    {
-        public IllegalSendTypeException(
+        public NoMessageOfTypeException(
            string format,
            params object[] args
        ) : base(string.Format(format, args)) { }
--- a/encompass-cs/Graph/DirectedGraph.cs
+++ b/encompass-cs/Graph/DirectedGraph.cs
@ -0,0 +1,390 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Encompass
+{
+    internal class DirectedGraph<TNode> where TNode : IEquatable<TNode>
+    {
+        protected HashSet<TNode> nodes = new HashSet<TNode>();
+        protected Dictionary<TNode, HashSet<TNode>> neighbors = new Dictionary<TNode, HashSet<TNode>>();
+
+        protected HashSet<(TNode, TNode)> edges = new HashSet<(TNode, TNode)>();
+
+        public IEnumerable<TNode> Nodes => nodes;
+        public IEnumerable<(TNode, TNode)> Edges => edges;
+
+        public void AddNode(TNode node)
+        {
+            if (!Exists(node))
+            {
+                nodes.Add(node);
+                neighbors.Add(node, new HashSet<TNode>());
+            }
+        }
+
+        public void AddNodes(params TNode[] nodes)
+        {
+            foreach (var node in nodes)
+            {
+                AddNode(node);
+            }
+        }
+
+        public void RemoveNode(TNode node)
+        {
+            CheckNodes(node);
+
+            var edgesToRemove = new List<(TNode, TNode)>();
+
+            foreach (var entry in neighbors)
+            {
+                if (entry.Value.Contains(node))
+                {
+                    edgesToRemove.Add((entry.Key, node));
+                }
+            }
+
+            foreach (var edge in edgesToRemove)
+            {
+                RemoveEdge(edge.Item1, edge.Item2);
+            }
+
+            nodes.Remove(node);
+            neighbors.Remove(node);
+        }
+
+        public void RemoveEdge(TNode v, TNode u)
+        {
+            CheckEdge(v, u);
+            neighbors[v].Remove(u);
+            edges.Remove((v, u));
+        }
+
+        public void AddEdge(TNode v, TNode u)
+        {
+            CheckNodes(v, u);
+            if (Exists(v, u)) { throw new ArgumentException($"Edge between {v} and {u} already exists in the graph"); }
+
+            if (v.Equals(u)) { throw new ArgumentException("Self-edges are not allowed in a simple graph. Use a multigraph instead"); }
+
+            neighbors[v].Add(u);
+            edges.Add((v, u));
+        }
+
+        public bool Exists(TNode node)
+        {
+            return nodes.Contains(node);
+        }
+
+        public bool Exists(TNode v, TNode u)
+        {
+            CheckNodes(v, u);
+            return edges.Contains((v, u));
+        }
+
+        protected void CheckNodes(params TNode[] givenNodes)
+        {
+            foreach (var node in givenNodes)
+            {
+                if (!Exists(node))
+                {
+                    throw new System.ArgumentException($"Vertex {node} does not exist in the graph");
+                }
+            }
+        }
+
+        protected void CheckEdge(TNode v, TNode u)
+        {
+            CheckNodes(v, u);
+            if (!Exists(v, u)) { throw new ArgumentException($"Edge between vertex {v} and vertex {u} does not exist in the graph"); }
+        }
+
+        public IEnumerable<TNode> Neighbors(TNode node)
+        {
+            CheckNodes(node);
+            return neighbors[node];
+        }
+
+        public DirectedGraph<TNode> Clone()
+        {
+            var clone = new DirectedGraph<TNode>();
+            clone.AddNodes(Nodes.ToArray());
+
+            foreach (var v in Nodes)
+            {
+                foreach (var n in Neighbors(v))
+                {
+                    clone.AddEdge(v, n);
+                }
+            }
+
+            return clone;
+        }
+
+        public DirectedGraph<TNode> SubGraph(params TNode[] subVertices)
+        {
+            var subGraph = new DirectedGraph<TNode>();
+            subGraph.AddNodes(subVertices.ToArray());
+
+            foreach (var n in Nodes)
+            {
+                if (Nodes.Contains(n))
+                {
+                    var neighbors = Neighbors(n);
+                    foreach (var u in neighbors)
+                    {
+                        if (subVertices.Contains(u))
+                        {
+                            subGraph.AddEdge(n, u);
+                        }
+                    }
+                }
+            }
+
+            return subGraph;
+        }
+
+        private IEnumerable<TNode> PostorderNodeDFSHelper(HashSet<TNode> discovered, TNode v)
+        {
+            discovered.Add(v);
+
+            foreach (var neighbor in Neighbors(v))
+            {
+                if (!discovered.Contains(neighbor))
+                {
+                    foreach (var node in PostorderNodeDFSHelper(discovered, neighbor))
+                    {
+                        yield return node;
+                    }
+                }
+            }
+
+            yield return v;
+        }
+
+        protected IEnumerable<TNode> PostorderNodeDFS()
+        {
+            var dfsDiscovered = new HashSet<TNode>();
+
+            foreach (var node in Nodes)
+            {
+                if (!dfsDiscovered.Contains(node))
+                {
+                    foreach (var thing in PostorderNodeDFSHelper(dfsDiscovered, node))
+                    {
+                        yield return thing;
+                    }
+                }
+            }
+        }
+
+        public IEnumerable<TNode> TopologicalSort()
+        {
+            return PostorderNodeDFS().Reverse();
+        }
+
+        public bool Cyclic()
+        {
+            return StronglyConnectedComponents().Any((scc) => scc.Count() > 1);
+        }
+
+        public IEnumerable<IEnumerable<TNode>> SimpleCycles()
+        {
+            void unblock(TNode thisnode, HashSet<TNode> blocked, Dictionary<TNode, HashSet<TNode>> B) //refactor to remove closure
+            {
+                var stack = new Stack<TNode>();
+                stack.Push(thisnode);
+
+                while (stack.Count > 0)
+                {
+                    var node = stack.Pop();
+                    if (blocked.Contains(thisnode))
+                    {
+                        blocked.Remove(thisnode);
+                        if (B.ContainsKey(node))
+                        {
+                            foreach (var n in B[node])
+                            {
+                                if (!stack.Contains(n))
+                                {
+                                    stack.Push(n);
+                                }
+                            }
+                            B[node].Clear();
+                        }
+                    }
+                }
+            }
+
+            List<List<TNode>> result = new List<List<TNode>>();
+            var subGraph = Clone();
+
+            var sccs = new Stack<IEnumerable<TNode>>();
+            foreach (var scc in StronglyConnectedComponents())
+            {
+                sccs.Push(scc);
+            }
+
+            while (sccs.Count > 0)
+            {
+                var scc = new Stack<TNode>(sccs.Pop());
+                var startNode = scc.Pop();
+                var path = new Stack<TNode>();
+                path.Push(startNode);
+                var blocked = new HashSet<TNode>
+                {
+                    startNode
+                };
+                var closed = new HashSet<TNode>();
+                var B = new Dictionary<TNode, HashSet<TNode>>();
+                var stack = new Stack<(TNode, Stack<TNode>)>();
+                stack.Push((startNode, new Stack<TNode>(subGraph.Neighbors(startNode))));
+
+                while (stack.Count > 0)
+                {
+                    var entry = stack.Peek();
+                    var thisnode = entry.Item1;
+                    var neighbors = entry.Item2;
+
+                    if (neighbors.Count > 0)
+                    {
+                        var nextNode = neighbors.Pop();
+
+                        if (nextNode.Equals(startNode))
+                        {
+                            var resultPath = new List<TNode>();
+                            foreach (var v in path)
+                            {
+                                resultPath.Add(v);
+                            }
+                            result.Add(resultPath);
+                            foreach (var v in path)
+                            {
+                                closed.Add(v);
+                            }
+                        }
+                        else if (!blocked.Contains(nextNode))
+                        {
+                            path.Push(nextNode);
+                            stack.Push((nextNode, new Stack<TNode>(subGraph.Neighbors(nextNode))));
+                            closed.Remove(nextNode);
+                            blocked.Add(nextNode);
+                            continue;
+                        }
+                    }
+
+                    if (neighbors.Count == 0)
+                    {
+                        if (closed.Contains(thisnode))
+                        {
+                            unblock(thisnode, blocked, B);
+                        }
+                        else
+                        {
+                            foreach (var neighbor in subGraph.Neighbors(thisnode))
+                            {
+                                if (!B.ContainsKey(neighbor))
+                                {
+                                    B[neighbor] = new HashSet<TNode>();
+                                }
+                                B[neighbor].Add(thisnode);
+                            }
+                        }
+
+                        stack.Pop();
+                        path.Pop();
+                    }
+                }
+
+                subGraph.RemoveNode(startNode);
+                var H = subGraph.SubGraph(scc.ToArray());
+                var HSccs = H.StronglyConnectedComponents();
+                foreach (var HScc in HSccs)
+                {
+                    sccs.Push(HScc);
+                }
+            }
+
+            return result.Distinct(new SimpleCycleComparer<TNode>());
+        }
+
+        protected IEnumerable<IEnumerable<TNode>> StronglyConnectedComponents()
+        {
+            var preorder = new Dictionary<TNode, uint>();
+            var lowlink = new Dictionary<TNode, uint>();
+            var sccFound = new Dictionary<TNode, bool>();
+            var sccQueue = new Stack<TNode>();
+
+            uint preorderCounter = 0;
+
+            foreach (var source in Nodes)
+            {
+                if (!sccFound.ContainsKey(source))
+                {
+                    var queue = new Stack<TNode>();
+                    queue.Push(source);
+
+                    while (queue.Count > 0)
+                    {
+                        var v = queue.Peek();
+                        if (!preorder.ContainsKey(v))
+                        {
+                            preorderCounter++;
+                            preorder[v] = preorderCounter;
+                        }
+
+                        var done = true;
+                        var vNeighbors = Neighbors(v);
+                        foreach (var w in vNeighbors)
+                        {
+                            if (!preorder.ContainsKey(w))
+                            {
+                                queue.Push(w);
+                                done = false;
+                                break;
+                            }
+                        }
+
+                        if (done)
+                        {
+                            lowlink[v] = preorder[v];
+                            foreach (var w in vNeighbors)
+                            {
+                                if (!sccFound.ContainsKey(w))
+                                {
+                                    if (preorder[w] > preorder[v])
+                                    {
+                                        lowlink[v] = Math.Min(lowlink[v], lowlink[w]);
+                                    }
+                                    else
+                                    {
+                                        lowlink[v] = Math.Min(lowlink[v], preorder[w]);
+                                    }
+                                }
+                            }
+                            queue.Pop();
+                            if (lowlink[v] == preorder[v])
+                            {
+                                sccFound[v] = true;
+                                var scc = new List<TNode>() { v };
+                                while (sccQueue.Count > 0 && preorder[sccQueue.Peek()] > preorder[v])
+                                {
+                                    var k = sccQueue.Pop();
+                                    sccFound[k] = true;
+                                    scc.Add(k);
+                                }
+
+                                yield return scc;
+                            }
+                            else
+                            {
+                                sccQueue.Push(v);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
--- a/encompass-cs/Graph/SimpleCycleComparer.cs
+++ b/encompass-cs/Graph/SimpleCycleComparer.cs
@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Encompass
+{
+    internal class SimpleCycleComparer<TNode> : IEqualityComparer<IEnumerable<TNode>>
+    {
+        public bool Equals(IEnumerable<TNode> x, IEnumerable<TNode> y)
+        {
+            return x.SequenceEqual(y);
+        }
+
+        public int GetHashCode(IEnumerable<TNode> obj)
+        {
+            return obj.Aggregate(0, (current, next) => current.GetHashCode() ^ next.GetHashCode());
+        }
+    }
+}
--- a/encompass-cs/IMessage.cs
+++ b/encompass-cs/IMessage.cs
@ -1,7 +0,0 @@
-namespace Encompass
-{
-    /// <summary>
-    /// Structs that implement IMessage are considered to be Messages.
-    /// </summary>
-    public interface IMessage { }
-}
--- a/encompass-cs/Interfaces/IComponent.cs
+++ b/encompass-cs/Interfaces/IComponent.cs
@ -1,4 +0,0 @@
-namespace Encompass
-{
-    public interface IComponent { }
-}
--- a/encompass-cs/Interfaces/IDrawableComponent.cs
+++ b/encompass-cs/Interfaces/IDrawableComponent.cs
@ -1,7 +0,0 @@
-namespace Encompass
-{
-    public interface IDrawableComponent
-    {
-        int Layer { get; }
-    }
-}
--- a/encompass-cs/MessageManager.cs
+++ b/encompass-cs/MessageManager.cs
@ -13,17 +13,17 @@ namespace Encompass
            _timeManager = timeManager;
        }

-        internal void AddMessage<TMessage>(in TMessage message) where TMessage : struct, IMessage
+        internal void AddMessage<TMessage>(in TMessage message) where TMessage : struct
        {
            _messageStore.AddMessage(message);
        }

-        internal void AddMessage<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        internal void AddMessage<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            _messageStore.AddMessage(message, time);
        }

-        internal void AddMessageIgnoringTimeDilation<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        internal void AddMessageIgnoringTimeDilation<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            _messageStore.AddMessageIgnoringTimeDilation(message, time);
        }
@ -38,32 +38,32 @@ namespace Encompass
            _messageStore.ProcessDelayedMessages(dt * _timeManager.TimeDilationFactor, dt);
        }

-        internal Span<TMessage> GetMessagesByType<TMessage>() where TMessage : struct, IMessage
+        internal ReadOnlySpan<TMessage> GetMessagesByType<TMessage>() where TMessage : struct
        {
            return _messageStore.All<TMessage>();
        }

-        internal bool Any<TMessage>() where TMessage : struct, IMessage
+        internal bool Any<TMessage>() where TMessage : struct
        {
            return _messageStore.Any<TMessage>();
        }

-        internal ref readonly TMessage First<TMessage>() where TMessage : struct, IMessage
+        internal ref readonly TMessage First<TMessage>() where TMessage : struct
        {
            return ref _messageStore.First<TMessage>();
        }

-        internal IEnumerable<TMessage> WithEntity<TMessage>(int entityID) where TMessage : struct, IMessage, IHasEntity
+        internal IEnumerable<TMessage> WithEntity<TMessage>(int entityID) where TMessage : struct, IHasEntity
        {
            return _messageStore.WithEntity<TMessage>(entityID);
        }

-        internal ref readonly TMessage WithEntitySingular<TMessage>(int entityID) where TMessage : struct, IMessage, IHasEntity
+        internal ref readonly TMessage WithEntitySingular<TMessage>(int entityID) where TMessage : struct, IHasEntity
        {
            return ref _messageStore.FirstWithEntity<TMessage>(entityID);
        }

-        internal bool SomeWithEntity<TMessage>(int entityID) where TMessage : struct, IMessage, IHasEntity
+        internal bool SomeWithEntity<TMessage>(int entityID) where TMessage : struct, IHasEntity
        {
            return _messageStore.SomeWithEntity<TMessage>(entityID);
        }
--- a/encompass-cs/RenderManager.cs
+++ b/encompass-cs/RenderManager.cs
@ -1,51 +1,27 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;

 namespace Encompass
 {
    internal class RenderManager
    {
        private readonly EntityManager _entityManager;
-        private readonly DrawLayerManager _drawLayerManager;
+        private readonly List<Renderer> renderers = new List<Renderer>();

-        private readonly Dictionary<Type, Action<Entity>> _drawComponentTypeToOrderedRenderer = new Dictionary<Type, Action<Entity>>(256);
-
-        public RenderManager(EntityManager entityManager, DrawLayerManager drawLayerManager)
+        public RenderManager(EntityManager entityManager)
        {
            _entityManager = entityManager;
-            _drawLayerManager = drawLayerManager;
        }

-        public void RegisterOrderedRenderer<TComponent>(Action<Entity> renderAction) where TComponent : struct
+        public void AddRenderer(Renderer renderer)
        {
-            _drawComponentTypeToOrderedRenderer.Add(typeof(TComponent), renderAction);
-            _drawLayerManager.RegisterOrderedDrawable<TComponent>();
+            renderers.Add(renderer);
        }

-        public void RegisterGeneralRendererWithLayer(GeneralRenderer renderer, int layer)
+        public void Draw(double dt, double alpha)
        {
-            _drawLayerManager.RegisterGeneralRendererWithLayer(renderer, layer);
-        }
-
-        public void Draw()
+            foreach (var renderer in renderers)
            {
-            foreach (var layer in _drawLayerManager.LayerOrder)
-            {
-                var generalRendererSet = _drawLayerManager.GeneralRenderersByLayer(layer);
-
-                foreach (var (entityID, componentType) in _drawLayerManager.AllInLayer(layer))
-                {
-                    if (_drawComponentTypeToOrderedRenderer.ContainsKey(componentType))
-                    {
-                        var internalRenderAction = _drawComponentTypeToOrderedRenderer[componentType];
-                        internalRenderAction(_entityManager.GetEntity(entityID));
-                    }
-                }
-
-                foreach (var generalRenderer in generalRendererSet)
-                {
-                    generalRenderer.Render();
-                }
+                renderer.Render(dt, alpha);
            }
        }
    }
--- a/encompass-cs/Renderer.cs
+++ b/encompass-cs/Renderer.cs
@ -18,37 +18,49 @@ namespace Encompass
            _componentManager = componentManager;
        }

-        protected Span<Entity> ReadEntities<TComponent>() where TComponent : struct, IComponent
+        public abstract void Render(double dt, double alpha);
+
+        protected ReadOnlySpan<Entity> ReadEntities<TComponent>() where TComponent : struct
        {
            return _componentManager.GetExistingEntities<TComponent>();
        }

-        protected ref readonly Entity ReadEntity<TComponent>() where TComponent : struct, IComponent
+        protected IEnumerable<Entity> ReadEntitiesAsEnumerable<TComponent>() where TComponent : struct
+        {
+            return _componentManager.GetExistingEntitiesAsEnumerable<TComponent>();
+        }
+
+        protected ref readonly Entity ReadEntity<TComponent>() where TComponent : struct
        {
            return ref _componentManager.ExistingSingularEntity<TComponent>();
        }

-        protected Span<TComponent> ReadComponents<TComponent>() where TComponent : struct, IComponent
+        protected ReadOnlySpan<TComponent> ReadComponents<TComponent>() where TComponent : struct
        {
            return _componentManager.GetComponentsByType<TComponent>();
        }

-        protected ref readonly TComponent ReadComponent<TComponent>() where TComponent : struct, IComponent
+        protected IEnumerable<TComponent> ReadComponentsAsEnumerable<TComponent>() where TComponent : struct
+        {
+            return _componentManager.GetComponentsByTypeEnumerable<TComponent>();
+        }
+
+        protected ref readonly TComponent ReadComponent<TComponent>() where TComponent : struct
        {
            return ref _componentManager.ExistingSingular<TComponent>();
        }

-        protected ref readonly TComponent GetComponent<TComponent>(Entity entity) where TComponent : struct, IComponent
+        protected ref readonly TComponent GetComponent<TComponent>(Entity entity) where TComponent : struct
        {
            return ref _componentManager.GetComponentByEntityAndType<TComponent>(entity.ID);
        }

-        protected bool HasComponent<TComponent>(Entity entity) where TComponent : struct, IComponent
+        protected bool HasComponent<TComponent>(Entity entity) where TComponent : struct
        {
            return _componentManager.EntityHasComponentOfType<TComponent>(entity.ID);
        }

-        protected bool SomeComponent<TComponent>() where TComponent : struct, IComponent
+        protected bool SomeComponent<TComponent>() where TComponent : struct
        {
            return _componentManager.SomeExistingComponent<TComponent>();
        }
--- a/encompass-cs/Renderers/GeneralRenderer.cs
+++ b/encompass-cs/Renderers/GeneralRenderer.cs
@ -1,11 +0,0 @@
-namespace Encompass
-{
-    /// <summary>
-    /// GeneralRenderer is a Renderer which generically reads the game state in order to draw elements to the screen.
-    /// GeneralRenderers have a layer specified when they are added to the World.
-    /// </summary>
-    public abstract class GeneralRenderer : Renderer
-    {
-        public abstract void Render();
-    }
-}
--- a/encompass-cs/Renderers/OrderedRenderer.cs
+++ b/encompass-cs/Renderers/OrderedRenderer.cs
@ -1,18 +0,0 @@
-using System;
-
-namespace Encompass
-{
-    /// <summary>
-    /// OrdereredRenderer provides a structure for the common pattern of wishing to draw a specific DrawComponent at a specific layer.
-    /// </summary>
-    public abstract class OrderedRenderer<TComponent> : Renderer where TComponent : struct, IComponent, IDrawableComponent
-    {
-        public abstract void Render(Entity entity, in TComponent drawComponent);
-
-        internal void InternalRender(Entity entity)
-        {
-            ref readonly var component = ref GetComponent<TComponent>(entity);
-            Render(entity, component);
-        }
-    }
-}
--- a/encompass-cs/UberEngine.cs
+++ b/encompass-cs/UberEngine.cs
@ -1,8 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Reflection;
-using System.Runtime.CompilerServices;

 namespace Encompass
 {
@ -16,6 +14,7 @@ namespace Encompass
        {
            _componentTypes = componentTypes;
            _messageTypes = messageTypes;
+            AddTypes.UnionWith(componentTypes);
            ReadTypes.UnionWith(componentTypes);
            WriteTypes.UnionWith(componentTypes);
            SendTypes.UnionWith(messageTypes);
@ -28,7 +27,8 @@ namespace Encompass

            foreach (var type in _componentTypes)
            {
-                var instanceParam = new object[] { Entity, Activator.CreateInstance(type) };
+                var instance = Activator.CreateInstance(type);
+                var instanceParam = new object[] { Entity, instance };
                var setComponentMethod = typeof(Engine).GetMethod("SetComponent", BindingFlags.NonPublic | BindingFlags.Instance);
                var genericSetComponentMethod = setComponentMethod.MakeGenericMethod(type);
                genericSetComponentMethod.Invoke(this, instanceParam);
@ -55,7 +55,7 @@ namespace Encompass

        // we can't reflect invoke on byref returns or Span returns right now... so we have non-return wrapper methods

-        protected void CallAllComponentMethods<TComponent>() where TComponent : struct, IComponent
+        protected void CallAllComponentMethods<TComponent>() where TComponent : struct
        {
            ReadComponent<TComponent>();
            ReadComponents<TComponent>();
@ -70,7 +70,7 @@ namespace Encompass
            AddComponent<TComponent>(Entity, default);
        }

-        protected void CallAllMessageMethods<TMessage>() where TMessage : struct, IMessage
+        protected void CallAllMessageMethods<TMessage>() where TMessage : struct
        {
            SendMessageIgnoringTimeDilation<TMessage>(default, 0.1);
            SendMessage<TMessage>(default);
@ -80,7 +80,7 @@ namespace Encompass
            SomeMessage<TMessage>();
        }

-        protected void CallAllEntityMessageMethods<TMessage>() where TMessage : struct, IMessage, IHasEntity
+        protected void CallAllEntityMessageMethods<TMessage>() where TMessage : struct, IHasEntity
        {
            ReadMessagesWithEntity<TMessage>(Entity);
            ReadMessageWithEntity<TMessage>(Entity);
--- a/encompass-cs/UberRenderer.cs
+++ b/encompass-cs/UberRenderer.cs
@ -20,7 +20,7 @@ namespace Encompass
        }

        // can't reflect invoke on Span returns...
-        public void Render()
+        public override void Render(double dt, double alpha)
        {
            foreach (var type in _componentTypes)
            {
@ -28,7 +28,7 @@ namespace Encompass
            }
        }

-        protected void CallAllComponentMethods<TComponent>() where TComponent : struct, IComponent
+        protected void CallAllComponentMethods<TComponent>() where TComponent : struct
        {
            ReadEntity<TComponent>();
            ReadEntities<TComponent>();
--- a/encompass-cs/World.cs
+++ b/encompass-cs/World.cs
@ -69,9 +69,9 @@ namespace Encompass
        /// <summary>
        /// Causes the Renderers to draw.
        /// </summary>
-        public void Draw()
+        public void Draw(double dt, double alpha)
        {
-            _renderManager.Draw();
+            _renderManager.Draw(dt, alpha);
        }
    }
 }
--- a/encompass-cs/WorldBuilder.cs
+++ b/encompass-cs/WorldBuilder.cs
@ -3,8 +3,6 @@ using System.Collections.Generic;
 using System.Reflection;
 using System.Linq;
 using Encompass.Exceptions;
-using MoonTools.Core.Graph;
-using MoonTools.Core.Graph.Extensions;

 namespace Encompass
 {
@ -20,7 +18,7 @@ namespace Encompass
    {
        private readonly int _entityCapacity;
        private readonly List<Engine> _engines = new List<Engine>();
-        private readonly DirectedGraph<Engine, Unit> _engineGraph = GraphBuilder.DirectedGraph<Engine>();
+        private readonly DirectedGraph<Engine> _engineGraph = new DirectedGraph<Engine>();
        private readonly ComponentStore _startingExistingComponentStore;
        private readonly ComponentStore _startingUpToDateComponentStore;

@ -28,7 +26,6 @@ namespace Encompass
        private readonly EntityManager _entityManager;
        private readonly MessageManager _messageManager;
        private readonly TimeManager _timeManager;
-        private readonly DrawLayerManager _drawLayerManager;
        private readonly RenderManager _renderManager;
        private readonly TrackingManager _trackingManager;

@ -38,18 +35,15 @@ namespace Encompass
        private readonly HashSet<Type> _messageTypes = new HashSet<Type>();
        private readonly Dictionary<Type, int> _typeToIndex = new Dictionary<Type, int>();

-        private bool _rendererRegistered = false;
-
        public WorldBuilder(int entityCapacity = 32768)
        {
            _entityCapacity = entityCapacity;
-            _drawLayerManager = new DrawLayerManager();
            _timeManager = new TimeManager();
            _trackingManager = new TrackingManager();
-            _componentManager = new ComponentManager(_drawLayerManager, _typeToIndex);
+            _componentManager = new ComponentManager(_typeToIndex);
            _messageManager = new MessageManager(_timeManager);
            _entityManager = new EntityManager(_componentManager, entityCapacity);
-            _renderManager = new RenderManager(_entityManager, _drawLayerManager);
+            _renderManager = new RenderManager(_entityManager);

            _startingExistingComponentStore = new ComponentStore(_typeToIndex);
            _startingUpToDateComponentStore = new ComponentStore(_typeToIndex);
@ -66,7 +60,7 @@ namespace Encompass
        /// <summary>
        /// Specifies that the given Message should be sent immediately on the first World Update.
        /// </summary>
-        public void SendMessage<TMessage>(in TMessage message) where TMessage : struct, IMessage
+        public void SendMessage<TMessage>(in TMessage message) where TMessage : struct
        {
            _messageManager.AddMessage(message);
        }
@ -74,7 +68,7 @@ namespace Encompass
        /// <summary>
        /// Specifies that the given Message should be sent after the specified number of seconds after the first World Update.
        /// </summary>
-        public void SendMessage<TMessage>(in TMessage message, double time) where TMessage : struct, IMessage
+        public void SendMessage<TMessage>(in TMessage message, double time) where TMessage : struct
        {
            _messageManager.AddMessage<TMessage>(message, time);
        }
@ -87,12 +81,13 @@ namespace Encompass
            RegisterComponentType<TComponent>();
            _startingExistingComponentStore.Set(entity.ID, component);
            _startingUpToDateComponentStore.Set(entity.ID, component);
-
-            if (component is IDrawableComponent drawableComponent)
-            {
-                _componentManager.RegisterDrawableComponent<TComponent>(entity.ID, drawableComponent.Layer);
-                _drawLayerManager.RegisterOrderedDrawable<TComponent>();
        }
+
+        internal void RegisterComponentTypeNonGeneric(Type type)
+        {
+            var method = GetType().GetMethod("RegisterComponentType", BindingFlags.NonPublic | BindingFlags.Instance);
+            var generic = method.MakeGenericMethod(type);
+            generic.Invoke(this, null);
        }

        internal void RegisterComponentType<TComponent>() where TComponent : struct
@ -130,16 +125,29 @@ namespace Encompass
            var messageReceiveTypes = engine.ReceiveTypes;
            var messageSendTypes = engine.SendTypes;

-            RegisterMessageTypes(engine.ReceiveTypes.Union(engine.SendTypes));
+            RegisterMessageTypes(engine.ReceiveTypes);
+            RegisterMessageTypes(engine.SendTypes);

-            foreach (var writeImmediateType in engine.WriteImmediateTypes.Intersect(engine.ReadImmediateTypes))
+            foreach (var writeImmediateType in engine.WriteImmediateTypes)
+            {
+                foreach (var readImmediateType in engine.ReadImmediateTypes)
+                {
+                    if (readImmediateType == writeImmediateType)
                    {
                        throw new EngineSelfCycleException("Engine {0} both writes and reads immediate Component {1}", engine.GetType().Name, writeImmediateType.Name);
                    }
+                }
+            }

-            foreach (var messageType in messageReceiveTypes.Intersect(messageSendTypes))
+            foreach (var messageReceiveType in messageReceiveTypes)
            {
-                throw new EngineSelfCycleException("Engine {0} both receives and sends Message {1}", engine.GetType().Name, messageType.Name);
+                foreach (var messageSendType in messageSendTypes)
+                {
+                    if (messageReceiveType == messageSendType)
+                    {
+                        throw new EngineSelfCycleException("Engine {0} both receives and sends Message {1}", engine.GetType().Name, messageReceiveType.Name);
+                    }
+                }
            }

            if (messageSendTypes.Count > 0 || engine.WriteImmediateTypes.Count > 0)
@ -147,7 +155,27 @@ namespace Encompass
                _senders.Add(engine);
            }

-            foreach (var componentType in engine.QueryWithTypes.Union(engine.QueryWithoutTypes))
+            foreach (var componentType in engine.ReadTypes)
+            {
+                RegisterComponentTypeNonGeneric(componentType);
+            }
+
+            foreach (var componentType in engine.AddTypes)
+            {
+                RegisterComponentTypeNonGeneric(componentType);
+            }
+
+            foreach (var componentType in engine.WriteTypes)
+            {
+                RegisterComponentTypeNonGeneric(componentType);
+            }
+
+            foreach (var componentType in engine.WriteImmediateTypes)
+            {
+                RegisterComponentTypeNonGeneric(componentType);
+            }
+
+            foreach (var componentType in engine.QueryWithTypes)
            {
                _trackingManager.RegisterComponentTypeToEngine(componentType, engine);
                if (engine.ReadImmediateTypes.Contains(componentType))
@ -156,7 +184,26 @@ namespace Encompass
                }
            }

-            foreach (var receiveType in engine.ReceiveTypes.Union(engine.ReadImmediateTypes))
+            foreach (var componentType in engine.QueryWithoutTypes)
+            {
+                _trackingManager.RegisterComponentTypeToEngine(componentType, engine);
+                if (engine.ReadImmediateTypes.Contains(componentType))
+                {
+                    _trackingManager.RegisterImmediateComponentTypeToEngine(componentType, engine);
+                }
+            }
+
+            foreach (var receiveType in engine.ReceiveTypes)
+            {
+                if (!_typeToReaders.ContainsKey(receiveType))
+                {
+                    _typeToReaders.Add(receiveType, new HashSet<Engine>());
+                }
+
+                _typeToReaders[receiveType].Add(engine);
+            }
+
+            foreach (var receiveType in engine.ReadImmediateTypes)
            {
                if (!_typeToReaders.ContainsKey(receiveType))
                {
@ -170,51 +217,37 @@ namespace Encompass
        }

        /// <summary>
-        /// Registers a draw layer. This must be done before any Renderers are registered.
+        /// Adds the specified Renderer to the World.
        /// </summary>
-        /// <param name="layer">The draw layer to register.</param>
-        public void RegisterDrawLayer(int layer)
+        public void AddRenderer(Renderer renderer)
        {
-            if (_rendererRegistered) 
-            { 
-                throw new IllegalDrawLayerException("Cannot register a draw layer after a Renderer has been registered.");
-            }
-            _drawLayerManager.RegisterDrawLayer(layer);
-        }
-
-        /// <summary>
-        /// Adds the specified OrderedRenderer to the World.
-        /// </summary>
-        public OrderedRenderer<TComponent> AddOrderedRenderer<TComponent>(OrderedRenderer<TComponent> renderer) where TComponent : struct, IComponent, IDrawableComponent
-        {
-            RegisterComponentType<TComponent>();
-            renderer.AssignEntityManager(_entityManager);
            renderer.AssignComponentManager(_componentManager);
-            _renderManager.RegisterOrderedRenderer<TComponent>(renderer.InternalRender);
-            _rendererRegistered = true;
-            return renderer;
-        }
-
-        /// <summary>
-        /// Adds the specified GeneralRenderer to the World at the specified layer.
-        /// Higher layer numbers draw on top of lower layer numbers.
-        /// </summary>
-        /// <param name="renderer">An instance of a GeneralRenderer.</param>
-        /// <param name="layer">The layer at which the GeneralRenderer should render. Higher numbers draw over lower numbers.</param>
-        public TRenderer AddGeneralRenderer<TRenderer>(TRenderer renderer, int layer) where TRenderer : GeneralRenderer
-        {
            renderer.AssignEntityManager(_entityManager);
-            renderer.AssignComponentManager(_componentManager);
-            _renderManager.RegisterGeneralRendererWithLayer(renderer, layer);
-            _rendererRegistered = true;
-            return renderer;
+            _renderManager.AddRenderer(renderer);
        }

        private void BuildEngineGraph()
        {
            foreach (var senderEngine in _senders)
            {
-                foreach (var messageType in senderEngine.SendTypes.Union(senderEngine.WriteImmediateTypes))
+                foreach (var messageType in senderEngine.SendTypes)
+                {
+                    if (_typeToReaders.ContainsKey(messageType))
+                    {
+                        foreach (var readerEngine in _typeToReaders[messageType])
+                        {
+                            if (senderEngine != readerEngine)
+                            {
+                                if (!_engineGraph.Exists(senderEngine, readerEngine))
+                                {
+                                    _engineGraph.AddEdge(senderEngine, readerEngine);
+                                }
+                            }
+                        }
+                    }
+                }
+
+                foreach (var messageType in senderEngine.WriteImmediateTypes)
                {
                    if (_typeToReaders.ContainsKey(messageType))
                    {
@ -394,39 +427,20 @@ namespace Encompass
        {
            var dummyTimeManager = new TimeManager();
            var dummyMessageManager = new MessageManager(dummyTimeManager);
-            var dummyDrawLayerManager = new DrawLayerManager();
            var dummyTrackingManager = new TrackingManager();
-            var dummyComponentManager = new ComponentManager(dummyDrawLayerManager, _typeToIndex);
+            var dummyComponentManager = new ComponentManager(_typeToIndex);
            var dummyEntityManager = new EntityManager(dummyComponentManager, _entityCapacity);
-            var dummyRenderManager = new RenderManager(dummyEntityManager, dummyDrawLayerManager);
+            var dummyRenderManager = new RenderManager(dummyEntityManager);

-            // doing reflection to grab all component types, because not all writes need to be declared
-            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
-            {
-                foreach (var componentType in assembly.GetTypes())
-                {
-                    if (typeof(IComponent).IsAssignableFrom(componentType) && componentType.IsValueType && !componentType.IsEnum && !componentType.IsPrimitive)
-                    {
-                        var method = typeof(WorldBuilder).GetMethod("RegisterComponentType", BindingFlags.NonPublic | BindingFlags.Instance);
-                        var generic = method.MakeGenericMethod(componentType);
-                        generic.Invoke(this, null);
+            var prepEngineOrder = new List<Engine>();

+            foreach (var componentType in _componentTypesToPreload)
+            {
                var dummyRegisterMethod = typeof(ComponentManager).GetMethod("RegisterComponentType", BindingFlags.Public | BindingFlags.Instance);
                var dummyGeneric = dummyRegisterMethod.MakeGenericMethod(componentType);
                dummyGeneric.Invoke(dummyComponentManager, null);
            }

-                    if (componentType.GetInterface("IDrawableComponent") != null)
-                    {
-                        var drawLayerManagerRegisterMethod = typeof(DrawLayerManager).GetMethod("RegisterOrderedDrawable");
-                        var drawLayerManagerRegisterGenericMethod = drawLayerManagerRegisterMethod.MakeGenericMethod(componentType);
-                        drawLayerManagerRegisterGenericMethod.Invoke(dummyDrawLayerManager, null);
-                    }
-                }
-            }
-
-            var prepEngineOrder = new List<Engine>();
-
            var uberEngine = new UberEngine(_componentTypesToPreload, messageTypes);

            uberEngine.AssignEntityManager(dummyEntityManager);
@ -460,7 +474,7 @@ namespace Encompass
            dummyComponentManager.WriteComponents();

            uberRenderer.SetEntity(uberEngine.Entity);
-            uberRenderer.Render();
+            uberRenderer.Render(1, 0);
        }
    }
 }
--- a/encompass-cs/encompass-cs.csproj
+++ b/encompass-cs/encompass-cs.csproj
@ -5,18 +5,19 @@
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
    <RootNamespace>Encompass</RootNamespace>
    <PackageId>EncompassECS.Framework</PackageId>
-    <Version>0.21.1</Version>
+    <Version>0.23.0</Version>
    <Authors>Evan Hemsley</Authors>
    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
    <Company>Moonside Games</Company>
    <Product>Encompass ECS</Product>
    <PackageProjectUrl>https://github.com/encompass-ecs</PackageProjectUrl>
    <PackageLicenseUrl />
-    <Copyright>Evan Hemsley 2019</Copyright>
-    <Description>Encompass is an engine-agnostic Hyper ECS framework to help you code games, or other kinds of simulations.</Description>
+    <Copyright>Evan Hemsley 2020</Copyright>
+    <Description>Encompass is an engine-agnostic MECS framework to help you code games, or other kinds of simulations.</Description>
    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
    <AssemblyName>EncompassECS.Framework</AssemblyName>
    <PackageLicenseFile>LICENSE</PackageLicenseFile>
+    <Platforms>x64;x86</Platforms>
  </PropertyGroup>
  <ItemGroup>
    <None Include="..\LICENSE">
@ -25,8 +26,6 @@
    </None>
  </ItemGroup>
  <ItemGroup>
-    <PackageReference Include="MoonTools.Core.Graph" Version="1.0.0" />
-    <PackageReference Include="MoonTools.FastCollections" Version="1.0.0" />
    <PackageReference Include="System.Collections.Immutable" Version="1.7.0" />
    <PackageReference Include="Microsoft.Bcl.HashCode" Version="1.1.0" />
  </ItemGroup>
--- a/test/ComponentTest.cs
+++ b/test/ComponentTest.cs
@ -8,12 +8,12 @@ namespace Tests
 {
    public class ComponentTests
    {
-        struct MockComponent : IComponent
+        struct MockComponent
        {
            public int myInt;
        }

-        struct EntityMessage : IMessage
+        struct EntityMessage
        {
            public Entity entity;
        }
@ -33,7 +33,7 @@ namespace Tests
            }
        }

-        struct AddComponentTestMessage : IMessage
+        struct AddComponentTestMessage
        {
            public Entity entity;
            public MockComponent mockComponent;
@ -62,8 +62,6 @@ namespace Tests

            var entity = worldBuilder.CreateEntity();

-            const string MyString = "hello";
-
            MockComponent mockComponent;
            mockComponent.myInt = 3;

@ -174,7 +172,7 @@ namespace Tests
            Assert.DoesNotThrow(() => world.Update(0.01));
        }

-        struct AddMockComponentMessage : IMessage
+        struct AddMockComponentMessage
        {
            public Entity entity;
            public MockComponent mockComponent;
@ -271,7 +269,7 @@ namespace Tests

            Assert.AreEqual(mockComponent, gottenMockComponent);
        }
-        struct HasComponentTestMessage : IMessage
+        struct HasComponentTestMessage
        {
            public Entity entity;
        }
@ -369,7 +367,7 @@ namespace Tests
            Assert.IsFalse(hasComponentRuntimeTypeResult);
        }

-        struct RemoveComponentTestMessage : IMessage
+        struct RemoveComponentTestMessage
        {
            public Entity entity;
        }
@ -463,7 +461,7 @@ namespace Tests
            hasComponentResult.Should().BeFalse();
        }

-        struct CheckHasMockComponentMessage : IMessage
+        struct CheckHasMockComponentMessage
        {
            public Entity entity;
            public bool shouldHaveComponent;
--- a/test/EngineTest.cs
+++ b/test/EngineTest.cs
@ -10,17 +10,18 @@ using Encompass.Exceptions;

 namespace Tests
 {
-    struct MockComponent : IComponent
+    struct MockComponent
    {
        public int myInt;
    }

    public class EngineTest
    {
-        static MockComponent[] resultComponents;
        static MockComponent resultComponent;
+        static MockComponent[] resultComponents = new MockComponent[1];

-        static MockMessage[] resultMessages;
+        static MockMessage resultMessage;
+        static MockMessage[] resultMessages = new MockMessage[1];

        [Reads(typeof(MockComponent))]
        public class ReadComponentsTestEngine : Engine
@ -149,6 +150,17 @@ namespace Tests
            Assert.AreEqual(mockComponent, resultComponent);
        }

+        [Test]
+        public void ReadComponentThrowsWhenNoneExist()
+        {
+            var worldBuilder = new WorldBuilder();
+            worldBuilder.AddEngine(new ReadComponentTestEngine());
+
+            var world = worldBuilder.Build();
+
+            Assert.Throws<NoComponentOfTypeException>(() => world.Update(0.01f), "No component of type MockComponent exists");
+        }
+
        [Test]
        public void ReadComponentWhenMultipleComponents()
        {
@ -259,7 +271,7 @@ namespace Tests
            Assert.That(ex.Message, Is.EqualTo("Engine UndeclaredUpdateComponentTestEngine tried to update undeclared Component MockComponent"));
        }

-        struct MockMessage : IMessage
+        struct MockMessage
        {
            public string myString;
        }
@ -277,7 +289,7 @@ namespace Tests
        }

        [Receives(typeof(MockMessage))]
-        public class MessageReadEngine : Engine
+        public class ReadMessagesEngine : Engine
        {
            public override void Update(double dt)
            {
@ -285,18 +297,38 @@ namespace Tests
            }
        }

+        [Receives(typeof(MockMessage))]
+        public class ReadMessageEngine : Engine
+        {
+            public override void Update(double dt)
+            {
+                resultMessage = ReadMessage<MockMessage>();
+            }
+        }
+
        [Test]
        public void EmitAndReadMessage()
        {
            var worldBuilder = new WorldBuilder();
            worldBuilder.AddEngine(new MessageEmitEngine());
-            worldBuilder.AddEngine(new MessageReadEngine());
+            worldBuilder.AddEngine(new ReadMessageEngine());

            var world = worldBuilder.Build();

            world.Update(0.01f);

-            Assert.AreEqual(resultMessages.First().myString, "howdy");
+            Assert.AreEqual(resultMessage.myString, "howdy");
+        }
+
+        [Test]
+        public void ReadMessageThrowsWhenNoneOfTypeExist()
+        {
+            var worldBuilder = new WorldBuilder();
+            worldBuilder.AddEngine(new ReadMessageEngine());
+
+            var world = worldBuilder.Build();
+
+            Assert.Throws<NoMessageOfTypeException>(() => world.Update(0.01), "No Message of type MockMessage exists");
        }

        public class UndeclaredMessageEmitEngine : Engine
@ -403,7 +435,7 @@ namespace Tests
            Assert.Throws<IllegalReadException>(() => world.Update(0.01f));
        }

-        struct EntityMessage : IMessage, IHasEntity
+        struct EntityMessage : IHasEntity
        {
            public EntityMessage(Entity entity, int myInt)
            {
@ -618,7 +650,7 @@ namespace Tests
            world.Update(0.01f);
        }

-        struct DestroyerComponent : IComponent { }
+        struct DestroyerComponent { }

        [Reads(typeof(DestroyerComponent))]
        class DestroyerEngine : Engine
@ -810,7 +842,7 @@ namespace Tests
            var worldBuilder = new WorldBuilder();
            worldBuilder.AddEngine(new ActivateTimeDilationEngine());
            worldBuilder.AddEngine(new DelayedMessageEngine());
-            worldBuilder.AddEngine(new MessageReadEngine());
+            worldBuilder.AddEngine(new ReadMessagesEngine());

            var entity = worldBuilder.CreateEntity();
            worldBuilder.SetComponent(entity, new MockComponent { });
@ -857,7 +889,7 @@ namespace Tests
            var worldBuilder = new WorldBuilder();
            worldBuilder.AddEngine(new ActivateTimeDilationEngine());
            worldBuilder.AddEngine(new DelayedMessageIgnoringTimeDilationEngine());
-            worldBuilder.AddEngine(new MessageReadEngine());
+            worldBuilder.AddEngine(new ReadMessagesEngine());

            var entity = worldBuilder.CreateEntity();
            worldBuilder.SetComponent(entity, new MockComponent { });
@ -923,7 +955,7 @@ namespace Tests
            resultComponents.Should().BeEmpty();
        }

-        struct DestroyComponentMessage : IMessage { public Entity entity; }
+        struct DestroyComponentMessage { public Entity entity; }

        [Reads(typeof(MockComponent))]
        [Writes(typeof(MockComponent))]
@ -950,7 +982,7 @@ namespace Tests
        }

        [Test]
-        public void GetEntityByComponentType()
+        public void ReadEntity()
        {
            var worldBuilder = new WorldBuilder();
            worldBuilder.AddEngine(new ReadEntityByComponentTypeEngine());
@ -964,7 +996,18 @@ namespace Tests
            entity.Should().BeEquivalentTo(readEntity);
        }

-        struct MockComponentB : IComponent
+        [Test]
+        public void ReadEntityThrowsWhenNoComponentOfTypeExists()
+        {
+            var worldBuilder = new WorldBuilder();
+            worldBuilder.AddEngine(new ReadEntityByComponentTypeEngine());
+
+            var world = worldBuilder.Build();
+
+            Assert.Throws<NoComponentOfTypeException>(() => world.Update(0.01), "No component of type MockComponent exists");
+        }
+
+        struct MockComponentB
        {
            private int value;

@ -1281,6 +1324,7 @@ namespace Tests
            undilatedDeltaTime.Should().Be(0.5);
        }

+        [Adds(typeof(MockComponent))]
        class AddComponentWithoutPriorityEngine : Engine
        {
            public override void Update(double dt)
@ -1337,6 +1381,7 @@ namespace Tests
            Assert.Throws<IllegalWriteException>(() => world.Update(0.01));
        }

+        [Adds(typeof(MockComponentB))]
        [WritesImmediate(typeof(MockComponentB))]
        class AddImmediateComponentEngine : Engine
        {
@ -1407,11 +1452,10 @@ namespace Tests

        public class QueryTests
        {
-            struct MockComponentB : IComponent { }
-            struct MockComponentC : IComponent { }
-            struct MockComponentD : IComponent { }
+            struct MockComponentB { }
+            struct MockComponentC { }
+            struct MockComponentD { }

-            [Reads(typeof(MockComponent), typeof(MockComponentB))]
            [Writes(typeof(MockComponentB))]
            [QueryWith(typeof(MockComponent), typeof(MockComponentB))]
            class EntityQueryWithComponentsEngine : Engine
@ -1465,7 +1509,6 @@ namespace Tests
                queriedEntities.Should().BeEmpty();
            }

-            [Reads(typeof(MockComponent))]
            [Writes(typeof(MockComponent))]
            [QueryWithout(typeof(MockComponent))]
            class EntityQueryWithoutComponentsEngine : Engine
@ -1519,7 +1562,6 @@ namespace Tests
                queriedEntities.Should().BeEmpty();
            }

-            [Reads(typeof(MockComponent), typeof(MockComponentB), typeof(MockComponentD))]
            [QueryWith(typeof(MockComponent), typeof(MockComponentB))]
            [QueryWithout(typeof(MockComponentD))]
            class EntityQueryWithandWithoutComponentsEngine : Engine
@ -1745,7 +1787,6 @@ namespace Tests
            }

            [ReadsImmediate(typeof(MockComponentB))]
-            [Reads(typeof(MockComponent))]
            [QueryWith(typeof(MockComponent), typeof(MockComponentB))]
            class EntityQueryWithImmediateAndNonImmediateComponents : Engine
            {
@ -1863,7 +1904,7 @@ namespace Tests
                _components.Should().NotBeEmpty();
            }

-            struct MockTimerComponent : IComponent
+            struct MockTimerComponent
            {
                public double Timer { get; }

--- a/test/OrderedRendererTest.cs
+++ b/test/OrderedRendererTest.cs
@ -1,109 +0,0 @@
-using System;
-
-using NUnit.Framework;
-using FluentAssertions;
-using Encompass;
-using System.Collections.Generic;
-
-namespace Tests
-{
-    public class OrderedRendererTest
-    {
-        struct AComponent : IComponent { }
-        struct BComponent : IComponent { }
-        struct CComponent : IComponent { }
-
-        struct TestDrawComponent : IComponent, IDrawableComponent
-        {
-            public int Layer { get; set; }
-        }
-
-        class TestRenderer : OrderedRenderer<TestDrawComponent>
-        {
-            public override void Render(Entity entity, in TestDrawComponent testDrawComponent) { }
-        }
-
-        static bool called = false;
-        class DeactivatedRenderer : TestRenderer
-        {
-            public override void Render(Entity entity, in TestDrawComponent testDrawComponent)
-            {
-                called = true;
-            }
-        }
-
-        static bool calledOnDraw = false;
-        static (TestDrawComponent, Entity) resultComponent;
-
-        class CalledRenderer : OrderedRenderer<TestDrawComponent>
-        {
-            public override void Render(Entity entity, in TestDrawComponent testDrawComponent)
-            {
-                resultComponent = (testDrawComponent, entity);
-                calledOnDraw = true;
-            }
-        }
-
-        [Test]
-        public void RenderMethodCalledOnWorldDraw()
-        {
-            var worldBuilder = new WorldBuilder();
-            worldBuilder.RegisterDrawLayer(2);
-
-            var renderer = worldBuilder.AddOrderedRenderer(new CalledRenderer());
-
-            AComponent aComponent;
-            CComponent cComponent;
-
-            var testDrawComponent = new TestDrawComponent { Layer = 2 };
-
-            var entity = worldBuilder.CreateEntity();
-            worldBuilder.SetComponent(entity, aComponent);
-            worldBuilder.SetComponent(entity, cComponent);
-            worldBuilder.SetComponent(entity, testDrawComponent);
-
-            var world = worldBuilder.Build();
-
-            world.Update(0.01f);
-            world.Draw();
-
-            Assert.IsTrue(calledOnDraw);
-            resultComponent.Should().BeEquivalentTo((testDrawComponent, entity));
-        }
-
-        [Reads(typeof(TestDrawComponent))]
-        class DestroyerEngine : Engine
-        {
-            public override void Update(double dt)
-            {
-                foreach (var entity in ReadEntities<TestDrawComponent>())
-                {
-                    Destroy(entity);
-                }
-            }
-        }
-        [Test]
-        public void RenderMethodNotCalledAfterDestroy()
-        {
-            calledOnDraw = false;
-
-            var worldBuilder = new WorldBuilder();
-            worldBuilder.RegisterDrawLayer(1);
-
-            worldBuilder.AddEngine(new DestroyerEngine());
-            var renderer = worldBuilder.AddOrderedRenderer(new CalledRenderer());
-
-            TestDrawComponent testDrawComponent = new TestDrawComponent { Layer = 1 };
-
-            var entity = worldBuilder.CreateEntity();
-            worldBuilder.SetComponent(entity, testDrawComponent);
-
-            var world = worldBuilder.Build();
-
-            world.Update(0.01);
-            world.Draw();
-
-            Assert.IsFalse(calledOnDraw);
-        }
-    }
-}
--- a/test/GeneralRendererTest.cs
+++ b/test/GeneralRendererTest.cs
@ -5,15 +5,15 @@ namespace Tests
 {
    public static class GeneralRendererTest
    {
-        struct AComponent : IComponent { }
+        struct AComponent { }

        public class SingletonRead
        {
            static (AComponent, Entity) result;

-            class TestRenderer : GeneralRenderer
+            class TestRenderer : Renderer
            {
-                public override void Render()
+                public override void Render(double dt, double alpha)
                {
                    ref readonly var entity = ref ReadEntity<AComponent>();
                    result = (GetComponent<AComponent>(entity), entity);
@ -24,7 +24,7 @@ namespace Tests
            public void SingletonComponent()
            {
                var worldBuilder = new WorldBuilder();
-                worldBuilder.AddGeneralRenderer(new TestRenderer(), 1);
+                worldBuilder.AddRenderer(new TestRenderer());

                AComponent aComponent;

@ -34,10 +34,10 @@ namespace Tests
                var world = worldBuilder.Build();

                world.Update(0.01f);
-                world.Draw();
+                world.Draw(0.01f, 0);

                world.Update(0.01);
-                world.Draw();
+                world.Draw(0.01f, 0);

                Assert.That(result, Is.EqualTo((aComponent, entity)));
            }
@ -46,7 +46,7 @@ namespace Tests
            public void MultipleComponents()
            {
                var worldBuilder = new WorldBuilder();
-                worldBuilder.AddGeneralRenderer(new TestRenderer(), 1);
+                worldBuilder.AddRenderer(new TestRenderer());

                AComponent aComponent;
                AComponent aComponentTwo;
@ -59,10 +59,10 @@ namespace Tests
                var world = worldBuilder.Build();

                world.Update(0.01f);
-                world.Draw();
+                world.Draw(0.01f, 0);

                world.Update(0.01f);
-                world.Draw();
+                world.Draw(0.01f, 0);

                Assert.That(result, Is.EqualTo((aComponent, entity)).Or.EqualTo((aComponentTwo, entityB)));
            }
--- a/test/SpawnerTest.cs
+++ b/test/SpawnerTest.cs
@ -5,8 +5,8 @@ namespace Tests
 {
    public class SpawnerTest
    {
-        struct TestComponent : IComponent { }
-        struct SpawnMessageA : IMessage { }
+        struct TestComponent { }
+        struct SpawnMessageA { }

        static Entity resultEntity;

@ -23,7 +23,7 @@ namespace Tests
        [Writes(typeof(TestComponent))]
        class TestSpawner : Spawner<SpawnMessageA>
        {
-            protected override void Spawn(SpawnMessageA message)
+            protected override void Spawn(in SpawnMessageA message)
            {
                resultEntity = CreateEntity();
                SetComponent(resultEntity, new TestComponent());
--- a/test/WorldBuilderTest.cs
+++ b/test/WorldBuilderTest.cs
@ -13,8 +13,8 @@ namespace Tests
    {
        public class EngineCycleSimple
        {
-            struct AMessage : IMessage { }
-            struct BMessage : IMessage { }
+            struct AMessage { }
+            struct BMessage { }

            [Receives(typeof(AMessage))]
            [Sends(typeof(BMessage))]
@ -51,10 +51,10 @@ namespace Tests

        public class EngineCycleComplex
        {
-            struct AMessage : IMessage { }
-            struct BMessage : IMessage { }
-            struct CMessage : IMessage { }
-            struct DMessage : IMessage { }
+            struct AMessage { }
+            struct BMessage { }
+            struct CMessage { }
+            struct DMessage { }

            [Receives(typeof(AMessage))]
            [Sends(typeof(BMessage))]
@ -142,12 +142,12 @@ namespace Tests

        public class MultipleEngineWriteWithPriority
        {
-            struct SetMessage : IMessage
+            struct SetMessage
            {
                public Entity entity;
            }

-            struct AComponent : IComponent
+            struct AComponent
            {
                public int myInt;
            }
@ -211,12 +211,12 @@ namespace Tests

        public class DefaultWritePriority
        {
-            struct SetMessage : IMessage
+            struct SetMessage
            {
                public Entity entity;
            }

-            struct AComponent : IComponent
+            struct AComponent
            {
                public int myInt;
            }
@ -298,7 +298,7 @@ namespace Tests

        public class EngineMessageSelfCycle
        {
-            struct AMessage : IMessage { }
+            struct AMessage { }

            [Receives(typeof(AMessage))]
            [Sends(typeof(AMessage))]
@ -319,28 +319,6 @@ namespace Tests
            }
        }

-        public class IllegalWriteType
-        {
-            struct ANonMessage { }
-
-            [Sends(typeof(ANonMessage))]
-            class MyEngine : Engine
-            {
-                public override void Update(double dt)
-                {
-
-                }
-            }
-
-            [Test]
-            public void ThrowsError()
-            {
-                var worldBuilder = new WorldBuilder();
-
-                Assert.Throws<IllegalSendTypeException>(() => worldBuilder.AddEngine(new MyEngine()), "ANonMessage must be a Message or Component");
-            }
-        }
-
        public class PriorityConflict
        {
            [Writes(typeof(MockComponent), 2)]
@ -407,13 +385,13 @@ namespace Tests
        {
            static List<Engine> order = new List<Engine>();

-            struct AComponent : IComponent { }
-            struct BComponent : IComponent { }
+            struct AComponent { }
+            struct BComponent { }

-            struct AMessage : IMessage { }
-            struct BMessage : IMessage { }
-            struct CMessage : IMessage { }
-            struct DMessage : IMessage { }
+            struct AMessage { }
+            struct BMessage { }
+            struct CMessage { }
+            struct DMessage { }

            [Sends(typeof(AMessage))]
            class AEngine : Engine
@ -520,8 +498,8 @@ namespace Tests
        {
            static List<Engine> order = new List<Engine>();

-            struct AMessage : IMessage { }
-            struct BMessage : IMessage { }
+            struct AMessage { }
+            struct BMessage { }

            [Sends(typeof(AMessage), typeof(BMessage))]
            class AEngine : Engine
@ -558,38 +536,5 @@ namespace Tests
                Assert.That(order.IndexOf(engineA), Is.LessThan(order.IndexOf(engineB)));
            }
        }
-
-        public class DrawLayerRegister
-        {
-            struct AComponent : IComponent, IDrawableComponent
-            {
-                public int Layer { get; set; }
-            }
-
-            class ARenderer : OrderedRenderer<AComponent>
-            {
-
-                public override void Render(Entity entity, in AComponent drawComponent) { }
-            }
-
-            [Test]
-            public void DrawLayerRegisterAfterOrderedRendererRegisterThrows()
-            {
-                var worldBuilder = new WorldBuilder();
-
-                var rendererA = worldBuilder.AddOrderedRenderer(new ARenderer());
-
-                Assert.Throws<IllegalDrawLayerException>(() => worldBuilder.RegisterDrawLayer(1));
-            }
-
-            [Test]
-            public void DrawLayerRegisterBeforeOrderedRendererDoesNotThrow()
-            {
-                var worldBuilder = new WorldBuilder();
-
-                Assert.DoesNotThrow(() => worldBuilder.RegisterDrawLayer(1));
-                Assert.DoesNotThrow(() => worldBuilder.AddOrderedRenderer(new ARenderer()));
-            }
-        }
    }
 }
--- a/test/WorldTest.cs
+++ b/test/WorldTest.cs
@ -1,81 +0,0 @@
-using NUnit.Framework;
-using FluentAssertions;
-
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-using Encompass;
-
-namespace Tests
-{
-    public class WorldTest
-    {
-        struct TestComponent : IComponent { }
-        struct TestDrawComponent : IComponent, IDrawableComponent
-        {
-            public int Layer { get; set; }
-        }
-
-        static List<object> drawOrder = new List<object>();
-
-        class TestEntityRenderer : OrderedRenderer<TestDrawComponent>
-        {
-            public override void Render(Entity entity, in TestDrawComponent testDrawComponent)
-            {
-                drawOrder.Add(entity);
-            }
-        }
-
-        class TestGeneralRenderer : GeneralRenderer
-        {
-            public override void Render()
-            {
-                drawOrder.Add(this);
-            }
-        }
-
-        [Test]
-        public void DrawOrder()
-        {
-            var worldBuilder = new WorldBuilder();
-            worldBuilder.RegisterDrawLayer(1);
-            worldBuilder.RegisterDrawLayer(2);
-            worldBuilder.RegisterDrawLayer(3);
-            worldBuilder.RegisterDrawLayer(4);
-            worldBuilder.RegisterDrawLayer(7);
-
-            worldBuilder.AddOrderedRenderer(new TestEntityRenderer());
-            var testGeneralRenderer = worldBuilder.AddGeneralRenderer(new TestGeneralRenderer(), 7);
-
-            TestComponent testComponent;
-            TestDrawComponent drawComponentThree = new TestDrawComponent { Layer = 3 };
-            var drawComponentTwo = new TestDrawComponent { Layer = 2 };
-            var drawComponentOne = new TestDrawComponent { Layer = 1 };
-            var drawComponentFour = new TestDrawComponent { Layer = 4 };
-
-            var entity = worldBuilder.CreateEntity();
-            worldBuilder.SetComponent(entity, testComponent);
-            worldBuilder.SetComponent(entity, drawComponentThree);
-
-            var entityTwo = worldBuilder.CreateEntity();
-            worldBuilder.SetComponent(entityTwo, testComponent);
-            worldBuilder.SetComponent(entityTwo, drawComponentTwo);
-
-            var entityThree = worldBuilder.CreateEntity();
-            worldBuilder.SetComponent(entityThree, testComponent);
-            worldBuilder.SetComponent(entityThree, drawComponentThree);
-
-            var entityFour = worldBuilder.CreateEntity();
-            worldBuilder.SetComponent(entityFour, testComponent);
-            worldBuilder.SetComponent(entityFour, drawComponentFour);
-
-            var world = worldBuilder.Build();
-
-            world.Update(0.01f);
-            world.Draw();
-
-            drawOrder.Should().BeEquivalentTo(entityFour, entityTwo, entity, entityThree, testGeneralRenderer);
-        }
-    }
-}
--- a/test/test.csproj
+++ b/test/test.csproj
@ -1,11 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
-    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <TargetFramework>net5.0</TargetFramework>
    <IsPackable>false</IsPackable>
    <RootNamespace>Tests</RootNamespace>
    <AssemblyName>EncompassECS.Framework.Tests</AssemblyName>
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <Platforms>x64;x86</Platforms>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="FluentAssertions" Version="5.7.0" />
Author	SHA1	Message	Date
cosmonaut	00614661ec	fix broken test continuous-integration/drone/push Build is passing Details	2021-03-23 17:50:05 -07:00
cosmonaut	36e98b0376	add dt and alpha params to renderers continuous-integration/drone/push Build is failing Details	2021-03-23 17:37:47 -07:00
cosmonaut	6858ec1b0f	Mega Refactor (#20 ) continuous-integration/drone/push Build is passing Details Co-Authored-By: cosmonaut <evan@moonside.games> Co-Committed-By: cosmonaut <evan@moonside.games>	2021-03-12 08:25:25 +00:00
cosmonaut	df0e251650	Merge pull request 'fix configuration' (#19 ) from fix_sln into main continuous-integration/drone/push Build is passing Details Reviewed-on: #19	2021-01-30 01:09:35 +00:00
cosmonaut	5183c04632	fix configuration continuous-integration/drone/push Build is passing Details continuous-integration/drone/pr Build is passing Details	2021-01-29 17:04:13 -08:00
cosmonaut	d5186e6011	remove some dependencies (#18 ) continuous-integration/drone/push Build is passing Details Co-Authored-By: cosmonaut <evan@moonside.games> Co-Committed-By: cosmonaut <evan@moonside.games>	2021-01-30 00:36:42 +00:00
cosmonaut	49ea9e7a5d	0.23.0 (#16 ) continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2020-11-16 07:24:37 +00:00
cosmonaut	40e6d75638	Expose some enumerable iterators + some tweaks (#15 ) continuous-integration/drone/push Build is passing Details	2020-11-16 07:21:51 +00:00
cosmonaut	327a458f17	Update 'encompass-cs/encompass-cs.csproj' continuous-integration/drone/pr Build is passing Details continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2020-07-22 01:10:45 +00:00
Evan Hemsley	d661ed5b17	Spawner.Spawn now requires in param continuous-integration/drone/pr Build is passing Details continuous-integration/drone/push Build is passing Details	2020-07-21 18:05:47 -07:00
cosmonaut	1d458e3563	0.21.3 continuous-integration/drone/pr Build is passing Details continuous-integration/drone/push Build is passing Details continuous-integration/drone/tag Build is passing Details	2020-07-20 03:18:12 +00:00
cosmonaut	b4a5a4c66a	Merge pull request 'fix silent failure when performing singular reads' (#11 ) from SingularReadFix into main continuous-integration/drone/push Build is passing Details Reviewed-on: #11	2020-07-20 03:12:45 +00:00
Evan Hemsley	a5fd322791	fix silent failure when performing singular reads continuous-integration/drone/push Build is passing Details continuous-integration/drone/pr Build is passing Details	2020-07-19 20:10:38 -07:00
cosmonaut	94e81a0258	0.21.2 continuous-integration/drone/tag Build is passing Details continuous-integration/drone/push Build is passing Details	2020-07-16 07:15:08 +00:00
Evan Hemsley	b234b9bad1	0.21.2 continuous-integration/drone/push Build is passing Details continuous-integration/drone/pr Build is passing Details	2020-07-16 00:12:31 -07:00
cosmonaut	703e088430	fix IDrawableComponent throwing if non auto property used for Layer (#9 ) continuous-integration/drone/push Build is passing Details	2020-07-16 07:10:21 +00:00
cosmonaut	59014c7a9e	QueryWith and QueryWithout implicitly Read (#8 ) continuous-integration/drone/push Build is passing Details	2020-07-12 22:17:38 +00:00
cosmonaut	e76161c8af	license (#7 ) continuous-integration/drone/push Build is passing Details	2020-07-10 19:49:17 +00:00