-formatted all files with dfmt

-more messy tests
-some documentation
-some useful code moved to functions
-adding components to existing entity
-opportunity to get entity by ID
-fixed calculating deltas
-sorting IDs arrays for allocating Templates
-fixed alignment caluclation
-added compile-time checks for "component_id" member existing in component

source/ecs/id_manager.d

@@ -7,19 +7,22 @@ struct IDManager
 {
     EntityID getNewID()
     {
-        if(m_next_id >= m_ids_array.length)m_ids_array.add(Data());
+        if (m_next_id >= m_ids_array.length)
+            m_ids_array.add(Data());
         EntityID id;
         id.id = m_next_id;
         id.counter = ++m_ids_array[m_next_id].counter;
         m_next_id = m_ids_array[m_next_id].next_id;
-        if(m_next_id == uint.max)m_next_id = cast(uint)m_ids_array.length;
+        if (m_next_id == uint.max)
+            m_next_id = cast(uint) m_ids_array.length;
         return id;
     }
 
     void releaseID(EntityID id)
     {
         Data* data = &m_ids_array[id.id];
-        if(data.counter != id.counter)return;
+        if (data.counter != id.counter)
+            return;
         data.next_id = m_next_id;
         data.entity = null;
         m_next_id = id.id;
@@ -33,8 +36,10 @@ struct IDManager
     Entity* getEntityPointer(EntityID id)
     {
         Data* data = &m_ids_array[id.id];
-        if(data.counter != id.counter)return null;
+        if (data.counter != id.counter)
-        else return data.entity;
+            return null;
+        else
+            return data.entity;
     }
 
     bool isExist(EntityID id)
@@ -61,9 +66,9 @@ unittest
     EntityID id2 = manager.getNewID();
     EntityID id3 = manager.getNewID();
 
-    assert(id1 == EntityID(0,1));
+    assert(id1 == EntityID(0, 1));
-    assert(id2 == EntityID(1,1));
+    assert(id2 == EntityID(1, 1));
-    assert(id3 == EntityID(2,1));
+    assert(id3 == EntityID(2, 1));
 
     manager.releaseID(id2);
     manager.releaseID(id1);
@@ -71,10 +76,10 @@ unittest
     id2 = manager.getNewID();
     id1 = manager.getNewID();
 
-    assert(id1 == EntityID(1,2));
+    assert(id1 == EntityID(1, 2));
-    assert(id2 == EntityID(0,2));
+    assert(id2 == EntityID(0, 2));
-    assert(id3 == EntityID(2,1));
+    assert(id3 == EntityID(2, 1));
     assert(manager.isExist(id3));
-    assert(!manager.isExist(EntityID(0,1)));
+    assert(!manager.isExist(EntityID(0, 1)));
 
 }

source/ecs/manager.d

@@ -39,11 +39,11 @@ class EntityManager
 
         static string genCall()()
         {
-            string ret = "s.update(";
+            string ret = "s.update(*cast(Entity*)data_pointer,";
-            foreach (i, param; Parameters!(Sys.update))
+            foreach (i; 1 .. (Parameters!(Sys.update)).length)
             {
-                ret ~= "*cast(types[" ~ i.to!string
+                ret ~= "*cast(types[" ~ i.to!string ~ "]*)(data_pointer + data.deltas[" ~ (i - 1)
-                    ~ "]*)(data_pointer + data.deltas[" ~ i.to!string ~ "]),";
+                    .to!string ~ "]),";
             }
             ret ~= ");";
             return ret;
@@ -52,10 +52,10 @@ class EntityManager
         static string genCompList()()
         {
             string ret;
-            foreach (i, param; Parameters!(Sys.update))
+            foreach (i; 1 .. (Parameters!(Sys.update)).length)
             {
-                ret ~= "system.m_components[" ~ i.to!string
+                ret ~= "system.m_components[" ~ (i - 1)
-                    ~ "] = components_map.get(types[" ~ i.to!string ~ "].stringof);\n";
+                    .to!string ~ "] = components_map.get(types[" ~ i.to!string ~ "].stringof);\n";
             }
             return ret;
         }
@@ -112,7 +112,7 @@ class EntityManager
 
         system.m_system_pointer = cast(void*) Mallocator.instance.make!Sys;
 
-        system.m_components = Mallocator.instance.makeArray!uint(types.length);
+        system.m_components = Mallocator.instance.makeArray!uint(types.length - 1);
         mixin(genCompList());
 
         systems.add(system);
@@ -126,12 +126,18 @@ class EntityManager
 
     void registerComponent(Comp)()
     {
+        static if (!(hasMember!(Comp, "component_id")) || !is(typeof(Comp.component_id) == ushort))
+        {
+            static assert(0, "Component should have \"__gshared ushort component_id");
+        }
+
         ushort size = Comp.sizeof;
         ComponentInfo info;
         info.size = size;
         info.aligment = Comp.alignof; //8;
 
         components.add(info);
+        Comp.component_id = cast(ushort)(components.length - 1);
         components_map.add(Comp.stringof, cast(uint)(components.length - 1));
     }
 
@@ -149,27 +155,68 @@ class EntityManager
 
     static void alignNum(ref ushort num, ushort aligment)
     {
-        num += aligment - (num & (aligment - 1));
+        num = cast(ushort)((num + aligment - 1) & (-cast(int) aligment)); //num += aligment - (num & (aligment - 1));
     }
 
     EntityTemplate* allocateTemplate(ushort[] components_ids)
     {
-        EntityInfo* info = entities_infos.get(components_ids, null);
+        extern (C) static int compareUShorts(const void* a, const void* b)
+        {
+            ushort _a = *cast(ushort*) a;
+            ushort _b = *cast(ushort*) b;
+            if (_a < _b)
+                return -1;
+            else if (_a == _b)
+                return 0;
+            else
+                return 1;
+        }
+
+        ushort[] ids = (cast(ushort*) alloca(ushort.sizeof * components_ids.length))[0
+            .. components_ids.length];
+        ids[0 .. $] = components_ids[];
+        qsort(ids.ptr, ids.length, ushort.sizeof, &compareUShorts);
+        {
+            uint j = 1;
+            foreach (i; 1 .. ids.length)
+            {
+                if (ids[i] != ids[j - 1])
+                {
+                    ids[j] = ids[i];
+                    j++;
+                }
+                else
+                    debug assert(0, "Duplicated components in template!!!");
+            }
+            ids = ids[0 .. j];
+        }
+
+        EntityInfo* info = getEntityInfo(ids);
+
+        EntityTemplate* temp = Mallocator.instance.make!EntityTemplate;
+        temp.entity_data = Mallocator.instance.makeArray!ubyte(info.size);
+        temp.info = info;
+        return temp;
+    }
+
+    EntityInfo* getEntityInfo(ushort[] ids)
+    {
+        EntityInfo* info = entities_infos.get(ids, null);
         if (info is null)
         {
             info = Mallocator.instance.make!EntityInfo;
 
-            info.components = Mallocator.instance.makeArray(components_ids);
+            info.components = Mallocator.instance.makeArray(ids);
-            info.deltas = Mallocator.instance.makeArray!ushort(components_ids.length);
+            info.deltas = Mallocator.instance.makeArray!ushort(ids[$ - 1] + 1);
 
             info.size = EntityID.sizeof;
             info.alignment = EntityID.alignof;
 
-            foreach (i, id; components_ids)
+            foreach (i, id; ids)
             {
                 info.alignment = max(info.alignment, components[id].aligment);
                 alignNum(info.size, components[id].aligment);
-                info.deltas[i] = info.size;
+                info.deltas[id] = info.size;
                 info.size += components[id].size;
             }
             alignNum(info.size, info.alignment);
@@ -183,11 +230,7 @@ class EntityManager
 
             entities_infos.add(info.components, info);
         }
-
+        return info;
-        EntityTemplate* temp = Mallocator.instance.make!EntityTemplate;
-        temp.entity_data = Mallocator.instance.makeArray!ubyte(info.size);
-        temp.info = info;
-        return temp;
     }
 
     void addEntityCaller(ref EntityInfo entity, ref System system)
@@ -202,7 +245,7 @@ class EntityManager
             {
                 if (id2 == id)
                 {
-                    deltas[i] = entity.deltas[i2];
+                    deltas[i] = entity.deltas[id2];
                     break;
                 }
             }
@@ -215,10 +258,110 @@ class EntityManager
         if (deltas)
         {
             call_data.deltas = Mallocator.instance.makeArray(deltas); //Mallocator.instance.makeArray!ushort(system.m_components.length);
+
             entity.callers.add(call_data);
         }
     }
 
+    Entity* getEntity(EntityID id)
+    {
+        return cast(Entity*) id_manager.getEntityPointer(id);
+    }
+
+    void addComponents(Components...)(EntityID entity_id, Components comps)
+    {
+        const uint num = Components.length;
+        Entity* entity = id_manager.getEntityPointer(entity_id);
+        EntitiesBlock* block = getMetaData(entity);
+        EntityInfo* info = block.type_data;
+        ushort[] ids = (cast(ushort*) alloca(ushort.sizeof * (info.components.length + num)))[0
+            .. info.components.length + num];
+        ushort[num] new_ids;
+
+        static foreach (i, comp; Components)
+        {
+            new_ids[i] = comp.component_id;
+        }
+
+        void*[num] pointers;
+
+        static foreach (i, comp; comps)
+        {
+            pointers[i] = &comp;
+        }
+
+        uint j = 0;
+        uint k = 0;
+        foreach (ref id; ids)
+        {
+            if (k >= new_ids.length)
+            {
+                id = info.components[j++];
+                continue;
+            }
+            if (j >= info.components.length)
+            {
+                id = new_ids[k++];
+                continue;
+            }
+            debug if (new_ids[k] == info.components[j])
+                assert(0, "Trying to add already existing component!");
+            if (new_ids[k] < info.components[j])
+            {
+                id = new_ids[k++];
+            }
+            else
+                id = info.components[j++];
+        }
+
+        EntityInfo* new_info = getEntityInfo(ids);
+
+        EntitiesBlock* new_block = findBlockWithFreeSpace(new_info);
+
+        void* start = new_block.dataBegin() + new_block.entities_count * new_info.size;
+
+        Entity* new_entity = cast(Entity*) start;
+        new_entity.id = entity.id;
+        new_entity.updateID();
+        new_block.entities_count++;
+
+        //removeEntityNoID(entity, block);
+
+        j = 0;
+        k = 0;
+        foreach (ref id; ids)
+        {
+            if (k >= new_ids.length)
+            {
+                memcpy(cast(void*) new_entity + new_info.deltas[id],
+                        cast(void*) entity + info.deltas[info.components[j]],
+                        components[info.components[j]].size); //id = info.components[j++];
+                j++;
+            }
+            else if (j >= info.components.length)
+            {
+                memcpy(cast(void*) new_entity + new_info.deltas[id],
+                        pointers[k], components[new_ids[k]].size); //id = new_ids[k++];
+                k++;
+            }
+            else if (id == new_ids[k])
+            {
+                memcpy(cast(void*) new_entity + new_info.deltas[id],
+                        pointers[k], components[new_ids[k]].size); //id = new_ids[k++];
+                k++;
+            }
+            else
+            {
+                memcpy(cast(void*) new_entity + new_info.deltas[id],
+                        cast(void*) entity + info.deltas[info.components[j]],
+                        components[info.components[j]].size); //id = info.components[j++];
+                j++;
+            }
+        }
+
+        removeEntityNoID(entity, block);
+    }
+
     void freeTemplate(EntityTemplate* template_)
     {
         Mallocator.instance.dispose(template_.entity_data);
@@ -227,44 +370,11 @@ class EntityManager
 
     ref Entity addEntity(EntityTemplate* tmpl)
     {
-        EntitiesBlock* previous_block;
+        EntitiesBlock* block = findBlockWithFreeSpace(tmpl.info);
-        EntitiesBlock* block = tmpl.info.first_with_free_space; //tmpl.info.first_block;
-
-        // find block with enought space
-        while (1)
-        {
-            if (block is null)
-            {
-                block = cast(EntitiesBlock*) AlignedMallocator.instance.alignedAllocate(page_size,
-                        page_size);
-                *block = EntitiesBlock(tmpl.info);
-                if (previous_block is null)
-                {
-                    tmpl.info.first_block = block;
-                    block.id = 0;
-                }
-                else
-                {
-                    previous_block.next_block = block;
-                    block.id = previous_block.id + 1;
-                }
-                tmpl.info.first_with_free_space = block;
-                break; // new block certainly has free space
-            }
-            // check if there is enought space
-            if (block.dataDelta() + (block.entities_count + 1) * tmpl.info.size > page_size)
-            {
-                previous_block = block;
-                block = block.next_block;
-                continue;
-            }
-
-            tmpl.info.first_with_free_space = block;
-            break; // block exists and bounds check passed
-        }
 
         void* start = block.dataBegin() + block.entities_count * tmpl.info.size;
         memcpy(start, tmpl.entity_data.ptr, tmpl.info.size);
+
         Entity* entity = cast(Entity*) start;
         entity.id = id_manager.getNewID();
         entity.updateID();
@@ -272,31 +382,90 @@ class EntityManager
         return *entity;
     }
 
+    EntitiesBlock* findBlockWithFreeSpace(EntityInfo* info)
+    {
+        EntitiesBlock* previous_block;
+        EntitiesBlock* block = info.first_with_free_space;
+
+        while (1)
+        {
+            if (block is null)
+            {
+                block = cast(EntitiesBlock*) AlignedMallocator.instance.alignedAllocate(page_size,
+                        page_size);
+                *block = EntitiesBlock(info);
+                if (previous_block is null)
+                {
+                    info.first_block = block;
+                    block.id = 0;
+                }
+                else
+                {
+                    previous_block.next_block = block;
+                    block.id = previous_block.id + 1;
+                }
+                info.first_with_free_space = block;
+                break; // new block certainly has free space
+            }
+            // check if there is enought space
+            if (block.dataDelta() + (block.entities_count + 1) * info.size > page_size)
+            {
+                previous_block = block;
+                block = block.next_block;
+                continue;
+            }
+
+            info.first_with_free_space = block;
+            break; // block exists and bounds check passed
+        }
+
+        return block;
+    }
+
     void removeEntity(EntityID id)
     {
+        //get entity and block meta data pointers
         Entity* entity = id_manager.getEntityPointer(id);
-        if(entity is null)return;
+        if (entity is null)
+            return; //return if entity doesn't exist
         EntitiesBlock* block = getMetaData(entity);
-        id_manager.releaseID(id);
+        id_manager.releaseID(id); //release id from manager
 
+        removeEntityNoID(entity, block);
+    }
+
+    private void removeEntityNoID(Entity* entity, EntitiesBlock* block)
+    {
+        //pos is Entity number in block
         void* data_begin = block.dataBegin();
-        uint pos = cast(int)(cast(void*)entity - data_begin) / block.type_data.size;
+        uint pos = cast(int)(cast(void*) entity - data_begin) / block.type_data.size;
 
         block.entities_count--;
 
-        if(block.type_data.first_with_free_space.id > block.id)block.type_data.first_with_free_space = block;
+        //set "first_with_free_space" if should it be
+        if (block.type_data.first_with_free_space.id > block.id)
+            block.type_data.first_with_free_space = block;
 
-        if(pos == block.entities_count)return;
+        if (pos == block.entities_count)
+            return;
 
+        //copy memory of last entity to position of removed entity
         void* src = data_begin + block.entities_count * block.type_data.size;
         void* dst = data_begin + pos * block.type_data.size;
 
-        memcpy(dst,src,block.type_data.size);
+        memcpy(dst, src, block.type_data.size);
 
+        //update pointer for moved entity ID
         entity = cast(Entity*) dst;
         entity.updateID();
     }
 
+    /************************************************************************************************************************
+    *functions return MetaData of page.
+    *
+    *params:
+    *pointer = pointer to any data of entity (i.e. component data pointer)
+    */
     EntitiesBlock* getMetaData(void* pointer)
     {
         return cast(EntitiesBlock*)(cast(size_t) pointer & (~cast(size_t)(page_size - 1)));
@@ -308,19 +477,33 @@ class EntityManager
         ushort aligment;
     }
 
+    /************************************************************************************************************************
+    *Entity type info.
+    */
     struct EntityInfo
     {
+        ///entity components
         ushort[] components;
+        ///deltas in memory for components
         ushort[] deltas;
+        ///aligment of whole entity
         ushort alignment;
+        ///size of entity (with alignment respect)
         ushort size;
+        ///pointer to first block/page
         EntitiesBlock* first_block;
+        ///a hint for allocations
         EntitiesBlock* first_with_free_space; // a hint for allocations,  should have empty space in it but doesn't have to
+        ///array of CallData. Contain data for System calls.
         Vector!(CallData) callers;
     }
 
+    /************************************************************************************************************************
+    *Meta data of every block of entities (contained at the begining of block).
+    */
     struct EntitiesBlock
     {
+        ///return distance (in bytes) from begin of block to data
         uint dataDelta()
         {
             ushort dif = EntitiesBlock.sizeof;
@@ -328,6 +511,7 @@ class EntityManager
             return dif;
         }
 
+        ///return pointer to first element in block
         void* dataBegin()
         {
             ushort dif = EntitiesBlock.sizeof;
@@ -335,17 +519,27 @@ class EntityManager
             return cast(void*)&this + dif;
         }
 
+        ///pointer to Entity type info
         EntityInfo* type_data;
+        ///number of entities in block
         uint entities_count;
+        ///block id
         uint id;
+        ///pointer to next block/page
         EntitiesBlock* next_block;
-        ///there is a loooot of data (4kB, pure magic)
+        //there is a loooot of data (4kB, pure magic)
     }
 
+    /************************************************************************************************************************
+    *Structure with data used to calling System calls.
+    */
     struct CallData
     {
+        ///pointer to used system
         System* system;
+        ///poiner to Entity type info
         EntityManager.EntityInfo* info;
+        ///deltas for components
         ushort[] deltas;
     }
 
@@ -365,3 +559,12 @@ class EntityManager
     __gshared EntityManager instance;
 
 }
+/*
+static ulong defaultHashFunc(T)(auto ref T t) 
+{
+    ulong ret = 0;
+    foreach(id;t)
+    {
+        ret = ret
+    }
+}*/

source/ecs/system.d

@@ -12,13 +12,15 @@ struct System
 
     void enable()
     {
-        if(!m_enabled && m_enable)m_enable(m_system_pointer);
+        if (!m_enabled && m_enable)
+            m_enable(m_system_pointer);
         m_enabled = true;
     }
 
     void disable()
     {
-        if(m_enabled && m_disable)m_disable(m_system_pointer);
+        if (m_enabled && m_disable)
+            m_disable(m_system_pointer);
         m_enabled = false;
     }
 

tests/tests.d

@@ -14,7 +14,7 @@ int main()
 
 	struct TestComp
 	{
-		__gshared static int component_id;
+		__gshared ushort component_id;
 		int a;
 		ulong b;
 
@@ -31,9 +31,43 @@ int main()
 
 	struct TestComp2
 	{
-		__gshared static int component_id;
+		__gshared ushort component_id;
-		short b;
+		int b;
-		ubyte a;
+		int a;
+
+		static void serializeComponent(ref TestComp comp, SerializeVector output)
+		{
+
+		}
+
+		static void deserializeComponent(ref TestComp comp, ubyte[] data)
+		{
+
+		}
+	}
+
+	struct TestComp3
+	{
+		__gshared ushort component_id;
+		uint gg; //good game
+		uint bg; //bad game
+
+		static void serializeComponent(ref TestComp comp, SerializeVector output)
+		{
+
+		}
+
+		static void deserializeComponent(ref TestComp comp, ubyte[] data)
+		{
+
+		}
+	}
+
+	struct TestComp4
+	{
+		__gshared ushort component_id;
+		uint gg; //good game
+		uint bg; //bad game
 
 		static void serializeComponent(ref TestComp comp, SerializeVector output)
 		{
@@ -49,22 +83,23 @@ int main()
 	struct TestSystem
 	{
 
-        void initialize(ref TestComp comp)
+		void initialize(ref Entity entity, ref TestComp comp)
 		{
 
 		}
 
-		void update(ref TestComp test, ref TestComp2 test2)//ref TestComp comp)
+		void update(ref Entity entity, ref TestComp test, ref TestComp2 test2) //ref TestComp comp)
 		{
-			assert( cast(ptrdiff_t)&test % TestComp.alignof == 0 );
+			assert(cast(size_t)&test % TestComp.alignof == 0);
-			assert( cast(ptrdiff_t)&test2 % TestComp2.alignof == 0 );
+			assert(cast(size_t)&test2 % TestComp2.alignof == 0);
 			import std.stdio;
+
 			//writeln("Jakis tekst! ",test.b);
-			test.a+=1000;
+			test.a += 1000;
-			test.b+=2000;
+			test.b += 2000;
 			//writeln("Jakis tekst! ",test.b);
 			test2.b += 2;
-			test2.a = 1;
+			test2.a = 8;
 			//writeln("Jakis tekst! ",test2.b);
 		}
 
@@ -80,23 +115,26 @@ int main()
 		void onEnable()
 		{
 			import std.stdio;
+
 			writeln("TestSystem2 enabled");
 		}
 
 		void onDisable()
 		{
 			import std.stdio;
+
 			writeln("TestSystem2 disabled");
 		}
 
-        void initialize(ref TestComp comp)
+		void initialize(ref Entity entity, ref TestComp comp)
 		{
 
 		}
 
-		void update(ref TestComp2 test2)//ref TestComp comp)
+		void update(ref Entity entity, ref TestComp3 test) //ref TestComp comp)
 		{
-			test2.b += 1000;
+			writeln("TestSystem2 update");
+			test.gg += 14;
 		}
 
 		void handleEvent(Event event, ref TestComp comp)
@@ -111,10 +149,12 @@ int main()
 	MonoTime time = MonoTime.currTime;
 
 	gEM.registerComponent!TestComp2;
+	gEM.registerComponent!TestComp4;
 	gEM.registerComponent!TestComp;
+	gEM.registerComponent!TestComp3;
 
 	ulong dur = (MonoTime.currTime - time).total!"usecs";
-	writeln("Components register: ",dur," usecs");
+	writeln("Components register: ", dur, " usecs");
 
 	time = MonoTime.currTime;
 
@@ -122,16 +162,17 @@ int main()
 	//gEM.registerSystem!TestSystem2(0);
 
 	dur = (MonoTime.currTime - time).total!"usecs";
-	writeln("Systems register: ",dur," usecs");
+	writeln("Systems register: ", dur, " usecs");
 
 	time = MonoTime.currTime;
 
-    ushort[2] ids = [0,1];
+	ushort[2] ids = [TestComp2.component_id, TestComp.component_id];
 	EntityTemplate* tmpl = gEM.allocateTemplate(ids);
-	*cast(EntityID*)tmpl.entity_data.ptr = EntityID(1,1);
+	//writeln(tmpl.info.components[]);
+	*cast(EntityID*) tmpl.entity_data.ptr = EntityID(1, 1);
 
 	dur = (MonoTime.currTime - time).total!"usecs";
-	writeln("Template allocating: ",dur," usecs");
+	writeln("Template allocating: ", dur, " usecs");
 
 	time = MonoTime.currTime;
 
@@ -141,30 +182,34 @@ int main()
 
 	EntityID[1000] idss;
 
-	foreach(i; 0..1_000)
+	foreach (i; 0 .. 1_000)
 	{
-		foreach(j; 0..1_000)idss[j] = gEM.addEntity(tmpl).id;
+		foreach (j; 0 .. 1_000)
-		foreach(j; 0..1_000)gEM.removeEntity(idss[j]);
+			idss[j] = gEM.addEntity(tmpl).id;
+		foreach (j; 0 .. 1_000)
+			gEM.removeEntity(idss[j]);
 	}
 
 	uint blocks = 0;
-	foreach(info; &gEM.entities_infos.byValue)
+	foreach (info; &gEM.entities_infos.byValue)
 	{
 		EntityManager.EntitiesBlock* block = info.first_block;
-		while(block !is null)
+		while (block !is null)
 		{
 			block = block.next_block;
 			blocks++;
 		}
 	}
-	writeln("Entities blocks: ",blocks);
+	writeln("Entities blocks: ", blocks);
 
 	/*Entity entity = gEM.addEntity(tmpl);
 	gEM.removeEntity(entity.id);
 	gEM.addEntity(tmpl);*/
 
 	dur = (MonoTime.currTime - time).total!"usecs";
-	writeln("Entities adding: ",dur," usecs");
+	writeln("Entities adding: ", dur, " usecs");
+
+	//foreach(j; 0..1_000)gEM.addEntity(tmpl);
 
 	gEM.registerSystem!TestSystem2(0);
 
@@ -173,10 +218,26 @@ int main()
 
 	time = MonoTime.currTime;
 
-    gEM.update();
+	//gEM.update();
 
 	dur = (MonoTime.currTime - time).total!"usecs";
-	writeln("Update: ",dur," usecs");
+	writeln("Update: ", dur, " usecs");
+
+	Entity entity = gEM.addEntity(tmpl);
+
+	gEM.update();
+
+	Entity* pp = gEM.getEntity(entity.id);
+	writeln((cast(uint*) pp)[0 .. 14], " ", pp);
+
+	gEM.addEntity(tmpl);
+
+	gEM.addComponents(entity.id, TestComp3());
+	pp = gEM.getEntity(entity.id);
+
+	gEM.update();
+
+	writeln((cast(uint*) pp)[0 .. 14], " ", pp);
 
 	//import std.stdio;
 	//writeln((cast(uint*)tmpl.info.first_block)[0..48]);