-IDManager

-times counting for tests

source/ecs/entity.d

@@ -5,12 +5,17 @@ import ecs.manager;
 struct EntityID
 {
     uint id;
-    uint id_count;
+    uint counter;
 }
 
 struct Entity
 {
     EntityID id;
+
+    void updateID()
+    {
+        EntityManager.instance.id_manager.update(this);
+    }
 }
 
 struct EntityTemplate

source/ecs/id_manager.d

@@ -0,0 +1,65 @@
+module ecs.id_manager;
+
+import ecs.entity;
+import ecs.vector;
+
+struct IDManager
+{
+    EntityID getNewID()
+    {
+        while(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;
+        return id;
+    }
+
+    void releaseID(EntityID id)
+    {
+        Data* data = &m_ids_array[id.id];
+        if(data.counter != id.counter)return;
+        data.next_id = m_next_id;
+        data.entity = null;
+        m_next_id = id.id;
+    }
+
+    void update(ref Entity entity)
+    {
+        m_ids_array[entity.id.id].entity = &entity;
+    }
+
+    struct Data
+    {
+        uint counter = 0;
+        uint next_id = uint.max;
+        Entity* entity = null;
+    }
+
+    private uint m_next_id = 0;
+    Vector!Data m_ids_array;
+}
+
+unittest
+{
+    IDManager manager;
+    EntityID id1 = manager.getNewID();
+    EntityID id2 = manager.getNewID();
+    EntityID id3 = manager.getNewID();
+
+    assert(id1 == EntityID(0,1));
+    assert(id2 == EntityID(1,1));
+    assert(id3 == EntityID(2,1));
+
+    manager.releaseID(id2);
+    manager.releaseID(id1);
+
+    id2 = manager.getNewID();
+    id1 = manager.getNewID();
+
+    assert(id1 == EntityID(1,2));
+    assert(id2 == EntityID(0,2));
+    assert(id3 == EntityID(2,1));
+
+}

source/ecs/manager.d

@@ -12,6 +12,7 @@ import ecs.system;
 import ecs.entity;
 import ecs.vector;
 import ecs.hash_map;
+import ecs.id_manager;
 
 alias gEM = EntityManager.instance;
 
@@ -23,6 +24,12 @@ class EntityManager
         instance = Mallocator.instance.make!EntityManager;
     }
 
+    static void destory()
+    {
+        Mallocator.instance.dispose(instance);
+        instance = null;
+    }
+
     void registerSystem(Sys)(int priority)
     {
         alias types = Parameters!(Sys.update);
@@ -197,7 +204,7 @@ class EntityManager
         {
             if (block is null)
             {
-                block = cast(EntitiesBlock*) AlignedMallocator.instance.alignedAllocate(4096, 4096);
+                block = cast(EntitiesBlock*) AlignedMallocator.instance.alignedAllocate(page_size, page_size);
                 *block = EntitiesBlock(tmpl.info);
                 if (previous_block is null)
                 {
@@ -211,7 +218,7 @@ class EntityManager
                 break; // new block certainly has free space
             }
             // check if there is enought space
-            if (block.dataDelta() + (block.entities_count + 1) * tmpl.info.size > 4096)
+            if (block.dataDelta() + (block.entities_count + 1) * tmpl.info.size > page_size)
             {
                 previous_block = block;
                 block = block.next_block;
@@ -224,6 +231,9 @@ class EntityManager
 
         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();
         block.entities_count++;
     }
 
@@ -273,8 +283,13 @@ class EntityManager
         ///there is a loooot of data (4kB, pure magic)
     }
 
+    enum page_size = 4096;
+    enum pages_in_block = 128;
+
     alias SytemFuncType = void function(ref EntityManager.CallData data, void* entity);
 
+    IDManager id_manager;
+
     HashMap!(ushort[], EntityInfo*) entities_infos;
     HashMap!(string, uint) components_map;
     System[] systems;