105 lines
3.1 KiB
D
105 lines
3.1 KiB
D
module ecs.id_manager;
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import ecs.entity;
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import ecs.vector;
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/************************************************************************************************************************
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*IDManager is responsible for assignment and removing IDs. IDs are unique throughtout a whole duration of the program.
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*/
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struct IDManager
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{
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/************************************************************************************************************************
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*Get new ID.
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*/
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EntityID getNewID()
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{
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if (m_next_id >= m_ids_array.length)
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m_ids_array.add(Data());
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EntityID id;
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id.id = m_next_id;
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id.counter = /*++*/m_ids_array[m_next_id].counter;
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m_next_id = m_ids_array[m_next_id].next_id;
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if (m_next_id == uint.max)
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m_next_id = cast(uint) m_ids_array.length;
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return id;
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}
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/************************************************************************************************************************
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*Release ID.
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*/
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void releaseID(EntityID id)
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{
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Data* data = &m_ids_array[id.id];
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if (data.counter != id.counter)
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return;
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data.counter++;
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data.next_id = m_next_id;
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data.entity = null;
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m_next_id = id.id;
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}
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/************************************************************************************************************************
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*Update pointer to entity. The purpose of this function is to ensure that pointer to entity is always correct.
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*/
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void update(ref Entity entity)
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{
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if(entity.id.counter == m_ids_array[entity.id.id].counter)m_ids_array[entity.id.id].entity = &entity;
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}
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/************************************************************************************************************************
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*Returns pointer to entity.
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*/
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export Entity* getEntityPointer(EntityID id)
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{
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Data* data = &m_ids_array[id.id];
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if (data.counter != id.counter)
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return null;
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else
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return data.entity;
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}
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/************************************************************************************************************************
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*Check if entity with specified ID exist.
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*/
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export bool isExist(EntityID id)
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{
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Data* data = &m_ids_array[id.id];
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return data.counter == id.counter;
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}
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private static struct Data
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{
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uint counter = 0;
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uint next_id = uint.max;
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Entity* entity = null;
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}
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private:
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uint m_next_id;
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Vector!Data m_ids_array;
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}
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unittest
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{
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IDManager manager;
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EntityID id1 = manager.getNewID();
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EntityID id2 = manager.getNewID();
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EntityID id3 = manager.getNewID();
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assert(id1 == EntityID(0, 1));
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assert(id2 == EntityID(1, 1));
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assert(id3 == EntityID(2, 1));
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manager.releaseID(id2);
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manager.releaseID(id1);
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id2 = manager.getNewID();
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id1 = manager.getNewID();
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assert(id1 == EntityID(1, 2));
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assert(id2 == EntityID(0, 2));
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assert(id3 == EntityID(2, 1));
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assert(manager.isExist(id3));
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assert(!manager.isExist(EntityID(0, 1)));
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}
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