conversion to c by gemini 4 argon

Game/Entity/EntityManager.c

@@ -0,0 +1,190 @@
+#include <Entity/EntityManager.h>
+
+#include <Core/Common/serialization.h>
+#include <Core/Memory/Utils.h>
+#include <Data/World.h>
+#include <Engine/user.h>
+#include <Entity/Entity.h>
+#include <Entity/entity_types.h>
+#include <game.h>
+#include <Graphics/MeshRenderer.h>
+
+EntityID g_entity_manager_id = 0;
+
+void InitEntityManager(World* world)
+{
+    Assert(world != NULL);
+
+    EntityManager* newManager   = ArenaPushStruct(world->WorldArena, EntityManager);
+    newManager->next_local_counter = 1ULL;
+    world->EntityManager        = newManager;
+
+    VectorArenaCreate(&newManager->Entities, Entity, world->WorldArena, 100000 JULIET_DEBUG_PARAM("Entities"));
+
+    ArenaParams by_type_params = { .ReserveSize = Kilobytes(1),
+                                   .CommitSize  = Kilobytes(1),
+                                   .Name        = "" JULIET_DEBUG_ONLY(, .DoNotReserveMore = true) };
+    for (uint8 i = 0; i < ENTITY(Count); ++i)
+    {
+        by_type_params.Name          = kEntity_type_names[i];
+        newManager->by_type[i].arena = ArenaAllocate(by_type_params);
+        newManager->by_type[i].array = NULL;
+        newManager->by_type[i].count = 0;
+    }
+}
+
+void ShutdownEntityManager(void)
+{
+    EntityManager* manager = GetEntityManager();
+    for (uint8 i = 0; i < ENTITY(Count); ++i)
+    {
+        ArenaRelease(manager->by_type[i].arena);
+    }
+
+    vector_arena_destroy(&manager->Entities);
+}
+
+EntityManager* GetEntityManager(void)
+{
+    EntityManager* entityManager = GetGameState()->World->EntityManager;
+    Assert(entityManager != NULL);
+    return entityManager;
+}
+
+EntityID generate_next_entity_id(EntityManager* manager)
+{
+    Assert(manager != NULL);
+
+    UserID user = get_local_user_id();
+    Assert(user != kInvalid_user_id);
+    Assert(manager->next_local_counter != kEntityID_user_id_mask);
+
+    EntityID new_id = make_entity_id(user, manager->next_local_counter);
+    manager->next_local_counter += 1ULL;
+    return new_id;
+}
+
+EntityTemplate* RegisterEntity(EntityManager* manager, Entity* base, DerivedType entity)
+{
+    Assert(manager != NULL);
+    Assert(base != NULL);
+
+    base->ID      = g_entity_manager_id++;
+    base->derived = entity;
+
+    VectorArenaPushPtr(Entity, &manager->Entities, base);
+
+    EntityTemplate* ptr = (EntityTemplate*)ArenaPushSize(
+        manager->by_type[base->derived_kind->kind].arena, base->derived_kind->size_of, base->derived_kind->alignment,
+        false JULIET_DEBUG_PARAM(kEntity_type_names[base->derived_kind->kind]));
+    MemCopy(ptr, entity, base->derived_kind->size_of);
+    manager->by_type[base->derived_kind->kind].count += 1;
+
+    ptr->base = VectorArenaBack(Entity, &manager->Entities);
+
+    if (manager->by_type[base->derived_kind->kind].array == NULL)
+    {
+        manager->by_type[base->derived_kind->kind].array = ptr;
+    }
+
+    return ptr;
+}
+
+Entity* allocate_entity(EntityManager* manager, const Class* derived_type_class)
+{
+    Assert(manager != NULL);
+    Assert(derived_type_class != NULL);
+    Assert(derived_type_class->kind < ENTITY(Count));
+    Assert(derived_type_class->size_of >= sizeof(EntityTemplate));
+    Assert(derived_type_class->alignment > 0);
+    Assert(derived_type_class->initialize_fct != NULL);
+
+    Entity base_template       = { 0 };
+    base_template.derived_kind = derived_type_class;
+    base_template.is_dirty     = true;
+
+    VectorArenaPushPtr(Entity, &manager->Entities, &base_template);
+    Entity* base_ptr = VectorArenaBack(Entity, &manager->Entities);
+    Assert(base_ptr != NULL);
+
+    typed_entity_array* typed_array = &manager->by_type[derived_type_class->kind];
+    Assert(typed_array->arena != NULL);
+
+    void* derived = ArenaPushSize(typed_array->arena, derived_type_class->size_of, derived_type_class->alignment,
+                                  false JULIET_DEBUG_PARAM(kEntity_type_names[derived_type_class->kind]));
+    Assert(derived != NULL);
+    derived_type_class->initialize_fct(derived);
+
+    EntityTemplate* derived_template = (EntityTemplate*)derived;
+
+    base_ptr->derived      = derived;
+    derived_template->base = base_ptr;
+
+    if (typed_array->array == NULL)
+    {
+        typed_array->array = derived_template;
+    }
+    typed_array->count += 1;
+
+    return base_ptr;
+}
+
+void UpdateEntityManager(EntityManager* manager)
+{
+    Assert(manager != NULL);
+
+    // Todo : inert by definition dont move, but this is for test
+    typed_entity_array* by_type = &manager->by_type[ENTITY(Inert)];
+    for (index_t i = 0; i < by_type->count; ++i)
+    {
+        Inert* inert = ((Inert*)by_type->array) + i;
+        if (inert->MeshInstance != indexMax)
+        {
+            Matrix transform =
+                MatrixTranslation(inert->base->position.x, inert->base->position.y, inert->base->position.z);
+            SetMeshInstanceTransform(inert->MeshInstance, &transform);
+        }
+    }
+}
+
+Entity* deserialize_entity(Archive* ar, EntityManager* manager)
+{
+    Assert(ar != NULL);
+    Assert(manager != NULL);
+    Assert(ar->loading);
+
+    String class_name = { 0 };
+    SERIALIZE_STR(ar, Class, &class_name);
+
+    const Class* class_ptr = find_class_by_name(class_name);
+    Assert(class_ptr != NULL);
+
+    Entity* entity_base = allocate_entity(manager, class_ptr);
+    Assert(entity_base != NULL);
+
+    serialize_entity(ar, entity_base);
+
+    if (entity_base->ID >= g_entity_manager_id)
+    {
+        g_entity_manager_id = entity_base->ID + 1;
+    }
+
+    entity_base->is_dirty = false;
+
+    return entity_base;
+}
+
+void update_local_counter(EntityManager* manager, EntityID entity_id)
+{
+    Assert(manager != NULL);
+
+    uint8 user_id = get_local_user_id();
+    if (get_user_id(entity_id) == user_id)
+    {
+        uint64 counter = get_local_counter(entity_id);
+        if (counter >= manager->next_local_counter)
+        {
+            manager->next_local_counter = counter + 1ULL;
+        }
+    }
+}