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entity_framework.c
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#include "entity_framework.h"
// entity_metadata
void new_entity_metadata(entity_metadata_t *metadata, entity_type_t type, entity_constructor_t constructor, entity_destructor_t destructor, entity_update_t update)
{
ENTITY_FRAMEWORK_CHECK(
if (constructor == NULL || destructor == NULL || update == NULL) {
abort();
}
);
metadata->type = type;
metadata->constructor = constructor;
metadata->destructor = destructor;
metadata->update = update;
metadata->set = 1;
}
bool new_entity_metadata_registry(entity_metadata_registry_t *registry, entity_size_t capacity)
{
ENTITY_FRAMEWORK_CHECK(if (capacity == 0) { return false; });
ENTITY_ALIGNED_VAR(entity_size_t, capacity_bytes);
capacity_bytes = capacity * sizeof(entity_metadata_t);
capacity_bytes = ENTITY_ALIGN(capacity_bytes);
registry->metadata = entity_aligned_calloc(capacity_bytes, 1);
ENTITY_FRAMEWORK_ALLOC_CHECK(if (registry->metadata == NULL) { return false; });
registry->count = 0;
registry->capacity = capacity;
return true;
}
// entity_metadata_registry
void delete_entity_metadata_registry(entity_metadata_registry_t *registry)
{
entity_aligned_free(registry->metadata);
entity_memset(registry, 0, sizeof(entity_metadata_registry_t));
}
bool add_entity_metadata_registry(entity_metadata_registry_t *registry, entity_metadata_t *metadata)
{
if (metadata->type >= registry->capacity) {
registry->capacity = metadata->type + 1;
ENTITY_ALIGNED_VAR(entity_size_t, new_capacity_bytes);
new_capacity_bytes = registry->capacity * sizeof(entity_metadata_t);
new_capacity_bytes = ENTITY_ALIGN(new_capacity_bytes);
registry->metadata = entity_aligned_recalloc(registry->metadata,
registry->capacity * sizeof(entity_metadata_t),
new_capacity_bytes);
ENTITY_FRAMEWORK_ALLOC_CHECK(if (new_metadata == NULL) {
entity_memset(registry, 0, sizeof(entity_metadata_registry_t));
return false;
});
}
if (registry->metadata[metadata->type].set)
return false;
registry->metadata[metadata->type] = *metadata;
++registry->count;
return true;
}
// entity
bool _internal_new_entity(entity_manager_t *entity_manager, entity_t *entity, entity_metadata_t *metadata, entity_id_t id, va_list args)
{
entity->metadata = metadata;
entity->id = id;
entity->prev = NULL;
entity->next = NULL;
entity->metadata->constructor(entity_manager, entity, args);
if (entity->instance == NULL) {
return false;
}
if (entity_manager->first == NULL) {
entity_manager->first = entity;
entity_manager->last = entity;
} else {
entity_manager->last->next = entity;
entity->prev = entity_manager->last;
entity_manager->last = entity;
}
return true;
}
void _internal_delete_entity(entity_manager_t *entity_manager, entity_t *entity)
{
if (entity->prev == NULL) {
entity_manager->first = entity->next;
} else {
entity->prev->next = entity->next;
}
if (entity->next == NULL) {
entity_manager->last = entity->prev;
} else {
entity->next->prev = entity->prev;
}
entity->metadata->destructor(entity_manager, entity);
entity_aligned_free(entity);
--entity_manager->entity_count;
}
// entity_manager
void new_entity_manager(entity_manager_t *entity_manager, entity_size_t capacity)
{
entity_manager->first = NULL;
entity_manager->last = NULL;
entity_manager->entity_count = 0;
new_entity_metadata_registry(&entity_manager->metadata_registry, capacity);
entity_manager->next_id = 0;
entity_manager->to_free = NULL;
}
void delete_entity_manager(entity_manager_t *entity_manager)
{
while (entity_manager->first != NULL)
_internal_delete_entity(entity_manager, entity_manager->first);
}
bool add_entity(entity_manager_t *entity_manager, entity_type_t type, ...)
{
if (type >= entity_manager->metadata_registry.capacity) {
return false;
}
ENTITY_ALIGNED_VAR(entity_metadata_t *, metadata);
metadata = entity_manager->metadata_registry.metadata + type;
if (!metadata->set) {
return false;
}
ENTITY_ALIGNED_VAR(entity_t *, entity);
entity = entity_aligned_calloc(sizeof(entity_t), 1);
ENTITY_FRAMEWORK_ALLOC_CHECK(if (entity == NULL) { return false; });
va_list args;
va_start(args, type);
bool success = _internal_new_entity(entity_manager, entity, metadata, entity_manager->next_id++, args);
if (!success) {
entity_manager->next_id--;
entity_aligned_free(entity);
}
va_end(args);
return success;
}
bool delete_entity(entity_manager_t *entity_manager, entity_t *entity)
{
entity_list_to_free_t *to_free = entity_aligned_calloc(sizeof(entity_list_to_free_t), 1);
ENTITY_FRAMEWORK_ALLOC_CHECK(if (to_free == NULL) { return false; });
if (entity_manager->to_free == NULL) {
entity_manager->to_free = to_free;
} else {
to_free->next = entity_manager->to_free;
}
to_free->to_free = entity;
return true;
}
void flush_entity_manager_delete_queue(entity_manager_t *entity_manager)
{
while (entity_manager->to_free != NULL) {
entity_list_to_free_t *to_free = entity_manager->to_free;
entity_t *entity = to_free->to_free;
entity_manager->to_free = to_free->next;
_internal_delete_entity(entity_manager, entity);
entity_aligned_free(to_free);
}
}
void update_entity_manager(entity_manager_t *entity_manager, float dt)
{
flush_entity_manager_delete_queue(entity_manager);
for (entity_t *entity = entity_manager->first; entity != NULL; entity = entity->next)
entity->metadata->update(entity_manager, entity, dt);
}
bool register_new_entity(entity_manager_t *entity_manager, entity_type_t type, entity_constructor_t constructor, entity_destructor_t destructor, entity_update_t update)
{
entity_metadata_t metadata;
metadata.type = type;
metadata.set = true;
metadata.constructor = constructor;
metadata.destructor = destructor;
metadata.update = update;
return add_entity_metadata_registry(&entity_manager->metadata_registry, &metadata);
}