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#include "ecs.hpp"
TypeSafeInt_B(EntityHandle);
const uint64_t bucketItemCount = 256;
struct EntityBucket{
Entity entities[bucketItemCount];
};
uint64_t entityBucketIncrementer = 2;
EntityHandle_T entityBucketCounter{0};
EntityHandle_T entityCounter{0};
EntityBucket *entityBuckets = nullptr;
DynArray<EntityHandle> entitiesMarkedForRemoval{16};
DynArray<EntityHandle> EntitiesToBeRemoved{16};
void ECS_Init() {
entityBuckets = pke::PkeNew<EntityBucket>(entityBucketIncrementer);
}
EntityHandle ECS_CreateEntity_Inner(EntityHandle parentEntityHandle) {
EntityHandle_T entityHandle_T{Buckets_NewHandle<EntityBucket>(bucketItemCount, entityBucketIncrementer, entityBucketCounter, entityCounter, entityBuckets)};
EntityHandle entityHandle{entityHandle_T};
Entity *entity = &entityBuckets[Buckets_GetBucketIndex(entityHandle_T)].entities[Buckets_GetItemIndex(entityHandle_T)];
entity->handle = entityHandle;
entity->parentHandle = parentEntityHandle;
return entityHandle;
}
EntityHandle ECS_CreateEntity(EntityHandle parentEntityHandle) {
return ECS_CreateEntity_Inner(parentEntityHandle);
}
void ECS_MarkForRemoval(EntityHandle entityHandle) {
auto b = Buckets_GetBucketIndex(static_cast<EntityHandle_T>(entityHandle));
auto e = Buckets_GetItemIndex(static_cast<EntityHandle_T>(entityHandle));
const Entity *ent = &entityBuckets[b].entities[e];
assert(ent->isMarkedForRemoval == false && "Entity already marked for removal");
entitiesMarkedForRemoval.Push(entityHandle);
}
void ECS_Tick(double delta) {
EntitiesToBeRemoved.Resize(0);
for (long b = 0; b <= entityBucketCounter; ++b) {
uint64_t entCount = b == entityBucketCounter ? entityCounter >> 32 : bucketItemCount;
for (long e = 0; e < entCount; ++e) {
Entity *ent = &entityBuckets[b].entities[e];
if (ent->handle == EntityHandle{EntityHandle_T{0xFFFFFFFFFFFFFFFF}}) continue;
if (ent->isMarkedForRemoval) {
ent->handle = EntityHandle{EntityHandle_T{0xFFFFFFFFFFFFFFFF}};
ent->parentHandle = EntityHandle{EntityHandle_T{0xFFFFFFFFFFFFFFFF}};
ent->isMarkedForRemoval = false;
} else {
if (entitiesMarkedForRemoval.Has(ent->handle)) {
ent->isMarkedForRemoval = true;
EntitiesToBeRemoved.Push(ent->handle);
continue;
}
if (EntitiesToBeRemoved.Has(ent->parentHandle)) {
ent->isMarkedForRemoval = true;
EntitiesToBeRemoved.Push(ent->handle);
}
}
}
}
entitiesMarkedForRemoval.Resize(0);
}
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