feat(gameplay): add entity managers and refactor to ECS components

src/gameplay/server_entity_manager.cpp

@@ -0,0 +1,53 @@
+#include "Cubed/gameplay/server_entity_manager.hpp"
+
+#include "Cubed/gameplay/creatures/pig.hpp"
+#include "Cubed/gameplay/ecs/identity.hpp"
+#include "Cubed/gameplay/ecs/server_entity.hpp"
+#include "Cubed/gameplay/hitbox_manager.hpp"
+#include "Cubed/gameplay/server_world.hpp"
+#include "Cubed/gameplay/session.hpp"
+#include "Cubed/tools/cubed_assert.hpp"
+#include "Cubed/tools/net_utils.hpp"
+using namespace google::protobuf;
+
+namespace Cubed {
+ServerEntityManager::ServerEntityManager(ServerWorld& world) : m_world(world) {}
+
+void ServerEntityManager::init() {
+    m_factories.try_emplace("cubed:pig", [this]() {
+        BaseServerCreature c;
+        c.hitbox = HitboxManager::instance().get_hitbox_id("cubed:pig");
+        return add_entity(Entity{m_next}, EntityInfo{"cubed:pig", ""},
+                          std::move(c), PigTag{});
+    });
+}
+
+void ServerEntityManager::add_entity(std::string_view name,
+                                     const glm::vec3& pos) {
+    ASSERT(m_factories.contains(name));
+    auto e = m_factories[name]();
+    acc c;
+    if (m_entities.find(c, e)) {
+        auto t = m_registry.try_get<BaseServerCreature>(c->second);
+        ASSERT(t);
+        t->transform.position.value = pos;
+    }
+    send_entity_create(e, name, pos);
+}
+
+void ServerEntityManager::send_entity_create(EntityID id, std::string_view name,
+                                             const glm::vec3& pos) {
+    auto sessions = m_world.get_all_session();
+
+    Arena arena;
+    auto* s2c = Arena::Create<S2CEntityCreate>(&arena);
+    s2c->set_id(id);
+    s2c->set_name(name);
+    Tools::set_net_pos(s2c, pos);
+
+    for (auto& s : sessions) {
+        s->send(make_packet(*s2c));
+    }
+}
+
+} // namespace Cubed