feat(entity): add ECS-based entity rendering

include/Cubed/gameplay/client_world.hpp

@@ -14,6 +14,7 @@
 
 #include <absl/container/flat_hash_set.h>
 #include <deque>
+#include <entt/entt.hpp>
 #include <tbb/concurrent_hash_map.h>
 #include <tbb/concurrent_queue.h>
 #include <tbb/concurrent_unordered_map.h>
@@ -46,6 +47,10 @@ struct PlayerRenderData {
 class WorldScene;
 class ClientWorld {
 public:
+    ClientWorld(const ClientWorld&) = delete;
+    ClientWorld(ClientWorld&&) = delete;
+    ClientWorld& operator=(const ClientWorld&) = delete;
+    ClientWorld& operator=(ClientWorld&&) = delete;
     ClientWorld(AudioEngine& auido, Config& config, WorldScene& scene);
     ~ClientWorld();
     void init(std::string_view player_name,
@@ -110,7 +115,7 @@ public:
     void send_chat_message(ChatMessage& message);
     void receive_voice_message(VoiceMsg& msg);
     bool enable_voice_chat() const;
-
+    const entt::registry& get_registry();
     template <typename Fn>
     void register_ticktimer(std::string_view id, TickType threshold, Fn&& f) {
         m_ticktimers.emplace(
@@ -147,6 +152,9 @@ private:
 
     static constexpr int WORLD_EXIT_TIMEOUT = 200;
     static constexpr int MAX_UPLOAD_CHUNK_SUM = 16;
+
+    entt::registry m_registry;
+
     ClientPlayer m_player;
     OtherPlayerHashMap m_player_info;
     ChunkHashMap m_chunks;

include/Cubed/gameplay/entity.hpp

@@ -0,0 +1,18 @@
+#pragma once
+#include <glm/glm.hpp>
+#include <string>
+namespace Cubed {
+struct Transform {
+    glm::vec3 pos;
+};
+
+struct Model {
+    std::string name;
+};
+
+struct Health {
+    float hp = 0;
+    float max_hp = 20;
+};
+
+} // namespace Cubed

include/Cubed/render/world_renderer.hpp

@@ -132,6 +132,7 @@ private:
 
     void render_underwater(ClientWorld& world);
     void render_outline(ClientWorld& world);
+    void render_entity(ClientWorld& world);
     void render_player(ClientWorld& world);
 
     void render_normal_block(const glm::mat4& model_mat,