refactor: chunk render (#15)

* refactor(renderer): centralize VAO setup and rename init_underwater

* refactor(gameplay): replace VBO with VAO for vertex data

* fix(renderer): move depth test enable to world rendering

The `glEnable(GL_DEPTH_TEST)` call was incorrectly placed in the general `render()` function, affecting UI and text rendering. Moved it to the start of the world rendering loop to ensure depth testing is only active during 3D world pass.

include/Cubed/gameplay/chunk.hpp

@@ -101,16 +101,16 @@ public:
         const std::array<const std::vector<BlockType>*, 4>& neighbor_block);
     void upload_to_gpu();
 
-    GLuint get_normal_vbo() const;
+    GLuint get_normal_vao() const;
     size_t get_normal_vertices_sum() const;
 
-    GLuint get_cross_vbo() const;
+    GLuint get_cross_vao() const;
     size_t get_cross_vertices_sum() const;
 
-    GLuint get_normal_discard_vbo() const;
+    GLuint get_normal_discard_vao() const;
     size_t get_normal_discard_vertices_sum() const;
 
-    GLuint get_normal_blend_vbo() const;
+    GLuint get_normal_blend_vao() const;
     size_t get_normal_blend_vertices_sum() const;
 
     bool is_dirty() const;

include/Cubed/gameplay/vertex_data.hpp

@@ -9,6 +9,7 @@ class World;
 struct VertexData {
     std::vector<Vertex> m_vertices;
     GLuint m_vbo = 0;
+    GLuint m_vao = 0;
     std::atomic<std::size_t> m_sum{0};
     World& m_world;
     VertexData(World& world);

include/Cubed/gameplay/world.hpp

@@ -15,13 +15,13 @@
 namespace Cubed {
 
 struct ChunkRenderSnapshot {
-    GLuint normal_vbo;
+    GLuint normal_vao;
     size_t normal_vertices_count;
-    GLuint cross_vbo;
+    GLuint cross_vao;
     size_t cross_vertices_count;
-    GLuint normal_discard_vbo;
+    GLuint normal_discard_vao;
     size_t normal_discard_vertices_count;
-    GLuint normal_blend_vbo;
+    GLuint normal_blend_vao;
     size_t normal_blend_vertices_count;
     glm::vec3 center;
     glm::vec3 half_extents;
@@ -47,8 +47,10 @@ private:
     std::mutex m_gen_signal_mutex;
     std::mutex m_new_chunk_queue_mutex;
     std::mutex m_delete_vbo_mutex;
+    std::mutex m_delete_vao_mutex;
     std::mutex m_gen_player_pos_mutex;
     std::vector<GLuint> m_pending_delete_vbo;
+    std::vector<GLuint> m_pending_delete_vao;
     std::condition_variable m_gen_cv;
     std::atomic<bool> m_gen_running{false};
     std::atomic<bool> m_need_gen_chunk{false};
@@ -104,7 +106,7 @@ public:
     void update(float delta_time);
 
     void push_delete_vbo(GLuint vbo);
-
+    void push_delete_vao(GLuint vao);
     void hot_reload();
 
     void rebuild_world();

include/Cubed/renderer.hpp

@@ -67,10 +67,18 @@ private:
     glm::mat4 m_ui_proj;
     glm::mat4 m_ui_m_matrix;
     std::unordered_map<std::size_t, Shader> m_shaders;
+
+    /*
+    0 - quad vao
+    1 - sky vao
+    2 - outline vao
+    3 - ui vao
+    4 - text vao
+    */
     std::vector<GLuint> m_vao;
     std::vector<Vertex2D> m_ui;
 
-    void init_underwater();
+    void init_quad();
     void init_text();
 
     void render_outline();