feat: async world generation

src/gameplay/chunk.cpp

@@ -12,26 +12,45 @@ Chunk::Chunk(World& world, ChunkPos chunk_pos) :
 
 Chunk::~Chunk() {
     if (m_vbo != 0) {
-        glDeleteBuffers(1, &m_vbo);
+        m_world.push_delete_vbo(m_vbo);
     }
     
 }
 
+Chunk::Chunk(Chunk&& other) : 
+    m_vbo(other.m_vbo),
+    m_chunk_pos(std::move(other.m_chunk_pos)),
+    m_world(other.m_world),
+    m_blocks(std::move(other.m_blocks)),
+    m_dirty(other.is_dirty()),
+    m_vertexs_data(std::move(other.m_vertexs_data))
+{
+    other.m_vbo = 0;
+}
 
+Chunk& Chunk::operator=(Chunk&& other) {
+    m_vbo = other.m_vbo;
+    other.m_vbo = 0;
+    m_chunk_pos = std::move(other.m_chunk_pos);
+    m_blocks = std::move(other.m_blocks);
+    m_dirty = other.is_dirty();
+    m_vertexs_data = std::move(other.m_vertexs_data);
+    return *this;
+}
 
 const std::vector<uint8_t>& Chunk::get_chunk_blocks() const{
     return m_blocks;
 }
 
-
 int Chunk::get_index(int x, int y, int z) {
+    CUBED_ASSERT(!(x < 0 || y < 0 || z < 0 || x >= CHUCK_SIZE || y >= WORLD_SIZE_Y || z >= CHUCK_SIZE));
     if ((x * WORLD_SIZE_Y + y) * CHUCK_SIZE + z < 0 || (x * WORLD_SIZE_Y + y) * CHUCK_SIZE + z >= CHUCK_SIZE * CHUCK_SIZE * WORLD_SIZE_Y) {
         Logger::error("block pos x {} y {} z {} range error", x, y, z);
         CUBED_ASSERT(0);
     }
     return (x * WORLD_SIZE_Y + y) * CHUCK_SIZE + z;
 }
-
+// this is thread-unsafe!
 void Chunk::gen_vertex_data() {
     m_vertexs_data.clear();
     
@@ -84,18 +103,104 @@ void Chunk::gen_vertex_data() {
             
         }
     }
+    
+}
 
-    if (m_vbo == 0) {
-        glGenBuffers(1, &m_vbo);
-        
+void Chunk::gen_vertex_data(const std::vector<const std::vector<uint8_t>*>& neighbor_block) {
+    m_vertexs_data.clear();
+    
+    static const glm::ivec3 DIR[6] = {
+        {0,0,1},{1,0,0},{0,0,-1},{-1,0,0},{0,1,0},{0,-1,0}
+    };
+
+    for (int x = 0; x < SIZE_X; x++) {
+        for (int y = 0; y < SIZE_Y; y++) {
+            for (int z = 0; z < SIZE_Z; z++) {
+                int world_x = x + m_chunk_pos.x * CHUCK_SIZE;
+                int world_z = z + m_chunk_pos.z * CHUCK_SIZE;
+                int world_y = y;
+                int id = m_blocks[get_index(x, y, z)];
+                // air
+                if (id == 0) {
+                    continue;
+                }
+                for (int face = 0; face < 6; face++) {
+                    int nx = x + DIR[face].x;
+                    int ny = y + DIR[face].y;
+                    int nz = z + DIR[face].z;
+                    bool neighbor_soild = false;
+
+                    if (nx < 0 || nx >= SIZE_X || ny < 0 || ny >= SIZE_Y || nz < 0 || nz>= SIZE_Z) {
+                        
+                        int world_nx = world_x + DIR[face].x;
+                        int world_ny = world_y + DIR[face].y;
+                        int world_nz = world_z + DIR[face].z;
+
+                        auto [neighbor_x, neighbor_z] = World::chunk_pos(world_nx, world_nz);
+                        
+                        auto is_block = [&](const std::vector<uint8_t>* chunk_blocks){
+                            if (chunk_blocks == nullptr) {
+                                return false;
+                            }
+                            int x, y, z;
+                            y = world_ny;
+                            x = world_nx - neighbor_x * CHUCK_SIZE;
+                            z = world_nz - neighbor_z * CHUCK_SIZE;
+                            if (x < 0 || y < 0 || z < 0 || x >= CHUCK_SIZE || y >= WORLD_SIZE_Y || z >= CHUCK_SIZE) {
+                                return false;
+                            }
+                            
+                            int idx = Chunk::get_index(x, y, z);
+                            // not init
+                            if (idx >= chunk_blocks->size()) {
+                                Logger::warn("not init");
+                                return false;
+                            }
+                            auto id = (*chunk_blocks)[idx];
+                            if (id == 0) {
+                                return false;
+                            } else {
+                                return true;
+                            }
+                        };
+
+                        if (m_chunk_pos.x + 1 == neighbor_x) {
+                            neighbor_soild = is_block(neighbor_block[0]);
+                        } else if (m_chunk_pos.x - 1 == neighbor_x) {
+                            neighbor_soild = is_block(neighbor_block[1]);
+                        } else if (m_chunk_pos.z + 1 == neighbor_z) {
+                            neighbor_soild = is_block(neighbor_block[2]);
+                        } else if (m_chunk_pos.z - 1 == neighbor_z) {
+                            neighbor_soild = is_block(neighbor_block[3]);
+                        }
+                        //neighbor_soild = m_world.is_block(glm::ivec3(world_x, world_y, world_z) + DIR[face]);
+                    } else {
+                        if (m_blocks[get_index(nx, ny, nz)] != 0) {
+                            neighbor_soild = true;
+                        }
+                    }
+
+                    if (neighbor_soild) {
+                        continue;
+                    }
+                    for (int i = 0; i < 6; i++) {
+                        Vertex vex = {
+                            VERTICES_POS[face][i][0] + (float)world_x * 1.0f,
+                            VERTICES_POS[face][i][1] + (float)world_y * 1.0f,
+                            VERTICES_POS[face][i][2] + (float)world_z * 1.0f,
+                            TEX_COORDS[face][i][0],
+                            TEX_COORDS[face][i][1],
+                            static_cast<float>(id * 6 + face) 
+
+                        };
+                        m_vertexs_data.emplace_back(vex);
+                    }    
+                }
+            }
+            
+        }
     }
     
-    glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
-    glBufferData(GL_ARRAY_BUFFER, m_vertexs_data.size() * sizeof(Vertex), m_vertexs_data.data(), GL_DYNAMIC_DRAW);
-    glBindBuffer(GL_ARRAY_BUFFER, 0);
-
-    
-
 }
 
 GLuint Chunk::get_vbo() const{
@@ -135,12 +240,26 @@ void Chunk::init_chunk() {
         }
     }
 
-    m_is_gened = true;
+    mark_dirty();
     
 }
 
+void Chunk::upload_to_gpu() {
+
+    CUBED_ASSERT(is_dirty());
+    if (m_vbo == 0) {
+        glGenBuffers(1, &m_vbo);   
+    }
+    glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+    glBufferData(GL_ARRAY_BUFFER, m_vertexs_data.size() * sizeof(Vertex), m_vertexs_data.data(), GL_DYNAMIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    // after fininshed it, can use
+    clear_dirty();
+
+}
+
 bool Chunk::is_dirty() const{
-    return m_dirty;
+    return m_dirty.load();
 }
 
 void Chunk::mark_dirty() {

src/gameplay/world.cpp

@@ -1,5 +1,5 @@
-#include <Cubed/gameplay/player.hpp>
 #include <Cubed/gameplay/world.hpp>
+#include <Cubed/gameplay/player.hpp>
 #include <Cubed/map_table.hpp>
 #include <Cubed/tools/cubed_assert.hpp>
 #include <Cubed/tools/cubed_hash.hpp>
@@ -12,7 +12,15 @@ World::World() {
 }
 
 World::~World() {
-
+    stop_gen_thread();
+    m_chunks.clear();
+    {
+        std::lock_guard lk(m_delete_vbo_mutex);
+        for (auto x : m_pending_delete_vbo) {
+            glDeleteBuffers(1, &x);
+        }
+        m_pending_delete_vbo.clear();
+    }
 }
 
 bool World::can_move(const AABB& player_box) const{
@@ -104,6 +112,7 @@ void World::init_world() {
         auto& [chunk_pos, chunk] = chunk_map;
 
         chunk.gen_vertex_data();
+        chunk.upload_to_gpu();
         
     }
     auto t2 = std::chrono::system_clock::now();
@@ -112,15 +121,18 @@ void World::init_world() {
     // init players
     m_players.emplace(HASH::str("TestPlayer"), Player(*this, "TestPlayer"));
     Logger::info("TestPlayer Create Finish");
+
+    start_gen_thread();
+
 }
 
 void World::render(const glm::mat4& mvp_matrix) {
     Math::extract_frustum_planes(mvp_matrix, m_planes);
-    for (const auto& chunk_map : m_chunks) {
-        const auto& [pos, chunk] = chunk_map;
-        glm::vec3 center = glm::vec3(static_cast<float>(pos.x * CHUCK_SIZE) + static_cast<float>(CHUCK_SIZE / 2), static_cast<float>(WORLD_SIZE_Y/ 2), static_cast<float>(pos.z * CHUCK_SIZE) + static_cast<float>(CHUCK_SIZE / 2));
-        if (is_aabb_in_frustum(center, glm::vec3(static_cast<float>(CHUCK_SIZE / 2), static_cast<float>(WORLD_SIZE_Y / 2), static_cast<float>(CHUCK_SIZE / 2)))) {
-            glBindBuffer(GL_ARRAY_BUFFER, chunk.get_vbo());
+
+    for (const auto& snapshot : m_render_snapshots) {
+        
+        if (is_aabb_in_frustum(snapshot.center, snapshot.half_extents)) {
+            glBindBuffer(GL_ARRAY_BUFFER, snapshot.vbo);
             glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
             glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, s));
             glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, layer));
@@ -129,7 +141,7 @@ void World::render(const glm::mat4& mvp_matrix) {
             glEnableVertexAttribArray(1);
             glEnableVertexAttribArray(2);
 
-            glDrawArrays(GL_TRIANGLES, 0, chunk.get_vertex_data().size());
+            glDrawArrays(GL_TRIANGLES, 0, snapshot.vertex_count);
             glBindBuffer(GL_ARRAY_BUFFER, 0);
 
         }
@@ -139,7 +151,7 @@ void World::render(const glm::mat4& mvp_matrix) {
 
 }
 
-ChunkPos World::chunk_pos(int world_x, int world_z) const{
+ChunkPos World::chunk_pos(int world_x, int world_z) {
     int chunk_x, chunk_z;
     if (world_x < 0) {
         chunk_x = (world_x + 1) / CHUCK_SIZE - 1;
@@ -156,9 +168,9 @@ ChunkPos World::chunk_pos(int world_x, int world_z) const{
     return {chunk_x, chunk_z};
 }
 
-void World::gen_chunks() {
-    const auto& player =  get_player("TestPlayer");
-    const auto& player_pos = player.get_player_pos();
+void World::gen_chunks_internal() {
+
+    const auto& player_pos = m_gen_player_pos;
 
     int x = std::floor(player_pos.x);
     int z = std::floor(player_pos.z);
@@ -173,20 +185,22 @@ void World::gen_chunks() {
         }
     }
     CUBED_ASSERT_MSG(!cur_chunks.empty(), "cur chunks is empty!!");
-
-    for (auto it = m_chunks.begin(); it != m_chunks.end(); ) {
-        if (cur_chunks.find(it->first) == cur_chunks.end()) {
-            it = m_chunks.erase(it);
-        } else {
-            ++it;
+    std::vector<std::pair<ChunkPos, Chunk>> new_chunks;
+    {
+        std::lock_guard lk(m_chunks_mutex);
+        for (auto it = m_chunks.begin(); it != m_chunks.end(); ) {
+            if (cur_chunks.find(it->first) == cur_chunks.end()) {
+                it = m_chunks.erase(it);
+            } else {
+                ++it;
+            }
         }
-    }
 
-    for (auto pos: cur_chunks) {
-        auto it = m_chunks.find(pos);
-        if (it == m_chunks.end()) {
-            m_chunks.emplace(pos, Chunk(*this, pos));
-            pre_gen_chunks.push_back(pos);
+        for (auto pos: cur_chunks) {
+            auto it = m_chunks.find(pos);
+            if (it == m_chunks.end()) {
+                pre_gen_chunks.push_back(pos);
+            }
         }
     }
 
@@ -194,27 +208,94 @@ void World::gen_chunks() {
     if (pre_gen_chunks.empty()) {
         return;
     }
+
+    for (auto& pos : pre_gen_chunks) {
+        new_chunks.push_back({pos, Chunk(*this, pos)});
+    }
+    
     static const ChunkPos CHUNK_DIR[] {
-        {1, 0}, {-1, 0}, {0, -1}, {0, 1}
+        {1, 0}, {-1, 0}, {0, 1}, {0, -1}
     };
-    for (const auto& pos : pre_gen_chunks) {
-        auto it = m_chunks.find(pos);
-        CUBED_ASSERT_MSG(it != m_chunks.end(), "Chunk Don't find");
-        //Logger::info("Init Chunk {} {}", pos.x, pos.z);
-        it->second.init_chunk();
-        it->second.mark_dirty();
-        for (const auto& dir : CHUNK_DIR) {
-            auto it = m_chunks.find(pos + dir);
-            if (it != m_chunks.end()) {
-                it->second.mark_dirty();
+    
+    std::unordered_map<ChunkPos, const Chunk&, ChunkPos::Hash> neighbor;
+
+    {
+        std::lock_guard lk(m_chunks_mutex);
+        for (auto& [pos, chunk] : new_chunks) {
+            for (const auto& dir : CHUNK_DIR) {
+                auto it = m_chunks.find(pos + dir);
+                if (it != m_chunks.end()) {
+                    neighbor.insert({it->first, (it->second)});
+                }
             }
         }
     }
     
+    std::vector<const std::vector<uint8_t>*> neighbor_block(4);
+
+    for (auto& [pos, chunk] : new_chunks) {
+
+        chunk.init_chunk();
+        neighbor.insert({pos, chunk});
+        
+    }
+
+    for (auto& [pos, chunk] : new_chunks) {
+        for (int i = 0; i < 4; i++) {
+            auto it = neighbor.find(pos + CHUNK_DIR[i]);
+            if (it != neighbor.end()) {
+                neighbor_block[i] = &(it->second.get_chunk_blocks());
+            } else {
+                neighbor_block[i] = nullptr;
+            }
+        }
+        chunk.gen_vertex_data(neighbor_block);
+    }
+
+    {
+        std::lock_guard lk(m_new_chunk_queue_mutex);
+        for (auto& x : new_chunks) {
+            m_new_chunk_queue.emplace_back(std::move(x));
+        }
+        
+    }
+     
+}
+
+void World::start_gen_thread() {
+    m_gen_running = true;
+    Logger::info("Gen Thread Started");
+    m_gen_thread = std::thread([this](){
+        while (m_gen_running) {
+            std::unique_lock<std::mutex> lk(m_gen_signal_mutex);
+
+            m_gen_cv.wait(lk, [this](){
+                return m_need_gen_chunk.load() || !m_gen_running;
+            });
+            if (!m_gen_running) {
+                break;
+            }
+            m_need_gen_chunk = false;
+            lk.unlock();
+
+            gen_chunks_internal();
+        }
+    });
+}
+
+void World::stop_gen_thread() {
+    m_gen_running = false;
+    m_gen_cv.notify_all();
+    if (m_gen_thread.joinable()) {
+        m_gen_thread.join();
+    }
+    Logger::info("Gen Thread Stopped");
 }
 
 void World::need_gen() {
+    m_gen_player_pos = get_player("TestPlayer").get_player_pos();
     m_need_gen_chunk = true;
+    m_gen_cv.notify_one();
 }
 
 bool World::is_aabb_in_frustum(const glm::vec3& center, const glm::vec3& half_extents) {
@@ -254,13 +335,11 @@ int World::get_block(const glm::ivec3& block_pos) const {
 
 bool World::is_block(const glm::ivec3& block_pos) const{
     auto [chunk_x, chunk_z] = chunk_pos(block_pos.x, block_pos.z);
-
     auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
 
     if (it == m_chunks.end()) {
         return false;
     }
-
     const auto& chunk_blocks = it->second.get_chunk_blocks();
     int x, y, z;
     y = block_pos.y;
@@ -279,11 +358,11 @@ bool World::is_block(const glm::ivec3& block_pos) const{
 
 void World::set_block(const glm::ivec3& block_pos, unsigned id) {
 
-    
     int world_x, world_y, world_z;
     world_x = block_pos.x;
     world_y = block_pos.y;
     world_z = block_pos.z;
+
     auto [chunk_x, chunk_z] = chunk_pos(world_x, world_z);
 
     auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
@@ -323,17 +402,55 @@ void World::set_block(const glm::ivec3& block_pos, unsigned id) {
 void World::update(float delta_time) {
     for (auto& player : m_players) {
         player.second.update(delta_time);
+    }  
+    {
+        std::lock_guard lk(m_delete_vbo_mutex);
+        for (auto x : m_pending_delete_vbo) {
+            glDeleteBuffers(1, &x);
+        }
+        m_pending_delete_vbo.clear();
     }
-    if (m_need_gen_chunk) {
-        gen_chunks();
-        m_need_gen_chunk = false;
+    {
+        std::scoped_lock lk(m_chunks_mutex, m_new_chunk_queue_mutex);
+        m_new_chunk.clear();
+        for (auto& x : m_new_chunk_queue) {
+            m_new_chunk.emplace_back(std::move(x));
+        }
+        m_new_chunk_queue.clear();
     }
-    
+
+    for (auto& x : m_new_chunk) {
+        x.second.upload_to_gpu();
+    }
+
     // unified compute vertex data before rendering
-    for (auto& [key, chunk] : m_chunks) {
-        if (chunk.is_dirty()) {
-            chunk.gen_vertex_data();
-            chunk.clear_dirty();
+    {   
+        std::lock_guard lk(m_chunks_mutex);
+        for (auto& x : m_new_chunk) {
+            m_chunks.insert_or_assign(x.first, std::move(x.second));
+        }
+        m_render_snapshots.clear();
+        for (auto& [pos, chunk] : m_chunks) {
+            if (chunk.is_dirty()) {
+                // the curial fator influence
+                chunk.gen_vertex_data();
+                chunk.upload_to_gpu();
+            }
+            if (!chunk.is_dirty()) {
+                m_render_snapshots.push_back({
+                    chunk.get_vbo(),
+                    chunk.get_vertex_data().size(),
+                    glm::vec3(static_cast<float>(pos.x * CHUCK_SIZE) + static_cast<float>(CHUCK_SIZE / 2), static_cast<float>(WORLD_SIZE_Y/ 2), static_cast<float>(pos.z * CHUCK_SIZE) + static_cast<float>(CHUCK_SIZE / 2)),
+                    glm::vec3(static_cast<float>(CHUCK_SIZE / 2), static_cast<float>(WORLD_SIZE_Y / 2), static_cast<float>(CHUCK_SIZE / 2))
+                    }
+                );
+            }
+            
         }
     }
+}
+
+void World::push_delete_vbo(GLuint vbo) {
+    std::lock_guard lk(m_delete_vbo_mutex);
+    m_pending_delete_vbo.push_back(vbo);
 }

src/gameplay/world_thread_preview.cpp

@@ -1,392 +0,0 @@
-#include <Cubed/gameplay/world_thread_preview.hpp>
-#include <Cubed/gameplay/player.hpp>
-#include <Cubed/map_table.hpp>
-#include <Cubed/tools/cubed_assert.hpp>
-#include <Cubed/tools/cubed_hash.hpp>
-#include <Cubed/tools/math_tools.hpp>
-
-#include <unordered_set>
-
-World::World() {
-    
-}
-
-World::~World() {
-    stop_gen_thread();
-}
-
-bool World::can_move(const AABB& player_box) const{
-
-    return true;
-}
-/*
-const BlockRenderData& World::get_block_render_data(int world_x, int world_y ,int world_z) {
-    auto [chunk_x, chunk_z] = chunk_pos(world_x, world_z);
-    //Logger::info("Chunk PosX : {} Chuch PosZ : {}", chunk_x, chunk_z);
-    auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
-    CUBED_ASSERT_MSG(it != m_chunks.end(), "Chunk not find");
-    
-    const auto& chunk_blocks = it->second.get_chunk_blocks();
-    int x, y, z;
-    y = world_y;
-    x = world_x - chunk_x * CHUCK_SIZE;
-    z = world_z - chunk_z * CHUCK_SIZE;
-    //BlockRenderData m_block_render_data;
-    // block id
-    m_block_render_data.block_id = chunk_blocks[Chunk::get_index(x, y, z)];
-    if (m_block_render_data.block_id == 0) {
-        return m_block_render_data;
-    }
-    // draw_face
-    m_block_render_data.draw_face.assign(6, true);
-    static const std::vector<glm::ivec3> DIR = {
-        glm::ivec3(0, 0, 1),
-        glm::ivec3(1, 0, 0),
-        glm::ivec3(0 ,0, -1),
-        glm::ivec3(-1, 0, 0),
-        glm::ivec3(0, 1, 0),
-        glm::ivec3(0, -1, 0)
-    };
-    glm::ivec3 world_pos = glm::ivec3(world_x, world_y, world_z);
-    for (int i = 0; i < 6; i++) {
-        if (is_block(world_pos + DIR[i])) {
-            m_block_render_data.draw_face[i] = false;
-        }
-    }
-
-    return m_block_render_data;
-}
-*/
-const std::optional<LookBlock>& World::get_look_block_pos(const std::string& name) const{
-    static std::optional<LookBlock> null_look_block = std::nullopt;
-    auto it = m_players.find(HASH::str(name));
-    if (it == m_players.end()) {
-        Logger::error("Can't find player {}", name);
-        CUBED_ASSERT(0);
-        return null_look_block;
-    }
-
-    return it->second.get_look_block_pos();
-    
-}
-
-Player& World::get_player(const std::string& name){
-    auto it = m_players.find(HASH::str(name));
-    if (it == m_players.end()) {
-        Logger::error("Can't find player {}", name);
-        CUBED_ASSERT(0);
-    }
-    
-    return it->second;
-}
-
-
-void World::init_world() {
-    auto t1 = std::chrono::system_clock::now();
-    for (int s = 0; s < DISTANCE; s++) {
-        for (int t = 0; t < DISTANCE; t++) {
-            int ns = s - DISTANCE / 2;
-            int nt = t - DISTANCE / 2;
-
-            ChunkPos pos{ns, nt};
-
-            m_chunks.emplace(pos, Chunk(*this, pos)); 
-        }
-    }
-
-    for (auto& chunk_map : m_chunks) {
-        auto& [chunk_pos, chunk] = chunk_map;
-        chunk.init_chunk();
-        
-    }
-    // After block gen fininshed
-    for (auto& chunk_map : m_chunks) {
-        auto& [chunk_pos, chunk] = chunk_map;
-
-        chunk.gen_vertex_data();
-        
-    }
-    auto t2 = std::chrono::system_clock::now();
-    auto d = std::chrono::duration_cast<std::chrono::milliseconds>(t2 - t1);
-    Logger::info("Chunk Block Init Finish, Time Consuming: {}", d);
-    // init players
-    m_players.emplace(HASH::str("TestPlayer"), Player(*this, "TestPlayer"));
-    Logger::info("TestPlayer Create Finish");
-
-    start_gen_thread();
-
-}
-
-void World::render(const glm::mat4& mvp_matrix) {
-    Math::extract_frustum_planes(mvp_matrix, m_planes);
-
-    for (const auto& snapshot : m_render_snapshots) {
-        
-        if (is_aabb_in_frustum(snapshot.center, snapshot.half_extents)) {
-            glBindBuffer(GL_ARRAY_BUFFER, snapshot.vbo);
-            glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
-            glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, s));
-            glVertexAttribPointer(2, 1, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, layer));
-
-            glEnableVertexAttribArray(0);
-            glEnableVertexAttribArray(1);
-            glEnableVertexAttribArray(2);
-
-            glDrawArrays(GL_TRIANGLES, 0, snapshot.vertex_count);
-            glBindBuffer(GL_ARRAY_BUFFER, 0);
-
-        }
-        
-
-    }
-
-}
-
-ChunkPos World::chunk_pos(int world_x, int world_z) const{
-    int chunk_x, chunk_z;
-    if (world_x < 0) {
-        chunk_x = (world_x + 1) / CHUCK_SIZE - 1;
-    }
-    if (world_x >= 0) {
-        chunk_x = world_x / CHUCK_SIZE;
-    }
-    if (world_z < 0) {
-        chunk_z = (world_z + 1) / CHUCK_SIZE - 1;
-    }
-    if (world_z >= 0) {
-        chunk_z = world_z / CHUCK_SIZE;
-    }
-    return {chunk_x, chunk_z};
-}
-
-void World::gen_chunks_internal() {
-
-    const auto& player_pos = m_gen_player_pos;
-
-    int x = std::floor(player_pos.x);
-    int z = std::floor(player_pos.z);
-    auto [chunk_x, chunk_z] = chunk_pos(x, z);
-    std::unordered_set<ChunkPos, ChunkPos::Hash> cur_chunks;
-    std::vector<ChunkPos> pre_gen_chunks;
-    cur_chunks.reserve(DISTANCE * DISTANCE);
-    int half = DISTANCE / 2;
-    for (int u = chunk_x - half; u <= chunk_x + half; ++u) {
-        for (int v = chunk_z - half; v <= chunk_z + half; ++v) {
-            cur_chunks.emplace(u, v);
-        }
-    }
-    CUBED_ASSERT_MSG(!cur_chunks.empty(), "cur chunks is empty!!");
-    std::vector<std::pair<ChunkPos, Chunk>> new_chunks;
-    {
-        std::lock_guard lk(m_chunks_mutex);
-        for (auto it = m_chunks.begin(); it != m_chunks.end(); ) {
-            if (cur_chunks.find(it->first) == cur_chunks.end()) {
-                it = m_chunks.erase(it);
-            } else {
-                ++it;
-            }
-        }
-
-        for (auto pos: cur_chunks) {
-            auto it = m_chunks.find(pos);
-            if (it == m_chunks.end()) {
-                pre_gen_chunks.push_back(pos);
-            }
-        }
-    }
-
-    Logger::info("New Gen Chunks Sum: {}", pre_gen_chunks.size());
-    if (pre_gen_chunks.empty()) {
-        return;
-    }
-
-    for (auto& pos : pre_gen_chunks) {
-        new_chunks.push_back({pos, Chunk(*this, pos)});
-    }
-
-    for (auto& [pos, chunk] : new_chunks) {
-        chunk.init_chunk();
-    }
-
-
-
-    static const ChunkPos CHUNK_DIR[] {
-        {1, 0}, {-1, 0}, {0, -1}, {0, 1}
-    };
-
-    {
-        std::lock_guard lk(m_chunks_mutex);
-        for (auto& [pos, chunk] : new_chunks) {
-            chunk.mark_dirty();
-            m_chunks.emplace(pos, std::move(chunk));
-            for (const auto& dir : CHUNK_DIR) {
-                auto it = m_chunks.find(pos + dir);
-                if (it != m_chunks.end()) {
-                    it->second.mark_dirty();
-                }
-            }
-        }
-    } 
-}
-
-void World::start_gen_thread() {
-    m_gen_running = true;
-    Logger::info("Gen Thread Started");
-    m_gen_thread = std::thread([this](){
-        while (m_gen_running) {
-            std::unique_lock<std::mutex> lk(m_gen_signal_mutex);
-
-            m_gen_cv.wait(lk, [this](){
-                return m_need_gen_chunk.load() || !m_gen_running;
-            });
-            if (!m_gen_running) {
-                break;
-            }
-            m_need_gen_chunk = false;
-            lk.unlock();
-
-            gen_chunks_internal();
-        }
-    });
-}
-
-void World::stop_gen_thread() {
-    m_gen_running = false;
-    m_gen_cv.notify_all();
-    if (m_gen_thread.joinable()) {
-        m_gen_thread.join();
-    }
-    Logger::info("Gen Thread Stopped");
-}
-
-void World::need_gen() {
-    m_gen_player_pos = get_player("TestPlayer").get_player_pos();
-    m_need_gen_chunk = true;
-    m_gen_cv.notify_one();
-}
-
-bool World::is_aabb_in_frustum(const glm::vec3& center, const glm::vec3& half_extents) {
-    for (const auto& plane : m_planes) {
-        // distance
-        float d = glm::dot(glm::vec3(plane), center) + plane.w;
-        float r = half_extents.x * std::abs(plane.x) +
-                  half_extents.y * std::abs(plane.y) +
-                  half_extents.z * std::abs(plane.z);
-        if (d + r < 0) {
-            return false;
-        }
-    }
-    return true;
-}
-
-int World::get_block(const glm::ivec3& block_pos) const {
-    auto [chunk_x, chunk_z] = chunk_pos(block_pos.x, block_pos.z);
-
-    auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
-
-    if (it == m_chunks.end()) {
-        return 0;
-    }
-
-    const auto& chunk_blocks = it->second.get_chunk_blocks();
-    int x, y, z;
-    y = block_pos.y;
-    x = block_pos.x - chunk_x * CHUCK_SIZE;
-    z = block_pos.z - chunk_z * CHUCK_SIZE;
-    if (x < 0 || y < 0 || z < 0 || x >= CHUCK_SIZE || y >= WORLD_SIZE_Y || z >= CHUCK_SIZE) {
-        return 0;
-    }
-    return chunk_blocks[Chunk::get_index(x, y, z)];
-
-}
-
-bool World::is_block(const glm::ivec3& block_pos) const{
-    auto [chunk_x, chunk_z] = chunk_pos(block_pos.x, block_pos.z);
-    auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
-
-    if (it == m_chunks.end()) {
-        return false;
-    }
-    const auto& chunk_blocks = it->second.get_chunk_blocks();
-    int x, y, z;
-    y = block_pos.y;
-    x = block_pos.x - chunk_x * CHUCK_SIZE;
-    z = block_pos.z - chunk_z * CHUCK_SIZE;
-    if (x < 0 || y < 0 || z < 0 || x >= CHUCK_SIZE || y >= WORLD_SIZE_Y || z >= CHUCK_SIZE) {
-        return false;
-    }
-    auto id = chunk_blocks[Chunk::get_index(x, y, z)];
-    if (id == 0) {
-        return false;
-    } else {
-        return true;
-    }
-}
-
-void World::set_block(const glm::ivec3& block_pos, unsigned id) {
-
-    
-    int world_x, world_y, world_z;
-    world_x = block_pos.x;
-    world_y = block_pos.y;
-    world_z = block_pos.z;
-    auto [chunk_x, chunk_z] = chunk_pos(world_x, world_z);
-
-    auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
-
-    if (it == m_chunks.end()) {
-        return ;
-    }
-
-    int x, y, z;
-    y = world_y;
-    x = world_x - chunk_x * CHUCK_SIZE;
-    z = world_z - chunk_z * CHUCK_SIZE;
-    if (x < 0 || y < 0 || z < 0 || x >= CHUCK_SIZE || y >= WORLD_SIZE_Y || z >= CHUCK_SIZE) {
-        return ;
-    }
-
-    it->second.set_chunk_block(Chunk::get_index(x, y, z), id);
-
-    static const glm::ivec3 NEIGHBOR_DIRS[] = {
-        {1, 0, 0}, {-1, 0, 0}, {0, 0, -1}, {0, 0, 1}
-    };
-
-    for (const auto& dir : NEIGHBOR_DIRS) {
-        glm::ivec3 neighbor = block_pos + dir;
-
-        auto [cx, cz] = chunk_pos(neighbor.x, neighbor.z);
-        auto it = m_chunks.find({cx, cz});
-        if (it != m_chunks.end()) {
-            it->second.mark_dirty();
-
-        }
-    }
-
-
-}
-
-void World::update(float delta_time) {
-    for (auto& player : m_players) {
-        player.second.update(delta_time);
-    }
-    
-    
-    // unified compute vertex data before rendering
-    {   
-        std::lock_guard lk(m_chunks_mutex);
-        m_render_snapshots.clear();
-        for (auto& [pos, chunk] : m_chunks) {
-            if (chunk.is_dirty()) {
-                chunk.gen_vertex_data();
-                chunk.clear_dirty();
-            }
-            m_render_snapshots.push_back({
-                chunk.get_vbo(),
-                chunk.get_vertex_data().size(),
-                glm::vec3(static_cast<float>(pos.x * CHUCK_SIZE) + static_cast<float>(CHUCK_SIZE / 2), static_cast<float>(WORLD_SIZE_Y/ 2), static_cast<float>(pos.z * CHUCK_SIZE) + static_cast<float>(CHUCK_SIZE / 2)),
-                glm::vec3(static_cast<float>(CHUCK_SIZE / 2), static_cast<float>(WORLD_SIZE_Y / 2), static_cast<float>(CHUCK_SIZE / 2))
-            });
-        }
-    }
-}