feat(world): add day/night cycle with server tick system

assets/shaders/block_f_shader.glsl

@@ -19,7 +19,7 @@ void main(void) {
         discard;
     }
 
-    vec3 lightDir = normalize(sunlightDir);
+    vec3 lightDir = normalize(-sunlightDir);
     
     vec3 ambient = ambientStrength * sunlightColor;
     

assets/shaders/sky_f_shader.glsl

@@ -2,8 +2,10 @@
 
 out vec4 frag_color;
 
+uniform vec3 color;
+
 void main(void) {
     
-    frag_color = vec4(0.529, 0.808, 0.922, 1.0);
+    frag_color = vec4(color, 1.0);
 
 }

include/Cubed/dev_panel.hpp

@@ -44,8 +44,11 @@ private:
     bool m_need_save_config = false;
     bool m_gen_thread_running = true;
     int m_theme = 0;
+    int m_pre_set_day_tick = 0;
+    int m_pre_set_tick_speed = 0;
     void show_about_table_bar();
     void show_biome_table_bar();
+    void show_time_table_bar();
     void show_cave_table_bar();
     void show_river_table_bar();
     void show_settings_tab_item();

include/Cubed/gameplay/game_time.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+using TickType = long long;
+
+constexpr int DEFAULT_PER_TICK_TIME = 50;
+
+constexpr TickType DAY_TIME = 24000;
+
+constexpr TickType PER_HOUR = 1000;

include/Cubed/gameplay/world.hpp

@@ -2,6 +2,7 @@
 #include "Cubed/AABB.hpp"
 #include "Cubed/gameplay/cave_carver.hpp"
 #include "Cubed/gameplay/chunk.hpp"
+#include "Cubed/gameplay/game_time.hpp"
 #include "Cubed/gameplay/river_worm.hpp"
 
 #include <atomic>
@@ -39,13 +40,21 @@ private:
         std::unordered_map<ChunkPos, const Chunk*, ChunkPos::Hash>;
     using ChunkPosSet = std::unordered_set<ChunkPos, ChunkPos::Hash>;
     using ChunkHashMap = std::unordered_map<ChunkPos, Chunk, ChunkPos::Hash>;
+
     glm::vec3 m_gen_player_pos{0.0f, 0.0f, 0.0f};
-    glm::vec3 m_sunlight_dir{1.0f, 2.0f, 1.0f};
     ChunkHashMap m_chunks;
     std::unordered_map<std::size_t, Player> m_players;
     std::vector<glm::vec4> m_planes;
 
     std::thread m_gen_thread;
+    std::thread m_server_thread;
+
+    std::stop_source m_server_stop_source;
+
+    std::atomic<int> m_per_tick_time = DEFAULT_PER_TICK_TIME; // ms
+
+    std::atomic<TickType> m_day_tick = 6000;
+
     mutable std::mutex m_chunks_mutex;
     std::mutex m_gen_signal_mutex;
     std::mutex m_new_chunk_queue_mutex;
@@ -62,6 +71,9 @@ private:
     std::atomic<bool> m_could_gen{true};
     std::atomic<int> m_rendering_distance{24};
     std::atomic<float> m_chunk_gen_fraction{0.0f};
+
+    std::atomic<TickType> m_game_ticks{0};
+
     std::vector<ChunkPos> m_dirty_queue;
     std::vector<ChunkRenderSnapshot> m_render_snapshots;
     std::vector<std::pair<ChunkPos, Chunk>> m_new_chunk;
@@ -120,7 +132,10 @@ public:
     int rendering_distance() const;
     void rendering_distance(int rendering_distance);
     void start_gen_thread();
+    void start_server_thread();
     void stop_gen_thread();
+    void stop_server_thread();
+    void serever_run(std::stop_token stoken);
 
     CaveCarver& cave_carcer();
     RiverWorm& river_worm();
@@ -128,6 +143,11 @@ public:
     std::vector<ChunkRenderSnapshot>& render_snapshots();
 
     glm::vec3 sunlight_dir() const;
+    TickType game_tick() const;
+    TickType day_tick() const;
+    void day_tick(TickType tick);
+    int per_tick_time() const;
+    void per_tick_time(int ms);
 };
 
 } // namespace Cubed

include/Cubed/renderer.hpp

@@ -31,6 +31,13 @@ public:
 
 private:
     static constexpr glm::vec3 SUNLIGHT_COLOR{1.0f, 1.0f, 1.0f};
+    static constexpr glm::vec3 SUN_COLOR{1.00f, 0.95f, 0.80f};
+    static constexpr glm::vec3 MOON_COLOR{0.75f, 0.80f, 1.00f};
+    static constexpr glm::vec3 SKY_COLOR{0.529, 0.808, 0.922};
+    static constexpr float FAR_PLANE = 1000.0f;
+    static constexpr float NEAR_PLANE = 0.1f;
+    static constexpr float SUN_SIZE = 50.0f;
+    static constexpr float MOON_SIZE = 50.0f;
     const Camera& m_camera;
     DevPanel& m_dev_panel;
     const TextureManager& m_texture_manager;
@@ -75,6 +82,7 @@ private:
     2 - outline vao
     3 - ui vao
     4 - text vao
+
     */
     std::vector<GLuint> m_vao;
     std::vector<Vertex2D> m_ui;

src/dev_panel.cpp

@@ -263,6 +263,29 @@ void DevPanel::show_biome_table_bar() {
     }
 }
 
+void DevPanel::show_time_table_bar() {
+    World& world = m_app.world();
+    ImGui::Text("Game Tick %lld", world.game_tick());
+    ImGui::Text("Day Tick %lld", world.day_tick());
+    ImGui::Text("Set Day Tick");
+    ImGui::SameLine();
+    if (ImGui::SliderInt("DayTick", &m_pre_set_day_tick, 0, DAY_TIME)) {
+    }
+    ImGui::SameLine();
+    if (ImGui::Button("Save##DayTick")) {
+        world.day_tick(static_cast<TickType>(m_pre_set_day_tick));
+    }
+    ImGui::Text("MSPT %d", world.per_tick_time());
+    ImGui::Text("Set MSPT");
+    ImGui::SameLine();
+    if (ImGui::SliderInt("SetMSPT", &m_pre_set_tick_speed, 0, 200)) {
+    }
+    ImGui::SameLine();
+    if (ImGui::Button("Save##MSPT")) {
+        world.per_tick_time(m_pre_set_tick_speed);
+    }
+}
+
 void DevPanel::show_cave_table_bar() {
     auto& cave_carcer = m_app.world().cave_carcer();
 
@@ -457,6 +480,10 @@ void DevPanel::show_world_tab_item() {
         ImGui::Text("Chunk Build Progress\n");
         ImGui::ProgressBar(m_app.world().chunk_gen_fraction());
         if (ImGui::BeginTabBar("World Settings")) {
+            if (ImGui::BeginTabItem("Time")) {
+                show_time_table_bar();
+                ImGui::EndTabItem();
+            }
             if (ImGui::BeginTabItem("Cave")) {
                 show_cave_table_bar();
                 ImGui::EndTabItem();

src/gameplay/world.cpp

@@ -7,6 +7,8 @@
 
 #include <execution>
 
+using namespace std::chrono;
+
 namespace Cubed {
 
 struct ChunkRenderData {
@@ -18,6 +20,7 @@ World::World() {}
 
 World::~World() {
     stop_gen_thread();
+    stop_server_thread();
     m_chunks.clear();
     {
         std::lock_guard lk(m_delete_vbo_mutex);
@@ -86,6 +89,8 @@ void World::init_world() {
     auto d = std::chrono::duration_cast<std::chrono::milliseconds>(t2 - t1);
     Logger::info("Chunk Block Init Finish, Time Consuming: {}", d);
 
+    start_server_thread();
+
     Logger::info("TestPlayer Create Finish");
 }
 void World::init_chunks() {
@@ -727,6 +732,11 @@ void World::start_gen_thread() {
     });
 }
 
+void World::start_server_thread() {
+    m_server_thread = std::thread(
+        [this]() { serever_run(m_server_stop_source.get_token()); });
+}
+
 void World::stop_gen_thread() {
     m_gen_running = false;
     m_gen_cv.notify_all();
@@ -736,6 +746,23 @@ void World::stop_gen_thread() {
     Logger::info("Gen Thread Stopped");
 }
 
+void World::stop_server_thread() {
+    m_server_stop_source.request_stop();
+    if (m_server_thread.joinable()) {
+        m_server_thread.join();
+    }
+}
+
+void World::serever_run(std::stop_token stoken) {
+    Logger::info("Server Thread Started!");
+    while (!stoken.stop_requested()) {
+        std::this_thread::sleep_for(milliseconds(m_per_tick_time));
+        ++m_game_ticks;
+        m_day_tick = (++m_day_tick) % DAY_TIME;
+    }
+    Logger::info("Server Thread Stopped!");
+}
+
 void World::need_gen() {
     if (!m_could_gen) {
         Logger::warn("It is generating or consuming new chunks");
@@ -1006,6 +1033,47 @@ std::vector<glm::vec4>& World::planes() { return m_planes; }
 std::vector<ChunkRenderSnapshot>& World::render_snapshots() {
     return m_render_snapshots;
 };
-glm::vec3 World::sunlight_dir() const { return m_sunlight_dir; }
+/*
+glm::vec3 World::sunlight_dir() const {
+    float t = static_cast<float>(m_day_tick) / DAY_TIME;
+
+    float azimuth = glm::radians(90.0f - t * 360.0f);
+
+    float altitude =
+        glm::half_pi<float>() * sin((t - 0.25f) * glm::two_pi<float>());
+
+    glm::vec3 dir{cos(altitude) * cos(azimuth), sin(altitude),
+                  cos(altitude) * sin(azimuth)};
+
+    return glm::normalize(dir);
+}
+*/
+
+glm::vec3 World::sunlight_dir() const {
+    float altitude = sin((m_day_tick - 6 * PER_HOUR) /
+                         static_cast<float>(DAY_TIME / 2) * std::numbers::pi) *
+                     90.0f;
+
+    float t = static_cast<float>(m_day_tick) / DAY_TIME;
+    float azimuth = 90.0f - 360.0f * (t - 0.25f);
+
+    float alt = glm::radians(altitude);
+    float az = glm::radians(azimuth);
+    glm::vec3 dir;
+    dir.x = cos(alt) * sin(az);
+    dir.y = sin(alt);
+    dir.z = cos(alt) * cos(az);
+
+    return glm::normalize(-dir);
+}
+
+TickType World::game_tick() const { return m_game_ticks.load(); }
+TickType World::day_tick() const { return m_day_tick.load(); }
+void World::day_tick(TickType tick) {
+    tick %= DAY_TIME;
+    m_day_tick = tick;
+}
+int World::per_tick_time() const { return m_per_tick_time.load(); }
+void World::per_tick_time(int ms) { m_per_tick_time = ms; }
 
 } // namespace Cubed

src/renderer.cpp

@@ -257,13 +257,44 @@ void Renderer::render_sky() {
 
     glUniformMatrix4fv(m_mv_loc, 1, GL_FALSE, glm::value_ptr(m_mv_mat));
     glUniformMatrix4fv(m_proj_loc, 1, GL_FALSE, glm::value_ptr(m_p_mat));
-
+    glUniform3fv(shader.loc("color"), 1, glm::value_ptr(SKY_COLOR));
     glBindVertexArray(m_vao[1]);
 
     glDisable(GL_DEPTH_TEST);
 
     glDrawArrays(GL_TRIANGLES, 0, 36);
     glEnable(GL_DEPTH_TEST);
+
+    // draw sun and moon
+    glDepthMask(GL_FALSE);
+
+    glBindVertexArray(m_vao[0]);
+    // draw sum
+    glm::vec3 sun_pos = m_camera.get_camera_pos() +
+                        normalize(-m_world.sunlight_dir()) * (FAR_PLANE * 0.9f);
+    glm::vec3 sun_view_pos = glm::vec3(m_v_mat * glm::vec4(sun_pos, 1.0f));
+    m_mv_mat = glm::translate(glm::mat4(1.0f), sun_view_pos) *
+               glm::scale(glm::mat4(1.0f), glm::vec3(SUN_SIZE)) *
+               glm::translate(glm::mat4(1.0f), glm::vec3(-0.5f, -0.5f, 0.0f));
+    glUniformMatrix4fv(m_mv_loc, 1, GL_FALSE, glm::value_ptr(m_mv_mat));
+    glUniformMatrix4fv(m_proj_loc, 1, GL_FALSE, glm::value_ptr(m_p_mat));
+    glUniform3fv(shader.loc("color"), 1, glm::value_ptr(SUN_COLOR));
+
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+
+    glm::vec3 moon_pos = m_camera.get_camera_pos() +
+                         normalize(m_world.sunlight_dir()) * (FAR_PLANE * 0.9f);
+    glm::vec3 moon_view_pos = glm::vec3(m_v_mat * glm::vec4(moon_pos, 1.0f));
+    m_mv_mat = glm::translate(glm::mat4(1.0f), moon_view_pos) *
+               glm::scale(glm::mat4(1.0f), glm::vec3(MOON_SIZE)) *
+               glm::translate(glm::mat4(1.0f), glm::vec3(-0.5f, -0.5f, 0.0f));
+    glUniformMatrix4fv(m_mv_loc, 1, GL_FALSE, glm::value_ptr(m_mv_mat));
+    glUniformMatrix4fv(m_proj_loc, 1, GL_FALSE, glm::value_ptr(m_p_mat));
+    glUniform3fv(shader.loc("color"), 1, glm::value_ptr(MOON_COLOR));
+
+    glDrawArrays(GL_TRIANGLES, 0, 6);
+
+    glDepthMask(GL_TRUE);
 }
 
 void Renderer::render_text() {
@@ -343,7 +374,8 @@ void Renderer::update_fov(float fov) {
 
 void Renderer::update_proj_matrix(float aspect, float width, float height) {
     m_aspect = aspect;
-    m_p_mat = glm::perspective(glm::radians(m_fov), aspect, 0.1f, 1000.0f);
+    m_p_mat =
+        glm::perspective(glm::radians(m_fov), aspect, NEAR_PLANE, FAR_PLANE);
     m_ui_proj = glm::ortho(0.0f, width, height, 0.0f, -1.0f, 1.0f);
     // scale and then translate
     m_ui_m_matrix =