Eigen
├── Boost
└── glm

GLFW
├── Boost
└── GLEW

ImGui
├── GLFW
└── spdlog

#include <Eigen/Core>
#include <Eigen/Geometry>
#include <GLFW/glfw3.h>
#include <glm/glm.hpp>
#include <ImGui/imgui.h>
#include <spdlog/spdlog.h>

GLFWwindow* window;

void init() {
  // 初始化 GLFW
  glfwInit();
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
  
  // 创建窗口
  window = glfwCreateWindow(640, 480, "Game", nullptr, nullptr);
  glfwMakeContextCurrent(window);
  
  // 初始化 GLEW
  glewInit();
  
  // 初始化 ImGui
  ImGui::CreateContext();
  ImGui::StyleColorsDark();
  ImGui_Implopengl3_Init();
  ImGui_ImplGlfw_InitForOpenGL(window, true);
}

void update() {
  // 更新游戏状态
  
  // 绘制 ImGui UI
  ImGui_Implopengl3_NewFrame();
  ImGui_ImplGlfw_NewFrame();
  ImGui::NewFrame();
  ImGui::Begin("Game");
  ImGui::Text("Hello, world!");
  ImGui::End();
  ImGui::Render();
}

void render() {
  // 去除颜色缓冲区
  glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
  glClear(GL_COLOR_BUFFER_BIT);
  
  // 视口 transformation
  Eigen::Matrix4f projection = Eigen::Matrix4f::Identity();
  projection(0, 0) = 2.0f / 640.0f;
  projection(1, 1) = 2.0f / 480.0f;
  glViewport(0, 0, 640, 480);
  glMatrixMode(GL_PROJECTION);
  glLoadMatrixf(projection.data());
  
  // 绘制物体
  
  // ImGui 绘制
  ImGui_Implopengl3_RenderDrawData(ImGui::GetDrawData());
}

void cleanup() {
  // 清理 ImGui
  ImGui_Implopengl3_Shutdown();
  ImGui_ImplGlfw_Shutdown();
  ImGui::DestroyContext();
  
  // 清理 GLFW
  glfwDestroyWindow(window);
  glfwTerminate();
}

int main() {
  init();
  while (!glfwWindowShouldClose(window)) {
    update();
    render();
    glfwSwapBuffers(window);
    glfwPollEvents();
  }
  cleanup();
  return 0;
}