Opengl仅绘制创建的第一个对象

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <vector>

struct Object {
    GLuint vao, vbo;
    void init() {
        // 初始化VAO和VBO
        glGenVertexArrays(1, &vao);
        glGenBuffers(1, &vbo);
        // 绑定VAO和VBO，上传顶点数据
    }
    void draw() {
        glBindVertexArray(vao);
        glDrawArrays(GL_TRIANGLES, 0, 3);
    }
};

int main() {
    if (!glfwInit()) return -1;
    GLFWwindow* window = glfwCreateWindow(640, 480, "OpenGL", NULL, NULL);
    if (!window) {
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    glewInit();

    std::vector<Object> objects(3); // 创建3个对象
    for (auto& object : objects) {
        object.init();
    }

    while (!glfwWindowShouldClose(window)) {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        for (auto& object : objects) {
            object.draw();
        }
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}