如何以交互方式在OpenGL中绘制基元？

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

// Vertex shader source code
const char* vertexShaderSource = "#version 330 core\n"
    "layout(location = 0) in vec4 aPos;\n"
    "void main()\n"
    "{\n"
    "   gl_Position = aPos;\n"
    "}\n";

// Fragment shader source code
const char* fragmentShaderSource = "#version 330 core\n"
    "out vec4 FragColor;\n"
    "void main()\n"
    "{\n"
    "   FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
    "}\n";

int main()
{
    // Initialize GLFW
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    // Create GLFW window
    GLFWwindow* window = glfwCreateWindow(800, 600, "OpenGL Triangle", NULL, NULL);
    if (window == NULL)
    {
        std::cout << "Failed to create GLFW window"<< std::endl;
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    // Initialize GLEW
    glewExperimental = true;
    if (glewInit() != GLEW_OK)
    {
        std::cout << "Failed to initialize GLEW"<< std::endl;
        return -1;
    }

    // Compile and link shader program
    unsigned int shaderProgram = glCreateProgram();
    unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
    unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);

    glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
    glCompileShader(vertexShader);
    // ...

    // Create vertex buffer object
    unsigned int VBO, VAO;
    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);

    glBindVertexArray(VAO);
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(triangleVertices), &triangleVertices, GL_STATIC_DRAW);

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);

    glBindVertexArray(0);

    // Main loop
    while (!glfwWindowShouldClose(window))
    {
        // Input
        processInput(window);

        // Render
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);

        glUseProgram(shaderProgram);
        glBindVertexArray(VAO);
        glDrawArrays(GL_TRIANGLES, 0, 3);

        // Swap buffers and poll IO events
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    // Clean up
    glDeleteVertexArrays(1, &VAO);
    glDeleteBuffers(1, &VBO);
    glDeleteProgram(shaderProgram);

    glfwTerminate();
    return 0;
}