1. 监听窗口，绑定回调函数

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>void framebuffer_size_callback(GLFWwindow* window, int width, int height) {glViewport(0, 0, width, height);std::cout << "变了" << std::endl;
}int main()
{glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);if (window == NULL){std::cout << "Failed to create GLFW window" << std::endl;glfwTerminate();return -1;}glfwMakeContextCurrent(window);if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){std::cout << "Failed to initialize GLAD" << std::endl;return -1;}glViewport(0, 0, 800, 600);glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);while (!glfwWindowShouldClose(window)){glfwSwapBuffers(window);glfwPollEvents();}glfwTerminate();return 0;
}

2. 通过监听键盘Esc，是否关闭窗口

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>//窗口大小回调函数
void framebuffer_size_callback(GLFWwindow* window, int width, int height) {glViewport(0, 0, width, height);std::cout << "变了" << std::endl;
}void processInput(GLFWwindow* window) {if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {glfwSetWindowShouldClose(window, true);}
}int main()
{glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);if (window == NULL){std::cout << "Failed to create GLFW window" << std::endl;glfwTerminate();return -1;}glfwMakeContextCurrent(window);if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){std::cout << "Failed to initialize GLAD" << std::endl;return -1;}glViewport(0, 0, 800, 600);glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);while (!glfwWindowShouldClose(window)){processInput(window);glfwSwapBuffers(window);glfwPollEvents();}glfwTerminate();return 0;
}

3.  清空屏幕

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>//窗口大小回调函数
void framebuffer_size_callback(GLFWwindow* window, int width, int height) {glViewport(0, 0, width, height);std::cout << "变了" << std::endl;
}void processInput(GLFWwindow* window) {if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {glfwSetWindowShouldClose(window, true);}
}int main()
{glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);if (window == NULL){std::cout << "Failed to create GLFW window" << std::endl;glfwTerminate();return -1;}glfwMakeContextCurrent(window);if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){std::cout << "Failed to initialize GLAD" << std::endl;return -1;}glViewport(0, 0, 800, 600);glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);while (!glfwWindowShouldClose(window)){processInput(window);//渲染指令glClearColor(0.2f, 0.3f, 0.3f, 1.0f);glClear(GL_COLOR_BUFFER_BIT);glfwSwapBuffers(window);glfwPollEvents();}glfwTerminate();return 0;
}

你好，窗口 - LearnOpenGL CN (learnopengl-cn.github.io)

你好，三角形 - LearnOpenGL CN (learnopengl-cn.github.io)