OpenGL on Windows 环境

#include <glad/glad.h> 

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>

void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow* window);


int main() {
    glfwInit(); // init glfw

    // use version 3.3
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // set major version
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); // set minor version

    glfwWindowHint(GLFW_OPENGL_PROFILE,
        GLFW_OPENGL_CORE_PROFILE); // use core profile
    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);   // 800*600 size window called LearnOpenGL
    if (window == NULL) {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();    // 释放/删除之前的分配的所有资源
        return -1;
    }
    glfwMakeContextCurrent(window);   // set the current window
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        std::cout << "Failed to initialize GLAD" << std::endl;
        return -1;
    }
    glViewport(0, 0, 800, 600);    // 设置窗口位置
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);    // 设置窗口大小调整回调

    // 循环检查窗口是否需要被关闭
    while (!glfwWindowShouldClose(window)){
      
        processInput(window);    // 监控ESC退出窗口
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);     // 调用glClearColor来设置清空屏幕所用的颜色
        glClear(GL_COLOR_BUFFER_BIT);    // 调用glClear函数来清空屏幕的颜色缓冲
        glfwSwapBuffers(window);    // 函数会交换颜色缓冲（它是一个储存着GLFW窗口每一个像素颜色值的大缓冲），它在这一迭代中被用来绘制，并且将会作为输出显示在屏幕上。
        glfwPollEvents();    // 检查有没有触发什么事件（比如键盘输入、鼠标移动等）、更新窗口状态，并调用对应的回调函数（可以通过回调方法手动设置）
    }

    // 释放/删除之前的分配的所有资源
    glfwTerminate();

    return 0;
}



void framebuffer_size_callback(GLFWwindow* window, int width, int height){
    glViewport(0, 0, width, height);
}

// 监控ESC退出窗口
void processInput(GLFWwindow* window){
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
}