OpenGL创建一个GLFW窗口

• 先上图，再解答。
• 完整主要的源代码
• 源代码剖析

先上图，再解答。

完整主要的源代码

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

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

const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;

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

#ifdef __APPLE__
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
#endif

    GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "it_xiangqiang", NULL, NULL);
    if (window == NULL)
    {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
    {
        std::cout << "Failed to initialize GLAD" << std::endl;
        return -1;
    }    

    while (!glfwWindowShouldClose(window))
    {
        processInput(window);

        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

void processInput(GLFWwindow *window)
{
    if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
}

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

源代码剖析

void framebuffer_size_callback(GLFWwindow* window, int width, int height)//每当窗口大小更改（通过操作系统或用户调整大小）时，此回调函数就会执行

void processInput(GLFWwindow *window)//查询GLFW是否在此帧中按下/释放了相关的按键并做出相应的反应

glfwTerminate();//终止，清除所有先前分配的GLFW资源

glfwSwapBuffers(window);//交换缓冲区和轮询IO事件（按下/释放键，移动鼠标等）

gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)//加载所有OpenGL函数指针

GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, “it_xiangqiang”, NULL, NULL);//glfw窗口创建

glfwInit();//初始化和配置

while (!glfwWindowShouldClose(window)){}//渲染循环

glViewport(0, 0, width, height);//确保视口与新窗口尺寸匹配； 请注意，宽度和高度将大大大于视网膜显示器上指定的宽度和高度。