OpenGL学习——搭建OpenGL运行环境——生成一个空白视口——基于GLFW&GLEW

// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <GLFW/glfw3.h>
#include <iostream>

int main(){
    // glfw init
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

    //create a glfw window
    GLFWwindow *window = glfwCreateWindow(640, 360, "hi", nullptr, nullptr);
    if (window == nullptr){
        std::cout << "create glfw window failed..." << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);//set current window

    // glew init
     glewExperimental = GL_TRUE;
    if (glewInit() != GLEW_OK){
        std::cout << "glew init failed..." << std::endl;
        return -1;
    }

    //get width and height from glfw window
    int width, height;
    glfwGetFramebufferSize(window, &width, &height);
    //define the glViewport
    glViewport(0, 0, width, height);

    //add the game loop
    while (!glfwWindowShouldClose(window)){
        //check event
        glfwPollEvents();
        
        //your OpenGL code logical
        //now clear window
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);//the gl color buffer bit

        //swap buffer
        glfwSwapBuffers(window);
    }

    //the end, glfw window has been closed
    glfwTerminate();
    return 0;
}