OpenGL学习记录一（环境配置）

opengl 文档查询地址 ： https://docs.gl/

参考教程 (文章)：https://learnopengl-cn.github.io/

视频: https://www.patreon.com/thecherno

bilibili  翻译版 ：最好的OpenGL教程之一

使用社区版vs studio ，安装时仅选择c++桌面开发，够用

学习记录对应的git地址 ：OpenGLDemo

下载 glfw 、 glew   学习以32位

(界面基于 studio 2022)

1.创建empty c++项目

 2.添加src 目录，添加cpp 文件

 3.配置项目属性  (可跳过glfw)

下载glfw

下载glew

 

源目录创建依赖目录，并将相关依赖拷贝过去

将下载的glfw 或者 glew

 

glew

 

 添加/修改配置

$(SolutionDir)Dependencies\GLEW\include

$(SolutionDir)Dependencies\GLEW\include

 

 链接库，glew使用

 输入(user、gdi等是因为前面的系统配置全部清掉，这里需要补充)

 

 glfw的话，复制 https://www.glfw.org/documentation.html 的代码

#include <GLFW/glfw3.h>
int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);


        /*»­Èý½ÇÐÎ*/
        glBegin(GL_TRIANGLES);
        glVertex2f(-0.5f,-0.5f);
        glVertex2f(0.0f, 0.5f);
        glVertex2f(0.5f, -0.5f);
        glEnd();


        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

如果 #include <GLFW/glfw3.h> 引用爆红，调试环境改为下载的库-对应 x86或者64

 glew

/*fatal  error C1189: #error:  gl.h included before glew.h   需要放到前面*/
#include <GL/glew.h>

#include <GLFW/glfw3.h>

#include <iostream>

int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;
  

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);



    /*初始化 glew  需要放在 glfwMakeContextCurrent  创建上下文之后*/
    if (glewInit() != GLEW_OK)
        std::cout << "Error " << std::endl;

    /*获取版本*/
    std::cout << glGetString(GL_VERSION) << std::endl;

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);


        /*画三角形*/
        glBegin(GL_TRIANGLES);
        glVertex2f(-0.5f,-0.5f);
        glVertex2f(0.0f, 0.5f);
        glVertex2f(0.5f, -0.5f);
        glEnd();


        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

遇到的问题

fatal error C1189: #error: gl.h included before glew.h 需要放到GLFW前面/

#include <GL/glew.h>

#include <GLFW/glfw3.h>

无法解析的外部符号 __imp__glewInit@0，函数 _main 中引用了该符号

需要定义glew static（内部使用dll）

c++->预处理器->预处理器定义->添加GLEW_STATIC;