[C++知识库]2021-07-29 配置小记 Mac M1 + CLion + OpenGL

一开始运行brew install glew时出现了错误，如图：

查了下资料，需依次运行以下命令（其中ls -al可以不运行）：

brew update --verbose
cd /opt/homebrew/Library/Taps/homebrew/homebrew-core
ls -al
git fetch --prune origin
git pull --rebase origin master
brew update

运行结果如图：

接着再运行之前的命令，就可以了：

brew install glew
brew install glfw

打开CLion并创建一个新项目，配置CMakeLists：
（版本号要看自己安装的到底是多少）

cmake_minimum_required(VERSION 3.19)
project(opengl)

set(CMAKE_CXX_STANDARD 14)

# Add header file
set(GLEW_H /opt/homebrew/Cellar/glew/2.2.0_1/include/GL)
set(GLFW_H /opt/homebrew/Cellar/glfw/3.3.4/include/GLFW)
include_directories(${GLEW_H} ${GLFW_H})

# Add target link
set(GLEW_LINK /opt/homebrew/Cellar/glew/2.2.0_1/lib/libGLEW.2.2.dylib)
set(GLFW_LINK /opt/homebrew/Cellar/glfw/3.3.4/lib/libglfw.3.dylib)
link_libraries(${OPENGL} ${GLEW_LINK} ${GLFW_LINK})

# Execute compilation command
set(SOURCE_FILES main.cpp)
add_executable(opengl main.cpp)

if (APPLE)
    target_link_libraries(opengl "-framework OpenGL")
    target_link_libraries(opengl "-framework GLUT")
endif()

其中，需要注意的是header file和target的路径。由于之前查资料，看到的教程都是写 /usr/local/Cellar，但自己却没有这条路径，仔细看了一下之前安装glew和glfw时出现的信息，发现是：

/opt/homebrew/Cellar

所以header file和target的路径需修改成：（比如）

/opt/homebrew/Cellar/glew/2.2.0_1/include/GL

对应的版本号也要根据自己安装后的版本进行修改
CMakeLists完成后，会发现多了两个新目录，GL和GLFW：

最后在main.cpp里：

#include <iostream>
#include <glew.h>
#include <glfw3.h>

using namespace std;

void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
    //If you press ESC and set windowShouldClose to True, the outer loop will close the application
    if(key==GLFW_KEY_ESCAPE && action == GLFW_PRESS)
        glfwSetWindowShouldClose(window, GL_TRUE);
    std::cout<<"ESC"<<mode;
}

int main()
{
    if(!glfwInit())
        return -1;
    //Create window and context
    GLFWwindow* window = glfwCreateWindow(640, 480, "hello world", NULL, NULL);
    if(!window)
    {
        //Create failure will return NULL
        glfwTerminate();
    }
    glfwMakeContextCurrent(window);

    glfwSetKeyCallback(window, key_callback); //Register callback function
    while(!glfwWindowShouldClose(window))
    {
        glfwPollEvents();

        glClearColor(0.2, 0.3, 0.3, 1);
        glClear(GL_COLOR_BUFFER_BIT);

        glBegin(GL_TRIANGLES);
        glColor3f(1, 0, 0); //Red
        glVertex3f(0, 1, 1);

        glColor3f(0, 1, 0); //Green
        glVertex3f(-1, -1, 0);

        glColor3f(0, 0, 1); //Blue
        glVertex3f(1, -1, 0);
        //End a drawing step
        glEnd();

        glBegin(GL_POLYGON);
        //Draw another trapezoid, you need to pay attention to the stroke order
        glColor3f(0.5, 0.5, 0.5); //Grey
        glVertex2d(0.5, 0.5);
        glVertex2d(1, 1);
        glVertex2d(1, 0);
        glVertex2d(0.5, 0);
        glEnd();


        /******Exchange buffer, update the content on the window******/
        glfwSwapBuffers(window);
    }
    glfwTerminate();
    return 0;
}

运行后看到以下结果即配置成功：