[057]macOS使用CLion写OpenGL

王小二

发布于 2020-06-16 17:46:25

1K0

发布于 2020-06-16 17:46:25

一、下载需要用到的库

执行以下指令

brew install glew
brew install glfw

下面是我的执行结果

16:45 Kobe-Wang:~$ brew install glew
==> Downloading https://homebrew.bintray.com/bottles/glew-2.1.0_1.catalina.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/59/590c10bf98e6263d8e573720e5521584d836f28c52f30f97840614e97c16ccfd?__gda__=exp=1592039864~hmac=7a7b8afc3de94c51f0e0532c8a2192efb4be6e944
######################################################################## 100.0%
==> Pouring glew-2.1.0_1.catalina.bottle.tar.gz
?  /usr/local/Cellar/glew/2.1.0_1: 38 files, 3MB
17:05 Kobe-Wang:~$ brew install glfw
==> Downloading https://homebrew.bintray.com/bottles/glfw-3.3.2.catalina.bottle.tar.gz
######################################################################## 100.0%
==> Pouring glfw-3.3.2.catalina.bottle.tar.gz
?  /usr/local/Cellar/glfw/3.3.2: 14 files, 493KB

记住关键两个路径，后面要用到。

/usr/local/Cellar/glew/2.1.0_1
/usr/local/Cellar/glfw/3.3.2

二、新建CLion项目

大家可以新建一个CLion项目，然后修改CMakeList.txt

新建生成的CMakeList.txt

cmake_minimum_required(VERSION 3.13)
project(StudyOpenGL) #这就是我的项目名，你们自己可以随意取

set(CMAKE_CXX_STANDARD 11)
add_executable(StudyOpenGL main.cpp)

修改之后的CMakeList.txt

cmake_minimum_required(VERSION 3.13)
project(StudyOpenGL) #这就是我的项目名，你们自己可以随意取

set(CMAKE_CXX_STANDARD 11)

# 添加头文件 就是前面记录的路径
set(GLEW_H /usr/local/Cellar/glew/2.1.0_1/include/GL)
set(GLFW_H /usr/local/Cellar/glfw/3.3.2/include/GLFW)
include_directories(${GLEW_H} ${GLFW_H})

# 添加目标链接 就是前面记录的路径
set(GLEW_LINK /usr/local/Cellar/glew/2.1.0_1/lib/libGLEW.2.1.dylib)
set(GLFW_LINK /usr/local/Cellar/glfw/3.3.2/lib/libglfw.3.dylib)
link_libraries(${OPENGL} ${GLEW_LINK} ${GLFW_LINK})

add_executable(StudyOpenGL main.cpp)

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

三、写OpenGL的hello world

以下就是main.cpp的代码，复制文章macOS下使用Clion写OpenGL的代码。

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

using namespace std;

void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
    //如果按下ESC，把windowShouldClose设置为True，外面的循环会关闭应用
    if(key==GLFW_KEY_ESCAPE && action == GLFW_PRESS)
        glfwSetWindowShouldClose(window, GL_TRUE);
    std::cout<<"ESC"<<mode;
}

int main()
{
    if(!glfwInit())
        return -1;
    //创建窗口以及上下文
    GLFWwindow* window = glfwCreateWindow(640, 480, "hello world", NULL, NULL);
    if(!window)
    {
        //创建失败会返回NULL
        glfwTerminate();
    }
    glfwMakeContextCurrent(window);

    glfwSetKeyCallback(window, key_callback); //注册回调函数
    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);
        //结束一个画图步骤
        glEnd();

        glBegin(GL_POLYGON);
        //再画个梯形，需要注意笔顺
        glColor3f(0.5, 0.5, 0.5); //Grey
        glVertex2d(0.5, 0.5);
        glVertex2d(1, 1);
        glVertex2d(1, 0);
        glVertex2d(0.5, 0);
        glEnd();


        /******交换缓冲区，更新window上的内容******/
        glfwSwapBuffers(window);
    }
    glfwTerminate();
    return 0;
}