glfw的接口程序

在ubutun上测试OpenGL使用glfw窗口，发现编译时找的库是-lglfw而不是-lglfw3，这一点还存疑。

代码来自于OpenGL五十弦翻译过来的OpenGL教程。

//g++ testGLFW.c -g -o testGLFW.out -lGLEW -lGL -lglfw

#include <stdio.h>
#include <GL/glew.h>
#include <GL/gl.h>
#include <GLFW/glfw3.h>


void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);


// Window dimensions
const GLuint WIDTH = 800, HEIGHT = 600;


int main()
{
    printf("Starting GLFW context, OpenGL 3.3!\n");
    glfwInit();
    
    //set openGL 3.3 and core profile
    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);
    
    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "Hello World", NULL, NULL);   
    
    if (window == NULL)
    {
        printf("Failed to create GLFW window\n");
        glfwTerminate();
        return -1;
    }   


    glfwMakeContextCurrent(window);
    glfwSetKeyCallback(window, key_callback);  


    glewExperimental = GL_TRUE;
    if (glewInit() != GLEW_OK)
    {
        printf("Failed to initialize GLEW\n");
        return -1;
    }  
    // Define the viewport dimensions
    int width, height;
    glfwGetFramebufferSize(window, &width, &height);  
    glViewport(0, 0, width, height);


    // Game loop
    while (!glfwWindowShouldClose(window))
    {
        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
        glfwPollEvents();


        // Render
        // Clear the colorbuffer
        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);


        // Swap the screen buffers
        glfwSwapBuffers(window);
    }


    // Terminate GLFW, clearing any resources allocated by GLFW.
    glfwTerminate();
    return 0;    
}


void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
    //std::cout << key << std::endl;
    printf("%d\n",key);
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
        glfwSetWindowShouldClose(window, GL_TRUE);
}