#include <iostream>

// GLEW

#define GLEW_STATIC

#include <GL/glew.h>

#include <Windows.h>

// GLFW

#include <GLFW/glfw3.h>

#pragma comment(lib,"winmm.lib") // 告诉连接器与这个库连接，因为我们要播放多媒体声音

#pragma comment(linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"" )

//#define DEBUG

// Function prototypes

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

// Window dimensions

const GLuint WIDTH = , HEIGHT = ;

// The MAIN function, from here we start the application and run the game loop

//#ifdef DEBUG

//int main()

//#else

//int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)

//#endif

int main()

{

    std::cout << "Starting GLFW context, OpenGL 3.3" << std::endl;

    // Init GLFW

    glfwInit();

    // Set all the required options for GLFW

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, );

    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, );

    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

    // Create a GLFWwindow object that we can use for GLFW's functions

    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT,"墨迹",nullptr, nullptr);

    if (window == nullptr)

    {

        std::cout << "Failed to create GLFW window" << std::endl;

        glfwTerminate();

        return -;

    }

    glfwMakeContextCurrent(window);

    // Set the required callback functions

    glfwSetKeyCallback(window, key_callback);

    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions

    glewExperimental = GL_TRUE;

    // Initialize GLEW to setup the OpenGL Function pointers

    if (glewInit() != GLEW_OK)

    {

        std::cout << "Failed to initialize GLEW" << std::endl;

        return -;

    }

    // Define the viewport dimensions

    glViewport(, , 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);

        Sleep();

    }

    // Terminate GLFW, clearing any resources allocated by GLFW.

    glfwTerminate();

    return ;

}

// Is called whenever a key is pressed/released via GLFW

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

{

    std::cout << key << std::endl;

    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)

        glfwSetWindowShouldClose(window, GL_TRUE);

}