#define GLEW_STATIC

#include <iostream>

#include <GL/glew.h>

#include <GLFW/glfw3.h>

void EscInput(GLFWwindow *win);

float vertices[]={

-0.5f,-0.5f,0.0f,

0.5f,-0.5f,0.0f,

0.0f, 0.5f,0.0f

};

const char *vertexShaderSource =

"#version 330 core\n"

"layout (location = 0) in vec3 aPos;\n"

"void main()\n"

"{\n"

" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"

"}\n";

const char *fragmentShaderSource=

"#version 330 core\n"

"out vec4 FragColor;\n"

"void main()\n"

"{\n"

" FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"

"}\n";

int main(){

glfwInit(); //初始化

glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR,3);//提示1：用主版本

glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR,3);//提示2：用子版本

glfwWindowHint(GLFW_OPENGL_PROFILE,GLFW_OPENGL_CORE_PROFILE);//提示3：使用啥

/*glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT,GL_TRUE);*/ //提示4：使用mac兼容

//new一個(gè) GLFWwindow 對(duì)象 并設(shè)置w,h,"title_text",null,null

GLFWwindow *win = glfwCreateWindow(800,600,"Test window",NULL,NULL);

if(win == NULL){

std::cout<<"Open Window Failed\n";

glfwTerminate();

return -1;//失敗則結(jié)束

}

glfwMakeContextCurrent(win);

//=============================

glewExperimental = true;//bool

if(glewInit()!= GLEW_OK){

std::cout<<"glew init failed\n";

glfwTerminate();

return -1;

}

glViewport(0,0,800,600);//設(shè)置窗口維度(屏幕x,屏幕y,窗口x,窗口y)貌似沒(méi)鳥(niǎo)用

unsigned int VAO;

glGenVertexArrays(1,&VAO);

glBindVertexArray(VAO);

unsigned int VBO;

glGenBuffers(1,&VBO);

glBindBuffer(GL_ARRAY_BUFFER,VBO);

glBufferData(GL_ARRAY_BUFFER,sizeof(vertices),vertices,GL_STATIC_DRAW);

unsigned int vertexShader;

vertexShader = glCreateShader(GL_VERTEX_SHADER);

glShaderSource(vertexShader,1,&vertexShaderSource,NULL);

glCompileShader(vertexShader);

unsigned int fragmentShader;

fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);

glShaderSource(fragmentShader,1,&fragmentShaderSource,NULL);

glCompileShader(fragmentShader);

unsigned int shaderProgram;

shaderProgram = glCreateProgram();

glAttachShader(shaderProgram,vertexShader);

glAttachShader(shaderProgram,fragmentShader);

glLinkProgram(shaderProgram);

glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,3*sizeof(float),(void*)0);

glEnableVertexAttribArray(0);

while(!glfwWindowShouldClose(win)){ //循環(huán)渲染 (每幀[30/60/120])

glClearColor(0.1137254901960784,0.85,1,1.0); //設(shè)置顏色

glClear(GL_COLOR_BUFFER_BIT);

//自定義函數(shù)

EscInput(win);

//繪制三角形

glBindVertexArray(VAO);

glUseProgram(shaderProgram);

glDrawArrays(GL_TRIANGLES,0,3);

glfwSwapBuffers(win); //顏色繪制與輸出2D屏幕

glfwPollEvents();

}

glfwTerminate(); //釋放/刪除之前的資源

return 0;

}

//當(dāng)按下ESC時(shí)，退出

void EscInput(GLFWwindow *win){

if(glfwGetKey(win,GLFW_KEY_ESCAPE)==GLFW_PRESS){

std::cout<<"eixt!\n";

glfwSetWindowShouldClose(win,1);

}

}