main.cpp代码
#include <iostream>
#include "glad/glad.h"
#include "GLFW/glfw3.h"
void framebuffer_size_callback(GLFWwindow *window, int width, int height);
void processInput(GLFWwindow *window);
int main() {
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_OPENGL_CORE_PROFILE);
//第三个参数是标题
GLFWwindow *window = glfwCreateWindow(800, 600, "LearnOpengl", NULL, NULL);
if (window == NULL) {
std::cout << "Fail to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
//奇特的写法,本应是个函数,写出来却像个变量,连参数都不需要传了
if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
std::cout << "File to initialize GLAD" << std::endl;
return -1;
}
glViewport(0, 0, 800, 600);//指定视口大小,跟java一样
//设置窗口尺寸改变的回调,C++原来是直接把一个函数作为回调传进去
//原来它们的函数名是可以直接使用的,也解释了上面的现象
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
//循环绘制
while (!glfwWindowShouldClose(window)) {//判断界面是否关闭,没关闭就循环绘制
processInput(window);
//双缓冲机制,前缓冲保存着最终输出的图像,后缓冲则进行绘制,绘制完成以后与前缓冲交换,就会立即显示
//单缓冲会存在闪烁问题
glfwSwapBuffers(window);//交换颜色缓冲
glfwPollEvents();//检查有没有什么触发事件,鼠标键盘等
//同java
glClearColor(0.2f,0.3f,0.3f,1.0f);
glClear(GL_COLOR_BUFFER_BIT);
}
glfwTerminate();//绘制
return 0;
}
//窗口尺寸改变的回调
void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
glViewport(0, 0, width, height);
}
void processInput(GLFWwindow *window) {
//按下esc键的意思
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
glfwSetWindowShouldClose(window, true);//关闭窗户
}
}
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