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window.cpp
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window.cpp
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
// 窗口大小回调函数
void framebuffer_size_callback(GLFWwindow *, int, int);
//用户输入
void processInput(GLFWwindow *);
//渲染循环
void render_loop(GLFWwindow *);
//glfw初始化
void glfw_init();
//检测窗口
int check_window(GLFWwindow *);
// 加载glad
int load_opengl_fun_ptr();
// 定义屏幕宽和高
const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;
int main() {
// 初始化glfw库
glfw_init();
//MacOS
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
// 创建窗口
GLFWwindow *window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "第一个窗口", NULL, NULL);
// 检测窗口
check_window(window);
// 设置当前窗口context为主线程
glfwMakeContextCurrent(window);
// 设置窗口大小
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// 加载opengl函数指针
load_opengl_fun_ptr();
// 渲染循环
render_loop(window);
// 清除glfw资源
glfwTerminate();
return 0;
}
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
void processInput(GLFWwindow *window) {
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
}
// glfw: whenever the window size changed (by OS or user resize) this callback function executes
void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
// make sure the viewport matches the new window dimensions; note that width and
// height will be significantly larger than specified on retina displays.
glViewport(0, 0, width, height);
}
void render_loop(GLFWwindow *window) {
while (!glfwWindowShouldClose(window)) {
// input
processInput(window);
// render
glClearColor(0.6f, 0.7f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// glfw: swap buffers and poll IO events
// 双缓冲
glfwSwapBuffers(window);
glfwPollEvents();
}
}
void glfw_init() {
// glfw初始化
glfwInit();
// glfw主版本号
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
// glfw次版本号
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
// 使用glfw核心模式
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
}
int check_window(GLFWwindow *window) {
if (window == NULL) {
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
return 0;
}
// glad: load all OpenGL function pointers
int load_opengl_fun_ptr() {
if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
return 0;
}