源.cpp

#include<glad/glad.h>
#include<glfw3.h>
#include<iostream>


void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
	glViewport(0, 0, width, height);
}

void ProcessInput(GLFWwindow* window){
	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
		glfwSetWindowShouldClose(window, 1);
	}
}
int main() {
	//glfw初始化，设置创建提示，来指定OPENGL的context主要版本和次版本，OPENGL的配置模式（核心模式）
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

	//创捷窗口
	GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
	if (window == NULL) {
		std::cout << "fail to create a window" << "\n";
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);
	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
	{
		std::cout << "Failed to initialize GLAD" << std::endl;
		return -1;
	}
	//顶点输入(x,y,z)
	float vertices[]={ 
	-0.5f, -0.5f, 0.0f,
	 0.5f, -0.5f, 0.0f,
	 0.0f,  0.5f, 0.0f
	};
	//我们可以使用glGenBuffers函数生成一个带有缓冲ID的VBO对象：
	unsigned int VBO;
	glGenBuffers(1, &VBO);

	//OpenGL有很多缓冲对象类型，顶点缓冲对象的缓冲类型是GL_ARRAY_BUFFER。
	// OpenGL允许我们同时绑定多个缓冲，只要它们是不同的缓冲类型。
	// 我们可以使用glBindBuffer函数把新创建的缓冲绑定到GL_ARRAY_BUFFER目标上：

	glBindBuffer(GL_ARRAY_BUFFER, VBO);
	//然后我们可以调用glBufferData函数，它会把之前定义的顶点数据复制到缓冲的内存中：
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);


	while (!glfwWindowShouldClose(window)) {
		ProcessInput(window);
		//render
		glad_glClearColor(0.1f, 0.2f, 0.2f, 0.1f);
		glClear(GL_COLOR_BUFFER_BIT);
		glfwSwapBuffers(window);
		glfwPollEvents();
	
	}
	glfwTerminate();
	return 0;	
}