open-gl-study
/
chapter9
/
square_9_3.cc

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

#include <iostream>

#include "shader.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow *window);

// 设置
const unsigned int SCR_WIDTH = 1280;
const unsigned int SCR_HEIGHT = 720;

float factor = 0.2f;

float deltaTime = 0.0f;  //两帧之间的间隔时间
float lastFrame = 0.0f;  //上一帧绘制的时间

glm::vec3 cameraPos = glm::vec3(0.0f, 0.0f, 4.0f);
glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);
glm::vec3 cameraUp = glm::vec3(0.0f, 1.0f, 0.0f);
//
//float vertices[] = {
//	//位置					// 颜色					//纹理
//	0.5f,	0.5f,	0.0f,	1.0f,	0.0f,	0.0f,	1.0f,	1.0f,	//
//	0.5f,	-0.5f,	0.0f,	0.0f,	1.0f,	0.0f,	1.0f,	0.0f,	//
//	-0.5f,	-0.5f,	0.0f,	0.0f,	0.0f,	1.0f,	0.0f,	0.0f,	//
//	-0.5f,	0.5f,	0.0f,	1.0f,	1.0f,	0.0f,	0.0f,	1.0f	//
//
//};
//
//unsigned int indices[] = {
//	0, 1, 3,		//
//	1, 2, 3			//
//};

float vertices[] = {
	-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
	0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
	0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
	0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
	-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
	-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,

	-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
	0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
	0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
	0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
	-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
	-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,

	-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
	-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
	-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
	-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
	-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
	-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,

	0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
	0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
	0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
	0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
	0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
	0.5f, 0.5f, 0.5f, 1.0f, 0.0f,

	-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
	0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
	0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
	0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
	-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
	-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,

	-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
	0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
	0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
	0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
	-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
	-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};

glm::vec3 cubePositions[] = {
	glm::vec3(0.0f, 0.0f, 0.0f),
	glm::vec3(2.0f, 5.0f, -15.0f),
	glm::vec3(-1.5f, -2.2f, -2.5f),
	glm::vec3(-3.8f, -2.0f, -12.3f),
	glm::vec3(2.4f, -0.4f, -3.5f),
	glm::vec3(-1.7f, 3.0f, -7.5f),
	glm::vec3(1.3f, -2.0f, -2.5f),
	glm::vec3(1.5f, 2.0f, -2.5f),
	glm::vec3(1.5f, 0.2f, -1.5f),
	glm::vec3(-1.3f, 1.0f, -1.5f)
};

int main() {
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

	GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
	if (window == NULL) {
		std::cout << "Failed to create GLFW window" << std::endl;
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);
	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
		std::cout << "Failed to initialize GLAD" << std::endl;
		return -1;
	}

	//获取最大属性数量
	int nrAttributes;
	glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &nrAttributes);
	std::cout << "max support nums:" << nrAttributes << std::endl;

	glEnable(GL_DEPTH_TEST);

	//创建我们的着色器
	Shader shader("Shader.vs", "Shader.fs");

	// 创建我们的着色器
	unsigned int VBO, VAO;
	glGenVertexArrays(1, &VAO);
	glBindVertexArray(VAO);

	glGenBuffers(1, &VBO);
	glBindBuffer(GL_ARRAY_BUFFER, VBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
	glEnableVertexAttribArray(1);

	//unsigned int EBO;
	//glGenBuffers(1, &EBO);
	//glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
	//glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

	//纹理1
	unsigned int texture;
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	//设置纹理包装和过滤的方式
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	int width, height, nrChannels;
	stbi_set_flip_vertically_on_load(true);
	unsigned char* data = stbi_load(/*"zhou_yu.bmp"*/"beauty.jpg", &width, &height, &nrChannels, 0);
	if (data) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
		glGenerateMipmap(GL_TEXTURE_2D);
	}
	else
		std::cout << "无法加载问题，请检查代码或资源是否有误。" << std::endl;
	stbi_image_free(data);

	//纹理2
	unsigned int texture2;
	glGenTextures(1, &texture2);
	glActiveTexture(GL_TEXTURE1);	//激活纹理1对象
	glBindTexture(GL_TEXTURE_2D, texture2);
	//设置纹理环绕和过滤的方式
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	//加载图片
	stbi_set_flip_vertically_on_load(true);
	unsigned char* data2 = stbi_load("awesomeface.png", &width, &height, &nrChannels, 0);
	if (data2) {
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data2);
		glGenerateMipmap(GL_TEXTURE_2D);
	}
	else
		std::cout << "无法加载问题，请检查代码或资源是否有误." << std::endl;
	stbi_image_free(data2);

	//告诉OpenGL哪个采样器属于哪个纹理单元
	shader.use();
	shader.setInt("texture1", 0);
	shader.setInt("texture2", 1);

	//变换
	//glm::mat4 trans;
	//trans = glm::scale(trans, glm::vec3(0.5f, 0.5f, 0.5f));
	//trans = glm::rotate(trans, /*glm::radians(90.0f)*/(float)glfwGetTime(), glm::vec3(0.0f, 0.0f, 1.0f));

	glm::mat4 view;
	view = glm::translate(view, glm::vec3(0.0f, 0.0f, -4.0f));

	glm::mat4 projection;
	projection = glm::perspective(glm::radians(45.0f), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);


	while (!glfwWindowShouldClose(window)) {
		processInput(window);

		glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, texture);
		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, texture2);

		shader.use();


		glm::mat4 view;
		float radius = 10.0f;
		float camX = sin(glfwGetTime()) * radius;
		float camZ = cos(glfwGetTime()) * radius;
		// view = glm::lookAt(glm::vec3(0.0f, 0.0f, 4.0f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
		// view = glm::lookAt(glm::vec3(camX, 0.0f, camZ), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
		view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);


		shader.setMat4("view", glm::value_ptr(view));
		shader.setMat4("projection", glm::value_ptr(projection));

		glBindVertexArray(VAO);
		for (int i = 0; i < 10; ++i) {
			glm::mat4 model;
			model = glm::translate(model, cubePositions[i]);
			float angle = 20.0f * i;
			model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
			shader.setMat4("model", glm::value_ptr(model));
			glDrawArrays(GL_TRIANGLES, 0, 36);
		}

		glfwSwapBuffers(window);
		glfwPollEvents();
	}

	glBindVertexArray(0);
	glDeleteVertexArrays(1, &VAO);
	glDeleteBuffers(1, &VBO);
	glfwTerminate();
	return 0;
}

void processInput(GLFWwindow *window) {
	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
		glfwSetWindowShouldClose(window, true);

	//if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS) {
	//	factor += 0.01f;
	//	if (factor > 1.0f)
	//		factor = 1.0f;
	//}

	//if (glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS) {
	//	factor -= 0.01f;
	//	if (factor < 0.0f)
	//		factor = 0.0f;
	//}
	float cameraSpeed = 0.05f; //移动速度
	if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
		cameraPos += cameraSpeed * cameraFront;

	if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
		cameraPos -= cameraSpeed * cameraFront;

	if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
		cameraPos -= glm::normalize(glm::cross(cameraFront, cameraUp) * cameraSpeed);

	if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
		cameraPos += glm::normalize(glm::cross(cameraFront, cameraUp) * cameraSpeed);

}

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