OpenGL第十一章多光源

这一章是对前面所学光线的总结

//MultipleLights
#include "Shader.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#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>void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void processInput(GLFWwindow* window);
glm::vec3 camera(glm::vec3(0.0f, 0.0f, 3.0f));
// settings
const unsigned int SCR_WIDTH = 800; //定义屏幕空间的大小
const unsigned int SCR_HEIGHT = 600;// camera
glm::vec3 cameraPos = glm::vec3(0.0f, 0.0f, 3.0f);
glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);
glm::vec3 cameraUp = glm::vec3(0.0f, 1.0f, 0.0f);bool firstMouse = true;
float yaw = -90.0f;    // 偏航初始化为-90.0度，因为偏航为0.0会导致指向右边的方向向量，所以我们最初向左旋转了一点。
float pitch = 0.0f; //初始化俯仰角
float lastX = 800.0f / 2.0;//为了把初始位置设置为屏幕中心所以取屏幕空间大小的一半
float lastY = 600.0 / 2.0;
float fov = 45.0f;//初始的视场角// timing
float deltaTime = 0.0f;    // time between current frame and last frame
float lastFrame = 0.0f;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
//glm::vec3 lightPos(1.2f, 1.0f, 2.0f);void processInput(GLFWwindow* window);glm::vec3 pointLightPositions[] = {glm::vec3(0.7f,  0.2f,  2.0f),glm::vec3(2.3f, -3.3f, -4.0f),glm::vec3(-4.0f,  2.0f, -12.0f),glm::vec3(0.0f,  0.0f, -3.0f)
};float vertices[] = {// positions          // normals           // texture coords-0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  0.0f,0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  0.0f,0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  1.0f,0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  1.0f,  1.0f,-0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  1.0f,-0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,  0.0f,  0.0f,-0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  0.0f,0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  0.0f,0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  1.0f,0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  1.0f,  1.0f,-0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  1.0f,-0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,  0.0f,  0.0f,-0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  0.0f,-0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  1.0f,-0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  1.0f,-0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  1.0f,-0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  0.0f,  0.0f,-0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,  1.0f,  0.0f,0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  0.0f,0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  1.0f,0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  1.0f,0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  1.0f,0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  0.0f,  0.0f,0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,  1.0f,  0.0f,-0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  1.0f,0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  1.0f,0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  0.0f,0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  1.0f,  0.0f,-0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  0.0f,-0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,  0.0f,  1.0f,-0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  1.0f,0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  1.0f,0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  0.0f,0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  1.0f,  0.0f,-0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  0.0f,-0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,  0.0f,  1.0f
};
//定义一个vec3类型的数组来存位移矩阵
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()
{//Glfw:初始化和配置// ------------------------------glfwInit();glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);#ifdef __APPLE__glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif//glfw窗口创建// --------------------GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);//使用定义的屏幕空间的大小if (window == NULL){std::cout << "Failed to create GLFW window" << std::endl;glfwTerminate();return -1;}glfwMakeContextCurrent(window);glfwSetCursorPosCallback(window, mouse_callback);glfwSetScrollCallback(window, scroll_callback);//首先我们要告诉GLFW，它应该隐藏光标，并捕捉(Capture)它。glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);//加载所有OpenGL函数指针// ---------------------------------------if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){std::cout << "Failed to initialize GLAD" << std::endl;return -1;}// 配置全局opengl状态// -----------------------------glEnable(GL_DEPTH_TEST);// 构建并编译我们的shader程序// ------------------------------------Shader ourShader("shaderSampler.vs", "shaderSampler.fs");Shader modelShader("MultipleLights.vs", "MultipleLights.fs");Shader lightShader("lightShader.vs", "lightShader.fs");//建立和编译顶点数据(和缓冲区)，配置顶点属性  // ------------------------------------------------------------------unsigned int VBO, VAO, VAO2;glGenVertexArrays(1, &VAO);glGenBuffers(1, &VBO);glBindBuffer(GL_ARRAY_BUFFER, VBO);glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);glBindVertexArray(VAO);//位置属性glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);glEnableVertexAttribArray(0);//之后在顶点着色器layout (location = 1) in vec3 aNormal;//告诉GPU位置1的属性glGenVertexArrays(1, &VAO2);glBindVertexArray(VAO2);//glBindBuffer(GL_ARRAY_BUFFER, VBO);//位置属性glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);glEnableVertexAttribArray(0);//法线属性glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));glEnableVertexAttribArray(1);glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));glEnableVertexAttribArray(2);// 加载并创建一个纹理// -------------------------unsigned int texture1, texture2;// texture 1// ---------glGenTextures(1, &texture1);glBindTexture(GL_TEXTURE_2D, texture1);// 设置纹理wrapping参数 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);// 设置纹理filtering参数 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);//加载图像，创建纹理和生成mipmaps  //多级原理纹理int width, height, nrChannels;stbi_set_flip_vertically_on_load(true); // 告诉stb_image.h在y轴上翻转已加载的纹理。//为什么需要翻转Y轴是因为纹理图片开始位置是右上而我们顶点的坐标（0，0）点是左下unsigned char* data = stbi_load("container2.png", &width, &height, &nrChannels, 0);if (data){glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);glGenerateMipmap(GL_TEXTURE_2D);}else{std::cout << "Failed to load texture" << std::endl;}stbi_image_free(data);// texture 2// ---------glGenTextures(1, &texture2);glBindTexture(GL_TEXTURE_2D, texture2);// 设置纹理wrapping参数glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);// 设置纹理filtering参数 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);// load image, create texture and generate mipmaps//data = stbi_load(("aotu.jpg"), &width, &height, &nrChannels, 0);//data = stbi_load(("shanshui.jpg"), &width, &height, &nrChannels, 0);data = stbi_load(("container2_specular.png"), &width, &height, &nrChannels, 0);if (data){//如果没有贴图请优先注意这个RGBA中的alpha(A)通道 如果你的贴图有alpha通道请务必使用RGBA模式否则无法显示贴图      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);glGenerateMipmap(GL_TEXTURE_2D);}else{std::cout << "Failed to load texture" << std::endl;}stbi_image_free(data);// 为每个采样器告诉opengl它属于哪个纹理单元(只需要做一次)  // -------------------------------------------------------------------------------------------modelShader.use();modelShader.setInt("material.diffuse", 0);modelShader.setInt("material.specular", 1);// ourShader.setVec3("lightPos", lightPos);//渲染循环// -----------while (!glfwWindowShouldClose(window)){float currentFrame = glfwGetTime();deltaTime = currentFrame - lastFrame;lastFrame = currentFrame;// -----processInput(window);// 渲染// ------glClearColor(0.2f, 0.3f, 0.3f, 1.0f);glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // 清除上一帧的颜色缓冲 以及 深度测试缓冲//激活着色器float angle = 20.0f * 0 * (float)glfwGetTime();//给一个glfwGetTime让模型旋转起来glm::mat4 projection = glm::mat4(1.0f);glm::mat4 view = glm::mat4(1.0f);glm::mat4 model = glm::mat4(1.0f);//glm::vec3 lightPos = glm::vec3(cubePositions[10]);//光源位置projection = glm::perspective(glm::radians(fov), 800.0f / 600.0f, 0.1f, 100.0f);//投影矩阵 参数：视口大小,屏幕宽高比，以及near和farview = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);//lookAt矩阵  参数：摄像机位置 ,观察目标的位置 ,竖直向上的方向model = glm::translate(model, cubePositions[0]);//把数组传进去给每一个新建的模型在世界坐标下有不同的位移model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));lightShader.use();lightShader.setMat4("model", model);//设置模型变换矩阵lightShader.setMat4("projection", projection);//设置投影变化矩阵lightShader.setMat4("view", view);//设置视图变化矩阵for (unsigned int i = 0; i < 4; i++){model = glm::mat4(1.0f);model = glm::translate(model, pointLightPositions[i]);model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cubelightShader.setMat4("model", model);glBindVertexArray(VAO);glDrawArrays(GL_TRIANGLES, 0, 36);}modelShader.use();//modelShader.use();//lightPos.x = 1.0f + sin(glfwGetTime()) * 2.0f;//lightPos.y = sin(glfwGetTime() / 2.0f) * 1.0f;model = glm::mat4(1.0f);model = glm::translate(model, cubePositions[0]);//把数组传进去给每一个新建的模型在世界坐标下有不同的位移angle = 20.0f * 1 * (float)glfwGetTime();//给一个glfwGetTime让模型旋转起来model = glm::rotate(model, glm::radians(angle) * 0, glm::vec3(1.0f, 0.5f, 0.5f));//rotate 模型位置 旋转角 旋转轴modelShader.setMat4("model", model);//设置模型变换矩阵modelShader.setMat4("projection", projection);//设置投影变化矩阵modelShader.setMat4("view", view);//设置视图变化矩阵modelShader.setVec3("objectColor", 1, 0.5, 0.5);//设置物体的颜色modelShader.setVec3("lightColor", 0.3, 1, 0.52);//设置光源的颜色当然也可以设置一个uniform来设置变量进行设置//modelShader.setVec3("lightPos", lightPos);//设置光源位置modelShader.setVec3("viewPos", cameraPos);//将相机的位置设置为观察位置//设置材质的每个uniform分量modelShader.setFloat("material.shininess", 32.0f);modelShader.setVec3("dirLight.direction", -0.2f, -1.0f, -0.3f);modelShader.setVec3("dirLight.ambient", 0.05f, 0.05f, 0.05f);modelShader.setVec3("dirLight.diffuse", 0.4f, 0.4f, 0.4f);modelShader.setVec3("dirLight.specular", 0.5f, 0.5f, 0.5f);// point light 1modelShader.setVec3("pointLights[0].position", pointLightPositions[0]);modelShader.setVec3("pointLights[0].ambient", 0.05f, 0.05f, 0.05f);modelShader.setVec3("pointLights[0].diffuse", 0.8f, 0.8f, 0.8f);modelShader.setVec3("pointLights[0].specular", 1.0f, 1.0f, 1.0f);modelShader.setFloat("pointLights[0].constant", 1.0f);modelShader.setFloat("pointLights[0].linear", 0.09f);modelShader.setFloat("pointLights[0].quadratic", 0.032f);// point light 2modelShader.setVec3("pointLights[1].position", pointLightPositions[1]);modelShader.setVec3("pointLights[1].ambient", 0.05f, 0.05f, 0.05f);modelShader.setVec3("pointLights[1].diffuse", 0.8f, 0.8f, 0.8f);modelShader.setVec3("pointLights[1].specular", 1.0f, 1.0f, 1.0f);modelShader.setFloat("pointLights[1].constant", 1.0f);modelShader.setFloat("pointLights[1].linear", 0.09f);modelShader.setFloat("pointLights[1].quadratic", 0.032f);// point light 3modelShader.setVec3("pointLights[2].position", pointLightPositions[2]);modelShader.setVec3("pointLights[2].ambient", 0.05f, 0.05f, 0.05f);modelShader.setVec3("pointLights[2].diffuse", 0.8f, 0.8f, 0.8f);modelShader.setVec3("pointLights[2].specular", 1.0f, 1.0f, 1.0f);modelShader.setFloat("pointLights[2].constant", 1.0f);modelShader.setFloat("pointLights[2].linear", 0.09f);modelShader.setFloat("pointLights[2].quadratic", 0.032f);// point light 4modelShader.setVec3("pointLights[3].position", pointLightPositions[3]);modelShader.setVec3("pointLights[3].ambient", 0.05f, 0.05f, 0.05f);modelShader.setVec3("pointLights[3].diffuse", 0.8f, 0.8f, 0.8f);modelShader.setVec3("pointLights[3].specular", 1.0f, 1.0f, 1.0f);modelShader.setFloat("pointLights[3].constant", 1.0f);modelShader.setFloat("pointLights[3].linear", 0.09f);modelShader.setFloat("pointLights[3].quadratic", 0.032f);modelShader.setVec3("spotLight.position", 0.0f, 0.0f, -1.0f);modelShader.setVec3("spotLight.direction", 0.0f, 0.0f, 5.0f);modelShader.setVec3("spotLight.ambient", 0.0f, 0.0f, 0.0f);modelShader.setVec3("spotLight.diffuse", 1.0f, 1.0f, 1.0f);modelShader.setVec3("spotLight.specular", 1.0f, 1.0f, 1.0f);modelShader.setFloat("spotLight.constant", 1.0f);modelShader.setFloat("spotLight.linear", 0.09f);modelShader.setFloat("spotLight.quadratic", 0.032f);modelShader.setFloat("spotLight.cutOff", glm::cos(glm::radians(12.5f)));modelShader.setFloat("spotLight.outerCutOff", glm::cos(glm::radians(15.0f)));//激活纹理glActiveTexture(GL_TEXTURE0);glBindTexture(GL_TEXTURE_2D, texture1);glActiveTexture(GL_TEXTURE1);glBindTexture(GL_TEXTURE_2D, texture2);for (unsigned 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));modelShader.setMat4("model", model);glBindVertexArray(VAO2);glDrawArrays(GL_TRIANGLES, 0, 36);}glfwSwapBuffers(window);glfwPollEvents();}glDeleteVertexArrays(1, &VAO);glDeleteBuffers(1, &VBO);glfwTerminate();return 0;
}void processInput(GLFWwindow* window)
{if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)glfwSetWindowShouldClose(window, true);float cameraSpeed = 5.5f * deltaTime;; // adjust accordinglyif (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;if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)//这里给了一个空格键使我们可以在Y轴上移动cameraPos += cameraUp * cameraSpeed;//cameraPos.y = 0.0f;//可以通过把Y方向上的向量设置为0来使他成为一个FPS类型的摄像机只能在XZ平面上移动}void mouse_callback(GLFWwindow* window, double xposIn, double yposIn)
{float xpos = static_cast<float>(xposIn);float ypos = static_cast<float>(yposIn);// 这个bool变量初始时是设定为true的//我们在一开始的时候需要把他设为屏幕的中心点//如果不这样干 程序一开始就会调用回调函数指向你鼠标进去的时候所在屏幕的位置//这样就离中心点很远了if (firstMouse){lastX = xpos;lastY = ypos;firstMouse = false;}//然后在鼠标的回调函数中我们计算当前帧和上一帧鼠标位置的偏移量：float xoffset = xpos - lastX;float yoffset = lastY - ypos; // y坐标是从下到上  lastX = xpos;lastY = ypos;float sensitivity = 0.1f; // sensitivity这个值可以随便设置xoffset *= sensitivity;yoffset *= sensitivity;yaw += xoffset;pitch += yoffset;// 为了保证摄像机不会整个翻车if (pitch > 89.0f)pitch = 89.0f;if (pitch < -89.0f)pitch = -89.0f;//在xz平面上看向Y轴//这里我们只更新了y值，仔细观察x和z分量也被影响了。从三角形中我们可以看到它们的值等于：//direction.x = cos(glm::radians(pitch));//direction.y = sin(glm::radians(pitch)); // 注意我们先把角度转为弧度//direction.z = cos(glm::radians(pitch));//这里Y轴更新确实会影响到Z轴但是不是很懂为什么直接等于cos(pitch)// //////这里我们只更新了y值，仔细观察x和z分量也被影响了。从三角形中我们可以看到它们的值等于：//direction.x = cos(glm::radians(yaw));//direction.y =1 // Y不变//direction.z = sin(glm::radians(yaw));// //下面的等式相当于是先俯仰角的旋转变换完成之后再乘以这个偏航角//把上面两步合起来glm::vec3 front;front.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));front.y = sin(glm::radians(pitch));front.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));cameraFront = glm::normalize(front);
}// glfw: whenever the mouse scroll wheel scrolls, this callback is called
// ----------------------------------------------------------------------
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{//yoffset就是我们滚轮竖直滚动的方向if (fov >= 1.0f && fov <= 45.0f)fov -= yoffset;//为他设定一个边界 在1到45之间if (fov < 1.0f)fov = 1.0f;if (fov > 45.0f)fov = 45.0f;
}

//MultipleLights.fs
#version 330 core
out vec4 FragColor;struct Material {sampler2D diffuse;sampler2D specular;float shininess;
}; struct DirLight {vec3 direction;vec3 ambient;vec3 diffuse;vec3 specular;
};struct PointLight {vec3 position;float constant;float linear;float quadratic;vec3 ambient;vec3 diffuse;vec3 specular;
};struct SpotLight {vec3 position;vec3 direction;float cutOff;float outerCutOff;float constant;float linear;float quadratic;vec3 ambient;vec3 diffuse;vec3 specular;
};#define NR_POINT_LIGHTS 4in vec3 FragPos;
in vec3 Normal;
in vec2 TexCoords;uniform vec3 viewPos;
uniform DirLight dirLight;
uniform PointLight pointLights[NR_POINT_LIGHTS];
uniform SpotLight spotLight;
uniform Material material;// function prototypes
vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir);
vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir);
vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir);
void main()
{vec3 norm = normalize(Normal);vec3 viewDir = normalize(viewPos - FragPos);// == =====================================================// Our lighting is set up in 3 phases: directional, point lights and an optional flashlight// For each phase, a calculate function is defined that calculates the corresponding color// per lamp. In the main() function we take all the calculated colors and sum them up for// this fragment's final color.// == =====================================================// phase 1: directional lightingvec3 result = CalcDirLight(dirLight, norm, viewDir);// phase 2: point lightsfor(int i = 0; i < NR_POINT_LIGHTS; i++)result += CalcPointLight(pointLights[i], norm, FragPos, viewDir);    // phase 3: spot lightresult += CalcSpotLight(spotLight, norm, FragPos, viewDir);    FragColor = vec4(result, 1.0);
}vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir)
{vec3 lightDir = normalize(-light.direction);// 漫反射着色float diff = max(dot(normal, lightDir), 0.0);// 镜面光着色vec3 reflectDir = reflect(-lightDir, normal);float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);// 合并结果vec3 ambient  = light.ambient  * vec3(texture(material.diffuse, TexCoords));vec3 diffuse  = light.diffuse  * diff * vec3(texture(material.diffuse, TexCoords));vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));return (ambient + diffuse + specular);
}
vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
{vec3 lightDir = normalize(light.position - fragPos);// 漫反射着色float diff = max(dot(normal, lightDir), 0.0);// 镜面光着色vec3 reflectDir = reflect(-lightDir, normal);float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);// 衰减float distance    = length(light.position - fragPos);float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    // 合并结果vec3 ambient  = light.ambient  * vec3(texture(material.diffuse, TexCoords));vec3 diffuse  = light.diffuse  * diff * vec3(texture(material.diffuse, TexCoords));vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));ambient  *= attenuation;diffuse  *= attenuation;specular *= attenuation;return (ambient + diffuse + specular);
}
vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
{vec3 lightDir = normalize(light.position - fragPos);// diffuse shadingfloat diff = max(dot(normal, lightDir), 0.0);// specular shadingvec3 reflectDir = reflect(-lightDir, normal);float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);// attenuationfloat distance = length(light.position - fragPos);float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    // spotlight intensityfloat theta = dot(lightDir, normalize(-light.direction)); float epsilon = light.cutOff - light.outerCutOff;float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);// combine resultsvec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));ambient *= attenuation * intensity;diffuse *= attenuation * intensity;specular *= attenuation * intensity;return (ambient + diffuse + specular);
}

//MultipleLights.vs
#version 330 core
layout (location = 0) in vec3 aPos;//初始位置为0的属性为顶点位置
layout (location = 1) in vec3 aNormal;//初始位置为1的属性为法线位置
layout (location = 2) in vec2 aTexCoords;//初始位置为2的属性为贴图坐标out vec3 FragPos;//输出物体的位置
out vec3 Normal;//输出法线
out vec2 TexCoords;//输出贴图uniform mat4 model;//定义全局变量model 在主函数中设置
uniform mat4 view;//定义全局变量view 在主函数中设置
uniform mat4 projection;//定义全局变量projection 在主函数中设置void main()
{FragPos = vec3(model * vec4(aPos, 1.0));//物体经过模型变换后在世界坐标的位置Normal = mat3(transpose(inverse(model))) * aNormal;//法线变换矩阵=逆矩阵的转置*法线矩阵TexCoords = aTexCoords;//贴图坐标gl_Position = projection * view * vec4(FragPos, 1.0);//最后在视锥里面你看到的位置
}

//lightShader.fs
#version 330 core
out vec4 FragColor;void main()
{FragColor = vec4(1.0);}

//lightShader.vs
#version 330 core
layout (location = 0) in vec3 aPos;uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;void main()
{gl_Position = projection * view * model * vec4(aPos, 1.0);
}

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