OpenGL-Shadow.zip

/*** * Task11 阴影 (如VS版本不同，则右击项目->属性->常规->平台工具集，选中自己的VS版本即可) * 步骤: * 1-初始化: GLFW窗口，GLAD。 * 2-帧缓冲: 生成深度贴图，进行光空间变换。 * 3-数据处理: 给定顶点数据，生成并绑定VAO&VBO(准备在GPU中进行处理)，设置顶点属性指针(本质上就是告诉OpenGL如何处理数据)。 * 4-载入纹理: 通过stb_image图像库加载图像。 * 5-光源: 设置了平行光。 * 6-着色器: 给出立方体和阴影贴图的着色器，然后在Shader类中分别链接为着色器程序，渲染时使用着色器程序。 * 7-摄像机: 计算出每帧的间隔时间，以及摄像机的摆放位置。 * 8-渲染: 计算间隔时间，输入控制，渲染阴影深度贴图，清空缓冲，开启光源，绑定纹理，绘制立方体，交换缓冲区检查触发事件后释放资源。 */ #include <iostream> #define STB_IMAGE_IMPLEMENTATION #include <stb/stb_image.h> #include <glad/glad.h> #include <GLFW/glfw3.h> #include "Shader.h" #include "Model.h" #include "Camera.h" #include "Texture.h" //鼠标键盘响应函数 void framebuffer_size_callback(GLFWwindow* window, int width, int height); void mouse_callback(GLFWwindow* window, double xpos, double ypos); void scroll_callback(GLFWwindow* window, double xoffset, double yoffset); void processInput(GLFWwindow *window); float screen_width = 1280.0f; //窗口宽度 float screen_height = 720.0f; //窗口高度 //摄像机相关参数 Camera camera(glm::vec3(-2.0f, 3.5f, 4.0f), glm::vec3(0, 1, 0), -60, -45); float lastX = screen_width / 2.0f; float lastY = screen_height / 2.0f; bool firstMouse = true; GLfloat near_plane = 1.0f, far_plane = 7.5f; // 视锥的远近平面 const GLuint SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024; // 深度贴图的分辨率 float deltaTime = 0.0f; float lastFrame = 0.0f; glm::vec3 lightPos(-3.0f, 4.0f, -1.0f); unsigned int cube_vbo, cube_vao; unsigned int plane_vbo, plane_vao; void DrawScene(Shader shader, float current_frame, unsigned int textureID1, unsigned int textureID2);//绘制整个场景 void renderQuad();//绘制铺满整个屏幕的四边形，用于检测 int main() { // 初始化GLFW glfwInit(); // 初始化GLFW glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // OpenGL版本为3.3，主次版本号均设为3 glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // 使用核心模式(无需向后兼容性) glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // 如果使用的是Mac OS X系统，需加上这行 glfwWindowHint(GLFW_RESIZABLE, FALSE); // 不可改变窗口大小 // 创建窗口(宽、高、窗口名称) auto window = glfwCreateWindow(screen_width, screen_height, "shadow", nullptr, nullptr); if (window == nullptr) { std::cout << "Failed to Create OpenGL Context" << std::endl; glfwTerminate(); return -1; } glfwMakeContextCurrent(window); glfwSetFramebufferSizeCallback(window, framebuffer_size_callback); glfwSetCursorPosCallback(window, mouse_callback); glfwSetScrollCallback(window, scroll_callback); glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED); // 初始化GLAD，加载OpenGL函数指针地址的函数 if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) { std::cout << "Failed to initialize GLAD" << std::endl; return -1; } // 设置离屏渲染帧缓冲(生成深度贴图) GLuint depthMapFBO; glGenFramebuffers(1, &depthMapFBO); GLuint depthMap; glGenTextures(1, &depthMap); glBindTexture(GL_TEXTURE_2D, depthMap); glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL); //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_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); //解决采样越界 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER); float borderColor[] = { 1.0, 1.0, 1.0, 1.0 }; glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor); glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0); glDrawBuffer(GL_NONE); glReadBuffer(GL_NONE); glBindFramebuffer(GL_FRAMEBUFFER, 0); // 指定当前视口尺寸(前两个参数为左下角位置，后两个参数是渲染窗口宽、高) glViewport(0, 0, screen_width, screen_height); // 着色器(立方体和阴影贴图) Shader cube_shader = Shader("res/shader/DrawScene.vs", "res/shader/DrawScene.fs"); Shader shadowMap_shader = Shader("res/shader/ShadowMap.vs", "res/shader/ShadowMap.fs"); Shader debugQuad = Shader("res/shader/debugDepthQuad.vs", "res/shader/debugDepthQuad.fs"); // 正方体&&地板数据s float cubeVertices[] = { // ---- 位置 ---- ---- 法线 ---- - 纹理坐标 - -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.5f, 0.5f, 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.5f, 0.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.5f, 0.5f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.5f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.5f, 0.5f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.5f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.5f, 0.0f, -1.0f, 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.5f, 0.5f, -1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.5f, -1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.5f, -1.0f, -1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.5f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.5f, 0.0f, 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.5f, 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.5f, 0.5f, 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.5f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.5f, 0.0f, 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, -1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.5f, 1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.5f, 0.5f, 1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.5f, 0.0f, 1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.5f, 0.0f, -1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, -1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.5f, -1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.5f, 1.0f, 1.0f , 1.0f, 0.0f, 1.0f, 0.0f, 0.5f, 0.0f, 1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.5f, 0.0f, -1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.5f, -1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f }; float planeVertices[] = { 5.0f, -0.5f, 5.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, -5.0f, -0.5f, 5.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, -5.0f, -0.5f, -5.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 5.0f, -0.5f, 5.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, -5.0f, -0.5f, -5.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 5.0f, -0.5f, -5.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f }; // ---------------------绑定顶点数组对象---------------------- glGenVertexArrays(1, &cube_vao); glGenBuffers(1, &cube_vbo); glBindBuffer(GL_ARRAY_BUFFER, cube_vbo); glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), cubeVertices, GL_STATIC_DRAW); glBindVertexArray(cube_vao); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0); glEnableVertexAttribArray(0); 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); glGenVertexArrays(1, &plane_vao); glGenBuffers(1, &plane_vbo); glBindBuffer(GL_ARRAY_BUFFER, plane_vbo); glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), planeVertices, GL_STATIC_DRAW); glBindVertexArray