mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-02 04:37:54 +08:00
Code re-work: shadow mapping.
This commit is contained in:
Joey de Vries
@@ -1,131 +1,128 @@
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// GLEW
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#define GLEW_STATIC
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#include <GL/glew.h>
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// GLFW
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <stb_image.h>
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// GL includes
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#include <learnopengl/shader.h>
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#include <learnopengl/camera.h>
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// GLM Mathemtics
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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// Other Libs
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#include <SOIL.h>
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#include <learnopengl/filesystem.h>
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#include <learnopengl/shader.h>
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#include <learnopengl/camera.h>
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#include <learnopengl/model.h>
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// Properties
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const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
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#include <iostream>
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// Function prototypes
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void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void framebuffer_size_callback(GLFWwindow* window, int width, int height);
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void mouse_callback(GLFWwindow* window, double xpos, double ypos);
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void Do_Movement();
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GLuint loadTexture(GLchar const * path);
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void RenderScene(Shader &shader);
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void RenderCube();
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void RenderQuad();
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void processInput(GLFWwindow *window);
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unsigned int loadTexture(const char *path);
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void renderScene(const Shader &shader);
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void renderCube();
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void renderQuad();
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// Camera
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// settings
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const unsigned int SCR_WIDTH = 1280;
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const unsigned int SCR_HEIGHT = 720;
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// camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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float lastX = (float)SCR_WIDTH / 2.0;
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float lastY = (float)SCR_HEIGHT / 2.0;
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bool firstMouse = true;
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// Delta
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GLfloat deltaTime = 0.0f;
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GLfloat lastFrame = 0.0f;
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// timing
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float deltaTime = 0.0f;
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float lastFrame = 0.0f;
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// Options
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GLboolean shadows = true;
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// meshes
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unsigned int planeVAO;
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// Global variables
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GLuint woodTexture;
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GLuint planeVAO;
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// The MAIN function, from here we start our application and run our Game loop
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int main()
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{
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// Init GLFW
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// glfw: initialize and configure
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// ------------------------------
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
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GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
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// glfw window creation
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// --------------------
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GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
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glfwMakeContextCurrent(window);
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// Set the required callback functions
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glfwSetKeyCallback(window, key_callback);
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if (window == NULL)
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{
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std::cout << "Failed to create GLFW window" << std::endl;
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glfwTerminate();
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return -1;
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}
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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// Options
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// tell GLFW to capture our mouse
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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// Initialize GLEW to setup the OpenGL Function pointers
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glewExperimental = GL_TRUE;
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glewInit();
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// glad: load all OpenGL function pointers
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// ---------------------------------------
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
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{
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std::cout << "Failed to initialize GLAD" << std::endl;
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return -1;
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}
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// Define the viewport dimensions
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glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
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// Setup some OpenGL options
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// configure global opengl state
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// -----------------------------
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glEnable(GL_DEPTH_TEST);
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// Setup and compile our shaders
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Shader shader("shadow_mapping.vs", "shadow_mapping.frag");
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Shader simpleDepthShader("shadow_mapping_depth.vs", "shadow_mapping_depth.frag");
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Shader debugDepthQuad("debug_quad.vs", "debug_quad_depth.frag");
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// build and compile shaders
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// -------------------------
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Shader shader("3.1.3.shadow_mapping.vs", "3.1.3.shadow_mapping.fs");
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Shader simpleDepthShader("3.1.1.shadow_mapping_depth.vs", "3.1.1.shadow_mapping_depth.fs");
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Shader debugDepthQuad("3.1.1.debug_quad.vs", "3.1.1.debug_quad_depth.fs");
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// Set texture samples
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shader.Use();
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glUniform1i(glGetUniformLocation(shader.Program, "diffuseTexture"), 0);
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glUniform1i(glGetUniformLocation(shader.Program, "shadowMap"), 1);
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// set up vertex data (and buffer(s)) and configure vertex attributes
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// ------------------------------------------------------------------
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float planeVertices[] = {
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// positions // normals // texcoords
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25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
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-25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
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-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f,
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GLfloat planeVertices[] = {
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// Positions // Normals // Texture Coords
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25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
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-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f,
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-25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
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25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
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25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 25.0f,
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-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f
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25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
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-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f,
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25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 25.0f
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};
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// Setup plane VAO
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GLuint planeVBO;
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// plane VAO
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unsigned int planeVBO;
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glGenVertexArrays(1, &planeVAO);
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glGenBuffers(1, &planeVBO);
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glBindVertexArray(planeVAO);
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glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), &planeVertices, GL_STATIC_DRAW);
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glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), planeVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
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glBindVertexArray(0);
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// Light source
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glm::vec3 lightPos(-2.0f, 4.0f, -1.0f);
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// load textures
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// -------------
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unsigned int woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
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// Load textures
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woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
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// Configure depth map FBO
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const GLuint SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
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GLuint depthMapFBO;
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// configure depth map FBO
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// -----------------------
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const unsigned int SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
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unsigned int depthMapFBO;
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glGenFramebuffers(1, &depthMapFBO);
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// - Create depth texture
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GLuint depthMap;
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// create depth texture
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unsigned int depthMap;
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glGenTextures(1, &depthMap);
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glBindTexture(GL_TEXTURE_2D, depthMap);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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@@ -133,284 +130,283 @@ int main()
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
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GLfloat borderColor[] = { 1.0, 1.0, 1.0, 1.0 };
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
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// attach depth texture as FBO's depth buffer
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glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
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glDrawBuffer(GL_NONE);
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glReadBuffer(GL_NONE);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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// Game loop
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// shader configuration
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// --------------------
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shader.use();
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shader.setInt("diffuseTexture", 0);
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shader.setInt("shadowMap", 1);
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debugDepthQuad.use();
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debugDepthQuad.setInt("depthMap", 0);
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// lighting info
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// -------------
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glm::vec3 lightPos(-2.0f, 4.0f, -1.0f);
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// render loop
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// -----------
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while (!glfwWindowShouldClose(window))
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{
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// Set frame time
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GLfloat currentFrame = glfwGetTime();
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// per-frame time logic
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// --------------------
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// Check and call events
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glfwPollEvents();
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Do_Movement();
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// input
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// -----
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processInput(window);
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// Change light position over time
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lightPos.z = cos(glfwGetTime()) * 2.0f;
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// change light position over time
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//lightPos.x = sin(glfwGetTime()) * 3.0f;
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//lightPos.z = cos(glfwGetTime()) * 2.0f;
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//lightPos.y = 5.0 + cos(glfwGetTime()) * 1.0f;
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// 1. Render depth of scene to texture (from light's perspective)
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// - Get light projection/view matrix.
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// render
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// ------
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// 1. render depth of scene to texture (from light's perspective)
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// --------------------------------------------------------------
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glm::mat4 lightProjection, lightView;
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glm::mat4 lightSpaceMatrix;
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GLfloat near_plane = 1.0f, far_plane = 7.5f;
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float near_plane = 1.0f, far_plane = 7.5f;
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//lightProjection = glm::perspective(glm::radians(45.0f), (GLfloat)SHADOW_WIDTH / (GLfloat)SHADOW_HEIGHT, near_plane, far_plane); // note that if you use a perspective projection matrix you'll have to change the light position as the current light position isn't enough to reflect the whole scene
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lightProjection = glm::ortho(-10.0f, 10.0f, -10.0f, 10.0f, near_plane, far_plane);
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//lightProjection = glm::perspective(45.0f, (GLfloat)SHADOW_WIDTH / (GLfloat)SHADOW_HEIGHT, near_plane, far_plane); // Note that if you use a perspective projection matrix you'll have to change the light position as the current light position isn't enough to reflect the whole scene.
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lightView = glm::lookAt(lightPos, glm::vec3(0.0f), glm::vec3(0.0, 1.0, 0.0));
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lightSpaceMatrix = lightProjection * lightView;
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// - now render scene from light's point of view
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simpleDepthShader.Use();
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glUniformMatrix4fv(glGetUniformLocation(simpleDepthShader.Program, "lightSpaceMatrix"), 1, GL_FALSE, glm::value_ptr(lightSpaceMatrix));
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// render scene from light's point of view
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simpleDepthShader.use();
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simpleDepthShader.setMat4("lightSpaceMatrix", lightSpaceMatrix);
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glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
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glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
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glClear(GL_DEPTH_BUFFER_BIT);
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RenderScene(simpleDepthShader);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, woodTexture);
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renderScene(simpleDepthShader);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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// 2. Render scene as normal
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// reset viewport
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glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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shader.Use();
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// 2. render scene as normal using the generated depth/shadow map
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// --------------------------------------------------------------
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glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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shader.use();
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glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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glm::mat4 view = camera.GetViewMatrix();
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
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// Set light uniforms
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glUniform3fv(glGetUniformLocation(shader.Program, "lightPos"), 1, &lightPos[0]);
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glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "lightSpaceMatrix"), 1, GL_FALSE, glm::value_ptr(lightSpaceMatrix));
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// Enable/Disable shadows by pressing 'SPACE'
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glUniform1i(glGetUniformLocation(shader.Program, "shadows"), shadows);
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shader.setMat4("projection", projection);
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shader.setMat4("view", view);
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// set light uniforms
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shader.setVec3("viewPos", camera.Position);
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shader.setVec3("lightPos", lightPos);
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shader.setMat4("lightSpaceMatrix", lightSpaceMatrix);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, woodTexture);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, depthMap);
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RenderScene(shader);
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renderScene(shader);
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// 3. DEBUG: visualize depth map by rendering it to plane
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debugDepthQuad.Use();
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glUniform1f(glGetUniformLocation(debugDepthQuad.Program, "near_plane"), near_plane);
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glUniform1f(glGetUniformLocation(debugDepthQuad.Program, "far_plane"), far_plane);
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// render Depth map to quad for visual debugging
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// ---------------------------------------------
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debugDepthQuad.use();
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debugDepthQuad.setFloat("near_plane", near_plane);
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debugDepthQuad.setFloat("far_plane", far_plane);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, depthMap);
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//RenderQuad(); // uncomment this line to see depth map
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//renderQuad();
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// Swap the buffers
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// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
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// -------------------------------------------------------------------------------
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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// optional: de-allocate all resources once they've outlived their purpose:
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// ------------------------------------------------------------------------
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glDeleteVertexArrays(1, &planeVAO);
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glDeleteBuffers(1, &planeVBO);
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glfwTerminate();
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return 0;
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}
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void RenderScene(Shader &shader)
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// renders the 3D scene
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// --------------------
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void renderScene(const Shader &shader)
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{
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// Floor
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// floor
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glm::mat4 model;
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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shader.setMat4("model", model);
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glBindVertexArray(planeVAO);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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glBindVertexArray(0);
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// Cubes
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// cubes
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model = glm::mat4();
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model = glm::translate(model, glm::vec3(0.0f, 1.5f, 0.0));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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RenderCube();
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model = glm::scale(model, glm::vec3(0.5f));
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shader.setMat4("model", model);
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renderCube();
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model = glm::mat4();
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model = glm::translate(model, glm::vec3(2.0f, 0.0f, 1.0));
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glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
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RenderCube();
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model = glm::scale(model, glm::vec3(0.5f));
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shader.setMat4("model", model);
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renderCube();
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model = glm::mat4();
|
||||
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, 2.0));
|
||||
model = glm::rotate(model, 60.0f, glm::normalize(glm::vec3(1.0, 0.0, 1.0)));
|
||||
model = glm::scale(model, glm::vec3(0.5));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
|
||||
RenderCube();
|
||||
model = glm::rotate(model, glm::radians(60.0f), glm::normalize(glm::vec3(1.0, 0.0, 1.0)));
|
||||
model = glm::scale(model, glm::vec3(0.25));
|
||||
shader.setMat4("model", model);
|
||||
renderCube();
|
||||
}
|
||||
|
||||
|
||||
// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
|
||||
// and post-processing effects.
|
||||
GLuint quadVAO = 0;
|
||||
GLuint quadVBO;
|
||||
void RenderQuad()
|
||||
// renderCube() renders a 1x1 3D cube in NDC.
|
||||
// -------------------------------------------------
|
||||
unsigned int cubeVAO = 0;
|
||||
unsigned int cubeVBO = 0;
|
||||
void renderCube()
|
||||
{
|
||||
// initialize (if necessary)
|
||||
if (cubeVAO == 0)
|
||||
{
|
||||
float vertices[] = {
|
||||
// back face
|
||||
-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
|
||||
1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
|
||||
1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
|
||||
1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
|
||||
-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
|
||||
-1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, // top-left
|
||||
// front face
|
||||
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
|
||||
1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
|
||||
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
|
||||
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
|
||||
-1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
|
||||
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
|
||||
// left face
|
||||
-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
|
||||
-1.0f, 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
|
||||
-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
|
||||
-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
|
||||
-1.0f, -1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
|
||||
-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
|
||||
// right face
|
||||
1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
|
||||
1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
|
||||
1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
|
||||
1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
|
||||
1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
|
||||
1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
|
||||
// bottom face
|
||||
-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
|
||||
1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
|
||||
1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
|
||||
1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
|
||||
-1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
|
||||
-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
|
||||
// top face
|
||||
-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
|
||||
1.0f, 1.0f , 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
|
||||
1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
|
||||
1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
|
||||
-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
|
||||
-1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
|
||||
};
|
||||
glGenVertexArrays(1, &cubeVAO);
|
||||
glGenBuffers(1, &cubeVBO);
|
||||
// fill buffer
|
||||
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
|
||||
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
|
||||
// link vertex attributes
|
||||
glBindVertexArray(cubeVAO);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
|
||||
glEnableVertexAttribArray(2);
|
||||
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
|
||||
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
||||
glBindVertexArray(0);
|
||||
}
|
||||
// render Cube
|
||||
glBindVertexArray(cubeVAO);
|
||||
glDrawArrays(GL_TRIANGLES, 0, 36);
|
||||
glBindVertexArray(0);
|
||||
}
|
||||
|
||||
// renderQuad() renders a 1x1 XY quad in NDC
|
||||
// -----------------------------------------
|
||||
unsigned int quadVAO = 0;
|
||||
unsigned int quadVBO;
|
||||
void renderQuad()
|
||||
{
|
||||
if (quadVAO == 0)
|
||||
{
|
||||
GLfloat quadVertices[] = {
|
||||
// Positions // Texture Coords
|
||||
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
|
||||
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
|
||||
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
|
||||
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
|
||||
float quadVertices[] = {
|
||||
// positions // texture Coords
|
||||
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
|
||||
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
|
||||
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
|
||||
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
|
||||
};
|
||||
// Setup plane VAO
|
||||
// setup plane VAO
|
||||
glGenVertexArrays(1, &quadVAO);
|
||||
glGenBuffers(1, &quadVBO);
|
||||
glBindVertexArray(quadVAO);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
|
||||
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
|
||||
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
|
||||
}
|
||||
glBindVertexArray(quadVAO);
|
||||
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
|
||||
glBindVertexArray(0);
|
||||
}
|
||||
|
||||
// RenderCube() Renders a 1x1 3D cube in NDC.
|
||||
GLuint cubeVAO = 0;
|
||||
GLuint cubeVBO = 0;
|
||||
void RenderCube()
|
||||
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
|
||||
// ---------------------------------------------------------------------------------------------------------
|
||||
void processInput(GLFWwindow *window)
|
||||
{
|
||||
// Initialize (if necessary)
|
||||
if (cubeVAO == 0)
|
||||
{
|
||||
GLfloat vertices[] = {
|
||||
// Back face
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
|
||||
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
|
||||
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
|
||||
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
|
||||
// Front face
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
|
||||
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
|
||||
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
|
||||
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
|
||||
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
|
||||
// Left face
|
||||
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
|
||||
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
|
||||
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
|
||||
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
|
||||
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
|
||||
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
|
||||
// Right face
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
|
||||
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
|
||||
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
|
||||
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
|
||||
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
|
||||
// Bottom face
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
|
||||
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
|
||||
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
|
||||
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
|
||||
// Top face
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
|
||||
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
|
||||
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
|
||||
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
|
||||
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
|
||||
};
|
||||
glGenVertexArrays(1, &cubeVAO);
|
||||
glGenBuffers(1, &cubeVBO);
|
||||
// Fill buffer
|
||||
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
|
||||
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
|
||||
// Link vertex attributes
|
||||
glBindVertexArray(cubeVAO);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
|
||||
glEnableVertexAttribArray(2);
|
||||
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
|
||||
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
||||
glBindVertexArray(0);
|
||||
}
|
||||
// Render Cube
|
||||
glBindVertexArray(cubeVAO);
|
||||
glDrawArrays(GL_TRIANGLES, 0, 36);
|
||||
glBindVertexArray(0);
|
||||
}
|
||||
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
|
||||
glfwSetWindowShouldClose(window, true);
|
||||
|
||||
// This function loads a texture from file. Note: texture loading functions like these are usually
|
||||
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
|
||||
// For learning purposes we'll just define it as a utility function.
|
||||
GLuint loadTexture(GLchar const * path)
|
||||
{
|
||||
// Generate texture ID and load texture data
|
||||
GLuint textureID;
|
||||
glGenTextures(1, &textureID);
|
||||
int width, height;
|
||||
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
|
||||
// Assign texture to ID
|
||||
glBindTexture(GL_TEXTURE_2D, textureID);
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
|
||||
glGenerateMipmap(GL_TEXTURE_2D);
|
||||
|
||||
// Parameters
|
||||
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);
|
||||
glBindTexture(GL_TEXTURE_2D, 0);
|
||||
SOIL_free_image_data(image);
|
||||
return textureID;
|
||||
|
||||
}
|
||||
|
||||
bool keys[1024];
|
||||
bool keysPressed[1024];
|
||||
// Moves/alters the camera positions based on user input
|
||||
void Do_Movement()
|
||||
{
|
||||
// Camera controls
|
||||
if (keys[GLFW_KEY_W])
|
||||
float cameraSpeed = 2.5 * deltaTime;
|
||||
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
|
||||
camera.ProcessKeyboard(FORWARD, deltaTime);
|
||||
if (keys[GLFW_KEY_S])
|
||||
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
|
||||
camera.ProcessKeyboard(BACKWARD, deltaTime);
|
||||
if (keys[GLFW_KEY_A])
|
||||
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
|
||||
camera.ProcessKeyboard(LEFT, deltaTime);
|
||||
if (keys[GLFW_KEY_D])
|
||||
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
|
||||
camera.ProcessKeyboard(RIGHT, deltaTime);
|
||||
|
||||
if (keys[GLFW_KEY_SPACE] && !keysPressed[GLFW_KEY_SPACE])
|
||||
{
|
||||
shadows = !shadows;
|
||||
keysPressed[GLFW_KEY_SPACE] = true;
|
||||
}
|
||||
}
|
||||
|
||||
GLfloat lastX = 400, lastY = 300;
|
||||
bool firstMouse = true;
|
||||
// Is called whenever a key is pressed/released via GLFW
|
||||
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
|
||||
// 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)
|
||||
{
|
||||
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
|
||||
glfwSetWindowShouldClose(window, GL_TRUE);
|
||||
|
||||
if (key >= 0 && key <= 1024)
|
||||
{
|
||||
if (action == GLFW_PRESS)
|
||||
keys[key] = true;
|
||||
else if (action == GLFW_RELEASE)
|
||||
{
|
||||
keys[key] = false;
|
||||
keysPressed[key] = false;
|
||||
}
|
||||
}
|
||||
// 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);
|
||||
}
|
||||
|
||||
|
||||
// glfw: whenever the mouse moves, this callback is called
|
||||
// -------------------------------------------------------
|
||||
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
{
|
||||
if (firstMouse)
|
||||
@@ -420,8 +416,8 @@ void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
firstMouse = false;
|
||||
}
|
||||
|
||||
GLfloat xoffset = xpos - lastX;
|
||||
GLfloat yoffset = lastY - ypos;
|
||||
float xoffset = xpos - lastX;
|
||||
float yoffset = lastY - ypos; // reversed since y-coordinates go from bottom to top
|
||||
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
@@ -429,7 +425,48 @@ void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
camera.ProcessMouseMovement(xoffset, yoffset);
|
||||
}
|
||||
|
||||
// glfw: whenever the mouse scroll wheel scrolls, this callback is called
|
||||
// ----------------------------------------------------------------------
|
||||
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
|
||||
{
|
||||
camera.ProcessMouseScroll(yoffset);
|
||||
}
|
||||
|
||||
// utility function for loading a 2D texture from file
|
||||
// ---------------------------------------------------
|
||||
unsigned int loadTexture(char const * path)
|
||||
{
|
||||
unsigned int textureID;
|
||||
glGenTextures(1, &textureID);
|
||||
|
||||
int width, height, nrComponents;
|
||||
unsigned char *data = stbi_load(path, &width, &height, &nrComponents, 0);
|
||||
if (data)
|
||||
{
|
||||
GLenum format;
|
||||
if (nrComponents == 1)
|
||||
format = GL_RED;
|
||||
else if (nrComponents == 3)
|
||||
format = GL_RGB;
|
||||
else if (nrComponents == 4)
|
||||
format = GL_RGBA;
|
||||
|
||||
glBindTexture(GL_TEXTURE_2D, textureID);
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
|
||||
glGenerateMipmap(GL_TEXTURE_2D);
|
||||
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, format == GL_RGBA ? GL_CLAMP_TO_EDGE : GL_REPEAT); // for this tutorial: use GL_CLAMP_TO_EDGE to prevent semi-transparent borders. Due to interpolation it takes texels from next repeat
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, format == GL_RGBA ? GL_CLAMP_TO_EDGE : GL_REPEAT);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
|
||||
stbi_image_free(data);
|
||||
}
|
||||
else
|
||||
{
|
||||
std::cout << "Texture failed to load at path: " << path << std::endl;
|
||||
stbi_image_free(data);
|
||||
}
|
||||
|
||||
return textureID;
|
||||
}
|
||||
Reference in New Issue
Block a user