mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
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Code re-work: advanced lighting.
This commit is contained in:
Joey de Vries
435
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping.cpp
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435
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping.cpp
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@@ -0,0 +1,435 @@
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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 <GLFW/glfw3.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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// Properties
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const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
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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 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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// Camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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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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// Options
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GLboolean shadows = true;
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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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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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glfwMakeContextCurrent(window);
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// Set the required callback functions
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glfwSetKeyCallback(window, key_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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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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// 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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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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// 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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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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};
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// Setup plane VAO
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GLuint 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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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)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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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
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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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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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glGenFramebuffers(1, &depthMapFBO);
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// - Create depth texture
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GLuint 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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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
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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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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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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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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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// Change light position over time
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lightPos.z = cos(glfwGetTime()) * 2.0f;
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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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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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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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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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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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// 2. Render scene as normal
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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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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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// 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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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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// Swap the buffers
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glfwSwapBuffers(window);
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}
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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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{
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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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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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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::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::mat4();
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model = glm::translate(model, glm::vec3(-1.0f, 0.0f, 2.0));
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model = glm::rotate(model, 60.0f, glm::normalize(glm::vec3(1.0, 0.0, 1.0)));
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model = glm::scale(model, glm::vec3(0.5));
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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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}
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// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
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// and post-processing effects.
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GLuint quadVAO = 0;
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GLuint quadVBO;
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void RenderQuad()
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{
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if (quadVAO == 0)
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{
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GLfloat quadVertices[] = {
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// Positions // Texture Coords
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-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
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-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
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1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
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1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
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};
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// Setup plane VAO
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glGenVertexArrays(1, &quadVAO);
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glGenBuffers(1, &quadVBO);
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glBindVertexArray(quadVAO);
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glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
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}
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glBindVertexArray(quadVAO);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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glBindVertexArray(0);
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}
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// RenderCube() Renders a 1x1 3D cube in NDC.
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GLuint cubeVAO = 0;
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GLuint cubeVBO = 0;
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void RenderCube()
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{
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// Initialize (if necessary)
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if (cubeVAO == 0)
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{
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GLfloat vertices[] = {
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// Back face
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
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0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
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-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
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// Front face
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
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// Left face
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
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-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
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-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
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// Right face
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
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0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
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// Bottom face
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
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0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
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-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
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// Top face
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
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0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
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};
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glGenVertexArrays(1, &cubeVAO);
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glGenBuffers(1, &cubeVBO);
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// Fill buffer
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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);
|
||||
}
|
||||
|
||||
// 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])
|
||||
camera.ProcessKeyboard(FORWARD, deltaTime);
|
||||
if (keys[GLFW_KEY_S])
|
||||
camera.ProcessKeyboard(BACKWARD, deltaTime);
|
||||
if (keys[GLFW_KEY_A])
|
||||
camera.ProcessKeyboard(LEFT, deltaTime);
|
||||
if (keys[GLFW_KEY_D])
|
||||
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)
|
||||
{
|
||||
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;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
{
|
||||
if (firstMouse)
|
||||
{
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
firstMouse = false;
|
||||
}
|
||||
|
||||
GLfloat xoffset = xpos - lastX;
|
||||
GLfloat yoffset = lastY - ypos;
|
||||
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
|
||||
camera.ProcessMouseMovement(xoffset, yoffset);
|
||||
}
|
||||
|
||||
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
|
||||
{
|
||||
camera.ProcessMouseScroll(yoffset);
|
||||
}
|
||||
Reference in New Issue
Block a user