Initial commit, all code samples with working CMake script for VS/Windows.

src/2.lighting/1.colors/colors.frag

@@ -0,0 +1,10 @@
+#version 330 core
+out vec4 color;
+  
+uniform vec3 objectColor;
+uniform vec3 lightColor;
+
+void main()
+{
+    color = vec4(lightColor * objectColor, 1.0f);
+}

src/2.lighting/1.colors/colors.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/1.colors/colors_scene.cpp

@@ -0,0 +1,272 @@
+#include <iostream>
+#include <cmath>
+
+// GLEW
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+// Other Libs
+#include <SOIL.h>
+// GLM Mathematics
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+// Other includes
+#include <learnopengl/shader.h>
+#include <learnopengl/camera.h>
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void do_movement();
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// Camera
+Camera  camera(glm::vec3(0.0f, 0.0f, 3.0f));
+GLfloat lastX  =  WIDTH  / 2.0;
+GLfloat lastY  =  HEIGHT / 2.0;
+bool    keys[1024];
+
+// Light attributes
+glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
+
+// Deltatime
+GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
+GLfloat lastFrame = 0.0f;  	// Time of last frame
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // GLFW Options
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
+    glewExperimental = GL_TRUE;
+    // Initialize GLEW to setup the OpenGL Function pointers
+    glewInit();
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // OpenGL options
+    glEnable(GL_DEPTH_TEST);
+
+
+    // Build and compile our shader program
+    Shader lightingShader("colors.vs", "colors.frag");
+    Shader lampShader("lamp.vs", "lamp.frag");
+
+    // Set up vertex data (and buffer(s)) and attribute pointers
+    GLfloat vertices[] = {
+        -0.5f, -0.5f, -0.5f,
+         0.5f, -0.5f, -0.5f,
+         0.5f,  0.5f, -0.5f,
+         0.5f,  0.5f, -0.5f,
+        -0.5f,  0.5f, -0.5f,
+        -0.5f, -0.5f, -0.5f,
+
+        -0.5f, -0.5f,  0.5f,
+         0.5f, -0.5f,  0.5f,
+         0.5f,  0.5f,  0.5f,
+         0.5f,  0.5f,  0.5f,
+        -0.5f,  0.5f,  0.5f,
+        -0.5f, -0.5f,  0.5f,
+
+        -0.5f,  0.5f,  0.5f,
+        -0.5f,  0.5f, -0.5f,
+        -0.5f, -0.5f, -0.5f,
+        -0.5f, -0.5f, -0.5f,
+        -0.5f, -0.5f,  0.5f,
+        -0.5f,  0.5f,  0.5f,
+
+         0.5f,  0.5f,  0.5f,
+         0.5f,  0.5f, -0.5f,
+         0.5f, -0.5f, -0.5f,
+         0.5f, -0.5f, -0.5f,
+         0.5f, -0.5f,  0.5f,
+         0.5f,  0.5f,  0.5f,
+
+        -0.5f, -0.5f, -0.5f,
+         0.5f, -0.5f, -0.5f,
+         0.5f, -0.5f,  0.5f,
+         0.5f, -0.5f,  0.5f,
+        -0.5f, -0.5f,  0.5f,
+        -0.5f, -0.5f, -0.5f,
+
+        -0.5f,  0.5f, -0.5f,
+         0.5f,  0.5f, -0.5f,
+         0.5f,  0.5f,  0.5f,
+         0.5f,  0.5f,  0.5f,
+        -0.5f,  0.5f,  0.5f,
+        -0.5f,  0.5f, -0.5f
+    };
+    // First, set the container's VAO (and VBO)
+    GLuint VBO, containerVAO;
+    glGenVertexArrays(1, &containerVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(containerVAO);
+    // Position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+
+    // Then, we set the light's VAO (VBO stays the same. After all, the vertices are the same for the light object (also a 3D cube))
+    GLuint lightVAO;
+    glGenVertexArrays(1, &lightVAO);
+    glBindVertexArray(lightVAO);
+    // We only need to bind to the VBO (to link it with glVertexAttribPointer), no need to fill it; the VBO's data already contains all we need.
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    // Set the vertex attributes (only position data for the lamp))
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+    
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Calculate deltatime of current frame
+        GLfloat currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+        do_movement();
+
+        // Clear the colorbuffer
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        // Use cooresponding shader when setting uniforms/drawing objects
+        lightingShader.Use();
+        GLint objectColorLoc = glGetUniformLocation(lightingShader.Program, "objectColor");
+        GLint lightColorLoc  = glGetUniformLocation(lightingShader.Program, "lightColor");
+        glUniform3f(objectColorLoc, 1.0f, 0.5f, 0.31f);
+        glUniform3f(lightColorLoc,  1.0f, 0.5f, 1.0f);
+
+        // Create camera transformations
+        glm::mat4 view;
+        view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
+        // Get the uniform locations
+        GLint modelLoc = glGetUniformLocation(lightingShader.Program, "model");
+        GLint viewLoc  = glGetUniformLocation(lightingShader.Program,  "view");
+        GLint projLoc  = glGetUniformLocation(lightingShader.Program,  "projection");
+        // Pass the matrices to the shader
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+        // Draw the container (using container's vertex attributes)
+        glBindVertexArray(containerVAO);
+        glm::mat4 model;
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Also draw the lamp object, again binding the appropriate shader
+        lampShader.Use();
+        // Get location objects for the matrices on the lamp shader (these could be different on a different shader)
+        modelLoc = glGetUniformLocation(lampShader.Program, "model");
+        viewLoc  = glGetUniformLocation(lampShader.Program, "view");
+        projLoc  = glGetUniformLocation(lampShader.Program, "projection");
+        // Set matrices
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+        model = glm::mat4();
+        model = glm::translate(model, lightPos);
+        model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        // Draw the light object (using light's vertex attributes)
+        glBindVertexArray(lightVAO);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminate GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// 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;
+    }
+}
+
+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);
+}
+
+bool firstMouse = true;
+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;  // Reversed since y-coordinates go from bottom to left
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(yoffset);
+}

src/2.lighting/1.colors/lamp.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 color;
+
+void main()
+{
+    color = vec4(1.0f); // Set alle 4 vector values to 1.0f
+}

src/2.lighting/1.colors/lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/2.basic_lighting/basic_lighting.frag

@@ -0,0 +1,33 @@
+#version 330 core
+out vec4 color;
+
+in vec3 FragPos;  
+in vec3 Normal;  
+  
+uniform vec3 lightPos; 
+uniform vec3 viewPos;
+uniform vec3 lightColor;
+uniform vec3 objectColor;
+
+void main()
+{
+    // Ambient
+    float ambientStrength = 0.1f;
+    vec3 ambient = ambientStrength * lightColor;
+  	
+    // Diffuse 
+    vec3 norm = normalize(Normal);
+    vec3 lightDir = normalize(lightPos - FragPos);
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = diff * lightColor;
+    
+    // Specular
+    float specularStrength = 0.5f;
+    vec3 viewDir = normalize(viewPos - FragPos);
+    vec3 reflectDir = reflect(-lightDir, norm);  
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
+    vec3 specular = specularStrength * spec * lightColor;  
+        
+    vec3 result = (ambient + diffuse + specular) * objectColor;
+    color = vec4(result, 1.0f);
+} 

src/2.lighting/2.basic_lighting/basic_lighting.vs

@@ -0,0 +1,17 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec3 normal;
+
+out vec3 Normal;
+out vec3 FragPos;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view *  model * vec4(position, 1.0f);
+    FragPos = vec3(model * vec4(position, 1.0f));
+    Normal = mat3(transpose(inverse(model))) * normal;  
+} 

src/2.lighting/2.basic_lighting/basic_lighting_specular.cpp

@@ -0,0 +1,281 @@
+#include <iostream>
+#include <cmath>
+
+// GLEW
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+// Other Libs
+#include <SOIL.h>
+// GLM Mathematics
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+// Other includes
+#include <learnopengl/shader.h>
+#include <learnopengl/camera.h>
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void do_movement();
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// Camera
+Camera  camera(glm::vec3(0.0f, 0.0f, 3.0f));
+GLfloat lastX  =  WIDTH  / 2.0;
+GLfloat lastY  =  HEIGHT / 2.0;
+bool    keys[1024];
+
+// Light attributes
+glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
+
+// Deltatime
+GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
+GLfloat lastFrame = 0.0f;  	// Time of last frame
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // GLFW Options
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
+    glewExperimental = GL_TRUE;
+    // Initialize GLEW to setup the OpenGL Function pointers
+    glewInit();
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // OpenGL options
+    glEnable(GL_DEPTH_TEST);
+
+
+    // Build and compile our shader program
+    Shader lightingShader("basic_lighting.vs", "basic_lighting.frag");
+    Shader lampShader("lamp.vs", "lamp.frag");
+
+    // Set up vertex data (and buffer(s)) and attribute pointers
+    GLfloat vertices[] = {
+        -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+         0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+         0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+         0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+        -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+        -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+
+        -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+         0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+        -0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+        -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+
+        -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+
+         0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+
+        -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+         0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+         0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+         0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+        -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+        -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+
+        -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+         0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+        -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+        -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f
+    };
+    // First, set the container's VAO (and VBO)
+    GLuint VBO, containerVAO;
+    glGenVertexArrays(1, &containerVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(containerVAO);
+    // Position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    // Normal attribute
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(1);
+    glBindVertexArray(0);
+
+    // Then, we set the light's VAO (VBO stays the same. After all, the vertices are the same for the light object (also a 3D cube))
+    GLuint lightVAO;
+    glGenVertexArrays(1, &lightVAO);
+    glBindVertexArray(lightVAO);
+    // We only need to bind to the VBO (to link it with glVertexAttribPointer), no need to fill it; the VBO's data already contains all we need.
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    // Set the vertex attributes (only position data for the lamp))
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0); // Note that we skip over the normal vectors
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+    
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Calculate deltatime of current frame
+        GLfloat currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+        do_movement();
+
+        // Clear the colorbuffer
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+        // Use cooresponding shader when setting uniforms/drawing objects
+        lightingShader.Use();
+        GLint objectColorLoc = glGetUniformLocation(lightingShader.Program, "objectColor");
+        GLint lightColorLoc  = glGetUniformLocation(lightingShader.Program, "lightColor");
+        GLint lightPosLoc    = glGetUniformLocation(lightingShader.Program, "lightPos");
+        GLint viewPosLoc     = glGetUniformLocation(lightingShader.Program, "viewPos");
+        glUniform3f(objectColorLoc, 1.0f, 0.5f, 0.31f);
+        glUniform3f(lightColorLoc,  1.0f, 1.0f, 1.0f);
+        glUniform3f(lightPosLoc,    lightPos.x, lightPos.y, lightPos.z);
+        glUniform3f(viewPosLoc,     camera.Position.x, camera.Position.y, camera.Position.z);
+
+
+
+        // Create camera transformations
+        glm::mat4 view;
+        view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
+        // Get the uniform locations
+        GLint modelLoc = glGetUniformLocation(lightingShader.Program, "model");
+        GLint viewLoc  = glGetUniformLocation(lightingShader.Program,  "view");
+        GLint projLoc  = glGetUniformLocation(lightingShader.Program,  "projection");
+        // Pass the matrices to the shader
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+        // Draw the container (using container's vertex attributes)
+        glBindVertexArray(containerVAO);
+        glm::mat4 model;
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Also draw the lamp object, again binding the appropriate shader
+        lampShader.Use();
+        // Get location objects for the matrices on the lamp shader (these could be different on a different shader)
+        modelLoc = glGetUniformLocation(lampShader.Program, "model");
+        viewLoc  = glGetUniformLocation(lampShader.Program, "view");
+        projLoc  = glGetUniformLocation(lampShader.Program, "projection");
+        // Set matrices
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+        model = glm::mat4();
+        model = glm::translate(model, lightPos);
+        model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        // Draw the light object (using light's vertex attributes)
+        glBindVertexArray(lightVAO);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminate GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// 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;
+    }
+}
+
+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);
+}
+
+bool firstMouse = true;
+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;  // Reversed since y-coordinates go from bottom to left
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(yoffset);
+}

src/2.lighting/2.basic_lighting/lamp.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 color;
+
+void main()
+{
+    color = vec4(1.0f); // Set alle 4 vector values to 1.0f
+}

src/2.lighting/2.basic_lighting/lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/3.materials/lamp.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 color;
+
+void main()
+{
+    color = vec4(1.0f); // Set alle 4 vector values to 1.0f
+}

src/2.lighting/3.materials/lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/3.materials/materials.cpp

@@ -0,0 +1,291 @@
+#include <iostream>
+#include <cmath>
+
+// GLEW
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+// Other Libs
+#include <SOIL.h>
+// GLM Mathematics
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+// Other includes
+#include <learnopengl/shader.h>
+#include <learnopengl/camera.h>
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void do_movement();
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// Camera
+Camera  camera(glm::vec3(0.0f, 0.0f, 3.0f));
+GLfloat lastX  =  WIDTH  / 2.0;
+GLfloat lastY  =  HEIGHT / 2.0;
+bool    keys[1024];
+
+// Light attributes
+glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
+
+// Deltatime
+GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
+GLfloat lastFrame = 0.0f;  	// Time of last frame
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // GLFW Options
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
+    glewExperimental = GL_TRUE;
+    // Initialize GLEW to setup the OpenGL Function pointers
+    glewInit();
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // OpenGL options
+    glEnable(GL_DEPTH_TEST);
+
+
+    // Build and compile our shader program
+    Shader lightingShader("materials.vs", "materials.frag");
+    Shader lampShader("lamp.vs", "lamp.frag");
+
+    // Set up vertex data (and buffer(s)) and attribute pointers
+    GLfloat vertices[] = {
+        -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+         0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+         0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+         0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+        -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+        -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+
+        -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+         0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+        -0.5f,  0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+        -0.5f, -0.5f,  0.5f,  0.0f,  0.0f,  1.0f,
+
+        -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+        -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+
+         0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+         0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+
+        -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+         0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+         0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+         0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+        -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+        -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+
+        -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+         0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+         0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+        -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+        -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f
+    };
+    // First, set the container's VAO (and VBO)
+    GLuint VBO, containerVAO;
+    glGenVertexArrays(1, &containerVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(containerVAO);
+    // Position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    // Normal attribute
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(1);
+    glBindVertexArray(0);
+
+    // Then, we set the light's VAO (VBO stays the same. After all, the vertices are the same for the light object (also a 3D cube))
+    GLuint lightVAO;
+    glGenVertexArrays(1, &lightVAO);
+    glBindVertexArray(lightVAO);
+    // We only need to bind to the VBO (to link it with glVertexAttribPointer), no need to fill it; the VBO's data already contains all we need.
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    // Set the vertex attributes (only position data for the lamp))
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), (GLvoid*)0); // Note that we skip over the normal vectors
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+    
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Calculate deltatime of current frame
+        GLfloat currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+        do_movement();
+
+        // Clear the colorbuffer
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+
+        // Use cooresponding shader when setting uniforms/drawing objects
+        lightingShader.Use();
+        GLint lightPosLoc    = glGetUniformLocation(lightingShader.Program, "light.position");
+        GLint viewPosLoc     = glGetUniformLocation(lightingShader.Program, "viewPos");
+        glUniform3f(lightPosLoc,    lightPos.x, lightPos.y, lightPos.z);
+        glUniform3f(viewPosLoc,     camera.Position.x, camera.Position.y, camera.Position.z);
+        // Set lights properties
+        glm::vec3 lightColor;
+        lightColor.x = sin(glfwGetTime() * 2.0f);
+        lightColor.y = sin(glfwGetTime() * 0.7f);
+        lightColor.z = sin(glfwGetTime() * 1.3f);
+        glm::vec3 diffuseColor = lightColor * glm::vec3(0.5f); // Decrease the influence
+        glm::vec3 ambientColor = diffuseColor * glm::vec3(0.2f); // Low influence
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.ambient"),  ambientColor.x, ambientColor.y, ambientColor.z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.diffuse"),  diffuseColor.x, diffuseColor.y, diffuseColor.z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.specular"), 1.0f, 1.0f, 1.0f);
+        // Set material properties
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "material.ambient"),   1.0f, 0.5f, 0.31f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "material.diffuse"),   1.0f, 0.5f, 0.31f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "material.specular"),  0.5f, 0.5f, 0.5f); // Specular doesn't have full effect on this object's material
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "material.shininess"), 32.0f);
+
+        // Create camera transformations
+        glm::mat4 view;
+        view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
+        // Get the uniform locations
+        GLint modelLoc = glGetUniformLocation(lightingShader.Program, "model");
+        GLint viewLoc  = glGetUniformLocation(lightingShader.Program,  "view");
+        GLint projLoc  = glGetUniformLocation(lightingShader.Program,  "projection");
+        // Pass the matrices to the shader
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+        // Draw the container (using container's vertex attributes)
+        glBindVertexArray(containerVAO);
+        glm::mat4 model;
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Also draw the lamp object, again binding the appropriate shader
+        lampShader.Use();
+        // Get location objects for the matrices on the lamp shader (these could be different on a different shader)
+        modelLoc = glGetUniformLocation(lampShader.Program, "model");
+        viewLoc  = glGetUniformLocation(lampShader.Program, "view");
+        projLoc  = glGetUniformLocation(lampShader.Program, "projection");
+        // Set matrices
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+        model = glm::mat4();
+        model = glm::translate(model, lightPos);
+        model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        // Draw the light object (using light's vertex attributes)
+        glBindVertexArray(lightVAO);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminate GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// 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;
+    }
+}
+
+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);
+}
+
+bool firstMouse = true;
+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;  // Reversed since y-coordinates go from bottom to left
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(yoffset);
+}

src/2.lighting/3.materials/materials.frag

@@ -0,0 +1,45 @@
+#version 330 core
+struct Material {
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;    
+    float shininess;
+}; 
+
+struct Light {
+    vec3 position;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
+in vec3 FragPos;  
+in vec3 Normal;  
+  
+out vec4 color;
+  
+uniform vec3 viewPos;
+uniform Material material;
+uniform Light light;
+
+void main()
+{
+    // Ambient
+    vec3 ambient = light.ambient * material.ambient;
+  	
+    // Diffuse 
+    vec3 norm = normalize(Normal);
+    vec3 lightDir = normalize(light.position - FragPos);
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = light.diffuse * (diff * material.diffuse);
+    
+    // Specular
+    vec3 viewDir = normalize(viewPos - FragPos);
+    vec3 reflectDir = reflect(-lightDir, norm);  
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    vec3 specular = light.specular * (spec * material.specular);  
+        
+    vec3 result = ambient + diffuse + specular;
+    color = vec4(result, 1.0f);
+} 

src/2.lighting/3.materials/materials.vs

@@ -0,0 +1,17 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec3 normal;
+
+out vec3 Normal;
+out vec3 FragPos;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view *  model * vec4(position, 1.0f);
+    FragPos = vec3(model * vec4(position, 1.0f));
+    Normal = mat3(transpose(inverse(model))) * normal;  
+} 

src/2.lighting/4.lighting_maps/lamp.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 color;
+
+void main()
+{
+    color = vec4(1.0f); // Set alle 4 vector values to 1.0f
+}

src/2.lighting/4.lighting_maps/lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/4.lighting_maps/lighting_maps.frag

@@ -0,0 +1,44 @@
+#version 330 core
+struct Material {
+    sampler2D diffuse;
+    sampler2D specular;
+    float     shininess;
+};  
+
+struct Light {
+    vec3 position;
+
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
+in vec3 FragPos;  
+in vec3 Normal;  
+in vec2 TexCoords;
+  
+out vec4 color;
+  
+uniform vec3 viewPos;
+uniform Material material;
+uniform Light light;
+
+void main()
+{
+    // Ambient
+    vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
+  	
+    // Diffuse 
+    vec3 norm = normalize(Normal);
+    vec3 lightDir = normalize(light.position - FragPos);
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));  
+    
+    // Specular
+    vec3 viewDir = normalize(viewPos - FragPos);
+    vec3 reflectDir = reflect(-lightDir, norm);  
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));
+        
+    color = vec4(ambient + diffuse + specular, 1.0f);  
+} 

src/2.lighting/4.lighting_maps/lighting_maps.vs

@@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec3 normal;
+layout (location = 2) in vec2 texCoords;
+
+out vec3 Normal;
+out vec3 FragPos;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view *  model * vec4(position, 1.0f);
+    FragPos = vec3(model * vec4(position, 1.0f));
+    Normal = mat3(transpose(inverse(model))) * normal;  
+    TexCoords = texCoords;
+} 

src/2.lighting/4.lighting_maps/lighting_maps_specular.cpp

@@ -0,0 +1,326 @@
+#include <iostream>
+#include <cmath>
+
+// GLEW
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+// Other Libs
+#include <SOIL.h>
+// GLM Mathematics
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+// Other includes
+#include <learnopengl/shader.h>
+#include <learnopengl/camera.h>
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void do_movement();
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// Camera
+Camera  camera(glm::vec3(0.0f, 0.0f, 3.0f));
+GLfloat lastX  =  WIDTH  / 2.0;
+GLfloat lastY  =  HEIGHT / 2.0;
+bool    keys[1024];
+
+// Light attributes
+glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
+
+// Deltatime
+GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
+GLfloat lastFrame = 0.0f;  	// Time of last frame
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // GLFW Options
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
+    glewExperimental = GL_TRUE;
+    // Initialize GLEW to setup the OpenGL Function pointers
+    glewInit();
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // OpenGL options
+    glEnable(GL_DEPTH_TEST);
+
+
+    // Build and compile our shader program
+    Shader lightingShader("lighting_maps.vs", "lighting_maps.frag");
+    Shader lampShader("lamp.vs", "lamp.frag");
+
+    // Set up vertex data (and buffer(s)) and attribute pointers
+    GLfloat 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
+    };
+    // First, set the container's VAO (and VBO)
+    GLuint VBO, containerVAO;
+    glGenVertexArrays(1, &containerVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(containerVAO);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(2);
+    glBindVertexArray(0);
+
+    // Then, we set the light's VAO (VBO stays the same. After all, the vertices are the same for the light object (also a 3D cube))
+    GLuint lightVAO;
+    glGenVertexArrays(1, &lightVAO);
+    glBindVertexArray(lightVAO);
+    // We only need to bind to the VBO (to link it with glVertexAttribPointer), no need to fill it; the VBO's data already contains all we need.
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    // Set the vertex attributes (only position data for the lamp))
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0); // Note that we skip over the other data in our buffer object (we don't need the normals/textures, only positions).
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+    
+
+    // Load textures
+    GLuint diffuseMap, specularMap, emissionMap;
+    glGenTextures(1, &diffuseMap);
+    glGenTextures(1, &specularMap);
+    glGenTextures(1, &emissionMap);
+    int width, height;
+    unsigned char* image;
+    // Diffuse map
+    image = SOIL_load_image("../../../resources/textures/container2.png", &width, &height, 0, SOIL_LOAD_RGB);
+    glBindTexture(GL_TEXTURE_2D, diffuseMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    SOIL_free_image_data(image);
+    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_NEAREST_MIPMAP_NEAREST);
+    // Specular map
+    image = SOIL_load_image("../../../resources/textures/container2_specular.png", &width, &height, 0, SOIL_LOAD_RGB);
+    glBindTexture(GL_TEXTURE_2D, specularMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    SOIL_free_image_data(image);
+    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_NEAREST_MIPMAP_NEAREST);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+
+    // Set texture units
+    lightingShader.Use();
+    glUniform1i(glGetUniformLocation(lightingShader.Program, "material.diffuse"),  0);
+    glUniform1i(glGetUniformLocation(lightingShader.Program, "material.specular"), 1);
+
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Calculate deltatime of current frame
+        GLfloat currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+        do_movement();
+
+        // Clear the colorbuffer
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+
+        // Use cooresponding shader when setting uniforms/drawing objects
+        lightingShader.Use();
+        GLint lightPosLoc    = glGetUniformLocation(lightingShader.Program, "light.position");
+        GLint viewPosLoc     = glGetUniformLocation(lightingShader.Program, "viewPos");
+        glUniform3f(lightPosLoc,    lightPos.x, lightPos.y, lightPos.z);
+        glUniform3f(viewPosLoc,     camera.Position.x, camera.Position.y, camera.Position.z);
+        // Set lights properties
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.ambient"),  0.2f, 0.2f, 0.2f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.diffuse"),  0.5f, 0.5f, 0.5f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.specular"), 1.0f, 1.0f, 1.0f);
+        // Set material properties
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "material.shininess"), 32.0f);
+
+        // Create camera transformations
+        glm::mat4 view;
+        view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
+        // Get the uniform locations
+        GLint modelLoc = glGetUniformLocation(lightingShader.Program, "model");
+        GLint viewLoc  = glGetUniformLocation(lightingShader.Program,  "view");
+        GLint projLoc  = glGetUniformLocation(lightingShader.Program,  "projection");
+        // Pass the matrices to the shader
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+        // Bind diffuse map
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, diffuseMap);
+        // Bind specular map
+        glActiveTexture(GL_TEXTURE1);
+        glBindTexture(GL_TEXTURE_2D, specularMap);
+
+        // Draw the container (using container's vertex attributes)
+        glBindVertexArray(containerVAO);
+        glm::mat4 model;
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Also draw the lamp object, again binding the appropriate shader
+        lampShader.Use();
+        // Get location objects for the matrices on the lamp shader (these could be different on a different shader)
+        modelLoc = glGetUniformLocation(lampShader.Program, "model");
+        viewLoc  = glGetUniformLocation(lampShader.Program, "view");
+        projLoc  = glGetUniformLocation(lampShader.Program, "projection");
+        // Set matrices
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+        model = glm::mat4();
+        model = glm::translate(model, lightPos);
+        model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        // Draw the light object (using light's vertex attributes)
+        glBindVertexArray(lightVAO);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminate GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// 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;
+    }
+}
+
+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);
+}
+
+bool firstMouse = true;
+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;  // Reversed since y-coordinates go from bottom to left
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(yoffset);
+}

src/2.lighting/5.light_casters/lamp.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 color;
+
+void main()
+{
+    color = vec4(1.0f); // Set alle 4 vector values to 1.0f
+}

src/2.lighting/5.light_casters/lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/5.light_casters/light_casters.frag

@@ -0,0 +1,65 @@
+#version 330 core
+struct Material {
+    sampler2D diffuse;
+    sampler2D specular;
+    float     shininess;
+};  
+
+struct Light {
+    vec3 position;
+    vec3 direction;
+    float cutOff;
+    float outerCutOff;
+  
+    float constant;
+    float linear;
+    float quadratic;
+  
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;       
+};
+
+in vec3 FragPos;  
+in vec3 Normal;  
+in vec2 TexCoords;
+  
+out vec4 color;
+  
+uniform vec3 viewPos;
+uniform Material material;
+uniform Light light;
+
+void main()
+{
+    // Ambient
+    vec3 ambient = light.ambient * vec3(texture(material.diffuse, TexCoords));
+    
+    // Diffuse 
+    vec3 norm = normalize(Normal);        
+    vec3 lightDir = normalize(light.position - FragPos);
+    float diff = max(dot(norm, lightDir), 0.0);
+    vec3 diffuse = light.diffuse * diff * vec3(texture(material.diffuse, TexCoords));  
+    
+    // Specular
+    vec3 viewDir = normalize(viewPos - FragPos);
+    vec3 reflectDir = reflect(-lightDir, norm);  
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    vec3 specular = light.specular * spec * vec3(texture(material.specular, TexCoords));
+    
+    // Spotlight (soft edges)
+    float theta = dot(lightDir, normalize(-light.direction)); 
+    float epsilon = (light.cutOff - light.outerCutOff);
+    float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
+    diffuse  *= intensity;
+    specular *= intensity;
+    
+    // Attenuation
+    float distance    = length(light.position - FragPos);
+    float attenuation = 1.0f / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    
+    ambient  *= attenuation; 
+    diffuse  *= attenuation;
+    specular *= attenuation;   
+            
+    color = vec4(ambient + diffuse + specular, 1.0f);  
+} 

src/2.lighting/5.light_casters/light_casters.vs

@@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec3 normal;
+layout (location = 2) in vec2 texCoords;
+
+out vec3 Normal;
+out vec3 FragPos;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view *  model * vec4(position, 1.0f);
+    FragPos = vec3(model * vec4(position, 1.0f));
+    Normal = mat3(transpose(inverse(model))) * normal;  
+    TexCoords = texCoords;
+} 

src/2.lighting/5.light_casters/light_casters_spotlight_soft.cpp

@@ -0,0 +1,368 @@
+#include <iostream>
+#include <cmath>
+
+// GLEW
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+// Other Libs
+#include <SOIL.h>
+// GLM Mathematics
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+// Other includes
+#include <learnopengl/shader.h>
+#include <learnopengl/camera.h>
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void do_movement();
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// Camera
+Camera  camera(glm::vec3(0.0f, 0.0f, 3.0f));
+GLfloat lastX  =  WIDTH  / 2.0;
+GLfloat lastY  =  HEIGHT / 2.0;
+bool    keys[1024];
+
+// Light attributes
+glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
+
+// Deltatime
+GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
+GLfloat lastFrame = 0.0f;  	// Time of last frame
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // GLFW Options
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
+    glewExperimental = GL_TRUE;
+    // Initialize GLEW to setup the OpenGL Function pointers
+    glewInit();
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // OpenGL options
+    glEnable(GL_DEPTH_TEST);
+
+
+    // Build and compile our shader program
+    Shader lightingShader("light_casters.vs", "light_casters.frag");
+    Shader lampShader("lamp.vs", "lamp.frag");
+
+    // Set up vertex data (and buffer(s)) and attribute pointers
+    GLfloat 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
+    };
+    // Positions all containers
+    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)
+    };
+    // First, set the container's VAO (and VBO)
+    GLuint VBO, containerVAO;
+    glGenVertexArrays(1, &containerVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(containerVAO);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(2);
+    glBindVertexArray(0);
+
+    // Then, we set the light's VAO (VBO stays the same. After all, the vertices are the same for the light object (also a 3D cube))
+    GLuint lightVAO;
+    glGenVertexArrays(1, &lightVAO);
+    glBindVertexArray(lightVAO);
+    // We only need to bind to the VBO (to link it with glVertexAttribPointer), no need to fill it; the VBO's data already contains all we need.
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    // Set the vertex attributes (only position data for the lamp))
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0); // Note that we skip over the other data in our buffer object (we don't need the normals/textures, only positions).
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+    
+
+    // Load textures
+    GLuint diffuseMap, specularMap, emissionMap;
+    glGenTextures(1, &diffuseMap);
+    glGenTextures(1, &specularMap);
+    glGenTextures(1, &emissionMap);
+    int width, height;
+    unsigned char* image;
+    // Diffuse map
+    image = SOIL_load_image("../../../resources/textures/container2.png", &width, &height, 0, SOIL_LOAD_RGB);
+    glBindTexture(GL_TEXTURE_2D, diffuseMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    SOIL_free_image_data(image);
+    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_NEAREST_MIPMAP_NEAREST);
+    // Specular map
+    image = SOIL_load_image("../../../resources/textures/container2_specular.png", &width, &height, 0, SOIL_LOAD_RGB);
+    glBindTexture(GL_TEXTURE_2D, specularMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    SOIL_free_image_data(image);
+    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_NEAREST_MIPMAP_NEAREST);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+
+    // Set texture units
+    lightingShader.Use();
+    glUniform1i(glGetUniformLocation(lightingShader.Program, "material.diffuse"),  0);
+    glUniform1i(glGetUniformLocation(lightingShader.Program, "material.specular"), 1);
+
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Calculate deltatime of current frame
+        GLfloat currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+        do_movement();
+
+        // Clear the colorbuffer
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+
+        // Use cooresponding shader when setting uniforms/drawing objects
+        lightingShader.Use();
+        GLint lightPosLoc             = glGetUniformLocation(lightingShader.Program, "light.position");
+        GLint lightSpotdirLoc         = glGetUniformLocation(lightingShader.Program, "light.direction");
+        GLint lightSpotCutOffLoc      = glGetUniformLocation(lightingShader.Program, "light.cutOff");        
+        GLint lightSpotOuterCutOffLoc = glGetUniformLocation(lightingShader.Program, "light.outerCutOff");
+        GLint viewPosLoc              = glGetUniformLocation(lightingShader.Program, "viewPos");
+        glUniform3f(lightPosLoc,             camera.Position.x, camera.Position.y, camera.Position.z);
+        glUniform3f(lightSpotdirLoc,         camera.Front.x, camera.Front.y, camera.Front.z);
+        glUniform1f(lightSpotCutOffLoc,      glm::cos(glm::radians(12.5f)));
+        glUniform1f(lightSpotOuterCutOffLoc, glm::cos(glm::radians(17.5f)));
+        glUniform3f(viewPosLoc,              camera.Position.x, camera.Position.y, camera.Position.z);
+        // Set lights properties
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.ambient"),   0.1f, 0.1f, 0.1f);
+        // We set the diffuse intensity a bit higher; note that the right lighting conditions differ with each lighting method and environment.
+        // Each environment and lighting type requires some tweaking of these variables to get the best out of your environment.
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.diffuse"),   0.8f, 0.8f, 0.8f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "light.specular"),  1.0f, 1.0f, 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "light.constant"),  1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "light.linear"),    0.09);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "light.quadratic"), 0.032);
+        // Set material properties
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "material.shininess"), 32.0f);
+
+        // Create camera transformations
+        glm::mat4 view;
+        view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
+        // Get the uniform locations
+        GLint modelLoc = glGetUniformLocation(lightingShader.Program, "model");
+        GLint viewLoc  = glGetUniformLocation(lightingShader.Program, "view");
+        GLint projLoc  = glGetUniformLocation(lightingShader.Program, "projection");
+        // Pass the matrices to the shader
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+        // Bind diffuse map
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, diffuseMap);
+        // Bind specular map
+        glActiveTexture(GL_TEXTURE1);
+        glBindTexture(GL_TEXTURE_2D, specularMap);
+
+        // Draw the container (using container's vertex attributes)
+        /*glBindVertexArray(containerVAO);
+        glm::mat4 model;
+        glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+        glBindVertexArray(0);*/
+
+        // Draw 10 containers with the same VAO and VBO information; only their world space coordinates differ
+        glm::mat4 model;
+        glBindVertexArray(containerVAO);
+        for (GLuint i = 0; i < 10; i++)
+        {
+            model = glm::mat4();
+            model = glm::translate(model, cubePositions[i]);
+            GLfloat angle = 20.0f * i;
+            model = glm::rotate(model, angle, glm::vec3(1.0f, 0.3f, 0.5f));
+            glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+
+            glDrawArrays(GL_TRIANGLES, 0, 36);
+        }
+        glBindVertexArray(0);
+
+
+        // Again, no need to draw the lamp object
+        // Also draw the lamp object, again binding the appropriate shader
+        //lampShader.Use();
+        //// Get location objects for the matrices on the lamp shader (these could be different on a different shader)
+        //modelLoc = glGetUniformLocation(lampShader.Program, "model");
+        //viewLoc  = glGetUniformLocation(lampShader.Program, "view");
+        //projLoc  = glGetUniformLocation(lampShader.Program, "projection");
+        //// Set matrices
+        //glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        //glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+        //model = glm::mat4();
+        //model = glm::translate(model, lightPos);
+        //model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
+        //glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+        //// Draw the light object (using light's vertex attributes)
+        //glBindVertexArray(lightVAO);
+        //glDrawArrays(GL_TRIANGLES, 0, 36);
+        //glBindVertexArray(0);
+
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminate GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// 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;
+    }
+}
+
+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);
+}
+
+bool firstMouse = true;
+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;  // Reversed since y-coordinates go from bottom to left
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(yoffset);
+}

src/2.lighting/6.multiple_lights/lamp.frag

@@ -0,0 +1,7 @@
+#version 330 core
+out vec4 color;
+
+void main()
+{
+    color = vec4(1.0f); // Set alle 4 vector values to 1.0f
+}

src/2.lighting/6.multiple_lights/lamp.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(position, 1.0f);
+} 

src/2.lighting/6.multiple_lights/multiple_lights.cpp

@@ -0,0 +1,408 @@
+#include <iostream>
+#include <cmath>
+
+// GLEW
+#define GLEW_STATIC
+#include <GL/glew.h>
+
+// GLFW
+#include <GLFW/glfw3.h>
+
+// Other Libs
+#include <SOIL.h>
+// GLM Mathematics
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+// Other includes
+#include <learnopengl/shader.h>
+#include <learnopengl/camera.h>
+
+
+// Function prototypes
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
+void mouse_callback(GLFWwindow* window, double xpos, double ypos);
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
+void do_movement();
+
+// Window dimensions
+const GLuint WIDTH = 800, HEIGHT = 600;
+
+// Camera
+Camera  camera(glm::vec3(0.0f, 0.0f, 3.0f));
+GLfloat lastX  =  WIDTH  / 2.0;
+GLfloat lastY  =  HEIGHT / 2.0;
+bool    keys[1024];
+
+// Light attributes
+glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
+
+// Deltatime
+GLfloat deltaTime = 0.0f;	// Time between current frame and last frame
+GLfloat lastFrame = 0.0f;  	// Time of last frame
+
+// The MAIN function, from here we start the application and run the game loop
+int main()
+{
+    // Init GLFW
+    glfwInit();
+    // Set all the required options for GLFW
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
+
+    // Create a GLFWwindow object that we can use for GLFW's functions
+    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "LearnOpenGL", nullptr, nullptr);
+    glfwMakeContextCurrent(window);
+
+    // Set the required callback functions
+    glfwSetKeyCallback(window, key_callback);
+    glfwSetCursorPosCallback(window, mouse_callback);
+    glfwSetScrollCallback(window, scroll_callback);
+
+    // GLFW Options
+    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
+
+    // Set this to true so GLEW knows to use a modern approach to retrieving function pointers and extensions
+    glewExperimental = GL_TRUE;
+    // Initialize GLEW to setup the OpenGL Function pointers
+    glewInit();
+
+    // Define the viewport dimensions
+    glViewport(0, 0, WIDTH, HEIGHT);
+
+    // OpenGL options
+    glEnable(GL_DEPTH_TEST);
+
+
+    // Build and compile our shader program
+    Shader lightingShader("multiple_lights.vs", "multiple_lights.frag");
+    Shader lampShader("lamp.vs", "lamp.frag");
+
+    // Set up vertex data (and buffer(s)) and attribute pointers
+    GLfloat 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
+    };
+    // Positions all containers
+    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)
+    };
+    // Positions of the point lights
+    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)
+    };
+    // First, set the container's VAO (and VBO)
+    GLuint VBO, containerVAO;
+    glGenVertexArrays(1, &containerVAO);
+    glGenBuffers(1, &VBO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindVertexArray(containerVAO);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
+    glEnableVertexAttribArray(2);
+    glBindVertexArray(0);
+
+    // Then, we set the light's VAO (VBO stays the same. After all, the vertices are the same for the light object (also a 3D cube))
+    GLuint lightVAO;
+    glGenVertexArrays(1, &lightVAO);
+    glBindVertexArray(lightVAO);
+    // We only need to bind to the VBO (to link it with glVertexAttribPointer), no need to fill it; the VBO's data already contains all we need.
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    // Set the vertex attributes (only position data for the lamp))
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0); // Note that we skip over the other data in our buffer object (we don't need the normals/textures, only positions).
+    glEnableVertexAttribArray(0);
+    glBindVertexArray(0);
+    
+
+    // Load textures
+    GLuint diffuseMap, specularMap, emissionMap;
+    glGenTextures(1, &diffuseMap);
+    glGenTextures(1, &specularMap);
+    glGenTextures(1, &emissionMap);
+    int width, height;
+    unsigned char* image;
+    // Diffuse map
+    image = SOIL_load_image("../../../resources/textures/container2.png", &width, &height, 0, SOIL_LOAD_RGB);
+    glBindTexture(GL_TEXTURE_2D, diffuseMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    SOIL_free_image_data(image);
+    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_NEAREST_MIPMAP_NEAREST);
+    // Specular map
+    image = SOIL_load_image("../../../resources/textures/container2_specular.png", &width, &height, 0, SOIL_LOAD_RGB);
+    glBindTexture(GL_TEXTURE_2D, specularMap);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    SOIL_free_image_data(image);
+    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_NEAREST_MIPMAP_NEAREST);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+
+    // Set texture units
+    lightingShader.Use();
+    glUniform1i(glGetUniformLocation(lightingShader.Program, "material.diffuse"),  0);
+    glUniform1i(glGetUniformLocation(lightingShader.Program, "material.specular"), 1);
+
+
+    // Game loop
+    while (!glfwWindowShouldClose(window))
+    {
+        // Calculate deltatime of current frame
+        GLfloat currentFrame = glfwGetTime();
+        deltaTime = currentFrame - lastFrame;
+        lastFrame = currentFrame;
+
+        // Check if any events have been activiated (key pressed, mouse moved etc.) and call corresponding response functions
+        glfwPollEvents();
+        do_movement();
+
+        // Clear the colorbuffer
+        glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+
+        // Use cooresponding shader when setting uniforms/drawing objects
+        lightingShader.Use();
+        GLint viewPosLoc = glGetUniformLocation(lightingShader.Program, "viewPos");
+        glUniform3f(viewPosLoc, camera.Position.x, camera.Position.y, camera.Position.z);
+        // Set material properties
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "material.shininess"), 32.0f);
+        // == ==========================
+        // Here we set all the uniforms for the 5/6 types of lights we have. We have to set them manually and index 
+        // the proper PointLight struct in the array to set each uniform variable. This can be done more code-friendly
+        // by defining light types as classes and set their values in there, or by using a more efficient uniform approach
+        // by using 'Uniform buffer objects', but that is something we discuss in the 'Advanced GLSL' tutorial.
+        // == ==========================
+        // Directional light
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "dirLight.direction"), -0.2f, -1.0f, -0.3f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "dirLight.ambient"), 0.05f, 0.05f, 0.05f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "dirLight.diffuse"), 0.4f, 0.4f, 0.4f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "dirLight.specular"), 0.5f, 0.5f, 0.5f);
+        // Point light 1
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[0].position"), pointLightPositions[0].x, pointLightPositions[0].y, pointLightPositions[0].z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[0].ambient"), 0.05f, 0.05f, 0.05f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[0].diffuse"), 0.8f, 0.8f, 0.8f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[0].specular"), 1.0f, 1.0f, 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[0].constant"), 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[0].linear"), 0.09);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[0].quadratic"), 0.032);
+        // Point light 2
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[1].position"), pointLightPositions[1].x, pointLightPositions[1].y, pointLightPositions[1].z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[1].ambient"), 0.05f, 0.05f, 0.05f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[1].diffuse"), 0.8f, 0.8f, 0.8f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[1].specular"), 1.0f, 1.0f, 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[1].constant"), 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[1].linear"), 0.09);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[1].quadratic"), 0.032);
+        // Point light 3
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[2].position"), pointLightPositions[2].x, pointLightPositions[2].y, pointLightPositions[2].z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[2].ambient"), 0.05f, 0.05f, 0.05f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[2].diffuse"), 0.8f, 0.8f, 0.8f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[2].specular"), 1.0f, 1.0f, 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[2].constant"), 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[2].linear"), 0.09);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[2].quadratic"), 0.032);
+        // Point light 4
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[3].position"), pointLightPositions[3].x, pointLightPositions[3].y, pointLightPositions[3].z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[3].ambient"), 0.05f, 0.05f, 0.05f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[3].diffuse"), 0.8f, 0.8f, 0.8f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "pointLights[3].specular"), 1.0f, 1.0f, 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[3].constant"), 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[3].linear"), 0.09);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "pointLights[3].quadratic"), 0.032);
+        // SpotLight
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "spotLight.position"), camera.Position.x, camera.Position.y, camera.Position.z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "spotLight.direction"), camera.Front.x, camera.Front.y, camera.Front.z);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "spotLight.ambient"), 0.0f, 0.0f, 0.0f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "spotLight.diffuse"), 1.0f, 1.0f, 1.0f);
+        glUniform3f(glGetUniformLocation(lightingShader.Program, "spotLight.specular"), 1.0f, 1.0f, 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "spotLight.constant"), 1.0f);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "spotLight.linear"), 0.09);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "spotLight.quadratic"), 0.032);
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "spotLight.cutOff"), glm::cos(glm::radians(12.5f)));
+        glUniform1f(glGetUniformLocation(lightingShader.Program, "spotLight.outerCutOff"), glm::cos(glm::radians(15.0f)));
+
+        // Create camera transformations
+        glm::mat4 view;
+        view = camera.GetViewMatrix();
+        glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)WIDTH / (GLfloat)HEIGHT, 0.1f, 100.0f);
+        // Get the uniform locations
+        GLint modelLoc = glGetUniformLocation(lightingShader.Program, "model");
+        GLint viewLoc  = glGetUniformLocation(lightingShader.Program, "view");
+        GLint projLoc  = glGetUniformLocation(lightingShader.Program, "projection");
+        // Pass the matrices to the shader
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+
+        // Bind diffuse map
+        glActiveTexture(GL_TEXTURE0);
+        glBindTexture(GL_TEXTURE_2D, diffuseMap);
+        // Bind specular map
+        glActiveTexture(GL_TEXTURE1);
+        glBindTexture(GL_TEXTURE_2D, specularMap);
+
+        // Draw 10 containers with the same VAO and VBO information; only their world space coordinates differ
+        glm::mat4 model;
+        glBindVertexArray(containerVAO);
+        for (GLuint i = 0; i < 10; i++)
+        {
+            model = glm::mat4();
+            model = glm::translate(model, cubePositions[i]);
+            GLfloat angle = 20.0f * i;
+            model = glm::rotate(model, angle, glm::vec3(1.0f, 0.3f, 0.5f));
+            glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+
+            glDrawArrays(GL_TRIANGLES, 0, 36);
+        }
+        glBindVertexArray(0);
+
+
+        // Also draw the lamp object, again binding the appropriate shader
+        lampShader.Use();
+        // Get location objects for the matrices on the lamp shader (these could be different on a different shader)
+        modelLoc = glGetUniformLocation(lampShader.Program, "model");
+        viewLoc  = glGetUniformLocation(lampShader.Program, "view");
+        projLoc  = glGetUniformLocation(lampShader.Program, "projection");
+        // Set matrices
+        glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+        glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(projection));
+        
+        // We now draw as many light bulbs as we have point lights.
+        glBindVertexArray(lightVAO);
+        for (GLuint i = 0; i < 4; i++)
+        {
+            model = glm::mat4();
+            model = glm::translate(model, pointLightPositions[i]);
+            model = glm::scale(model, glm::vec3(0.2f)); // Make it a smaller cube
+            glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
+            glDrawArrays(GL_TRIANGLES, 0, 36);
+        }
+        glBindVertexArray(0);
+
+
+        // Swap the screen buffers
+        glfwSwapBuffers(window);
+    }
+
+    // Terminate GLFW, clearing any resources allocated by GLFW.
+    glfwTerminate();
+    return 0;
+}
+
+// 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;
+    }
+}
+
+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);
+}
+
+bool firstMouse = true;
+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;  // Reversed since y-coordinates go from bottom to left
+
+    lastX = xpos;
+    lastY = ypos;
+
+    camera.ProcessMouseMovement(xoffset, yoffset);
+}
+
+void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    camera.ProcessMouseScroll(yoffset);
+}

src/2.lighting/6.multiple_lights/multiple_lights.frag

@@ -0,0 +1,147 @@
+#version 330 core
+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 4
+
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+out vec4 color;
+
+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()
+{    
+    // Properties
+    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 lighting
+    vec3 result = CalcDirLight(dirLight, norm, viewDir);
+    // Phase 2: Point lights
+    for(int i = 0; i < NR_POINT_LIGHTS; i++)
+        result += CalcPointLight(pointLights[i], norm, FragPos, viewDir);    
+    // Phase 3: Spot light
+    result += CalcSpotLight(spotLight, norm, FragPos, viewDir);    
+    
+    color = vec4(result, 1.0);
+}
+
+// Calculates the color when using a directional light.
+vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir)
+{
+    vec3 lightDir = normalize(-light.direction);
+    // Diffuse shading
+    float diff = max(dot(normal, lightDir), 0.0);
+    // Specular shading
+    vec3 reflectDir = reflect(-lightDir, normal);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    // Combine results
+    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);
+}
+
+// Calculates the color when using a point light.
+vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+    vec3 lightDir = normalize(light.position - fragPos);
+    // Diffuse shading
+    float diff = max(dot(normal, lightDir), 0.0);
+    // Specular shading
+    vec3 reflectDir = reflect(-lightDir, normal);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    // Attenuation
+    float distance = length(light.position - fragPos);
+    float attenuation = 1.0f / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    
+    // Combine results
+    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);
+}
+
+// Calculates the color when using a spot light.
+vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+    vec3 lightDir = normalize(light.position - fragPos);
+    // Diffuse shading
+    float diff = max(dot(normal, lightDir), 0.0);
+    // Specular shading
+    vec3 reflectDir = reflect(-lightDir, normal);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+    // Attenuation
+    float distance = length(light.position - fragPos);
+    float attenuation = 1.0f / (light.constant + light.linear * distance + light.quadratic * (distance * distance));    
+    // Spotlight intensity
+    float theta = dot(lightDir, normalize(-light.direction)); 
+    float epsilon = light.cutOff - light.outerCutOff;
+    float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
+    // Combine results
+    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 * intensity;
+    diffuse *= attenuation * intensity;
+    specular *= attenuation * intensity;
+    return (ambient + diffuse + specular);
+}

src/2.lighting/6.multiple_lights/multiple_lights.vs

@@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 position;
+layout (location = 1) in vec3 normal;
+layout (location = 2) in vec2 texCoords;
+
+out vec3 Normal;
+out vec3 FragPos;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view *  model * vec4(position, 1.0f);
+    FragPos = vec3(model * vec4(position, 1.0f));
+    Normal = mat3(transpose(inverse(model))) * normal;  
+    TexCoords = texCoords;
+}