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TheRetikGM
2021-02-12 15:43:03 +01:00
commit 63e3c0bc8b
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37
lessons/2. Lighting/1. Colors/Makefile Normal file
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NAME := main
CXX=g++
DEBUG :=
CXX_FLAGS := $(DEBUG) -std=c++14
LIBS := -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -pthread -lXi -ldl -lm
INCLUDE := ../../../include/
BIN := bin
SRC := src
INPUT = src/main.cpp ../../../glad.c
all: $(BIN)/$(NAME)
run:
cd $(BIN) && ./$(NAME)
$(BIN)/$(NAME): $(SRC)/main.o $(SRC)/glad.o $(SRC)/Shader.o $(SRC)/stb_image.o $(SRC)/Camera.o
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@ $(LIBS)
.cpp.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
.c.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/glad.o: ../../../glad.c
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/stb_image.o: ../../../stb_image.cpp
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
# dependencies
$(SRC)/main.o: $(SRC)/main.cpp
$(SRC)/Shader.o: $(SRC)/Shader.cpp
clean:
rm -rf $(SRC)/*.o
touch $(SRC)/*

83
lessons/2. Lighting/1. Colors/src/Camera.cpp Normal file
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#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
Camera::Camera(glm::vec3 position, glm::vec3 worldUp, glm::vec3 worldFront, float yaw, float pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(2.5f), MouseSensitivity(0.001f), FOV(45.0f), Mode(CAM_FLOAT)
{
this->Position = position;
this->WorldUp = worldUp;
this->Yaw = yaw;
this->Pitch = pitch;
this->WorldFront = worldFront;
this->WorldRight = glm::normalize(glm::cross(this->WorldFront, this->WorldUp));
updateCameraVectors();
}
void Camera::updateCameraVectors()
{
glm::vec3 front;
front.x = cos(Yaw) * cos(Pitch);
front.y = sin(Pitch);
front.z = sin(Yaw) * cos(Pitch);
Front = glm::normalize(front);
Right = glm::normalize(glm::cross(Front, WorldUp));
Up = glm::normalize(glm::cross(Right, Front));
}
glm::mat4 Camera::getViewMatrix()
{
return glm::lookAt(Position, Position + Front, WorldUp);
}
void Camera::ProccessKeyboard(camera_movement direction, float deltaTime)
{
switch (direction)
{
case CAM_FORWARD:
Position += deltaTime * Front;
break;
case CAM_BACKWARD:
Position -= deltaTime * Front;
break;
case CAM_LEFT:
Position -= deltaTime * Right;
break;
case CAM_RIGHT:
Position += deltaTime * Right;
break;
case CAM_UP:
Position += deltaTime * WorldUp;
break;
case CAM_DOWN:
Position -= deltaTime * WorldUp;
break;
}
}
void Camera::ProccessMouse(float xoffset, float yoffset, bool constrainPitch)
{
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw = fmodf(Yaw + xoffset, 360.0f);
Pitch += yoffset;
if (constrainPitch)
{
if (Pitch > 89.0f)
Pitch = 89.0f;
else if (Pitch < -89.0f)
Pitch = -89.0f;
}
updateCameraVectors();
}
void Camera::ProccessScroll(float yoffset)
{
FOV -= yoffset;
if (FOV < 1.0f)
FOV = 1.0f;
else if (FOV > 45.0f)
FOV = 45.0f;
}
void Camera::SetCameraMode(camera_mode mode)
{
Mode = mode;
}

54
lessons/2. Lighting/1. Colors/src/Camera.h Normal file
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#pragma once
#include <glm/glm.hpp>
enum camera_movement {
CAM_FORWARD,
CAM_BACKWARD,
CAM_LEFT,
CAM_RIGHT,
CAM_UP,
CAM_DOWN
};
enum camera_mode {
CAM_FLOAT,
CAM_MINECRAFT
};
class Camera
{
public:
float FOV;
float MovementSpeed;
float MouseSensitivity;
float Yaw; // vlevo vpravo
float Pitch; // nahoru dolu
camera_mode Mode;
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Right;
glm::vec3 Up;
glm::vec3 WorldUp;
glm::vec3 WorldRight;
glm::vec3 WorldFront;
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 worldUp = glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3 worldFront = glm::vec3(0.0f, 0.0f, -1.0),
float yaw = -90.0f, float pitch = 0);
glm::mat4 getViewMatrix();
void ProccessKeyboard(camera_movement direction, float deltaTime);
void ProccessMouse(float xoffset, float yoffset, bool constrainPitch = true);
void ProccessScroll(float yoffset);
void SetCameraMode(camera_mode mode);
private:
float lastY;
float lastX;
void updateCameraVectors();
};

100
lessons/2. Lighting/1. Colors/src/Shader.cpp Normal file
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#include "Shader.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <glad/glad.h>
#include <glm/gtc/type_ptr.hpp>
Shader::Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath)
{
std::string v = readFile(vertexShaderSourcePath);
std::string f = readFile(fragmentShaderSourcePath);
const char *vertexSource = v.c_str();
const char *fragmentSource = f.c_str();
int success;
char infoLog[512];
unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Vertex shader compilation failed!\n" << infoLog << std::endl;
}
unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Fragment shader compilation failed!\n" << infoLog << std::endl;
}
Program = glCreateProgram();
glAttachShader(Program, vertexShader);
glAttachShader(Program, fragmentShader);
glLinkProgram(Program);
glGetProgramiv(Program, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(Program, 512, NULL, infoLog);
std::cerr << "[ERROR] Program linking failed\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
Shader::Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath)
{
Shader(vertexShaderSourcePath.c_str(), fragmentShaderSourcePath.c_str());
}
std::string Shader::readFile(const char* path)
{
std::string out;
try
{
std::ifstream ifs(path); // input file stream
std::stringstream buffer;
buffer << ifs.rdbuf();
out = buffer.str();
}
catch (std::ifstream::failure e)
{
std::cerr << "[ERROR] Could not read/open file '" << path << "'\n";
}
return out;
}
void Shader::Use()
{
glUseProgram(Program);
}
void Shader::setBool(const std::string name, bool value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value ? 1 : 0);
}
void Shader::setFloat(const std::string name, float value) const
{
glUniform1f(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setInt(const std::string name, int value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setMat4(const std::string name, glm::mat4 value) const
{
glUniformMatrix4fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}
void Shader::setVec3(const std::string name, glm::vec3 value) const
{
setVec3(name, value.x, value.y, value.z);
}
void Shader::setVec3(const std::string name, float v0, float v1, float v2) const
{
glUniform3f(glGetUniformLocation(Program, name.c_str()), v0, v1, v2);
}

24
lessons/2. Lighting/1. Colors/src/Shader.h Normal file
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#pragma once
#include <string>
#include <glm/glm.hpp>
class Shader
{
public:
unsigned int Program;
Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath);
Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath);
void Use();
void setBool(const std::string name, bool value) const;
void setFloat(const std::string name, float value) const;
void setInt(const std::string name, int value) const;
void setMat4(const std::string name, glm::mat4 value) const;
void setVec3(const std::string name, glm::vec3 value) const;
void setVec3(const std::string name, float v0, float v1, float v2) const;
private:
std::string readFile(const char* path);
};

278
lessons/2. Lighting/1. Colors/src/main.cpp Normal file
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "Shader.h"
#include "Camera.h"
#define TEXTURES_DIR "../../../../textures/"
#define SHADERS_DIR "../src/shaders/"
using namespace std;
typedef unsigned int uint;
// Global Constants
// ...
// Global Variables
GLFWwindow* window;
int WINDOW_WIDTH = 800;
int WINDOW_HEIGHT = 600;
Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
float deltaTime = 0.0f;
float lastFrame = 0.0f;
float lastX = 400;
float lastY = 300;
bool firstmouse = true;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
uint8_t init(void);
void framebuffersize_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void proccessInput(GLFWwindow* window);
unsigned int load_texture(const char* path, bool flip = true);
int main(int* argc, char** argv)
{
if (init() != 0)
return -1;
Shader lightingShader(SHADERS_DIR "vertexShader.vert", SHADERS_DIR "fragmentShader.frag");
Shader lightSourceShader(SHADERS_DIR "lightSource.vert", SHADERS_DIR "lightSource.frag");
float vertices[] = {
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
uint cubeVAO; // Vertex array buffer
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);
uint VBO; // Vertex Buffer Object
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); // copy data to Graphics card array buffer (buffer for vertices)
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glBindVertexArray(0);
uint lightSourceVAO;
glGenVertexArrays(1, &lightSourceVAO);
glBindVertexArray(lightSourceVAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
glEnable(GL_DEPTH_TEST);
/* ------------------ MAIN loop ------------------ */
while (!glfwWindowShouldClose(window)) {
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
lastFrame = currentFrame; // cas kdy zacal tento frame
// input ...
proccessInput(window);
// rendering commands here ...
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 model(1.0f);
model = glm::translate(model, glm::vec3(0.0f));
glm::mat4 view = myCamera.getViewMatrix();
glm::mat4 projection(1.0f);
projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
lightingShader.Use();
lightingShader.setMat4("model", model);
lightingShader.setMat4("view", view);
lightingShader.setMat4("projection", projection);
lightingShader.setVec3("objectColor", 1.0f, 0.5f, 0.31f); // color the object reflects
lightingShader.setVec3("lightColor", lightColor); // color of the light source
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
/* ----------- Light Source ----------- */
model = glm::mat4(1.0f);
model = glm::translate(model, lightPos);
model = glm::scale(model, glm::vec3(0.2f));
lightSourceShader.Use();
glm::mat4 PVM = projection * view * model;
lightSourceShader.setMat4("PVM", PVM);
lightSourceShader.setVec3("lightColor", lightColor);
glBindVertexArray(lightSourceVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
// check and calls events and swap the buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &lightSourceVAO);
glDeleteVertexArrays(1, &cubeVAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();
return 0;
}
uint8_t init(void) {
// init of glfw window
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "1. Colors", NULL, NULL);
if (window == NULL) {
cerr << "Failed to create glfw window" << endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// init of GLAD
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
cerr << "Failed to initialize GLAD" << endl;
}
glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
return 0;
}
void framebuffersize_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
WINDOW_HEIGHT = height;
WINDOW_WIDTH = width;
}
void proccessInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* -------------------- Movement -------------------- */
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_UP, deltaTime);
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstmouse) {
lastX = xpos;
lastY = ypos;
firstmouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
myCamera.ProccessMouse(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
myCamera.ProccessScroll(yoffset);
}
unsigned int load_texture(const char* path, bool flip)
{
unsigned int texture = 0;
int width, height, nrChannels, format;
stbi_set_flip_vertically_on_load(flip);
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
switch (nrChannels)
{
case 4: format = GL_RGBA; break;
case 3: format = GL_RGB; break;
case 2: format = GL_RED; break;
default: format = GL_RGB; break;
}
if (data) // data != NULL
{
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
cerr << "Could not load texture '" << path << "'\n";
}
stbi_image_free(data);
return texture;
}

11
lessons/2. Lighting/1. Colors/src/shaders/fragmentShader.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 objectColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor * objectColor, 1.0f);
}

10
lessons/2. Lighting/1. Colors/src/shaders/lightSource.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0f);
}

10
lessons/2. Lighting/1. Colors/src/shaders/lightSource.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 PVM;
void main()
{
gl_Position = PVM * vec4(aPos.xyz, 1.0);
}

12
lessons/2. Lighting/1. Colors/src/shaders/vertexShader.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
}

37
lessons/2. Lighting/2. Basic Lighting/Makefile Normal file
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NAME := main
CXX=g++
DEBUG :=
CXX_FLAGS := $(DEBUG) -std=c++14
LIBS := -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -pthread -lXi -ldl -lm
INCLUDE := ../../../include/
BIN := bin
SRC := src
INPUT = src/main.cpp ../../../glad.c
all: $(BIN)/$(NAME)
run:
cd $(BIN) && ./$(NAME)
$(BIN)/$(NAME): $(SRC)/main.o $(SRC)/glad.o $(SRC)/Shader.o $(SRC)/stb_image.o $(SRC)/Camera.o
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@ $(LIBS)
.cpp.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
.c.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/glad.o: ../../../glad.c
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/stb_image.o: ../../../stb_image.cpp
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
# dependencies
$(SRC)/main.o: $(SRC)/main.cpp
$(SRC)/Shader.o: $(SRC)/Shader.cpp
clean:
rm -rf $(SRC)/*.o
touch $(SRC)/*

83
lessons/2. Lighting/2. Basic Lighting/src/Camera.cpp Normal file
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#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
Camera::Camera(glm::vec3 position, glm::vec3 worldUp, glm::vec3 worldFront, float yaw, float pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(2.5f), MouseSensitivity(0.001f), FOV(45.0f), Mode(CAM_FLOAT)
{
this->Position = position;
this->WorldUp = worldUp;
this->Yaw = yaw;
this->Pitch = pitch;
this->WorldFront = worldFront;
this->WorldRight = glm::normalize(glm::cross(this->WorldFront, this->WorldUp));
updateCameraVectors();
}
void Camera::updateCameraVectors()
{
glm::vec3 front;
front.x = cos(Yaw) * cos(Pitch);
front.y = sin(Pitch);
front.z = sin(Yaw) * cos(Pitch);
Front = glm::normalize(front);
Right = glm::normalize(glm::cross(Front, WorldUp));
Up = glm::normalize(glm::cross(Right, Front));
}
glm::mat4 Camera::getViewMatrix()
{
return glm::lookAt(Position, Position + Front, WorldUp);
}
void Camera::ProccessKeyboard(camera_movement direction, float deltaTime)
{
switch (direction)
{
case CAM_FORWARD:
Position += deltaTime * Front;
break;
case CAM_BACKWARD:
Position -= deltaTime * Front;
break;
case CAM_LEFT:
Position -= deltaTime * Right;
break;
case CAM_RIGHT:
Position += deltaTime * Right;
break;
case CAM_UP:
Position += deltaTime * WorldUp;
break;
case CAM_DOWN:
Position -= deltaTime * WorldUp;
break;
}
}
void Camera::ProccessMouse(float xoffset, float yoffset, bool constrainPitch)
{
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw = fmodf(Yaw + xoffset, 360.0f);
Pitch += yoffset;
if (constrainPitch)
{
if (Pitch > 89.0f)
Pitch = 89.0f;
else if (Pitch < -89.0f)
Pitch = -89.0f;
}
updateCameraVectors();
}
void Camera::ProccessScroll(float yoffset)
{
FOV -= yoffset;
if (FOV < 1.0f)
FOV = 1.0f;
else if (FOV > 45.0f)
FOV = 45.0f;
}
void Camera::SetCameraMode(camera_mode mode)
{
Mode = mode;
}

54
lessons/2. Lighting/2. Basic Lighting/src/Camera.h Normal file
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#pragma once
#include <glm/glm.hpp>
enum camera_movement {
CAM_FORWARD,
CAM_BACKWARD,
CAM_LEFT,
CAM_RIGHT,
CAM_UP,
CAM_DOWN
};
enum camera_mode {
CAM_FLOAT,
CAM_MINECRAFT
};
class Camera
{
public:
float FOV;
float MovementSpeed;
float MouseSensitivity;
float Yaw; // vlevo vpravo
float Pitch; // nahoru dolu
camera_mode Mode;
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Right;
glm::vec3 Up;
glm::vec3 WorldUp;
glm::vec3 WorldRight;
glm::vec3 WorldFront;
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 worldUp = glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3 worldFront = glm::vec3(0.0f, 0.0f, -1.0),
float yaw = -90.0f, float pitch = 0);
glm::mat4 getViewMatrix();
void ProccessKeyboard(camera_movement direction, float deltaTime);
void ProccessMouse(float xoffset, float yoffset, bool constrainPitch = true);
void ProccessScroll(float yoffset);
void SetCameraMode(camera_mode mode);
private:
float lastY;
float lastX;
void updateCameraVectors();
};

119
lessons/2. Lighting/2. Basic Lighting/src/Shader.cpp Normal file
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#include "Shader.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <glad/glad.h>
#include <glm/gtc/type_ptr.hpp>
Shader::Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource)
{
const char* vertexSource;
const char* fragmentSource;
std::string v, f;
if (!directSource)
{
v = readFile(vertexShaderSourcePath);
f = readFile(fragmentShaderSourcePath);
vertexSource = v.c_str();
fragmentSource = f.c_str();
}
else
{
vertexSource = vertexShaderSourcePath;
fragmentSource = fragmentShaderSourcePath;
}
int success;
char infoLog[512];
unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Vertex shader compilation failed!\n" << infoLog << std::endl;
}
unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Fragment shader compilation failed!\n" << infoLog << std::endl;
}
Program = glCreateProgram();
glAttachShader(Program, vertexShader);
glAttachShader(Program, fragmentShader);
glLinkProgram(Program);
glGetProgramiv(Program, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(Program, 512, NULL, infoLog);
std::cerr << "[ERROR] Program linking failed\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
Shader::Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource)
{
Shader(vertexShaderSourcePath.c_str(), fragmentShaderSourcePath.c_str(), directSource);
}
Shader::~Shader()
{
glDeleteProgram(Program);
}
std::string Shader::readFile(const char* path)
{
std::string out;
try
{
std::ifstream ifs(path); // input file stream
std::stringstream buffer;
buffer << ifs.rdbuf();
out = buffer.str();
}
catch (std::ifstream::failure e)
{
std::cerr << "[ERROR] Could not read/open file '" << path << "'\n";
}
return out;
}
void Shader::Use()
{
glUseProgram(Program);
}
void Shader::setBool(const std::string name, bool value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value ? 1 : 0);
}
void Shader::setFloat(const std::string name, float value) const
{
glUniform1f(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setInt(const std::string name, int value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setMat4(const std::string name, glm::mat4 value) const
{
glUniformMatrix4fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}
void Shader::setVec3(const std::string name, glm::vec3 value) const
{
setVec3(name, value.x, value.y, value.z);
}
void Shader::setVec3(const std::string name, float v0, float v1, float v2) const
{
glUniform3f(glGetUniformLocation(Program, name.c_str()), v0, v1, v2);
}
void Shader::setMat3(const std::string name, glm::mat3 value) const
{
glUniformMatrix3fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}

27
lessons/2. Lighting/2. Basic Lighting/src/Shader.h Normal file
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#pragma once
#include <string>
#include <glm/glm.hpp>
class Shader
{
public:
unsigned int Program;
Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource = false);
Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource = false);
~Shader();
void Use();
void setBool(const std::string name, bool value) const;
void setFloat(const std::string name, float value) const;
void setInt(const std::string name, int value) const;
void setMat4(const std::string name, glm::mat4 value) const;
void setVec3(const std::string name, glm::vec3 value) const;
void setVec3(const std::string name, float v0, float v1, float v2) const;
void setMat3(const std::string name, glm::mat3 value) const;
static std::string readFile(const char* path);
};

288
lessons/2. Lighting/2. Basic Lighting/src/main.cpp Normal file
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "Shader.h"
#include "Camera.h"
//#include <DebugDrawer.h>
#define TEXTURES_DIR "../../../../textures/"
#define SHADERS_DIR "../src/shaders/"
using namespace std;
typedef unsigned int uint;
// Global Constants
// ...
// Global Variables
GLFWwindow* window;
int WINDOW_WIDTH = 800;
int WINDOW_HEIGHT = 600;
Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
float deltaTime = 0.0f;
float lastFrame = 0.0f;
float lastX = 400;
float lastY = 300;
bool firstmouse = true;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
uint8_t init(void);
void framebuffersize_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void proccessInput(GLFWwindow* window);
unsigned int load_texture(const char* path, bool flip = true);
int main(int* argc, char** argv)
{
if (init() != 0)
return -1;
// DebugDrawer debugDrawer;
Shader lightingShader(SHADERS_DIR "vertexShader.vert", SHADERS_DIR "fragmentShader.frag");
Shader lightSourceShader(SHADERS_DIR "lightSource.vert", SHADERS_DIR "lightSource.frag");
float 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
};
uint cubeVAO; // Vertex array buffer
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);
uint VBO; // Vertex Buffer Object
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); // copy data to Graphics card array buffer (buffer for vertices)
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glBindVertexArray(0);
uint lightSourceVAO;
glGenVertexArrays(1, &lightSourceVAO);
glBindVertexArray(lightSourceVAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
glEnable(GL_DEPTH_TEST);
/* ------------------ MAIN loop ------------------ */
while (!glfwWindowShouldClose(window)) {
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
lastFrame = currentFrame; // cas kdy zacal tento frame
// input ...
proccessInput(window);
// rendering commands here ...
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 model(1.0f);
model = glm::translate(model, glm::vec3(0.0f));
glm::mat4 view = myCamera.getViewMatrix();
glm::mat4 projection(1.0f);
projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
glm::mat3 normalMatrix = glm::transpose(glm::inverse(model));
lightingShader.Use();
lightingShader.setMat4("model", model);
lightingShader.setMat4("view", view);
lightingShader.setMat4("projection", projection);
lightingShader.setMat3("normalMatrix", normalMatrix);
lightPos.x = cos(glfwGetTime() * 0.5) * 3.0f;
lightPos.z = sin(glfwGetTime() * 0.5) * 3.0f;
lightingShader.setVec3("objectColor", 1.0f, 0.5f, 0.31f); // color the object reflects
lightingShader.setVec3("lightColor", lightColor); // color of the light source
lightingShader.setVec3("lightPos", lightPos);
lightingShader.setVec3("viewPos", myCamera.Position);
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
/* ----------- Light Source ----------- */
model = glm::mat4(1.0f);
model = glm::translate(model, lightPos);
model = glm::scale(model, glm::vec3(0.2f));
lightSourceShader.Use();
glm::mat4 PVM = projection * view * model;
lightSourceShader.setMat4("PVM", PVM);
lightSourceShader.setVec3("lightColor", lightColor);
glBindVertexArray(lightSourceVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
// debugDrawer.DrawCoordLines(projection * view);
// check and calls events and swap the buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &lightSourceVAO);
glDeleteVertexArrays(1, &cubeVAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();
return 0;
}
uint8_t init(void) {
// init of glfw window
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "1. Colors", NULL, NULL);
if (window == NULL) {
cerr << "Failed to create glfw window" << endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// init of GLAD
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
cerr << "Failed to initialize GLAD" << endl;
}
glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
return 0;
}
void framebuffersize_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
WINDOW_HEIGHT = height;
WINDOW_WIDTH = width;
}
void proccessInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* -------------------- Movement -------------------- */
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_UP, deltaTime);
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstmouse) {
lastX = xpos;
lastY = ypos;
firstmouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
myCamera.ProccessMouse(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
myCamera.ProccessScroll(yoffset);
}
unsigned int load_texture(const char* path, bool flip)
{
unsigned int texture = 0;
int width, height, nrChannels, format;
stbi_set_flip_vertically_on_load(flip);
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
switch (nrChannels)
{
case 4: format = GL_RGBA; break;
case 3: format = GL_RGB; break;
case 2: format = GL_RED; break;
default: format = GL_RGB; break;
}
if (data) // data != NULL
{
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
cerr << "Could not load texture '" << path << "'\n";
}
stbi_image_free(data);
return texture;
}

32
lessons/2. Lighting/2. Basic Lighting/src/shaders/fragmentShader.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 objectColor;
uniform vec3 lightColor;
uniform vec3 lightPos;
uniform vec3 viewPos;
in vec3 Normal;
in vec3 FragPos;
void main()
{
vec3 lightDir = normalize(lightPos - FragPos); // direction towards light source
vec3 normal = normalize(Normal);
float ambientStrength = 0.1;
vec3 ambient = ambientStrength * lightColor;
float diff = max(dot(lightDir, normal), 0.0f);
vec3 diffuse = diff * objectColor;
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(normalize(viewPos - FragPos), reflectDir), 0.0), 32.0);
float specularStrength = 0.5;
vec3 specular = specularStrength * spec * objectColor;
vec3 result = (ambient + diffuse + specular) * objectColor;
FragColor = vec4(result, 1.0f);
}

10
lessons/2. Lighting/2. Basic Lighting/src/shaders/lightSource.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0f);
}

10
lessons/2. Lighting/2. Basic Lighting/src/shaders/lightSource.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 PVM;
void main()
{
gl_Position = PVM * vec4(aPos.xyz, 1.0);
}

19
lessons/2. Lighting/2. Basic Lighting/src/shaders/vertexShader.vert Normal file
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@@ -0,0 +1,19 @@
#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
uniform mat3 normalMatrix;
out vec3 Normal;
out vec3 FragPos;
void main()
{
gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
Normal = normalMatrix * aNormal;
FragPos = vec3(model * vec4(aPos, 1.0));
}

37
lessons/2. Lighting/3. Materials/Makefile Normal file
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NAME := main
CXX=g++
DEBUG :=
CXX_FLAGS := $(DEBUG) -std=c++14
LIBS := -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -pthread -lXi -ldl -lm
INCLUDE := ../../../include/
BIN := bin
SRC := src
INPUT = src/main.cpp ../../../glad.c
all: $(BIN)/$(NAME)
run:
cd $(BIN) && ./$(NAME)
$(BIN)/$(NAME): $(SRC)/main.o $(SRC)/glad.o $(SRC)/Shader.o $(SRC)/stb_image.o $(SRC)/Camera.o
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@ $(LIBS)
.cpp.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
.c.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/glad.o: ../../../glad.c
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/stb_image.o: ../../../stb_image.cpp
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
# dependencies
$(SRC)/main.o: $(SRC)/main.cpp
$(SRC)/Shader.o: $(SRC)/Shader.cpp
clean:
rm -rf $(SRC)/*.o
touch $(SRC)/*

83
lessons/2. Lighting/3. Materials/src/Camera.cpp Normal file
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#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
Camera::Camera(glm::vec3 position, glm::vec3 worldUp, glm::vec3 worldFront, float yaw, float pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(2.5f), MouseSensitivity(0.001f), FOV(45.0f), Mode(CAM_FLOAT)
{
this->Position = position;
this->WorldUp = worldUp;
this->Yaw = yaw;
this->Pitch = pitch;
this->WorldFront = worldFront;
this->WorldRight = glm::normalize(glm::cross(this->WorldFront, this->WorldUp));
updateCameraVectors();
}
void Camera::updateCameraVectors()
{
glm::vec3 front;
front.x = cos(Yaw) * cos(Pitch);
front.y = sin(Pitch);
front.z = sin(Yaw) * cos(Pitch);
Front = glm::normalize(front);
Right = glm::normalize(glm::cross(Front, WorldUp));
Up = glm::normalize(glm::cross(Right, Front));
}
glm::mat4 Camera::getViewMatrix()
{
return glm::lookAt(Position, Position + Front, WorldUp);
}
void Camera::ProccessKeyboard(camera_movement direction, float deltaTime)
{
switch (direction)
{
case CAM_FORWARD:
Position += deltaTime * Front;
break;
case CAM_BACKWARD:
Position -= deltaTime * Front;
break;
case CAM_LEFT:
Position -= deltaTime * Right;
break;
case CAM_RIGHT:
Position += deltaTime * Right;
break;
case CAM_UP:
Position += deltaTime * WorldUp;
break;
case CAM_DOWN:
Position -= deltaTime * WorldUp;
break;
}
}
void Camera::ProccessMouse(float xoffset, float yoffset, bool constrainPitch)
{
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw = fmodf(Yaw + xoffset, 360.0f);
Pitch += yoffset;
if (constrainPitch)
{
if (Pitch > 89.0f)
Pitch = 89.0f;
else if (Pitch < -89.0f)
Pitch = -89.0f;
}
updateCameraVectors();
}
void Camera::ProccessScroll(float yoffset)
{
FOV -= yoffset;
if (FOV < 1.0f)
FOV = 1.0f;
else if (FOV > 45.0f)
FOV = 45.0f;
}
void Camera::SetCameraMode(camera_mode mode)
{
Mode = mode;
}

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lessons/2. Lighting/3. Materials/src/Camera.h Normal file
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#pragma once
#include <glm/glm.hpp>
enum camera_movement {
CAM_FORWARD,
CAM_BACKWARD,
CAM_LEFT,
CAM_RIGHT,
CAM_UP,
CAM_DOWN
};
enum camera_mode {
CAM_FLOAT,
CAM_MINECRAFT
};
class Camera
{
public:
float FOV;
float MovementSpeed;
float MouseSensitivity;
float Yaw; // vlevo vpravo
float Pitch; // nahoru dolu
camera_mode Mode;
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Right;
glm::vec3 Up;
glm::vec3 WorldUp;
glm::vec3 WorldRight;
glm::vec3 WorldFront;
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 worldUp = glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3 worldFront = glm::vec3(0.0f, 0.0f, -1.0),
float yaw = -90.0f, float pitch = 0);
glm::mat4 getViewMatrix();
void ProccessKeyboard(camera_movement direction, float deltaTime);
void ProccessMouse(float xoffset, float yoffset, bool constrainPitch = true);
void ProccessScroll(float yoffset);
void SetCameraMode(camera_mode mode);
private:
float lastY;
float lastX;
void updateCameraVectors();
};

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lessons/2. Lighting/3. Materials/src/Shader.cpp Normal file
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#include "Shader.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <glad/glad.h>
#include <glm/gtc/type_ptr.hpp>
Shader::Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource)
{
const char* vertexSource;
const char* fragmentSource;
std::string v, f;
if (!directSource)
{
v = readFile(vertexShaderSourcePath);
f = readFile(fragmentShaderSourcePath);
vertexSource = v.c_str();
fragmentSource = f.c_str();
}
else
{
vertexSource = vertexShaderSourcePath;
fragmentSource = fragmentShaderSourcePath;
}
int success;
char infoLog[512];
unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Vertex shader compilation failed!\n" << infoLog << std::endl;
}
unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Fragment shader compilation failed!\n" << infoLog << std::endl;
}
Program = glCreateProgram();
glAttachShader(Program, vertexShader);
glAttachShader(Program, fragmentShader);
glLinkProgram(Program);
glGetProgramiv(Program, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(Program, 512, NULL, infoLog);
std::cerr << "[ERROR] Program linking failed\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
Shader::Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource)
{
Shader(vertexShaderSourcePath.c_str(), fragmentShaderSourcePath.c_str(), directSource);
}
Shader::~Shader()
{
glDeleteProgram(Program);
}
std::string Shader::readFile(const char* path)
{
std::string out;
try
{
std::ifstream ifs(path); // input file stream
std::stringstream buffer;
buffer << ifs.rdbuf();
out = buffer.str();
}
catch (std::ifstream::failure e)
{
std::cerr << "[ERROR] Could not read/open file '" << path << "'\n";
}
return out;
}
void Shader::Use()
{
glUseProgram(Program);
}
void Shader::setBool(const std::string name, bool value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value ? 1 : 0);
}
void Shader::setFloat(const std::string name, float value) const
{
glUniform1f(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setInt(const std::string name, int value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setMat4(const std::string name, glm::mat4 value) const
{
glUniformMatrix4fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}
void Shader::setVec3(const std::string name, glm::vec3 value) const
{
setVec3(name, value.x, value.y, value.z);
}
void Shader::setVec3(const std::string name, float v0, float v1, float v2) const
{
glUniform3f(glGetUniformLocation(Program, name.c_str()), v0, v1, v2);
}
void Shader::setMat3(const std::string name, glm::mat3 value) const
{
glUniformMatrix3fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}

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lessons/2. Lighting/3. Materials/src/Shader.h Normal file
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#pragma once
#include <string>
#include <glm/glm.hpp>
class Shader
{
public:
unsigned int Program;
Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource = false);
Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource = false);
~Shader();
void Use();
void setBool(const std::string name, bool value) const;
void setFloat(const std::string name, float value) const;
void setInt(const std::string name, int value) const;
void setMat4(const std::string name, glm::mat4 value) const;
void setVec3(const std::string name, glm::vec3 value) const;
void setVec3(const std::string name, float v0, float v1, float v2) const;
void setMat3(const std::string name, glm::mat3 value) const;
static std::string readFile(const char* path);
};

292
lessons/2. Lighting/3. Materials/src/main.cpp Normal file
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "Shader.h"
#include "Camera.h"
#define TEXTURES_DIR "../../../../textures/"
#define SHADERS_DIR "../src/shaders/"
using namespace std;
typedef unsigned int uint;
// Global Constants
// ...
// Global Variables
GLFWwindow* window;
int WINDOW_WIDTH = 800;
int WINDOW_HEIGHT = 600;
Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
float deltaTime = 0.0f;
float lastFrame = 0.0f;
float lastX = 400;
float lastY = 300;
bool firstmouse = true;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
uint8_t init(void);
void framebuffersize_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void proccessInput(GLFWwindow* window);
unsigned int load_texture(const char* path, bool flip = true);
int main(int* argc, char** argv)
{
if (init() != 0)
return -1;
Shader lightingShader(SHADERS_DIR "vertexShader.vert", SHADERS_DIR "fragmentShader.frag");
Shader lightSourceShader(SHADERS_DIR "lightSource.vert", SHADERS_DIR "lightSource.frag");
float 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
};
uint cubeVAO; // Vertex array buffer
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);
uint VBO; // Vertex Buffer Object
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); // copy data to Graphics card array buffer (buffer for vertices)
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glBindVertexArray(0);
uint lightSourceVAO;
glGenVertexArrays(1, &lightSourceVAO);
glBindVertexArray(lightSourceVAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
glEnable(GL_DEPTH_TEST);
/* ------------------ MAIN loop ------------------ */
while (!glfwWindowShouldClose(window)) {
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
lastFrame = currentFrame; // cas kdy zacal tento frame
// input ...
proccessInput(window);
// rendering commands here ...
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 model(1.0f);
model = glm::translate(model, glm::vec3(0.0f));
glm::mat4 view = myCamera.getViewMatrix();
glm::mat4 projection(1.0f);
projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
glm::mat3 normalMatrix = glm::transpose(glm::inverse(model));
lightingShader.Use();
lightingShader.setMat4("model", model);
lightingShader.setMat4("view", view);
lightingShader.setMat4("projection", projection);
lightingShader.setMat3("normalMatrix", normalMatrix);
//lightPos.x = cos(glfwGetTime() * 0.5) * 3.0f;
//lightPos.z = sin(glfwGetTime() * 0.5) * 3.0f;
lightingShader.setVec3("material.ambient_color", glm::vec3(1.0f, 0.5f, 0.31f));
lightingShader.setVec3("material.diffuse_color", glm::vec3(1.0f, 0.5f, 0.31f));
lightingShader.setVec3("material.specular_color", glm::vec3(0.5f, 0.5f, 0.5f));
lightingShader.setFloat("material.shininess", 32.0f);
lightColor = glm::vec3(1.0f, 1.0f, 1.0f);
glm::vec3 light_diffuse_color = lightColor * glm::vec3(0.5f);
lightingShader.setVec3("light.position", lightPos);
lightingShader.setVec3("light.ambient_intensity", light_diffuse_color * glm::vec3(0.2f));
lightingShader.setVec3("light.diffuse_intensity", light_diffuse_color);
lightingShader.setVec3("light.specular_intensity", glm::vec3(1.0f));
lightingShader.setVec3("viewPos", myCamera.Position);
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
/* ----------- Light Source ----------- */
model = glm::mat4(1.0f);
model = glm::translate(model, lightPos);
model = glm::scale(model, glm::vec3(0.2f));
lightSourceShader.Use();
glm::mat4 PVM = projection * view * model;
lightSourceShader.setMat4("PVM", PVM);
lightSourceShader.setVec3("lightColor", lightColor);
glBindVertexArray(lightSourceVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
// check and calls events and swap the buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &lightSourceVAO);
glDeleteVertexArrays(1, &cubeVAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();
return 0;
}
uint8_t init(void) {
// init of glfw window
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "1. Colors", NULL, NULL);
if (window == NULL) {
cerr << "Failed to create glfw window" << endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// init of GLAD
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
cerr << "Failed to initialize GLAD" << endl;
}
glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
return 0;
}
void framebuffersize_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
WINDOW_HEIGHT = height;
WINDOW_WIDTH = width;
}
void proccessInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* -------------------- Movement -------------------- */
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_UP, deltaTime);
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstmouse) {
lastX = xpos;
lastY = ypos;
firstmouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
myCamera.ProccessMouse(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
myCamera.ProccessScroll(yoffset);
}
unsigned int load_texture(const char* path, bool flip)
{
unsigned int texture = 0;
int width, height, nrChannels, format;
stbi_set_flip_vertically_on_load(flip);
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
switch (nrChannels)
{
case 4: format = GL_RGBA; break;
case 3: format = GL_RGB; break;
case 2: format = GL_RED; break;
default: format = GL_RGB; break;
}
if (data) // data != NULL
{
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
cerr << "Could not load texture '" << path << "'\n";
}
stbi_image_free(data);
return texture;
}

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lessons/2. Lighting/3. Materials/src/shaders/fragmentShader.frag Normal file
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#version 330 core
struct Material {
vec3 ambient_color;
vec3 diffuse_color;
vec3 specular_color;
float shininess;
};
struct Light {
vec3 position;
vec3 ambient_intensity;
vec3 diffuse_intensity;
vec3 specular_intensity;
};
out vec4 FragColor;
uniform vec3 viewPos;
uniform Material material;
uniform Light light;
in vec3 Normal;
in vec3 FragPos;
void main()
{
vec3 lightDir = normalize(light.position - FragPos); // direction towards light source
vec3 normal = normalize(Normal);
float ambientStrength = 0.1;
vec3 ambient = light.ambient_intensity * material.ambient_color;
float diff = max(dot(lightDir, normal), 0.0f);
vec3 diffuse = light.diffuse_intensity * material.diffuse_color * diff;
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(normalize(viewPos - FragPos), reflectDir), 0.0), material.shininess);
float specularStrength = 0.5;
vec3 specular = light.specular_intensity * material.specular_color * spec;
vec3 result = ambient + diffuse + specular;
FragColor = vec4(result, 1.0f);
}

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lessons/2. Lighting/3. Materials/src/shaders/lightSource.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0f);
}

10
lessons/2. Lighting/3. Materials/src/shaders/lightSource.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 PVM;
void main()
{
gl_Position = PVM * vec4(aPos.xyz, 1.0);
}

19
lessons/2. Lighting/3. Materials/src/shaders/vertexShader.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
uniform mat3 normalMatrix;
out vec3 Normal;
out vec3 FragPos;
void main()
{
gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
Normal = normalMatrix * aNormal;
FragPos = vec3(model * vec4(aPos, 1.0));
}

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lessons/2. Lighting/4. Lighting Maps/Makefile Normal file
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NAME := main
CXX=g++
DEBUG :=
CXX_FLAGS := $(DEBUG) -std=c++14
LIBS := -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -pthread -lXi -ldl -lm
INCLUDE := ../../../include/
BIN := bin
SRC := src
INPUT = src/main.cpp ../../../glad.c
all: $(BIN)/$(NAME)
run:
cd $(BIN) && ./$(NAME)
$(BIN)/$(NAME): $(SRC)/main.o $(SRC)/glad.o $(SRC)/Shader.o $(SRC)/stb_image.o $(SRC)/Camera.o
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@ $(LIBS)
.cpp.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
.c.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/glad.o: ../../../glad.c
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/stb_image.o: ../../../stb_image.cpp
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
# dependencies
$(SRC)/main.o: $(SRC)/main.cpp
$(SRC)/Shader.o: $(SRC)/Shader.cpp
clean:
rm -rf $(SRC)/*.o
touch $(SRC)/*

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#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
Camera::Camera(glm::vec3 position, glm::vec3 worldUp, glm::vec3 worldFront, float yaw, float pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(2.5f), MouseSensitivity(0.001f), FOV(45.0f), Mode(CAM_FLOAT)
{
this->Position = position;
this->WorldUp = worldUp;
this->Yaw = yaw;
this->Pitch = pitch;
this->WorldFront = worldFront;
this->WorldRight = glm::normalize(glm::cross(this->WorldFront, this->WorldUp));
updateCameraVectors();
}
void Camera::updateCameraVectors()
{
glm::vec3 front;
front.x = cos(Yaw) * cos(Pitch);
front.y = sin(Pitch);
front.z = sin(Yaw) * cos(Pitch);
Front = glm::normalize(front);
Right = glm::normalize(glm::cross(Front, WorldUp));
Up = glm::normalize(glm::cross(Right, Front));
}
glm::mat4 Camera::getViewMatrix()
{
return glm::lookAt(Position, Position + Front, WorldUp);
}
void Camera::ProccessKeyboard(camera_movement direction, float deltaTime)
{
switch (direction)
{
case CAM_FORWARD:
Position += deltaTime * Front;
break;
case CAM_BACKWARD:
Position -= deltaTime * Front;
break;
case CAM_LEFT:
Position -= deltaTime * Right;
break;
case CAM_RIGHT:
Position += deltaTime * Right;
break;
case CAM_UP:
Position += deltaTime * WorldUp;
break;
case CAM_DOWN:
Position -= deltaTime * WorldUp;
break;
}
}
void Camera::ProccessMouse(float xoffset, float yoffset, bool constrainPitch)
{
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw = fmodf(Yaw + xoffset, 360.0f);
Pitch += yoffset;
if (constrainPitch)
{
if (Pitch > 89.0f)
Pitch = 89.0f;
else if (Pitch < -89.0f)
Pitch = -89.0f;
}
updateCameraVectors();
}
void Camera::ProccessScroll(float yoffset)
{
FOV -= yoffset;
if (FOV < 1.0f)
FOV = 1.0f;
else if (FOV > 45.0f)
FOV = 45.0f;
}
void Camera::SetCameraMode(camera_mode mode)
{
Mode = mode;
}

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lessons/2. Lighting/4. Lighting Maps/src/Camera.h Normal file
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#pragma once
#include <glm/glm.hpp>
enum camera_movement {
CAM_FORWARD,
CAM_BACKWARD,
CAM_LEFT,
CAM_RIGHT,
CAM_UP,
CAM_DOWN
};
enum camera_mode {
CAM_FLOAT,
CAM_MINECRAFT
};
class Camera
{
public:
float FOV;
float MovementSpeed;
float MouseSensitivity;
float Yaw; // vlevo vpravo
float Pitch; // nahoru dolu
camera_mode Mode;
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Right;
glm::vec3 Up;
glm::vec3 WorldUp;
glm::vec3 WorldRight;
glm::vec3 WorldFront;
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 worldUp = glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3 worldFront = glm::vec3(0.0f, 0.0f, -1.0),
float yaw = -90.0f, float pitch = 0);
glm::mat4 getViewMatrix();
void ProccessKeyboard(camera_movement direction, float deltaTime);
void ProccessMouse(float xoffset, float yoffset, bool constrainPitch = true);
void ProccessScroll(float yoffset);
void SetCameraMode(camera_mode mode);
private:
float lastY;
float lastX;
void updateCameraVectors();
};

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lessons/2. Lighting/4. Lighting Maps/src/Shader.cpp Normal file
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#include "Shader.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <glad/glad.h>
#include <glm/gtc/type_ptr.hpp>
Shader::Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource)
{
const char* vertexSource;
const char* fragmentSource;
std::string v, f;
if (!directSource)
{
v = readFile(vertexShaderSourcePath);
f = readFile(fragmentShaderSourcePath);
vertexSource = v.c_str();
fragmentSource = f.c_str();
}
else
{
vertexSource = vertexShaderSourcePath;
fragmentSource = fragmentShaderSourcePath;
}
int success;
char infoLog[512];
unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Vertex shader compilation failed!\n" << infoLog << std::endl;
}
unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Fragment shader compilation failed!\n" << infoLog << std::endl;
}
Program = glCreateProgram();
glAttachShader(Program, vertexShader);
glAttachShader(Program, fragmentShader);
glLinkProgram(Program);
glGetProgramiv(Program, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(Program, 512, NULL, infoLog);
std::cerr << "[ERROR] Program linking failed\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
Shader::Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource)
{
Shader(vertexShaderSourcePath.c_str(), fragmentShaderSourcePath.c_str(), directSource);
}
Shader::~Shader()
{
glDeleteProgram(Program);
}
std::string Shader::readFile(const char* path)
{
std::string out;
try
{
std::ifstream ifs(path); // input file stream
std::stringstream buffer;
buffer << ifs.rdbuf();
out = buffer.str();
}
catch (std::ifstream::failure e)
{
std::cerr << "[ERROR] Could not read/open file '" << path << "'\n";
}
return out;
}
void Shader::Use()
{
glUseProgram(Program);
}
void Shader::setBool(const std::string name, bool value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value ? 1 : 0);
}
void Shader::setFloat(const std::string name, float value) const
{
glUniform1f(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setInt(const std::string name, int value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setMat4(const std::string name, glm::mat4 value) const
{
glUniformMatrix4fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}
void Shader::setVec3(const std::string name, glm::vec3 value) const
{
setVec3(name, value.x, value.y, value.z);
}
void Shader::setVec3(const std::string name, float v0, float v1, float v2) const
{
glUniform3f(glGetUniformLocation(Program, name.c_str()), v0, v1, v2);
}
void Shader::setMat3(const std::string name, glm::mat3 value) const
{
glUniformMatrix3fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}

27
lessons/2. Lighting/4. Lighting Maps/src/Shader.h Normal file
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#pragma once
#include <string>
#include <glm/glm.hpp>
class Shader
{
public:
unsigned int Program;
Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource = false);
Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource = false);
~Shader();
void Use();
void setBool(const std::string name, bool value) const;
void setFloat(const std::string name, float value) const;
void setInt(const std::string name, int value) const;
void setMat4(const std::string name, glm::mat4 value) const;
void setVec3(const std::string name, glm::vec3 value) const;
void setVec3(const std::string name, float v0, float v1, float v2) const;
void setMat3(const std::string name, glm::mat3 value) const;
static std::string readFile(const char* path);
};

309
lessons/2. Lighting/4. Lighting Maps/src/main.cpp Normal file
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "Shader.h"
#include "Camera.h"
#define TEXTURES_DIR "../../../../textures/"
#define SHADERS_DIR "../src/shaders/"
using namespace std;
typedef unsigned int uint;
// Global Constants
// ...
// Global Variables
GLFWwindow* window;
int WINDOW_WIDTH = 800;
int WINDOW_HEIGHT = 600;
Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
float deltaTime = 0.0f;
float lastFrame = 0.0f;
float lastX = 400;
float lastY = 300;
bool firstmouse = true;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
uint8_t init(void);
void framebuffersize_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void proccessInput(GLFWwindow* window);
unsigned int load_texture(const char* path, bool flip = true);
int main(int* argc, char** argv)
{
if (init() != 0)
return -1;
Shader lightingShader(SHADERS_DIR "vertexShader.vert", SHADERS_DIR "fragmentShader.frag");
Shader lightSourceShader(SHADERS_DIR "lightSource.vert", SHADERS_DIR "lightSource.frag");
float vertices[] = {
// positions // normals // texture coords
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f
};
uint cubeVAO; // Vertex array buffer
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);
uint VBO; // Vertex Buffer Object
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); // copy data to Graphics card array buffer (buffer for vertices)
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);
glBindVertexArray(0);
uint lightSourceVAO;
glGenVertexArrays(1, &lightSourceVAO);
glBindVertexArray(lightSourceVAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
uint container_texture = load_texture(TEXTURES_DIR "container2.png");
uint container2_specular = load_texture(TEXTURES_DIR "container2_specular.png");
uint matrix_texture = load_texture(TEXTURES_DIR "matrix.jpg");
glEnable(GL_DEPTH_TEST);
/* ------------------ MAIN loop ------------------ */
while (!glfwWindowShouldClose(window)) {
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
lastFrame = currentFrame; // cas kdy zacal tento frame
// input ...
proccessInput(window);
// rendering commands here ...
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 model(1.0f);
model = glm::translate(model, glm::vec3(0.0f));
glm::mat4 view = myCamera.getViewMatrix();
glm::mat4 projection(1.0f);
projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
glm::mat3 normalMatrix = glm::transpose(glm::inverse(model));
lightingShader.Use();
lightingShader.setMat4("model", model);
lightingShader.setMat4("view", view);
lightingShader.setMat4("projection", projection);
lightingShader.setMat3("normalMatrix", normalMatrix);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, container_texture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, container2_specular);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, matrix_texture);
lightingShader.setFloat("time", (float)glfwGetTime() * 2.0f);
lightingShader.setInt("emission_map", 2);
lightingShader.setInt("material.diffuse_map", 0);
lightingShader.setInt("material.specular_map", 1);
lightingShader.setFloat("material.shininess", 64.0f);
lightColor = glm::vec3(1.0f, 1.0f, 1.0f);
glm::vec3 light_diffuse_color = lightColor * glm::vec3(0.6f);
lightingShader.setVec3("light.position", lightPos);
lightingShader.setVec3("light.ambient_intensity", light_diffuse_color * glm::vec3(0.1f));
lightingShader.setVec3("light.diffuse_intensity", light_diffuse_color);
lightingShader.setVec3("light.specular_intensity", lightColor * glm::vec3(1.0f));
lightingShader.setVec3("viewPos", myCamera.Position);
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
/* ----------- Light Source ----------- */
model = glm::mat4(1.0f);
model = glm::translate(model, lightPos);
model = glm::scale(model, glm::vec3(0.2f));
lightSourceShader.Use();
glm::mat4 PVM = projection * view * model;
lightSourceShader.setMat4("PVM", PVM);
lightSourceShader.setVec3("lightColor", lightColor);
glBindVertexArray(lightSourceVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
// check and calls events and swap the buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &lightSourceVAO);
glDeleteVertexArrays(1, &cubeVAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();
return 0;
}
uint8_t init(void) {
// init of glfw window
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "4. Lighting Maps", NULL, NULL);
if (window == NULL) {
cerr << "Failed to create glfw window" << endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// init of GLAD
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
cerr << "Failed to initialize GLAD" << endl;
}
glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
return 0;
}
void framebuffersize_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
WINDOW_HEIGHT = height;
WINDOW_WIDTH = width;
}
void proccessInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* -------------------- Movement -------------------- */
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_UP, deltaTime);
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstmouse) {
lastX = xpos;
lastY = ypos;
firstmouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
myCamera.ProccessMouse(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
myCamera.ProccessScroll(yoffset);
}
unsigned int load_texture(const char* path, bool flip)
{
unsigned int texture = 0;
int width, height, nrChannels, format;
stbi_set_flip_vertically_on_load(flip);
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
switch (nrChannels)
{
case 4: format = GL_RGBA; break;
case 3: format = GL_RGB; break;
case 2: format = GL_RED; break;
default: format = GL_RGB; break;
}
if (data) // data != NULL
{
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
cerr << "Could not load texture '" << path << "'\n";
}
stbi_image_free(data);
return texture;
}

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lessons/2. Lighting/4. Lighting Maps/src/shaders/fragmentShader.frag Normal file
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#version 330 core
struct Material {
sampler2D diffuse_map;
sampler2D specular_map;
float shininess;
};
struct Light {
vec3 position;
vec3 ambient_intensity;
vec3 diffuse_intensity;
vec3 specular_intensity;
};
out vec4 FragColor;
uniform vec3 viewPos;
uniform Material material;
uniform Light light;
uniform sampler2D emission_map;
in vec3 Normal;
in vec3 FragPos;
in vec2 TexCoord;
uniform float time;
void main()
{
vec3 lightDir = normalize(light.position - FragPos); // direction towards light source
vec3 normal = normalize(Normal);
vec3 ambient = light.ambient_intensity * vec3(texture(material.diffuse_map, TexCoord));
float diff = max(dot(lightDir, normal), 0.0f);
vec3 diffuse = light.diffuse_intensity * diff * vec3(texture(material.diffuse_map, TexCoord));
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(normalize(viewPos - FragPos), reflectDir), 0.0), material.shininess);
vec3 specular = light.specular_intensity * spec * vec3(texture(material.specular_map, TexCoord));
vec3 emission = vec3(0.0);
if (vec3(texture(material.specular_map, TexCoord)) == vec3(0.0))
emission = vec3(texture(emission_map, TexCoord + vec2(0.0, time)));
vec3 result = ambient + diffuse + specular + emission;
FragColor = vec4(result, 1.0f);
}

10
lessons/2. Lighting/4. Lighting Maps/src/shaders/lightSource.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0f);
}

10
lessons/2. Lighting/4. Lighting Maps/src/shaders/lightSource.vert Normal file
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@@ -0,0 +1,10 @@
#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 PVM;
void main()
{
gl_Position = PVM * vec4(aPos.xyz, 1.0);
}

22
lessons/2. Lighting/4. Lighting Maps/src/shaders/vertexShader.vert Normal file
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@@ -0,0 +1,22 @@
#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
layout (location = 2) in vec2 aTexCoord;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
uniform mat3 normalMatrix;
out vec3 Normal;
out vec3 FragPos;
out vec2 TexCoord;
void main()
{
gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
Normal = normalMatrix * aNormal;
FragPos = vec3(model * vec4(aPos, 1.0));
TexCoord = aTexCoord;
}

37
lessons/2. Lighting/5. Light casters/Makefile Normal file
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NAME := main
CXX=g++
DEBUG :=
CXX_FLAGS := $(DEBUG) -std=c++14
LIBS := -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -pthread -lXi -ldl -lm
INCLUDE := ../../../include/
BIN := bin
SRC := src
INPUT = src/main.cpp ../../../glad.c
all: $(BIN)/$(NAME)
run:
cd $(BIN) && ./$(NAME)
$(BIN)/$(NAME): $(SRC)/main.o $(SRC)/glad.o $(SRC)/Shader.o $(SRC)/stb_image.o $(SRC)/Camera.o
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@ $(LIBS)
.cpp.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
.c.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/glad.o: ../../../glad.c
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/stb_image.o: ../../../stb_image.cpp
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
# dependencies
$(SRC)/main.o: $(SRC)/main.cpp
$(SRC)/Shader.o: $(SRC)/Shader.cpp
clean:
rm -rf $(SRC)/*.o
touch $(SRC)/*

83
lessons/2. Lighting/5. Light casters/src/Camera.cpp Normal file
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#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
Camera::Camera(glm::vec3 position, glm::vec3 worldUp, glm::vec3 worldFront, float yaw, float pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(2.5f), MouseSensitivity(0.001f), FOV(45.0f), Mode(CAM_FLOAT)
{
this->Position = position;
this->WorldUp = worldUp;
this->Yaw = yaw;
this->Pitch = pitch;
this->WorldFront = worldFront;
this->WorldRight = glm::normalize(glm::cross(this->WorldFront, this->WorldUp));
updateCameraVectors();
}
void Camera::updateCameraVectors()
{
glm::vec3 front;
front.x = cos(Yaw) * cos(Pitch);
front.y = sin(Pitch);
front.z = sin(Yaw) * cos(Pitch);
Front = glm::normalize(front);
Right = glm::normalize(glm::cross(Front, WorldUp));
Up = glm::normalize(glm::cross(Right, Front));
}
glm::mat4 Camera::getViewMatrix()
{
return glm::lookAt(Position, Position + Front, WorldUp);
}
void Camera::ProccessKeyboard(camera_movement direction, float deltaTime)
{
switch (direction)
{
case CAM_FORWARD:
Position += deltaTime * MovementSpeed * Front;
break;
case CAM_BACKWARD:
Position -= deltaTime * MovementSpeed * Front;
break;
case CAM_LEFT:
Position -= deltaTime * MovementSpeed * Right;
break;
case CAM_RIGHT:
Position += deltaTime * MovementSpeed * Right;
break;
case CAM_UP:
Position += deltaTime * MovementSpeed * WorldUp;
break;
case CAM_DOWN:
Position -= deltaTime * MovementSpeed * WorldUp;
break;
}
}
void Camera::ProccessMouse(float xoffset, float yoffset, bool constrainPitch)
{
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw = fmodf(Yaw + xoffset, 360.0f);
Pitch += yoffset;
if (constrainPitch)
{
if (Pitch > 89.0f)
Pitch = 89.0f;
else if (Pitch < -89.0f)
Pitch = -89.0f;
}
updateCameraVectors();
}
void Camera::ProccessScroll(float yoffset)
{
FOV -= yoffset;
if (FOV < 1.0f)
FOV = 1.0f;
else if (FOV > 45.0f)
FOV = 45.0f;
}
void Camera::SetCameraMode(camera_mode mode)
{
Mode = mode;
}

54
lessons/2. Lighting/5. Light casters/src/Camera.h Normal file
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#pragma once
#include <glm/glm.hpp>
enum camera_movement {
CAM_FORWARD,
CAM_BACKWARD,
CAM_LEFT,
CAM_RIGHT,
CAM_UP,
CAM_DOWN
};
enum camera_mode {
CAM_FLOAT,
CAM_MINECRAFT
};
class Camera
{
public:
float FOV;
float MovementSpeed;
float MouseSensitivity;
float Yaw; // vlevo vpravo
float Pitch; // nahoru dolu
camera_mode Mode;
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Right;
glm::vec3 Up;
glm::vec3 WorldUp;
glm::vec3 WorldRight;
glm::vec3 WorldFront;
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 worldUp = glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3 worldFront = glm::vec3(0.0f, 0.0f, -1.0),
float yaw = -90.0f, float pitch = 0);
glm::mat4 getViewMatrix();
void ProccessKeyboard(camera_movement direction, float deltaTime);
void ProccessMouse(float xoffset, float yoffset, bool constrainPitch = true);
void ProccessScroll(float yoffset);
void SetCameraMode(camera_mode mode);
private:
float lastY;
float lastX;
void updateCameraVectors();
};

119
lessons/2. Lighting/5. Light casters/src/Shader.cpp Normal file
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#include "Shader.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <glad/glad.h>
#include <glm/gtc/type_ptr.hpp>
Shader::Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource)
{
const char* vertexSource;
const char* fragmentSource;
std::string v, f;
if (!directSource)
{
v = readFile(vertexShaderSourcePath);
f = readFile(fragmentShaderSourcePath);
vertexSource = v.c_str();
fragmentSource = f.c_str();
}
else
{
vertexSource = vertexShaderSourcePath;
fragmentSource = fragmentShaderSourcePath;
}
int success;
char infoLog[512];
unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Vertex shader compilation failed!\n" << infoLog << std::endl;
}
unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Fragment shader compilation failed!\n" << infoLog << std::endl;
}
Program = glCreateProgram();
glAttachShader(Program, vertexShader);
glAttachShader(Program, fragmentShader);
glLinkProgram(Program);
glGetProgramiv(Program, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(Program, 512, NULL, infoLog);
std::cerr << "[ERROR] Program linking failed\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
Shader::Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource)
{
Shader(vertexShaderSourcePath.c_str(), fragmentShaderSourcePath.c_str(), directSource);
}
Shader::~Shader()
{
glDeleteProgram(Program);
}
std::string Shader::readFile(const char* path)
{
std::string out;
try
{
std::ifstream ifs(path); // input file stream
std::stringstream buffer;
buffer << ifs.rdbuf();
out = buffer.str();
}
catch (std::ifstream::failure e)
{
std::cerr << "[ERROR] Could not read/open file '" << path << "'\n";
}
return out;
}
void Shader::Use()
{
glUseProgram(Program);
}
void Shader::setBool(const std::string name, bool value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value ? 1 : 0);
}
void Shader::setFloat(const std::string name, float value) const
{
glUniform1f(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setInt(const std::string name, int value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setMat4(const std::string name, glm::mat4 value) const
{
glUniformMatrix4fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}
void Shader::setVec3(const std::string name, glm::vec3 value) const
{
setVec3(name, value.x, value.y, value.z);
}
void Shader::setVec3(const std::string name, float v0, float v1, float v2) const
{
glUniform3f(glGetUniformLocation(Program, name.c_str()), v0, v1, v2);
}
void Shader::setMat3(const std::string name, glm::mat3 value) const
{
glUniformMatrix3fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}

27
lessons/2. Lighting/5. Light casters/src/Shader.h Normal file
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#pragma once
#include <string>
#include <glm/glm.hpp>
class Shader
{
public:
unsigned int Program;
Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource = false);
Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource = false);
~Shader();
void Use();
void setBool(const std::string name, bool value) const;
void setFloat(const std::string name, float value) const;
void setInt(const std::string name, int value) const;
void setMat4(const std::string name, glm::mat4 value) const;
void setVec3(const std::string name, glm::vec3 value) const;
void setVec3(const std::string name, float v0, float v1, float v2) const;
void setMat3(const std::string name, glm::mat3 value) const;
static std::string readFile(const char* path);
};

328
lessons/2. Lighting/5. Light casters/src/main.cpp Normal file
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#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "Shader.h"
#include "Camera.h"
#define TEXTURES_DIR "../../../../textures/"
#define SHADERS_DIR "../src/shaders/"
using namespace std;
typedef unsigned int uint;
// Global Constants
// ...
// Global Variables
GLFWwindow* window;
int WINDOW_WIDTH = 800;
int WINDOW_HEIGHT = 600;
Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
float deltaTime = 0.0f;
float lastFrame = 0.0f;
float lastX = 400;
float lastY = 300;
bool firstmouse = true;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
uint8_t init(void);
void framebuffersize_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void proccessInput(GLFWwindow* window);
unsigned int load_texture(const char* path, bool flip = true);
int main(int argc, char** argv)
{
if (init() != 0)
return -1;
Shader lightingShader(SHADERS_DIR "vertexShader.vert", SHADERS_DIR "fragmentShader.frag");
Shader lightSourceShader(SHADERS_DIR "lightSource.vert", SHADERS_DIR "lightSource.frag");
float vertices[] = {
// positions // normals // texture coords
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f
};
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)
};
uint cubeVAO; // Vertex array buffer
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);
uint VBO; // Vertex Buffer Object
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); // copy data to Graphics card array buffer (buffer for vertices)
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);
glBindVertexArray(0);
uint lightSourceVAO;
glGenVertexArrays(1, &lightSourceVAO);
glBindVertexArray(lightSourceVAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
uint container_texture = load_texture(TEXTURES_DIR "container2.png");
uint container2_specular = load_texture(TEXTURES_DIR "container2_specular.png");
glEnable(GL_DEPTH_TEST);
/* ------------------ MAIN loop ------------------ */
while (!glfwWindowShouldClose(window)) {
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
lastFrame = currentFrame; // cas kdy zacal tento frame
// input ...
proccessInput(window);
// rendering commands here ...
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, container_texture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, container2_specular);
lightingShader.Use();
lightingShader.setInt("material.diffuse_map", 0);
lightingShader.setInt("material.specular_map", 1);
lightingShader.setFloat("material.shininess", 64.0f);
lightColor = glm::vec3(1.0f, 1.0f, 1.0f);
glm::vec3 light_diffuse_color = lightColor * glm::vec3(0.6f);
// lightingShader.setVec3("light.position", lightPos);
// lightingShader.setVec3("light.direction", -0.2f, -1.0f, -0.3f);
lightingShader.setVec3("light.position", myCamera.Position);
lightingShader.setVec3("light.direction", myCamera.Front);
lightingShader.setFloat("light.cutOff", glm::cos(glm::radians(12.5f)));
lightingShader.setFloat("light.outerCutOff", glm::cos(glm::radians(17.5f)));
lightingShader.setVec3("light.ambient_intensity", light_diffuse_color * glm::vec3(0.2f));
lightingShader.setVec3("light.diffuse_intensity", light_diffuse_color);
lightingShader.setVec3("light.specular_intensity", lightColor * glm::vec3(1.0f));
lightingShader.setFloat("light.constant", 1.0f);
lightingShader.setFloat("light.linear", 0.07f);
lightingShader.setFloat("light.quadratic", 0.032f);
lightingShader.setVec3("viewPos", myCamera.Position);
glm::mat4 view = myCamera.getViewMatrix();
glm::mat4 projection(1.0f);
projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
lightingShader.setMat4("view", view);
lightingShader.setMat4("projection", projection);
for (int i = 0; i < sizeof(cubePositions) / sizeof(glm::vec3); i++)
{
float angle = i * 20.0f;
glm::mat4 model(1.0f);
model = glm::translate(model, cubePositions[i]);
model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
glm::mat3 normalMatrix = glm::transpose(glm::inverse(model));
lightingShader.setMat4("model", model);
lightingShader.setMat3("normalMatrix", normalMatrix);
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
}
/* ----------- Light Source ----------- */
glm::mat4 model(1.0f);
model = glm::translate(model, lightPos);
model = glm::scale(model, glm::vec3(0.2f));
lightSourceShader.Use();
glm::mat4 PVM = projection * view * model;
lightSourceShader.setMat4("PVM", PVM);
lightSourceShader.setVec3("lightColor", lightColor);
glBindVertexArray(lightSourceVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
// check and calls events and swap the buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &lightSourceVAO);
glDeleteVertexArrays(1, &cubeVAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();
return 0;
}
uint8_t init(void) {
// init of glfw window
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "5. Light casters", NULL, NULL);
if (window == NULL) {
cerr << "Failed to create glfw window" << endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// init of GLAD
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
cerr << "Failed to initialize GLAD" << endl;
}
glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
return 0;
}
void framebuffersize_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
WINDOW_HEIGHT = height;
WINDOW_WIDTH = width;
}
void proccessInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* -------------------- Movement -------------------- */
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_UP, deltaTime);
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstmouse) {
lastX = xpos;
lastY = ypos;
firstmouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
myCamera.ProccessMouse(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
myCamera.ProccessScroll(yoffset);
}
unsigned int load_texture(const char* path, bool flip)
{
unsigned int texture = 0;
int width, height, nrChannels, format;
stbi_set_flip_vertically_on_load(flip);
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
switch (nrChannels)
{
case 4: format = GL_RGBA; break;
case 3: format = GL_RGB; break;
case 2: format = GL_RED; break;
default: format = GL_RGB; break;
}
if (data) // data != NULL
{
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
cerr << "Could not load texture '" << path << "'\n";
}
stbi_image_free(data);
return texture;
}

84
lessons/2. Lighting/5. Light casters/src/shaders/fragmentShader.frag Normal file
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#version 330 core
struct Material {
sampler2D diffuse_map;
sampler2D specular_map;
float shininess;
};
struct Light {
vec3 position;
vec3 direction;
vec3 ambient_intensity;
vec3 diffuse_intensity;
vec3 specular_intensity;
float constant;
float linear;
float quadratic;
float cutOff;
float outerCutOff;
};
out vec4 FragColor;
uniform vec3 viewPos;
uniform Material material;
uniform Light light;
in vec3 Normal;
in vec3 FragPos;
in vec2 TexCoord;
void main()
{
// vec3 lightDir = normalize(light.position - FragPos); // direction towards light source
//// vec3 lightDir = normalize(-light.direction);
// float frag_dist = length(light.position - FragPos); // fragment distance from light source position
// float attenuation = 1.0 / (light.constant + light.linear * frag_dist + light.quadratic * frag_dist * frag_dist);
// vec3 normal = normalize(Normal);
//
// vec3 ambient = light.ambient_intensity * vec3(texture(material.diffuse_map, TexCoord));
//
// float diff = max(dot(lightDir, normal), 0.0f);
// vec3 diffuse = light.diffuse_intensity * diff * vec3(texture(material.diffuse_map, TexCoord));
//
// vec3 reflectDir = reflect(-lightDir, normal);
// float spec = pow(max(dot(normalize(viewPos - FragPos), reflectDir), 0.0), material.shininess);
// vec3 specular = light.specular_intensity * spec * vec3(texture(material.specular_map, TexCoord));
//
// vec3 result = (ambient + diffuse + specular) * attenuation;
// FragColor = vec4(result, 1.0f);
vec3 lightDir = normalize(light.position - FragPos); // direction towards light source
// vec3 lightDir = normalize(-light.direction);
vec3 normal = normalize(Normal);
vec3 ambient = light.ambient_intensity * vec3(texture(material.diffuse_map, TexCoord));
float diff = max(dot(lightDir, normal), 0.0f);
vec3 diffuse = light.diffuse_intensity * diff * vec3(texture(material.diffuse_map, TexCoord));
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(normalize(viewPos - FragPos), reflectDir), 0.0), material.shininess);
vec3 specular = light.specular_intensity * spec * vec3(texture(material.specular_map, TexCoord));
float dist = length(light.position - FragPos);
float attenuation = 1.0 / (light.constant + light.linear * dist + light.quadratic * (dist * dist));
float theta = dot(lightDir, normalize(-light.direction));
float epsilon = light.cutOff - light.outerCutOff;
float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
//float intensity = smoothstep(0.0, 1.0, (theta - light.outerCutOff) / epsilon);
diffuse *= attenuation * intensity;
specular *= attenuation * intensity;
vec3 result = ambient + diffuse + specular;
FragColor = vec4(result, 1.0f);
}

10
lessons/2. Lighting/5. Light casters/src/shaders/lightSource.frag Normal file
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@@ -0,0 +1,10 @@
#version 330 core
out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0f);
}

10
lessons/2. Lighting/5. Light casters/src/shaders/lightSource.vert Normal file
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@@ -0,0 +1,10 @@
#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 PVM;
void main()
{
gl_Position = PVM * vec4(aPos.xyz, 1.0);
}

22
lessons/2. Lighting/5. Light casters/src/shaders/vertexShader.vert Normal file
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@@ -0,0 +1,22 @@
#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
layout (location = 2) in vec2 aTexCoord;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
uniform mat3 normalMatrix;
out vec3 Normal;
out vec3 FragPos;
out vec2 TexCoord;
void main()
{
gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
Normal = normalMatrix * aNormal;
FragPos = vec3(model * vec4(aPos, 1.0));
TexCoord = aTexCoord;
}

37
lessons/2. Lighting/6. Multiple Lights/Makefile Normal file
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@@ -0,0 +1,37 @@
NAME := main
CXX=g++
DEBUG :=
CXX_FLAGS := $(DEBUG) -std=c++14
LIBS := -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -pthread -lXi -ldl -lm
INCLUDE := ../../../include/
BIN := bin
SRC := src
INPUT = src/main.cpp ../../../glad.c
all: $(BIN)/$(NAME)
run:
cd $(BIN) && ./$(NAME)
$(BIN)/$(NAME): $(SRC)/main.o $(SRC)/glad.o $(SRC)/Shader.o $(SRC)/stb_image.o $(SRC)/Camera.o
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) $^ -o $@ $(LIBS)
.cpp.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
.c.o:
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/glad.o: ../../../glad.c
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
$(SRC)/stb_image.o: ../../../stb_image.cpp
$(CXX) $(CXX_FLAGS) -I$(INCLUDE) -c $< -o $@
# dependencies
$(SRC)/main.o: $(SRC)/main.cpp
$(SRC)/Shader.o: $(SRC)/Shader.cpp
clean:
rm -rf $(SRC)/*.o
touch $(SRC)/*

83
lessons/2. Lighting/6. Multiple Lights/src/Camera.cpp Normal file
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#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
Camera::Camera(glm::vec3 position, glm::vec3 worldUp, glm::vec3 worldFront, float yaw, float pitch) : Front(glm::vec3(0.0f, 0.0f, -1.0f)), MovementSpeed(2.5f), MouseSensitivity(0.1f), FOV(45.0f), Mode(CAM_FLOAT)
{
this->Position = position;
this->WorldUp = worldUp;
this->Yaw = yaw;
this->Pitch = pitch;
this->WorldFront = worldFront;
this->WorldRight = glm::normalize(glm::cross(this->WorldFront, this->WorldUp));
updateCameraVectors();
}
void Camera::updateCameraVectors()
{
glm::vec3 front;
front.x = cos(glm::radians(Yaw)) * cos(glm::radians(Pitch));
front.y = sin(glm::radians(Pitch));
front.z = sin(glm::radians(Yaw)) * cos(glm::radians(Pitch));
Front = glm::normalize(front);
Right = glm::normalize(glm::cross(Front, WorldUp));
Up = glm::normalize(glm::cross(Right, Front));
}
glm::mat4 Camera::getViewMatrix()
{
return glm::lookAt(Position, Position + Front, WorldUp);
}
void Camera::ProccessKeyboard(camera_movement direction, float deltaTime)
{
switch (direction)
{
case CAM_FORWARD:
Position += deltaTime * MovementSpeed * Front;
break;
case CAM_BACKWARD:
Position -= deltaTime * MovementSpeed * Front;
break;
case CAM_LEFT:
Position -= deltaTime * MovementSpeed * Right;
break;
case CAM_RIGHT:
Position += deltaTime * MovementSpeed * Right;
break;
case CAM_UP:
Position += deltaTime * MovementSpeed * WorldUp;
break;
case CAM_DOWN:
Position -= deltaTime * MovementSpeed * WorldUp;
break;
}
}
void Camera::ProccessMouse(float xoffset, float yoffset, bool constrainPitch)
{
xoffset *= MouseSensitivity;
yoffset *= MouseSensitivity;
Yaw = fmodf(Yaw + xoffset, 360.0f);
Pitch += yoffset;
if (constrainPitch)
{
if (Pitch > 89.0f)
Pitch = 89.0f;
else if (Pitch < -89.0f)
Pitch = -89.0f;
}
updateCameraVectors();
}
void Camera::ProccessScroll(float yoffset)
{
FOV -= yoffset;
if (FOV < 1.0f)
FOV = 1.0f;
else if (FOV > 45.0f)
FOV = 45.0f;
}
void Camera::SetCameraMode(camera_mode mode)
{
Mode = mode;
}

54
lessons/2. Lighting/6. Multiple Lights/src/Camera.h Normal file
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#pragma once
#include <glm/glm.hpp>
enum camera_movement {
CAM_FORWARD,
CAM_BACKWARD,
CAM_LEFT,
CAM_RIGHT,
CAM_UP,
CAM_DOWN
};
enum camera_mode {
CAM_FLOAT,
CAM_MINECRAFT
};
class Camera
{
public:
float FOV;
float MovementSpeed;
float MouseSensitivity;
float Yaw; // vlevo vpravo
float Pitch; // nahoru dolu
camera_mode Mode;
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Right;
glm::vec3 Up;
glm::vec3 WorldUp;
glm::vec3 WorldRight;
glm::vec3 WorldFront;
Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3 worldUp = glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec3 worldFront = glm::vec3(0.0f, 0.0f, -1.0),
float yaw = -90.0f, float pitch = 0);
glm::mat4 getViewMatrix();
void ProccessKeyboard(camera_movement direction, float deltaTime);
void ProccessMouse(float xoffset, float yoffset, bool constrainPitch = true);
void ProccessScroll(float yoffset);
void SetCameraMode(camera_mode mode);
private:
float lastY;
float lastX;
void updateCameraVectors();
};

119
lessons/2. Lighting/6. Multiple Lights/src/Shader.cpp Normal file
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#include "Shader.h"
#include <iostream>
#include <fstream>
#include <sstream>
#include <glad/glad.h>
#include <glm/gtc/type_ptr.hpp>
Shader::Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource)
{
const char* vertexSource;
const char* fragmentSource;
std::string v, f;
if (!directSource)
{
v = readFile(vertexShaderSourcePath);
f = readFile(fragmentShaderSourcePath);
vertexSource = v.c_str();
fragmentSource = f.c_str();
}
else
{
vertexSource = vertexShaderSourcePath;
fragmentSource = fragmentShaderSourcePath;
}
int success;
char infoLog[512];
unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Vertex shader compilation failed!\n" << infoLog << std::endl;
}
unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, NULL);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cerr << "Shader.h: [ERROR] Fragment shader compilation failed!\n" << infoLog << std::endl;
}
Program = glCreateProgram();
glAttachShader(Program, vertexShader);
glAttachShader(Program, fragmentShader);
glLinkProgram(Program);
glGetProgramiv(Program, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(Program, 512, NULL, infoLog);
std::cerr << "[ERROR] Program linking failed\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
Shader::Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource)
{
Shader(vertexShaderSourcePath.c_str(), fragmentShaderSourcePath.c_str(), directSource);
}
Shader::~Shader()
{
glDeleteProgram(Program);
}
std::string Shader::readFile(const char* path)
{
std::string out;
try
{
std::ifstream ifs(path); // input file stream
std::stringstream buffer;
buffer << ifs.rdbuf();
out = buffer.str();
}
catch (std::ifstream::failure e)
{
std::cerr << "[ERROR] Could not read/open file '" << path << "'\n";
}
return out;
}
void Shader::Use()
{
glUseProgram(Program);
}
void Shader::setBool(const std::string name, bool value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value ? 1 : 0);
}
void Shader::setFloat(const std::string name, float value) const
{
glUniform1f(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setInt(const std::string name, int value) const
{
glUniform1i(glGetUniformLocation(Program, name.c_str()), value);
}
void Shader::setMat4(const std::string name, glm::mat4 value) const
{
glUniformMatrix4fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}
void Shader::setVec3(const std::string name, glm::vec3 value) const
{
setVec3(name, value.x, value.y, value.z);
}
void Shader::setVec3(const std::string name, float v0, float v1, float v2) const
{
glUniform3f(glGetUniformLocation(Program, name.c_str()), v0, v1, v2);
}
void Shader::setMat3(const std::string name, glm::mat3 value) const
{
glUniformMatrix3fv(glGetUniformLocation(Program, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
}

27
lessons/2. Lighting/6. Multiple Lights/src/Shader.h Normal file
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@@ -0,0 +1,27 @@
#pragma once
#include <string>
#include <glm/glm.hpp>
class Shader
{
public:
unsigned int Program;
Shader(const char* vertexShaderSourcePath, const char* fragmentShaderSourcePath, bool directSource = false);
Shader(std::string vertexShaderSourcePath, std::string fragmentShaderSourcePath, bool directSource = false);
~Shader();
void Use();
void setBool(const std::string name, bool value) const;
void setFloat(const std::string name, float value) const;
void setInt(const std::string name, int value) const;
void setMat4(const std::string name, glm::mat4 value) const;
void setVec3(const std::string name, glm::vec3 value) const;
void setVec3(const std::string name, float v0, float v1, float v2) const;
void setMat3(const std::string name, glm::mat3 value) const;
static std::string readFile(const char* path);
};

356
lessons/2. Lighting/6. Multiple Lights/src/main.cpp Normal file
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@@ -0,0 +1,356 @@
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include <stb_image.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "Shader.h"
#include "Camera.h"
#define TEXTURES_DIR "../../../../textures/"
#define SHADERS_DIR "../src/shaders/"
using namespace std;
typedef unsigned int uint;
// Global Constants
// ...
// Global Variables
GLFWwindow* window;
int WINDOW_WIDTH = 800;
int WINDOW_HEIGHT = 600;
Camera myCamera(glm::vec3(0.0f, 0.0f, 3.0f));
float deltaTime = 0.0f;
float lastFrame = 0.0f;
float lastX = 400;
float lastY = 300;
bool firstmouse = true;
glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
glm::vec3 lightColor(1.0f, 1.0f, 1.0f);
uint8_t init(void);
void framebuffersize_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void proccessInput(GLFWwindow* window);
unsigned int load_texture(const char* path, bool flip = true);
int main(int argc, char** argv)
{
if (init() != 0)
return -1;
Shader lightingShader(SHADERS_DIR "vertexShader.vert", SHADERS_DIR "fragmentShader.frag");
Shader lightSourceShader(SHADERS_DIR "lightSource.vert", SHADERS_DIR "lightSource.frag");
float vertices[] = {
// positions // normals // texture coords
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f
};
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)
};
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)
};
uint cubeVAO; // Vertex array buffer
glGenVertexArrays(1, &cubeVAO);
glBindVertexArray(cubeVAO);
uint VBO; // Vertex Buffer Object
glGenBuffers(1, &VBO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); // copy data to Graphics card array buffer (buffer for vertices)
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);
glBindVertexArray(0);
uint lightSourceVAO;
glGenVertexArrays(1, &lightSourceVAO);
glBindVertexArray(lightSourceVAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (const void*)0);
glEnableVertexAttribArray(0);
glBindVertexArray(0);
uint container_texture = load_texture(TEXTURES_DIR "container2.png");
uint container2_specular = load_texture(TEXTURES_DIR "container2_specular.png");
glEnable(GL_DEPTH_TEST);
/* ------------------ MAIN loop ------------------ */
while (!glfwWindowShouldClose(window)) {
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame; // cas jak dlouho trval posledni frame
lastFrame = currentFrame; // cas kdy zacal tento frame
// input ...
proccessInput(window);
// rendering commands here ...
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, container_texture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, container2_specular);
lightingShader.Use();
lightingShader.setInt("material.diffuse_map", 0);
lightingShader.setInt("material.specular_map", 1);
lightingShader.setInt("spotLightMap", 2);
lightingShader.setFloat("material.shininess", 64.0f);
// lightingShader.setVec3("light.position", lightPos);
lightColor = glm::vec3(1.0f, 1.0f, 1.0f);
glm::vec3 light_diffuse_color = lightColor * glm::vec3(0.6f);
lightingShader.setVec3("dirLight.direction", -0.2f, -1.0f, -0.3f);
lightingShader.setVec3("dirLight.ambient_intensity", light_diffuse_color * glm::vec3(0.1f));
lightingShader.setVec3("dirLight.diffuse_intensity", light_diffuse_color);
lightingShader.setVec3("dirLight.specular_intensity", lightColor * glm::vec3(1.0f));
for (int i = 0; i < 4; i++) {
lightingShader.setVec3("pointLights[" + std::to_string(i) + "].position", pointLightPositions[i]);
lightingShader.setVec3("pointLights[" + std::to_string(i) + "].ambient_intensity", light_diffuse_color * glm::vec3(0.2f));
lightingShader.setVec3("pointLights[" + std::to_string(i) + "].diffuse_intensity", light_diffuse_color);
lightingShader.setVec3("pointLights[" + std::to_string(i) + "].specular_intensity", glm::vec3(1.0f));
lightingShader.setFloat("pointLights[" + std::to_string(i) + "].constant", 1.0f);
lightingShader.setFloat("pointLights[" + std::to_string(i) + "].linear", 0.07f);
lightingShader.setFloat("pointLights[" + std::to_string(i) + "].quadratic", 0.032f);
}
lightingShader.setVec3("spotLight.position", myCamera.Position);
lightingShader.setVec3("spotLight.direction", myCamera.Front);
lightingShader.setFloat("spotLight.cutOff", glm::cos(glm::radians(12.5f)));
lightingShader.setFloat("spotLight.outerCutOff", glm::cos(glm::radians(17.5f)));
lightingShader.setVec3("spotLight.ambient_intensity", light_diffuse_color * glm::vec3(0.2f));
lightingShader.setVec3("spotLight.diffuse_intensity", light_diffuse_color);
lightingShader.setVec3("spotLight.specular_intensity", lightColor * glm::vec3(1.0f, 1.0f, 1.0f));
lightingShader.setFloat("spotLight.constant", 1.0f);
lightingShader.setFloat("spotLight.linear", 0.07f);
lightingShader.setFloat("spotLight.quadratic", 0.032f);
lightingShader.setVec3("viewPos", myCamera.Position);
glm::mat4 view = myCamera.getViewMatrix();
glm::mat4 projection(1.0f);
projection = glm::perspective(glm::radians(myCamera.FOV), (float)WINDOW_WIDTH / WINDOW_HEIGHT, 0.1f, 100.0f);
lightingShader.setMat4("view", view);
lightingShader.setMat4("projection", projection);
for (int i = 0; i < sizeof(cubePositions) / sizeof(glm::vec3); i++)
{
float angle = i * 20.0f;
glm::mat4 model(1.0f);
model = glm::translate(model, cubePositions[i]);
model = glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
glm::mat3 normalMatrix = glm::transpose(glm::inverse(model));
lightingShader.setMat4("model", model);
lightingShader.setMat3("normalMatrix", normalMatrix);
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
}
/* ----------- Light Source ----------- */
for (int i = 0; i < sizeof(pointLightPositions) / sizeof(glm::vec3); i++)
{
glm::mat4 model(1.0f);
model = glm::translate(model, pointLightPositions[i]);
model = glm::scale(model, glm::vec3(0.2f));
lightSourceShader.Use();
glm::mat4 PVM = projection * view * model;
lightSourceShader.setMat4("PVM", PVM);
lightSourceShader.setVec3("lightColor", lightColor);
glBindVertexArray(lightSourceVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
}
// check and calls events and swap the buffers
glfwSwapBuffers(window);
glfwPollEvents();
}
glDeleteVertexArrays(1, &lightSourceVAO);
glDeleteVertexArrays(1, &cubeVAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();
return 0;
}
uint8_t init(void) {
// init of glfw window
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "6. Multiple Lights", NULL, NULL);
if (window == NULL) {
cerr << "Failed to create glfw window" << endl;
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// init of GLAD
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
cerr << "Failed to initialize GLAD" << endl;
}
glfwSetFramebufferSizeCallback(window, framebuffersize_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
return 0;
}
void framebuffersize_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
WINDOW_HEIGHT = height;
WINDOW_WIDTH = width;
}
void proccessInput(GLFWwindow* window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
if (glfwGetKey(window, GLFW_KEY_F1) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
if (glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
/* -------------------- Movement -------------------- */
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_FORWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_BACKWARD, deltaTime);
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_RIGHT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_LEFT, deltaTime);
if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_DOWN, deltaTime);
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
myCamera.ProccessKeyboard(CAM_UP, deltaTime);
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstmouse) {
lastX = xpos;
lastY = ypos;
firstmouse = false;
}
float xoffset = xpos - lastX;
float yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
myCamera.ProccessMouse(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
myCamera.ProccessScroll(yoffset);
}
unsigned int load_texture(const char* path, bool flip)
{
unsigned int texture = 0;
int width, height, nrChannels, format;
stbi_set_flip_vertically_on_load(flip);
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0); // load image to the array of bytes (char = 1 byte)
switch (nrChannels)
{
case 4: format = GL_RGBA; break;
case 3: format = GL_RGB; break;
case 2: format = GL_RED; break;
default: format = GL_RGB; break;
}
if (data) // data != NULL
{
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data); // generates texture
glGenerateMipmap(GL_TEXTURE_2D);
}
else {
cerr << "Could not load texture '" << path << "'\n";
}
stbi_image_free(data);
return texture;
}

132
lessons/2. Lighting/6. Multiple Lights/src/shaders/fragmentShader.frag Normal file
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#version 330 core
struct Material {
sampler2D diffuse_map;
sampler2D specular_map;
float shininess;
};
struct DirLight {
vec3 direction;
vec3 ambient_intensity;
vec3 diffuse_intensity;
vec3 specular_intensity;
};
struct PointLight {
vec3 position;
vec3 ambient_intensity;
vec3 diffuse_intensity;
vec3 specular_intensity;
float constant;
float linear;
float quadratic;
};
struct SpotLight {
vec3 position;
vec3 direction;
vec3 ambient_intensity;
vec3 diffuse_intensity;
vec3 specular_intensity;
float constant;
float linear;
float quadratic;
float cutOff;
float outerCutOff;
};
out vec4 FragColor;
uniform vec3 viewPos;
uniform Material material;
#define NR_POINT_LIGHTS 4
uniform SpotLight spotLight;
uniform DirLight dirLight;
uniform PointLight pointLights[NR_POINT_LIGHTS];
in vec3 Normal;
in vec3 FragPos;
in vec2 TexCoord;
vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir);
vec3 CalcPointLight(PointLight light, vec3 normal, vec3 viewDir, vec3 fragPos);
vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 viewDir, vec3 fragPos);
void main()
{
vec3 normal = normalize(Normal);
vec3 viewDir = normalize(viewPos - FragPos);
vec3 result = CalcDirLight(dirLight, normal, viewDir);
for (int i = 0; i < NR_POINT_LIGHTS; i++)
result += CalcPointLight(pointLights[i], normal, viewDir, FragPos);
result += CalcSpotLight(spotLight, normal, viewDir, FragPos);
FragColor = vec4(result, 1.0);
}
vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir)
{
vec3 lightDir = normalize(-light.direction);
float diff = max(dot(lightDir, normal), 0.0f);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
vec3 ambient = light.ambient_intensity * vec3(texture(material.diffuse_map, TexCoord));
vec3 diffuse = light.diffuse_intensity * diff * vec3(texture(material.diffuse_map, TexCoord));
vec3 specular = light.specular_intensity * spec * vec3(texture(material.specular_map, TexCoord));
return (ambient + diffuse + specular);
}
vec3 CalcPointLight(PointLight light, vec3 normal, vec3 viewDir, vec3 fragPos)
{
vec3 lightDir = normalize(light.position - fragPos); // direction towards light source
float diff = max(dot(lightDir, normal), 0.0f);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
vec3 ambient = light.ambient_intensity * vec3(texture(material.diffuse_map, TexCoord));
vec3 diffuse = light.diffuse_intensity * diff * vec3(texture(material.diffuse_map, TexCoord));
vec3 specular = light.specular_intensity * spec * vec3(texture(material.specular_map, TexCoord));
float frag_dist = length(light.position - fragPos); // fragment distance from light source position
float attenuation = 1.0 / (light.constant + light.linear * frag_dist + light.quadratic * frag_dist * frag_dist);
return (ambient + diffuse + specular) * attenuation;
}
vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 viewDir, vec3 fragPos)
{
vec3 lightDir = normalize(light.position - fragPos); // direction towards light source
float diff = max(dot(lightDir, normal), 0.0f);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
vec3 ambient = light.ambient_intensity * vec3(texture(material.diffuse_map, TexCoord));
vec3 diffuse = light.diffuse_intensity * diff * vec3(texture(material.diffuse_map, TexCoord));
vec3 specular = light.specular_intensity * spec * vec3(texture(material.specular_map, TexCoord));
float dist = length(light.position - FragPos);
float attenuation = 1.0 / (light.constant + light.linear * dist + light.quadratic * (dist * dist));
float theta = dot(lightDir, normalize(-light.direction));
float epsilon = light.cutOff - light.outerCutOff;
float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0, 1.0);
//float intensity = smoothstep(0.0, 1.0, (theta - light.outerCutOff) / epsilon);
diffuse *= attenuation * intensity;
specular *= attenuation * intensity;
return (ambient + diffuse + specular);
}

10
lessons/2. Lighting/6. Multiple Lights/src/shaders/lightSource.frag Normal file
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#version 330 core
out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0f);
}

10
lessons/2. Lighting/6. Multiple Lights/src/shaders/lightSource.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
uniform mat4 PVM;
void main()
{
gl_Position = PVM * vec4(aPos.xyz, 1.0);
}

22
lessons/2. Lighting/6. Multiple Lights/src/shaders/vertexShader.vert Normal file
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#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
layout (location = 2) in vec2 aTexCoord;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
uniform mat3 normalMatrix;
out vec3 Normal;
out vec3 FragPos;
out vec2 TexCoord;
void main()
{
gl_Position = projection * view * model * vec4(aPos.xyz, 1.0);
Normal = normalMatrix * aNormal;
FragPos = vec3(model * vec4(aPos, 1.0));
TexCoord = aTexCoord;
}