Nove repo opengl-learning

2021-02-12 15:43:03 +01:00
commit 63e3c0bc8b
1046 changed files with 358397 additions and 0 deletions
--- a/culling/Makefile
+++ b/culling/Makefile
@@ -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 -lassimp
+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)/*
--- a/culling/src/Camera.cpp
+++ b/culling/src/Camera.cpp
@@ -0,0 +1,83 @@
+#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;
+}
--- a/culling/src/Camera.h
+++ b/culling/src/Camera.h
@@ -0,0 +1,54 @@
+#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();
+};
+
--- a/culling/src/Mesh.cpp
+++ b/culling/src/Mesh.cpp
@@ -0,0 +1,67 @@
+#include <glad/glad.h>
+#include "Mesh.h"
+
+using namespace glml;
+
+Mesh::Mesh(const std::vector<Vertex>& vertices,
+	const std::vector<unsigned int>& indices,
+	const std::vector<Texture>& textures) : vertices(vertices), indices(indices), textures(textures)
+{
+	setupMesh();
+}
+
+void Mesh::setupMesh()
+{
+	glGenVertexArrays(1, &VAO);
+	glGenBuffers(1, &VBO);
+	glGenBuffers(1, &EBO);
+
+	glBindVertexArray(VAO);
+
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
+
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_STATIC_DRAW);
+
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const void*)offsetof(Vertex, Position));
+	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const void*)offsetof(Vertex, Normal));
+	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const void*)offsetof(Vertex, TexCoord));
+	glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const void*)offsetof(Vertex, Tangent));
+	glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const void*)offsetof(Vertex, Bitangent));
+	for (int i = 0; i < 5; i++)
+		glEnableVertexAttribArray(i);
+
+	glBindVertexArray(0);
+}
+
+void Mesh::Draw(Shader& shader) const
+{
+	unsigned int diffNr = 0;
+	unsigned int specNr = 0;
+	unsigned int normNr = 0;
+	unsigned int heigNr = 0;
+
+	for (int i = 0; i < textures.size(); i++)
+	{
+		std::string name = TextureTypeStrings[static_cast<size_t>(textures[i].type)];
+
+		if (textures[i].type == TextureType::diffuse)
+			name += std::to_string(diffNr++);
+		else if (textures[i].type == TextureType::specular)
+			name += std::to_string(specNr++);
+		else if (textures[i].type == TextureType::normal)
+			name += std::to_string(normNr++);
+		else if (textures[i].type == TextureType::height)
+			name += std::to_string(heigNr++);
+
+		glActiveTexture(GL_TEXTURE0 + i);
+		shader.setInt("material." + name, i);
+		glBindTexture(GL_TEXTURE_2D, textures[i].id);
+	}
+	glActiveTexture(GL_TEXTURE0);
+
+	glBindVertexArray(VAO);
+	glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);
+	glBindVertexArray(0);
+}
--- a/culling/src/Mesh.h
+++ b/culling/src/Mesh.h
@@ -0,0 +1,52 @@
+#pragma once
+#include <glm/glm.hpp>
+#include <string>
+#include <vector>
+#include "Shader.h"
+
+namespace glml 
+{
+	static const std::string TextureTypeStrings[] = {
+		"texture_diffuse",
+		"texture_specular",
+		"texture_normal",
+		"texture_height"
+	};
+	enum class TextureType : size_t
+	{
+		diffuse = 0,
+		specular = 1,
+		normal = 2,
+		height = 3
+	};
+
+	struct Vertex {
+		glm::vec3 Position;
+		glm::vec3 Normal;
+		glm::vec2 TexCoord;
+		glm::vec3 Color;
+		glm::vec3 Tangent;
+		glm::vec3 Bitangent;
+	};
+	struct Texture {
+		unsigned int id;
+		TextureType type;
+		std::string path;
+	};
+
+	class Mesh {
+	public:
+		std::vector<Vertex>			vertices;
+		std::vector<unsigned int>	indices;
+		std::vector<Texture>		textures;
+
+		Mesh(const std::vector<Vertex>& vertices, const std::vector<unsigned int>& indices, const std::vector<Texture>& textures);
+
+		void Draw(Shader& shader) const;
+	private:
+		unsigned int VAO, VBO, EBO;
+
+		void setupMesh();
+	};
+};
+
--- a/culling/src/Shader.cpp
+++ b/culling/src/Shader.cpp
@@ -0,0 +1,119 @@
+#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));
+}
--- a/culling/src/Shader.h
+++ b/culling/src/Shader.h
@@ -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);	
+};
+
--- a/culling/src/main.cpp
+++ b/culling/src/main.cpp
@@ -0,0 +1,307 @@
+#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 <vector>
+#include <map>
+#include <algorithm>
+#include "Shader.h"
+#include "Camera.h"
+
+#define TEXTURES_DIR "../../../../textures/"
+#define MODELS_DIR	 "../../../../models/"
+#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, GLint wrapS = GL_REPEAT, GLint wrapT = GL_REPEAT);
+
+int main(int argc, char** argv)
+{
+	if (init() != 0)
+		return -1;		
+	
+	Shader shader(SHADERS_DIR "shader.vert", SHADERS_DIR "shader.frag");	
+
+	std::vector<glm::vec3> windowPositions;
+	windowPositions.push_back(glm::vec3(-1.5f, 0.0f, -0.48f));
+	windowPositions.push_back(glm::vec3(1.5f, 0.0f, 0.51f));
+	windowPositions.push_back(glm::vec3(0.0f, 0.0f, 0.7f));
+	windowPositions.push_back(glm::vec3(-0.3f, 0.0f, -2.3f));
+	windowPositions.push_back(glm::vec3(0.5f, 0.0f, -0.6f));
+
+	float cubeVertices[] = {
+		// back face
+		-0.5f, -0.5f, -0.5f,  0.0f, 0.0f, // bottom-left
+		 0.5f, -0.5f, -0.5f,  1.0f, 0.0f, // bottom-right    
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right              
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right
+		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f, // top-left
+		-0.5f, -0.5f, -0.5f,  0.0f, 0.0f, // bottom-left                
+		// front face
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-left
+		 0.5f,  0.5f,  0.5f,  1.0f, 1.0f, // top-right
+		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f, // bottom-right        
+		 0.5f,  0.5f,  0.5f,  1.0f, 1.0f, // top-right
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-left
+		-0.5f,  0.5f,  0.5f,  0.0f, 1.0f, // top-left        
+		// left face
+		-0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-right
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-left
+		-0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-left       
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-left
+		-0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-right
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-right
+		// right face
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-left
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right      
+		 0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-right          
+		 0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // bottom-right
+		 0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-left
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // top-left
+		// bottom face          
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // top-right
+		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f, // bottom-left
+		 0.5f, -0.5f, -0.5f,  1.0f, 1.0f, // top-left        
+		 0.5f, -0.5f,  0.5f,  1.0f, 0.0f, // bottom-left
+		-0.5f, -0.5f, -0.5f,  0.0f, 1.0f, // top-right
+		-0.5f, -0.5f,  0.5f,  0.0f, 0.0f, // bottom-right
+		// top face
+		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f, // top-left
+		 0.5f,  0.5f, -0.5f,  1.0f, 1.0f, // top-right
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // bottom-right                 
+		 0.5f,  0.5f,  0.5f,  1.0f, 0.0f, // bottom-right
+		-0.5f,  0.5f,  0.5f,  0.0f, 0.0f, // bottom-left  
+		-0.5f,  0.5f, -0.5f,  0.0f, 1.0f  // top-left              
+	};
+	float planeVertices[] = {
+		// positions          // texture Coords (note we set these higher than 1 (together with GL_REPEAT as texture wrapping mode). this will cause the floor texture to repeat)
+		 5.0f, -0.5f,  5.0f,  2.0f, 0.0f,
+		-5.0f, -0.5f,  5.0f,  0.0f, 0.0f,
+		-5.0f, -0.5f, -5.0f,  0.0f, 2.0f,
+
+		 5.0f, -0.5f,  5.0f,  2.0f, 0.0f,
+		-5.0f, -0.5f, -5.0f,  0.0f, 2.0f,
+		 5.0f, -0.5f, -5.0f,  2.0f, 2.0f
+	};
+
+	unsigned int cubeVAO, cubeVBO;
+	glGenVertexArrays(1, &cubeVAO);
+	glGenBuffers(1, &cubeVBO);
+	glBindVertexArray(cubeVAO);
+	glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), cubeVertices, GL_STATIC_DRAW);
+	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);
+
+	unsigned int planeVAO, planeVBO;
+	glGenVertexArrays(1, &planeVAO);
+	glGenBuffers(1, &planeVBO);
+	glBindVertexArray(planeVAO);
+	glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), planeVertices, GL_STATIC_DRAW);
+	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);
+
+	unsigned int cubeTexture = load_texture(TEXTURES_DIR "marble.jpg");
+	unsigned int planeTexture = load_texture(TEXTURES_DIR "metal.png");	
+	
+	shader.Use();
+	shader.setInt("texture1", 0);
+
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LESS);
+
+	/* ------------------ 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);		
+				
+		shader.Use();
+
+		glm::mat4 model(1.0f);
+		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);
+				
+		shader.setMat4("view", view);
+		shader.setMat4("projection", projection);
+
+		glEnable(GL_CULL_FACE);
+		glCullFace(GL_BACK);
+		glFrontFace(GL_CW);
+		// cubes		
+		glBindVertexArray(cubeVAO);
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, cubeTexture);
+		model = glm::translate(model, glm::vec3(-1.0f, 0.05f, -1.0f));
+		shader.setMat4("model", model);
+		glDrawArrays(GL_TRIANGLES, 0, 36);
+		model = glm::translate(glm::mat4(1.0f), glm::vec3(2.0f, 0.05f, 0.0f));
+		shader.setMat4("model", model);
+		glDrawArrays(GL_TRIANGLES, 0, 36);
+
+		glDisable(GL_CULL_FACE);
+		// plane
+		glBindVertexArray(planeVAO);
+		glBindTexture(GL_TEXTURE_2D, planeTexture);
+		shader.setMat4("model", glm::mat4(1.0f));
+		glDrawArrays(GL_TRIANGLES, 0, 6);
+		glBindVertexArray(0);
+
+		// check and calls events and swap the buffers
+		glfwSwapBuffers(window);
+		glfwPollEvents();
+	}
+
+	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. Face culling", 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, GLint wrapS, GLint wrapT)
+{
+	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, wrapS);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapT);		
+		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, format, 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);
+
+	glBindTexture(GL_TEXTURE_2D, 0);
+
+	return texture;
+}
--- a/culling/src/shaders/shader.frag
+++ b/culling/src/shaders/shader.frag
@@ -0,0 +1,23 @@
+#version 330
+
+out vec4 FragColor;
+
+in vec2 TexCoord;
+
+uniform sampler2D texture1;
+uniform float near;
+uniform float far;
+
+float LinearizeDepth(float depth) 
+{
+    float z = depth * 2.0 - 1.0; // back to NDC 
+    return (2.0 * near * far) / (far + near - z * (far - near));	
+}
+
+
+void main()
+{
+	FragColor = texture(texture1, TexCoord);
+	//float depth = LinearizeDepth(gl_FragCoord.z) / far;
+	//FragColor = vec4(vec3(depth), 1.0);
+}
--- a/culling/src/shaders/shader.vert
+++ b/culling/src/shaders/shader.vert
@@ -0,0 +1,16 @@
+#version 330
+
+layout (location = 0) in vec3 aPosition;
+layout (location = 1) in vec2 aTexCoord;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+out vec2 TexCoord;
+
+void main()
+{
+	gl_Position = projection * view * model * vec4(aPosition, 1.0);
+	TexCoord = aTexCoord;
+}