feat: add logger class

src/buffer.cpp

@@ -1,11 +1,11 @@
 #include "buffer.h"
 
 #include <vector>
-#include <iostream>
 
 #include "../lib/glew/GL/glew.h"
 #include "../lib/glfw/glfw3.h"
 
+#include "logger.h"
 #include "vertex.h"
 
 Buffer::Buffer(const std::vector<Vertex>&   vertices,
@@ -30,6 +30,9 @@ Buffer::Buffer(const std::vector<Vertex>&   vertices,
 	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
 			      nullptr);
 	glEnableVertexAttribArray(0);
+
+	Logger::info(sstr("Buffer created with ", vertices.size(),
+			  " vertices and ", indices.size(), " indices"));
 }
 
 Buffer::~Buffer()
@@ -37,6 +40,7 @@ Buffer::~Buffer()
 	glDeleteVertexArrays(1, &vao_);
 	glDeleteBuffers(1, &vbo_);
 	glDeleteBuffers(1, &ebo_);
+	Logger::info("Buffer destroyed");
 }
 
 void Buffer::draw(const Shader& shader) const

src/engine.cpp

@@ -1,6 +1,5 @@
 #include "engine.h"
 
-#include <iostream>
 #include <vector>
 
 #include "../lib/glew/GL/glew.h"
@@ -10,6 +9,7 @@
 
 #include "buffer.h"
 #include "camera.h"
+#include "logger.h"
 #include "mesh.h"
 #include "model.h"
 #include "shader.h"
@@ -17,32 +17,37 @@
 #include "vertex.h"
 #include "world.h"
 
-constexpr int	 SCREEN_WIDTH  = 800;
+constexpr int	 screen_width  = 800;
-constexpr int	 SCREEN_HEIGHT = 600;
+constexpr int	 screen_height = 600;
-constexpr double FPS_LIMIT     = 1.0 / 60.0;
+constexpr double fps_limit     = 1.0 / 60.0;
 
 Engine::Engine()
     : window_(nullptr)
-    , screen_width_(SCREEN_WIDTH)
+    , screen_width_(screen_width)
-    , screen_height_(SCREEN_HEIGHT)
+    , screen_height_(screen_height)
     , last_update_time_(0.0)
     , last_frame_time_(0.0)
     , angle_(0.0)
 {
+	Logger::info("Engine created");
 }
 
 Engine::~Engine()
 {
+	Logger::info("Engine destroyed");
 	destroy();
 }
 
 void Engine::initialize()
 {
+	Logger::info("Initializing engine...");
+
 	// Initialize GLFW
 	if (!glfwInit()) {
-		std::cerr << "Failed to initialize GLFW\n";
+		Logger::error("Failed to initialize GLFW");
 		return;
 	}
+	Logger::info("GLFW initialized successfully");
 
 	glfwWindowHint(GLFW_RESIZABLE, false);
 	glfwWindowHint(GLFW_SAMPLES, 8);
@@ -51,7 +56,7 @@ void Engine::initialize()
 	window_ = glfwCreateWindow(screen_width_, screen_height_,
 				   "Daniel Poveda", nullptr, nullptr);
 	if (window_ == nullptr) {
-		std::cerr << "Failed to create OpenGL window\n";
+		Logger::error("Failed to create OpenGL window");
 		glfwTerminate();
 		return;
 	}
@@ -61,30 +66,39 @@ void Engine::initialize()
 	glEnable(GL_DEPTH_TEST);
 	glEnable(GL_SCISSOR_TEST);
 
-	std::cout << "OpenGL initialized, version: " << glGetString(GL_VERSION)
+	Logger::info(
-		  << "\n";
+	    sstr("OpenGL initialized, version: ",
+		 reinterpret_cast<const char*>(glGetString(GL_VERSION))));
 
 	// Initialize GLEW
 	glewExperimental = GL_TRUE;
 	GLenum err	 = glewInit();
 	if (err != GLEW_OK) {
-		std::cerr << "Failed to initialize GLEW: "
+		Logger::error(sstr(
-			  << glewGetErrorString(err) << "\n";
+		    "Failed to initialize GLEW: ",
+		    reinterpret_cast<const char*>(glewGetErrorString(err))));
 		glfwTerminate();
 		return;
 	}
 
 	// Initialize default shader
+	Logger::info("Loading default shaders...");
 	state::default_shader =
 	    std::make_shared<Shader>("data/vertex.glsl", "data/fragment.glsl");
 	if (std::strlen(state::default_shader->error()) > 0) {
-		std::cerr << "Failed to initialize shaders: "
+		Logger::error(sstr("Failed to initialize shaders: ",
-			  << state::default_shader->error() << "\n";
+				   state::default_shader->error()));
+	} else {
+		Logger::info("Default shaders loaded successfully");
 	}
+
+	Logger::info("Engine initialization complete");
 }
 
 void Engine::run()
 {
+	Logger::info("Starting game loop...");
+
 	setup();
 	start();
 
@@ -98,26 +112,33 @@ void Engine::run()
 		process_input();
 		update(delta_time);
 
-		if (now - last_frame_time_ >= FPS_LIMIT) {
+		if (now - last_frame_time_ >= fps_limit) {
 			render();
 			last_frame_time_ = now;
 		}
 		last_update_time_ = now;
 	}
+
+	Logger::info("Game loop ended");
 }
 
 void Engine::destroy()
 {
 	if (window_) {
+		Logger::info("Shutting down engine...");
 		glfwTerminate();
 		window_ = nullptr;
+		Logger::info("Engine shutdown complete");
 	}
 }
 
 void Engine::setup()
 {
+	Logger::info("Setting up scene...");
+
 	// Create world
 	world_ = std::make_unique<World>();
+	Logger::info("World created");
 
 	// Create camera
 	camera_ = std::make_shared<Camera>();
@@ -130,6 +151,7 @@ void Engine::setup()
 	camera_->set_viewport(glm::ivec4(0, 0, screen_width_, screen_height_));
 	camera_->set_clear_color(glm::vec3(0.1f, 0.1f, 0.1f));
 	world_->add_entity(camera_);
+	Logger::info("Camera created and added to world");
 
 	// Create triangle mesh
 	std::vector<Vertex> vertices = {
@@ -141,6 +163,8 @@ void Engine::setup()
 	auto buffer = std::make_shared<Buffer>(vertices, indices);
 	mesh_	    = std::make_shared<Mesh>();
 	mesh_->add_buffer(buffer);
+	Logger::info(sstr("Mesh created with ", vertices.size(),
+			  " vertices and ", indices.size(), " indices"));
 
 	// Create 9 models in a 3x3 grid
 	for (int row = 0; row < 3; ++row) {
@@ -153,6 +177,8 @@ void Engine::setup()
 			world_->add_entity(model);
 		}
 	}
+	Logger::info(sstr("Created ", models_.size(), " models in scene"));
+	Logger::info("Scene setup complete");
 }
 
 void Engine::start()

src/logger.cpp

@@ -0,0 +1,57 @@
+#include "logger.h"
+
+#include <chrono>
+#include <iostream>
+
+namespace {
+
+std::string current_datetime_string()
+{
+	auto	  now	     = std::chrono::system_clock::now();
+	auto	  now_time_t = std::chrono::system_clock::to_time_t(now);
+	struct tm now_tm {};
+#ifdef _WIN32
+	localtime_s(&now_tm, &now_time_t);
+#else
+	localtime_r(&now_time_t, &now_tm);
+#endif
+
+	char buffer[30];
+	std::strftime(buffer, sizeof(buffer) / sizeof(char), "%Y-%m-%d %H:%M:%S",
+		      &now_tm);
+	return std::string{buffer};
+}
+
+} // namespace
+
+void Logger::info(const std::string& message)
+{
+	LogEntry entry;
+	entry.type = LogType::info;
+	entry.message =
+	    "[" + current_datetime_string() + "] [INFO]: " + message;
+
+	std::cout << "\x1B[32m" << entry.message << "\033[0m" << std::endl;
+	messages_.push_back(entry);
+}
+
+void Logger::warn(const std::string& message)
+{
+	LogEntry entry;
+	entry.type = LogType::warn;
+	entry.message =
+	    "[" + current_datetime_string() + "] [WARN]: " + message;
+
+	std::cout << "\x1B[93m" << entry.message << "\033[0m" << std::endl;
+	messages_.push_back(entry);
+}
+
+void Logger::error(const std::string& message)
+{
+	LogEntry entry;
+	entry.type	= LogType::error;
+	entry.message = "[" + current_datetime_string() + "] [ERROR]: " + message;
+
+	std::cerr << "\x1B[91m" << entry.message << "\033[0m" << std::endl;
+	messages_.push_back(entry);
+}

src/logger.h

@@ -0,0 +1,48 @@
+#ifndef LOGGER_H_
+#define LOGGER_H_
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+// Utility: Concatenate any types into a string
+template <typename... Args>
+std::string sstr(Args&&... args)
+{
+	std::ostringstream stream;
+	stream << std::dec;
+	((stream << args), ...);
+	return stream.str();
+}
+
+// Log types
+enum class LogType {
+	info = 0,
+	warn,
+	error
+};
+
+// Log entry structure
+struct LogEntry {
+	LogType	    type{LogType::info};
+	std::string message{};
+};
+
+// Logger class
+class Logger {
+public:
+	static void info(const std::string& message);
+	static void warn(const std::string& message);
+	static void error(const std::string& message);
+
+	[[nodiscard]] static const std::vector<LogEntry>& messages()
+	{
+		return messages_;
+	}
+	static void clear() { messages_.clear(); }
+
+private:
+	inline static std::vector<LogEntry> messages_{};
+};
+
+#endif // LOGGER_H_

src/shader.cpp

@@ -1,13 +1,13 @@
 #include "shader.h"
 
-#include <vector>
 #include <fstream>
 #include <sstream>
-#include <iostream>
+#include <vector>
 
 #include "../lib/glew/GL/glew.h"
 #include "../lib/glfw/glfw3.h"
 
+#include "logger.h"
 #include "vertex.h"
 
 Shader::Shader(const std::string& vertexPath, const std::string& fragmentPath)
@@ -106,7 +106,8 @@ std::string Shader::read_shader_file(const std::string& filename)
 {
 	std::ifstream file(filename);
 	if (!file) {
-		error_ = "Failed to open shader file: " + filename + "\n";
+		error_ = "Failed to open shader file: " + filename;
+		Logger::error(sstr("Failed to open shader file: ", filename));
 		return std::string{0};
 	}
 
@@ -117,11 +118,16 @@ std::string Shader::read_shader_file(const std::string& filename)
 
 uint32_t Shader::compile_shader(uint32_t type, const std::string& source_path)
 {
+	const char* shader_type_name =
+	    (type == GL_VERTEX_SHADER) ? "vertex" : "fragment";
+
 	std::string source = read_shader_file(source_path);
-	// std::cout << "SHADER FILE: " << source << "\n";
 	if (source.empty())
 		return 0;
 
+	Logger::info(
+	    sstr("Compiling ", shader_type_name, " shader: ", source_path));
+
 	const uint32_t shader	   = glCreateShader(type);
 	const char*    shader_code = source.c_str();
 
@@ -135,9 +141,13 @@ uint32_t Shader::compile_shader(uint32_t type, const std::string& source_path)
 		char buffer[1024];
 		glGetShaderInfoLog(shader, sizeof(buffer), nullptr, buffer);
 		error_ = buffer;
+		Logger::error(
+		    sstr("Shader compilation failed (", shader_type_name, "): ",
+			 buffer));
 		glDeleteShader(shader);
 		return 0;
 	}
 
+	Logger::info(sstr(shader_type_name, " shader compiled successfully"));
 	return shader;
 }

src/world.cpp

@@ -1,8 +1,11 @@
 #include "world.h"
-#include "entity.h"
+
-#include "camera.h"
 #include <algorithm>
 
+#include "camera.h"
+#include "entity.h"
+#include "logger.h"
+
 void World::add_entity(const std::shared_ptr<Entity>& entity)
 {
 	entities_.push_back(entity);
@@ -12,6 +15,11 @@ void World::add_entity(const std::shared_ptr<Entity>& entity)
 	    std::dynamic_pointer_cast<Camera>(entity);
 	if (camera) {
 		cameras_.push_back(camera);
+		Logger::info(sstr("Camera added to world (total cameras: ",
+				  cameras_.size(), ")"));
+	} else {
+		Logger::info(sstr("Entity added to world (total entities: ",
+				  entities_.size(), ")"));
 	}
 }
 
@@ -21,6 +29,7 @@ void World::remove_entity(const std::shared_ptr<Entity>& entity)
 	auto it = std::find(entities_.begin(), entities_.end(), entity);
 	if (it != entities_.end()) {
 		entities_.erase(it);
+		Logger::info("Entity removed from world");
 	}
 
 	// Check if entity is a camera and remove from cameras list
@@ -31,6 +40,7 @@ void World::remove_entity(const std::shared_ptr<Entity>& entity)
 		    std::find(cameras_.begin(), cameras_.end(), camera);
 		if (camIt != cameras_.end()) {
 			cameras_.erase(camIt);
+			Logger::info("Camera removed from world");
 		}
 	}
 }

ugine3d.vcxproj

@@ -163,6 +163,7 @@
     <ClInclude Include="src\camera.h" />
     <ClInclude Include="src\engine.h" />
     <ClInclude Include="src\entity.h" />
+    <ClInclude Include="src\logger.h" />
     <ClInclude Include="src\mesh.h" />
     <ClInclude Include="src\model.h" />
     <ClInclude Include="src\shader.h" />
@@ -176,6 +177,7 @@
     <ClCompile Include="src\camera.cpp" />
     <ClCompile Include="src\engine.cpp" />
     <ClCompile Include="src\entity.cpp" />
+    <ClCompile Include="src\logger.cpp" />
     <ClCompile Include="src\main.cpp" />
     <ClCompile Include="src\mesh.cpp" />
     <ClCompile Include="src\model.cpp" />

ugine3d.vcxproj.filters

@@ -63,6 +63,9 @@
     <ClInclude Include="src\engine.h">
       <Filter>Source Files</Filter>
     </ClInclude>
+    <ClInclude Include="src\logger.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="src\main.cpp">
@@ -98,6 +101,9 @@
     <ClCompile Include="src\engine.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\logger.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="data\fragment.glsl">