Implemented a custom logger

src/framebuffer.cpp

@@ -1,7 +1,7 @@
-#include <iostream>
 #include <utility>
 
 #include "framebuffer.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -35,10 +35,11 @@ Rc<FrameBuffer> FrameBuffer::create(GLsizei width, GLsizei height)
         glDeleteRenderbuffers(1, &render_buffer);
         glDeleteTextures(1, &texture);
         glDeleteFramebuffers(1, &id);
-        std::cerr << "ERROR: FRAMEBUFFER: Could not create incomplete framebuffer" << std::endl;
+        Log::error() << "Could not create incomplete framebuffer";
         return nullptr;
     }
 
+    Log::info() << "Created framebuffer (" << width << "x" << height << ")";
     return make_rc<FrameBuffer>(id, width, height, texture, render_buffer);
 }
 

src/loader.cpp

@@ -1,9 +1,9 @@
 #include <filesystem>
-#include <iostream>
 #include <unordered_map>
 #include <tiny_obj_loader.h>
 
 #include "loader.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -41,7 +41,7 @@ Opt<Entity> load_obj(const std::string& file_path, Rc<Shader> shader)
     bool ok = tinyobj::LoadObj(&attrib, &shapes, &materials, &err,
                                file_path.c_str(), base_dir.c_str());
     if (!ok) {
-        std::cerr << "ERROR: LOAD_OBJ: Could not load " << file_path << ": " << err;
+        Log::error() << "Could not load " << file_path << ": " << err;
         return std::nullopt;
     }
 
@@ -60,15 +60,13 @@ Opt<Entity> load_obj(const std::string& file_path, Rc<Shader> shader)
         if (!mtl.diffuse_texname.empty()) {
             mat->diffuse_map = Texture::create(base_dir + mtl.diffuse_texname);
             if (!mat->diffuse_map) {
-                std::cerr << "WARNING: LOAD_OBJ: Could not create diffuse texture: "
+                Log::warn() << "Could not create diffuse texture " << mtl.diffuse_texname;
-                          << mtl.diffuse_texname << std::endl;
             }
         }
         if (!mtl.specular_texname.empty()) {
             mat->specular_map = Texture::create(base_dir + mtl.specular_texname);
             if (!mat->specular_map) {
-                std::cerr << "WARNING: LOAD_OBJ: Could not create specular texture: "
+                Log::warn() << "Could not create specular texture" << mtl.specular_texname;
-                          << mtl.specular_texname << std::endl;
             }
         }
 
@@ -152,10 +150,13 @@ Opt<Entity> load_obj(const std::string& file_path, Rc<Shader> shader)
 
     auto mesh = Mesh::create(vertices, all_indices, submeshes);
     if (!mesh) {
-        std::cerr << "ERROR: LOAD_OBJ: Could not create mesh" << std::endl;
+        Log::error() << "Could not create mesh for " << file_path;
         return std::nullopt;
     }
 
+    Log::info() << "Loaded " << file_path << " ("
+                << attrib.vertices.size() << " vertices, "
+                << materials.size() << " materials)";
     return Entity{mesh};
 }
 

src/logger.hpp

@@ -0,0 +1,87 @@
+#ifndef FAN_LOGGER_HPP_
+#define FAN_LOGGER_HPP_
+
+#include <ctime>
+#include <iostream>
+#include <iomanip>
+
+namespace Fan
+{
+
+enum class LogLevel
+{
+    Trace = 0,
+    Debug,
+    Info,
+    Warn,
+    Error,
+    Fatal,
+    Off,
+};
+
+class LogStream
+{
+public:
+    LogStream(LogLevel level, bool enabled = true)
+        : m_enabled(enabled)
+    {
+        if (!m_enabled) { return; }
+
+        const char* color = "\033[37m"; // White
+        const char* prefix = "[TRACE]";
+
+        switch (level) {
+            case LogLevel::Debug: color = "\033[36m"; prefix = "[DEBUG]"; break; // Cyan
+            case LogLevel::Info:  color = "\033[32m"; prefix = "[INFO] "; break; // Green
+            case LogLevel::Warn:  color = "\033[33m"; prefix = "[WARN] "; break; // Yellow
+            case LogLevel::Error: color = "\033[31m"; prefix = "[ERROR]"; break; // Red
+            case LogLevel::Fatal: color = "\033[35m"; prefix = "[FATAL]"; break; // Magenta
+            default: break;
+        }
+
+        std::time_t t = std::time(nullptr);
+        std::tm tm = *std::localtime(&t);
+
+        // Print header: [HH:MM:SS] [LEVEL]
+        std::cout << color << "[" << std::put_time(&tm, "%H:%M:%S") << "] " << prefix << " ";
+    }
+
+    ~LogStream()
+    {
+        if (m_enabled) {
+            std::cout << "\033[0m\n"; // Reset color and print newline
+        }
+    }
+
+    template<typename T>
+    LogStream& operator<<(const T& msg)
+    {
+        if (m_enabled) {
+            std::cout << msg;
+        }
+
+        return *this;
+    }
+
+private:
+    bool m_enabled{};
+};
+
+class Log
+{
+public:
+    static inline LogLevel level = LogLevel::Trace;
+
+    static void set_level(LogLevel new_level) { level = new_level; }
+
+    static LogStream trace() { return LogStream(LogLevel::Trace, LogLevel::Trace >= level); }
+    static LogStream debug() { return LogStream(LogLevel::Debug, LogLevel::Debug >= level); }
+    static LogStream info()  { return LogStream(LogLevel::Info,  LogLevel::Info  >= level); }
+    static LogStream warn()  { return LogStream(LogLevel::Warn,  LogLevel::Warn  >= level); }
+    static LogStream error() { return LogStream(LogLevel::Error, LogLevel::Error >= level); }
+    static LogStream fatal() { return LogStream(LogLevel::Fatal, LogLevel::Fatal >= level); }
+};
+
+} // namespace Fan
+
+#endif // FAN_LOGGER_HPP_

src/main.cpp

@@ -41,7 +41,7 @@ void add_random_lights(Scene& scene, int point_light_count, int spot_light_count
                        unsigned int seed = std::random_device{}());
 std::vector<Vertex> get_cube_vertices();
 
-template <typename... Args>
+template<typename... Args>
 void overlay_text(float offset_x, float offset_y, ImVec4 color, const char* format, Args... args)
 {
     char buffer[256];

src/mesh.cpp

@@ -2,6 +2,7 @@
 #include <utility>
 
 #include "mesh.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -50,6 +51,7 @@ Rc<Mesh> Mesh::create(const std::vector<Vertex>& vertices,
         final_submeshes.push_back(default_submesh);
     }
 
+    Log::debug() << "Created mesh (VAO " << VAO << ")";
     return make_rc<Mesh>(vertices, indices, final_submeshes, has_indices, VBO, VAO, EBO);
 }
 

src/renderer.cpp

@@ -1,10 +1,10 @@
-#include <iostream>
 #include <algorithm>
 #include <string>
 #include <unordered_map>
 #include <glad/gl.h>
 
 #include "renderer.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -178,8 +178,7 @@ void Renderer::update_global_data(const Scene& scene, const Camera& camera, int
 
     // Map PointLights
     if (light_data.active_point_lights > MAX_POINT_LIGHTS) {
-        std::cerr << "WARNING: RENDERER: Maximum number of point lights reached"
+        Log::warn() << "Maximum number of point lights reached (" << MAX_POINT_LIGHTS << ")";
-                  << " (" << MAX_POINT_LIGHTS << ")" << std::endl;
     }
     light_data.active_point_lights = std::min(static_cast<int>(env.point_lights.size()), MAX_POINT_LIGHTS);
     for (int i = 0; i < light_data.active_point_lights; ++i) {
@@ -194,8 +193,7 @@ void Renderer::update_global_data(const Scene& scene, const Camera& camera, int
 
     // Map SpotLights
     if (light_data.active_spot_lights > MAX_SPOT_LIGHTS) {
-        std::cerr << "WARNING: RENDERER: Maximum number of spot lights reached"
+        Log::warn() << "Maximum number of spot lights reached (" << MAX_SPOT_LIGHTS << ")";
-                  << " (" << MAX_SPOT_LIGHTS << ")" << std::endl;
     }
     light_data.active_spot_lights = std::min(static_cast<int>(env.spot_lights.size()), MAX_SPOT_LIGHTS);
     for (int i = 0; i < light_data.active_spot_lights; ++i) {

src/shader.cpp

@@ -1,9 +1,9 @@
-#include <iostream>
 #include <utility>
 #include <glm/gtc/type_ptr.hpp>
 
 #include "shader.hpp"
 #include "utils.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -40,7 +40,7 @@ Rc<Shader> Shader::create(const std::string& vertex_shader_path,
         if (log_length > 0) {
             std::string log(log_length, ' ');
             glGetProgramInfoLog(shader_program, log_length, nullptr, &log[0]);
-            std::cerr << "ERROR: SHADER: Could not link shader program: " << log << std::endl;
+            Log::error() << "Could not link shader program: " << log;
         }
 
         glDeleteProgram(shader_program);
@@ -54,6 +54,8 @@ Rc<Shader> Shader::create(const std::string& vertex_shader_path,
         shader->bind_uniform_block("LightEnvironmentBlock", BindingPoint::LightEnvironment);
     }
 
+    Log::info() << "Created shader (" << vertex_shader_path << ", "
+                                      << fragment_shader_path << ")";
     return shader;
 }
 
@@ -85,7 +87,7 @@ GLint Shader::get_location(const std::string &name)
 {
     GLint location = glGetUniformLocation(m_id, name.c_str());
     if (location == -1) {
-        std::cerr << "WARNING: SHADER: uniform " << name << " not found" << std::endl;
+        Log::warn() << "Uniform " << name << " not found";
     }
     return location;
 }
@@ -121,7 +123,7 @@ Opt<GLuint> Shader::compile_shader(const std::string& source_path,
 {
     auto shader_source = read_entire_file(source_path);
     if (!shader_source) {
-        std::cerr << "ERROR: SHADER: Could not read shader " << source_path << std::endl;
+        Log::error() << "Could not read shader " << source_path;
         return std::nullopt;
     }
 
@@ -139,7 +141,7 @@ Opt<GLuint> Shader::compile_shader(const std::string& source_path,
         if (log_length > 0) {
             std::string log(log_length, ' ');
             glGetShaderInfoLog(shader, log_length, nullptr, &log[0]);
-            std::cerr << "ERROR: SHADER: Could not compile shader: " << log << std::endl;
+            Log::error() << "Could not compile shader: " << log;
         }
 
         glDeleteShader(shader);
@@ -163,8 +165,7 @@ void Shader::bind_uniform_block(const std::string& name, GLuint binding_point) c
     GLuint block_index = glGetUniformBlockIndex(m_id, name.c_str());
 
     if (block_index == GL_INVALID_INDEX) {
-        std::cerr << "ERROR: SHADER: Uniform block not found: "
+        Log::error() << "Uniform block not found: " << name;
-                  << name << std::endl;
         return;
     }
 

src/texture.cpp

@@ -1,7 +1,7 @@
-#include <iostream>
 #include <stb_image.h>
 
 #include "texture.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -13,14 +13,14 @@ Rc<Texture> Texture::create(const std::string& image_path)
     int width, height, n_channels;
     stbi_uc *image_data = stbi_load(image_path.c_str(), &width, &height, &n_channels, STBI_rgb_alpha);
     if (image_data == NULL) {
-        std::cerr << "ERROR: TEXTURE: Could not load image " << image_path << std::endl;
+        Log::error() << "Could not load texture image " << image_path;
         return nullptr;
     }
 
     GLuint texture;
     glGenTextures(1, &texture);
     if (glGetError() != GL_NO_ERROR) {
-        std::cerr << "ERROR: TEXTURE: glGenTextures" << std::endl;
+        Log::error() << "glGenTextures failed";
         stbi_image_free(image_data);
         return nullptr;
     }

src/uniformbuffer.cpp

@@ -1,7 +1,7 @@
-#include <iostream>
 #include <utility>
 
 #include "uniformbuffer.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -19,7 +19,7 @@ Rc<UniformBuffer> UniformBuffer::create(size_t size, GLuint binding_point)
 
     GLenum err = glGetError();
     if (err != GL_NO_ERROR) {
-        std::cerr << "ERROR: UNIFORMBUFFER: Could not create uniformbuffer" << std::endl;
+        Log::error() << "Could not create uniformbuffer";
         glDeleteBuffers(1, &id);
         return nullptr;
     }
@@ -53,12 +53,12 @@ UniformBuffer& UniformBuffer::operator=(UniformBuffer&& other) noexcept
 void UniformBuffer::update(const void* data, size_t size, size_t offset) const
 {
     if (size + offset > m_size) {
-        std::cerr << "ERROR: UNIFORMBUFFER: Attempted to upload data outside of bounds on update" << std::endl;
+        Log::error() << "Attempted to upload uniformbuffer data outside of bounds";
         return;
     }
 
-    if (!data) {
+    if (data == nullptr) {
-        std::cerr << "ERROR: UNIFORMBUFFER: Provided null data pointer on update" << std::endl;
+        Log::error() << "Provided null data pointer on uniform buffer update";
         return;
     }
 

src/utils.hpp

@@ -8,16 +8,16 @@
 namespace Fan
 {
 
-template <typename T>
+template<typename T>
 using Rc = std::shared_ptr<T>;
 
-template <typename T, typename... Args>
+template<typename T, typename... Args>
 Rc<T> make_rc(Args&&... args)
 {
     return std::make_shared<T>(std::forward<Args>(args)...);
 }
 
-template <typename T>
+template<typename T>
 using Opt = std::optional<T>;
 
 Opt<std::string> read_entire_file(const std::string& file_path);

src/window.cpp

@@ -1,4 +1,3 @@
-#include <iostream>
 #include <utility>
 #include <glad/gl.h>
 #include <imgui.h>
@@ -6,6 +5,7 @@
 #include <imgui_impl_opengl3.h>
 
 #include "window.hpp"
+#include "logger.hpp"
 
 namespace Fan
 {
@@ -15,7 +15,7 @@ Rc<Window> Window::create(int width, int height, const std::string& title)
     glfwSetErrorCallback(error_callback);
 
     if (!glfwInit()) {
-        std::cerr << "ERROR: WINDOW: Could not initialize GLFW" << std::endl;
+        Log::error() << "Could not initialize GLFW";
         return nullptr;
     }
 
@@ -26,7 +26,7 @@ Rc<Window> Window::create(int width, int height, const std::string& title)
 
     GLFWwindow *window = glfwCreateWindow(width, height, title.c_str(), nullptr, nullptr);
     if (window == nullptr) {
-        std::cerr << "ERROR: WINDOW: Could not create window" << std::endl;
+        Log::error() << "Could not create window";
         glfwTerminate();
         return nullptr;
     }
@@ -37,7 +37,7 @@ Rc<Window> Window::create(int width, int height, const std::string& title)
     glfwSetInputMode(window, GLFW_RAW_MOUSE_MOTION, GLFW_TRUE);
 
     if (!gladLoadGL(glfwGetProcAddress)) {
-        std::cerr << "ERROR: WINDOW: Could not initialize OpenGL context" << std::endl;
+        Log::error() << "Could not initialize OpenGL context";
         glfwDestroyWindow(window);
         glfwTerminate();
         return nullptr;
@@ -58,6 +58,7 @@ Rc<Window> Window::create(int width, int height, const std::string& title)
     ImGui_ImplGlfw_InitForOpenGL(window, true);
     ImGui_ImplOpenGL3_Init();
 
+    Log::info() << "Created window";
     return make_rc<Window>(window, width, height);
 }
 
@@ -251,7 +252,7 @@ void Window::end()
 
 void Window::error_callback(int error, const char* description)
 {
-    std::cerr << "ERROR: WINDOW: GLFW: code: " << error << " msg: " << description << std::endl;
+    Log::error() << "GLFW code: " << error << " msg: " << description;
 }
 
 void Window::framebuffer_size_callback(GLFWwindow* window, int width, int height)