diff --git a/src/framework/configs.cpp b/src/framework/configs.cpp
index 3aa7c085..92f79bfa 100644
--- a/src/framework/configs.cpp
+++ b/src/framework/configs.cpp
@@ -27,7 +27,7 @@
 
 #include <yaml-cpp/yaml.h>
 
-Configs g_config;
+Configs g_configs;
 
 bool Configs::load(const std::string& fileName)
 {
@@ -99,43 +99,43 @@ void Configs::setValue(const std::string &key, bool value)
         setValue(key,"false");
 }
 
-const std::string &Configs::getString(const std::string &key)
+const std::string &Configs::getString(const std::string &key) const
 {
-    auto iter = m_confsMap.find(key);
-    if(iter == m_confsMap.end()) {
+    auto it = m_confsMap.find(key);
+    if(it == m_confsMap.end()) {
         warning("Config value %s not found", key.c_str());
         static std::string emptystr;
         return emptystr;
     }
-    return iter->second;
+    return it->second;
 }
 
-float Configs::getFloat(const std::string &key)
+float Configs::getFloat(const std::string &key) const
 {
-    auto iter = m_confsMap.find(key);
-    if(iter == m_confsMap.end()) {
+    auto it = m_confsMap.find(key);
+    if(it == m_confsMap.end()) {
         warning("Config value %s not found", key.c_str());
         return 0;
     }
-    return convertType<float, std::string>(iter->second);
+    return convertType<float, std::string>(it->second);
 }
 
-bool Configs::getBoolean(const std::string &key)
+bool Configs::getBoolean(const std::string &key) const
 {
-    auto iter = m_confsMap.find(key);
-    if(iter == m_confsMap.end()) {
+    auto it = m_confsMap.find(key);
+    if(it == m_confsMap.end()) {
         warning("Config value %s not found", key.c_str());
         return 0;
     }
-    return (iter->second == "true");
+    return (it->second == "true");
 }
 
-int Configs::getInteger(const std::string &key)
+int Configs::getInteger(const std::string &key) const
 {
-    auto iter = m_confsMap.find(key);
-    if(iter == m_confsMap.end()) {
+    auto it = m_confsMap.find(key);
+    if(it == m_confsMap.end()) {
         warning("Config value %s not found", key.c_str());
         return 0;
     }
-    return convertType<int, std::string>(iter->second);
+    return convertType<int, std::string>(it->second);
 }
diff --git a/src/framework/configs.h b/src/framework/configs.h
index 6bf33a10..f989a62b 100644
--- a/src/framework/configs.h
+++ b/src/framework/configs.h
@@ -44,16 +44,16 @@ public:
     void setValue(const std::string &key, bool value);
     void setValue(const std::string &key, int value);
 
-    const std::string &getString(const std::string &key);
-    float getFloat(const std::string &key);
-    bool getBoolean(const std::string &key);
-    int getInteger(const std::string &key);
+    const std::string &getString(const std::string &key) const;
+    float getFloat(const std::string &key) const;
+    bool getBoolean(const std::string &key) const;
+    int getInteger(const std::string &key) const;
 
 private:
     std::string m_fileName;
     std::map<std::string, std::string> m_confsMap;
 };
 
-extern Configs g_config;
+extern Configs g_configs;
 
 #endif // CONFIGS_H
diff --git a/src/framework/font.h b/src/framework/font.h
index 8cb26892..3d5c4f77 100644
--- a/src/framework/font.h
+++ b/src/framework/font.h
@@ -36,12 +36,10 @@ public:
     /// Load font from file
     bool load(const std::string &file);
 
-    std::string& getName() { return m_name; }
+    const std::string& getName() const { return m_name; }
 
 private:
     std::string m_name;
 };
 
-typedef std::shared_ptr<Font> FontPtr;
-
 #endif // FONT_H
diff --git a/src/framework/framebuffer.cpp b/src/framework/framebuffer.cpp
index 9cc17732..a846b553 100644
--- a/src/framework/framebuffer.cpp
+++ b/src/framework/framebuffer.cpp
@@ -62,7 +62,7 @@ FrameBuffer::FrameBuffer(int width, int height)
             oglDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)Platform::getExtensionProcAddress("glDeleteFramebuffers");
             oglCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)Platform::getExtensionProcAddress("glCheckFramebufferStatus");
         }
-        
+
         // generate FBO
         oglGenFramebuffers(1, &m_fbo);
         oglBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
diff --git a/src/framework/graphics.h b/src/framework/graphics.h
index fafa5f40..1030baed 100644
--- a/src/framework/graphics.h
+++ b/src/framework/graphics.h
@@ -40,6 +40,7 @@ public:
     void init();
     void terminate();
 
+    /// Check if a GL extension is supported
     bool isExtensionSupported(const char *extension);
 
     /// Called after every window resize
diff --git a/src/main.cpp b/src/main.cpp
index 65acfafe..769b77c2 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -53,22 +53,22 @@ void setDefaultConfigs()
     int defHeight = 480;
 
     // init on screen center
-    g_config.setValue("window x", (Platform::getDisplayWidth() - defWidth)/2);
-    g_config.setValue("window y", (Platform::getDisplayHeight() - defHeight)/2);
+    g_configs.setValue("window x", (Platform::getDisplayWidth() - defWidth)/2);
+    g_configs.setValue("window y", (Platform::getDisplayHeight() - defHeight)/2);
 
-    g_config.setValue("window width", defWidth);
-    g_config.setValue("window height", defHeight);
-    g_config.setValue("window maximized", false);
+    g_configs.setValue("window width", defWidth);
+    g_configs.setValue("window height", defHeight);
+    g_configs.setValue("window maximized", false);
 }
 
 void saveConfigs()
 {
-    g_config.setValue("window x", Platform::getWindowX());
-    g_config.setValue("window y", Platform::getWindowY());
-    g_config.setValue("window width", Platform::getWindowWidth());
-    g_config.setValue("window height", Platform::getWindowHeight());
-    g_config.setValue("window maximized", Platform::isWindowMaximized());
-    g_config.save();
+    g_configs.setValue("window x", Platform::getWindowX());
+    g_configs.setValue("window y", Platform::getWindowY());
+    g_configs.setValue("window width", Platform::getWindowWidth());
+    g_configs.setValue("window height", Platform::getWindowHeight());
+    g_configs.setValue("window maximized", Platform::isWindowMaximized());
+    g_configs.save();
 }
 
 int main(int argc, const char *argv[])
@@ -90,16 +90,16 @@ int main(int argc, const char *argv[])
     setDefaultConfigs();
 
     // load configurations
-    if(!g_config.load("config.yml"))
+    if(!g_configs.load("config.yml"))
         notice("Could not read configuration file, default configurations will be used.");
 
     notice("OTClient 0.1.0");
 
     // create the window
-    Platform::createWindow(g_config.getInteger("window x"), g_config.getInteger("window y"),
-                           g_config.getInteger("window width"), g_config.getInteger("window height"),
+    Platform::createWindow(g_configs.getInteger("window x"), g_configs.getInteger("window y"),
+                           g_configs.getInteger("window width"), g_configs.getInteger("window height"),
                            640, 480,
-                           g_config.getBoolean("window maximized"));
+                           g_configs.getBoolean("window maximized"));
     Platform::setWindowTitle("OTClient");
     Platform::setVsync();
 
@@ -108,7 +108,7 @@ int main(int argc, const char *argv[])
 
     // state scope
     {
-        std::shared_ptr<MenuState> menuState(new MenuState());
+        std::shared_ptr<MenuState> menuState(new MenuState);
         g_engine.changeState(menuState.get());
 
         Platform::showWindow();