Stop render when iconified

src/engine.cpp

@@ -109,10 +109,16 @@ void Engine::mainloop() {
 
 		gui->act(delta);
 		screen->update(delta);
-		screen->draw(delta);
-		gui->draw(&batch, assets.get());
 
-		Window::swapInterval(settings.display.swapInterval);
+        if (!Window::isIconified()) {
+		    screen->draw(delta);
+		    gui->draw(&batch, assets.get());
+		    Window::swapInterval(settings.display.swapInterval);
+        } else {
+            Window::swapInterval(1);
+		    Window::swapBuffers();
+        }
+
 		Window::swapBuffers();
 		Events::pollEvents();
 	}

src/window/Window.cpp

@@ -50,6 +50,10 @@ bool Window::isMaximized() {
 	return glfwGetWindowAttrib(window, GLFW_MAXIMIZED);
 }
 
+bool Window::isIconified() {
+    return glfwGetWindowAttrib(window, GLFW_ICONIFIED);
+}
+
 bool Window::isFocused()
 {
 	return glfwGetWindowAttrib(window, GLFW_FOCUSED);

src/window/Window.h

@@ -39,6 +39,7 @@ public:
 	static bool isFullscreen();
 	static bool isMaximized();
 	static bool isFocused();
+    static bool isIconified();
 
 	static void pushScissor(glm::vec4 area);
 	static void popScissor();