GameUI refactor (part 1/X): GameUI object creation + GameUIFlags move to GameUI

Game class is too huge and has too specialization on various subjects, like UI, formspecs, client, renderer. Start to move UI related things to GameUI object and cleanup them

Other improvements:
* updateChat: more performance on error messages by remove string copies
* Initialize all game class members in definition instead of constructor (with nullptr instead of NULL)
* Drop unused Client::show{GameChat,GameHud,Profiler,GameFog}
* Add GameUI unittests

9 files changed, 229 insertions, 131 deletions

diff --git a/src/client.cpp b/src/client.cpp
index 6e29607ca..e6af5c324 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -28,6 +28,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "network/networkpacket.h"
 #include "threading/mutex_auto_lock.h"
 #include "client/clientevent.h"
+#include "client/gameui.h"
 #include "client/renderingengine.h"
 #include "client/tile.h"
 #include "util/auth.h"
@@ -74,7 +75,7 @@ Client::Client(
 		ISoundManager *sound,
 		MtEventManager *event,
 		bool ipv6,
-		GameUIFlags *game_ui_flags
+		GameUI *game_ui
 ):
 	m_tsrc(tsrc),
 	m_shsrc(shsrc),
@@ -96,7 +97,7 @@ Client::Client(
 	m_chosen_auth_mech(AUTH_MECHANISM_NONE),
 	m_media_downloader(new ClientMediaDownloader()),
 	m_state(LC_Created),
-	m_game_ui_flags(game_ui_flags),
+	m_game_ui(game_ui),
 	m_modchannel_mgr(new ModChannelMgr())
 {
 	// Add local player
@@ -1771,34 +1772,9 @@ void Client::pushToEventQueue(ClientEvent *event)
 	m_client_event_queue.push(event);
 }
 
-void Client::showGameChat(const bool show)
-{
-	m_game_ui_flags->show_chat = show;
-}
-
-void Client::showGameHud(const bool show)
-{
-	m_game_ui_flags->show_hud = show;
-}
-
 void Client::showMinimap(const bool show)
 {
-	m_game_ui_flags->show_minimap = show;
-}
-
-void Client::showProfiler(const bool show)
-{
-	m_game_ui_flags->show_profiler_graph = show;
-}
-
-void Client::showGameFog(const bool show)
-{
-	m_game_ui_flags->force_fog_off = !show;
-}
-
-void Client::showGameDebug(const bool show)
-{
-	m_game_ui_flags->show_debug = show;
+	m_game_ui->showMinimap(show);
 }
 
 // IGameDef interface
diff --git a/src/client.h b/src/client.h
index 6093d6a6f..f5929e055 100644
--- a/src/client.h
+++ b/src/client.h
@@ -112,7 +112,7 @@ private:
 };
 
 class ClientScripting;
-struct GameUIFlags;
+class GameUI;
 
 class Client : public con::PeerHandler, public InventoryManager, public IGameDef
 {
@@ -133,7 +133,7 @@ public:
 			ISoundManager *sound,
 			MtEventManager *event,
 			bool ipv6,
-			GameUIFlags *game_ui_flags
+			GameUI *game_ui
 	);
 
 	~Client();
@@ -400,12 +400,7 @@ public:
 
 	void pushToEventQueue(ClientEvent *event);
 
-	void showGameChat(bool show = true);
-	void showGameHud(bool show = true);
 	void showMinimap(bool show = true);
-	void showProfiler(bool show = true);
-	void showGameFog(bool show = true);
-	void showGameDebug(bool show = true);
 
 	const Address getServerAddress();
 
@@ -570,6 +565,8 @@ private:
 	// own state
 	LocalClientState m_state;
 
+	GameUI *m_game_ui;
+
 	// Used for saving server map to disk client-side
 	MapDatabase *m_localdb = nullptr;
 	IntervalLimiter m_localdb_save_interval;
@@ -580,7 +577,6 @@ private:
 	std::unordered_map<std::string, ModMetadata *> m_mod_storages;
 	float m_mod_storage_save_timer = 10.0f;
 	std::vector<ModSpec> m_mods;
-	GameUIFlags *m_game_ui_flags;
 
 	bool m_shutdown = false;
 
diff --git a/src/client/CMakeLists.txt b/src/client/CMakeLists.txt
index 3cc6c0351..3462636f4 100644
--- a/src/client/CMakeLists.txt
+++ b/src/client/CMakeLists.txt
@@ -9,6 +9,7 @@ set(client_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/render/stereo.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/renderingengine.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/clientlauncher.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/gameui.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/inputhandler.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/tile.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/joystick_controller.cpp
diff --git a/src/client/gameui.cpp b/src/client/gameui.cpp
new file mode 100644
index 000000000..7307daf75
--- /dev/null
+++ b/src/client/gameui.cpp
@@ -0,0 +1,35 @@
+/*
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2018 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "gameui.h"
+#include "settings.h"
+
+void GameUI::initFlags()
+{
+	memset(&m_flags, 0, sizeof(GameUI::Flags));
+	m_flags.show_chat = true;
+	m_flags.show_hud = true;
+	m_flags.show_debug = g_settings->getBool("show_debug");
+}
+
+void GameUI::showMinimap(const bool show)
+{
+	m_flags.show_minimap = show;
+}
diff --git a/src/client/gameui.h b/src/client/gameui.h
new file mode 100644
index 000000000..bd9c0f626
--- /dev/null
+++ b/src/client/gameui.h
@@ -0,0 +1,60 @@
+/*
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2018 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#include "IGUIEnvironment.h"
+
+using namespace irr;
+
+class GameUI
+{
+	// Temporary between coding time to move things here
+	friend class Game;
+
+public:
+	// Flags that can, or may, change during main game loop
+	struct Flags
+	{
+		bool show_chat;
+		bool show_hud;
+		bool show_minimap;
+		bool force_fog_off;
+		bool show_debug;
+		bool show_profiler_graph;
+		bool disable_camera_update;
+	};
+
+	void initFlags();
+	const Flags &getFlags() const { return m_flags; }
+
+	void showMinimap(const bool show);
+
+private:
+	Flags m_flags;
+
+	// @TODO future move
+	//	gui::IGUIStaticText *m_guitext;          // First line of debug text
+	//	gui::IGUIStaticText *m_guitext2;         // Second line of debug text
+	//	gui::IGUIStaticText *m_guitext_info;     // At the middle of the screen
+	//	gui::IGUIStaticText *m_guitext_status;
+	//	gui::IGUIStaticText *m_guitext_chat;	 // Chat text
+	//	gui::IGUIStaticText *m_guitext_profiler; // Profiler text
+};
diff --git a/src/game.cpp b/src/game.cpp
index ac50e9aba..f1ee9f8e2 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "camera.h"
 #include "client.h"
 #include "client/clientevent.h"
+#include "client/gameui.h"
 #include "client/inputhandler.h"
 #include "client/tile.h"     // For TextureSource
 #include "client/keys.h"
@@ -965,7 +966,8 @@ static void updateChat(Client &client, f32 dtime, bool show_debug,
 	while (!chat_log_error_buf.empty()) {
 		std::wstring error_message = utf8_to_wide(chat_log_error_buf.get());
 		if (!g_settings->getBool("disable_escape_sequences")) {
-			error_message = L"\x1b(c@red)" + error_message + L"\x1b(c@white)";
+			error_message = L"\x1b(c@red)";
+			error_message.append(error_message).append(L"\x1b(c@white)");
 		}
 		chat_backend.addMessage(L"", error_message);
 	}
@@ -1392,41 +1394,41 @@ private:
 
 	InputHandler *input;
 
-	Client *client;
-	Server *server;
+	Client *client = nullptr;
+	Server *server = nullptr;
 
-	IWritableTextureSource *texture_src;
-	IWritableShaderSource *shader_src;
+	IWritableTextureSource *texture_src = nullptr;
+	IWritableShaderSource *shader_src = nullptr;
 
 	// When created, these will be filled with data received from the server
-	IWritableItemDefManager *itemdef_manager;
-	IWritableNodeDefManager *nodedef_manager;
+	IWritableItemDefManager *itemdef_manager = nullptr;
+	IWritableNodeDefManager *nodedef_manager = nullptr;
 
 	GameOnDemandSoundFetcher soundfetcher; // useful when testing
-	ISoundManager *sound;
+	ISoundManager *sound = nullptr;
 	bool sound_is_dummy = false;
-	SoundMaker *soundmaker;
+	SoundMaker *soundmaker = nullptr;
 
-	ChatBackend *chat_backend;
+	ChatBackend *chat_backend = nullptr;
 
-	GUIFormSpecMenu *current_formspec;
+	GUIFormSpecMenu *current_formspec = nullptr;
 	//default: "". If other than "", empty show_formspec packets will only close the formspec when the formname matches
 	std::string cur_formname;
 
-	EventManager *eventmgr;
-	QuicktuneShortcutter *quicktune;
+	EventManager *eventmgr = nullptr;
+	QuicktuneShortcutter *quicktune = nullptr;
 
-	GUIChatConsole *gui_chat_console; // Free using ->Drop()
-	MapDrawControl *draw_control;
-	Camera *camera;
-	Clouds *clouds;	                  // Free using ->Drop()
-	Sky *sky;                         // Free using ->Drop()
-	Inventory *local_inventory;
-	Hud *hud;
-	Minimap *mapper;
+	std::unique_ptr<GameUI> m_game_ui;
+	GUIChatConsole *gui_chat_console = nullptr; // Free using ->Drop()
+	MapDrawControl *draw_control = nullptr;
+	Camera *camera = nullptr;
+	Clouds *clouds = nullptr;	                  // Free using ->Drop()
+	Sky *sky = nullptr;                         // Free using ->Drop()
+	Inventory *local_inventory = nullptr;
+	Hud *hud = nullptr;
+	Minimap *mapper = nullptr;
 
 	GameRunData runData;
-	GameUIFlags flags;
 
 	/* 'cache'
 	   This class does take ownership/responsibily for cleaning up etc of any of
@@ -1496,27 +1498,7 @@ private:
 };
 
 Game::Game() :
-	client(NULL),
-	server(NULL),
-	texture_src(NULL),
-	shader_src(NULL),
-	itemdef_manager(NULL),
-	nodedef_manager(NULL),
-	sound(NULL),
-	soundmaker(NULL),
-	chat_backend(NULL),
-	current_formspec(NULL),
-	cur_formname(""),
-	eventmgr(NULL),
-	quicktune(NULL),
-	gui_chat_console(NULL),
-	draw_control(NULL),
-	camera(NULL),
-	clouds(NULL),
-	sky(NULL),
-	local_inventory(NULL),
-	hud(NULL),
-	mapper(NULL)
+	m_game_ui(new GameUI())
 {
 	g_settings->registerChangedCallback("doubletap_jump",
 		&settingChangedCallback, this);
@@ -1643,10 +1625,8 @@ bool Game::startup(bool *kill,
 	runData.profiler_max_page = 3;
 	runData.update_wielded_item_trigger = true;
 
-	memset(&flags, 0, sizeof(flags));
-	flags.show_chat = true;
-	flags.show_hud = true;
-	flags.show_debug = g_settings->getBool("show_debug");
+	m_game_ui->initFlags();
+
 	m_invert_mouse = g_settings->getBool("invert_mouse");
 	m_first_loop_after_window_activation = true;
 
@@ -1737,12 +1717,13 @@ void Game::run()
 		processClientEvents(&cam_view_target);
 		updateCamera(draw_times.busy_time, dtime);
 		updateSound(dtime);
-		processPlayerInteraction(dtime, flags.show_hud, flags.show_debug);
+		processPlayerInteraction(dtime, m_game_ui->m_flags.show_hud,
+			m_game_ui->m_flags.show_debug);
 		updateFrame(&graph, &stats, dtime, cam_view);
 		updateProfilerGraphs(&graph);
 
 		// Update if minimap has been disabled by the server
-		flags.show_minimap &= client->shouldShowMinimap();
+		m_game_ui->m_flags.show_minimap &= client->shouldShowMinimap();
 
 		if (m_does_lost_focus_pause_game && !device->isWindowFocused() && !isMenuActive()) {
 			showPauseMenu();
@@ -1935,7 +1916,7 @@ bool Game::createClient(const std::string &playername,
 	}
 
 	GameGlobalShaderConstantSetterFactory *scsf = new GameGlobalShaderConstantSetterFactory(
-			&flags.force_fog_off, &runData.fog_range, client);
+			&m_game_ui->m_flags.force_fog_off, &runData.fog_range, client);
 	shader_src->addShaderConstantSetterFactory(scsf);
 
 	// Update cached textures, meshes and materials
@@ -2128,7 +2109,7 @@ bool Game::connectToServer(const std::string &playername,
 	client = new Client(playername.c_str(), password, *address,
 			*draw_control, texture_src, shader_src,
 			itemdef_manager, nodedef_manager, sound, eventmgr,
-			connect_address.isIPv6(), &flags);
+			connect_address.isIPv6(), m_game_ui.get());
 
 	if (!client)
 		return false;
@@ -2816,9 +2797,9 @@ void Game::toggleAutoforward()
 
 void Game::toggleChat()
 {
-	flags.show_chat = !flags.show_chat;
+	m_game_ui->m_flags.show_chat = !m_game_ui->m_flags.show_chat;
 	runData.statustext_time = 0;
-	if (flags.show_chat)
+	if (m_game_ui->m_flags.show_chat)
 		showStatusTextSimple("Chat shown");
 	else
 		showStatusTextSimple("Chat hidden");
@@ -2827,9 +2808,9 @@ void Game::toggleChat()
 
 void Game::toggleHud()
 {
-	flags.show_hud = !flags.show_hud;
+	m_game_ui->m_flags.show_hud = !m_game_ui->m_flags.show_hud;
 	runData.statustext_time = 0;
-	if (flags.show_hud)
+	if (m_game_ui->m_flags.show_hud)
 		showStatusTextSimple("HUD shown");
 	else
 		showStatusTextSimple("HUD hidden");
@@ -2837,7 +2818,7 @@ void Game::toggleHud()
 
 void Game::toggleMinimap(bool shift_pressed)
 {
-	if (!mapper || !flags.show_hud || !g_settings->getBool("enable_minimap"))
+	if (!mapper || !m_game_ui->m_flags.show_hud || !g_settings->getBool("enable_minimap"))
 		return;
 
 	if (shift_pressed) {
@@ -2856,7 +2837,7 @@ void Game::toggleMinimap(bool shift_pressed)
 			mode = MINIMAP_MODE_OFF;
 	}
 
-	flags.show_minimap = true;
+	m_game_ui->m_flags.show_minimap = true;
 	switch (mode) {
 		case MINIMAP_MODE_SURFACEx1:
 			showStatusTextSimple("Minimap in surface mode, Zoom x1");
@@ -2878,7 +2859,7 @@ void Game::toggleMinimap(bool shift_pressed)
 			break;
 		default:
 			mode = MINIMAP_MODE_OFF;
-			flags.show_minimap = false;
+			m_game_ui->m_flags.show_minimap = false;
 			if (hud_flags & HUD_FLAG_MINIMAP_VISIBLE)
 				showStatusTextSimple("Minimap hidden");
 			else
@@ -2891,9 +2872,9 @@ void Game::toggleMinimap(bool shift_pressed)
 
 void Game::toggleFog()
 {
-	flags.force_fog_off = !flags.force_fog_off;
+	m_game_ui->m_flags.force_fog_off = !m_game_ui->m_flags.force_fog_off;
 	runData.statustext_time = 0;
-        if (flags.force_fog_off)
+        if (m_game_ui->m_flags.force_fog_off)
                 showStatusTextSimple("Fog disabled");
         else
                 showStatusTextSimple("Fog enabled");
@@ -2906,21 +2887,21 @@ void Game::toggleDebug()
 	// 1x toggle: Debug text with chat
 	// 2x toggle: Debug text with profiler graph
 	// 3x toggle: Debug text and wireframe
-	if (!flags.show_debug) {
-		flags.show_debug = true;
-		flags.show_profiler_graph = false;
+	if (!m_game_ui->m_flags.show_debug) {
+		m_game_ui->m_flags.show_debug = true;
+		m_game_ui->m_flags.show_profiler_graph = false;
 		draw_control->show_wireframe = false;
 		showStatusTextSimple("Debug info shown");
-	} else if (!flags.show_profiler_graph && !draw_control->show_wireframe) {
-		flags.show_profiler_graph = true;
+	} else if (!m_game_ui->m_flags.show_profiler_graph && !draw_control->show_wireframe) {
+		m_game_ui->m_flags.show_profiler_graph = true;
 		showStatusTextSimple("Profiler graph shown");
 	} else if (!draw_control->show_wireframe && client->checkPrivilege("debug")) {
-		flags.show_profiler_graph = false;
+		m_game_ui->m_flags.show_profiler_graph = false;
 		draw_control->show_wireframe = true;
 		showStatusTextSimple("Wireframe shown");
 	} else {
-		flags.show_debug = false;
-		flags.show_profiler_graph = false;
+		m_game_ui->m_flags.show_debug = false;
+		m_game_ui->m_flags.show_profiler_graph = false;
 		draw_control->show_wireframe = false;
 		if (client->checkPrivilege("debug")) {
 			showStatusTextSimple("Debug info, profiler graph, and wireframe hidden");
@@ -2934,9 +2915,9 @@ void Game::toggleDebug()
 
 void Game::toggleUpdateCamera()
 {
-	flags.disable_camera_update = !flags.disable_camera_update;
+	m_game_ui->m_flags.disable_camera_update = !m_game_ui->m_flags.disable_camera_update;
 	runData.statustext_time = 0;
-	if (flags.disable_camera_update)
+	if (m_game_ui->m_flags.disable_camera_update)
 		showStatusTextSimple("Camera update disabled");
 	else
 		showStatusTextSimple("Camera update enabled");
@@ -3529,7 +3510,7 @@ void Game::updateCamera(u32 busy_time, f32 dtime)
 
 	m_camera_offset_changed = (camera_offset != old_camera_offset);
 
-	if (!flags.disable_camera_update) {
+	if (!m_game_ui->m_flags.disable_camera_update) {
 		client->getEnv().getClientMap().updateCamera(camera_position,
 				camera_direction, camera_fov, camera_offset);
 
@@ -4224,7 +4205,7 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 			clouds->update(camera_node_position,
 					sky->getCloudColor());
 			if (clouds->isCameraInsideCloud() && m_cache_enable_fog &&
-					!flags.force_fog_off) {
+					!m_game_ui->m_flags.force_fog_off) {
 				// if inside clouds, and fog enabled, use that as sky
 				// color(s)
 				video::SColor clouds_dark = clouds->getColor()
@@ -4249,7 +4230,7 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 		Fog
 	*/
 
-	if (m_cache_enable_fog && !flags.force_fog_off) {
+	if (m_cache_enable_fog && !m_game_ui->m_flags.force_fog_off) {
 		driver->setFog(
 				sky->getBgColor(),
 				video::EFT_FOG_LINEAR,
@@ -4277,8 +4258,8 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 
 	v2u32 screensize = driver->getScreenSize();
 
-	updateChat(*client, dtime, flags.show_debug, screensize,
-			flags.show_chat, runData.profiler_current_page,
+	updateChat(*client, dtime, m_game_ui->m_flags.show_debug, screensize,
+		m_game_ui->m_flags.show_chat, runData.profiler_current_page,
 			*chat_backend, guitext_chat);
 
 	/*
@@ -4351,7 +4332,7 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 	TimeTaker tt_draw("mainloop: draw");
 	driver->beginScene(true, true, skycolor);
 
-	bool draw_wield_tool = (flags.show_hud &&
+	bool draw_wield_tool = (m_game_ui->m_flags.show_hud &&
 			(player->hud_flags & HUD_FLAG_WIELDITEM_VISIBLE) &&
 			(camera->getCameraMode() == CAMERA_MODE_FIRST));
 	bool draw_crosshair = (
@@ -4363,13 +4344,13 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 	} catch (SettingNotFoundException) {
 	}
 #endif
-	RenderingEngine::draw_scene(skycolor, flags.show_hud, flags.show_minimap,
-			draw_wield_tool, draw_crosshair);
+	RenderingEngine::draw_scene(skycolor, m_game_ui->m_flags.show_hud,
+			m_game_ui->m_flags.show_minimap, draw_wield_tool, draw_crosshair);
 
 	/*
 		Profiler graph
 	*/
-	if (flags.show_profiler_graph)
+	if (m_game_ui->m_flags.show_profiler_graph)
 		graph->draw(10, screensize.Y - 10, driver, g_fontengine->getFont());
 
 	/*
@@ -4397,7 +4378,7 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 	/*
 		Update minimap pos and rotation
 	*/
-	if (mapper && flags.show_minimap && flags.show_hud) {
+	if (mapper && m_game_ui->m_flags.show_minimap && m_game_ui->m_flags.show_hud) {
 		mapper->setPos(floatToInt(player->getPosition(), BS));
 		mapper->setAngle(player->getYaw());
 	}
@@ -4429,7 +4410,7 @@ void Game::updateGui(const RunStats &stats, f32 dtime, const CameraOrientation &
 	LocalPlayer *player = client->getEnv().getLocalPlayer();
 	v3f player_position = player->getPosition();
 
-	if (flags.show_debug) {
+	if (m_game_ui->m_flags.show_debug) {
 		static float drawtime_avg = 0;
 		drawtime_avg = drawtime_avg * 0.95 + stats.drawtime * 0.05;
 		u16 fps = 1.0 / stats.dtime_jitter.avg;
@@ -4462,7 +4443,7 @@ void Game::updateGui(const RunStats &stats, f32 dtime, const CameraOrientation &
 		guitext->setRelativePosition(rect);
 	}
 
-	if (flags.show_debug) {
+	if (m_game_ui->m_flags.show_debug) {
 		std::ostringstream os(std::ios_base::binary);
 		os << std::setprecision(1) << std::fixed
 			<< "pos: (" << (player_position.X / BS)
@@ -4498,7 +4479,7 @@ void Game::updateGui(const RunStats &stats, f32 dtime, const CameraOrientation &
 	}
 
 	setStaticText(guitext_info, translate_string(infotext).c_str());
-	guitext_info->setVisible(flags.show_hud && g_menumgr.menuCount() == 0);
+	guitext_info->setVisible(m_game_ui->m_flags.show_hud && g_menumgr.menuCount() == 0);
 
 	float statustext_time_max = 1.5;
 
diff --git a/src/game.h b/src/game.h
index 22a8d6f9b..223278006 100644
--- a/src/game.h
+++ b/src/game.h
@@ -26,18 +26,6 @@ class InputHandler;
 class ChatBackend;  /* to avoid having to include chat.h */
 struct SubgameSpec;
 
-// Flags that can, or may, change during main game loop
-struct GameUIFlags
-{
-	bool show_chat;
-	bool show_hud;
-	bool show_minimap;
-	bool force_fog_off;
-	bool show_debug;
-	bool show_profiler_graph;
-	bool disable_camera_update;
-};
-
 void the_game(bool *kill,
 		bool random_input,
 		InputHandler *input,
diff --git a/src/unittest/CMakeLists.txt b/src/unittest/CMakeLists.txt
index f56560666..56132d9c3 100644
--- a/src/unittest/CMakeLists.txt
+++ b/src/unittest/CMakeLists.txt
@@ -29,5 +29,6 @@ set (UNITTEST_SRCS
 	PARENT_SCOPE)
 
 set (UNITTEST_CLIENT_SRCS
+	${CMAKE_CURRENT_SOURCE_DIR}/test_gameui.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_keycode.cpp
 	PARENT_SCOPE)
diff --git a/src/unittest/test_gameui.cpp b/src/unittest/test_gameui.cpp
new file mode 100644
index 000000000..56f44ed87
--- /dev/null
+++ b/src/unittest/test_gameui.cpp
@@ -0,0 +1,60 @@
+/*
+Minetest
+Copyright (C) 2018 nerzhul, Loic BLOT <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "test.h"
+
+#include "client/gameui.h"
+
+class TestGameUI : public TestBase
+{
+public:
+	TestGameUI() { TestManager::registerTestModule(this); }
+	const char *getName() { return "TestGameUI"; }
+
+	void runTests(IGameDef *gamedef);
+
+	void testInit();
+	void testFlagSetters();
+};
+
+static TestGameUI g_test_instance;
+
+void TestGameUI::runTests(IGameDef *gamedef)
+{
+	TEST(testInit);
+	TEST(testFlagSetters);
+}
+
+void TestGameUI::testInit()
+{
+	GameUI gui{};
+	gui.initFlags();
+	UASSERT(gui.getFlags().show_chat)
+	UASSERT(gui.getFlags().show_hud)
+}
+
+void TestGameUI::testFlagSetters()
+{
+	GameUI gui;
+	gui.showMinimap(true);
+	UASSERT(gui.getFlags().show_minimap);
+
+	gui.showMinimap(false);
+	UASSERT(!gui.getFlags().show_minimap);
+}