builtin/settingtypes.txt

@@ -623,6 +623,9 @@ bloom_radius (Bloom Radius) float 1 0.1 8
 #    Requires the sound system to be enabled.
 sound_volume (Volume) float 0.8 0.0 1.0
 
+#    Volume multiplier when the window is unfocused.
+sound_volume_unfocused (Volume when unfocused) float 0.3 0.0 1.0
+
 #    Whether to mute sounds. You can unmute sounds at any time, unless the
 #    sound system is disabled (enable_sound=false).
 #    In-game, you can toggle the mute state with the mute key or by using the

src/client/client.cpp

@@ -393,8 +393,8 @@ void Client::connect(Address address, bool is_local_server)
 void Client::step(float dtime)
 {
 	// Limit a bit
-	if (dtime > 2.0)
+	if (dtime > DTIME_LIMIT)
-		dtime = 2.0;
+		dtime = DTIME_LIMIT;
 
 	m_animation_time += dtime;
 	if(m_animation_time > 60.0)

src/client/game.cpp

@@ -3209,19 +3209,7 @@ void Game::updateSound(f32 dtime)
 			camera->getDirection(),
 			camera->getCameraNode()->getUpVector());
 
-	bool mute_sound = g_settings->getBool("mute_sound");
+	sound_volume_control(sound_manager.get(), device->isWindowActive());
-	if (mute_sound) {
-		sound_manager->setListenerGain(0.0f);
-	} else {
-		// Check if volume is in the proper range, else fix it.
-		float old_volume = g_settings->getFloat("sound_volume");
-		float new_volume = rangelim(old_volume, 0.0f, 1.0f);
-		sound_manager->setListenerGain(new_volume);
-
-		if (old_volume != new_volume) {
-			g_settings->setFloat("sound_volume", new_volume);
-		}
-	}
 
 	// Tell the sound maker whether to make footstep sounds
 	soundmaker->makes_footstep_sound = player->makes_footstep_sound;
@@ -4124,6 +4112,7 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 			break;
 
 		if (formspec->getReferenceCount() == 1) {
+			// See GUIFormSpecMenu::create what refcnt = 1 means
 			m_game_ui->deleteFormspec();
 			break;
 		}

src/client/sound.cpp

@@ -22,6 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "filesys.h"
 #include "log.h"
 #include "porting.h"
+#include "settings.h"
 #include "util/numeric.h"
 #include <algorithm>
 #include <string>
@@ -95,3 +96,26 @@ void ISoundManager::freeId(sound_handle_t id, u32 num_owners)
 	else
 		it->second -= num_owners;
 }
+
+void sound_volume_control(ISoundManager *sound_mgr, bool is_window_active)
+{
+	bool mute_sound = g_settings->getBool("mute_sound");
+	if (mute_sound) {
+		sound_mgr->setListenerGain(0.0f);
+	} else {
+		// Check if volume is in the proper range, else fix it.
+		float old_volume = g_settings->getFloat("sound_volume");
+		float new_volume = rangelim(old_volume, 0.0f, 1.0f);
+
+		if (old_volume != new_volume) {
+			g_settings->setFloat("sound_volume", new_volume);
+		}
+
+		if (!is_window_active) {
+			new_volume *= g_settings->getFloat("sound_volume_unfocused");
+			new_volume = rangelim(new_volume, 0.0f, 1.0f);
+		}
+
+		sound_mgr->setListenerGain(new_volume);
+	}
+}

src/client/sound.h

@@ -184,3 +184,9 @@ public:
 	void fadeSound(sound_handle_t sound, f32 step, f32 target_gain) override {}
 	void updateSoundPosVel(sound_handle_t sound, const v3f &pos, const v3f &vel) override {}
 };
+
+/**
+ * A helper function to control sound volume based on some values: sound volume
+ * settings, mute sound setting, and window activity.
+ */
+void sound_volume_control(ISoundManager *sound_mgr, bool is_window_active);

src/collision.cpp

@@ -241,13 +241,13 @@ collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
 	/*
 		Calculate new velocity
 	*/
-	if (dtime > 0.5f) {
+	if (dtime > DTIME_LIMIT) {
 		if (!time_notification_done) {
 			time_notification_done = true;
-			infostream << "collisionMoveSimple: maximum step interval exceeded,"
+			warningstream << "collisionMoveSimple: maximum step interval exceeded,"
 					" lost movement details!"<<std::endl;
 		}
-		dtime = 0.5f;
+		dtime = DTIME_LIMIT;
 	} else {
 		time_notification_done = false;
 	}

src/constants.h

@@ -56,6 +56,13 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 // Override for the previous one when distance of block is very low
 #define BLOCK_SEND_DISABLE_LIMITS_MAX_D 1
 
+/*
+    Client/Server
+*/
+
+// Limit maximum dtime in client/server step(...) and for collision detection
+#define DTIME_LIMIT 2.5f
+
 /*
     Map-related things
 */

src/defaultsettings.cpp

@@ -40,6 +40,7 @@ void set_default_settings()
 	settings->setDefault("address", "");
 	settings->setDefault("enable_sound", "true");
 	settings->setDefault("sound_volume", "0.8");
+	settings->setDefault("sound_volume_unfocused", "0.3");
 	settings->setDefault("mute_sound", "false");
 	settings->setDefault("enable_mesh_cache", "false");
 	settings->setDefault("mesh_generation_interval", "0");

src/gui/guiEngine.cpp

@@ -23,7 +23,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <ICameraSceneNode.h>
 #include "client/renderingengine.h"
 #include "scripting_mainmenu.h"
-#include "util/numeric.h"
 #include "config.h"
 #include "version.h"
 #include "porting.h"
@@ -296,6 +295,7 @@ void GUIEngine::run()
 		driver->endScene();
 
 		IrrlichtDevice *device = m_rendering_engine->get_raw_device();
+
 		u32 frametime_min = 1000 / (device->isWindowFocused()
 			? g_settings->getFloat("fps_max")
 			: g_settings->getFloat("fps_max_unfocused"));
@@ -310,6 +310,8 @@ void GUIEngine::run()
 
 		m_script->step();
 
+		sound_volume_control(m_sound_manager.get(), device->isWindowActive());
+
 		m_sound_manager->step(dtime);
 
 #ifdef __ANDROID__

src/gui/guiFormSpecMenu.cpp

@@ -138,11 +138,23 @@ void GUIFormSpecMenu::create(GUIFormSpecMenu *&cur_formspec, Client *client,
 	gui::IGUIEnvironment *guienv, JoystickController *joystick, IFormSource *fs_src,
 	TextDest *txt_dest, const std::string &formspecPrepend, ISoundManager *sound_manager)
 {
+	if (cur_formspec && cur_formspec->getReferenceCount() == 1) {
+		/*
+			Why reference count == 1? Reason:
+			1 on creation (see "drop()" remark below)
+			+1 for being a guiroot child
+			+1 when focused (CGUIEnvironment::setFocus)
+
+			Hence re-create the formspec when it's existing without any parent.
+		*/
+		cur_formspec->drop();
+		cur_formspec = nullptr;
+	}
+
 	if (cur_formspec == nullptr) {
 		cur_formspec = new GUIFormSpecMenu(joystick, guiroot, -1, &g_menumgr,
 			client, guienv, client->getTextureSource(), sound_manager, fs_src,
 			txt_dest, formspecPrepend);
-		cur_formspec->doPause = false;
 
 		/*
 			Caution: do not call (*cur_formspec)->drop() here --
@@ -151,12 +163,13 @@ void GUIFormSpecMenu::create(GUIFormSpecMenu *&cur_formspec, Client *client,
 			remaining reference (i.e. the menu was removed)
 			and delete it in that case.
 		*/
-
 	} else {
 		cur_formspec->setFormspecPrepend(formspecPrepend);
 		cur_formspec->setFormSource(fs_src);
 		cur_formspec->setTextDest(txt_dest);
 	}
+
+	cur_formspec->doPause = false;
 }
 
 void GUIFormSpecMenu::removeTooltip()

src/server.cpp

@@ -577,8 +577,8 @@ void Server::stop()
 void Server::step(float dtime)
 {
 	// Limit a bit
-	if (dtime > 2.0)
+	if (dtime > DTIME_LIMIT)
-		dtime = 2.0;
+		dtime = DTIME_LIMIT;
 	{
 		MutexAutoLock lock(m_step_dtime_mutex);
 		m_step_dtime += dtime;