Add camera smoothing and cinematic mode (F8)

minetest.conf.example

@@ -48,6 +48,7 @@
 #keymap_rangeselect = KEY_KEY_R
 #keymap_freemove = KEY_KEY_K
 #keymap_fastmove = KEY_KEY_J
+#keymap_cinematic = KEY_F8
 #keymap_screenshot = KEY_F12
 #    If true, keymap_special1 instead of keymap_sneak is used for climbing down and descending
 #aux1_descends = false
@@ -127,6 +128,13 @@
 #free_move = false
 #    Continuous forward movement (for testing)
 #continuous_forward = false
+#    Enable cinematic mode
+#cinematic = false
+#    Camera smoothing - smooths rotation of camera. 0 is no smoothing.
+#    Must be equal to or greater than 0, and less than 1.
+#camera_smoothing = 0.0
+#    Camera smoothing when in cinematic mode
+#cinematic_camera_smoothing = 0.7
 #    Fast movement (keymap_special1)
 #fast_move = false
 #    Invert mouse

src/defaultsettings.cpp

@@ -48,6 +48,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("keymap_freemove", "KEY_KEY_K");
 	settings->setDefault("keymap_fastmove", "KEY_KEY_J");
 	settings->setDefault("keymap_noclip", "KEY_KEY_H");
+	settings->setDefault("keymap_cinematic", "KEY_F8");
 	settings->setDefault("keymap_screenshot", "KEY_F12");
 	settings->setDefault("keymap_toggle_hud", "KEY_F1");
 	settings->setDefault("keymap_toggle_chat", "KEY_F2");
@@ -115,6 +116,9 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("free_move", "false");
 	settings->setDefault("noclip", "false");
 	settings->setDefault("continuous_forward", "false");
+	settings->setDefault("cinematic", "false");
+	settings->setDefault("camera_smoothing", "0");
+	settings->setDefault("cinematic_camera_smoothing", "0.7");
 	settings->setDefault("fast_move", "false");
 	settings->setDefault("invert_mouse", "false");
 	settings->setDefault("enable_clouds", "true");

src/game.cpp

@@ -1253,6 +1253,7 @@ struct KeyCache {
 		KEYMAP_ID_FREEMOVE,
 		KEYMAP_ID_FASTMOVE,
 		KEYMAP_ID_NOCLIP,
+		KEYMAP_ID_CINEMATIC,
 		KEYMAP_ID_SCREENSHOT,
 		KEYMAP_ID_TOGGLE_HUD,
 		KEYMAP_ID_TOGGLE_CHAT,
@@ -1301,6 +1302,7 @@ void KeyCache::populate()
 	key[KEYMAP_ID_FREEMOVE]     = getKeySetting("keymap_freemove");
 	key[KEYMAP_ID_FASTMOVE]     = getKeySetting("keymap_fastmove");
 	key[KEYMAP_ID_NOCLIP]       = getKeySetting("keymap_noclip");
+	key[KEYMAP_ID_CINEMATIC]    = getKeySetting("keymap_cinematic");
 	key[KEYMAP_ID_SCREENSHOT]   = getKeySetting("keymap_screenshot");
 	key[KEYMAP_ID_TOGGLE_HUD]   = getKeySetting("keymap_toggle_hud");
 	key[KEYMAP_ID_TOGGLE_CHAT]  = getKeySetting("keymap_toggle_chat");
@@ -1497,6 +1499,7 @@ protected:
 	void toggleFreeMoveAlt(float *statustext_time, float *jump_timer);
 	void toggleFast(float *statustext_time);
 	void toggleNoClip(float *statustext_time);
+	void toggleCinematic(float *statustext_time);
 
 	void toggleChat(float *statustext_time, bool *flag);
 	void toggleHud(float *statustext_time, bool *flag);
@@ -1737,6 +1740,7 @@ void Game::run()
 {
 	ProfilerGraph graph;
 	RunStats stats              = { 0 };
+	CameraOrientation cam_view_target  = { 0 };
 	CameraOrientation cam_view  = { 0 };
 	GameRunData runData         = { 0 };
 	FpsControl draw_times       = { 0 };
@@ -1792,7 +1796,17 @@ void Game::run()
 		updateProfilers(runData, stats, draw_times, dtime);
 		processUserInput(&flags, &runData, dtime);
 		// Update camera before player movement to avoid camera lag of one frame
-		updateCameraDirection(&cam_view, &flags);
+		updateCameraDirection(&cam_view_target, &flags);
+		float cam_smoothing = 0;
+		if (g_settings->getBool("cinematic"))
+			cam_smoothing = 1 - g_settings->getFloat("cinematic_camera_smoothing");
+		else
+			cam_smoothing = 1 - g_settings->getFloat("camera_smoothing");
+		cam_smoothing = rangelim(cam_smoothing, 0.01f, 1.0f);
+		cam_view.camera_yaw += (cam_view_target.camera_yaw -
+				cam_view.camera_yaw) * cam_smoothing;
+		cam_view.camera_pitch += (cam_view_target.camera_pitch -
+				cam_view.camera_pitch) * cam_smoothing;
 		updatePlayerControl(cam_view);
 		step(&dtime);
 		processClientEvents(&cam_view, &runData.damage_flash);
@@ -2568,6 +2582,8 @@ void Game::processKeyboardInput(VolatileRunFlags *flags,
 		toggleFast(statustext_time);
 	} else if (input->wasKeyDown(keycache.key[KeyCache::KEYMAP_ID_NOCLIP])) {
 		toggleNoClip(statustext_time);
+	} else if (input->wasKeyDown(keycache.key[KeyCache::KEYMAP_ID_CINEMATIC])) {
+		toggleCinematic(statustext_time);
 	} else if (input->wasKeyDown(keycache.key[KeyCache::KEYMAP_ID_SCREENSHOT])) {
 		client->makeScreenshot(device);
 	} else if (input->wasKeyDown(keycache.key[KeyCache::KEYMAP_ID_TOGGLE_HUD])) {
@@ -2754,6 +2770,16 @@ void Game::toggleNoClip(float *statustext_time)
 		statustext += L" (note: no 'noclip' privilege)";
 }
 
+void Game::toggleCinematic(float *statustext_time)
+{
+	static const wchar_t *msg[] = { L"cinematic disabled", L"cinematic enabled" };
+	bool cinematic = !g_settings->getBool("cinematic");
+	g_settings->set("cinematic", bool_to_cstr(cinematic));
+
+	*statustext_time = 0;
+	statustext = msg[cinematic];
+}
+
 
 void Game::toggleChat(float *statustext_time, bool *flag)
 {
@@ -4237,4 +4263,3 @@ void the_game(bool *kill,
 		error_message = narrow_to_wide(e.what()) + wstrgettext("\nCheck debug.txt for details.");
 	}
 }
-

src/guiKeyChangeMenu.cpp

@@ -51,6 +51,7 @@ enum
 	GUI_ID_KEY_FAST_BUTTON,
 	GUI_ID_KEY_JUMP_BUTTON,
 	GUI_ID_KEY_NOCLIP_BUTTON,
+	GUI_ID_KEY_CINEMATIC_BUTTON,
 	GUI_ID_KEY_CHAT_BUTTON,
 	GUI_ID_KEY_CMD_BUTTON,
 	GUI_ID_KEY_CONSOLE_BUTTON,
@@ -137,20 +138,20 @@ void GUIKeyChangeMenu::regenerateGui(v2u32 screensize)
 	{
 		key_setting *k = key_settings.at(i);
 		{
-			core::rect < s32 > rect(0, 0, 100, 20);
+			core::rect < s32 > rect(0, 0, 110, 20);
 			rect += topleft + v2s32(offset.X, offset.Y);
 			Environment->addStaticText(k->button_name, rect, false, true, this, -1);
 		}
 
 		{
 			core::rect < s32 > rect(0, 0, 100, 30);
-			rect += topleft + v2s32(offset.X + 105, offset.Y - 5);
+			rect += topleft + v2s32(offset.X + 115, offset.Y - 5);
 			const wchar_t *text = wgettext(k->key.name());
 			k->button = Environment->addButton(rect, this, k->id, text);
 			delete[] text;
 		}
 		if(i + 1 == KMaxButtonPerColumns)
-			offset = v2s32(250, 60);
+			offset = v2s32(260, 60);
 		else
 			offset += v2s32(0, 25);
 	}
@@ -408,6 +409,7 @@ void GUIKeyChangeMenu::init_keys()
 	this->add_key(GUI_ID_KEY_CONSOLE_BUTTON,   wgettext("Console"),          "keymap_console");
 	this->add_key(GUI_ID_KEY_FLY_BUTTON,       wgettext("Toggle fly"),       "keymap_freemove");
 	this->add_key(GUI_ID_KEY_FAST_BUTTON,      wgettext("Toggle fast"),      "keymap_fastmove");
+	this->add_key(GUI_ID_KEY_CINEMATIC_BUTTON, wgettext("Toggle Cinematic"), "keymap_cinematic");
 	this->add_key(GUI_ID_KEY_NOCLIP_BUTTON,    wgettext("Toggle noclip"),    "keymap_noclip");
 	this->add_key(GUI_ID_KEY_RANGE_BUTTON,     wgettext("Range select"),     "keymap_rangeselect");
 	this->add_key(GUI_ID_KEY_DUMP_BUTTON,      wgettext("Print stacks"),     "keymap_print_debug_stacks");