Add zoom, tweakable with zoom_fov, default key: Z (like optifine)

minetest.conf.example

@@ -40,6 +40,7 @@
 #keymap_jump = KEY_SPACE
 #keymap_sneak = KEY_LSHIFT
 #keymap_inventory = KEY_KEY_I
+#keymap_zoom = KEY_KEY_Z
 # Go down ladder / go down in fly mode / go fast in fast mode
 #keymap_special1 = KEY_KEY_E
 #keymap_chat = KEY_KEY_T
@@ -55,6 +56,8 @@
 #doubletap_jump = false
 # If false aux1 is used to fly fast
 #always_fly_fast = true
+# FOV when using zoom, default 15
+#zoom_fov=15
 # Some (temporary) keys for debugging
 #keymap_print_debug_stacks = KEY_KEY_P
 #keymap_quicktune_prev = KEY_HOME

src/camera.cpp

@@ -301,10 +301,15 @@ void Camera::update(LocalPlayer* player, f32 frametime, v2u32 screensize,
 	// *100.0 helps in large map coordinates
 	m_cameranode->setTarget(m_camera_position + 100 * m_camera_direction);
 
-	// Get FOV setting
+	// Get FOV
-	f32 fov_degrees = g_settings->getFloat("fov");
+	f32 fov_degrees;
-	fov_degrees = MYMAX(fov_degrees, 10.0);
+	if (player->zoom) {
-	fov_degrees = MYMIN(fov_degrees, 170.0);
+		fov_degrees = g_settings->getFloat("zoom_fov");
+	} else {
+		fov_degrees = g_settings->getFloat("fov");
+		fov_degrees = MYMAX(fov_degrees, 10.0);
+		fov_degrees = MYMIN(fov_degrees, 170.0);
+	}
 
 	// FOV and aspect ratio
 	m_aspect = (f32)screensize.X / (f32) screensize.Y;

src/defaultsettings.cpp

@@ -36,6 +36,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("keymap_jump", "KEY_SPACE");
 	settings->setDefault("keymap_sneak", "KEY_LSHIFT");
 	settings->setDefault("keymap_drop", "KEY_KEY_Q");
+	settings->setDefault("keymap_zoom", "KEY_KEY_Z");
 	settings->setDefault("keymap_inventory", "KEY_KEY_I");
 	settings->setDefault("keymap_special1", "KEY_KEY_E");
 	settings->setDefault("keymap_chat", "KEY_KEY_T");
@@ -59,6 +60,7 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("aux1_descends", "false");
 	settings->setDefault("doubletap_jump", "false");
 	settings->setDefault("always_fly_fast", "true");
+	settings->setDefault("zoom_fov", "15");
 
 	// Some (temporary) keys for debugging
 	settings->setDefault("keymap_print_debug_stacks", "KEY_KEY_P");

src/game.cpp

@@ -1886,7 +1886,14 @@ void the_game(
 					+ itos(range_new));
 			statustext_time = 0;
 		}
-		
+
+
+		if (input->isKeyDown(getKeySetting("keymap_zoom"))) {
+			player->zoom=true;
+		} else {
+			player->zoom=false;
+		}
+
 		// Reset jump_timer
 		if(!input->isKeyDown(getKeySetting("keymap_jump")) && reset_jump_timer)
 		{

src/guiKeyChangeMenu.cpp

@@ -55,6 +55,7 @@ enum
 	GUI_ID_KEY_INVENTORY_BUTTON,
 	GUI_ID_KEY_DUMP_BUTTON,
 	GUI_ID_KEY_RANGE_BUTTON,
+	GUI_ID_KEY_ZOOM_BUTTON,
 	// other
 	GUI_ID_CB_AUX1_DESCENDS,
 	GUI_ID_CB_DOUBLETAP_JUMP,
@@ -377,6 +378,7 @@ void GUIKeyChangeMenu::init_keys()
 	this->add_key(GUI_ID_KEY_JUMP_BUTTON, gettext("Jump"), "keymap_jump");
 	this->add_key(GUI_ID_KEY_SNEAK_BUTTON, gettext("Sneak"), "keymap_sneak");
 	this->add_key(GUI_ID_KEY_DROP_BUTTON, gettext("Drop"), "keymap_drop");
+	this->add_key(GUI_ID_KEY_ZOOM_BUTTON, gettext("Zoom"), "keymap_zoom");
 	this->add_key(GUI_ID_KEY_INVENTORY_BUTTON, gettext("Inventory"), "keymap_inventory");
 	this->add_key(GUI_ID_KEY_CHAT_BUTTON, gettext("Chat"), "keymap_chat");
 	this->add_key(GUI_ID_KEY_CMD_BUTTON, gettext("Command"), "keymap_cmd");

src/player.cpp

@@ -35,6 +35,7 @@ Player::Player(IGameDef *gamedef):
 	camera_barely_in_ceiling(false),
 	inventory(gamedef->idef()),
 	hp(PLAYER_MAX_HP),
+	zoom(false),
 	peer_id(PEER_ID_INEXISTENT),
 // protected
 	m_gamedef(gamedef),

src/player.h

@@ -227,6 +227,8 @@ public:
 	float hurt_tilt_timer;
 	float hurt_tilt_strength;
 
+	bool zoom;
+
 	u16 peer_id;
 	
 	std::string inventory_formspec;