Add drowning

15 files changed, 67 insertions, 5 deletions

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 85f6ca5a6..d3d427d69 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -1710,6 +1710,7 @@ Node definition (register_node)
     liquid_alternative_source = "", -- Source version of flowing liquid
     liquid_viscosity = 0, -- Higher viscosity = slower flow (max. 7)
     liquid_renewable = true, -- Can new liquid source be created by placing
+    drowning = true, -- Player will drown in these
     two or more sources nearly?
     light_source = 0, -- Amount of light emitted by node
     damage_per_second = 0, -- If player is inside node, this damage is caused
diff --git a/games/minimal/mods/default/textures/bubble.png b/games/minimal/mods/default/textures/bubble.png
new file mode 100644
index 000000000..3bca7e11c
--- /dev/null
+++ b/games/minimal/mods/default/textures/bubble.png
diff --git a/src/client.cpp b/src/client.cpp
index 6b1789fe0..5f53e14f7 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -2680,6 +2680,13 @@ u16 Client::getHP()
 	return player->hp;
 }
 
+u16 Client::getBreath()
+{
+	Player *player = m_env.getLocalPlayer();
+	assert(player != NULL);
+	return player->breath;
+}
+
 bool Client::getChatMessage(std::wstring &message)
 {
 	if(m_chat_queue.size() == 0)
diff --git a/src/client.h b/src/client.h
index f0cc55868..1d231a5a3 100644
--- a/src/client.h
+++ b/src/client.h
@@ -349,6 +349,7 @@ public:
 	void setCrack(int level, v3s16 pos);
 
 	u16 getHP();
+	u16 getBreath();
 
 	bool checkPrivilege(const std::string &priv)
 	{ return (m_privileges.count(priv) != 0); }
diff --git a/src/environment.cpp b/src/environment.cpp
index a97a9bd08..99da5190c 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -2227,7 +2227,45 @@ void ClientEnvironment::step(float dtime)
 			damageLocalPlayer(damage_per_second, true);
 		}
 	}
-	
+
+	/*
+		Drowning
+	*/
+	if(m_drowning_interval.step(dtime, 2.0))
+	{
+		v3f pf = lplayer->getPosition();
+
+		// head
+		v3s16 p = floatToInt(pf + v3f(0, BS*1.6, 0), BS);
+		MapNode n = m_map->getNodeNoEx(p);
+		ContentFeatures c = m_gamedef->ndef()->get(n);
+
+		if(c.isLiquid() && c.drowning){
+			if(lplayer->breath > 10)
+				lplayer->breath = 11;
+			if(lplayer->breath > 0)
+				lplayer->breath -= 1;
+		}
+
+		if(lplayer->breath == 0){
+			damageLocalPlayer(1, true);
+		}
+	}
+	if(m_breathing_interval.step(dtime, 0.5))
+	{
+		v3f pf = lplayer->getPosition();
+
+		// head
+		v3s16 p = floatToInt(pf + v3f(0, BS*1.6, 0), BS);
+		MapNode n = m_map->getNodeNoEx(p);
+		ContentFeatures c = m_gamedef->ndef()->get(n);
+
+		if(!c.isLiquid() || !c.drowning){
+			if(lplayer->breath <= 10)
+				lplayer->breath += 1;
+		}
+	}
+
 	/*
 		Stuff that can be done in an arbitarily large dtime
 	*/
diff --git a/src/environment.h b/src/environment.h
index a62173a11..ac479999c 100644
--- a/src/environment.h
+++ b/src/environment.h
@@ -494,6 +494,8 @@ private:
 	Queue<ClientEnvEvent> m_client_event_queue;
 	IntervalLimiter m_active_object_light_update_interval;
 	IntervalLimiter m_lava_hurt_interval;
+	IntervalLimiter m_drowning_interval;
+	IntervalLimiter m_breathing_interval;
 	std::list<std::string> m_player_names;
 };
 
diff --git a/src/game.cpp b/src/game.cpp
index 30d9c7faf..88be47b39 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -3310,7 +3310,7 @@ void the_game(
 		if (show_hud)
 		{
 			hud.drawHotbar(v2s32(displaycenter.X, screensize.Y),
-					client.getHP(), client.getPlayerItem());
+					client.getHP(), client.getPlayerItem(), client.getBreath());
 		}
 
 		/*
diff --git a/src/hud.cpp b/src/hud.cpp
index a3ae38bcb..9404ed997 100644
--- a/src/hud.cpp
+++ b/src/hud.cpp
@@ -278,7 +278,7 @@ void Hud::drawStatbar(v2s32 pos, u16 corner, u16 drawdir, std::string texture, s
 }
 
 
-void Hud::drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem) {
+void Hud::drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem, s32 breath) {
 	InventoryList *mainlist = inventory->getList("main");
 	if (mainlist == NULL) {
 		errorstream << "draw_hotbar(): mainlist == NULL" << std::endl;
@@ -295,6 +295,9 @@ void Hud::drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem) {
 	if (player->hud_flags & HUD_FLAG_HEALTHBAR_VISIBLE)
 		drawStatbar(pos - v2s32(0, 4), HUD_CORNER_LOWER, HUD_DIR_LEFT_RIGHT,
 				"heart.png", halfheartcount, v2s32(0, 0));
+	if (player->hud_flags & HUD_FLAG_BREATHBAR_VISIBLE && breath <= 10)
+		drawStatbar(pos - v2s32(-180, 4), HUD_CORNER_LOWER, HUD_DIR_LEFT_RIGHT,
+				"bubble.png", breath*2, v2s32(0, 0));
 }
 
 
diff --git a/src/hud.h b/src/hud.h
index fa9d33f8b..c7289f7c4 100644
--- a/src/hud.h
+++ b/src/hud.h
@@ -35,6 +35,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define HUD_FLAG_HEALTHBAR_VISIBLE (1 << 1)
 #define HUD_FLAG_CROSSHAIR_VISIBLE (1 << 2)
 #define HUD_FLAG_WIELDITEM_VISIBLE (1 << 3)
+#define HUD_FLAG_BREATHBAR_VISIBLE (1 << 4)
 
 #define HUD_PARAM_HOTBAR_ITEMCOUNT 1
 
@@ -122,7 +123,7 @@ public:
 	void drawStatbar(v2s32 pos, u16 corner, u16 drawdir,
 					 std::string texture, s32 count, v2s32 offset);
 	
-	void drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem);
+	void drawHotbar(v2s32 centerlowerpos, s32 halfheartcount, u16 playeritem, s32 breath);
 	void resizeHotbar();
 	
 	void drawCrosshair();
diff --git a/src/nodedef.cpp b/src/nodedef.cpp
index ba3e42e98..7d8ce70d3 100644
--- a/src/nodedef.cpp
+++ b/src/nodedef.cpp
@@ -211,6 +211,7 @@ void ContentFeatures::reset()
 	liquid_alternative_source = "";
 	liquid_viscosity = 0;
 	liquid_renewable = true;
+	drowning = true;
 	light_source = 0;
 	damage_per_second = 0;
 	node_box = NodeBox();
@@ -279,6 +280,7 @@ void ContentFeatures::serialize(std::ostream &os, u16 protocol_version)
 	writeU8(os, rightclickable);
 	// Stuff below should be moved to correct place in a version that otherwise changes
 	// the protocol version
+	writeU8(os, drowning);
 }
 
 void ContentFeatures::deSerialize(std::istream &is)
@@ -343,6 +345,7 @@ void ContentFeatures::deSerialize(std::istream &is)
 	try{
 		// Stuff below should be moved to correct place in a version that
 		// otherwise changes the protocol version
+		drowning = readU8(is);
 	}catch(SerializationError &e) {};
 }
 
diff --git a/src/nodedef.h b/src/nodedef.h
index 2691aca33..e397d20e0 100644
--- a/src/nodedef.h
+++ b/src/nodedef.h
@@ -219,6 +219,7 @@ struct ContentFeatures
 	u8 liquid_viscosity;
 	// Is liquid renewable (new liquid source will be created between 2 existing)
 	bool liquid_renewable;
+	bool drowning;
 	// Amount of light the node emits
 	u8 light_source;
 	u32 damage_per_second;
diff --git a/src/player.cpp b/src/player.cpp
index 4eb5955c0..a199c9a6c 100644
--- a/src/player.cpp
+++ b/src/player.cpp
@@ -36,6 +36,7 @@ Player::Player(IGameDef *gamedef):
 	camera_barely_in_ceiling(false),
 	inventory(gamedef->idef()),
 	hp(PLAYER_MAX_HP),
+	breath(-1),
 	peer_id(PEER_ID_INEXISTENT),
 // protected
 	m_gamedef(gamedef),
@@ -80,7 +81,8 @@ Player::Player(IGameDef *gamedef):
 	physics_override_gravity = 1;
 
 	hud_flags = HUD_FLAG_HOTBAR_VISIBLE | HUD_FLAG_HEALTHBAR_VISIBLE |
-			 HUD_FLAG_CROSSHAIR_VISIBLE | HUD_FLAG_WIELDITEM_VISIBLE;
+			 HUD_FLAG_CROSSHAIR_VISIBLE | HUD_FLAG_WIELDITEM_VISIBLE |
+			 HUD_FLAG_BREATHBAR_VISIBLE;
 
 	hud_hotbar_itemcount = HUD_HOTBAR_ITEMCOUNT_DEFAULT;
 }
diff --git a/src/player.h b/src/player.h
index d3738fd52..517bd354d 100644
--- a/src/player.h
+++ b/src/player.h
@@ -232,6 +232,7 @@ public:
 	float physics_override_gravity;
 
 	u16 hp;
+	u16 breath;
 
 	float hurt_tilt_timer;
 	float hurt_tilt_strength;
diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
index c7966a0be..64c76ef7c 100644
--- a/src/script/common/c_content.cpp
+++ b/src/script/common/c_content.cpp
@@ -389,6 +389,7 @@ ContentFeatures read_content_features(lua_State *L, int index)
 	f.liquid_viscosity = getintfield_default(L, index,
 			"liquid_viscosity", f.liquid_viscosity);
 	getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
+	getboolfield(L, index, "drowning", f.drowning);
 	// Amount of light the node emits
 	f.light_source = getintfield_default(L, index,
 			"light_source", f.light_source);
diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index 1e45610a6..f90b59285 100644
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -62,6 +62,7 @@ struct EnumString es_HudBuiltinElement[] =
 	{HUD_FLAG_HEALTHBAR_VISIBLE, "healthbar"},
 	{HUD_FLAG_CROSSHAIR_VISIBLE, "crosshair"},
 	{HUD_FLAG_WIELDITEM_VISIBLE, "wielditem"},
+	{HUD_FLAG_BREATHBAR_VISIBLE, "breathbar"},
 	{0, NULL},
 };