From e6c33b0256b7dc0569aff36005eb24dab4ca0244 Mon Sep 17 00:00:00 2001
From: James Ravenscroft <ravenscroftj@gmail.com>
Date: Thu, 8 Aug 2013 10:32:34 +0100
Subject: [PATCH] Made player drowning implementation

---
 source/Player.cpp | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 source/Player.h   | 13 ++++++++++++-
 2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/source/Player.cpp b/source/Player.cpp
index ae119a1fb..0ec6bb5ca 100644
--- a/source/Player.cpp
+++ b/source/Player.cpp
@@ -40,6 +40,8 @@ cPlayer::cPlayer(cClientHandle* a_Client, const AString & a_PlayerName)
 	, m_IP("")
 	, m_LastBlockActionTime( 0 )
 	, m_LastBlockActionCnt( 0 )
+        , m_AirLevel( MAX_AIR_LEVEL )
+        , m_AirTickTimer( DROWNING_TICKS )
 	, m_bVisible( true )
 	, m_LastGroundHeight( 0 )
 	, m_bTouchGround( false )
@@ -178,6 +180,10 @@ void cPlayer::Tick(float a_Dt, cChunk & a_Chunk)
 	}
 	
 	super::Tick(a_Dt, a_Chunk);
+
+        //handle air drowning stuff
+        HandleAir(a_Chunk);
+
 	if (m_bDirtyPosition)
 	{
 		// Apply food exhaustion from movement:
@@ -1200,7 +1206,7 @@ bool cPlayer::LoadFromDisk()
 	}
 
 	m_Health = root.get("health", 0).asInt();
-	
+	m_AirLevel            = root.get("air",            MAX_AIR_LEVEL).asInt();
 	m_FoodLevel           = root.get("food",           MAX_FOOD_LEVEL).asInt();
 	m_FoodSaturationLevel = root.get("foodSaturation", MAX_FOOD_LEVEL).asDouble();
 	m_FoodTickTimer       = root.get("foodTickTimer",  0).asInt();
@@ -1246,6 +1252,7 @@ bool cPlayer::SaveToDisk()
 	root["rotation"]       = JSON_PlayerRotation;
 	root["inventory"]      = JSON_Inventory;
 	root["health"]         = m_Health;
+        root["air"]            = m_AirLevel;
 	root["food"]           = m_FoodLevel;
 	root["foodSaturation"] = m_FoodSaturationLevel;
 	root["foodTickTimer"]  = m_FoodTickTimer;
@@ -1313,7 +1320,43 @@ void cPlayer::UseEquippedItem()
 }
 
 
+void cPlayer::HandleAir(cChunk & a_Chunk)
+{
+        //Ref.: http://www.minecraftwiki.net/wiki/Chunk_format
 
+        //see if the player is /submerged/ water (block above is water)
+        // Get the type of block the player's standing in:
+	BLOCKTYPE BlockIn;
+	int RelX = (int)floor(m_LastPosX) - a_Chunk.GetPosX() * cChunkDef::Width;
+	int RelY = (int)floor(m_LastPosY + 1.1);
+	int RelZ = (int)floor(m_LastPosZ) - a_Chunk.GetPosZ() * cChunkDef::Width;
+	// Use Unbounded, because we're being called *after* processing super::Tick(), which could have changed our chunk
+	VERIFY(a_Chunk.UnboundedRelGetBlockType(RelX, RelY, RelZ, BlockIn));
+
+        if (IsBlockWater(BlockIn))
+	{
+            //either reduce air level or damage player
+            if(m_AirLevel < 1)
+            {
+                if(m_AirTickTimer < 1)
+                {
+                    //damage player 
+		    TakeDamage(dtDrowning, NULL, 1, 1, 0);
+                    //reset timer
+                    m_AirTickTimer = DROWNING_TICKS;
+                }else{
+                    m_AirTickTimer -= 1;
+                }
+            }else{
+                //reduce air supply
+                m_AirLevel -= 1;
+            }
+	}else{
+                //set the air back to maximum
+                m_AirLevel = MAX_AIR_LEVEL;
+                m_AirTickTimer = DROWNING_TICKS;
+        }
+}
 
 
 void cPlayer::HandleFood(void)
diff --git a/source/Player.h b/source/Player.h
index c8d66b842..c0fe31863 100644
--- a/source/Player.h
+++ b/source/Player.h
@@ -29,6 +29,8 @@ public:
 		MAX_HEALTH = 20,
 		MAX_FOOD_LEVEL = 20,
 		EATING_TICKS = 30,  ///< Number of ticks it takes to eat an item
+                MAX_AIR_LEVEL = 300,
+                DROWNING_TICKS = 10, //number of ticks per heart of damage
 	} ;
 	// tolua_end
 	
@@ -160,6 +162,8 @@ public:
 	int    GetFoodTickTimer             (void) const { return m_FoodTickTimer; }
 	double GetFoodExhaustionLevel       (void) const { return m_FoodExhaustionLevel; }
 	int    GetFoodPoisonedTicksRemaining(void) const { return m_FoodPoisonedTicksRemaining; }
+
+        int GetAirLevel                     (void) const { return m_AirLevel; }
 	
 	/// Returns true if the player is satiated, i. e. their foodlevel is at the max and they cannot eat anymore
 	bool IsSatiated(void) const { return (m_FoodLevel >= MAX_FOOD_LEVEL); }
@@ -267,6 +271,11 @@ protected:
 	std::string m_PlayerName;
 	std::string m_LoadedWorldName;
 
+        //Player's air level (for swimming)
+        int m_AirLevel;
+        //used to time ticks between damage taken via drowning/suffocation
+        int m_AirTickTimer;
+
 	bool m_bVisible;
 
 	// Food-related variables:
@@ -329,7 +338,6 @@ protected:
 	/// The world tick in which eating will be finished. -1 if not eating
 	Int64 m_EatingFinishTick;
 
-
 	virtual void Destroyed(void);
 
 	/// Filters out damage for creative mode
@@ -338,6 +346,9 @@ protected:
 	/// Called in each tick to handle food-related processing
 	void HandleFood(void);
 	
+        /// Called in each tick to handle air-related processing i.e. drowning
+        void HandleAir(cChunk & a_Chunk);
+
 	/// Adds food exhaustion based on the difference between Pos and LastPos, sprinting status and swimming (in water block)
 	void ApplyFoodExhaustionFromMovement(cChunk & a_Chunk);
 } ; // tolua_export