5 files changed, 152 insertions, 9 deletions
diff --git a/src/Entities/EntityEffect.cpp b/src/Entities/EntityEffect.cpp
index 6c4b13a58..fdcbe822e 100644
--- a/src/Entities/EntityEffect.cpp
+++ b/src/Entities/EntityEffect.cpp
@@ -7,6 +7,130 @@
 
 
 
+
+int cEntityEffect::GetPotionColor(short a_ItemDamage)
+{
+	// Lowest six bits
+	return (a_ItemDamage & 0x3f);
+}
+
+
+
+
+
+cEntityEffect::eType cEntityEffect::GetPotionEffectType(short a_ItemDamage)
+{
+	// Lowest four bits
+	// Potion effect bits are different from entity effect values
+	// For reference: http://minecraft.gamepedia.com/Data_values#.22Potion_effect.22_bits
+	switch (a_ItemDamage & 0x0f)
+	{
+		case 0x01: return cEntityEffect::effRegeneration;
+		case 0x02: return cEntityEffect::effSpeed;
+		case 0x03: return cEntityEffect::effFireResistance;
+		case 0x04: return cEntityEffect::effPoison;
+		case 0x05: return cEntityEffect::effInstantHealth;
+		case 0x06: return cEntityEffect::effNightVision;
+		case 0x08: return cEntityEffect::effWeakness;
+		case 0x09: return cEntityEffect::effStrength;
+		case 0x0a: return cEntityEffect::effSlowness;
+		case 0x0c: return cEntityEffect::effInstantDamage;
+		case 0x0d: return cEntityEffect::effWaterBreathing;
+		case 0x0e: return cEntityEffect::effInvisibility;
+			
+		// No effect potions
+		case 0x00:
+		case 0x07:
+		case 0x0b:  // Will be potion of leaping in 1.8
+		case 0x0f:
+		{
+			break;
+		}
+	}
+	return cEntityEffect::effNoEffect;
+}
+
+
+
+
+
+short cEntityEffect::GetPotionEffectIntensity(short a_ItemDamage)
+{
+	// Level II potion if the fifth lowest bit is set
+	return ((a_ItemDamage & 0x20) != 0) ? 1 : 0;
+}
+
+
+
+
+
+int cEntityEffect::GetPotionEffectDuration(short a_ItemDamage)
+{
+	// Base duration in ticks
+	int base = 0;
+	double TierCoeff = 1, ExtCoeff = 1, SplashCoeff = 1;
+	
+	switch (GetPotionEffectType(a_ItemDamage))
+	{
+		case cEntityEffect::effRegeneration:
+		case cEntityEffect::effPoison:
+		{
+			base = 900;
+			break;
+		}
+			
+		case cEntityEffect::effSpeed:
+		case cEntityEffect::effFireResistance:
+		case cEntityEffect::effNightVision:
+		case cEntityEffect::effStrength:
+		case cEntityEffect::effWaterBreathing:
+		case cEntityEffect::effInvisibility:
+		{
+			base = 3600;
+			break;
+		}
+			
+		case cEntityEffect::effWeakness:
+		case cEntityEffect::effSlowness:
+		{
+			base = 1800;
+			break;
+		}
+	}
+	
+	// If potion is level II, half the duration. If not, stays the same
+	TierCoeff = (GetPotionEffectIntensity(a_ItemDamage) > 0) ? 0.5 : 1;
+	
+	// If potion is extended, multiply duration by 8/3. If not, stays the same
+	// Extended potion if sixth lowest bit is set
+	ExtCoeff = (a_ItemDamage & 0x40) ? (8.0 / 3.0) : 1;
+	
+	// If potion is splash potion, multiply duration by 3/4. If not, stays the same
+	SplashCoeff = IsPotionDrinkable(a_ItemDamage) ? 1 : 0.75;
+	
+	// Ref.:
+	//   http://minecraft.gamepedia.com/Data_values#.22Tier.22_bit
+	//   http://minecraft.gamepedia.com/Data_values#.22Extended_duration.22_bit
+	//   http://minecraft.gamepedia.com/Data_values#.22Splash_potion.22_bit
+	
+	return (int)(base * TierCoeff * ExtCoeff * SplashCoeff);
+}
+
+
+
+
+
+bool cEntityEffect::IsPotionDrinkable(short a_ItemDamage)
+{
+	// Drinkable potion if 13th lowest bit is set
+	// Ref.: http://minecraft.gamepedia.com/Potions#Data_value_table
+	return ((a_ItemDamage & 0x2000) != 0);
+}
+
+
+
+
+
 cEntityEffect::cEntityEffect():
 	m_Ticks(0),
 	m_Duration(0),
diff --git a/src/Entities/EntityEffect.h b/src/Entities/EntityEffect.h
index 396a9bbe0..f9c1e4eb2 100644
--- a/src/Entities/EntityEffect.h
+++ b/src/Entities/EntityEffect.h
@@ -36,6 +36,24 @@ public:
 		effSaturation     = 23,
 	} ;
 	
+	/** Returns the potion color (used by the client for visuals), based on the potion's damage value */
+	static int GetPotionColor(short a_ItemDamage);
+	
+	
+	/** Translates the potion's damage value into the entity effect that the potion gives */
+	static cEntityEffect::eType GetPotionEffectType(short a_ItemDamage);
+	
+	
+	/** Retrieves the intensity level from the potion's damage value. Returns 0 for level I potions, 1 for level II potions. */
+	static short GetPotionEffectIntensity(short a_ItemDamage);
+	
+	
+	/** Returns the effect duration, in ticks, based on the potion's damage value */
+	static int GetPotionEffectDuration(short a_ItemDamage);
+	
+	/** Returns true if the potion with the given damage is drinkable */
+	static bool IsPotionDrinkable(short a_ItemDamage);
+	
 	// tolua_end
 	
 	/** Creates an empty entity effect */
diff --git a/src/Entities/ProjectileEntity.cpp b/src/Entities/ProjectileEntity.cpp
index b5e81bc0c..43023ec28 100644
--- a/src/Entities/ProjectileEntity.cpp
+++ b/src/Entities/ProjectileEntity.cpp
@@ -22,6 +22,7 @@
 #include "FireworkEntity.h"
 #include "GhastFireballEntity.h"
 #include "WitherSkullEntity.h"
+#include "SplashPotionEntity.h"
 #include "Player.h"
 
 
@@ -263,6 +264,7 @@ cProjectileEntity * cProjectileEntity::Create(eKind a_Kind, cEntity * a_Creator,
 		case pkGhastFireball: return new cGhastFireballEntity   (a_Creator, a_X, a_Y, a_Z, Speed);
 		case pkFireCharge:    return new cFireChargeEntity      (a_Creator, a_X, a_Y, a_Z, Speed);
 		case pkExpBottle:     return new cExpBottleEntity       (a_Creator, a_X, a_Y, a_Z, Speed);
+		case pkSplashPotion:  return new cSplashPotionEntity    (a_Creator, a_X, a_Y, a_Z, Speed, *a_Item);
 		case pkWitherSkull:   return new cWitherSkullEntity     (a_Creator, a_X, a_Y, a_Z, Speed);
 		case pkFirework:
 		{
diff --git a/src/Entities/SplashPotionEntity.cpp b/src/Entities/SplashPotionEntity.cpp
index 6d874e957..fd1a0179b 100644
--- a/src/Entities/SplashPotionEntity.cpp
+++ b/src/Entities/SplashPotionEntity.cpp
@@ -72,17 +72,18 @@ cSplashPotionEntity::cSplashPotionEntity(
 	cEntity * a_Creator,
 	double a_X, double a_Y, double a_Z,
 	const Vector3d & a_Speed,
-	cEntityEffect::eType a_EntityEffectType,
-	cEntityEffect a_EntityEffect,
-	int a_PotionColor
+	const cItem & a_Item
 ) :
 	super(pkSplashPotion, a_Creator, a_X, a_Y, a_Z, 0.25, 0.25),
-	m_EntityEffectType(a_EntityEffectType),
-	m_EntityEffect(a_EntityEffect),
-	m_PotionColor(a_PotionColor),
 	m_DestroyTimer(-1)
 {
 	SetSpeed(a_Speed);
+	m_EntityEffectType = cEntityEffect::GetPotionEffectType(a_Item.m_ItemDamage);
+	m_EntityEffect = cEntityEffect(
+		cEntityEffect::GetPotionEffectDuration(a_Item.m_ItemDamage),
+		cEntityEffect::GetPotionEffectIntensity(a_Item.m_ItemDamage)
+	);
+	m_PotionColor = cEntityEffect::GetPotionColor(a_Item.m_ItemDamage);
 }
 
 
diff --git a/src/Entities/SplashPotionEntity.h b/src/Entities/SplashPotionEntity.h
index dd14ea82f..4afc5f204 100644
--- a/src/Entities/SplashPotionEntity.h
+++ b/src/Entities/SplashPotionEntity.h
@@ -29,9 +29,7 @@ public:
 		cEntity * a_Creator,
 		double a_X, double a_Y, double a_Z,
 		const Vector3d & a_Speed,
-		cEntityEffect::eType a_EntityEffectType,
-		cEntityEffect a_EntityEffect,
-		int a_PotionColor
+		const cItem & a_Item
 	);
 	
 	cEntityEffect::eType GetEntityEffectType(void) const { return m_EntityEffectType; }