7 files changed, 38 insertions, 16 deletions

diff --git a/src/Blocks/BlockButton.h b/src/Blocks/BlockButton.h
index ec897835a..c898a0466 100644
--- a/src/Blocks/BlockButton.h
+++ b/src/Blocks/BlockButton.h
@@ -18,14 +18,14 @@ public:
 	
 	virtual void OnUse(cWorld * a_World, cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ) override
 	{
-		// Flip the ON bit on/off using the XOR bitwise operation
+		// Set p the ON bit to on
 		NIBBLETYPE Meta = (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) | 0x08);
 
 		a_World->SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, Meta);
 		a_World->BroadcastSoundEffect("random.click", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, (Meta & 0x08) ? 0.6f : 0.5f);
 
 		// Queue a button reset (unpress)
-		a_World->QueueSetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x07), m_BlockType == E_BLOCK_STONE_BUTTON ? 20 : 30);
+		a_World->QueueSetBlock(a_BlockX, a_BlockY, a_BlockZ, m_BlockType, (a_World->GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x07), m_BlockType == E_BLOCK_STONE_BUTTON ? 20 : 30, m_BlockType);
 	}
 
 	
diff --git a/src/Chunk.cpp b/src/Chunk.cpp
index 5c9eb892b..53c7f3a82 100644
--- a/src/Chunk.cpp
+++ b/src/Chunk.cpp
@@ -701,9 +701,30 @@ void cChunk::ProcessQueuedSetBlocks(void)
 	{
 		if (itr->m_Tick <= CurrTick)
 		{
-			// Current world age is bigger than/equal to target world age - delay time reached
-			SetBlock(itr->m_RelX, itr->m_RelY, itr->m_RelZ, itr->m_BlockType, itr->m_BlockMeta);
-			itr = m_SetBlockQueue.erase(itr);
+			if (itr->m_PreviousType != E_BLOCK_AIR) // PreviousType defaults to -1 if not specified
+			{
+				if (GetBlock(itr->m_RelX, itr->m_RelY, itr->m_RelZ) == itr->m_PreviousType)
+				{
+					// Current world age is bigger than/equal to target world age - delay time reached AND
+					// Previous block type was the same as current block type (to prevent duplication)
+					// Since blocktypes were the same, we just need to set the meta
+					SetMeta(itr->m_RelX, itr->m_RelY, itr->m_RelZ, itr->m_BlockMeta);
+					itr = m_SetBlockQueue.erase(itr);
+					LOGD("Successfully set queued block - previous and current types matched");
+				}
+				else
+				{
+					itr = m_SetBlockQueue.erase(itr);
+					LOGD("Failure setting queued block - previous and current blocktypes didn't match");
+				}
+			}
+			else
+			{
+				// Current world age is bigger than/equal to target world age - delay time reached
+				SetBlock(itr->m_RelX, itr->m_RelY, itr->m_RelZ, itr->m_BlockType, itr->m_BlockMeta);
+				itr = m_SetBlockQueue.erase(itr);
+				LOGD("Successfully set queued block - previous type ignored");
+			}
 		}
 		else
 		{
@@ -1410,9 +1431,9 @@ void cChunk::SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType,
 
 
 
-void cChunk::QueueSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick)
+void cChunk::QueueSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType)
 {
-	m_SetBlockQueue.push_back(sSetBlockQueueItem(a_RelX, a_RelY, a_RelZ, a_BlockType, a_BlockMeta, a_Tick));
+	m_SetBlockQueue.push_back(sSetBlockQueueItem(a_RelX, a_RelY, a_RelZ, a_BlockType, a_BlockMeta, a_Tick, a_PreviousBlockType));
 }
 
 
diff --git a/src/Chunk.h b/src/Chunk.h
index f13eb9a03..7ff14024c 100644
--- a/src/Chunk.h
+++ b/src/Chunk.h
@@ -149,7 +149,7 @@ public:
 	void SetBlock( const Vector3i & a_RelBlockPos, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta ) { SetBlock( a_RelBlockPos.x, a_RelBlockPos.y, a_RelBlockPos.z, a_BlockType, a_BlockMeta ); }
 	
 	/// Queues a block change till the specified world tick
-	void QueueSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick);
+	void QueueSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType = E_BLOCK_AIR);
 	
 	/// Queues block for ticking (m_ToTickQueue)
 	void QueueTickBlock(int a_RelX, int a_RelY, int a_RelZ);
@@ -363,9 +363,10 @@ private:
 		BLOCKTYPE m_BlockType;
 		NIBBLETYPE m_BlockMeta;
 		Int64 m_Tick;
+		BLOCKTYPE m_PreviousType;
 		
-		sSetBlockQueueItem(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick) :
-			m_RelX(a_RelX), m_RelY(a_RelY), m_RelZ(a_RelZ), m_BlockType(a_BlockType), m_BlockMeta(a_BlockMeta), m_Tick(a_Tick)
+		sSetBlockQueueItem(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType) :
+			m_RelX(a_RelX), m_RelY(a_RelY), m_RelZ(a_RelZ), m_BlockType(a_BlockType), m_BlockMeta(a_BlockMeta), m_Tick(a_Tick), m_PreviousType(a_PreviousBlockType)
 		{
 		}
 	} ;
diff --git a/src/ChunkMap.cpp b/src/ChunkMap.cpp
index a6caa5ef7..f3241bd54 100644
--- a/src/ChunkMap.cpp
+++ b/src/ChunkMap.cpp
@@ -1173,7 +1173,7 @@ void cChunkMap::SetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_B
 
 
 
-void cChunkMap::QueueSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta, Int64 a_Tick)
+void cChunkMap::QueueSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType)
 {
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(X, Y, Z, ChunkX, ChunkZ);
@@ -1182,7 +1182,7 @@ void cChunkMap::QueueSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYP
 	cChunkPtr Chunk = GetChunk(ChunkX, ZERO_CHUNK_Y, ChunkZ);
 	if ((Chunk != NULL) && Chunk->IsValid())
 	{
-		Chunk->QueueSetBlock(X, Y, Z, a_BlockType, a_BlockMeta, a_Tick);
+		Chunk->QueueSetBlock(X, Y, Z, a_BlockType, a_BlockMeta, a_Tick, a_PreviousBlockType);
 	}
 }
 
diff --git a/src/ChunkMap.h b/src/ChunkMap.h
index b3fe25393..2a529f43d 100644
--- a/src/ChunkMap.h
+++ b/src/ChunkMap.h
@@ -138,7 +138,7 @@ public:
 	NIBBLETYPE GetBlockBlockLight(int a_BlockX, int a_BlockY, int a_BlockZ);
 	void       SetBlockMeta      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockMeta);
 	void       SetBlock          (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta);
-	void       QueueSetBlock     (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta, Int64 a_Tick);
+	void       QueueSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType = E_BLOCK_AIR);
 	bool       GetBlockTypeMeta  (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
 	bool       GetBlockInfo      (int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
 
diff --git a/src/World.cpp b/src/World.cpp
index 04eab1851..0cf34b861 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -1470,9 +1470,9 @@ void cWorld::FastSetBlock(int a_X, int a_Y, int a_Z, BLOCKTYPE a_BlockType, NIBB
 
 
 
-void cWorld::QueueSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, int a_TickDelay)
+void cWorld::QueueSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, int a_TickDelay, BLOCKTYPE a_PreviousBlockType)
 {
-	m_ChunkMap->QueueSetBlock(a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, GetWorldAge() + a_TickDelay);
+	m_ChunkMap->QueueSetBlock(a_BlockX, a_BlockY, a_BlockZ, a_BlockType, a_BlockMeta, GetWorldAge() + a_TickDelay, a_PreviousBlockType);
 }
 
 
diff --git a/src/World.h b/src/World.h
index ea0db53e6..c865bb73f 100644
--- a/src/World.h
+++ b/src/World.h
@@ -317,7 +317,7 @@ public:
 	/** Queues a SetBlock() with the specified parameters after the specified number of ticks.
 	Calls SetBlock(), so performs full processing of the replaced block.
 	*/
-	void QueueSetBlock(int a_BlockX, int a_BLockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, int a_TickDelay);
+	void QueueSetBlock(int a_BlockX, int a_BLockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, int a_TickDelay, BLOCKTYPE a_PreviousBlockType = E_BLOCK_AIR);
 	
 	BLOCKTYPE  GetBlock          (int a_BlockX, int a_BlockY, int a_BlockZ);
 	NIBBLETYPE GetBlockMeta      (int a_BlockX, int a_BlockY, int a_BlockZ);