6 files changed, 140 insertions, 33 deletions

diff --git a/VC2008/MCServer.vcproj b/VC2008/MCServer.vcproj
index fbbd999a9..9688aa981 100644
--- a/VC2008/MCServer.vcproj
+++ b/VC2008/MCServer.vcproj
@@ -2016,6 +2016,9 @@
 					>
 				</File>
 				<File
+					RelativePath="..\source\Blocks\BlockDoubleSlab.h"
+				</File>
+				<File
 					RelativePath="..\source\blocks\BlockDirt.h"
 					>
 				</File>
diff --git a/source/Blocks/BlockDoubleSlab.h b/source/Blocks/BlockDoubleSlab.h
new file mode 100644
index 000000000..c91fe64e6
--- /dev/null
+++ b/source/Blocks/BlockDoubleSlab.h
@@ -0,0 +1,36 @@
+
+#pragma once
+
+#include "BlockHandler.h"
+#include "../Items/ItemHandler.h"
+
+
+
+
+
+class cBlockDoubleSlabHandler :
+	public cBlockHandler
+{
+public:
+	cBlockDoubleSlabHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
+
+
+	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
+	{
+		char Count = ((m_BlockType == E_BLOCK_DOUBLE_STONE_SLAB) || (m_BlockType == E_BLOCK_DOUBLE_WOODEN_SLAB)) ? 2 : 1;
+		a_Pickups.push_back(cItem(m_BlockType, Count, a_BlockMeta));
+	}
+
+	
+	virtual const char * GetStepSound(void) override
+	{		
+		return ((m_BlockType == E_BLOCK_DOUBLE_WOODEN_SLAB) || (m_BlockType == E_BLOCK_DOUBLE_WOODEN_SLAB)) ?  "step.wood" : "step.stone";
+	}
+} ;
+
+
+
+
diff --git a/source/Blocks/BlockHandler.cpp b/source/Blocks/BlockHandler.cpp
index 0fa013058..22efa25f5 100644
--- a/source/Blocks/BlockHandler.cpp
+++ b/source/Blocks/BlockHandler.cpp
@@ -17,6 +17,7 @@
 #include "BlockDeadBush.h"
 #include "BlockDirt.h"
 #include "BlockDoor.h"
+#include "BlockDoubleSlab.h"
 #include "BlockDropSpenser.h"
 #include "BlockEnderchest.h"
 #include "BlockEntity.h"
@@ -117,8 +118,8 @@ cBlockHandler * cBlockHandler::CreateBlockHandler(BLOCKTYPE a_BlockType)
 		case E_BLOCK_DIAMOND_ORE:           return new cBlockOreHandler             (a_BlockType);
 		case E_BLOCK_DIRT:                  return new cBlockDirtHandler            (a_BlockType);
 		case E_BLOCK_DISPENSER:             return new cBlockDropSpenserHandler     (a_BlockType);
-		case E_BLOCK_DOUBLE_STONE_SLAB:     return new cBlockSlabHandler            (a_BlockType);
-		case E_BLOCK_DOUBLE_WOODEN_SLAB:    return new cBlockSlabHandler            (a_BlockType);
+		case E_BLOCK_DOUBLE_STONE_SLAB:     return new cBlockDoubleSlabHandler      (a_BlockType);
+		case E_BLOCK_DOUBLE_WOODEN_SLAB:    return new cBlockDoubleSlabHandler      (a_BlockType);
 		case E_BLOCK_DROPPER:               return new cBlockDropSpenserHandler     (a_BlockType);
 		case E_BLOCK_EMERALD_ORE:           return new cBlockOreHandler             (a_BlockType);
 		case E_BLOCK_ENDER_CHEST:           return new cBlockEnderchestHandler      (a_BlockType);
diff --git a/source/Blocks/BlockSlab.h b/source/Blocks/BlockSlab.h
index 44e1962b9..881a85615 100644
--- a/source/Blocks/BlockSlab.h
+++ b/source/Blocks/BlockSlab.h
@@ -6,7 +6,6 @@
 
 
 
-
 class cBlockSlabHandler :
 	public cBlockHandler
 {
@@ -19,7 +18,7 @@ public:
 
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
 	{
-		char Count = ((m_BlockType == E_BLOCK_DOUBLE_STONE_SLAB) || (m_BlockType == E_BLOCK_DOUBLE_WOODEN_SLAB)) ? 2 : 1;
+		char Count = ((m_BlockType == E_BLOCK_STONE_SLAB) || (m_BlockType == E_BLOCK_WOODEN_SLAB)) ? 1 : 1;
 		a_Pickups.push_back(cItem(m_BlockType, Count, a_BlockMeta));
 	}
 
@@ -32,22 +31,46 @@ public:
 	) override
 	{
 		a_BlockType = m_BlockType;
+		BLOCKTYPE Type = (BLOCKTYPE)(a_Player->GetEquippedItem().m_ItemType);
 		NIBBLETYPE Meta = (NIBBLETYPE)(a_Player->GetEquippedItem().m_ItemDamage & 0x07);
+		
+		int DoubleType;
+		if (Type == E_BLOCK_STONE_SLAB)
+		{
+			DoubleType = 43; //Make it a double slab (with old type wood)
+		}
+		else
+		{
+			 DoubleType = 125; //Make it a wooden double slab (new type)
+		}
+		cItemHandler * ItemHandler = cItemHandler::GetItemHandler(DoubleType);
+
 		switch (a_BlockFace)
 		{
 			case BLOCK_FACE_TOP:
 			{
-				if (a_World->GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ) == E_BLOCK_STONE_SLAB)
+				if ((a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_STONE_SLAB) || (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_WOODEN_SLAB))
 				{
-					a_World->FastSetBlock(a_BlockX, a_BlockY - 1, a_BlockZ, E_BLOCK_DOUBLE_STONE_SLAB, Meta); //Set it to a slabby block
-					a_BlockType = E_BLOCK_AIR; //Stop the server trying to place another slab on top
+					a_Player->GetClientHandle()->HandlePlaceBlock(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, a_CursorX, a_CursorY, a_CursorZ, *ItemHandler);
+					return false;
 				}
 				else
 				{
 					a_BlockMeta = Meta & 0x7; break;  //Bottom half if on top of non slab block
 				}
 			}
-			case BLOCK_FACE_BOTTOM: a_BlockMeta = Meta | 0x8; break;  //Always top when placing on bottom of something
+			case BLOCK_FACE_BOTTOM:
+			{
+				if ((a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_STONE_SLAB) || (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_WOODEN_SLAB))
+				{
+					a_Player->GetClientHandle()->HandlePlaceBlock(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, a_CursorX, a_CursorY, a_CursorZ, *ItemHandler);
+					return false;
+				}
+				else
+				{
+					a_BlockMeta = Meta | 0x8; break;  //Bottom half if on top of non slab block
+				}
+			}
 			case BLOCK_FACE_EAST:
 			case BLOCK_FACE_NORTH:
 			case BLOCK_FACE_SOUTH:
@@ -56,14 +79,29 @@ public:
 				if (a_CursorY > 7)
 				{
 					// Cursor at the top half of the face, place a top half of slab
-					a_BlockMeta = Meta | 0x8;
+					if ((a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_STONE_SLAB) || (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_WOODEN_SLAB))
+					{
+						a_Player->GetClientHandle()->HandlePlaceBlock(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, a_CursorX, a_CursorY, a_CursorZ, *ItemHandler);
+						return false;
+					}
+					else
+					{
+						a_BlockMeta = Meta | 0x8; break;
+					}
 				}
 				else
 				{
 					// Cursor at the bottom half of the face, place a bottom half of slab:
-					a_BlockMeta = Meta & 0x7;
+					if ((a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_STONE_SLAB) || (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_WOODEN_SLAB))
+					{
+						a_Player->GetClientHandle()->HandlePlaceBlock(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, a_CursorX, a_CursorY, a_CursorZ, *ItemHandler);
+						return false;
+					}
+					else
+					{
+						a_BlockMeta = Meta & 0x7; break;
+					}
 				}
-				break;
 			}
 		}  // switch (a_BlockFace)
 		return true;
@@ -72,7 +110,7 @@ public:
 	
 	virtual const char * GetStepSound(void) override
 	{		
-		return ((m_BlockType == E_BLOCK_WOODEN_SLAB) || (m_BlockType == E_BLOCK_DOUBLE_WOODEN_SLAB)) ?  "step.wood" : "step.stone";
+		return ((m_BlockType == E_BLOCK_WOODEN_SLAB) || (m_BlockType == E_BLOCK_STONE_SLAB)) ?  "step.wood" : "step.stone";
 	}
 } ;
 
diff --git a/source/ClientHandle.cpp b/source/ClientHandle.cpp
index 57830f63c..937aebd1a 100644
--- a/source/ClientHandle.cpp
+++ b/source/ClientHandle.cpp
@@ -846,33 +846,62 @@ void cClientHandle::HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, c
 	}
 	
 	cWorld * World = m_Player->GetWorld();
-	
-	// Check if the block ignores build collision (water, grass etc.):
-	BLOCKTYPE ClickedBlock = World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
-	cBlockHandler * Handler = cBlockHandler::GetBlockHandler(ClickedBlock);
-	if (Handler->DoesIgnoreBuildCollision())
+
+	BLOCKTYPE ClickedBlock;
+	NIBBLETYPE ClickedBlockMeta;
+	BLOCKTYPE EquippedBlock = (BLOCKTYPE)(m_Player->GetEquippedItem().m_ItemType);
+	NIBBLETYPE EquippedBlockDamage = (NIBBLETYPE)(m_Player->GetEquippedItem().m_ItemDamage);
+
+	World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, ClickedBlock, ClickedBlockMeta);
+
+	//Special slab handler coding
+	if (
+		((a_BlockFace == BLOCK_FACE_TOP) || (a_BlockFace == BLOCK_FACE_BOTTOM)) &&
+		((ClickedBlock == E_BLOCK_STONE_SLAB) || (ClickedBlock == E_BLOCK_WOODEN_SLAB)) && //Is clicked a slab?
+		((EquippedBlock == E_BLOCK_STONE_SLAB) || (EquippedBlock == E_BLOCK_WOODEN_SLAB)) && //Is equipped a slab?		
+		((ClickedBlockMeta & 0x07) == (EquippedBlockDamage & 0x07)) //Is clicked same type of slab as item in hand?
+		)
 	{
-		Handler->OnDestroyedByPlayer(World, m_Player, a_BlockX, a_BlockY, a_BlockZ);
-		// World->FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_AIR, 0);
+		//Don't move the coordinates
 	}
 	else
 	{
-		AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace);
-		// Check for Blocks not allowing placement on top
-		if ((a_BlockFace == BLOCK_FACE_TOP) && !Handler->DoesAllowBlockOnTop())
+		//Check if the block ignores build collision (water, grass etc.):
+		cBlockHandler * Handler = cBlockHandler::GetBlockHandler(ClickedBlock);
+		if (Handler->DoesIgnoreBuildCollision())
 		{
-			// Resend the old block
-			// Some times the client still places the block O.o
-			World->SendBlockTo(a_BlockX, a_BlockY, a_BlockZ, m_Player);
-			return;
+			Handler->OnDestroyedByPlayer(World, m_Player, a_BlockX, a_BlockY, a_BlockZ);
+			//World->FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_AIR, 0);
 		}
-
-
-		BLOCKTYPE PlaceBlock = World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
-		if (!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision())
+		else
 		{
-			// Tried to place a block *into* another?
-			return;  // Happens when you place a block aiming at side of block like torch or stem
+			AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace);
+			//On side of block, make sure that placement won't be cancelled if there is a slab there
+			//No need to combinability checks, client will do that
+			if ((World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_STONE_SLAB) || (World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_WOODEN_SLAB))
+			{
+				//Is a slab, don't do checks and proceed to double-slabbing
+			}
+			else
+			{
+				// Check for Blocks not allowing placement on top
+				if ((a_BlockFace == BLOCK_FACE_TOP) && !Handler->DoesAllowBlockOnTop())
+				{
+					// Resend the old block
+					// Some times the client still places the block O.o
+					World->SendBlockTo(a_BlockX, a_BlockY, a_BlockZ, m_Player);
+					return;
+				}
+	
+	
+				BLOCKTYPE PlaceBlock = World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
+				if (!BlockHandler(PlaceBlock)->DoesIgnoreBuildCollision())
+				{
+					// Tried to place a block *into* another?
+					// Happens when you place a block aiming at side of block like torch or stem
+					return;
+				}
+			}
 		}
 	}
 
diff --git a/source/ClientHandle.h b/source/ClientHandle.h
index c85257df1..a2e29f9dc 100644
--- a/source/ClientHandle.h
+++ b/source/ClientHandle.h
@@ -312,7 +312,7 @@ private:
 	void HandleBlockDigFinished(int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, BLOCKTYPE a_OldBlock, NIBBLETYPE a_OldMeta);
 
 	/// Handles the block placing packet when it is a real block placement (not block-using, item-using or eating)
-	void HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, cItemHandler & a_ItemHandler);
+	public: void HandlePlaceBlock(int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, cItemHandler & a_ItemHandler);
 	
 	// cSocketThreads::cCallback overrides:
 	virtual void DataReceived   (const char * a_Data, int a_Size) override;  // Data is received from the client