5 files changed, 310 insertions, 11 deletions

diff --git a/src/Blocks/BlockDropSpenser.h b/src/Blocks/BlockDropSpenser.h
index 88b61a418..e2b3039fd 100644
--- a/src/Blocks/BlockDropSpenser.h
+++ b/src/Blocks/BlockDropSpenser.h
@@ -5,7 +5,7 @@
 
 #pragma once
 
-#include "../Piston.h"
+#include "../Blocks/BlockPiston.h"
 #include "MetaRotator.h"
 
 
@@ -32,7 +32,7 @@ public:
 		a_BlockType = m_BlockType;
 		
 		// FIXME: Do not use cPiston class for dispenser placement!
-		a_BlockMeta = cPiston::RotationPitchToMetaData(a_Player->GetYaw(), a_Player->GetPitch());
+		a_BlockMeta = cBlockPistonHandler::RotationPitchToMetaData(a_Player->GetYaw(), a_Player->GetPitch());
 		return true;
 	}
 	
diff --git a/src/Blocks/BlockFurnace.h b/src/Blocks/BlockFurnace.h
index a7a807957..74582c3b3 100644
--- a/src/Blocks/BlockFurnace.h
+++ b/src/Blocks/BlockFurnace.h
@@ -3,7 +3,7 @@
 
 #include "BlockEntity.h"
 #include "../World.h"
-#include "../Piston.h"
+#include "../Blocks/BlockPiston.h"
 #include "MetaRotator.h"
 
 
@@ -35,7 +35,7 @@ public:
 		a_BlockType = m_BlockType;
 		
 		// FIXME: Do not use cPiston class for furnace placement!
-		a_BlockMeta = cPiston::RotationPitchToMetaData(a_Player->GetYaw(), 0);
+		a_BlockMeta = cBlockPistonHandler::RotationPitchToMetaData(a_Player->GetYaw(), 0);
 		
 		return true;
 	}
diff --git a/src/Blocks/BlockMobHead.h b/src/Blocks/BlockMobHead.h
index b7629b07c..9855574ad 100644
--- a/src/Blocks/BlockMobHead.h
+++ b/src/Blocks/BlockMobHead.h
@@ -68,7 +68,7 @@ public:
 		public:
 			cPlayerCallback(const Vector3f & a_Pos) : m_Pos(a_Pos) {}
 
-		} PlayerCallback(Vector3f(a_BlockX, a_BlockY, a_BlockZ));
+		} PlayerCallback(Vector3f((float)a_BlockX, (float)a_BlockY, (float)a_BlockZ));
 
 		a_World->DoWithMobHeadAt(a_BlockX, a_BlockY, a_BlockZ, CallbackA);
 
diff --git a/src/Blocks/BlockPiston.cpp b/src/Blocks/BlockPiston.cpp
index 542eb33b5..faf639312 100644
--- a/src/Blocks/BlockPiston.cpp
+++ b/src/Blocks/BlockPiston.cpp
@@ -4,14 +4,14 @@
 #include "../Item.h"
 #include "../World.h"
 #include "../Entities/Player.h"
-#include "../Piston.h"
+#include "BlockInServerPluginInterface.h"
 
 
 
 
 
 #define AddPistonDir(x, y, z, dir, amount) \
-	switch (dir) \
+	switch (dir & 0x07) \
 	{ \
 		case 0: (y) -= (amount); break; \
 		case 1: (y) += (amount); break; \
@@ -19,8 +19,16 @@
 		case 3: (z) += (amount); break; \
 		case 4: (x) -= (amount); break; \
 		case 5: (x) += (amount); break; \
+		default: \
+		{ \
+			LOGWARNING("%s: invalid direction %d, ignoring", __FUNCTION__, dir & 0x07); \
+			break; \
+		} \
 	}
 
+#define PISTON_TICK_DELAY 1
+#define PISTON_MAX_PUSH_DISTANCE 12
+
 
 
 
@@ -40,7 +48,7 @@ void cBlockPistonHandler::OnDestroyed(cChunkInterface & a_ChunkInterface, cWorld
 	int newX = a_BlockX;
 	int newY = a_BlockY;
 	int newZ = a_BlockZ;
-	AddPistonDir(newX, newY, newZ, OldMeta & ~(8), 1);
+	AddPistonDir(newX, newY, newZ, OldMeta, 1);
 
 	if (a_ChunkInterface.GetBlock(newX, newY, newZ) == E_BLOCK_PISTON_EXTENSION)
 	{
@@ -60,7 +68,7 @@ bool cBlockPistonHandler::GetPlacementBlockTypeMeta(
 )
 {
 	a_BlockType = m_BlockType;
-	a_BlockMeta = cPiston::RotationPitchToMetaData(a_Player->GetYaw(), a_Player->GetPitch());
+	a_BlockMeta = RotationPitchToMetaData(a_Player->GetYaw(), a_Player->GetPitch());
 	return true;
 }
 
@@ -68,6 +76,165 @@ bool cBlockPistonHandler::GetPlacementBlockTypeMeta(
 
 
 
+int cBlockPistonHandler::FirstPassthroughBlock(int a_PistonX, int a_PistonY, int a_PistonZ, NIBBLETYPE pistonmeta, cWorld * a_World)
+{
+	// Examine each of the 12 blocks ahead of the piston:
+	for (int ret = 0; ret < PISTON_MAX_PUSH_DISTANCE; ret++)
+	{
+		BLOCKTYPE currBlock;
+		NIBBLETYPE currMeta;
+		AddPistonDir(a_PistonX, a_PistonY, a_PistonZ, pistonmeta, 1);
+		a_World->GetBlockTypeMeta(a_PistonX, a_PistonY, a_PistonZ, currBlock, currMeta);
+		if (CanBreakPush(currBlock))
+		{
+			// This block breaks when pushed, extend up to here
+			return ret;
+		}
+		if (!CanPush(currBlock, currMeta))
+		{
+			// This block cannot be pushed at all, the piston can't extend
+			return -1;
+		}
+	}
+	// There is no space for the blocks to move, piston can't extend
+	return -1;
+}
+
+
+
+
+
+void cBlockPistonHandler::ExtendPiston(int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World)
+{
+	BLOCKTYPE pistonBlock;
+	NIBBLETYPE pistonMeta;
+	a_World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, pistonBlock, pistonMeta);
+
+	if (IsExtended(pistonMeta))
+	{
+		// Already extended, bail out
+		return;
+	}
+
+	int dist = FirstPassthroughBlock(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, a_World);
+	if (dist < 0)
+	{
+		// FirstPassthroughBlock says piston can't push anything, bail out
+		return;
+	}
+
+	a_World->BroadcastBlockAction(a_BlockX, a_BlockY, a_BlockZ, 0, pistonMeta, pistonBlock);
+	a_World->BroadcastSoundEffect("tile.piston.out", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, 0.7f);
+
+	// Drop the breakable block in the line, if appropriate:
+	AddPistonDir(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, dist + 1);  // "a_Block" now at the breakable / empty block
+	BLOCKTYPE currBlock;
+	NIBBLETYPE currMeta;
+	a_World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, currBlock, currMeta);
+	if (currBlock != E_BLOCK_AIR)
+	{
+		cBlockHandler * Handler = BlockHandler(currBlock);
+		if (Handler->DoesDropOnUnsuitable())
+		{
+			cChunkInterface ChunkInterface(a_World->GetChunkMap());
+			cBlockInServerPluginInterface PluginInterface(*a_World);
+			Handler->DropBlock(ChunkInterface, *a_World, PluginInterface, NULL, a_BlockX, a_BlockY, a_BlockZ);
+		}
+	}
+
+	// Push blocks, from the furthest to the nearest:
+	int oldx = a_BlockX, oldy = a_BlockY, oldz = a_BlockZ;
+	NIBBLETYPE currBlockMeta;
+	std::vector<Vector3i> ScheduledBlocks;
+	ScheduledBlocks.reserve(PISTON_MAX_PUSH_DISTANCE);
+
+	for (int i = dist + 1; i > 1; i--)
+	{
+		AddPistonDir(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, -1);
+		a_World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, currBlock, currBlockMeta);
+		a_World->SetBlock(oldx, oldy, oldz, currBlock, currBlockMeta, false);
+		ScheduledBlocks.push_back(Vector3i(oldx, oldy, oldz));
+		oldx = a_BlockX;
+		oldy = a_BlockY;
+		oldz = a_BlockZ;
+	}
+
+	int extx = a_BlockX;
+	int exty = a_BlockY;
+	int extz = a_BlockZ;
+	ScheduledBlocks.push_back(Vector3i(extx, exty, extz));
+	AddPistonDir(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, -1);
+	// "a_Block" now at piston body, "ext" at future extension
+
+	a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, pistonBlock, pistonMeta | 0x8);
+	a_World->SetBlock(extx, exty, extz, E_BLOCK_PISTON_EXTENSION, pistonMeta | (IsSticky(pistonBlock) ? 8 : 0), false);
+	a_World->ScheduleTask(PISTON_TICK_DELAY, new cWorld::cTaskSendBlockToAllPlayers(ScheduledBlocks));
+}
+
+
+
+
+
+void cBlockPistonHandler::RetractPiston(int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World)
+{
+	BLOCKTYPE pistonBlock;
+	NIBBLETYPE pistonMeta;
+	a_World->GetBlockTypeMeta(a_BlockX, a_BlockY, a_BlockZ, pistonBlock, pistonMeta);
+
+	if (!IsExtended(pistonMeta))
+	{
+		// Already retracted, bail out
+		return;
+	}
+
+	// Check the extension:
+	AddPistonDir(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, 1);
+	if (a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ) != E_BLOCK_PISTON_EXTENSION)
+	{
+		LOGD("%s: Piston without an extension - still extending, or just in an invalid state?", __FUNCTION__);
+		return;
+	}
+
+	AddPistonDir(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, -1);
+	a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, pistonBlock, pistonMeta & ~(8));
+	a_World->BroadcastBlockAction(a_BlockX, a_BlockY, a_BlockZ, 1, pistonMeta & ~(8), pistonBlock);
+	a_World->BroadcastSoundEffect("tile.piston.in", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, 0.7f);
+	AddPistonDir(a_BlockX, a_BlockY, a_BlockZ, pistonMeta, 1);
+
+	// Retract the extension, pull block if appropriate
+	if (IsSticky(pistonBlock))
+	{
+		int tempx = a_BlockX, tempy = a_BlockY, tempz = a_BlockZ;
+		AddPistonDir(tempx, tempy, tempz, pistonMeta, 1);
+		BLOCKTYPE tempBlock;
+		NIBBLETYPE tempMeta;
+		a_World->GetBlockTypeMeta(tempx, tempy, tempz, tempBlock, tempMeta);
+		if (CanPull(tempBlock, tempMeta))
+		{
+			// Pull the block
+			a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, tempBlock, tempMeta, false);
+			a_World->SetBlock(tempx, tempy, tempz, E_BLOCK_AIR, 0, false);
+
+			std::vector<Vector3i> ScheduledBlocks;
+			ScheduledBlocks.push_back(Vector3i(a_BlockX, a_BlockY, a_BlockZ));
+			ScheduledBlocks.push_back(Vector3i(tempx, tempy, tempz));
+			a_World->ScheduleTask(PISTON_TICK_DELAY + 1, new cWorld::cTaskSendBlockToAllPlayers(ScheduledBlocks));
+			return;
+		}
+	}
+	
+	// Retract without pulling
+	a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_AIR, 0, false);
+
+	std::vector<Vector3i> ScheduledBlocks;
+	ScheduledBlocks.push_back(Vector3i(a_BlockX, a_BlockY, a_BlockZ));
+	a_World->ScheduleTask(PISTON_TICK_DELAY + 1, new cWorld::cTaskSendBlockToAllPlayers(ScheduledBlocks));
+}
+
+
+
+
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // cBlockPistonHeadHandler:
 
@@ -87,7 +254,7 @@ void cBlockPistonHeadHandler::OnDestroyedByPlayer(cChunkInterface & a_ChunkInter
 	int newX = a_BlockX;
 	int newY = a_BlockY;
 	int newZ = a_BlockZ;
-	AddPistonDir(newX, newY, newZ, OldMeta & ~(8), -1);
+	AddPistonDir(newX, newY, newZ, OldMeta, -1);
 
 	BLOCKTYPE Block = a_ChunkInterface.GetBlock(newX, newY, newZ);
 	if ((Block == E_BLOCK_STICKY_PISTON) || (Block == E_BLOCK_PISTON))
diff --git a/src/Blocks/BlockPiston.h b/src/Blocks/BlockPiston.h
index 7632b5e5a..e6fa48e54 100644
--- a/src/Blocks/BlockPiston.h
+++ b/src/Blocks/BlockPiston.h
@@ -21,6 +21,138 @@ public:
 		int a_CursorX, int a_CursorY, int a_CursorZ,
 		BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
 	) override;
+
+	static NIBBLETYPE RotationPitchToMetaData(double a_Rotation, double a_Pitch)
+	{
+		if (a_Pitch >= 50)
+		{
+			return 0x1;
+		}
+		else if (a_Pitch <= -50)
+		{
+			return 0x0;
+		}
+		else
+		{
+			a_Rotation += 90 + 45;  // So its not aligned with axis
+
+			if (a_Rotation > 360)
+			{
+				a_Rotation -= 360;
+			}
+			if ((a_Rotation >= 0) && (a_Rotation < 90))
+			{
+				return 0x4;
+			}
+			else if ((a_Rotation >= 180) && (a_Rotation < 270))
+			{
+				return 0x5;
+			}
+			else if ((a_Rotation >= 90) && (a_Rotation < 180))
+			{
+				return 0x2;
+			}
+			else
+			{
+				return 0x3;
+			}
+		}
+	}
+
+	static eBlockFace MetaDataToDirection(NIBBLETYPE a_MetaData)
+	{
+		switch (a_MetaData)
+		{
+			case 0x0: return BLOCK_FACE_YM;
+			case 0x1: return BLOCK_FACE_YP;
+			case 0x2: return BLOCK_FACE_ZM;
+			case 0x3: return BLOCK_FACE_ZP;
+			case 0x4: return BLOCK_FACE_XM;
+			case 0x5: return BLOCK_FACE_XP;
+			default:
+			{
+				ASSERT(!"Invalid Metadata");
+				return BLOCK_FACE_NONE;
+			}
+		}
+	}	
+
+	static void ExtendPiston(int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World);
+	static void RetractPiston(int a_BlockX, int a_BlockY, int a_BlockZ, cWorld * a_World);
+
+private:
+
+	/// Returns true if the piston (specified by blocktype) is a sticky piston
+	static inline bool IsSticky(BLOCKTYPE a_BlockType) { return (a_BlockType == E_BLOCK_STICKY_PISTON); }
+
+	/// Returns true if the piston (with the specified meta) is extended
+	static inline bool IsExtended(NIBBLETYPE a_PistonMeta) { return ((a_PistonMeta & 0x8) != 0x0); }
+
+	/// Returns true if the specified block can be pushed by a piston (and left intact)
+	static inline bool CanPush(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
+	{
+		switch (a_BlockType)
+		{
+			case E_BLOCK_ANVIL:
+			case E_BLOCK_BED:
+			case E_BLOCK_BEDROCK:
+			case E_BLOCK_BREWING_STAND:
+			case E_BLOCK_CHEST:
+			case E_BLOCK_COMMAND_BLOCK:
+			case E_BLOCK_DISPENSER:
+			case E_BLOCK_DROPPER:
+			case E_BLOCK_ENCHANTMENT_TABLE:
+			case E_BLOCK_END_PORTAL:
+			case E_BLOCK_END_PORTAL_FRAME:
+			case E_BLOCK_FURNACE:
+			case E_BLOCK_LIT_FURNACE:
+			case E_BLOCK_HOPPER:
+			case E_BLOCK_JUKEBOX:
+			case E_BLOCK_MOB_SPAWNER:
+			case E_BLOCK_NETHER_PORTAL:
+			case E_BLOCK_NOTE_BLOCK:
+			case E_BLOCK_OBSIDIAN:
+			case E_BLOCK_PISTON_EXTENSION:
+			{
+				return false;
+			}
+			case E_BLOCK_STICKY_PISTON:
+			case E_BLOCK_PISTON:
+			{
+				// A piston can only be pushed if retracted:
+				return !IsExtended(a_BlockMeta);
+			}
+		}
+		return true;
+	}
+
+	/// Returns true if the specified block can be pushed by a piston and broken / replaced
+	static inline bool CanBreakPush(BLOCKTYPE a_BlockType) { return cBlockInfo::IsPistonBreakable(a_BlockType); }
+
+	/// Returns true if the specified block can be pulled by a sticky piston
+	static inline bool CanPull(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
+	{
+		switch (a_BlockType)
+		{
+			case E_BLOCK_LAVA:
+			case E_BLOCK_STATIONARY_LAVA:
+			case E_BLOCK_STATIONARY_WATER:
+			case E_BLOCK_WATER:
+			{
+				return false;
+			}
+		}
+
+		if (CanBreakPush(a_BlockType))
+		{
+			return false; // CanBreakPush returns true, but we need false to prevent pulling
+		}
+		
+		return CanPush(a_BlockType, a_BlockMeta);
+	}
+
+	/// Returns how many blocks the piston has to push (where the first free space is); < 0 when unpushable
+	static int FirstPassthroughBlock(int a_PistonX, int a_PistonY, int a_PistonZ, NIBBLETYPE a_PistonMeta, cWorld * a_World);
 } ;
 
 
@@ -40,7 +172,7 @@ public:
 	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
 	{
 		// No pickups
-		// Also with 1.7, the item forms of these tecnical blocks have been removed, so giving someone this will crash their client...
+		// Also with 1.7, the item forms of these technical blocks have been removed, so giving someone this will crash their client...
 	}
 } ;