6 files changed, 37 insertions, 4 deletions
diff --git a/src/Blocks/BlockBed.h b/src/Blocks/BlockBed.h
index 92804aaac..cfd732d38 100644
--- a/src/Blocks/BlockBed.h
+++ b/src/Blocks/BlockBed.h
@@ -39,6 +39,13 @@ public:
 	}
 
 
+	virtual bool CanChangeDirtToGrass(BLOCKTYPE a_Block, NIBBLETYPE a_Meta) override
+	{
+		return true;
+	}
+
+
+
 	// Bed specific helper functions
 	static NIBBLETYPE RotationToMetaData(double a_Rotation)
 	{
diff --git a/src/Blocks/BlockDirt.h b/src/Blocks/BlockDirt.h
index aa24b8668..84c8461b5 100644
--- a/src/Blocks/BlockDirt.h
+++ b/src/Blocks/BlockDirt.h
@@ -2,6 +2,7 @@
 #pragma once
 
 #include "BlockHandler.h"
+#include "BlockSlab.h"
 #include "../FastRandom.h"
 
 
@@ -35,8 +36,10 @@ public:
 		// Grass becomes dirt if there is something on top of it:
 		if (a_RelY < cChunkDef::Height - 1)
 		{
-			BLOCKTYPE Above = a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ);
-			if ((!cBlockInfo::IsTransparent(Above) && !cBlockInfo::IsOneHitDig(Above)) || IsBlockWater(Above))
+			BLOCKTYPE Above;
+			NIBBLETYPE AboveMeta;
+			a_Chunk.GetBlockTypeMeta(a_RelX, a_RelY + 1, a_RelZ, Above, AboveMeta);
+			if ((IsBlockWater(Above)) || !cBlockInfo::GetHandler(Above)->CanChangeDirtToGrass(Above, AboveMeta))
 			{
 				a_Chunk.FastSetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_DIRT, E_META_DIRT_NORMAL);
 				return;
@@ -64,7 +67,7 @@ public:
 			cChunk * Chunk = a_Chunk.GetRelNeighborChunkAdjustCoords(BlockX, BlockZ);
 			if (Chunk == NULL)
 			{
-				// Unloaded chunk
+				// Unloaded chunks
 				continue;
 			}
 			Chunk->GetBlockTypeMeta(BlockX, BlockY, BlockZ, DestBlock, DestMeta);
@@ -77,7 +80,7 @@ public:
 			BLOCKTYPE AboveDest;
 			NIBBLETYPE AboveMeta;
 			Chunk->GetBlockTypeMeta(BlockX, BlockY + 1, BlockZ, AboveDest, AboveMeta);
-			if ((cBlockInfo::IsOneHitDig(AboveDest) || cBlockInfo::IsTransparent(AboveDest)) && !IsBlockWater(AboveDest))
+			if ((!IsBlockWater(AboveDest)) && (cBlockInfo::GetHandler(AboveDest)->CanChangeDirtToGrass(AboveDest, AboveMeta)))
 			{
 				if (!cRoot::Get()->GetPluginManager()->CallHookBlockSpread((cWorld*) &a_WorldInterface, BlockX * cChunkDef::Width, BlockY, BlockZ * cChunkDef::Width, ssGrassSpread))
 				{
diff --git a/src/Blocks/BlockHandler.cpp b/src/Blocks/BlockHandler.cpp
index 4a29ff628..344f056a1 100644
--- a/src/Blocks/BlockHandler.cpp
+++ b/src/Blocks/BlockHandler.cpp
@@ -398,6 +398,15 @@ bool cBlockHandler::CanBeAt(cChunkInterface & a_ChunkInterface, int a_BlockX, in
 
 
 
+bool cBlockHandler::CanChangeDirtToGrass(BLOCKTYPE a_Block, NIBBLETYPE a_Meta)
+{
+	return ((cBlockInfo::IsTransparent(a_Block)) || (cBlockInfo::IsOneHitDig(a_Block)));
+}
+
+
+
+
+
 bool cBlockHandler::IsUseable()
 {
 	return false;
diff --git a/src/Blocks/BlockHandler.h b/src/Blocks/BlockHandler.h
index 3a3efb3cc..760db02fe 100644
--- a/src/Blocks/BlockHandler.h
+++ b/src/Blocks/BlockHandler.h
@@ -85,6 +85,9 @@ public:
 	
 	/// Checks if the block can stay at the specified relative coords in the chunk
 	virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, int a_RelX, int a_RelY, int a_RelZ, const cChunk & a_Chunk);
+
+	/** Can spread the block under this block to grass? */
+	virtual bool CanChangeDirtToGrass(BLOCKTYPE a_Block, NIBBLETYPE a_Meta);
 	
 	/** Checks if the block can be placed at this point.
 	Default: CanBeAt(...) 
diff --git a/src/Blocks/BlockSlab.h b/src/Blocks/BlockSlab.h
index 76f5ed0e7..84580b062 100644
--- a/src/Blocks/BlockSlab.h
+++ b/src/Blocks/BlockSlab.h
@@ -97,6 +97,12 @@ public:
 		return "";
 	}
 
+
+	virtual bool CanChangeDirtToGrass(BLOCKTYPE a_Block, NIBBLETYPE a_Meta) override
+	{
+		return (a_Meta & 0x8);
+	}
+
 	
 	/// Returns true if the specified blocktype is one of the slabs handled by this handler
 	static bool IsAnySlabType(BLOCKTYPE a_BlockType)
diff --git a/src/Blocks/BlockStairs.h b/src/Blocks/BlockStairs.h
index 09ff254a6..d6363fed9 100644
--- a/src/Blocks/BlockStairs.h
+++ b/src/Blocks/BlockStairs.h
@@ -77,6 +77,11 @@ public:
 		// Reset meta to 0
 		a_Pickups.push_back(cItem(m_BlockType, 1, 0));
 	}
+
+	virtual bool CanChangeDirtToGrass(BLOCKTYPE a_Block, NIBBLETYPE a_Meta) override
+	{
+		return true;
+	}
 	
 	static NIBBLETYPE RotationToMetaData(double a_Rotation)
 	{