1 files changed, 88 insertions, 0 deletions
diff --git a/src/Blocks/BlockDirt.h b/src/Blocks/BlockDirt.h
new file mode 100644
index 000000000..c694d79f6
--- /dev/null
+++ b/src/Blocks/BlockDirt.h
@@ -0,0 +1,88 @@
+
+#pragma once
+
+#include "BlockHandler.h"
+#include "../MersenneTwister.h"
+#include "../World.h"
+
+
+
+
+
+/// Handler used for both dirt and grass
+class cBlockDirtHandler :
+	public cBlockHandler
+{
+public:
+	cBlockDirtHandler(BLOCKTYPE a_BlockType)
+		: cBlockHandler(a_BlockType)
+	{
+	}
+
+	
+	virtual void ConvertToPickups(cItems & a_Pickups, NIBBLETYPE a_BlockMeta) override
+	{
+		a_Pickups.push_back(cItem(E_BLOCK_DIRT, 1, 0));
+	}
+	
+	
+	virtual void OnUpdate(cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ) override
+	{
+		if (m_BlockType != E_BLOCK_GRASS)
+		{
+			return;
+		}
+		
+		// Grass becomes dirt if there is something on top of it:
+		if (a_BlockY < cChunkDef::Height - 1)
+		{
+			BLOCKTYPE Above = a_World->GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ);
+			if ((!g_BlockTransparent[Above] && !g_BlockOneHitDig[Above]) || IsBlockWater(Above))
+			{
+				a_World->FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_DIRT, 0);
+				return;
+			}
+		}
+		
+		// Grass spreads to adjacent blocks:
+		MTRand rand;
+		for (int i = 0; i < 2; i++)  // Pick two blocks to grow to
+		{
+			int OfsX = rand.randInt(2) - 1;  // [-1 .. 1]
+			int OfsY = rand.randInt(4) - 3;  // [-3 .. 1]
+			int OfsZ = rand.randInt(2) - 1;  // [-1 .. 1]
+	
+			BLOCKTYPE  DestBlock;
+			NIBBLETYPE DestMeta;
+			if ((a_BlockY + OfsY < 0) || (a_BlockY + OfsY >= cChunkDef::Height - 1))
+			{
+				// Y Coord out of range
+				continue;
+			}
+			bool IsValid = a_World->GetBlockTypeMeta(a_BlockX + OfsX, a_BlockY + OfsY, a_BlockZ + OfsZ, DestBlock, DestMeta);
+			if (!IsValid || (DestBlock != E_BLOCK_DIRT))
+			{
+				continue;
+			}
+
+			BLOCKTYPE AboveDest;
+			NIBBLETYPE AboveMeta;
+			IsValid = a_World->GetBlockTypeMeta(a_BlockX + OfsX, a_BlockY + OfsY + 1, a_BlockZ + OfsZ, AboveDest, AboveMeta);
+			ASSERT(IsValid);  // WTF - how did we get the DestBlock if AboveBlock is not valid?
+			if ((g_BlockOneHitDig[AboveDest] || g_BlockTransparent[AboveDest]) && !IsBlockWater(AboveDest))
+			{
+				a_World->FastSetBlock(a_BlockX + OfsX, a_BlockY + OfsY, a_BlockZ + OfsZ, E_BLOCK_GRASS, 0);
+			}
+		}  // for i - repeat twice
+	}
+
+
+	virtual const char * GetStepSound(void) override
+	{
+		return "step.gravel";
+	}
+} ;
+
+
+
+