1 files changed, 72 insertions, 0 deletions
diff --git a/source/Blocks/BlockDirt.h b/source/Blocks/BlockDirt.h
new file mode 100644
index 000000000..5a2487f1b
--- /dev/null
+++ b/source/Blocks/BlockDirt.h
@@ -0,0 +1,72 @@
+#pragma once
+#include "BlockHandler.h"
+#include "../MersenneTwister.h"
+#include "../World.h"
+
+class cBlockDirtHandler : public cBlockHandler
+{
+public:
+	cBlockDirtHandler(BLOCKTYPE a_BlockID)
+		: cBlockHandler(a_BlockID)
+	{
+	}
+
+	
+	virtual bool NeedsRandomTicks() override
+	{
+		return m_BlockID == E_BLOCK_GRASS;
+	}
+
+	virtual int GetDropID() override
+	{
+		return E_BLOCK_DIRT;
+	}
+	
+	
+	void OnUpdate(cWorld *a_World, int a_X, int a_Y, int a_Z) override
+	{
+		if (m_BlockID != E_BLOCK_GRASS)
+		{
+			return;
+		}
+		
+		// Grass becomes dirt if there is something on top of it:
+		BLOCKTYPE Above = a_World->GetBlock(a_X, a_Y + 1, a_Z);
+		if (!g_BlockTransparent[Above] && !g_BlockOneHitDig[Above])
+		{
+			a_World->FastSetBlock(a_X, a_Y, a_Z, 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;
+			a_World->GetBlockTypeMeta(a_X + OfsX, a_Y + OfsY, a_Z + OfsZ, DestBlock, DestMeta);
+			if(DestBlock != E_BLOCK_DIRT)
+			{
+				continue;
+			}
+
+			BLOCKTYPE AboveDest;
+			NIBBLETYPE AboveMeta;
+			a_World->GetBlockTypeMeta(a_X + OfsX, a_Y + OfsY + 1, a_Z + OfsZ, AboveDest, AboveMeta);
+			if (g_BlockOneHitDig[AboveDest] || g_BlockTransparent[AboveDest])
+			{
+				a_World->FastSetBlock(a_X + OfsX, a_Y + OfsY, a_Z + OfsZ, E_BLOCK_GRASS, 0);
+			}
+		}  // for i - repeat twice
+	}
+
+	virtual AString GetStepSound(void) override
+	{
+		return "step.gravel";
+	}
+	
+};