From 0718c44e778aa7295125b5cbd684aeb646eb4067 Mon Sep 17 00:00:00 2001
From: Mat <mail@mathias.is>
Date: Tue, 17 Mar 2020 02:23:50 +0200
Subject: Silk touch pickaxe drops grass block (#4485)

---
 src/Blocks/BlockGrass.h | 131 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/Blocks/BlockGrass.h

(limited to 'src/Blocks/BlockGrass.h')

diff --git a/src/Blocks/BlockGrass.h b/src/Blocks/BlockGrass.h
new file mode 100644
index 000000000..0e54cb092
--- /dev/null
+++ b/src/Blocks/BlockGrass.h
@@ -0,0 +1,131 @@
+
+#pragma once
+
+#include "BlockHandler.h"
+#include "../FastRandom.h"
+#include "../Root.h"
+#include "../Bindings/PluginManager.h"
+
+
+
+
+
+class cBlockGrassHandler :
+	public cBlockHandler
+{
+	using super = cBlockHandler;
+
+public:
+
+	cBlockGrassHandler(BLOCKTYPE a_BlockType):
+		super(a_BlockType)
+	{
+	}
+
+
+
+
+
+	virtual cItems ConvertToPickups(NIBBLETYPE a_BlockMeta, cBlockEntity * a_BlockEntity, const cEntity * a_Digger, const cItem * a_Tool) override
+	{
+		if (!ToolHasSilkTouch(a_Tool))
+		{
+			return cItem(E_BLOCK_DIRT, 1, 0);
+		}
+		return cItem(E_BLOCK_GRASS, 1, 0);
+	}
+
+
+
+
+
+	virtual void OnUpdate(cChunkInterface & cChunkInterface, cWorldInterface & a_WorldInterface, cBlockPluginInterface & a_PluginInterface, cChunk & a_Chunk, int a_RelX, int a_RelY, int a_RelZ) override
+	{
+		// Make sure that there is enough light at the source block to spread
+		if (!a_Chunk.GetWorld()->IsChunkLighted(a_Chunk.GetPosX(), a_Chunk.GetPosZ()))
+		{
+			a_Chunk.GetWorld()->QueueLightChunk(a_Chunk.GetPosX(), a_Chunk.GetPosZ());
+			return;
+		}
+		else if ((a_RelY < cChunkDef::Height - 1))
+		{
+			BLOCKTYPE above = a_Chunk.GetBlock(a_RelX, a_RelY + 1, a_RelZ);
+
+			// Grass turns back to dirt when the block above it is not transparent or water.
+			// It does not turn to dirt when a snow layer is above.
+			if ((above != E_BLOCK_SNOW) &&
+				(!cBlockInfo::IsTransparent(above) || IsBlockWater(above)))
+			{
+				a_Chunk.FastSetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_DIRT, E_META_DIRT_NORMAL);
+				return;
+			}
+
+			NIBBLETYPE light = std::max(a_Chunk.GetBlockLight(a_RelX, a_RelY + 1, a_RelZ), a_Chunk.GetTimeAlteredLight(a_Chunk.GetSkyLight(a_RelX, a_RelY + 1, a_RelZ)));
+			// Source block is not bright enough to spread
+			if (light < 9)
+			{
+				return;
+			}
+
+		}
+
+		// Grass spreads to adjacent dirt blocks:
+		auto & rand = GetRandomProvider();
+		for (int i = 0; i < 2; i++)  // Pick two blocks to grow to
+		{
+			int OfsX = rand.RandInt(-1, 1);
+			int OfsY = rand.RandInt(-3, 1);
+			int OfsZ = rand.RandInt(-1, 1);
+
+			BLOCKTYPE  DestBlock;
+			NIBBLETYPE DestMeta;
+			if (!cChunkDef::IsValidHeight(a_RelY + OfsY))
+			{
+				// Y Coord out of range
+				continue;
+			}
+			Vector3i pos(a_RelX + OfsX, a_RelY + OfsY, a_RelZ + OfsZ);
+			auto chunk = a_Chunk.GetRelNeighborChunkAdjustCoords(pos);
+			if (chunk == nullptr)
+			{
+				// Unloaded chunk
+				continue;
+			}
+			chunk->GetBlockTypeMeta(pos, DestBlock, DestMeta);
+			if ((DestBlock != E_BLOCK_DIRT) || (DestMeta != E_META_DIRT_NORMAL))
+			{
+				// Not a regular dirt block
+				continue;
+			}
+			auto abovePos = pos.addedY(1);
+			BLOCKTYPE above = chunk->GetBlock(abovePos);
+			NIBBLETYPE light = std::max(chunk->GetBlockLight(abovePos), chunk->GetTimeAlteredLight(chunk->GetSkyLight(abovePos)));
+			if ((light > 4)  &&
+				cBlockInfo::IsTransparent(above) &&
+				(!IsBlockLava(above)) &&
+				(!IsBlockWaterOrIce(above))
+			)
+			{
+				auto absPos = chunk->RelativeToAbsolute(pos);
+				if (!cRoot::Get()->GetPluginManager()->CallHookBlockSpread(*chunk->GetWorld(), absPos.x, absPos.y, absPos.z, ssGrassSpread))
+				{
+					chunk->FastSetBlock(pos, E_BLOCK_GRASS, 0);
+				}
+			}
+		}  // for i - repeat twice
+	}
+
+
+
+
+
+	virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) override
+	{
+		UNUSED(a_Meta);
+		return 1;
+	}
+} ;
+
+
+
+
-- 
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