164 lines
3.5 KiB
C++
164 lines
3.5 KiB
C++
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// BlockFarmland.h
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// Declares the cBlcokFarmlandHandler representing the block handler for farmland
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#pragma once
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#include "BlockHandler.h"
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#include "../BlockArea.h"
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class cBlockFarmlandHandler :
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public cBlockHandler
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{
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using Super = cBlockHandler;
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public:
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using Super::Super;
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private:
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virtual cItems ConvertToPickups(NIBBLETYPE a_BlockMeta, cBlockEntity * a_BlockEntity, const cEntity * a_Digger, const cItem * a_Tool) const override
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{
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return cItem(E_BLOCK_DIRT, 1, 0);
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}
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virtual void OnUpdate(
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cChunkInterface & a_ChunkInterface,
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cWorldInterface & a_WorldInterface,
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cBlockPluginInterface & a_PluginInterface,
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cChunk & a_Chunk,
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const Vector3i a_RelPos
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) const override
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{
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auto BlockMeta = a_Chunk.GetMeta(a_RelPos);
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if (IsWaterInNear(a_Chunk, a_RelPos))
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{
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// Water was found, set block meta to 7
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a_Chunk.FastSetBlock(a_RelPos, m_BlockType, 7);
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return;
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}
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// Water wasn't found, de-hydrate block:
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if (BlockMeta > 0)
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{
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a_Chunk.FastSetBlock(a_RelPos, E_BLOCK_FARMLAND, --BlockMeta);
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return;
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}
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// Farmland too dry. If nothing is growing on top, turn back to dirt:
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auto UpperBlock = cChunkDef::IsValidHeight(a_RelPos.y + 1) ? a_Chunk.GetBlock(a_RelPos.addedY(1)) : E_BLOCK_AIR;
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switch (UpperBlock)
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{
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case E_BLOCK_BEETROOTS:
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case E_BLOCK_CROPS:
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case E_BLOCK_POTATOES:
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case E_BLOCK_CARROTS:
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case E_BLOCK_MELON_STEM:
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case E_BLOCK_PUMPKIN_STEM:
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{
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// Produce on top, don't revert
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break;
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}
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default:
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{
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a_Chunk.SetBlock(a_RelPos, E_BLOCK_DIRT, 0);
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break;
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}
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}
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}
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virtual void OnNeighborChanged(cChunkInterface & a_ChunkInterface, Vector3i a_BlockPos, eBlockFace a_WhichNeighbor) const override
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{
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// Don't care about any neighbor but the one above us (fix recursion loop in #2213):
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if (a_WhichNeighbor != BLOCK_FACE_YP)
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{
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return;
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}
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// Don't care about anything if we're at the top of the world:
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if (a_BlockPos.y >= cChunkDef::Height)
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{
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return;
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}
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// Check whether we should revert to dirt:
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auto upperBlock = a_ChunkInterface.GetBlock(a_BlockPos.addedY(1));
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if (cBlockInfo::FullyOccupiesVoxel(upperBlock))
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{
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a_ChunkInterface.SetBlock(a_BlockPos, E_BLOCK_DIRT, 0);
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}
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}
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/** Returns true if there's either a water source block close enough to hydrate the specified position, or it's raining there. */
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static bool IsWaterInNear(const cChunk & a_Chunk, const Vector3i a_RelPos)
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{
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const auto WorldPos = a_Chunk.RelativeToAbsolute(a_RelPos);
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if (a_Chunk.GetWorld()->IsWeatherWetAtXYZ(WorldPos))
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{
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// Rain hydrates farmland, too
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return true;
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}
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// Search for water in a close proximity:
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// Ref.: https://minecraft.gamepedia.com/Farmland#Hydration
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// TODO: Rewrite this to use the chunk and its neighbors directly
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cBlockArea Area;
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if (!Area.Read(*a_Chunk.GetWorld(), WorldPos - Vector3i(4, 0, 4), WorldPos + Vector3i(4, 1, 4)))
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{
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// Too close to the world edge, cannot check surroundings
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return false;
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}
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size_t NumBlocks = Area.GetBlockCount();
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BLOCKTYPE * BlockTypes = Area.GetBlockTypes();
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for (size_t i = 0; i < NumBlocks; i++)
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{
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if (IsBlockWater(BlockTypes[i]))
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{
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return true;
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}
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} // for i - BlockTypes[]
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return false;
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}
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virtual bool CanSustainPlant(BLOCKTYPE a_Plant) const override
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{
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return (
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(a_Plant == E_BLOCK_BEETROOTS) ||
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(a_Plant == E_BLOCK_CROPS) ||
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(a_Plant == E_BLOCK_CARROTS) ||
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(a_Plant == E_BLOCK_POTATOES) ||
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(a_Plant == E_BLOCK_MELON_STEM) ||
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(a_Plant == E_BLOCK_PUMPKIN_STEM)
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);
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}
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} ;
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