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// BlockFarmland.h
// Declares the cBlcokFarmlandHandler representing the block handler for farmland
#pragma once
#include "BlockHandler.h"
#include "ChunkInterface.h"
#include "../BlockArea.h"
#include "../Chunk.h"
#include "../ClientHandle.h"
class cBlockFarmlandHandler final : public cBlockHandler
{
using Super = cBlockHandler;
public:
using Super::Super;
/** Turns farmland into dirt.
Will first check for any colliding entities and teleport them to a higher position.
*/
static void TurnToDirt(cChunk & a_Chunk, Vector3i a_AbsPos)
{
auto RelPos = cChunkDef::AbsoluteToRelative(a_AbsPos);
TurnToDirt(a_Chunk, a_AbsPos, RelPos);
}
/** Turns farmland into dirt.
Will first check for any colliding entities and teleport them to a higher position.
*/
static void TurnToDirt(cChunk & a_Chunk, const Vector3i a_AbsPos, const Vector3i a_RelPos)
{
// Use cBlockInfo::GetBlockHeight when it doesn't break trampling for
// mobs and older clients anymore
static const auto FarmlandHeight = 0.9375;
static const auto FullHeightDelta = 0.0625;
a_Chunk.ForEachEntityInBox(
cBoundingBox(Vector3d(0.5, FarmlandHeight, 0.5) + a_AbsPos, 0.5, FullHeightDelta),
[&](cEntity & Entity)
{
const auto GroundHeight = a_AbsPos.y + 1;
// A simple IsOnGround isn't enough. It will return true when
// e.g. a piston pushes a farmland block into an entity's head.
// Maybe it's also possible than an entity is falling, it's
// still not on the ground, but it's less than 0.0625 blocks
// higher than the farmland block
if ((Entity.GetPosY() < a_AbsPos.y + FarmlandHeight) || (Entity.GetPosY() >= GroundHeight))
{
return false;
}
// Players need a packet that will update their position
if (Entity.IsPlayer())
{
const auto HeightIncrease = GroundHeight - Entity.GetPosY();
const auto Player = static_cast<const cPlayer *>(&Entity);
Player->GetClientHandle()->SendPlayerMoveLook(Vector3d(0.0, HeightIncrease, 0.0), 0.0f, 0.0f, true);
}
Entity.SetPosY(GroundHeight);
return false;
}
);
a_Chunk.SetBlock(a_RelPos, E_BLOCK_DIRT, 0);
}
private:
virtual cItems ConvertToPickups(const NIBBLETYPE a_BlockMeta, const cItem * const a_Tool) const override
{
return cItem(E_BLOCK_DIRT, 1, 0);
}
virtual void OnUpdate(
cChunkInterface & a_ChunkInterface,
cWorldInterface & a_WorldInterface,
cBlockPluginInterface & a_PluginInterface,
cChunk & a_Chunk,
const Vector3i a_RelPos
) const override
{
auto BlockMeta = a_Chunk.GetMeta(a_RelPos);
if (IsWaterInNear(a_Chunk, a_RelPos))
{
// Water was found, set block meta to 7
a_Chunk.FastSetBlock(a_RelPos, m_BlockType, 7);
return;
}
// Water wasn't found, de-hydrate block:
if (BlockMeta > 0)
{
a_Chunk.FastSetBlock(a_RelPos, E_BLOCK_FARMLAND, --BlockMeta);
return;
}
// Farmland too dry. If nothing is growing on top, turn back to dirt:
auto UpperBlock =
cChunkDef::IsValidHeight(a_RelPos.addedY(1)) ? a_Chunk.GetBlock(a_RelPos.addedY(1)) : E_BLOCK_AIR;
switch (UpperBlock)
{
case E_BLOCK_BEETROOTS:
case E_BLOCK_CROPS:
case E_BLOCK_POTATOES:
case E_BLOCK_CARROTS:
case E_BLOCK_MELON_STEM:
case E_BLOCK_PUMPKIN_STEM:
{
// Produce on top, don't revert
break;
}
default:
{
auto AbsPos = a_Chunk.RelativeToAbsolute(a_RelPos);
TurnToDirt(a_Chunk, AbsPos, a_RelPos);
break;
}
}
}
virtual void OnNeighborChanged(cChunkInterface & a_ChunkInterface, Vector3i a_BlockPos, eBlockFace a_WhichNeighbor)
const override
{
// Don't care about any neighbor but the one above us (fix recursion loop in #2213):
if (a_WhichNeighbor != BLOCK_FACE_YP)
{
return;
}
// Don't care about anything if we're at the top of the world:
if (a_BlockPos.y >= cChunkDef::Height)
{
return;
}
// Check whether we should revert to dirt:
// TODO: fix for signs and slabs (possibly more blocks) - they should destroy farmland
auto upperBlock = a_ChunkInterface.GetBlock(a_BlockPos.addedY(1));
if (cBlockInfo::FullyOccupiesVoxel(upperBlock))
{
// Until the fix above is done, this line should also suffice:
// a_ChunkInterface.SetBlock(a_BlockPos, E_BLOCK_DIRT, 0);
a_ChunkInterface.DoWithChunkAt(
a_BlockPos,
[&](cChunk & Chunk)
{
TurnToDirt(Chunk, a_BlockPos);
return true;
}
);
}
}
/** Returns true if there's either a water source block close enough to hydrate the specified position, or it's
* raining there. */
static bool IsWaterInNear(const cChunk & a_Chunk, const Vector3i a_RelPos)
{
if (a_Chunk.IsWeatherWetAt(a_RelPos.addedY(1)))
{
// Rain hydrates farmland, too
return true;
}
const auto WorldPos = a_Chunk.RelativeToAbsolute(a_RelPos);
// Search for water in a close proximity:
// Ref.: https://minecraft.wiki/w/Farmland#Hydration
// TODO: Rewrite this to use the chunk and its neighbors directly
cBlockArea Area;
if (!Area.Read(*a_Chunk.GetWorld(), WorldPos - Vector3i(4, 0, 4), WorldPos + Vector3i(4, 1, 4)))
{
// Too close to the world edge, cannot check surroundings
return false;
}
size_t NumBlocks = Area.GetBlockCount();
BLOCKTYPE * BlockTypes = Area.GetBlockTypes();
for (size_t i = 0; i < NumBlocks; i++)
{
if (IsBlockWater(BlockTypes[i]))
{
return true;
}
} // for i - BlockTypes[]
return false;
}
virtual bool CanSustainPlant(BLOCKTYPE a_Plant) const override
{
return (
(a_Plant == E_BLOCK_BEETROOTS) || (a_Plant == E_BLOCK_CROPS) || (a_Plant == E_BLOCK_CARROTS) ||
(a_Plant == E_BLOCK_POTATOES) || (a_Plant == E_BLOCK_MELON_STEM) || (a_Plant == E_BLOCK_PUMPKIN_STEM)
);
}
};
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