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cuberite-2a/src/Blocks/BlockHopper.h

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// BlockHopper.h
// Declares the cBlockHopperHandler class representing the handler for the Hopper block
#include "MetaRotator.h"
class cBlockHopperHandler :
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public cMetaRotator<cBlockEntityHandler, 0x07, 0x02, 0x05, 0x03, 0x04>
{
public:
cBlockHopperHandler(BLOCKTYPE a_BlockType)
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: cMetaRotator<cBlockEntityHandler, 0x07, 0x02, 0x05, 0x03, 0x04>(a_BlockType)
{
}
virtual bool GetPlacementBlockTypeMeta(
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cChunkInterface & a_ChunkInterface, cPlayer * a_Player,
int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace,
int a_CursorX, int a_CursorY, int a_CursorZ,
BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta
) override
{
a_BlockType = m_BlockType;
// Convert the blockface into meta:
switch (a_BlockFace)
{
case BLOCK_FACE_BOTTOM: a_BlockMeta = E_META_HOPPER_FACING_YM; break;
case BLOCK_FACE_TOP: a_BlockMeta = E_META_HOPPER_FACING_YM; break;
case BLOCK_FACE_EAST: a_BlockMeta = E_META_HOPPER_FACING_XM; break;
case BLOCK_FACE_NORTH: a_BlockMeta = E_META_HOPPER_FACING_ZP; break;
case BLOCK_FACE_SOUTH: a_BlockMeta = E_META_HOPPER_FACING_ZM; break;
case BLOCK_FACE_WEST: a_BlockMeta = E_META_HOPPER_FACING_XP; break;
default: a_BlockMeta = E_META_HOPPER_UNATTACHED; break;
}
return true;
}
virtual NIBBLETYPE MetaMirrorXZ(NIBBLETYPE a_Meta) override
{
// Bit 0x08 is a flag. Lowest three bits are position. 0x08 == 1000
NIBBLETYPE OtherMeta = a_Meta & 0x08;
// Mirrors defined by by a table. (Source, mincraft.gamepedia.com) 0x07 == 0111
switch (a_Meta & 0x07)
{
case 0x00: return 0x01 + OtherMeta; // Down -> Up
case 0x01: return 0x00 + OtherMeta; // Up -> Down
}
// Not Facing Up or Down; No change.
return a_Meta;
}
} ;