ItemSlab.h

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#pragma once
 
#include "ItemHandler.h"
 
 
 
 
 
class cItemSlabHandler final:
    public cItemHandler
{
    using Super = cItemHandler;
 
public:
 
    using Super::Super;
 
private:
 
    virtual bool CommitPlacement(cPlayer & a_Player, const cItem & a_HeldItem, const Vector3i a_PlacePosition, const eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition) const override
    {
        // Confer BlockSlab.h, which we're in cahoots with to make the below logic work.
 
        // If clicking a slab, combine it into a double-slab:
        if (cBlockSlabHandler::IsAnySlabType(a_Player.GetWorld()->GetBlock(a_PlacePosition)))
        {
            if (!a_Player.PlaceBlock(a_PlacePosition, GetDoubleSlabType(static_cast<BLOCKTYPE>(a_HeldItem.m_ItemType)), static_cast<NIBBLETYPE>(a_HeldItem.m_ItemDamage)))
            {
                return false;
            }
 
            a_Player.SendBlocksAround(a_PlacePosition, 2);  // (see below)
            return true;
        }
 
        // Set the correct metadata based on player equipped item:
        if (!a_Player.PlaceBlock(a_PlacePosition, static_cast<BLOCKTYPE>(a_HeldItem.m_ItemType), FaceToMetaData(static_cast<NIBBLETYPE>(a_HeldItem.m_ItemDamage), a_ClickedBlockFace, a_CursorPosition)))
        {
            return false;
        }
 
        /* This is a workaround for versions < 1.13, where the client combines a slab in the
        direction of the clicked block face of a block ignoring build collision, rather than replacing said block.
        Resend blocks to the client to fix the bug.
        Ref.: https://forum.cuberite.org/thread-434-post-17388.html#pid17388 */
        a_Player.SendBlocksAround(a_PlacePosition, 2);
 
        return true;
    }
 
 
    static NIBBLETYPE FaceToMetaData(const NIBBLETYPE a_BaseMeta, const eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition)
    {
        switch (a_ClickedBlockFace)
        {
            case BLOCK_FACE_TOP:
            {
                // Bottom half slab block:
                return a_BaseMeta & 0x07;
            }
            case BLOCK_FACE_BOTTOM:
            {
                // Top half slab block:
                return a_BaseMeta | 0x08;
            }
            case BLOCK_FACE_EAST:
            case BLOCK_FACE_NORTH:
            case BLOCK_FACE_SOUTH:
            case BLOCK_FACE_WEST:
            {
                if (a_CursorPosition.y > 7)
                {
                    // Cursor at top half of block, place top slab:
                    return a_BaseMeta | 0x08;
                }
                else
                {
                    // Cursor at bottom half of block, place bottom slab:
                    return a_BaseMeta & 0x07;
                }
            }
            default: UNREACHABLE("Unhandled block face");
        }
    }
 
 
    static BLOCKTYPE GetDoubleSlabType(BLOCKTYPE a_SingleSlabBlockType)
    {
        switch (a_SingleSlabBlockType)
        {
            case E_BLOCK_STONE_SLAB: return E_BLOCK_DOUBLE_STONE_SLAB;
            case E_BLOCK_WOODEN_SLAB: return E_BLOCK_DOUBLE_WOODEN_SLAB;
            case E_BLOCK_RED_SANDSTONE_SLAB: return E_BLOCK_DOUBLE_RED_SANDSTONE_SLAB;
            case E_BLOCK_PURPUR_SLAB: return E_BLOCK_PURPUR_DOUBLE_SLAB;
        }
        UNREACHABLE("Unhandled slab type");
    }
};