BlockDirt.h

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#pragma once

#include "BlockHandler.h"
#include "../FastRandom.h"
#include "../Root.h"
#include "../Bindings/PluginManager.h"





class cBlockDirtHandler :
    public cBlockHandler
{
    using super = cBlockHandler;

public:

    cBlockDirtHandler(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 (a_BlockMeta == E_META_DIRT_COARSE)
        {
            // Drop the coarse block (dirt, meta 1)
            return cItem(E_BLOCK_DIRT, 1, E_META_DIRT_COARSE);
        }
        else
        {
            return cItem(E_BLOCK_DIRT, 1, E_META_DIRT_NORMAL);
        }
    }





    virtual void OnUpdate(cChunkInterface & cChunkInterface, cWorldInterface & a_WorldInterface, cBlockPluginInterface & a_PluginInterface, cChunk & a_Chunk, int a_RelX, int a_RelY, int a_RelZ) override
    {
        if (m_BlockType != E_BLOCK_GRASS)
        {
            return;
        }

        // 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);
        switch (m_BlockType)
        {
            case E_BLOCK_DIRT: return 10;
            case E_BLOCK_GRASS: return 1;
            default:
            {
                ASSERT(!"Unhandled blocktype in dirt handler!");
                return 0;
            }
        }
    }
} ;