67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
#pragma once
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#include "Block.h"
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#include "../MersenneTwister.h"
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#include "../cWorld.h"
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class cBlockDirtHandler : public cBlockHandler
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{
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public:
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cBlockDirtHandler(BLOCKTYPE a_BlockID)
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: cBlockHandler(a_BlockID)
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{
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}
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virtual bool NeedsRandomTicks() override
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{
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return m_BlockID == E_BLOCK_GRASS;
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}
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virtual int GetDropID() override
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{
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return E_BLOCK_DIRT;
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}
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void OnUpdate(cWorld *a_World, int a_X, int a_Y, int a_Z) override
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{
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if (m_BlockID != E_BLOCK_GRASS)
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{
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return;
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}
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// Grass becomes dirt if there is something on top of it:
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BLOCKTYPE Above = a_World->GetBlock(a_X, a_Y + 1, a_Z);
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if (!g_BlockTransparent[Above] && !g_BlockOneHitDig[Above])
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{
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a_World->FastSetBlock(a_X, a_Y, a_Z, E_BLOCK_DIRT, 0);
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return;
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}
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// Grass spreads to adjacent blocks:
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MTRand rand;
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for (int i = 0; i < 2; i++) // Pick two blocks to grow to
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{
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int OfsX = rand.randInt(2) - 1; // [-1 .. 1]
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int OfsY = rand.randInt(4) - 3; // [-3 .. 1]
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int OfsZ = rand.randInt(2) - 1; // [-1 .. 1]
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BLOCKTYPE DestBlock;
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NIBBLETYPE DestMeta;
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a_World->GetBlockTypeMeta(a_X + OfsX, a_Y + OfsY, a_Z + OfsZ, DestBlock, DestMeta);
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if(DestBlock != E_BLOCK_DIRT)
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{
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continue;
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}
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BLOCKTYPE AboveDest;
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NIBBLETYPE AboveMeta;
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a_World->GetBlockTypeMeta(a_X + OfsX, a_Y + OfsY + 1, a_Z + OfsZ, AboveDest, AboveMeta);
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if (g_BlockOneHitDig[AboveDest] || g_BlockTransparent[AboveDest])
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{
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a_World->FastSetBlock(a_X + OfsX, a_Y + OfsY, a_Z + OfsZ, E_BLOCK_GRASS, 0);
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}
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} // for i - repeat twice
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}
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}; |