summaryrefslogtreecommitdiffstats
path: root/src/Blocks/BlockStems.h
blob: fa80d41277a7c417ba66ae982dbe559a9f417371 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210

#pragma once

#include "BlockPlant.h"





/** Handler for stems from which produce grows in an adjacent block (melon, pumpkin) after it becomes ripe (meta == 7).
ProduceBlockType is the blocktype for the produce to be grown.
StemPickupType is the item type for the pickup resulting from breaking the stem. */
template <BLOCKTYPE ProduceBlockType, ENUM_ITEM_TYPE StemPickupType>
class cBlockStemsHandler final :
	public cBlockPlant<true>
{
	using Super = cBlockPlant<true>;

public:

	using Super::Super;

private:

	virtual cItems ConvertToPickups(NIBBLETYPE a_BlockMeta, const cEntity * a_Digger, const cItem * a_Tool) const override
	{
		/*
			Use correct percent:
			https://minecraft.gamepedia.com/Melon_Seeds#Breaking
			https://minecraft.gamepedia.com/Pumpkin_Seeds#Breaking
		*/

		// Age > 7 (Impossible)
		if (a_BlockMeta > 7)
		{
			return cItem(StemPickupType);
		}

		const auto Threshold = GetRandomProvider().RandReal<double>(100);
		double Cumulative = 0;
		char Count = 0;

		for (; Count < 4; Count++)
		{
			Cumulative += m_AgeSeedDropProbability[static_cast<size_t>(a_BlockMeta)][static_cast<size_t>(Count)];
			if (Cumulative > Threshold)
			{
				break;
			}
		}

		return cItem(StemPickupType, Count);
	}





	virtual bool CanBeAt(cChunkInterface & a_ChunkInterface, const Vector3i a_RelPos, const cChunk & a_Chunk) const override
	{
		return ((a_RelPos.y > 0) && (a_Chunk.GetBlock(a_RelPos.addedY(-1)) == E_BLOCK_FARMLAND));
	}





	virtual ColourID GetMapBaseColourID(NIBBLETYPE a_Meta) const override
	{
		UNUSED(a_Meta);
		return 7;
	}





	virtual int Grow(cChunk & a_Chunk, Vector3i a_RelPos, int a_NumStages = 1) const override
	{
		const auto OldMeta = a_Chunk.GetMeta(a_RelPos);
		const auto NewMeta = std::clamp<NIBBLETYPE>(static_cast<NIBBLETYPE>(OldMeta + a_NumStages), 0, 7);
		a_Chunk.SetMeta(a_RelPos, NewMeta);
		return NewMeta - OldMeta;
	}





	virtual void BearFruit(cChunk & a_Chunk, const Vector3i a_StemRelPos) const override
	{
		auto & Random = GetRandomProvider();

		// Check if there's another produce around the stem, if so, abort:
		static constexpr std::array<Vector3i, 4> NeighborOfs =
		{
			{
				{ 1, 0,  0},
				{-1, 0,  0},
				{ 0, 0,  1},
				{ 0, 0, -1},
			}
		};

		std::array<BLOCKTYPE, 4> BlockType;
		if (
			!a_Chunk.UnboundedRelGetBlockType(a_StemRelPos + NeighborOfs[0], BlockType[0]) ||
			!a_Chunk.UnboundedRelGetBlockType(a_StemRelPos + NeighborOfs[1], BlockType[1]) ||
			!a_Chunk.UnboundedRelGetBlockType(a_StemRelPos + NeighborOfs[2], BlockType[2]) ||
			!a_Chunk.UnboundedRelGetBlockType(a_StemRelPos + NeighborOfs[3], BlockType[3]) ||
			(BlockType[0] == ProduceBlockType) ||
			(BlockType[1] == ProduceBlockType) ||
			(BlockType[2] == ProduceBlockType) ||
			(BlockType[3] == ProduceBlockType)
		)
		{
			// Neighbors not valid or already taken by the same produce:
			return;
		}

		// Pick a direction in which to place the produce:
		int x = 0, z = 0;
		const auto CheckType = Random.RandInt<size_t>(3);  // The index to the neighbors array which should be checked for emptiness
		switch (CheckType)
		{
			case 0: x =  1; break;
			case 1: x = -1; break;
			case 2: z =  1; break;
			case 3: z = -1; break;
		}

		// Check that the block in that direction is empty:
		switch (BlockType[CheckType])
		{
			case E_BLOCK_AIR:
			case E_BLOCK_SNOW:
			case E_BLOCK_TALL_GRASS:
			case E_BLOCK_DEAD_BUSH:
			{
				break;
			}
			default: return;
		}

		// Check if there's soil under the neighbor. We already know the neighbors are valid. Place produce if ok
		BLOCKTYPE SoilType;
		const auto ProduceRelPos = a_StemRelPos + Vector3i(x, 0, z);
		VERIFY(a_Chunk.UnboundedRelGetBlockType(ProduceRelPos.addedY(-1), SoilType));

		switch (SoilType)
		{
			case E_BLOCK_DIRT:
			case E_BLOCK_GRASS:
			case E_BLOCK_FARMLAND:
			{
				const NIBBLETYPE Meta = (ProduceBlockType == E_BLOCK_MELON) ? 0 : static_cast<NIBBLETYPE>(Random.RandInt(4) % 4);

				FLOGD("Growing melon / pumpkin at {0} (<{1}, {2}> from stem), overwriting {3}, growing on top of {4}, meta {5}",
					a_Chunk.RelativeToAbsolute(ProduceRelPos),
					x, z,
					ItemTypeToString(BlockType[CheckType]),
					ItemTypeToString(SoilType),
					Meta
				);

				// Place a randomly-facing produce:
				a_Chunk.SetBlock(ProduceRelPos, ProduceBlockType, Meta);
			}
		}
	}

private:

	// https://minecraft.gamepedia.com/Pumpkin_Seeds#Breaking
	// https://minecraft.gamepedia.com/Melon_Seeds#Breaking
	/** The array describes how many seed may be dropped at which age. The inner arrays describe the probability to drop 0, 1, 2, 3 seeds.
	The outer describes the age of the stem. */
	static constexpr std::array<std::array<double, 4>, 8> m_AgeSeedDropProbability
	{
		{
			{
				81.3, 17.42, 1.24, 0.03
			},
			{
				65.1, 30.04, 4.62, 0.24
			},
			{
				51.2, 38.4, 9.6, 0.8
			},
			{
				39.44, 43.02, 15.64, 1.9
			},
			{
				29.13, 44.44, 22.22, 3.7
			},
			{
				21.6, 43.2, 28.8, 6.4
			},
			{
				15.17, 39.82, 34.84, 10.16
			},
			{
				10.16, 34.84, 39.82, 15.17
			}
		}
	};
} ;

using cBlockMelonStemHandler   = cBlockStemsHandler<E_BLOCK_MELON,   E_ITEM_MELON_SEEDS>;
using cBlockPumpkinStemHandler = cBlockStemsHandler<E_BLOCK_PUMPKIN, E_ITEM_PUMPKIN_SEEDS>;