summaryrefslogtreecommitdiffstats
path: root/src/Section.cpp
blob: e6b6d93699a2be65b88bb4ab0f584bb768fa068a (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
#include "Section.hpp"

#include <bitset>

void Section::CalculateHash() const {
    size_t offset = 0;

    std::vector<unsigned char> rawData;    
    rawData.resize(block.size() * sizeof(long long) + light.size() + sky.size());
    
    std::memcpy(rawData.data() + offset, block.data(), block.size() * sizeof(BlockId));
    offset += block.size() * sizeof(BlockId);

    std::memcpy(rawData.data() + offset, light.data(), light.size() * sizeof(unsigned char));
    offset += light.size() * sizeof(unsigned char);

    if (!sky.empty())
        std::memcpy(rawData.data() + offset, sky.data(), sky.size() * sizeof(unsigned char));

    for (auto& it : overrideList) {
        rawData.push_back(*reinterpret_cast<const unsigned short*> (&it.second) & 0xF);
        rawData.push_back(*reinterpret_cast<const unsigned short*> (&it.second) >> 0xF);
    }
    
    const unsigned char *from = reinterpret_cast<const unsigned char *>(rawData.data());
    size_t length = rawData.size();

    std::string str(from, from + length);
    hash =  std::hash<std::string>{}(str);
}

Section::Section(Vector pos, unsigned char bitsPerBlock, std::vector<unsigned short> palette, std::vector<long long> blockData, std::vector<unsigned char> lightData, std::vector<unsigned char> skyData) {
    if (bitsPerBlock < 4)
        bitsPerBlock = 4;
    if (bitsPerBlock > 8)
        bitsPerBlock = 13;
    this->bitsPerBlock = bitsPerBlock;

    this->worldPosition = pos;
    this->block = std::move(blockData);
    this->palette = std::move(palette);
    this->light = std::move(lightData);
    this->sky = std::move(skyData);

    hash = -1;
}

Section::Section():hash(-1),bitsPerBlock(0) {
}

Section::~Section() {

}

Section::Section(Section && other) noexcept {
    using std::swap;
    swap(*this, other);
    hash = -1;
}

Section &Section::operator=(Section other) noexcept {
    using std::swap;
	swap(*this, other);
    hash = -1;
	return *this;
}

BlockId Section::GetBlockId(Vector pos) const {
    if (block.empty())
        return BlockId{ 0,0 };

    if (!overrideList.empty()) {
        auto iter = overrideList.find(pos);
        if (iter != overrideList.end())
            return iter->second;
    }

    int value;

    unsigned char individualValueMask = ((1 << bitsPerBlock) - 1);

    int blockNumber = (((pos.y * 16) + pos.z) * 16) + pos.x;
    int startLong = (blockNumber * bitsPerBlock) / 64;
    int startOffset = (blockNumber * bitsPerBlock) % 64;
    int endLong = ((blockNumber + 1) * bitsPerBlock - 1) / 64;

    unsigned char t;

    if (startLong == endLong) {
        t = (block[startLong] >> startOffset);
    }
    else {
        int endOffset = 64 - startOffset;
        t = (block[startLong] >> startOffset |block[endLong] << endOffset);
    }

    t &= individualValueMask;


    if (t >= palette.size()) {
        //LOG(ERROR) << "Out of palette: " << t;
        value = 0;
    }
    else
        value = palette[t];

    BlockId blockId;
    blockId.id = value >> 4;
    blockId.state = value & 0xF;
    return blockId;
}

unsigned char Section::GetBlockLight(Vector pos) const
{
    int blockNumber = pos.y * 256 + pos.z * 16 + pos.x;
    unsigned char lightValue = this->light[blockNumber / 2];
    return (blockNumber % 2 == 0) ? (lightValue & 0xF) : (lightValue >> 4);
}

unsigned char Section::GetBlockSkyLight(Vector pos) const
{
    int blockNumber = pos.y * 256 + pos.z * 16 + pos.x;
    unsigned char skyValue = this->sky[blockNumber / 2];
    return (blockNumber % 2 == 0) ? (skyValue & 0xF) : (skyValue >> 4);
}

void Section::SetBlockId(Vector pos, BlockId value) {
    overrideList[pos] = value;
    hash = -1;
}

void swap(Section& lhs, Section& rhs) noexcept {
    std::swap(lhs.block, rhs.block);
    std::swap(lhs.light, rhs.light);
    std::swap(lhs.sky, rhs.sky);
    std::swap(lhs.bitsPerBlock, rhs.bitsPerBlock);
    std::swap(lhs.palette, rhs.palette);
    std::swap(lhs.hash, rhs.hash);
    std::swap(lhs.worldPosition, rhs.worldPosition);
}

Section::Section(const Section &other) {
	worldPosition = other.worldPosition;	
    this->block = other.block;
    this->light = other.light;
    this->sky = other.sky;
    this->bitsPerBlock = other.bitsPerBlock;
    this->palette = other.palette;
    this->hash = other.hash;
    this->worldPosition = other.worldPosition;
}

Vector Section::GetPosition() const {
	return worldPosition;
}

size_t Section::GetHash() const {
    if (hash == -1)
        CalculateHash();
    return hash;
}