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#include "Section.hpp"
#include <bitset>
#include <cstring>
void Section::CalculateHash() const {
if (block.empty()) {
hash = 0;
return;
}
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;
}
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
{
if (light.empty())
return 0;
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
{
if (sky.empty())
return 0;
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;
}
Vector Section::GetPosition() const {
return worldPosition;
}
size_t Section::GetHash() const {
if (hash == -1)
CalculateHash();
return hash;
}
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