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#include "Section.hpp"
#include <bitset>
Section::~Section() {
}
Section::Section(Section && other) noexcept {
using std::swap;
swap(*this, other);
}
Block &Section::GetBlock(Vector pos) {
return blocks[pos.y * 256 + pos.z * 16 + pos.x];
}
Block Section::GetBlock(Vector pos) const
{
if (blocks.empty()) {
static Block fallback;
return fallback;
}
return blocks[pos.y * 256 + pos.z * 16 + pos.x];
}
double totalParsingTime = 0;
Section::Section(PackedSection data)
{
if (data.blocks.empty())
return;
worldPosition = data.position;
bool useFirst = false;
if (useFirst) {
unsigned char *blocksData = reinterpret_cast<unsigned char*>(data.blocks.data());
std::vector<unsigned short> blocks;
blocks.reserve(4096);
{
auto begin = std::chrono::steady_clock::now();
int bitPos = 0;
unsigned short t = 0;
for (size_t i = 0; i < data.blocks.size() * 8; i++) {
for (int j = 0; j < 8; j++) {
t |= (blocksData[i] & 0x01) ? 0x80 : 0x00;
t >>= 1;
blocksData[i] >>= 1;
bitPos++;
if (bitPos >= data.bitsPerBlock) {
bitPos = 0;
t >>= data.bitsPerBlock - 1;
blocks.push_back(t);
t = 0;
}
}
}
auto end = std::chrono::steady_clock::now();
std::chrono::duration<double, std::milli> time = end - begin;
totalParsingTime += time.count();
}
std::vector<byte> light;
light.reserve(4096);
for (int i = 0; i < 2048; i++) {
byte t = data.light[i];
byte first = t & 0x0F;
byte second = t >> 4;
light.push_back(0);
light.push_back(0);
}
std::vector<byte> sky;
if (!data.sky.empty()) {
sky.reserve(4096);
for (int i = 0; i < 2048; i++) {
byte t = data.sky[i];
byte first = t & 0x0F;
byte second = t >> 4;
sky.push_back(first);
sky.push_back(second);
}
}
for (int i = 0; i < 4096; i++) {
unsigned short blockId = !data.palette.empty() ? data.palette[blocks[i]] : blocks[i];
Block block(blockId >> 4, blockId & 0xF, light[i], sky.empty() ? 0 : sky[i]);
this->blocks.push_back(block);
}
} else {
std::vector<unsigned short> blocks;
blocks.reserve(4096);
unsigned char individualValueMask = ((1 << data.bitsPerBlock) - 1);
for (int blockNumber = 0; blockNumber < 4096; blockNumber++) {
int startLong = (blockNumber * data.bitsPerBlock) / 64;
int startOffset = (blockNumber * data.bitsPerBlock) % 64;
int endLong = ((blockNumber + 1) * data.bitsPerBlock - 1) / 64;
unsigned short t;
if (startLong == endLong) {
t = (data.blocks[startLong] >> startOffset);
}
else {
int endOffset = 64 - startOffset;
t = (data.blocks[startLong] >> startOffset | data.blocks[endLong] << endOffset);
}
t &= individualValueMask;
if (t >= data.palette.size()) {
//LOG(ERROR) << "Out of palette: "<<t;
blocks.push_back(0);
}
else
blocks.push_back(data.palette.empty() ? t : data.palette[t]);
}
std::vector<unsigned char> light;
light.reserve(4096);
for (int i = 0; i < 2048; i++) {
unsigned char t = data.light[i];
light.push_back(t & 0xF);
light.push_back(t >> 4 & 0xF);
}
std::vector<unsigned char> sky;
if (!data.sky.empty()) {
sky.reserve(4096);
for (int i = 0; i < 2048; i++) {
unsigned char t = data.sky[i];
sky.push_back(t & 0xF);
sky.push_back(t >> 4 & 0xF);
}
}
for (int i = 0; i < 4096; i++) {
unsigned short blockId = blocks[i];
Block block(blockId >> 4, blockId & 0xF, light[i], sky.empty() ? 0 : sky[i]);
this->blocks.push_back(block);
}
}
}
Section &Section::operator=(Section other) noexcept {
using std::swap;
swap(*this, other);
return *this;
}
void swap(Section& lhs, Section& rhs) noexcept {
std::swap(lhs.blocks, rhs.blocks);
std::swap(lhs.worldPosition, rhs.worldPosition);
}
Section::Section(const Section &other) {
worldPosition = other.worldPosition;
this->blocks = other.blocks;
}
Vector Section::GetPosition() const {
return worldPosition;
}
size_t Section::GetHash() const {
if (blocks.empty()) return 0;
const unsigned char *from = reinterpret_cast<const unsigned char *>(blocks.data());
size_t length = blocks.size() * sizeof(Block);
std::string str(from, from + length);
return std::hash<std::string>{}(str);
}
PackedSection::PackedSection(Vector position, byte * dataBlocks, size_t dataBlocksLength, byte * dataLight, byte * dataSky, byte bitsPerBlock, std::vector<unsigned short> palette)
{
this->position = position;
this->palette = palette;
this->bitsPerBlock = bitsPerBlock;
for (long long *t = reinterpret_cast<long long *>(dataBlocks); (byte*)t < dataBlocks + dataBlocksLength; t++) {
long long l = *t;
endswap(l);
this->blocks.push_back(l);
}
light.assign(dataLight, dataLight + 2048);
if (dataSky != nullptr) {
sky.assign(dataSky, dataSky + 2048);
}
}
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