From f942405184c2d6067fb5303b58a225edf7e452b1 Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Sat, 29 Jul 2017 19:55:16 +0500
Subject: 2017-07-29

---
 src/Section.cpp | 147 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 src/Section.cpp

(limited to 'src/Section.cpp')

diff --git a/src/Section.cpp b/src/Section.cpp
new file mode 100644
index 0000000..8b86afd
--- /dev/null
+++ b/src/Section.cpp
@@ -0,0 +1,147 @@
+#include "Section.hpp"
+
+
+Section::Section(Vector position, byte *dataBlocks, size_t dataBlocksLength, byte *dataLight, byte *dataSky,
+                 byte bitsPerBlock,
+                 std::vector<unsigned short> palette) {
+	worldPosition = position;
+
+	m_dataBlocksLen = dataBlocksLength;
+	m_dataBlocks = new byte[m_dataBlocksLen];
+	std::copy(dataBlocks, dataBlocks + m_dataBlocksLen, m_dataBlocks);
+
+	m_dataLight = new byte[2048];
+	std::copy(dataLight, dataLight + 2048, m_dataLight);
+
+	if (dataSky) {
+		m_dataSkyLight = new byte[2048];
+		std::copy(dataSky, dataSky + 2048, m_dataSkyLight);
+	}
+
+	m_palette = palette;
+	m_bitsPerBlock = bitsPerBlock;
+}
+
+Section::~Section() {
+	delete[] m_dataBlocks;
+	m_dataBlocksLen = 0;
+	m_dataBlocks = nullptr;
+	delete[] m_dataLight;
+	m_dataLight = nullptr;
+	delete[] m_dataSkyLight;
+	m_dataSkyLight = nullptr;
+}
+
+Block &Section::GetBlock(Vector pos) {
+	return m_blocks[pos.GetY() * 256 + pos.GetZ() * 16 + pos.GetX()];
+}
+
+double totalParsingTime = 0;
+
+void Section::Parse() {
+	if (!m_blocks.empty())
+		return;
+
+	long long *longArray = reinterpret_cast<long long *>(m_dataBlocks);
+	for (size_t i = 0; i < m_dataBlocksLen / 8; i++)
+		endswap(&longArray[i]);
+	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 < m_dataBlocksLen; i++) {
+			for (int j = 0; j < 8; j++) {
+				t |= (m_dataBlocks[i] & 0x01) ? 0x80 : 0x00;
+				t >>= 1;
+				m_dataBlocks[i] >>= 1;
+				bitPos++;
+				if (bitPos >= m_bitsPerBlock) {
+					bitPos = 0;
+					t >>= m_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 = m_dataLight[i];
+		byte first = t & 0b11110000;
+		byte second = t >> 4;
+		light.push_back(first);
+		light.push_back(second);
+	}
+	for (int i = 0; i < 4096; i++) {
+		unsigned short blockId = m_palette.size() > 0 ? m_palette[blocks[i]] : blocks[i];
+		Block block(blockId >> 4, blockId & 0xF);
+		m_blocks.push_back(block);
+	}
+	delete[] m_dataBlocks;
+	m_dataBlocksLen = 0;
+	m_dataBlocks = nullptr;
+	delete[] m_dataLight;
+	m_dataLight = nullptr;
+	delete[] m_dataSkyLight;
+	m_dataSkyLight = nullptr;
+
+	parseWaiter.notify_all();
+}
+
+Section &Section::operator=(Section other) {
+	std::swap(*this, other);
+	return *this;
+}
+
+void swap(Section &a, Section &b) {
+	using std::swap;
+	swap(a.m_dataBlocksLen, b.m_dataBlocksLen);
+	swap(a.m_dataBlocks, b.m_dataBlocks);
+	swap(a.m_dataLight, b.m_dataLight);
+	swap(a.m_dataSkyLight, b.m_dataSkyLight);
+	swap(a.m_blocks, b.m_blocks);
+	swap(a.m_palette, b.m_palette);
+	swap(a.m_bitsPerBlock, b.m_bitsPerBlock);
+}
+
+Section::Section(const Section &other) {
+	worldPosition = other.worldPosition;
+	m_dataBlocksLen = other.m_dataBlocksLen;
+	if (other.m_blocks.empty()) {
+		m_dataBlocks = new byte[m_dataBlocksLen];
+		std::copy(other.m_dataBlocks, other.m_dataBlocks + m_dataBlocksLen, m_dataBlocks);
+
+		m_dataLight = new byte[2048];
+		std::copy(other.m_dataLight, other.m_dataLight + 2048, m_dataLight);
+
+		if (other.m_dataSkyLight) {
+			m_dataSkyLight = new byte[2048];
+			std::copy(other.m_dataSkyLight, other.m_dataSkyLight + 2048, m_dataSkyLight);
+		}
+	} else {
+		std::copy(other.m_blocks.begin(), other.m_blocks.end(), std::back_inserter(m_blocks));
+	}
+
+	m_palette = other.m_palette;
+	m_bitsPerBlock = other.m_bitsPerBlock;
+}
+
+Vector Section::GetPosition() {
+	return worldPosition;
+}
+
+size_t Section::GetHash() {
+	if (m_blocks.empty()) return 0;
+
+	unsigned char *from = reinterpret_cast<unsigned char *>(m_blocks.data());
+	size_t length = m_blocks.size() * sizeof(Block);
+
+	std::string str(from, from + length);
+	return std::hash<std::string>{}(str);
+}
\ No newline at end of file
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