From b30f16d7c9a832ed09b5cd03d73f343f933ca872 Mon Sep 17 00:00:00 2001
From: LaG1924 <12997935+LaG1924@users.noreply.github.com>
Date: Wed, 28 Mar 2018 19:21:50 +0500
Subject: Minor Section optimizations

---
 src/RendererSectionData.cpp |  4 ++--
 src/Section.cpp             | 29 +++++++++--------------------
 src/Section.hpp             |  6 +++---
 src/World.cpp               |  4 ++--
 4 files changed, 16 insertions(+), 27 deletions(-)

diff --git a/src/RendererSectionData.cpp b/src/RendererSectionData.cpp
index 96d78e0..6554d16 100644
--- a/src/RendererSectionData.cpp
+++ b/src/RendererSectionData.cpp
@@ -213,7 +213,7 @@ RendererSectionData ParseSection(const SectionsData &sections)
 }
 
 unsigned char SectionsData::GetLight(const Vector & pos) const {
-	const Vector directions[] = {
+	static const Vector directions[] = {
 		Vector(0,0,0),
 		Vector(1,0,0),
 		Vector(-1,0,0),
@@ -252,7 +252,7 @@ unsigned char SectionsData::GetLight(const Vector & pos) const {
 }
 
 unsigned char SectionsData::GetSkyLight(const Vector & pos) const {
-	const Vector directions[] = {
+	static const Vector directions[] = {
 		Vector(0,0,0),
 		Vector(1,0,0),
 		Vector(-1,0,0),
diff --git a/src/Section.cpp b/src/Section.cpp
index 1f60471..c8c67dc 100644
--- a/src/Section.cpp
+++ b/src/Section.cpp
@@ -13,17 +13,12 @@ void Section::CalculateHash() const {
     size_t offset = 0;
 
     std::vector<unsigned char> rawData;    
-    rawData.resize(block.size() * sizeof(long long) + light.size() + sky.size());
+    rawData.resize(block.size() * sizeof(long long) + 4096);
     
-    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));
-
+	std::memcpy(rawData.data(), light, 2048);
+	std::memcpy(rawData.data() + 2048, sky, 2048);
+	std::memcpy(rawData.data() + 4096, block.data(), block.size() * sizeof(long long));    
+	
     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);
@@ -36,7 +31,7 @@ void Section::CalculateHash() const {
     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) {
+Section::Section(Vector pos, unsigned char bitsPerBlock, std::vector<unsigned short> palette, std::vector<long long> blockData, const std::vector<unsigned char> &lightData, const std::vector<unsigned char> &skyData) {
     if (bitsPerBlock < 4)
         bitsPerBlock = 4;
     if (bitsPerBlock > 8)
@@ -46,8 +41,8 @@ Section::Section(Vector pos, unsigned char bitsPerBlock, std::vector<unsigned sh
     this->worldPosition = pos;
     this->block = std::move(blockData);
     this->palette = std::move(palette);
-	this->light = std::move(lightData);
-    this->sky = std::move(skyData);
+	std::copy(lightData.begin(), lightData.end(), light);
+	std::copy(skyData.begin(), skyData.end(), sky);
 
     hash = -1;
 }
@@ -99,9 +94,6 @@ BlockId Section::GetBlockId(Vector pos) const {
 
 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);
@@ -109,10 +101,7 @@ unsigned char Section::GetBlockLight(Vector pos) const
 
 unsigned char Section::GetBlockSkyLight(Vector pos) const
 {
-    if (sky.empty())
-        return 0;
-
-    int blockNumber = pos.y * 256 + pos.z * 16 + pos.x;
+	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);
 }
diff --git a/src/Section.hpp b/src/Section.hpp
index bc8b70b..b85eb43 100644
--- a/src/Section.hpp
+++ b/src/Section.hpp
@@ -8,8 +8,8 @@
 
 class Section {
     std::vector<long long> block;
-    std::vector<unsigned char> light;
-    std::vector<unsigned char> sky;
+	unsigned char light[2048] = {};
+	unsigned char sky[2048] = {};
     unsigned char bitsPerBlock = 0;
     std::vector<unsigned short> palette;
 
@@ -20,7 +20,7 @@ class Section {
 
     std::map<Vector, BlockId> overrideList;
 public:
-    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);
+    Section(Vector pos, unsigned char bitsPerBlock, std::vector<unsigned short> palette, std::vector<long long> blockData, const std::vector<unsigned char> &lightData, const std::vector<unsigned char> &skyData);
     
 	Section() = default;
 	
diff --git a/src/World.cpp b/src/World.cpp
index f9eb560..76598e3 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -421,7 +421,7 @@ unsigned char World::GetBlockLight(Vector pos)
 
 unsigned char World::GetBlockLight(const Vector &blockPos, const Section *section, const Section *xp, const Section *xn, const Section *yp, const Section *yn, const Section *zp, const Section *zn)
 {
-	const Vector directions[] = {
+	static const Vector directions[] = {
 		Vector(0,0,0),
 		Vector(1,0,0),
 		Vector(-1,0,0),
@@ -482,7 +482,7 @@ unsigned char World::GetBlockSkyLight(Vector pos)
 
 unsigned char World::GetBlockSkyLight(const Vector &blockPos, const Section *section, const Section *xp, const Section *xn, const Section *yp, const Section *yn, const Section *zp, const Section *zn)
 {
-	const Vector directions[] = {
+	static const Vector directions[] = {
 		Vector(0,0,0),
 		Vector(1,0,0),
 		Vector(-1,0,0),
-- 
cgit v1.2.3