7 files changed, 727 insertions, 28 deletions

diff --git a/Tools/QtBiomeVisualiser/ChunkSource.cpp b/Tools/QtBiomeVisualiser/ChunkSource.cpp
index 2235816bc..54da2afe5 100644
--- a/Tools/QtBiomeVisualiser/ChunkSource.cpp
+++ b/Tools/QtBiomeVisualiser/ChunkSource.cpp
@@ -3,6 +3,8 @@
 #include <QThread>
 #include "Generating/BioGen.h"
 #include "inifile/iniFile.h"
+#include "StringCompression.h"
+#include "WorldStorage/FastNBT.h"
 
 
 
@@ -182,3 +184,242 @@ void BioGenSource::reload()
 
 
 
+
+////////////////////////////////////////////////////////////////////////////////
+// AnvilSource::AnvilFile
+
+class AnvilSource::AnvilFile
+{
+public:
+	/** Coordinates of the region file. */
+	int m_RegionX, m_RegionZ;
+
+	/** True iff the file contains proper data. */
+	bool m_IsValid;
+
+
+
+	/** Creates a new instance with the specified region coords. Reads the file header. */
+	AnvilFile(int a_RegionX, int a_RegionZ, const AString & a_WorldPath) :
+		m_RegionX(a_RegionX),
+		m_RegionZ(a_RegionZ),
+		m_IsValid(false)
+	{
+		readFile(Printf("%s/r.%d.%d.mca", a_WorldPath.c_str(), a_RegionX, a_RegionZ));
+	}
+
+
+
+	/** Returns the compressed data of the specified chunk.
+	Returns an empty string when chunk not present. */
+	AString getChunkData(int a_ChunkX, int a_ChunkZ)
+	{
+		if (!m_IsValid)
+		{
+			return "";
+		}
+
+		// Translate to local coords:
+		int RelChunkX = a_ChunkX - m_RegionX * 32;
+		int RelChunkZ = a_ChunkZ - m_RegionZ * 32;
+		ASSERT((RelChunkX >= 0) && (RelChunkX < 32));
+		ASSERT((RelChunkZ >= 0) && (RelChunkZ < 32));
+
+		// Get the chunk data location:
+		UInt32 chunkOffset = m_Header[RelChunkX + 32 * RelChunkZ] >> 8;
+		UInt32 numChunkSectors = m_Header[RelChunkX + 32 * RelChunkZ] & 0xff;
+		if ((chunkOffset < 2) || (numChunkSectors == 0))
+		{
+			return "";
+		}
+
+		// Get the real data size:
+		const char * chunkData = m_FileData.data() + chunkOffset * 4096;
+		UInt32 chunkSize = GetBEInt(chunkData);
+		if ((chunkSize < 2) || (chunkSize / 4096 > numChunkSectors))
+		{
+			// Bad data, bail out
+			return "";
+		}
+
+		// Check the compression method:
+		if (chunkData[4] != 2)
+		{
+			// Chunk is in an unknown compression
+			return "";
+		}
+		chunkSize--;
+
+		// Read the chunk data:
+		return m_FileData.substr(chunkOffset * 4096 + 5, chunkSize);
+	}
+
+protected:
+	AString m_FileData;
+	UInt32 m_Header[2048];
+
+
+	/** Reads the whole specified file contents and parses the header. */
+	void readFile(const AString & a_FileName)
+	{
+		// Read the entire file:
+		m_FileData = cFile::ReadWholeFile(a_FileName);
+		if (m_FileData.size() < sizeof(m_Header))
+		{
+			return;
+		}
+
+		// Parse the header - change endianness:
+		const char * hdr = m_FileData.data();
+		for (size_t i = 0; i < ARRAYCOUNT(m_Header); i++)
+		{
+			m_Header[i] = GetBEInt(hdr + 4 * i);
+		}
+		m_IsValid = true;
+	}
+};
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// AnvilSource:
+
+AnvilSource::AnvilSource(QString a_WorldRegionFolder) :
+	m_WorldRegionFolder(a_WorldRegionFolder)
+{
+}
+
+
+
+
+
+void AnvilSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk)
+{
+	// Load the compressed data:
+	AString compressedChunkData = getCompressedChunkData(a_ChunkX, a_ChunkZ);
+	if (compressedChunkData.empty())
+	{
+		return;
+	}
+
+	// Uncompress the chunk data:
+	AString uncompressed;
+	int res = InflateString(compressedChunkData.data(), compressedChunkData.size(), uncompressed);
+	if (res != Z_OK)
+	{
+		return;
+	}
+
+	// Parse the NBT data:
+	cParsedNBT nbt(uncompressed.data(), uncompressed.size());
+	if (!nbt.IsValid())
+	{
+		return;
+	}
+
+	// Get the biomes out of the NBT:
+	int Level = nbt.FindChildByName(0, "Level");
+	if (Level < 0)
+	{
+		return;
+	}
+	cChunkDef::BiomeMap biomeMap;
+	int mcsBiomes = nbt.FindChildByName(Level, "MCSBiomes");
+	if ((mcsBiomes >= 0) && (nbt.GetDataLength(mcsBiomes) == sizeof(biomeMap)))
+	{
+		// Convert the biomes from BigEndian to platform native numbers:
+		const char * beBiomes = nbt.GetData(mcsBiomes);
+		for (size_t i = 0; i < ARRAYCOUNT(biomeMap); i++)
+		{
+			biomeMap[i] = (EMCSBiome)GetBEInt(beBiomes + 4 * i);
+		}
+		// Render the biomes:
+		Chunk::Image img;
+		biomesToImage(biomeMap, img);
+		a_DestChunk->setImage(img);
+		return;
+	}
+
+	// MCS biomes not found, load Vanilla biomes instead:
+	int biomes = nbt.FindChildByName(Level, "Biomes");
+	if ((biomes < 0) || (nbt.GetDataLength(biomes) != ARRAYCOUNT(biomeMap)))
+	{
+		return;
+	}
+	// Convert the biomes from Vanilla to EMCSBiome:
+	const char * vanillaBiomes = nbt.GetData(biomes);
+	for (size_t i = 0; i < ARRAYCOUNT(biomeMap); i++)
+	{
+		biomeMap[i] = EMCSBiome(vanillaBiomes[i]);
+	}
+	// Render the biomes:
+	Chunk::Image img;
+	biomesToImage(biomeMap, img);
+	a_DestChunk->setImage(img);
+}
+
+
+
+
+
+void AnvilSource::reload()
+{
+	// Remove all files from the cache:
+	QMutexLocker lock(&m_Mtx);
+	m_Files.clear();
+}
+
+
+
+
+
+void AnvilSource::chunkToRegion(int a_ChunkX, int a_ChunkZ, int & a_RegionX, int & a_RegionZ)
+{
+	a_RegionX = a_ChunkX >> 5;
+	a_RegionZ = a_ChunkZ >> 5;
+}
+
+
+
+
+
+AString AnvilSource::getCompressedChunkData(int a_ChunkX, int a_ChunkZ)
+{
+	return getAnvilFile(a_ChunkX, a_ChunkZ)->getChunkData(a_ChunkX, a_ChunkZ);
+}
+
+
+
+
+
+AnvilSource::AnvilFilePtr AnvilSource::getAnvilFile(int a_ChunkX, int a_ChunkZ)
+{
+	int RegionX, RegionZ;
+	chunkToRegion(a_ChunkX, a_ChunkZ, RegionX, RegionZ);
+
+	// Search the cache for the file:
+	QMutexLocker lock(&m_Mtx);
+	for (auto itr = m_Files.cbegin(), end = m_Files.cend(); itr != end; ++itr)
+	{
+		if (((*itr)->m_RegionX == RegionX) && ((*itr)->m_RegionZ == RegionZ))
+		{
+			// Found the file in the cache, move it to front and return it:
+			AnvilFilePtr file(*itr);
+			m_Files.erase(itr);
+			m_Files.push_front(file);
+			return file;
+		}
+	}
+
+	// File not in cache, create it:
+	AnvilFilePtr file(new AnvilFile(RegionX, RegionZ, m_WorldRegionFolder.toStdString()));
+	m_Files.push_front(file);
+	return file;
+}
+
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/ChunkSource.h b/Tools/QtBiomeVisualiser/ChunkSource.h
index 868e4a144..a5612da01 100644
--- a/Tools/QtBiomeVisualiser/ChunkSource.h
+++ b/Tools/QtBiomeVisualiser/ChunkSource.h
@@ -1,4 +1,5 @@
 #pragma once
+#include "Globals.h"
 #include <QString>
 #include <QMutex>
 #include "Chunk.h"
@@ -64,11 +65,40 @@ class AnvilSource :
 	public ChunkSource
 {
 public:
-	// TODO
+	/** Constructs a new AnvilSource based on the world path. */
+	AnvilSource(QString a_WorldRegionFolder);
 
 	// ChunkSource overrides:
 	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk) override;
-	virtual void reload() override {}
+	virtual void reload() override;
+
+protected:
+	class AnvilFile;
+	typedef std::shared_ptr<AnvilFile> AnvilFilePtr;
+
+
+	/** Folder where the individual Anvil Region files are located. */
+	QString m_WorldRegionFolder;
+
+	/** List of currently loaded files. Acts as a cache so that a file is not opened and closed over and over again.
+	Protected against multithreaded access by m_Mtx. */
+	std::list<AnvilFilePtr> m_Files;
+
+	/** Guards m_Files agains multithreaded access. */
+	QMutex m_Mtx;
+
+
+	/** Converts chunk coords to region coords. */
+	void chunkToRegion(int a_ChunkX, int a_ChunkZ, int & a_RegionX, int & a_RegionZ);
+
+	/** Returns the compressed data of the specified chunk.
+	Returns an empty string if the chunk is not available. */
+	AString getCompressedChunkData(int a_ChunkX, int a_ChunkZ);
+
+	/** Returns the file object that contains the specified chunk.
+	The file is taken from the cache if available there, otherwise it is created anew. */
+	AnvilFilePtr getAnvilFile(int a_ChunkX, int a_ChunkZ);
+
 };
 
 
diff --git a/Tools/QtBiomeVisualiser/GeneratorSetupDlg.cpp b/Tools/QtBiomeVisualiser/GeneratorSetupDlg.cpp
new file mode 100644
index 000000000..e6037fa9b
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/GeneratorSetupDlg.cpp
@@ -0,0 +1,125 @@
+#include "Globals.h"
+#include "GeneratorSetupDlg.h"
+#include <QLabel>
+#include <QLineEdit>
+#include "Generating/BioGen.h"
+#include "inifile/iniFile.h"
+
+
+
+
+
+static const QString s_GeneratorNames[] =
+{
+	QString("Checkerboard"),
+	QString("Constant"),
+	QString("DistortedVoronoi"),
+	QString("MultiStepMap"),
+	QString("TwoLevel"),
+	QString("Voronoi"),
+};
+
+
+
+
+
+GeneratorSetupDlg::GeneratorSetupDlg(const AString & a_IniFileName, QWidget * a_Parent) :
+	super(a_Parent),
+	m_IniFile(new cIniFile())
+{
+	// The generator name is in a separate form layout at the top, always present:
+	m_cbGenerator = new QComboBox();
+	m_cbGenerator->setMinimumWidth(300);
+	for (size_t i = 0; i < ARRAYCOUNT(s_GeneratorNames); i++)
+	{
+		m_cbGenerator->addItem(s_GeneratorNames[i]);
+	}
+	QFormLayout * nameLayout = new QFormLayout();
+	nameLayout->addRow(new QLabel(tr("Generator")), m_cbGenerator);
+
+	// The rest of the controls are in a dynamically created form layout:
+	m_FormLayout = new QFormLayout();
+
+	// The main layout joins these two vertically:
+	m_MainLayout = new QVBoxLayout();
+	m_MainLayout->addLayout(nameLayout);
+	m_MainLayout->addLayout(m_FormLayout);
+	setLayout(m_MainLayout);
+
+	// Load the INI file, if specified, otherwise set defaults:
+	if (!a_IniFileName.empty() && m_IniFile->ReadFile(a_IniFileName))
+	{
+		m_cbGenerator->setCurrentText(QString::fromStdString(m_IniFile->GetValue("Generator", "BiomeGen")));
+	}
+	else
+	{
+		m_IniFile->SetValue("Generator", "Generator", "Composable");
+		m_IniFile->SetValue("Generator", "BiomeGen", m_cbGenerator->currentText().toStdString());
+		bool dummy;
+		delete cBiomeGen::CreateBiomeGen(*m_IniFile, m_Seed, dummy);
+	}
+	updateFromIni();
+
+	// Connect the combo change even only after the data has been loaded:
+	connect(m_cbGenerator, SIGNAL(currentIndexChanged(const QString &)), this, SLOT(generatorChanged(QString)));
+}
+
+
+
+
+
+void GeneratorSetupDlg::generatorChanged(const QString & a_NewName)
+{
+	// Clear the current contents of the form layout by assigning it to a stack temporary:
+	{
+		m_MainLayout->takeAt(1);
+		QWidget().setLayout(m_FormLayout);
+	}
+
+	// Re-create the layout:
+	m_FormLayout = new QFormLayout();
+	m_MainLayout->addLayout(m_FormLayout);
+
+	// Recreate the INI file:
+	m_IniFile->Clear();
+	m_IniFile->SetValue("Generator", "Generator", "Composable");
+	m_IniFile->SetValue("Generator", "BiomeGen", a_NewName.toStdString());
+
+	// Create a dummy biome gen from the INI file, this will create the defaults in the INI file:
+	bool dummy;
+	delete cBiomeGen::CreateBiomeGen(*m_IniFile, m_Seed, dummy);
+
+	// Read all values from the INI file and put them into the form layout:
+	updateFromIni();
+}
+
+
+
+
+
+void GeneratorSetupDlg::updateFromIni()
+{
+	int keyID = m_IniFile->FindKey("Generator");
+	if (keyID <= -1)
+	{
+		return;
+	}
+	int numItems = m_IniFile->GetNumValues(keyID);
+	for (int i = 0; i < numItems; i++)
+	{
+		AString itemName  = m_IniFile->GetValueName(keyID, i);
+		AString itemValue = m_IniFile->GetValue(keyID, i);
+		if ((itemName == "Generator") || (itemName == "BiomeGen"))
+		{
+			// These special cases are not to be added
+			continue;
+		}
+		QLineEdit * edit = new QLineEdit();
+		edit->setText(QString::fromStdString(itemValue));
+		m_FormLayout->addRow(new QLabel(QString::fromStdString(itemName)), edit);
+	}  // for i - INI values[]
+}
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/GeneratorSetupDlg.h b/Tools/QtBiomeVisualiser/GeneratorSetupDlg.h
new file mode 100644
index 000000000..d7070e331
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/GeneratorSetupDlg.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <memory>
+#include <QDialog>
+#include <QComboBox>
+#include <QVBoxLayout>
+#include <QFormLayout>
+
+
+
+
+
+class cIniFile;
+
+
+
+
+
+class GeneratorSetupDlg :
+	public QDialog
+{
+	typedef QDialog super;
+
+	Q_OBJECT
+
+public:
+	/** Creates the dialog and loads the contents of the INI file, if not empty. */
+	explicit GeneratorSetupDlg(const std::string & a_IniFileName, QWidget * parent = nullptr);
+
+signals:
+
+public slots:
+	/** Called when the user selects a different generator from the top combobox.
+	Re-creates m_IniFile and updates the form layout. */
+	void generatorChanged(const QString & a_NewName);
+
+protected:
+	QComboBox * m_cbGenerator;
+	QVBoxLayout * m_MainLayout;
+	QFormLayout * m_FormLayout;
+
+	std::unique_ptr<cIniFile> m_IniFile;
+
+	int m_Seed;
+
+
+	/** Updates the form layout with the values from m_IniFile. */
+	void updateFromIni();
+};
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/MainWindow.cpp b/Tools/QtBiomeVisualiser/MainWindow.cpp
index 65d0ccf5e..d2c1ae2c1 100644
--- a/Tools/QtBiomeVisualiser/MainWindow.cpp
+++ b/Tools/QtBiomeVisualiser/MainWindow.cpp
@@ -5,9 +5,14 @@
 #include <QMenuBar>
 #include <QApplication>
 #include <QFileDialog>
+#include <QSettings>
+#include <QDirIterator>
 #include "inifile/iniFile.h"
 #include "ChunkSource.h"
 #include "Generating/BioGen.h"
+#include "StringCompression.h"
+#include "WorldStorage/FastNBT.h"
+#include "GeneratorSetupDlg.h"
 
 
 
@@ -16,6 +21,8 @@
 MainWindow::MainWindow(QWidget * parent) :
 	QMainWindow(parent)
 {
+	initMinecraftPath();
+
 	m_BiomeView = new BiomeView(this);
 	setCentralWidget(m_BiomeView);
 
@@ -36,9 +43,37 @@ MainWindow::~MainWindow()
 
 
 
-void MainWindow::generate()
+void MainWindow::newGenerator()
+{
+	// TODO
+
+	// (Re-)open the generator setup dialog:
+	m_GeneratorSetupDlg.reset(new GeneratorSetupDlg(""));
+	m_GeneratorSetupDlg->show();
+	m_GeneratorSetupDlg->raise();
+
+	// TODO
+}
+
+
+
+
+
+void MainWindow::openGenerator()
 {
+	// Let the user specify the world.ini file:
 	QString worldIni = QFileDialog::getOpenFileName(this, tr("Open world.ini"), QString(), tr("world.ini (world.ini)"));
+	if (worldIni.isEmpty())
+	{
+		return;
+	}
+
+	// (Re-)open the generator setup dialog:
+	m_GeneratorSetupDlg.reset(new GeneratorSetupDlg(worldIni.toStdString()));
+	m_GeneratorSetupDlg->show();
+	m_GeneratorSetupDlg->raise();
+
+	// Set the chunk source:
 	m_BiomeView->setChunkSource(std::shared_ptr<BioGenSource>(new BioGenSource(worldIni)));
 	m_BiomeView->redraw();
 }
@@ -47,9 +82,66 @@ void MainWindow::generate()
 
 
 
-void MainWindow::open()
+void MainWindow::openWorld()
 {
-	// TODO
+	// Let the user specify the world:
+	QString regionFolder = QFileDialog::getExistingDirectory(this, tr("Select the region folder"), QString());
+	if (regionFolder.isEmpty())
+	{
+		return;
+	}
+
+	// Remove the generator setup dialog, if open:
+	if (m_GeneratorSetupDlg.get() != nullptr)
+	{
+		m_GeneratorSetupDlg->hide();
+		m_GeneratorSetupDlg.reset(nullptr);
+	}
+
+	// Set the chunk source:
+	m_BiomeView->setChunkSource(std::shared_ptr<AnvilSource>(new AnvilSource(regionFolder)));
+	m_BiomeView->redraw();
+}
+
+
+
+
+
+void MainWindow::openVanillaWorld()
+{
+	// The world is stored in the sender action's data, retrieve it:
+	QAction * action = qobject_cast<QAction *>(sender());
+	if (action == nullptr)
+	{
+		return;
+	}
+
+	// Remove the generator setup dialog, if open:
+	if (m_GeneratorSetupDlg.get() != nullptr)
+	{
+		m_GeneratorSetupDlg->hide();
+		m_GeneratorSetupDlg.reset(nullptr);
+	}
+
+	// Set the chunk source:
+	m_BiomeView->setChunkSource(std::shared_ptr<AnvilSource>(new AnvilSource(action->data().toString())));
+	m_BiomeView->redraw();
+}
+
+
+
+
+
+void MainWindow::initMinecraftPath()
+{
+	#ifdef Q_OS_MAC
+		m_MinecraftPath = QDir::homePath() + QDir::toNativeSeparators("/Library/Application Support/minecraft");
+	#elif defined Q_OS_WIN32
+		QSettings ini(QSettings::IniFormat, QSettings::UserScope, ".minecraft", "minecraft1");
+		m_MinecraftPath = QFileInfo(ini.fileName()).absolutePath();
+	#else
+		m_MinecraftPath = QDir::homePath() + QDir::toNativeSeparators("/.minecraft");
+	#endif
 }
 
 
@@ -58,19 +150,26 @@ void MainWindow::open()
 
 void MainWindow::createActions()
 {
-	m_actGen = new QAction(tr("&Generate..."), this);
-	m_actGen->setShortcut(tr("Ctrl+N"));
-	m_actGen->setStatusTip(tr("Open a generator INI file and display the generated biomes"));
-	connect(m_actGen, SIGNAL(triggered()), this, SLOT(generate()));
+	createWorldActions();
+
+	m_actNewGen = new QAction(tr("&New generator"), this);
+	m_actNewGen->setShortcut(tr("Ctrl+N"));
+	m_actNewGen->setStatusTip(tr("Open a generator INI file and display the generated biomes"));
+	connect(m_actNewGen, SIGNAL(triggered()), this, SLOT(newGenerator()));
+
+	m_actOpenGen = new QAction(tr("&Open generator..."), this);
+	m_actOpenGen->setShortcut(tr("Ctrl+G"));
+	m_actOpenGen->setStatusTip(tr("Open a generator INI file and display the generated biomes"));
+	connect(m_actOpenGen, SIGNAL(triggered()), this, SLOT(openGenerator()));
 
-	m_actOpen = new QAction(tr("&Open world..."), this);
-	m_actOpen->setShortcut(tr("Ctrl+O"));
-	m_actOpen->setStatusTip(tr("Open an existing world and display its biomes"));
-	connect(m_actOpen, SIGNAL(triggered()), this, SLOT(open()));
+	m_actOpenWorld = new QAction(tr("&Open world..."), this);
+	m_actOpenWorld->setShortcut(tr("Ctrl+O"));
+	m_actOpenWorld->setStatusTip(tr("Open an existing world and display its biomes"));
+	connect(m_actOpenWorld, SIGNAL(triggered()), this, SLOT(openWorld()));
 
 	m_actReload = new QAction(tr("&Reload"), this);
 	m_actReload->setShortcut(tr("F5"));
-	m_actReload->setStatusTip(tr("Open an existing world and display its biomes"));
+	m_actReload->setStatusTip(tr("Clear the view cache and force a reload of all the data"));
 	connect(m_actReload, SIGNAL(triggered()), m_BiomeView, SLOT(reload()));
 
 	m_actExit = new QAction(tr("E&xit"), this);
@@ -83,15 +182,95 @@ void MainWindow::createActions()
 
 
 
+void MainWindow::createWorldActions()
+{
+	QDir mc(m_MinecraftPath);
+	if (!mc.cd("saves"))
+	{
+		return;
+	}
+
+	QDirIterator it(mc);
+	int key = 1;
+	while (it.hasNext())
+	{
+		it.next();
+		if (!it.fileInfo().isDir())
+		{
+			continue;
+		}
+		QString name = getWorldName(it.filePath().toStdString());
+		if (name.isEmpty())
+		{
+			continue;
+		}
+		QAction * w = new QAction(this);
+		w->setText(name);
+		w->setData(it.filePath() + "/region");
+		if (key < 10)
+		{
+			w->setShortcut("Ctrl+" + QString::number(key));
+			key++;
+		}
+		connect(w, SIGNAL(triggered()), this, SLOT(openVanillaWorld()));
+		m_WorldActions.append(w);
+	}
+}
+
+
+
+
+
 void MainWindow::createMenus()
 {
-	QMenu * mFile = menuBar()->addMenu(tr("&World"));
-	mFile->addAction(m_actGen);
-	mFile->addAction(m_actOpen);
-	mFile->addSeparator();
-	mFile->addAction(m_actReload);
-	mFile->addSeparator();
-	mFile->addAction(m_actExit);
+	QMenu * file = menuBar()->addMenu(tr("&Map"));
+	file->addAction(m_actNewGen);
+	file->addAction(m_actOpenGen);
+	file->addSeparator();
+	QMenu * worlds = file->addMenu(tr("Open existing"));
+	worlds->addActions(m_WorldActions);
+	if (m_WorldActions.empty())
+	{
+		worlds->setEnabled(false);
+	}
+	file->addAction(m_actOpenWorld);
+	file->addSeparator();
+	file->addAction(m_actReload);
+	file->addSeparator();
+	file->addAction(m_actExit);
+}
+
+
+
+
+
+QString MainWindow::getWorldName(const AString & a_Path)
+{
+	AString levelData = cFile::ReadWholeFile(a_Path + "/level.dat");
+	if (levelData.empty())
+	{
+		// No such file / no data
+		return QString();
+	}
+
+	AString uncompressed;
+	if (UncompressStringGZIP(levelData.data(), levelData.size(), uncompressed) != Z_OK)
+	{
+		return QString();
+	}
+	cParsedNBT nbt(uncompressed.data(), uncompressed.size());
+	if (!nbt.IsValid())
+	{
+		return QString();
+	}
+	AString name = nbt.GetName(1);
+	OutputDebugStringA(name.c_str());
+	int levelNameTag = nbt.FindTagByPath(nbt.GetRoot(), "Data\\LevelName");
+	if ((levelNameTag <= 0) || (nbt.GetType(levelNameTag) != TAG_String))
+	{
+		return QString();
+	}
+	return QString::fromStdString(nbt.GetString(levelNameTag));
 }
 
 
diff --git a/Tools/QtBiomeVisualiser/MainWindow.h b/Tools/QtBiomeVisualiser/MainWindow.h
index b37bf4120..840e01b0f 100644
--- a/Tools/QtBiomeVisualiser/MainWindow.h
+++ b/Tools/QtBiomeVisualiser/MainWindow.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <memory>
+#include <QList>
 #include <QMainWindow>
 #include "BiomeView.h"
 
@@ -7,6 +9,13 @@
 
 
 
+// fwd:
+class GeneratorSetupDlg;
+
+
+
+
+
 class MainWindow :
 	public QMainWindow
 {
@@ -15,29 +24,55 @@ class MainWindow :
 	BiomeView * m_BiomeView;
 
 public:
-	MainWindow(QWidget *parent = 0);
+	MainWindow(QWidget * parent = nullptr);
 	~MainWindow();
 
 private slots:
+	/** Creates a generator definition from scratch, lets user modify generator params in realtime. */
+	void newGenerator();
+
 	/** Opens a generator definition and generates the biomes based on that. */
-	void generate();
+	void openGenerator();
 
 	/** Opens an existing world and displays the loaded biomes. */
-	void open();
+	void openWorld();
+
+	/** Opens a vanilla world that is specified by the calling action. */
+	void openVanillaWorld();
 
 protected:
 	// Actions:
-	QAction * m_actGen;
-	QAction * m_actOpen;
+	QAction * m_actNewGen;
+	QAction * m_actOpenGen;
+	QAction * m_actOpenWorld;
 	QAction * m_actReload;
 	QAction * m_actExit;
 
+	/** List of actions that open the specific vanilla world. */
+	QList<QAction *> m_WorldActions;
+
+	/** Path to the vanilla folder. */
+	QString m_MinecraftPath;
+
+	/** The dialog for setting up the generator. */
+	std::unique_ptr<GeneratorSetupDlg> m_GeneratorSetupDlg;
+
+
+	/** Initializes the m_MinecraftPath based on the proper MC path */
+	void initMinecraftPath();
 
 	/** Creates the actions that the UI supports. */
 	void createActions();
 
+	/** Creates the actions that open a specific vanilla world. Iterates over the minecraft saves folder. */
+	void createWorldActions();
+
 	/** Creates the menu bar and connects its events. */
 	void createMenus();
+
+	/** Returns the name of the vanilla world in the specified path.
+	Reads the level.dat file for the name. Returns an empty string on failure. */
+	QString getWorldName(const AString & a_Path);
 };
 
 
diff --git a/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro b/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro
index e6b65e628..7171562bb 100644
--- a/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro
+++ b/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro
@@ -29,7 +29,25 @@ SOURCES += main.cpp\
     ChunkCache.cpp \
     Chunk.cpp \
     ChunkSource.cpp \
-    ChunkLoader.cpp
+    ChunkLoader.cpp \
+    ../../src/StringCompression.cpp \
+    ../../src/WorldStorage/FastNBT.cpp \
+    ../../lib/zlib/adler32.c \
+    ../../lib/zlib/compress.c \
+    ../../lib/zlib/crc32.c \
+    ../../lib/zlib/deflate.c \
+    ../../lib/zlib/gzclose.c \
+    ../../lib/zlib/gzlib.c \
+    ../../lib/zlib/gzread.c \
+    ../../lib/zlib/gzwrite.c \
+    ../../lib/zlib/infback.c \
+    ../../lib/zlib/inffast.c \
+    ../../lib/zlib/inflate.c \
+    ../../lib/zlib/inftrees.c \
+    ../../lib/zlib/trees.c \
+    ../../lib/zlib/uncompr.c \
+    ../../lib/zlib/zutil.c \
+    GeneratorSetupDlg.cpp
 
 HEADERS  += MainWindow.h \
 		Globals.h \
@@ -48,7 +66,21 @@ HEADERS  += MainWindow.h \
     ChunkCache.h \
     Chunk.h \
     ChunkSource.h \
-    ChunkLoader.h
+    ChunkLoader.h \
+    ../../src/StringCompression.h \
+    ../../src/WorldStorage/FastNBT.h \
+    ../../lib/zlib/crc32.h \
+    ../../lib/zlib/deflate.h \
+    ../../lib/zlib/gzguts.h \
+    ../../lib/zlib/inffast.h \
+    ../../lib/zlib/inffixed.h \
+    ../../lib/zlib/inflate.h \
+    ../../lib/zlib/inftrees.h \
+    ../../lib/zlib/trees.h \
+    ../../lib/zlib/zconf.h \
+    ../../lib/zlib/zlib.h \
+    ../../lib/zlib/zutil.h \
+    GeneratorSetupDlg.h
 
 INCLUDEPATH += $$_PRO_FILE_PWD_ \
 	$$_PRO_FILE_PWD_/../../src \
@@ -57,4 +89,8 @@ INCLUDEPATH += $$_PRO_FILE_PWD_ \
 
 CONFIG += C++11
 
+OTHER_FILES += \
+    ../../lib/zlib/example.c.txt \
+    ../../lib/zlib/minigzip.c.txt
+