20 files changed, 977 insertions, 551 deletions

diff --git a/Tools/QtBiomeVisualiser/BiomeView.cpp b/Tools/QtBiomeVisualiser/BiomeView.cpp
index ce5a870cd..c77b39482 100644
--- a/Tools/QtBiomeVisualiser/BiomeView.cpp
+++ b/Tools/QtBiomeVisualiser/BiomeView.cpp
@@ -1,8 +1,8 @@
 #include "Globals.h"
 #include "BiomeView.h"
-#include "QtChunk.h"
 #include <QPainter>
 #include <QResizeEvent>
+#include "Region.h"
 
 
 
@@ -14,6 +14,116 @@ static const int DELTA_STEP = 120;  // The normal per-notch wheel delta
 
 
 
+/** Map for converting biome values to colors. Initialized from biomeColors[]. */
+static uchar biomeToColor[256 * 4];
+
+/** Map for converting biome values to colors. Used to initialize biomeToColor[].*/
+static struct
+{
+	EMCSBiome m_Biome;
+	uchar m_Color[3];
+} biomeColors[] =
+{
+	{ biOcean,                { 0x00, 0x00, 0x70 }, },
+	{ biPlains,               { 0x8d, 0xb3, 0x60 }, },
+	{ biDesert,               { 0xfa, 0x94, 0x18 }, },
+	{ biExtremeHills,         { 0x60, 0x60, 0x60 }, },
+	{ biForest,               { 0x05, 0x66, 0x21 }, },
+	{ biTaiga,                { 0x0b, 0x66, 0x59 }, },
+	{ biSwampland,            { 0x2f, 0xff, 0xda }, },
+	{ biRiver,                { 0x30, 0x30, 0xaf }, },
+	{ biHell,                 { 0x7f, 0x00, 0x00 }, },
+	{ biSky,                  { 0x00, 0x7f, 0xff }, },
+	{ biFrozenOcean,          { 0xa0, 0xa0, 0xdf }, },
+	{ biFrozenRiver,          { 0xa0, 0xa0, 0xff }, },
+	{ biIcePlains,            { 0xff, 0xff, 0xff }, },
+	{ biIceMountains,         { 0xa0, 0xa0, 0xa0 }, },
+	{ biMushroomIsland,       { 0xff, 0x00, 0xff }, },
+	{ biMushroomShore,        { 0xa0, 0x00, 0xff }, },
+	{ biBeach,                { 0xfa, 0xde, 0x55 }, },
+	{ biDesertHills,          { 0xd2, 0x5f, 0x12 }, },
+	{ biForestHills,          { 0x22, 0x55, 0x1c }, },
+	{ biTaigaHills,           { 0x16, 0x39, 0x33 }, },
+	{ biExtremeHillsEdge,     { 0x7f, 0x8f, 0x7f }, },
+	{ biJungle,               { 0x53, 0x7b, 0x09 }, },
+	{ biJungleHills,          { 0x2c, 0x42, 0x05 }, },
+
+	{ biJungleEdge,           { 0x62, 0x8b, 0x17 }, },
+	{ biDeepOcean,            { 0x00, 0x00, 0x30 },	},
+	{ biStoneBeach,           { 0xa2, 0xa2, 0x84 },	},
+	{ biColdBeach,            { 0xfa, 0xf0, 0xc0 },	},
+	{ biBirchForest,          { 0x30, 0x74, 0x44 },	},
+	{ biBirchForestHills,     { 0x1f, 0x5f, 0x32 },	},
+	{ biRoofedForest,         { 0x40, 0x51, 0x1a },	},
+	{ biColdTaiga,            { 0x31, 0x55, 0x4a },	},
+	{ biColdTaigaHills,       { 0x59, 0x7d, 0x72 },	},
+	{ biMegaTaiga,            { 0x59, 0x66, 0x51 },	},
+	{ biMegaTaigaHills,       { 0x59, 0x66, 0x59 },	},
+	{ biExtremeHillsPlus,     { 0x50, 0x70, 0x50 },	},
+	{ biSavanna,              { 0xbd, 0xb2, 0x5f },	},
+	{ biSavannaPlateau,       { 0xa7, 0x9d, 0x64 },	},
+	{ biMesa,                 { 0xd9, 0x45, 0x15 },	},
+	{ biMesaPlateauF,         { 0xb0, 0x97, 0x65 },	},
+	{ biMesaPlateau,          { 0xca, 0x8c, 0x65 },	},
+
+	// M variants:
+	{ biSunflowerPlains,      { 0xb5, 0xdb, 0x88 }, },
+	{ biDesertM,              { 0xff, 0xbc, 0x40 }, },
+	{ biExtremeHillsM,        { 0x88, 0x88, 0x88 }, },
+	{ biFlowerForest,         { 0x2d, 0x8e, 0x49 }, },
+	{ biTaigaM,               { 0x33, 0x8e, 0x81 }, },
+	{ biSwamplandM,           { 0x07, 0xf9, 0xb2 }, },
+	{ biIcePlainsSpikes,      { 0xb4, 0xdc, 0xdc }, },
+	{ biJungleM,              { 0x7b, 0xa3, 0x31 }, },
+	{ biJungleEdgeM,          { 0x62, 0x8b, 0x17 }, },
+	{ biBirchForestM,         { 0x58, 0x9c, 0x6c }, },
+	{ biBirchForestHillsM,    { 0x47, 0x87, 0x5a }, },
+	{ biRoofedForestM,        { 0x68, 0x79, 0x42 }, },
+	{ biColdTaigaM,           { 0x24, 0x3f, 0x36 }, },
+	{ biMegaSpruceTaiga,      { 0x45, 0x4f, 0x3e }, },
+	{ biMegaSpruceTaigaHills, { 0x45, 0x4f, 0x4e }, },
+	{ biExtremeHillsPlusM,    { 0x78, 0x98, 0x78 }, },
+	{ biSavannaM,             { 0xe5, 0xda, 0x87 }, },
+	{ biSavannaPlateauM,      { 0xa7, 0x9d, 0x74 }, },
+	{ biMesaBryce,            { 0xff, 0x6d, 0x3d }, },
+	{ biMesaPlateauFM,        { 0xd8, 0xbf, 0x8d }, },
+	{ biMesaPlateauM,         { 0xf2, 0xb4, 0x8d }, },
+} ;
+
+
+
+
+
+static class BiomeColorsInitializer
+{
+public:
+	BiomeColorsInitializer(void)
+	{
+		// Reset all colors to gray:
+		for (size_t i = 0; i < ARRAYCOUNT(biomeToColor); i++)
+		{
+			biomeToColor[i] = 0x7f;
+		}
+
+		// Set known biomes to their colors:
+		for (size_t i = 0; i < ARRAYCOUNT(biomeColors); i++)
+		{
+			uchar * color = &biomeToColor[4 * biomeColors[i].m_Biome];
+			color[0] = biomeColors[i].m_Color[2];
+			color[1] = biomeColors[i].m_Color[1];
+			color[2] = biomeColors[i].m_Color[0];
+			color[3] = 0xff;
+		}
+	}
+} biomeColorInitializer;
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// BiomeView:
+
 BiomeView::BiomeView(QWidget * parent) :
 	super(parent),
 	m_X(0),
@@ -40,10 +150,11 @@ BiomeView::BiomeView(QWidget * parent) :
 	redraw();
 
 	// Add a chunk-update callback mechanism:
-	connect(&m_Cache, SIGNAL(chunkAvailable(int, int)), this, SLOT(chunkAvailable(int, int)));
+	connect(&m_Cache, SIGNAL(regionAvailable(int, int)), this, SLOT(regionAvailable(int, int)));
 
-	// Allow keyboard interaction:
+	// Allow mouse and keyboard interaction:
 	setFocusPolicy(Qt::StrongFocus);
+	setMouseTracking(true);
 }
 
 
@@ -80,6 +191,27 @@ void BiomeView::setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource)
 
 
 
+void BiomeView::setPosition(int a_BlockX, int a_BlockZ)
+{
+	m_X = a_BlockX;
+	m_Z = a_BlockZ;
+	redraw();
+}
+
+
+
+
+
+void BiomeView::setZoomLevel(double a_ZoomLevel)
+{
+	m_Zoom = a_ZoomLevel;
+	redraw();
+}
+
+
+
+
+
 void BiomeView::redraw()
 {
 	if (!hasData())
@@ -121,9 +253,15 @@ void BiomeView::redraw()
 
 
 
-void BiomeView::chunkAvailable(int a_ChunkX, int a_ChunkZ)
+void BiomeView::regionAvailable(int a_RegionX, int a_RegionZ)
 {
-	drawChunk(a_ChunkX, a_ChunkZ);
+	for (int z = 0; z < 32; z++)
+	{
+		for (int x = 0; x < 32; x++)
+		{
+			drawChunk(a_RegionX * 32 + x, a_RegionZ * 32 + z);
+		}
+	}
 	update();
 }
 
@@ -153,8 +291,11 @@ void BiomeView::drawChunk(int a_ChunkX, int a_ChunkZ)
 		return;
 	}
 
-	//fetch the chunk:
-	ChunkPtr chunk = m_Cache.fetch(a_ChunkX, a_ChunkZ);
+	// Fetch the region:
+	int regionX;
+	int regionZ;
+	Region::chunkToRegion(a_ChunkX, a_ChunkZ, regionX, regionZ);
+	RegionPtr region = m_Cache.fetch(regionX, regionZ);
 
 	// Figure out where on the screen this chunk should be drawn:
 	// first find the center chunk
@@ -172,11 +313,10 @@ void BiomeView::drawChunk(int a_ChunkX, int a_ChunkZ)
 	centerx += (a_ChunkX - centerchunkx) * chunksize;
 	centery += (a_ChunkZ - centerchunkz) * chunksize;
 
-	int srcoffset = 0;
 	uchar * bits = m_Image.bits();
 	int imgstride = m_Image.bytesPerLine();
 
-	int skipx = 0,skipy = 0;
+	int skipx = 0, skipy = 0;
 	int blockwidth = chunksize, blockheight = chunksize;
 	// now if we're off the screen we need to crop
 	if (centerx < 0)
@@ -205,29 +345,52 @@ void BiomeView::drawChunk(int a_ChunkX, int a_ChunkZ)
 	int imgoffset = centerx * 4 + centery * imgstride;
 
 	// If the chunk is valid, use its data; otherwise use the empty placeholder:
-	const uchar * src = m_EmptyChunkImage;
-	if (chunk.get() != nullptr)
+	const short * src = m_EmptyChunkBiomes;
+	if (region.get() != nullptr)
 	{
-		src = chunk->getImage();
+		int relChunkX = a_ChunkX - regionX * 32;
+		int relChunkZ = a_ChunkZ - regionZ * 32;
+		Chunk & chunk = region->getRelChunk(relChunkX, relChunkZ);
+		if (chunk.isValid())
+		{
+			src = chunk.getBiomes();
+		}
 	}
 
-	// Blit or scale-blit the image:
+	// Scale-blit the image:
 	for (int z = skipy; z < blockheight; z++, imgoffset += imgstride)
 	{
-		srcoffset = floor((double)z / m_Zoom) * 16 * 4;
-		if (m_Zoom == 1.0)
-		{
-			memcpy(bits + imgoffset, src + srcoffset + skipx * 4, (blockwidth - skipx) * 4);
-		}
-		else
+		size_t srcoffset = static_cast<size_t>(std::floor((double)z / m_Zoom)) * 16;
+		int imgxoffset = imgoffset;
+		for (int x = skipx; x < blockwidth; x++)
 		{
-			int xofs = 0;
-			for (int x = skipx; x < blockwidth; x++, xofs +=4)
+			short biome = src[srcoffset + static_cast<size_t>(std::floor((double)x / m_Zoom))];
+			const uchar * color;
+			if (biome < 0)
 			{
-				memcpy(bits + imgoffset + xofs, src + srcoffset + (int)floor((double)x / m_Zoom) * 4, 4);
+				static const uchar emptyBiome1[] = { 0x44, 0x44, 0x44, 0xff };
+				static const uchar emptyBiome2[] = { 0x88, 0x88, 0x88, 0xff };
+				color = ((x & 8) ^ (z & 8)) ? emptyBiome1 : emptyBiome2;
 			}
-		}
-	}
+			else
+			{
+				if (biome * 4 >= ARRAYCOUNT(biomeToColor))
+				{
+					static const uchar errorImage[] = { 0xff, 0x00, 0x00, 0xff };
+					color = errorImage;
+				}
+				else
+				{
+					color = biomeToColor + biome * 4;
+				}
+			}
+			bits[imgxoffset]     = color[0];
+			bits[imgxoffset + 1] = color[1];
+			bits[imgxoffset + 2] = color[2];
+			bits[imgxoffset + 3] = color[3];
+			imgxoffset += 4;
+		}  // for x
+	}  // for z
 }
 
 
@@ -275,6 +438,12 @@ void BiomeView::mousePressEvent(QMouseEvent * a_Event)
 
 void BiomeView::mouseMoveEvent(QMouseEvent * a_Event)
 {
+	// If there's no data displayed, bail out:
+	if (!hasData())
+	{
+		return;
+	}
+
 	if (m_IsMouseDragging)
 	{
 		// The user is dragging the mouse, move the view around:
@@ -286,7 +455,16 @@ void BiomeView::mouseMoveEvent(QMouseEvent * a_Event)
 		return;
 	}
 
-	// TODO: Update the status bar info for the biome currently pointed at
+	// Update the status bar info text:
+	int blockX = floor((a_Event->x() - width()  / 2) / m_Zoom + m_X);
+	int blockZ = floor((a_Event->y() - height() / 2) / m_Zoom + m_Z);
+	int regionX, regionZ;
+	Region::blockToRegion(blockX, blockZ, regionX, regionZ);
+	int relX = blockX - regionX * 512;
+	int relZ = blockZ - regionZ * 512;
+	auto region = m_Cache.fetch(regionX, regionZ);
+	int biome = (region.get() != nullptr) ? region->getRelBiome(relX, relZ) : biInvalidBiome;
+	emit hoverChanged(blockX, blockZ, biome);
 }
 
 
@@ -307,12 +485,12 @@ void BiomeView::wheelEvent(QWheelEvent * a_Event)
 	m_MouseWheelDelta += a_Event->delta();
 	while (m_MouseWheelDelta >= DELTA_STEP)
 	{
-		increaseZoom();
+		emit wheelUp();
 		m_MouseWheelDelta -= DELTA_STEP;
 	}
 	while (m_MouseWheelDelta <= -DELTA_STEP)
 	{
-		decreaseZoom();
+		emit wheelDown();
 		m_MouseWheelDelta += DELTA_STEP;
 	}
 }
@@ -360,14 +538,14 @@ void BiomeView::keyPressEvent(QKeyEvent * a_Event)
 		case Qt::Key_PageUp:
 		case Qt::Key_Q:
 		{
-			increaseZoom();
+			emit increaseZoom();
 			break;
 		}
 
 		case Qt::Key_PageDown:
 		case Qt::Key_E:
 		{
-			decreaseZoom();
+			emit decreaseZoom();
 			break;
 		}
 	}
@@ -376,52 +554,3 @@ void BiomeView::keyPressEvent(QKeyEvent * a_Event)
 
 
 
-
-void BiomeView::decreaseZoom()
-{
-	if (m_Zoom > 1.001)
-	{
-		m_Zoom--;
-		if (m_Zoom < 1.0)
-		{
-			// Just crossed the 100%, fixate the 100% threshold:
-			m_Zoom = 1.0;
-		}
-	}
-	else if (m_Zoom > 0.01)
-	{
-		m_Zoom = m_Zoom / 2;
-	}
-	redraw();
-}
-
-
-
-
-
-void BiomeView::increaseZoom()
-{
-	if (m_Zoom > 0.99)
-	{
-		if (m_Zoom > 20.0)
-		{
-			// Zoom too large
-			return;
-		}
-		m_Zoom++;
-	}
-	else
-	{
-		m_Zoom = m_Zoom * 2;
-		if (m_Zoom > 1.0)
-		{
-			// Just crossed the 100%, fixate the 100% threshold:
-			m_Zoom = 1.0;
-		}
-	}
-	redraw();
-}
-
-
-
-
diff --git a/Tools/QtBiomeVisualiser/BiomeView.h b/Tools/QtBiomeVisualiser/BiomeView.h
index f0521571d..cd9c7ead9 100644
--- a/Tools/QtBiomeVisualiser/BiomeView.h
+++ b/Tools/QtBiomeVisualiser/BiomeView.h
@@ -2,7 +2,7 @@
 
 #include <QWidget>
 #include <memory>
-#include "ChunkCache.h"
+#include "RegionCache.h"
 #include "ChunkSource.h"
 
 
@@ -25,14 +25,34 @@ public:
 	The entire view is then invalidated and regenerated. */
 	void setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource);
 
+	/** Sets the position of the central pixel of the map to the specified point and redraws the view. */
+	void setPosition(int a_BlockX, int a_BlockZ);
+
+	/** Sets the zoom level to the specified value and redraws the view. */
+	void setZoomLevel(double a_ZoomLevel);
+
 signals:
+	/** Signalled when the user uses the wheel to scroll upwards. */
+	void wheelUp();
+
+	/** Signalled when the user uses the wheel to scroll downwards. */
+	void wheelDown();
+
+	/** Signalled when the user presses a key to increase zoom. */
+	void increaseZoom();
+
+	/** Signalled when the user presses a key to decrease zoom. */
+	void decreaseZoom();
+
+	/** Emitted when the user moves the mouse, to reflect the current block under the cursor. */
+	void hoverChanged(int a_BlockX, int a_BlockZ, int a_Biome);
 
 public slots:
 	/** Redraw the entire widget area. */
 	void redraw();
 
-	/** A specified chunk has become available, redraw it. */
-	void chunkAvailable(int a_ChunkX, int a_ChunkZ);
+	/** A specified region has become available, redraw it. */
+	void regionAvailable(int a_RegionX, int a_RegionZ);
 
 	/** Reloads the current chunk source and redraws the entire workspace. */
 	void reload();
@@ -42,7 +62,7 @@ protected:
 	double m_Zoom;
 
 	/** Cache for the loaded chunk data. */
-	ChunkCache m_Cache;
+	RegionCache m_Cache;
 
 	/** The entire view's contents in an offscreen image. */
 	QImage m_Image;
@@ -59,6 +79,9 @@ protected:
 	/** Data used for rendering a chunk that hasn't been loaded yet */
 	uchar m_EmptyChunkImage[16 * 16 * 4];
 
+	/** Data placeholder for chunks that aren't valid. */
+	short m_EmptyChunkBiomes[16 * 16];
+
 
 	/** Draws the specified chunk into m_Image */
 	void drawChunk(int a_ChunkX, int a_ChunkZ);
@@ -86,12 +109,6 @@ protected:
 
 	/** Called when the user presses a key. */
 	virtual void keyPressEvent(QKeyEvent * a_Event) override;
-
-	/** Decreases the zoom level and queues a redraw. */
-	void decreaseZoom();
-
-	/** Increases the zoom level and queues a redraw. */
-	void increaseZoom();
 };
 
 
diff --git a/Tools/QtBiomeVisualiser/ChunkCache.cpp b/Tools/QtBiomeVisualiser/ChunkCache.cpp
deleted file mode 100644
index 05c267d30..000000000
--- a/Tools/QtBiomeVisualiser/ChunkCache.cpp
+++ /dev/null
@@ -1,126 +0,0 @@
-#include "Globals.h"
-#include "ChunkCache.h"
-#include <QMutexLocker>
-#include <QThreadPool>
-#include "ChunkSource.h"
-#include "ChunkLoader.h"
-
-
-
-
-
-ChunkCache::ChunkCache(QObject * parent) :
-	super(parent)
-{
-	m_Cache.setMaxCost(1024 * 1024 * 1024);  // 1 GiB of memory for the cache
-}
-
-
-
-
-
-ChunkPtr ChunkCache::fetch(int a_ChunkX, int a_ChunkZ)
-{
-	// Retrieve from the cache:
-	quint32 hash = getChunkHash(a_ChunkX, a_ChunkZ);
-	ChunkPtr * res;
-	{
-		QMutexLocker lock(&m_Mtx);
-		res = m_Cache[hash];
-		// If succesful and chunk loaded, return the retrieved value:
-		if ((res != nullptr) && (*res)->isValid())
-		{
-			return *res;
-		}
-	}
-
-	// If the chunk is in cache but not valid, it means it has been already queued for rendering, do nothing now:
-	if (res != nullptr)
-	{
-		return ChunkPtr(nullptr);
-	}
-
-	// There's no such item in the cache, create it now:
-	res = new ChunkPtr(new Chunk);
-	if (res == nullptr)
-	{
-		return ChunkPtr(nullptr);
-	}
-	{
-		QMutexLocker lock(&m_Mtx);
-		m_Cache.insert(hash, res, sizeof(Chunk));
-	}
-
-	// Queue the chunk for rendering:
-	queueChunkRender(a_ChunkX, a_ChunkZ, *res);
-
-	// Return failure, the chunk is not yet rendered:
-	return ChunkPtr(nullptr);
-}
-
-
-
-
-
-void ChunkCache::setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource)
-{
-	// Replace the chunk source:
-	m_ChunkSource = a_ChunkSource;
-
-	// Clear the cache:
-	QMutexLocker lock(&m_Mtx);
-	m_Cache.clear();
-}
-
-
-
-
-
-void ChunkCache::reload()
-{
-	assert(m_ChunkSource.get() != nullptr);
-
-	// Reload the chunk source:
-	m_ChunkSource->reload();
-
-	// Clear the cache:
-	QMutexLocker lock(&m_Mtx);
-	m_Cache.clear();
-}
-
-
-
-
-
-void ChunkCache::gotChunk(int a_ChunkX, int a_ChunkZ)
-{
-	emit chunkAvailable(a_ChunkX, a_ChunkZ);
-}
-
-
-
-
-
-quint32 ChunkCache::getChunkHash(int a_ChunkX, int a_ChunkZ)
-{
-	// Simply join the two coords into a single int
-	// The coords will never be larger than 16-bits, so we can do this safely
-	return (((static_cast<quint32>(a_ChunkX) & 0xffff) << 16) | (static_cast<quint32>(a_ChunkZ) & 0xffff));
-}
-
-
-
-
-
-void ChunkCache::queueChunkRender(int a_ChunkX, int a_ChunkZ, ChunkPtr & a_Chunk)
-{
-	// Create a new loader task:
-	ChunkLoader * loader = new ChunkLoader(a_ChunkX, a_ChunkZ, a_Chunk, m_ChunkSource);
-	connect(loader, SIGNAL(loaded(int, int)), this, SLOT(gotChunk(int, int)));
-
-	QThreadPool::globalInstance()->start(loader);
-}
-
-
-
-
diff --git a/Tools/QtBiomeVisualiser/ChunkLoader.cpp b/Tools/QtBiomeVisualiser/ChunkLoader.cpp
deleted file mode 100644
index 3d0123b23..000000000
--- a/Tools/QtBiomeVisualiser/ChunkLoader.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "Globals.h"
-#include "ChunkLoader.h"
-#include "ChunkSource.h"
-
-
-
-
-
-ChunkLoader::ChunkLoader(int a_ChunkX, int a_ChunkZ, ChunkPtr a_Chunk, ChunkSourcePtr a_ChunkSource) :
-	m_ChunkX(a_ChunkX),
-	m_ChunkZ(a_ChunkZ),
-	m_Chunk(a_Chunk),
-	m_ChunkSource(a_ChunkSource)
-{
-}
-
-
-
-
-
-void ChunkLoader::run()
-{
-	m_ChunkSource->getChunkBiomes(m_ChunkX, m_ChunkZ, m_Chunk);
-	emit loaded(m_ChunkX, m_ChunkZ);
-}
-
-
-
-
diff --git a/Tools/QtBiomeVisualiser/ChunkLoader.h b/Tools/QtBiomeVisualiser/ChunkLoader.h
deleted file mode 100644
index 4d026a45e..000000000
--- a/Tools/QtBiomeVisualiser/ChunkLoader.h
+++ /dev/null
@@ -1,45 +0,0 @@
-#pragma once
-
-#include <QObject>
-#include <QRunnable>
-#include <memory>
-
-
-
-
-// fwd:
-class Chunk;
-typedef std::shared_ptr<Chunk> ChunkPtr;
-
-class ChunkSource;
-typedef std::shared_ptr<ChunkSource> ChunkSourcePtr;
-
-
-
-
-
-class ChunkLoader :
-	public QObject,
-	public QRunnable
-{
-	Q_OBJECT
-
-public:
-	ChunkLoader(int a_ChunkX, int a_ChunkZ, ChunkPtr a_Chunk, ChunkSourcePtr a_ChunkSource);
-	virtual ~ChunkLoader() {}
-
-signals:
-	void loaded(int a_ChunkX, int a_ChunkZ);
-
-protected:
-	virtual void run() override;
-
-private:
-	int m_ChunkX, m_ChunkZ;
-	ChunkPtr m_Chunk;
-	ChunkSourcePtr m_ChunkSource;
-};
-
-
-
-
diff --git a/Tools/QtBiomeVisualiser/ChunkSource.cpp b/Tools/QtBiomeVisualiser/ChunkSource.cpp
index bebf89a0a..ea3346f04 100644
--- a/Tools/QtBiomeVisualiser/ChunkSource.cpp
+++ b/Tools/QtBiomeVisualiser/ChunkSource.cpp
@@ -4,177 +4,89 @@
 #include "src/Generating/BioGen.h"
 #include "src/StringCompression.h"
 #include "src/WorldStorage/FastNBT.h"
-#include "inifile/iniFile.h"
+#include "src/IniFile.h"
 
 
 
 
 
-/** Map for converting biome values to colors. Initialized from biomeColors[]. */
-static uchar biomeToColor[256 * 4];
+////////////////////////////////////////////////////////////////////////////////
+// BioGenSource:
 
-/** Map for converting biome values to colors. Used to initialize biomeToColor[].*/
-static struct
-{
-	EMCSBiome m_Biome;
-	uchar m_Color[3];
-} biomeColors[] =
-{
-	{ biOcean,                { 0x00, 0x00, 0x70 }, },
-	{ biPlains,               { 0x8d, 0xb3, 0x60 }, },
-	{ biDesert,               { 0xfa, 0x94, 0x18 }, },
-	{ biExtremeHills,         { 0x60, 0x60, 0x60 }, },
-	{ biForest,               { 0x05, 0x66, 0x21 }, },
-	{ biTaiga,                { 0x0b, 0x66, 0x59 }, },
-	{ biSwampland,            { 0x2f, 0xff, 0xda }, },
-	{ biRiver,                { 0x30, 0x30, 0xaf }, },
-	{ biHell,                 { 0x7f, 0x00, 0x00 }, },
-	{ biSky,                  { 0x00, 0x7f, 0xff }, },
-	{ biFrozenOcean,          { 0xa0, 0xa0, 0xdf }, },
-	{ biFrozenRiver,          { 0xa0, 0xa0, 0xff }, },
-	{ biIcePlains,            { 0xff, 0xff, 0xff }, },
-	{ biIceMountains,         { 0xa0, 0xa0, 0xa0 }, },
-	{ biMushroomIsland,       { 0xff, 0x00, 0xff }, },
-	{ biMushroomShore,        { 0xa0, 0x00, 0xff }, },
-	{ biBeach,                { 0xfa, 0xde, 0x55 }, },
-	{ biDesertHills,          { 0xd2, 0x5f, 0x12 }, },
-	{ biForestHills,          { 0x22, 0x55, 0x1c }, },
-	{ biTaigaHills,           { 0x16, 0x39, 0x33 }, },
-	{ biExtremeHillsEdge,     { 0x7f, 0x8f, 0x7f }, },
-	{ biJungle,               { 0x53, 0x7b, 0x09 }, },
-	{ biJungleHills,          { 0x2c, 0x42, 0x05 }, },
-
-	{ biJungleEdge,           { 0x62, 0x8b, 0x17 }, },
-	{ biDeepOcean,            { 0x00, 0x00, 0x30 },	},
-	{ biStoneBeach,           { 0xa2, 0xa2, 0x84 },	},
-	{ biColdBeach,            { 0xfa, 0xf0, 0xc0 },	},
-	{ biBirchForest,          { 0x30, 0x74, 0x44 },	},
-	{ biBirchForestHills,     { 0x1f, 0x5f, 0x32 },	},
-	{ biRoofedForest,         { 0x40, 0x51, 0x1a },	},
-	{ biColdTaiga,            { 0x31, 0x55, 0x4a },	},
-	{ biColdTaigaHills,       { 0x59, 0x7d, 0x72 },	},
-	{ biMegaTaiga,            { 0x59, 0x66, 0x51 },	},
-	{ biMegaTaigaHills,       { 0x59, 0x66, 0x59 },	},
-	{ biExtremeHillsPlus,     { 0x50, 0x70, 0x50 },	},
-	{ biSavanna,              { 0xbd, 0xb2, 0x5f },	},
-	{ biSavannaPlateau,       { 0xa7, 0x9d, 0x64 },	},
-	{ biMesa,                 { 0xd9, 0x45, 0x15 },	},
-	{ biMesaPlateauF,         { 0xb0, 0x97, 0x65 },	},
-	{ biMesaPlateau,          { 0xca, 0x8c, 0x65 },	},
-
-	// M variants:
-	{ biSunflowerPlains,      { 0xb5, 0xdb, 0x88 }, },
-	{ biDesertM,              { 0xff, 0xbc, 0x40 }, },
-	{ biExtremeHillsM,        { 0x88, 0x88, 0x88 }, },
-	{ biFlowerForest,         { 0x2d, 0x8e, 0x49 }, },
-	{ biTaigaM,               { 0x33, 0x8e, 0x81 }, },
-	{ biSwamplandM,           { 0x07, 0xf9, 0xb2 }, },
-	{ biIcePlainsSpikes,      { 0xb4, 0xdc, 0xdc }, },
-	{ biJungleM,              { 0x7b, 0xa3, 0x31 }, },
-	{ biJungleEdgeM,          { 0x62, 0x8b, 0x17 }, },
-	{ biBirchForestM,         { 0x58, 0x9c, 0x6c }, },
-	{ biBirchForestHillsM,    { 0x47, 0x87, 0x5a }, },
-	{ biRoofedForestM,        { 0x68, 0x79, 0x42 }, },
-	{ biColdTaigaM,           { 0x24, 0x3f, 0x36 }, },
-	{ biMegaSpruceTaiga,      { 0x45, 0x4f, 0x3e }, },
-	{ biMegaSpruceTaigaHills, { 0x45, 0x4f, 0x4e }, },
-	{ biExtremeHillsPlusM,    { 0x78, 0x98, 0x78 }, },
-	{ biSavannaM,             { 0xe5, 0xda, 0x87 }, },
-	{ biSavannaPlateauM,      { 0xa7, 0x9d, 0x74 }, },
-	{ biMesaBryce,            { 0xff, 0x6d, 0x3d }, },
-	{ biMesaPlateauFM,        { 0xd8, 0xbf, 0x8d }, },
-	{ biMesaPlateauM,         { 0xf2, 0xb4, 0x8d }, },
-} ;
-
-
-
-
-
-static class BiomeColorsInitializer
+BioGenSource::BioGenSource(cIniFilePtr a_IniFile) :
+	m_IniFile(a_IniFile),
+	m_Mtx(QMutex::Recursive)
 {
-public:
-	BiomeColorsInitializer(void)
-	{
-		// Reset all colors to gray:
-		for (size_t i = 0; i < ARRAYCOUNT(biomeToColor); i++)
-		{
-			biomeToColor[i] = 0x7f;
-		}
-
-		// Set known biomes to their colors:
-		for (size_t i = 0; i < ARRAYCOUNT(biomeColors); i++)
-		{
-			uchar * color = &biomeToColor[4 * biomeColors[i].m_Biome];
-			color[0] = biomeColors[i].m_Color[2];
-			color[1] = biomeColors[i].m_Color[1];
-			color[2] = biomeColors[i].m_Color[0];
-			color[3] = 0xff;
-		}
-	}
-} biomeColorInitializer;
+	reload();
+}
 
 
 
 
 
-/** Converts biomes in an array into the chunk image data. */
-static void biomesToImage(cChunkDef::BiomeMap & a_Biomes, Chunk::Image & a_Image)
+void BioGenSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, Chunk & a_DestChunk)
 {
-	// Make sure the two arrays are of the same size, compile-time.
-	// Note that a_Image is actually 4 items per pixel, so the array is 4 times bigger:
-	static const char Check1[4 * ARRAYCOUNT(a_Biomes) - ARRAYCOUNT(a_Image)      + 1] = {};
-	static const char Check2[ARRAYCOUNT(a_Image)      - 4 * ARRAYCOUNT(a_Biomes) + 1] = {};
-
-	// Convert the biomes into color:
-	for (size_t i = 0; i < ARRAYCOUNT(a_Biomes); i++)
-	{
-		a_Image[4 * i + 0] = biomeToColor[4 * a_Biomes[i] + 0];
-		a_Image[4 * i + 1] = biomeToColor[4 * a_Biomes[i] + 1];
-		a_Image[4 * i + 2] = biomeToColor[4 * a_Biomes[i] + 2];
-		a_Image[4 * i + 3] = biomeToColor[4 * a_Biomes[i] + 3];
-	}
+	cChunkDef::BiomeMap biomes;
+	int tag;
+	cBiomeGenPtr biomeGen = getBiomeGen(tag);
+	biomeGen->GenBiomes(a_ChunkX, a_ChunkZ, biomes);
+	releaseBiomeGen(std::move(biomeGen), tag);
+	a_DestChunk.setBiomes(biomes);
 }
 
 
 
 
 
-////////////////////////////////////////////////////////////////////////////////
-// BioGenSource:
-
-BioGenSource::BioGenSource(cIniFilePtr a_IniFile) :
-	m_IniFile(a_IniFile),
-	m_Mtx(QMutex::Recursive)
+void BioGenSource::reload()
 {
-	reload();
+	QMutexLocker lock(&m_Mtx);
+	m_CurrentTag += 1;
+	m_BiomeGens.clear();
 }
 
 
 
 
 
-void BioGenSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk)
+cBiomeGenPtr BioGenSource::getBiomeGen(int & a_Tag)
 {
-	cChunkDef::BiomeMap biomes;
+	QMutexLocker lock(&m_Mtx);
+	a_Tag = m_CurrentTag;
+	if (m_BiomeGens.empty())
 	{
-		QMutexLocker lock(&m_Mtx);
-		m_BiomeGen->GenBiomes(a_ChunkX, a_ChunkZ, biomes);
+		// Create a new biogen:
+		lock.unlock();
+		int seed = m_IniFile->GetValueSetI("Seed", "Seed", 0);
+		bool unused;
+		cBiomeGenPtr res = cBiomeGen::CreateBiomeGen(*m_IniFile, seed, unused);
+		return res;
+	}
+	else
+	{
+		// Return an existing biogen:
+		cBiomeGenPtr res = m_BiomeGens.back();
+		m_BiomeGens.pop_back();
+		return res;
 	}
-	Chunk::Image img;
-	biomesToImage(biomes, img);
-	a_DestChunk->setImage(img);
 }
 
 
 
 
 
-void BioGenSource::reload()
+void BioGenSource::releaseBiomeGen(cBiomeGenPtr && a_BiomeGen, int a_Tag)
 {
-	int seed = m_IniFile->GetValueSetI("Generator", "Seed", 0);
-	bool unused = false;
 	QMutexLocker lock(&m_Mtx);
-	m_BiomeGen.reset(cBiomeGen::CreateBiomeGen(*m_IniFile, seed, unused));
+
+	// If the tag differs, the source has been reloaded and this biogen is old, dispose:
+	if (a_Tag != m_CurrentTag)
+	{
+		return;
+	}
+
+	// The tag is the same, put the biogen back to list:
+	m_BiomeGens.push_back(std::move(a_BiomeGen));
 }
 
 
@@ -291,7 +203,7 @@ AnvilSource::AnvilSource(QString a_WorldRegionFolder) :
 
 
 
-void AnvilSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk)
+void AnvilSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, Chunk & a_DestChunk)
 {
 	// Load the compressed data:
 	AString compressedChunkData = getCompressedChunkData(a_ChunkX, a_ChunkZ);
@@ -331,10 +243,7 @@ void AnvilSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChun
 		{
 			biomeMap[i] = (EMCSBiome)GetBEInt(beBiomes + 4 * i);
 		}
-		// Render the biomes:
-		Chunk::Image img;
-		biomesToImage(biomeMap, img);
-		a_DestChunk->setImage(img);
+		a_DestChunk.setBiomes(biomeMap);
 		return;
 	}
 
@@ -350,10 +259,7 @@ void AnvilSource::getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChun
 	{
 		biomeMap[i] = EMCSBiome(vanillaBiomes[i]);
 	}
-	// Render the biomes:
-	Chunk::Image img;
-	biomesToImage(biomeMap, img);
-	a_DestChunk->setImage(img);
+	a_DestChunk.setBiomes(biomeMap);
 }
 
 
@@ -397,7 +303,7 @@ AnvilSource::AnvilFilePtr AnvilSource::getAnvilFile(int a_ChunkX, int a_ChunkZ)
 
 	// Search the cache for the file:
 	QMutexLocker lock(&m_Mtx);
-	for (auto itr = m_Files.cbegin(), end = m_Files.cend(); itr != end; ++itr)
+	for (auto itr = m_Files.begin(), end = m_Files.end(); itr != end; ++itr)
 	{
 		if (((*itr)->m_RegionX == RegionX) && ((*itr)->m_RegionZ == RegionZ))
 		{
diff --git a/Tools/QtBiomeVisualiser/ChunkSource.h b/Tools/QtBiomeVisualiser/ChunkSource.h
index 7bd1865ff..62f9b5626 100644
--- a/Tools/QtBiomeVisualiser/ChunkSource.h
+++ b/Tools/QtBiomeVisualiser/ChunkSource.h
@@ -10,7 +10,7 @@
 
 // fwd:
 class cBiomeGen;
-typedef std::shared_ptr<cBiomeGen> cBiomeGenPtr;
+typedef SharedPtr<cBiomeGen> cBiomeGenPtr;
 class cIniFile;
 typedef std::shared_ptr<cIniFile> cIniFilePtr;
 
@@ -26,7 +26,7 @@ public:
 
 	/** Fills the a_DestChunk with the biomes for the specified coords.
 	It is expected to be thread-safe and re-entrant. Usually QThread::idealThreadCount() threads are used. */
-	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk) = 0;
+	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, Chunk & a_DestChunk) = 0;
 
 	/** Forces a fresh reload of the source. Useful mainly for the generator, whose underlying definition file may have been changed. */
 	virtual void reload() = 0;
@@ -45,7 +45,7 @@ public:
 	BioGenSource(cIniFilePtr a_IniFile);
 
 	// ChunkSource overrides:
-	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk) override;
+	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, Chunk & a_DestChunk) override;
 	virtual void reload(void) override;
 
 protected:
@@ -53,10 +53,30 @@ protected:
 	cIniFilePtr m_IniFile;
 
 	/** The generator used for generating biomes. */
-	std::unique_ptr<cBiomeGen> m_BiomeGen;
+	std::vector<cBiomeGenPtr> m_BiomeGens;
 
-	/** Guards m_BiomeGen against multithreaded access. */
+	/** Guards m_BiomeGens against multithreaded access. */
 	QMutex m_Mtx;
+
+	/** Keeps track of the current settings of the biomegens.
+	Incremented by one each time reload() is called. Provides the means of releasing old biomegens that were
+	in use while reload() was being processed and thus couldn't be changed back then. releaseBiomeGen() does
+	the job of filtering the biogens before reusing them. */
+	int m_CurrentTag;
+
+
+	/** Retrieves one cBiomeGenPtr from m_BiomeGens.
+	If there's no biogen available there, creates a new one based on the ini file.
+	When done with it, the caller should call releaseBiomeGen() to put the biogen back to m_BiomeGens.
+	a_Tag receives the value of m_CurrentTag from when the lock was held; it should be passed to
+	releaseBiomeGen() together with the biogen. */
+	cBiomeGenPtr getBiomeGen(int & a_Tag);
+
+	/** Marks the specified biogen as available for reuse (puts it back into m_BiomeGens).
+	a_Tag is the value of m_CurrentTag from the time when the biogen was retrieved; if it is different from
+	current m_CurrentTagValue, the biogen will be disposed of (because reload() has been called in the
+	meantime). */
+	void releaseBiomeGen(cBiomeGenPtr && a_BiomeGen, int a_Tag);
 };
 
 
@@ -70,7 +90,7 @@ public:
 	AnvilSource(QString a_WorldRegionFolder);
 
 	// ChunkSource overrides:
-	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, ChunkPtr a_DestChunk) override;
+	virtual void getChunkBiomes(int a_ChunkX, int a_ChunkZ, Chunk & a_DestChunk) override;
 	virtual void reload() override;
 
 protected:
diff --git a/Tools/QtBiomeVisualiser/GeneratorSetup.cpp b/Tools/QtBiomeVisualiser/GeneratorSetup.cpp
index f5412404c..8f97e1f37 100644
--- a/Tools/QtBiomeVisualiser/GeneratorSetup.cpp
+++ b/Tools/QtBiomeVisualiser/GeneratorSetup.cpp
@@ -3,7 +3,7 @@
 #include <QLabel>
 #include <QLineEdit>
 #include "src/Generating/BioGen.h"
-#include "inifile/iniFile.h"
+#include "src/IniFile.h"
 
 
 
@@ -14,6 +14,8 @@ static const QString s_GeneratorNames[] =
 	QString("Checkerboard"),
 	QString("Constant"),
 	QString("DistortedVoronoi"),
+	QString("Grown"),
+	QString("GrownProt"),
 	QString("MultiStepMap"),
 	QString("TwoLevel"),
 	QString("Voronoi"),
@@ -31,6 +33,7 @@ GeneratorSetup::GeneratorSetup(const AString & a_IniFileName, QWidget * a_Parent
 	m_eSeed = new QLineEdit();
 	m_eSeed->setValidator(new QIntValidator());
 	m_eSeed->setText("0");
+	m_eSeed->setProperty("INI.SectionName", QVariant("Seed"));
 	m_eSeed->setProperty("INI.ItemName", QVariant("Seed"));
 	m_cbGenerator = new QComboBox();
 	m_cbGenerator->setMinimumWidth(120);
@@ -53,17 +56,12 @@ GeneratorSetup::GeneratorSetup(const AString & a_IniFileName, QWidget * a_Parent
 	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")));
-		m_eSeed->setText(QString::number(m_IniFile->GetValueI("Generator", "Seed")));
-	}
-	else
+	if (a_IniFileName.empty() || !m_IniFile->ReadFile(a_IniFileName))
 	{
 		m_IniFile->SetValue("Generator", "Generator", "Composable");
 		m_IniFile->SetValue("Generator", "BiomeGen", m_cbGenerator->currentText().toStdString());
 		bool dummy;
-		delete cBiomeGen::CreateBiomeGen(*m_IniFile, 0, dummy);
+		cBiomeGen::CreateBiomeGen(*m_IniFile, 0, dummy);
 	}
 	updateFromIni();
 
@@ -95,7 +93,7 @@ void GeneratorSetup::generatorChanged(const QString & a_NewName)
 
 	// 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);
+	cBiomeGen::CreateBiomeGen(*m_IniFile, m_Seed, dummy);
 
 	// Read all values from the INI file and put them into the form layout:
 	updateFromIni();
@@ -110,8 +108,9 @@ void GeneratorSetup::generatorChanged(const QString & a_NewName)
 
 void GeneratorSetup::editChanged(const QString & a_NewValue)
 {
-	QString itemName = sender()->property("INI.ItemName").toString();
-	m_IniFile->SetValue("Generator", itemName.toStdString(), a_NewValue.toStdString());
+	QString sectionName = sender()->property("INI.SectionName").toString();
+	QString itemName    = sender()->property("INI.ItemName").toString();
+	m_IniFile->SetValue(sectionName.toStdString(), itemName.toStdString(), a_NewValue.toStdString());
 	emit generatorUpdated();
 }
 
@@ -121,6 +120,7 @@ void GeneratorSetup::editChanged(const QString & a_NewValue)
 
 void GeneratorSetup::updateFromIni()
 {
+	m_eSeed->setText(QString::number(m_IniFile->GetValueI("Seed", "Seed", 0)));
 	int keyID = m_IniFile->FindKey("Generator");
 	if (keyID <= -1)
 	{
@@ -141,6 +141,7 @@ void GeneratorSetup::updateFromIni()
 
 		QLineEdit * edit = new QLineEdit();
 		edit->setText(QString::fromStdString(itemValue));
+		edit->setProperty("INI.SectionName", QVariant("Generator"));
 		edit->setProperty("INI.ItemName", QVariant(QString::fromStdString(itemName)));
 
 		// Remove the generator name prefix from the item name, for clarity purposes:
diff --git a/Tools/QtBiomeVisualiser/Globals.h b/Tools/QtBiomeVisualiser/Globals.h
index 8d2e913b7..e2e9a9970 100644
--- a/Tools/QtBiomeVisualiser/Globals.h
+++ b/Tools/QtBiomeVisualiser/Globals.h
@@ -158,8 +158,17 @@ template class SizeChecker<UInt16, 2>;
 	TypeName(const TypeName &); \
 	void operator =(const TypeName &)
 
+// A macro that is used to mark unused local variables, to avoid pedantic warnings in gcc / clang / MSVC
+// Note that in MSVC it requires the full type of X to be known
+#define UNUSED_VAR(X) (void)(X)
+
 // A macro that is used to mark unused function parameters, to avoid pedantic warnings in gcc
-#define UNUSED(X) (void)(X)
+// Written so that the full type of param needn't be known
+#ifdef _MSC_VER
+	#define UNUSED(X)
+#else
+	#define UNUSED UNUSED_VAR
+#endif
 
 
 
diff --git a/Tools/QtBiomeVisualiser/MainWindow.cpp b/Tools/QtBiomeVisualiser/MainWindow.cpp
index eb45690c1..c6ea8656e 100644
--- a/Tools/QtBiomeVisualiser/MainWindow.cpp
+++ b/Tools/QtBiomeVisualiser/MainWindow.cpp
@@ -7,12 +7,23 @@
 #include <QFileDialog>
 #include <QSettings>
 #include <QDirIterator>
-#include "inifile/iniFile.h"
+#include <QStatusBar>
 #include "ChunkSource.h"
+#include "src/IniFile.h"
 #include "src/Generating/BioGen.h"
 #include "src/StringCompression.h"
 #include "src/WorldStorage/FastNBT.h"
 #include "GeneratorSetup.h"
+#include "RegionLoader.h"
+
+
+
+
+
+const double MainWindow::m_ViewZooms[] =
+{
+	0.0625, 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 24,
+};
 
 
 
@@ -21,11 +32,27 @@
 MainWindow::MainWindow(QWidget * parent) :
 	QMainWindow(parent),
 	m_GeneratorSetup(nullptr),
-	m_LineSeparator(nullptr)
+	m_LineSeparator(nullptr),
+	m_CurrentZoomLevel(2)
 {
 	initMinecraftPath();
 
 	m_BiomeView = new BiomeView();
+	connect(m_BiomeView, SIGNAL(increaseZoom()), this, SLOT(increaseZoom()));
+	connect(m_BiomeView, SIGNAL(decreaseZoom()), this, SLOT(decreaseZoom()));
+	connect(m_BiomeView, SIGNAL(wheelUp()),      this, SLOT(increaseZoom()));
+	connect(m_BiomeView, SIGNAL(wheelDown()),    this, SLOT(decreaseZoom()));
+	m_BiomeView->setZoomLevel(m_ViewZooms[m_CurrentZoomLevel]);
+
+	m_StatusBar = new QStatusBar();
+	this->setStatusBar(m_StatusBar);
+	m_StatusBlockX = new QLabel(tr("X"));
+	m_StatusBlockZ = new QLabel(tr("Z"));
+	m_StatusBiome = new QLabel(tr("B"));
+	m_StatusBar->addPermanentWidget(m_StatusBlockX);
+	m_StatusBar->addPermanentWidget(m_StatusBlockZ);
+	m_StatusBar->addPermanentWidget(m_StatusBiome);
+
 	m_MainLayout = new QHBoxLayout();
 	m_MainLayout->addWidget(m_BiomeView, 1);
 	m_MainLayout->setMenuBar(menuBar());
@@ -36,6 +63,8 @@ MainWindow::MainWindow(QWidget * parent) :
 
 	createActions();
 	createMenus();
+
+	connect(m_BiomeView, SIGNAL(hoverChanged(int, int, int)), this, SLOT(hoverChanged(int, int, int)));
 }
 
 
@@ -44,7 +73,7 @@ MainWindow::MainWindow(QWidget * parent) :
 
 MainWindow::~MainWindow()
 {
-
+	RegionLoader::shutdown();
 }
 
 
@@ -129,6 +158,80 @@ void MainWindow::openVanillaWorld()
 
 
 
+void MainWindow::centerView()
+{
+	m_BiomeView->setPosition(0, 0);
+}
+
+
+
+
+
+void MainWindow::setViewZoom()
+{
+	// The zoom level is stored in the sender action's data, retrieve it:
+	QAction * action = qobject_cast<QAction *>(sender());
+	if (action == nullptr)
+	{
+		return;
+	}
+	m_CurrentZoomLevel = action->data().toInt();
+	double newZoom = m_ViewZooms[m_CurrentZoomLevel];
+	m_BiomeView->setZoomLevel(newZoom);
+	action->setChecked(true);
+}
+
+
+
+
+
+void MainWindow::increaseZoom()
+{
+	// If already at max zoom, bail out:
+	if (m_CurrentZoomLevel >= ARRAYCOUNT(m_ViewZooms) - 1)
+	{
+		return;
+	}
+
+	// Increase the zoom level:
+	m_CurrentZoomLevel += 1;
+	m_actViewZoom[m_CurrentZoomLevel]->setChecked(true);
+	m_BiomeView->setZoomLevel(m_ViewZooms[m_CurrentZoomLevel]);
+}
+
+
+
+
+
+void MainWindow::decreaseZoom()
+{
+	// If already at min zoom, bail out:
+	if (m_CurrentZoomLevel == 0)
+	{
+		return;
+	}
+
+	// Decrease the zoom level:
+	m_CurrentZoomLevel -= 1;
+	m_actViewZoom[m_CurrentZoomLevel]->setChecked(true);
+	m_BiomeView->setZoomLevel(m_ViewZooms[m_CurrentZoomLevel]);
+}
+
+
+
+
+
+void MainWindow::hoverChanged(int a_BlockX, int a_BlockZ, int a_Biome)
+{
+	m_StatusBlockX->setText(tr("X: %1").arg(a_BlockX));
+	m_StatusBlockZ->setText(tr("Z: %1").arg(a_BlockZ));
+	m_StatusBiome->setText (tr("B: %1 (%2)").arg(BiomeToString(a_Biome).c_str()).arg(a_Biome));
+}
+
+
+
+
+
 void MainWindow::initMinecraftPath()
 {
 	#ifdef Q_OS_MAC
@@ -147,6 +250,7 @@ void MainWindow::initMinecraftPath()
 
 void MainWindow::createActions()
 {
+	// Map menu:
 	createWorldActions();
 
 	m_actNewGen = new QAction(tr("&New generator"), this);
@@ -173,6 +277,22 @@ void MainWindow::createActions()
 	m_actExit->setShortcut(tr("Alt+X"));
 	m_actExit->setStatusTip(tr("Exit %1").arg(QApplication::instance()->applicationName()));
 	connect(m_actExit, SIGNAL(triggered()), this, SLOT(close()));
+
+	// View menu:
+	m_actViewCenter = new QAction(tr("&Reset to center"), this);
+	m_actViewCenter->setStatusTip(tr("Scrolls the view back to the map center"));
+	connect(m_actViewCenter, SIGNAL(triggered()), this, SLOT(centerView()));
+
+	QActionGroup * zoomGroup = new QActionGroup(this);
+	for (int i = 0; i < ARRAYCOUNT(m_ViewZooms); i++)
+	{
+		m_actViewZoom[i] = new QAction(tr("&Zoom %1%").arg(std::floor(m_ViewZooms[i] * 100)), this);
+		m_actViewZoom[i]->setCheckable(true);
+		m_actViewZoom[i]->setData(QVariant(i));
+		zoomGroup->addAction(m_actViewZoom[i]);
+		connect(m_actViewZoom[i], SIGNAL(triggered()), this, SLOT(setViewZoom()));
+	}
+	m_actViewZoom[m_CurrentZoomLevel]->setChecked(true);
 }
 
 
@@ -220,11 +340,12 @@ void MainWindow::createWorldActions()
 
 void MainWindow::createMenus()
 {
+	// Map menu:
 	QMenu * file = menuBar()->addMenu(tr("&Map"));
 	file->addAction(m_actNewGen);
 	file->addAction(m_actOpenGen);
 	file->addSeparator();
-	QMenu * worlds = file->addMenu(tr("Open existing"));
+	QMenu * worlds = file->addMenu(tr("Open &existing"));
 	worlds->addActions(m_WorldActions);
 	if (m_WorldActions.empty())
 	{
@@ -235,6 +356,15 @@ void MainWindow::createMenus()
 	file->addAction(m_actReload);
 	file->addSeparator();
 	file->addAction(m_actExit);
+
+	// View menu:
+	QMenu * view = menuBar()->addMenu(tr("&View"));
+	view->addAction(m_actViewCenter);
+	view->addSeparator();
+	for (size_t i = 0; i < ARRAYCOUNT(m_actViewZoom); i++)
+	{
+		view->addAction(m_actViewZoom[i]);
+	}
 }
 
 
diff --git a/Tools/QtBiomeVisualiser/MainWindow.h b/Tools/QtBiomeVisualiser/MainWindow.h
index 6490a937f..27faae7a8 100644
--- a/Tools/QtBiomeVisualiser/MainWindow.h
+++ b/Tools/QtBiomeVisualiser/MainWindow.h
@@ -4,6 +4,7 @@
 #include <QList>
 #include <QMainWindow>
 #include <QHBoxLayout>
+#include <QLabel>
 #include "BiomeView.h"
 
 
@@ -39,13 +40,33 @@ private slots:
 	/** Opens a vanilla world that is specified by the calling action. */
 	void openVanillaWorld();
 
+	/** Moves the view to the map's center. */
+	void centerView();
+
+	/** Sets the zoom level specified in the triggering action. */
+	void setViewZoom();
+
+	/** Sets a zoom level one step larger than current, if allowed. */
+	void increaseZoom();
+
+	/** Sets a zoom level one step smaller than current, if allowed. */
+	void decreaseZoom();
+
+	/** Updates the statusbar for the specified info about the current block under the cursor. */
+	void hoverChanged(int a_BlockX, int a_BlockZ, int a_Biome);
+
 protected:
+	/** The zoom levels */
+	static const double m_ViewZooms[10];
+
 	// Actions:
 	QAction * m_actNewGen;
 	QAction * m_actOpenGen;
 	QAction * m_actOpenWorld;
 	QAction * m_actReload;
 	QAction * m_actExit;
+	QAction * m_actViewCenter;
+	QAction * m_actViewZoom[ARRAYCOUNT(m_ViewZooms)];
 
 	/** List of actions that open the specific vanilla world. */
 	QList<QAction *> m_WorldActions;
@@ -62,9 +83,19 @@ protected:
 	/** The layout for the window. */
 	QHBoxLayout * m_MainLayout;
 
+	/** The status bar that displays the current hover information. */
+	QStatusBar * m_StatusBar;
+
+	QLabel * m_StatusBlockX;
+	QLabel * m_StatusBlockZ;
+	QLabel * m_StatusBiome;
+
 	/** The separator line between biome view and generator setup. */
 	QWidget * m_LineSeparator;
 
+	/** Index into m_ViewZooms[] for the current zoom level. */
+	size_t m_CurrentZoomLevel;
+
 
 	/** Initializes the m_MinecraftPath based on the proper MC path */
 	void initMinecraftPath();
diff --git a/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro b/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro
index 9e5d1303c..9522491a8 100644
--- a/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro
+++ b/Tools/QtBiomeVisualiser/QtBiomeVisualiser.pro
@@ -12,76 +12,86 @@ TARGET = QtBiomeVisualiser
 TEMPLATE = app
 
 
-SOURCES +=\
-		MainWindow.cpp \
-    BiomeView.cpp \
-    ../../src/Generating/BioGen.cpp \
-    ../../src/VoronoiMap.cpp \
-    ../../src/Noise.cpp \
-    ../../src/StringUtils.cpp \
-    ../../src/LoggerListeners.cpp \
-    ../../src/Logger.cpp \
-    ../../lib/inifile/iniFile.cpp \
-    ../../src/OSSupport/File.cpp \
-    ../../src/OSSupport/CriticalSection.cpp \
-    ../../src/OSSupport/IsThread.cpp \
-    ../../src/BiomeDef.cpp \
-    ChunkCache.cpp \
-    ChunkSource.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 \
-    GeneratorSetup.cpp \
-    QtBiomeVisualiser.cpp \
-    QtChunk.cpp
-
-HEADERS  += MainWindow.h \
-		Globals.h \
-		BiomeView.h \
-    ../../src/Generating/BioGen.h \
-    ../../src/VoronoiMap.h \
-    ../../src/Noise.h \
-    ../../src/StringUtils.h \
-    ../../src/LoggerListeners.h \
-    ../../src/Logger.h \
-    ../../lib/inifile/iniFile.h \
-    ../../src/OSSupport/File.h \
-    ../../src/OSSupport/CriticalSection.h \
-    ../../src/OSSupport/IsThread.h \
-    ../../src/BiomeDef.h \
-    ChunkCache.h \
-    ChunkSource.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 \
-    GeneratorSetup.h \
-    QtChunk.h
+SOURCES += \
+	MainWindow.cpp \
+	BiomeView.cpp \
+	../../src/Generating/BioGen.cpp \
+	../../src/VoronoiMap.cpp \
+	../../src/Noise.cpp \
+	../../src/StringUtils.cpp \
+	../../src/LoggerListeners.cpp \
+	../../src/Logger.cpp \
+	../../src/IniFile.cpp \
+	../../src/OSSupport/File.cpp \
+	../../src/OSSupport/CriticalSection.cpp \
+	../../src/OSSupport/IsThread.cpp \
+	../../src/BiomeDef.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 \
+	GeneratorSetup.cpp \
+	QtBiomeVisualiser.cpp \
+	QtChunk.cpp \
+	RegionCache.cpp \
+	Region.cpp \
+	ChunkSource.cpp \
+	RegionLoader.cpp
+
+
+
+HEADERS += \
+	MainWindow.h \
+	QtChunk.h \
+	Globals.h \
+	BiomeView.h \
+	../../src/Generating/BioGen.h \
+	../../src/Generating/IntGen.h \
+	../../src/Generating/ProtIntGen.h \
+	../../src/VoronoiMap.h \
+	../../src/Noise.h \
+	../../src/StringUtils.h \
+	../../src/LoggerListeners.h \
+	../../src/Logger.h \
+	../../src/IniFile.h \
+	../../src/OSSupport/File.h \
+	../../src/OSSupport/CriticalSection.h \
+	../../src/OSSupport/IsThread.h \
+	../../src/BiomeDef.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 \
+	GeneratorSetup.h \
+	QtChunk.h \
+	RegionCache.h \
+	Region.h \
+	ChunkSource.h \
+	RegionLoader.h
+
+
 
 INCLUDEPATH += $$_PRO_FILE_PWD_ \
 	$$_PRO_FILE_PWD_/../../lib \
diff --git a/Tools/QtBiomeVisualiser/QtChunk.cpp b/Tools/QtBiomeVisualiser/QtChunk.cpp
index 80109b2f8..f201ef220 100644
--- a/Tools/QtBiomeVisualiser/QtChunk.cpp
+++ b/Tools/QtBiomeVisualiser/QtChunk.cpp
@@ -14,20 +14,26 @@ Chunk::Chunk() :
 
 
 
-const uchar * Chunk::getImage(void) const
+void Chunk::setBiomes(const cChunkDef::BiomeMap & a_Biomes)
 {
-	ASSERT(m_IsValid);
-	return m_Image;
+	for (size_t idx = 0; idx < ARRAYCOUNT(a_Biomes); ++idx)
+	{
+		m_Biomes[idx] = static_cast<short>(a_Biomes[idx]);
+	}
+	m_IsValid = true;
 }
 
 
 
 
 
-void Chunk::setImage(const Image & a_Image)
+EMCSBiome Chunk::getBiome(int a_RelX, int a_RelZ)
 {
-	memcpy(m_Image, a_Image, sizeof(a_Image));
-	m_IsValid = true;
+	if (!m_IsValid)
+	{
+		return biInvalidBiome;
+	}
+	return static_cast<EMCSBiome>(m_Biomes[a_RelX + 16 * a_RelZ]);
 }
 
 
diff --git a/Tools/QtBiomeVisualiser/QtChunk.h b/Tools/QtBiomeVisualiser/QtChunk.h
index 03e7bd1b3..d806d18bb 100644
--- a/Tools/QtBiomeVisualiser/QtChunk.h
+++ b/Tools/QtBiomeVisualiser/QtChunk.h
@@ -18,18 +18,23 @@ public:
 	/** Returns true iff the chunk data is valid - loaded or generated. */
 	bool isValid(void) const { return m_IsValid; }
 
-	/** Returns the image of the chunk's biomes. Assumes that the chunk is valid. */
-	const uchar * getImage(void) const;
+	/** Sets the biomes to m_Biomes and renders them into m_Image. */
+	void setBiomes(const cChunkDef::BiomeMap & a_Biomes);
 
-	/** Sets the image data for this chunk. */
-	void setImage(const Image & a_Image);
+	/** Returns the biome at the specified relative coords, or biInvalidBiome if not valid.
+	Coords must be valid inside this chunk. */
+	EMCSBiome getBiome(int a_RelX, int a_RelZ);
+
+	/** Returns the raw biome data for this chunk. */
+	const short * getBiomes(void) const { return m_Biomes; }
 
 protected:
 	/** Flag that specifies if the chunk data is valid - loaded or generated. */
 	bool m_IsValid;
 
-	/** Cached rendered image of this chunk's biomes. Updated in render(). */
-	Image m_Image;
+	/** Biomes comprising the chunk, in the X + 16 * Z ordering.
+	Typed as short to save on memory, converted automatically when needed. */
+	short m_Biomes[16 * 16];
 };
 
 typedef std::shared_ptr<Chunk> ChunkPtr;
diff --git a/Tools/QtBiomeVisualiser/Region.cpp b/Tools/QtBiomeVisualiser/Region.cpp
new file mode 100644
index 000000000..d8a0a2f76
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/Region.cpp
@@ -0,0 +1,72 @@
+
+#include "Globals.h"
+#include "Region.h"
+
+
+
+
+
+Region::Region()
+{
+}
+
+
+
+
+
+Chunk & Region::getRelChunk(int a_RelChunkX, int a_RelChunkZ)
+{
+		ASSERT(a_RelChunkX >= 0);
+		ASSERT(a_RelChunkZ >= 0);
+		ASSERT(a_RelChunkX < 32);
+		ASSERT(a_RelChunkZ < 32);
+
+		return m_Chunks[a_RelChunkX + a_RelChunkZ * 32];
+}
+
+
+
+
+
+int Region::getRelBiome(int a_RelBlockX, int a_RelBlockZ)
+{
+	ASSERT(a_RelBlockX >= 0);
+	ASSERT(a_RelBlockZ >= 0);
+	ASSERT(a_RelBlockX < 512);
+	ASSERT(a_RelBlockZ < 512);
+
+	int chunkX = a_RelBlockX / 16;
+	int chunkZ = a_RelBlockZ / 16;
+	Chunk & chunk = m_Chunks[chunkX + 32 * chunkZ];
+	if (chunk.isValid())
+	{
+		return chunk.getBiome(a_RelBlockX - 16 * chunkX, a_RelBlockZ - 16 * chunkZ);
+	}
+	else
+	{
+		return biInvalidBiome;
+	}
+}
+
+
+
+
+void Region::blockToRegion(int a_BlockX, int a_BlockZ, int & a_RegionX, int & a_RegionZ)
+{
+	a_RegionX = static_cast<int>(std::floor(static_cast<float>(a_BlockX) / 512));
+	a_RegionZ = static_cast<int>(std::floor(static_cast<float>(a_BlockZ) / 512));
+}
+
+
+
+
+
+void Region::chunkToRegion(int a_ChunkX, int a_ChunkZ, int & a_RegionX, int & a_RegionZ)
+{
+	a_RegionX = static_cast<int>(std::floor(static_cast<float>(a_ChunkX) / 32));
+	a_RegionZ = static_cast<int>(std::floor(static_cast<float>(a_ChunkZ) / 32));
+}
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/Region.h b/Tools/QtBiomeVisualiser/Region.h
new file mode 100644
index 000000000..863c0ac02
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/Region.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "QtChunk.h"
+
+
+
+
+
+class Region
+{
+public:
+	Region();
+
+	/** Retrieves the chunk with the specified relative coords. */
+	Chunk & getRelChunk(int a_RelChunkX, int a_RelChunkZ);
+
+	/** Returns true iff the chunk data for all chunks has been loaded.
+	This doesn't mean that all the chunks are valid, only that the entire region has been processed and should
+	be displayed. */
+	bool isValid(void) const { return m_IsValid; }
+
+	/** Returns the biome in the block coords relative to this region.
+	Returns biInvalidBiome if the underlying chunk is not valid. */
+	int getRelBiome(int a_RelBlockX, int a_RelBlockZ);
+
+	/** Converts block coordinates into region coordinates. */
+	static void blockToRegion(int a_BlockX, int a_BlockZ, int & a_RegionX, int & a_RegionZ);
+
+	/** Converts chunk coordinates into region coordinates. */
+	static void chunkToRegion(int a_ChunkX, int a_ChunkZ, int & a_RegionX, int & a_RegionZ);
+
+protected:
+	friend class RegionLoader;
+
+
+	Chunk m_Chunks[32 * 32];
+
+	/** True iff the data for all the chunks has been loaded.
+	This doesn't mean that all the chunks are valid, only that the entire region has been processed and should
+	be displayed. */
+	bool m_IsValid;
+};
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/RegionCache.cpp b/Tools/QtBiomeVisualiser/RegionCache.cpp
new file mode 100644
index 000000000..e46fd222a
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/RegionCache.cpp
@@ -0,0 +1,138 @@
+#include "Globals.h"
+#include "RegionCache.h"
+#include <QMutexLocker>
+#include <QThreadPool>
+#include "ChunkSource.h"
+#include "RegionLoader.h"
+#include "Region.h"
+
+
+
+
+
+RegionCache::RegionCache(QObject * parent) :
+	super(parent)
+{
+	m_Cache.setMaxCost(1024 * 1024 * 1024);  // 1 GiB of memory for the cache
+}
+
+
+
+
+
+RegionPtr RegionCache::fetch(int a_RegionX, int a_RegionZ)
+{
+	// Retrieve from the cache:
+	quint32 hash = getRegionHash(a_RegionX, a_RegionZ);
+	RegionPtr * res;
+	{
+		QMutexLocker lock(&m_Mtx);
+		res = m_Cache[hash];
+		// If succesful and region loaded, return the retrieved value:
+		if ((res != nullptr) && (*res)->isValid())
+		{
+			return *res;
+		}
+	}
+
+	// If the region is in cache but not valid, it means it has been already queued for rendering, do nothing now:
+	if (res != nullptr)
+	{
+		return RegionPtr(nullptr);
+	}
+
+	// There's no such item in the cache, create it now:
+	try
+	{
+		res = new RegionPtr(new Region);
+	}
+	catch (const std::bad_alloc &)
+	{
+		/* Allocation failed (32-bit process hit the 2 GiB barrier?)
+		This may happen even with the cache set to 1 GiB, because it contains shared ptrs and so they may be
+		held by another place in the code even when they are removed from cache.
+		*/
+		return RegionPtr(nullptr);
+	}
+	if (res == nullptr)
+	{
+		return RegionPtr(nullptr);
+	}
+	{
+		QMutexLocker lock(&m_Mtx);
+		m_Cache.insert(hash, res, sizeof(Region));
+	}
+
+	// Queue the region for rendering:
+	queueRegionRender(a_RegionX, a_RegionZ, *res);
+
+	// Return failure, the region is not yet rendered:
+	return RegionPtr(nullptr);
+}
+
+
+
+
+
+void RegionCache::setChunkSource(std::shared_ptr<ChunkSource> a_ChunkSource)
+{
+	// Replace the chunk source:
+	m_ChunkSource = a_ChunkSource;
+
+	// Clear the cache:
+	QMutexLocker lock(&m_Mtx);
+	m_Cache.clear();
+}
+
+
+
+
+
+void RegionCache::reload()
+{
+	assert(m_ChunkSource.get() != nullptr);
+
+	// Reload the chunk source:
+	m_ChunkSource->reload();
+
+	// Clear the cache:
+	QMutexLocker lock(&m_Mtx);
+	m_Cache.clear();
+}
+
+
+
+
+
+void RegionCache::gotRegion(int a_RegionX, int a_RegionZ)
+{
+	emit regionAvailable(a_RegionX, a_RegionZ);
+}
+
+
+
+
+
+quint32 RegionCache::getRegionHash(int a_RegionX, int a_RegionZ)
+{
+	// Simply join the two coords into a single int
+	// The coords will never be larger than 16-bits, so we can do this safely
+	return (((static_cast<quint32>(a_RegionX) & 0xffff) << 16) | (static_cast<quint32>(a_RegionZ) & 0xffff));
+}
+
+
+
+
+
+void RegionCache::queueRegionRender(int a_RegionX, int a_RegionZ, RegionPtr & a_Region)
+{
+	// Create a new loader task:
+	RegionLoader * loader = new RegionLoader(a_RegionX, a_RegionZ, a_Region, m_ChunkSource);
+	connect(loader, SIGNAL(loaded(int, int)), this, SLOT(gotRegion(int, int)));
+
+	QThreadPool::globalInstance()->start(loader);
+}
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/ChunkCache.h b/Tools/QtBiomeVisualiser/RegionCache.h
index 8d198f02f..c343e4ba9 100644
--- a/Tools/QtBiomeVisualiser/ChunkCache.h
+++ b/Tools/QtBiomeVisualiser/RegionCache.h
@@ -9,8 +9,9 @@
 
 
 
-class Chunk;
-typedef std::shared_ptr<Chunk> ChunkPtr;
+// fwd:
+class Region;
+typedef std::shared_ptr<Region> RegionPtr;
 
 class ChunkSource;
 
@@ -18,19 +19,19 @@ class ChunkSource;
 
 
 
-/** Caches chunk data for reuse */
-class ChunkCache :
+/** Caches regions' chunk data for reuse */
+class RegionCache :
 	public QObject
 {
 	typedef QObject super;
 	Q_OBJECT
 
 public:
-	explicit ChunkCache(QObject * parent = NULL);
+	explicit RegionCache(QObject * parent = NULL);
 
-	/** Retrieves the specified chunk from the cache.
-	Only returns valid chunks; if the chunk is invalid, queues it for rendering and returns an empty ptr. */
-	ChunkPtr fetch(int a_ChunkX, int a_ChunkZ);
+	/** Retrieves the specified region from the cache.
+	Only returns valid regions; if the region is invalid, queues it for rendering and returns an empty ptr. */
+	RegionPtr fetch(int a_RegionX, int a_RegionZ);
 
 	/** Replaces the chunk source used by the biome view to get the chunk biome data.
 	The cache is then invalidated. */
@@ -43,16 +44,16 @@ public:
 	void reload();
 
 signals:
-	void chunkAvailable(int a_ChunkX, int a_ChunkZ);
+	void regionAvailable(int a_RegionX, int a_RegionZ);
 
 protected slots:
-	void gotChunk(int a_ChunkX, int a_ChunkZ);
+	void gotRegion(int a_RegionX, int a_RegionZ);
 
 protected:
 	/** The cache of the chunks */
-	QCache<quint32, ChunkPtr> m_Cache;
+	QCache<quint32, RegionPtr> m_Cache;
 
-	/** Locks te cache against multithreaded access */
+	/** Locks the cache against multithreaded access */
 	QMutex m_Mtx;
 
 	/** The source used to get the biome data. */
@@ -60,10 +61,10 @@ protected:
 
 
 	/** Returns the hash used by the chunk in the cache */
-	quint32 getChunkHash(int a_ChunkX, int a_ChunkZ);
+	quint32 getRegionHash(int a_RegionX, int a_RegionZ);
 
-	/** Queues the specified chunk for rendering by m_ChunkSource. */
-	void queueChunkRender(int a_ChunkX, int a_ChunkZ, ChunkPtr & a_Chunk);
+	/** Queues the specified region for rendering by m_RegionSource. */
+	void queueRegionRender(int a_RegionX, int a_RegionZ, RegionPtr & a_Region);
 };
 
 
diff --git a/Tools/QtBiomeVisualiser/RegionLoader.cpp b/Tools/QtBiomeVisualiser/RegionLoader.cpp
new file mode 100644
index 000000000..2a318098b
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/RegionLoader.cpp
@@ -0,0 +1,49 @@
+#include "Globals.h"
+#include "RegionLoader.h"
+#include "ChunkSource.h"
+#include "Region.h"
+
+
+
+
+
+volatile bool RegionLoader::m_IsShuttingDown = false;
+
+
+
+
+
+RegionLoader::RegionLoader(int a_RegionX, int a_RegionZ, RegionPtr a_Region, ChunkSourcePtr a_ChunkSource) :
+	m_RegionX(a_RegionX),
+	m_RegionZ(a_RegionZ),
+	m_Region(a_Region),
+	m_ChunkSource(a_ChunkSource)
+{
+}
+
+
+
+
+
+void RegionLoader::run()
+{
+	// Load all the chunks in this region:
+	for (int z = 0; z < 32; z++)
+	{
+		for (int x = 0; x < 32; x++)
+		{
+			m_ChunkSource->getChunkBiomes(m_RegionX * 32 + x, m_RegionZ * 32 + z, m_Region->getRelChunk(x, z));
+			if (m_IsShuttingDown)
+			{
+				return;
+			}
+		}
+	}
+	m_Region->m_IsValid = true;
+
+	emit loaded(m_RegionX, m_RegionZ);
+}
+
+
+
+
diff --git a/Tools/QtBiomeVisualiser/RegionLoader.h b/Tools/QtBiomeVisualiser/RegionLoader.h
new file mode 100644
index 000000000..6bbb4aa60
--- /dev/null
+++ b/Tools/QtBiomeVisualiser/RegionLoader.h
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <QObject>
+#include <QRunnable>
+#include <memory>
+
+
+
+
+// fwd:
+class Region;
+typedef std::shared_ptr<Region> RegionPtr;
+
+class ChunkSource;
+typedef std::shared_ptr<ChunkSource> ChunkSourcePtr;
+
+
+
+
+
+class RegionLoader :
+	public QObject,
+	public QRunnable
+{
+	Q_OBJECT
+
+public:
+	RegionLoader(int a_RegionX, int a_RegionZ, RegionPtr a_Region, ChunkSourcePtr a_ChunkSource);
+	virtual ~RegionLoader() {}
+
+	/** Signals to all loaders that the app is shutting down and the loading should be aborted. */
+	static void shutdown() { m_IsShuttingDown = true; }
+
+signals:
+	void loaded(int a_RegionX, int a_RegionZ);
+
+protected:
+	virtual void run() override;
+
+private:
+	/** Coords of the region to be loaded. */
+	int m_RegionX, m_RegionZ;
+
+	/** The region to be loaded. */
+	RegionPtr m_Region;
+
+	/** The chunk source to be used for individual chunks within the region. */
+	ChunkSourcePtr m_ChunkSource;
+
+	/** Flag that is set upon app exit to terminate the queued loaders faster. */
+	static volatile bool m_IsShuttingDown;
+};
+
+
+
+