examples/Basic/main.cpp

@@ -422,6 +422,39 @@ void createPerlinVolumeFast(Volume<MaterialDensityPair44>& volData)
 	}
 }
 
+void createPerlinTerrain(Volume<MaterialDensityPair44>& volData)
+{
+	Perlin perlin(2,2,1,234);
+
+	for(int x = 1; x < volData.getWidth()-1; x++)
+	{
+		std::cout << x << std::endl;
+		for(int y = 1; y < volData.getHeight()-1; y++)
+		{
+			float perlinVal = perlin.Get(x / static_cast<float>(volData.getHeight()-1), y / static_cast<float>(volData.getDepth()-1));
+			perlinVal += 1.0f;
+			perlinVal *= 0.5f;
+			perlinVal *= volData.getWidth();
+			for(int z = 1; z < volData.getDepth()-1; z++) 
+			{							
+				MaterialDensityPair44 voxel;
+				if(z < perlinVal)
+				{
+					voxel.setMaterial(245);
+					voxel.setDensity(MaterialDensityPair44::getMaxDensity());
+				}
+				else
+				{
+					voxel.setMaterial(0);
+					voxel.setDensity(MaterialDensityPair44::getMinDensity());
+				}
+
+				volData.setVoxelAt(x, y, z, voxel);
+			}
+		}
+	}
+}
+
 void createSphereInVolume(Volume<MaterialDensityPair44>& volData, Vector3DFloat v3dVolCenter, float fRadius)
 {
 	//This vector hold the position of the center of the volume
@@ -469,9 +502,10 @@ int main(int argc, char *argv[])
 	openGLWidget.show();
 
 	//Create an empty volume and then place a sphere in it
-	Volume<MaterialDensityPair44> volData(256, 256, 256);
+	Volume<MaterialDensityPair44> volData(1024, 1280, 256);
 	//createSphereInVolume(volData, 30);
-	createPerlinVolumeFast(volData);
+	createPerlinTerrain(volData);
+	volData.setBlockCacheSize(8);
 
 	/*srand(12345);
 	for(int ct = 0; ct < 1000; ct++)
@@ -487,12 +521,12 @@ int main(int argc, char *argv[])
 	}*/
 
 	//Extract the surface
-	SurfaceMesh<PositionMaterialNormal> mesh;
+	/*SurfaceMesh<PositionMaterialNormal> mesh;
 	CubicSurfaceExtractorWithNormals<MaterialDensityPair44> surfaceExtractor(&volData, volData.getEnclosingRegion(), &mesh);
 	surfaceExtractor.execute();
 
 	//Pass the surface to the OpenGL window
-	openGLWidget.setSurfaceMeshToRender(mesh);
+	openGLWidget.setSurfaceMeshToRender(mesh);*/
 
 	//Run the message pump.
 	return app.exec();

library/PolyVoxCore/include/PolyVoxImpl/Block.h

@@ -64,7 +64,7 @@ namespace PolyVox
 		bool m_bIsUncompressedDataModified;
 		uint64_t m_uTimestamp;
 
-		std::vector<uint8_t> runlengths;
+		std::vector<uint16_t> runlengths;
 		std::vector<VoxelType> values;
 	};
 }

library/PolyVoxCore/include/PolyVoxImpl/Block.inl

@@ -208,6 +208,8 @@ namespace PolyVox
 	template <typename VoxelType>
 	void Block<VoxelType>::compress(void)
 	{
+		assert(m_bIsCompressed == false);
+
 		//If the uncompressed data hasn't actually been
 		//modified then we don't need to redo the compression.
 		if(m_bIsUncompressedDataModified)
@@ -217,12 +219,12 @@ namespace PolyVox
 			values.clear();
 
 			VoxelType current = m_tUncompressedData[0];
-			uint8_t runLength = 1;
+			uint16_t runLength = 1;
 
 			for(uint32_t ct = 1; ct < uNoOfVoxels; ++ct)
 			{		
 				VoxelType value = m_tUncompressedData[ct];
-				if((value == current) && (runLength < (std::numeric_limits<uint8_t>::max)()))
+				if((value == current) && (runLength < (std::numeric_limits<uint16_t>::max)()))
 				{
 					runLength++;
 				}
@@ -245,6 +247,7 @@ namespace PolyVox
 			//std::vector<VoxelType>(values).swap(values);
 		}
 
+		assert(m_tUncompressedData != 0);
 		delete[] m_tUncompressedData;
 		m_tUncompressedData = 0;
 		m_bIsCompressed = true;
@@ -253,6 +256,8 @@ namespace PolyVox
 	template <typename VoxelType>
 	void Block<VoxelType>::uncompress(void)
 	{
+		assert(m_bIsCompressed == true);
+		assert(m_tUncompressedData == 0);
 		m_tUncompressedData = new VoxelType[m_uSideLength * m_uSideLength * m_uSideLength];
 
 		VoxelType* pUncompressedData = m_tUncompressedData;
@@ -261,7 +266,7 @@ namespace PolyVox
 		//on unsigned chars so is only possible if our voxel type is the right size.
 		//Nore that memset takes an int type, but sonverts it to unsiogned char:
 		//http://www.cplusplus.com/reference/clibrary/cstring/memset/
-		if(sizeof(VoxelType) == sizeof(unsigned char))
+		/*if(sizeof(VoxelType) == sizeof(unsigned char))
 		{
 			for(uint32_t ct = 0; ct < runlengths.size(); ++ct)
 			{
@@ -271,7 +276,7 @@ namespace PolyVox
 		}
 		//Otherwise we fall back on a loop.
 		else
-		{
+		{*/
 			for(uint32_t ct = 0; ct < runlengths.size(); ++ct)
 			{
 				for(uint32_t i = 0; i < runlengths[ct]; ++i)
@@ -280,7 +285,7 @@ namespace PolyVox
 					++pUncompressedData;
 				}
 			}
-		}
+		//}
 
 		m_bIsCompressed = false;
 		m_bIsUncompressedDataModified = false;

library/PolyVoxCore/include/Volume.h

@@ -120,7 +120,7 @@ namespace PolyVox
 
 	public:		
 		///Constructor
-		Volume(uint16_t uWidth, uint16_t uHeight, uint16_t uDepth, uint16_t uBlockSideLength = 64);
+		Volume(uint16_t uWidth, uint16_t uHeight, uint16_t uDepth, uint16_t uBlockSideLength = 32);
 		///Destructor
 		~Volume();	
 
@@ -155,12 +155,16 @@ namespace PolyVox
 		///Resizes the volume to the specified dimensions
 		void resize(uint16_t uWidth, uint16_t uHeight, uint16_t uDepth, uint16_t uBlockSideLength = 32);
 
+		void setBlockCacheSize(uint16_t uBlockCacheSize);
+		void clearBlockCache(void);
+
 	public:
 		Block<VoxelType>* getUncompressedBlock(Block<VoxelType>* block) const;
 
 		Block<VoxelType> m_pBorderBlock;
 		std::vector< Block<VoxelType> > m_pBlocks;
 		mutable std::vector<Block<VoxelType>*> m_pUncompressedBlocks;
+		uint16_t m_uBlockCacheSize;
 
 		uint32_t m_uNoOfBlocksInVolume;
 
@@ -179,6 +183,9 @@ namespace PolyVox
 		uint16_t m_uShortestSideLength;
 		float m_fDiagonalLength;
 		mutable uint64_t m_uTimestamper;
+
+		mutable uint32_t m_uCompressions;
+		mutable uint32_t m_uUncompressions;
 	};
 
 	//Some handy typedefs

library/PolyVoxCore/include/Volume.inl

@@ -49,7 +49,13 @@ namespace PolyVox
 	template <typename VoxelType>
 	Volume<VoxelType>::Volume(uint16_t uWidth, uint16_t uHeight, uint16_t uDepth, uint16_t uBlockSideLength)
 		:m_uTimestamper(0)
+		,m_uBlockCacheSize(1024)
+		,m_uCompressions(0)
+		,m_uUncompressions(0)
+		,m_uBlockSideLength(uBlockSideLength)
 	{
+		setBlockCacheSize(m_uBlockCacheSize);
+
 		//Create a volume of the right size.
 		resize(uWidth, uHeight, uDepth, uBlockSideLength);
 	}
@@ -262,6 +268,18 @@ namespace PolyVox
 		return setVoxelAt(v3dPos.getX(), v3dPos.getY(), v3dPos.getZ(), tValue);
 	}
 
+	template <typename VoxelType>
+	void Volume<VoxelType>::clearBlockCache(void)
+	{
+		for(uint32_t ct = 0; ct < m_pUncompressedBlocks.size(); ct++)
+		{
+			m_pUncompressedBlocks[ct]->compress();
+			m_uCompressions++;
+		}
+
+		m_pUncompressedBlocks.clear();
+	}
+
 	////////////////////////////////////////////////////////////////////////////////
 	/// Note: Calling this function will destroy all existing data in the volume.
 	/// \param uWidth The desired width in voxels. This must be a power of two.
@@ -344,6 +362,14 @@ namespace PolyVox
 		m_fDiagonalLength = sqrtf(static_cast<float>(m_uWidth * m_uWidth + m_uHeight * m_uHeight + m_uDepth * m_uDepth));
 	}
 
+	template <typename VoxelType>
+	void Volume<VoxelType>::setBlockCacheSize(uint16_t uBlockCacheSize)
+	{
+		clearBlockCache();
+
+		m_uBlockCacheSize = uBlockCacheSize;
+	}
+
 	template <typename VoxelType>
 	Block<VoxelType>* Volume<VoxelType>::getUncompressedBlock(Block<VoxelType>* block) const
 	{
@@ -354,8 +380,10 @@ namespace PolyVox
 			return block;
 		}
 
-		const uint32_t MaxUncompressedBlocks = 10;
-		if(m_pUncompressedBlocks.size() == MaxUncompressedBlocks)
+		uint32_t uUncompressedBlockIndex = 100000000;
+
+		assert(m_pUncompressedBlocks.size() <= m_uBlockCacheSize);
+		if(m_pUncompressedBlocks.size() == m_uBlockCacheSize)
 		{
 			int32_t leastRecentlyUsedBlockIndex = -1;
 			uint32_t uLeastRecentTimestamp = 1000000000000000;
@@ -369,6 +397,7 @@ namespace PolyVox
 			}
 
 			m_pUncompressedBlocks[leastRecentlyUsedBlockIndex]->compress();
+			m_uCompressions++;
 			m_pUncompressedBlocks[leastRecentlyUsedBlockIndex] = block;
 		}
 		else
@@ -377,6 +406,7 @@ namespace PolyVox
 		}
 
 		block->uncompress();
+		m_uUncompressions++;
 
 		return block;
 	}