From 4c24d6140845c3e88c279f727944c67133b4f5bc Mon Sep 17 00:00:00 2001
From: David Williams <david@volumesoffun.com>
Date: Sun, 5 Apr 2015 12:03:12 +0200
Subject: [PATCH] Added another function for backwards compatibility.

---
 include/PolyVox/PagedVolume.h        |  1 +
 include/PolyVox/PagedVolumeChunk.inl | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/PolyVox/PagedVolume.h b/include/PolyVox/PagedVolume.h
index 35443154..a3eb271d 100644
--- a/include/PolyVox/PagedVolume.h
+++ b/include/PolyVox/PagedVolume.h
@@ -134,6 +134,7 @@ namespace PolyVox
 			void setVoxel(const Vector3DUint16& v3dPos, VoxelType tValue);
 
 			void changeLinearOrderingToMorton(void);
+			void changeMortonOrderingToLinear(void);
 
 		private:
 			/// Private copy constructor to prevent accisdental copying
diff --git a/include/PolyVox/PagedVolumeChunk.inl b/include/PolyVox/PagedVolumeChunk.inl
index d06a21cc..4684c65b 100644
--- a/include/PolyVox/PagedVolumeChunk.inl
+++ b/include/PolyVox/PagedVolumeChunk.inl
@@ -178,4 +178,28 @@ namespace PolyVox
 
 		delete[] pTempBuffer;
 	}
+
+	// Like the above function, this is provided fot easing backwards compatibility. In Cubiquity we have some
+	// old databases which use linear ordering, and we need to continue to save such data in linear order.
+	template <typename VoxelType>
+	void PagedVolume<VoxelType>::Chunk::changeMortonOrderingToLinear(void)
+	{
+		VoxelType* pTempBuffer = new VoxelType[m_uSideLength * m_uSideLength * m_uSideLength];
+		for (uint16_t z = 0; z < m_uSideLength; z++)
+		{
+			for (uint16_t y = 0; y < m_uSideLength; y++)
+			{
+				for (uint16_t x = 0; x < m_uSideLength; x++)
+				{
+					uint32_t uLinearIndex = x + y * m_uSideLength + z * m_uSideLength * m_uSideLength;
+					uint32_t uMortonIndex = morton256_x[x] | morton256_y[y] | morton256_z[z];
+					pTempBuffer[uLinearIndex] = m_tData[uMortonIndex];
+				}
+			}
+		}
+
+		std::memcpy(m_tData, pTempBuffer, getDataSizeInBytes());
+
+		delete[] pTempBuffer;
+	}
 }