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Added utility function for people who already have data in linear order, to convert it to Morton order.

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This commit is contained in:
David Williams 2015-04-05 10:14:25 +02:00
parent d521b08cf9
commit c887d1444f
2 changed files with 28 additions and 0 deletions
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2
include/PolyVox/PagedVolume.h
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@ -133,6 +133,8 @@ namespace PolyVox
void setVoxel(uint32_t uXPos, uint32_t uYPos, uint32_t uZPos, VoxelType tValue);
void setVoxel(const Vector3DUint16& v3dPos, VoxelType tValue);
void changeLinearOrderingToMorton(void);
private:
/// Private copy constructor to prevent accisdental copying
Chunk(const Chunk& /*rhs*/) {};

26
include/PolyVox/PagedVolumeChunk.inl
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@ -152,4 +152,30 @@ namespace PolyVox
uint32_t uSizeInBytes = uSideLength * uSideLength * uSideLength * sizeof(VoxelType);
return uSizeInBytes;
}
// This convienience function exists for historical reasons. Chunks used to store their data in 'linear' order but now we
// use Morton encoding. Users who still have data in linear order (on disk, in databases, etc) will need to call this function
// if they load the data in by memcpy()ing it via the raw pointer. On the other hand, if they set the data using setVoxel()
// then the ordering is automatically handled correctly.
template <typename VoxelType>
void PagedVolume<VoxelType>::Chunk::changeLinearOrderingToMorton(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[uMortonIndex] = m_tData[uLinearIndex];
}
}
}
std::memcpy(m_tData, pTempBuffer, getDataSizeInBytes());
delete[] pTempBuffer;
}
}