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Added code to initilise empty compressed blocks.

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This commit is contained in:
David Williams 2013-07-24 16:39:31 +02:00
parent 69066a068e
commit b07dafc9fa
2 changed files with 28 additions and 1 deletions
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3
library/PolyVoxCore/include/PolyVoxCore/LargeVolume.h
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@ -359,6 +359,9 @@ namespace PolyVox
Compressor* m_pCompressor;
Pager<VoxelType>* m_pPager;
// Compressed data for an empty block (sometimes needed for initialisation).
CompressedBlock<VoxelType>* m_pCompressedEmptyBlock;
// Whether we created the compressor or whether it was provided
// by the user. This controls whether we delete it on destruction.
bool m_bIsOurCompressor;

26
library/PolyVoxCore/include/PolyVoxCore/LargeVolume.inl
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@ -109,6 +109,8 @@ namespace PolyVox
{
delete m_pCompressor;
}
delete m_pCompressedEmptyBlock;
}
////////////////////////////////////////////////////////////////////////////////
@ -542,6 +544,21 @@ namespace PolyVox
this->m_uLongestSideLength = (std::max)((std::max)(this->getWidth(),this->getHeight()),this->getDepth());
this->m_uShortestSideLength = (std::min)((std::min)(this->getWidth(),this->getHeight()),this->getDepth());
this->m_fDiagonalLength = sqrtf(static_cast<float>(this->getWidth() * this->getWidth() + this->getHeight() * this->getHeight() + this->getDepth() * this->getDepth()));
// This is used for initialising empty blocks.
// FIXME - Should probably build an UncompressedBlock and then call some 'fill()' method. Ideally we should set voxels to an 'empty' (default?) value rather than zeros.
VoxelType* pZeros = new VoxelType[m_uBlockSideLength * m_uBlockSideLength * m_uBlockSideLength];
uint32_t uSrcLength = m_uBlockSideLength * m_uBlockSideLength * m_uBlockSideLength * sizeof(VoxelType);
memset(pZeros, 0, uSrcLength);
uint32_t uDstLength = 100000;
uint8_t* pCompressedZeros = new uint8_t[uDstLength]; //Should be plenty as zeros compress down very small.
uint32_t uCompressedSize = m_pCompressor->compress(reinterpret_cast<void*>(pZeros), uSrcLength, reinterpret_cast<void*>(pCompressedZeros), uDstLength);
m_pCompressedEmptyBlock = new CompressedBlock<VoxelType>;
m_pCompressedEmptyBlock->setData(pCompressedZeros, uCompressedSize);
delete[] pZeros;
delete[] pCompressedZeros;
}
template <typename VoxelType>
@ -664,7 +681,14 @@ namespace PolyVox
Vector3DInt32 v3dLower(v3dBlockPos.getX() << m_uBlockSideLengthPower, v3dBlockPos.getY() << m_uBlockSideLengthPower, v3dBlockPos.getZ() << m_uBlockSideLengthPower);
Vector3DInt32 v3dUpper = v3dLower + Vector3DInt32(m_uBlockSideLength-1, m_uBlockSideLength-1, m_uBlockSideLength-1);
Region reg(v3dLower, v3dUpper);
m_pPager->pageIn(reg, itBlock->second);
m_pPager->pageIn(reg, newBlock);
// The pager may not actually have given us any data (perhaps there wasn't any) so in that case we need to create some ourselves.
if(newBlock->m_bDataModified == false)
{
// Internally this performs a memcpy() of the data.
newBlock->setData(m_pCompressedEmptyBlock->getData(), m_pCompressedEmptyBlock->getDataSizeInBytes());
}
// Paging in this new block may mean we are now using too much memory. If necessary, flush some old blocks.
flushOldestExcessiveBlocks();