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Replaced number with constant.

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This commit is contained in:
David Williams 2015-04-12 10:35:12 +02:00
parent c4cccf9043
commit 99390580dd
2 changed files with 12 additions and 7 deletions
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13
include/PolyVox/PagedVolume.h
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@ -307,10 +307,15 @@ namespace PolyVox
uint32_t m_uChunkCountLimit = 0;
// The size of the volume
//Region m_regValidRegionInChunks;
mutable std::unique_ptr< Chunk > m_arrayChunks[16384];
// Chunks are stored in the following array which is used as a hash-table. Conventional wisdom is that such a hash-table
// should not be more than half full to avoid conflicts, and a practical chunk size seems to be 64^3. With this configuration
// there can be up to 32768*64^3 = 8 gigavoxels (with each voxel perhaps being many bytes). This should effectively make use
// of even high end machines. Of course, the user can choose to limit the memory usage in which case much less of the chunk
// array will actually be used. None-the-less, we have chosen to use a fixed size array (rather than a vector) as it appear to
// be slightly faster (probably due to the extra pointer indirection in a vector?) and the actual size of this array should
// just be 1Mb or so.
static const uint32_t uChunkArraySize = 65536;
mutable std::unique_ptr< Chunk > m_arrayChunks[uChunkArraySize];
// The size of the chunks
uint16_t m_uChunkSideLength;

6
include/PolyVox/PagedVolume.inl
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@ -58,7 +58,7 @@ namespace PolyVox
// Enforce sensible limits on the number of chunks.
const uint32_t uMinPracticalNoOfChunks = 32; // Enough to make sure a chunks and it's neighbours can be loaded, with a few to spare.
const uint32_t uMaxPracticalNoOfChunks = 32768; // Should prevent multi-gigabyte volumes when chunk sizes are reasonable.
const uint32_t uMaxPracticalNoOfChunks = uChunkArraySize / 2; // A hash table should only become half-full to avoid too many clashes.
POLYVOX_LOG_WARNING_IF(m_uChunkCountLimit < uMinPracticalNoOfChunks, "Requested memory usage limit of "
<< uTargetMemoryUsageInBytes / (1024 * 1024) << "Mb is too low and cannot be adhered to.");
m_uChunkCountLimit = (std::max)(m_uChunkCountLimit, uMinPracticalNoOfChunks);
@ -287,7 +287,7 @@ namespace PolyVox
}
iIndex++;
iIndex %= 16384;
iIndex %= uChunkArraySize;
} while (iIndex != iStartIndex);
// Check whether the chunk was found.
@ -307,7 +307,7 @@ namespace PolyVox
pChunk->m_uChunkLastAccessed = ++m_uTimestamper; // Important, as we may soon delete the oldest chunk
//m_mapChunks.insert(std::make_pair(v3dChunkPos, std::unique_ptr<Chunk>(pChunk)));
for (uint32_t ct = iStartIndex; ct < 16384; ct++)
for (uint32_t ct = iStartIndex; ct < uChunkArraySize; ct++)
{
if (m_arrayChunks[ct] == nullptr)
{