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Chunks are now stored with unique_ptr rather than shared_ptr.

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This commit is contained in:
David Williams 2015-03-08 23:30:12 +01:00
parent c98ad8c948
commit 72abcd8e9c
2 changed files with 38 additions and 25 deletions
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10
include/PolyVox/PagedVolume.h
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@ -281,7 +281,7 @@ namespace PolyVox
PagedVolume& operator=(const PagedVolume& rhs);
private:
std::shared_ptr<Chunk> getChunk(int32_t uChunkX, int32_t uChunkY, int32_t uChunkZ) const;
Chunk* getChunk(int32_t uChunkX, int32_t uChunkY, int32_t uChunkZ) const;
void purgeNullPtrsFromAllChunks(void) const;
@ -299,14 +299,16 @@ namespace PolyVox
//
// TODO: Do we really need maps here? It means we are storing the chunk positions in the map, but they are also stored in the
// chunks themselves (so they can be passed to the pager from the chunks destructor). Can we use a set here? What is a better approach?
typedef std::unordered_map<Vector3DInt32, std::weak_ptr< Chunk > > WeakPtrChunkMap;
/*typedef std::unordered_map<Vector3DInt32, std::weak_ptr< Chunk > > WeakPtrChunkMap;
mutable WeakPtrChunkMap m_pAllChunks;
typedef std::unordered_map<Vector3DInt32, std::shared_ptr< Chunk > > SharedPtrChunkMap;
mutable SharedPtrChunkMap m_pRecentlyUsedChunks;
mutable SharedPtrChunkMap m_pRecentlyUsedChunks;*/
mutable std::unordered_map<Vector3DInt32, std::unique_ptr< Chunk > > m_mapChunks;
mutable uint32_t m_uTimestamper = 0;
mutable Vector3DInt32 m_v3dLastAccessedChunkPos = Vector3DInt32(0, 0, 0); //There are no invalid positions, but initially the m_pLastAccessedChunk pointer will be null
mutable std::shared_ptr<Chunk> m_pLastAccessedChunk = nullptr;
mutable Chunk* m_pLastAccessedChunk = nullptr;
uint32_t m_uChunkCountLimit = 0;
// The size of the volume

53
include/PolyVox/PagedVolume.inl
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@ -217,14 +217,19 @@ namespace PolyVox
// Clear this pointer so it doesn't hang on to any chunks.
m_pLastAccessedChunk = nullptr;
/*for (auto chunk : m_mapChunks)
{
delete chunk.second;
}*/
// Erase all the most recently used chunks.
m_pRecentlyUsedChunks.clear();
m_mapChunks.clear();
// Remove deleted chunks from the list of all loaded chunks.
purgeNullPtrsFromAllChunks();
//purgeNullPtrsFromAllChunks();
// If there are still some chunks left then this is a cause for concern. Perhaps samplers are holding on to them?
POLYVOX_LOG_WARNING_IF(m_pAllChunks.size() > 0, "Chunks still exist after performing flushAll()! Perhaps you have samplers attached?");
//POLYVOX_LOG_WARNING_IF(m_pAllChunks.size() > 0, "Chunks still exist after performing flushAll()! Perhaps you have samplers attached?");
}
////////////////////////////////////////////////////////////////////////////////
@ -256,7 +261,7 @@ namespace PolyVox
{
for(int32_t z = v3dStart.getZ(); z <= v3dEnd.getZ(); z++)
{
m_pRecentlyUsedChunks.erase(Vector3DInt32(x, y, z));
m_mapChunks.erase(Vector3DInt32(x, y, z));
}
}
}
@ -268,7 +273,7 @@ namespace PolyVox
}
template <typename VoxelType>
std::shared_ptr<typename PagedVolume<VoxelType>::Chunk> PagedVolume<VoxelType>::getChunk(int32_t uChunkX, int32_t uChunkY, int32_t uChunkZ) const
typename PagedVolume<VoxelType>::Chunk* PagedVolume<VoxelType>::getChunk(int32_t uChunkX, int32_t uChunkY, int32_t uChunkZ) const
{
Vector3DInt32 v3dChunkPos(uChunkX, uChunkY, uChunkZ);
@ -282,18 +287,21 @@ namespace PolyVox
}
// The chunk was not the same as last time, but we can now hope it is in the set of most recently used chunks.
std::shared_ptr<typename PagedVolume<VoxelType>::Chunk> pChunk = nullptr;
typename SharedPtrChunkMap::iterator itChunk = m_pRecentlyUsedChunks.find(v3dChunkPos);
//std::shared_ptr<typename PagedVolume<VoxelType>::Chunk> pChunk = nullptr;
//typename SharedPtrChunkMap::iterator itChunk = m_pRecentlyUsedChunks.find(v3dChunkPos);
Chunk* pChunk = nullptr;
auto itChunk = m_mapChunks.find(v3dChunkPos);
// Check whether the chunk was found.
if ((itChunk) != m_pRecentlyUsedChunks.end())
if ((itChunk) != m_mapChunks.end())
{
// The chunk was found so we can use it.
pChunk = itChunk->second;
pChunk = itChunk->second.get();
POLYVOX_ASSERT(pChunk, "Recent chunk list shold never contain a null pointer.");
}
if (!pChunk)
/*if (!pChunk)
{
// Although it's not in our recently use chunks, there's some (slim) chance that it
// exists in the list of all loaded chunks, because a sampler may be holding on to it.
@ -314,21 +322,22 @@ namespace PolyVox
m_pRecentlyUsedChunks.insert(std::make_pair(v3dChunkPos, pChunk));
}
}
}
}*/
// If we still haven't found the chunk then it's time to create a new one and page it in from disk.
if (!pChunk)
{
// The chunk was not found so we will create a new one.
pChunk = std::make_shared< PagedVolume<VoxelType>::Chunk >(v3dChunkPos, m_uChunkSideLength, m_pPager);
//pChunk = std::make_shared< PagedVolume<VoxelType>::Chunk >(v3dChunkPos, m_uChunkSideLength, m_pPager);
pChunk = new PagedVolume<VoxelType>::Chunk(v3dChunkPos, m_uChunkSideLength, m_pPager);
// As we are loading a new chunk we should try to ensure we don't go over our target memory usage.
bool erasedChunk = false;
while (m_pRecentlyUsedChunks.size() + 1 > m_uChunkCountLimit) // +1 ready for new chunk we will add next.
while (m_mapChunks.size() + 1 > m_uChunkCountLimit) // +1 ready for new chunk we will add next.
{
// Find the least recently used chunk. Hopefully this isn't too slow.
typename SharedPtrChunkMap::iterator itUnloadChunk = m_pRecentlyUsedChunks.begin();
for (typename SharedPtrChunkMap::iterator i = m_pRecentlyUsedChunks.begin(); i != m_pRecentlyUsedChunks.end(); i++)
auto itUnloadChunk = m_mapChunks.begin();
for (auto i = m_mapChunks.begin(); i != m_mapChunks.end(); i++)
{
if (i->second->m_uChunkLastAccessed < itUnloadChunk->second->m_uChunkLastAccessed)
{
@ -337,7 +346,8 @@ namespace PolyVox
}
// Erase the least recently used chunk
m_pRecentlyUsedChunks.erase(itUnloadChunk);
//delete itUnloadChunk->second;
m_mapChunks.erase(itUnloadChunk);
erasedChunk = true;
}
@ -349,8 +359,9 @@ namespace PolyVox
}
// Add our new chunk to the maps.
m_pAllChunks.insert(std::make_pair(v3dChunkPos, pChunk));
m_pRecentlyUsedChunks.insert(std::make_pair(v3dChunkPos, pChunk));
//m_pAllChunks.insert(std::make_pair(v3dChunkPos, pChunk));
//m_pRecentlyUsedChunks.insert(std::make_pair(v3dChunkPos, pChunk));
m_mapChunks.insert(std::make_pair(v3dChunkPos, std::unique_ptr<Chunk>(pChunk)));
}
pChunk->m_uChunkLastAccessed = ++m_uTimestamper;
@ -371,13 +382,13 @@ namespace PolyVox
// Note: We disregard the size of the other class members as they are likely to be very small compared to the size of the
// allocated voxel data. This also keeps the reported size as a power of two, which makes other memory calculations easier.
return PagedVolume<VoxelType>::Chunk::calculateSizeInBytes(m_uChunkSideLength) * m_pAllChunks.size();
return PagedVolume<VoxelType>::Chunk::calculateSizeInBytes(m_uChunkSideLength) * m_mapChunks.size();
}
template <typename VoxelType>
void PagedVolume<VoxelType>::purgeNullPtrsFromAllChunks(void) const
{
for (auto chunkIter = m_pAllChunks.begin(); chunkIter != m_pAllChunks.end();)
/*for (auto chunkIter = m_pAllChunks.begin(); chunkIter != m_pAllChunks.end();)
{
if (chunkIter->second.expired())
{
@ -387,7 +398,7 @@ namespace PolyVox
{
chunkIter++;
}
}
}*/
}
}