VertexDataPage¶
from panda3d.core import VertexDataPage
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class
VertexDataPage
¶ Bases:
SimpleAllocator
,SimpleLruPage
A block of bytes that holds one or more
VertexDataBlocks
. The entire page may be paged out, in the form of in-memory compression or to an on-disk cache file, if necessary.Inheritance diagram
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enum
RamClass
¶ These are used to indicate the current residency state of the page, which may or may not have been temporarily evicted to satisfy memory requirements.
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enumerator
RC_resident
= 0¶
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enumerator
RC_compressed
= 1¶
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enumerator
RC_disk
= 2¶
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enumerator
RC_end_of_list
= 3¶ list marker; do not use
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enumerator
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alloc
(size: int) → VertexDataBlock¶ Allocates a new block. Returns NULL if a block of the requested size cannot be allocated.
To free the allocated block, call block->free(), or simply delete the block pointer.
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static
flushThreads
()¶ Waits for all of the pending thread tasks to finish before returning.
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getBook
() → VertexDataBook¶ Returns a pointer to the book that owns this page.
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static
getClassType
() → TypeHandle¶
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getFirstBlock
() → VertexDataBlock¶ Returns a pointer to the first allocated block, or NULL if there are no allocated blocks.
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static
getGlobalLru
(rclass: RamClass) → SimpleLru¶ Returns a pointer to the global LRU object that manages the VertexDataPage’s with the indicated
RamClass
.
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static
getNumPendingReads
() → int¶ Returns the number of read requests that are waiting to be serviced by a thread.
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static
getNumPendingWrites
() → int¶ Returns the number of write requests that are waiting to be serviced by a thread.
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static
getNumThreads
() → int¶ Returns the number of threads that have been spawned to service vertex paging requests, or 0 if no threads have been spawned (which may mean either that all paging requests will be handled by the main thread, or simply that no paging requests have yet been issued).
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static
getPendingLru
() → SimpleLru¶ Returns a pointer to the global LRU object that manages the VertexDataPage’s that are pending processing by the thread.
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getPendingRamClass
() → RamClass¶ Returns the pending ram class of the array. If this is different from
getRamClass()
, this page has been queued to be processed by the thread. Eventually the page will be set to this ram class.
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getRamClass
() → RamClass¶ Returns the current ram class of the array. If this is other than RC_resident, the array data is not resident in memory.
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static
getSaveFile
() → VertexDataSaveFile¶ Returns the global
VertexDataSaveFile
that will be used to save vertex data buffers to disk when necessary.
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requestResident
()¶ Ensures that the page will become resident soon. Future calls to get_page_data() will eventually return non-NULL.
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saveToDisk
() → bool¶ Writes the page to disk, but does not evict it from memory or affect its LRU status. If it gets evicted later without having been modified, it will not need to write itself to disk again.
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property
save_file
→ VertexDataSaveFile¶ Returns the global
VertexDataSaveFile
that will be used to save vertex data buffers to disk when necessary.
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static
stopThreads
()¶ Call this to stop the paging threads, if they were started. This may block until all of the pending tasks have been completed.
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enum