2051 lines
85 KiB
Plaintext
2051 lines
85 KiB
Plaintext
// Copyright (c) 2015-2017 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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[[memory]]
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= Memory Allocation
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Vulkan memory is broken up into two categories, _host memory_ and _device
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memory_.
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[[memory-host]]
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== Host Memory
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Host memory is memory needed by the Vulkan implementation for
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non-device-visible storage.
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This storage may: be used for e.g. internal software structures.
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[[memory-allocation]]
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Vulkan provides applications the opportunity to perform host memory
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allocations on behalf of the Vulkan implementation.
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If this feature is not used, the implementation will perform its own memory
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allocations.
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Since most memory allocations are off the critical path, this is not meant
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as a performance feature.
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Rather, this can: be useful for certain embedded systems, for debugging
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purposes (e.g. putting a guard page after all host allocations), or for
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memory allocation logging.
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[open,refpage='VkAllocationCallbacks',desc='Structure containing callback function pointers for memory allocation',type='structs']
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--
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Allocators are provided by the application as a pointer to a
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sname:VkAllocationCallbacks structure:
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include::../api/structs/VkAllocationCallbacks.txt[]
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* pname:pUserData is a value to be interpreted by the implementation of
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the callbacks.
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When any of the callbacks in sname:VkAllocationCallbacks are called, the
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Vulkan implementation will pass this value as the first parameter to the
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callback.
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This value can: vary each time an allocator is passed into a command,
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even when the same object takes an allocator in multiple commands.
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* pname:pfnAllocation is a pointer to an application-defined memory
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allocation function of type tlink:PFN_vkAllocationFunction.
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* pname:pfnReallocation is a pointer to an application-defined memory
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reallocation function of type tlink:PFN_vkReallocationFunction.
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* pname:pfnFree is a pointer to an application-defined memory free
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function of type tlink:PFN_vkFreeFunction.
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* pname:pfnInternalAllocation is a pointer to an application-defined
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function that is called by the implementation when the implementation
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makes internal allocations, and it is of type
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tlink:PFN_vkInternalAllocationNotification.
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* pname:pfnInternalFree is a pointer to an application-defined function
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that is called by the implementation when the implementation frees
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internal allocations, and it is of type
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tlink:PFN_vkInternalFreeNotification.
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.Valid Usage
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****
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* [[VUID-VkAllocationCallbacks-pfnAllocation-00632]]
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pname:pfnAllocation must: be a pointer to a valid user-defined
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tlink:PFN_vkAllocationFunction
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* [[VUID-VkAllocationCallbacks-pfnReallocation-00633]]
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pname:pfnReallocation must: be a pointer to a valid user-defined
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tlink:PFN_vkReallocationFunction
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* [[VUID-VkAllocationCallbacks-pfnFree-00634]]
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pname:pfnFree must: be a pointer to a valid user-defined
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tlink:PFN_vkFreeFunction
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* [[VUID-VkAllocationCallbacks-pfnInternalAllocation-00635]]
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If either of pname:pfnInternalAllocation or pname:pfnInternalFree is not
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`NULL`, both must: be valid callbacks
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****
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include::../validity/structs/VkAllocationCallbacks.txt[]
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--
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[open,refpage='PFN_vkAllocationFunction',desc='Application-defined memory allocation function',type='funcpointers',xrefs='VkAllocationCallbacks']
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--
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The type of pname:pfnAllocation is:
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include::../api/funcpointers/PFN_vkAllocationFunction.txt[]
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* pname:pUserData is the value specified for
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slink:VkAllocationCallbacks::pname:pUserData in the allocator specified
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by the application.
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* pname:size is the size in bytes of the requested allocation.
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* pname:alignment is the requested alignment of the allocation in bytes
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and must: be a power of two.
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* pname:allocationScope is a elink:VkSystemAllocationScope value
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specifying the allocation scope of the lifetime of the allocation, as
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described <<memory-host-allocation-scope,here>>.
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[[vkAllocationFunction_return_rules]]
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If pname:pfnAllocation is unable to allocate the requested memory, it must:
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return `NULL`.
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If the allocation was successful, it must: return a valid pointer to memory
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allocation containing at least pname:size bytes, and with the pointer value
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being a multiple of pname:alignment.
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[NOTE]
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.Note
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====
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Correct Vulkan operation cannot: be assumed if the application does not
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follow these rules.
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For example, pname:pfnAllocation (or pname:pfnReallocation) could cause
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termination of running Vulkan instance(s) on a failed allocation for
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debugging purposes, either directly or indirectly.
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In these circumstances, it cannot: be assumed that any part of any affected
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VkInstance objects are going to operate correctly (even
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flink:vkDestroyInstance), and the application must: ensure it cleans up
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properly via other means (e.g. process termination).
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====
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If pname:pfnAllocation returns `NULL`, and if the implementation is unable
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to continue correct processing of the current command without the requested
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allocation, it must: treat this as a run-time error, and generate
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ename:VK_ERROR_OUT_OF_HOST_MEMORY at the appropriate time for the command in
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which the condition was detected, as described in <<fundamentals-errorcodes,
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Return Codes>>.
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If the implementation is able to continue correct processing of the current
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command without the requested allocation, then it may: do so, and must: not
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generate ename:VK_ERROR_OUT_OF_HOST_MEMORY as a result of this failed
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allocation.
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--
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[open,refpage='PFN_vkReallocationFunction',desc='Application-defined memory reallocation function',type='funcpointers',xrefs='VkAllocationCallbacks']
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--
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The type of pname:pfnReallocation is:
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include::../api/funcpointers/PFN_vkReallocationFunction.txt[]
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* pname:pUserData is the value specified for
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slink:VkAllocationCallbacks::pname:pUserData in the allocator specified
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by the application.
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* pname:pOriginal must: be either `NULL` or a pointer previously returned
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by pname:pfnReallocation or pname:pfnAllocation of the same allocator.
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* pname:size is the size in bytes of the requested allocation.
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* pname:alignment is the requested alignment of the allocation in bytes
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and must: be a power of two.
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* pname:allocationScope is a elink:VkSystemAllocationScope value
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specifying the allocation scope of the lifetime of the allocation, as
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described <<memory-host-allocation-scope,here>>.
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pname:pfnReallocation must: return an allocation with enough space for
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pname:size bytes, and the contents of the original allocation from bytes
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zero to [eq]#min(original size, new size) - 1# must: be preserved in the
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returned allocation.
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If pname:size is larger than the old size, the contents of the additional
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space are undefined.
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If satisfying these requirements involves creating a new allocation, then
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the old allocation should: be freed.
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If pname:pOriginal is `NULL`, then pname:pfnReallocation must: behave
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equivalently to a call to tlink:PFN_vkAllocationFunction with the same
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parameter values (without pname:pOriginal).
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If pname:size is zero, then pname:pfnReallocation must: behave equivalently
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to a call to tlink:PFN_vkFreeFunction with the same pname:pUserData
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parameter value, and pname:pMemory equal to pname:pOriginal.
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If pname:pOriginal is non-`NULL`, the implementation must: ensure that
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pname:alignment is equal to the pname:alignment used to originally allocate
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pname:pOriginal.
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If this function fails and pname:pOriginal is non-`NULL` the application
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must: not free the old allocation.
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pname:pfnReallocation must: follow the same
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<<vkAllocationFunction_return_rules, rules for return values as
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tname:PFN_vkAllocationFunction>>.
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--
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[open,refpage='PFN_vkFreeFunction',desc='Application-defined memory free function',type='funcpointers',xrefs='VkAllocationCallbacks']
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--
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The type of pname:pfnFree is:
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include::../api/funcpointers/PFN_vkFreeFunction.txt[]
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* pname:pUserData is the value specified for
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slink:VkAllocationCallbacks::pname:pUserData in the allocator specified
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by the application.
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* pname:pMemory is the allocation to be freed.
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pname:pMemory may: be `NULL`, which the callback must: handle safely.
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If pname:pMemory is non-`NULL`, it must: be a pointer previously allocated
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by pname:pfnAllocation or pname:pfnReallocation.
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The application should: free this memory.
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--
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[open,refpage='PFN_vkInternalAllocationNotification',desc='Application-defined memory allocation notification function',type='funcpointers',xrefs='VkAllocationCallbacks']
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--
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The type of pname:pfnInternalAllocation is:
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include::../api/funcpointers/PFN_vkInternalAllocationNotification.txt[]
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* pname:pUserData is the value specified for
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slink:VkAllocationCallbacks::pname:pUserData in the allocator specified
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by the application.
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* pname:size is the requested size of an allocation.
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* pname:allocationType is a elink:VkInternalAllocationType value
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specifying the requested type of an allocation.
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* pname:allocationScope is a elink:VkSystemAllocationScope value
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specifying the allocation scope of the lifetime of the allocation, as
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described <<memory-host-allocation-scope,here>>.
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This is a purely informational callback.
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--
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[open,refpage='PFN_vkInternalFreeNotification',desc='Application-defined memory free notification function',type='funcpointers',xrefs='VkAllocationCallbacks']
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--
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The type of pname:pfnInternalFree is:
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include::../api/funcpointers/PFN_vkInternalFreeNotification.txt[]
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* pname:pUserData is the value specified for
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slink:VkAllocationCallbacks::pname:pUserData in the allocator specified
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by the application.
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* pname:size is the requested size of an allocation.
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* pname:allocationType is a elink:VkInternalAllocationType value
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specifying the requested type of an allocation.
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* pname:allocationScope is a elink:VkSystemAllocationScope value
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specifying the allocation scope of the lifetime of the allocation, as
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described <<memory-host-allocation-scope,here>>.
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--
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[open,refpage='VkSystemAllocationScope',desc='Allocation scope',type='enums',xrefs='VkAllocationCallbacks']
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--
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[[memory-host-allocation-scope]]
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Each allocation has an _allocation scope_ which defines its lifetime and
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which object it is associated with.
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Possible values passed to the pname:allocationScope parameter of the
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callback functions specified by slink:VkAllocationCallbacks, indicating the
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allocation scope, are:
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include::../api/enums/VkSystemAllocationScope.txt[]
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* ename:VK_SYSTEM_ALLOCATION_SCOPE_COMMAND specifies that the allocation
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is scoped to the duration of the Vulkan command.
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* ename:VK_SYSTEM_ALLOCATION_SCOPE_OBJECT specifies that the allocation is
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scoped to the lifetime of the Vulkan object that is being created or
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used.
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* ename:VK_SYSTEM_ALLOCATION_SCOPE_CACHE specifies that the allocation is
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scoped to the lifetime of a sname:VkPipelineCache
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ifdef::VK_EXT_validation_cache[]
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or sname:VkValidationCacheEXT
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endif::VK_EXT_validation_cache[]
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object.
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* ename:VK_SYSTEM_ALLOCATION_SCOPE_DEVICE specifies that the allocation is
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scoped to the lifetime of the Vulkan device.
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* ename:VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE specifies that the allocation
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is scoped to the lifetime of the Vulkan instance.
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Most Vulkan commands operate on a single object, or there is a sole object
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that is being created or manipulated.
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When an allocation uses an allocation scope of
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ename:VK_SYSTEM_ALLOCATION_SCOPE_OBJECT or
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ename:VK_SYSTEM_ALLOCATION_SCOPE_CACHE, the allocation is scoped to the
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object being created or manipulated.
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When an implementation requires host memory, it will make callbacks to the
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application using the most specific allocator and allocation scope
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available:
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* If an allocation is scoped to the duration of a command, the allocator
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will use the ename:VK_SYSTEM_ALLOCATION_SCOPE_COMMAND allocation scope.
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The most specific allocator available is used: if the object being
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created or manipulated has an allocator, that object's allocator will be
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used, else if the parent sname:VkDevice has an allocator it will be
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used, else if the parent sname:VkInstance has an allocator it will be
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used.
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Else,
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* If an allocation is associated with an object of type
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ifdef::VK_EXT_validation_cache[]
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sname:VkValidationCacheEXT or
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endif::VK_EXT_validation_cache[]
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sname:VkPipelineCache, the allocator will use the
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ename:VK_SYSTEM_ALLOCATION_SCOPE_CACHE allocation scope.
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The most specific allocator available is used (cache, else device, else
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instance).
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Else,
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* If an allocation is scoped to the lifetime of an object, that object is
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being created or manipulated by the command, and that object's type is
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not sname:VkDevice or sname:VkInstance, the allocator will use an
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allocation scope of ename:VK_SYSTEM_ALLOCATION_SCOPE_OBJECT.
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The most specific allocator available is used (object, else device, else
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instance).
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Else,
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* If an allocation is scoped to the lifetime of a device, the allocator
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will use an allocation scope of ename:VK_SYSTEM_ALLOCATION_SCOPE_DEVICE.
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The most specific allocator available is used (device, else instance).
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Else,
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* If the allocation is scoped to the lifetime of an instance and the
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instance has an allocator, its allocator will be used with an allocation
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scope of ename:VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE.
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* Otherwise an implementation will allocate memory through an alternative
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mechanism that is unspecified.
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--
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Objects that are allocated from pools do not specify their own allocator.
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When an implementation requires host memory for such an object, that memory
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is sourced from the object's parent pool's allocator.
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The application is not expected to handle allocating memory that is intended
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for execution by the host due to the complexities of differing security
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implementations across multiple platforms.
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The implementation will allocate such memory internally and invoke an
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application provided informational callback when these _internal
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allocations_ are allocated and freed.
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Upon allocation of executable memory, pname:pfnInternalAllocation will be
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called.
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Upon freeing executable memory, pname:pfnInternalFree will be called.
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An implementation will only call an informational callback for executable
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memory allocations and frees.
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[open,refpage='VkInternalAllocationType',desc='Allocation type',type='enums',xrefs='PFN_vkInternalAllocationNotification PFN_vkInternalFreeNotification']
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--
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The pname:allocationType parameter to the pname:pfnInternalAllocation and
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pname:pfnInternalFree functions may: be one of the following values:
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include::../api/enums/VkInternalAllocationType.txt[]
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* ename:VK_INTERNAL_ALLOCATION_TYPE_EXECUTABLE specifies that the
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allocation is intended for execution by the host.
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--
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An implementation must: only make calls into an application-provided
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allocator during the execution of an API command.
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An implementation must: only make calls into an application-provided
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allocator from the same thread that called the provoking API command.
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The implementation should: not synchronize calls to any of the callbacks.
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If synchronization is needed, the callbacks must: provide it themselves.
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The informational callbacks are subject to the same restrictions as the
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allocation callbacks.
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If an implementation intends to make calls through an
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sname:VkAllocationCallbacks structure between the time a ftext:vkCreate*
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command returns and the time a corresponding ftext:vkDestroy* command
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begins, that implementation must: save a copy of the allocator before the
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ftext:vkCreate* command returns.
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The callback functions and any data structures they rely upon must: remain
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valid for the lifetime of the object they are associated with.
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If an allocator is provided to a ftext:vkCreate* command, a _compatible_
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allocator must: be provided to the corresponding ftext:vkDestroy* command.
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Two sname:VkAllocationCallbacks structures are compatible if memory
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allocated with pname:pfnAllocation or pname:pfnReallocation in each can: be
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freed with pname:pfnReallocation or pname:pfnFree in the other.
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An allocator must: not be provided to a ftext:vkDestroy* command if an
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allocator was not provided to the corresponding ftext:vkCreate* command.
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If a non-`NULL` allocator is used, the pname:pfnAllocation,
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pname:pfnReallocation and pname:pfnFree members must: be non-`NULL` and
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point to valid implementations of the callbacks.
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An application can: choose to not provide informational callbacks by setting
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both pname:pfnInternalAllocation and pname:pfnInternalFree to `NULL`.
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pname:pfnInternalAllocation and pname:pfnInternalFree must: either both be
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`NULL` or both be non-`NULL`.
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If pname:pfnAllocation or pname:pfnReallocation fail, the implementation
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may: fail object creation and/or generate an
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ename:VK_ERROR_OUT_OF_HOST_MEMORY error, as appropriate.
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Allocation callbacks must: not call any Vulkan commands.
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The following sets of rules define when an implementation is permitted to
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call the allocator callbacks.
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pname:pfnAllocation or pname:pfnReallocation may: be called in the following
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situations:
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* Allocations scoped to a sname:VkDevice or sname:VkInstance may: be
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allocated from any API command.
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* Allocations scoped to a command may: be allocated from any API command.
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* Allocations scoped to a sname:VkPipelineCache may: only be allocated
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from:
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** fname:vkCreatePipelineCache
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** fname:vkMergePipelineCaches for pname:dstCache
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** fname:vkCreateGraphicsPipelines for pname:pipelineCache
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** fname:vkCreateComputePipelines for pname:pipelineCache
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ifdef::VK_EXT_validation_cache[]
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* Allocations scoped to a sname:VkValidationCacheEXT may: only be
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allocated from:
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** fname:vkCreateValidationCacheEXT
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** fname:vkMergeValidationCachesEXT for pname:dstCache
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** fname:vkCreateShaderModule for pname:validationCache in
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sname:VkShaderModuleValidationCacheCreateInfoEXT
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endif::VK_EXT_validation_cache[]
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* Allocations scoped to a sname:VkDescriptorPool may: only be allocated
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from:
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** any command that takes the pool as a direct argument
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** fname:vkAllocateDescriptorSets for the pname:descriptorPool member of
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its pname:pAllocateInfo parameter
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** fname:vkCreateDescriptorPool
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* Allocations scoped to a sname:VkCommandPool may: only be allocated from:
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** any command that takes the pool as a direct argument
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** fname:vkCreateCommandPool
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** fname:vkAllocateCommandBuffers for the pname:commandPool member of its
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pname:pAllocateInfo parameter
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** any ftext:vkCmd* command whose pname:commandBuffer was allocated from
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that sname:VkCommandPool
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* Allocations scoped to any other object may: only be allocated in that
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object's ftext:vkCreate* command.
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pname:pfnFree may: be called in the following situations:
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* Allocations scoped to a sname:VkDevice or sname:VkInstance may: be freed
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from any API command.
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* Allocations scoped to a command must: be freed by any API command which
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allocates such memory.
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* Allocations scoped to a sname:VkPipelineCache may: be freed from
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fname:vkDestroyPipelineCache.
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ifdef::VK_EXT_validation_cache[]
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* Allocations scoped to a sname:VkValidationCacheEXT may: be freed from
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fname:vkDestroyValidationCacheEXT.
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endif::VK_EXT_validation_cache[]
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* Allocations scoped to a sname:VkDescriptorPool may: be freed from
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** any command that takes the pool as a direct argument
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* Allocations scoped to a sname:VkCommandPool may: be freed from:
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** any command that takes the pool as a direct argument
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** fname:vkResetCommandBuffer whose pname:commandBuffer was allocated from
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that sname:VkCommandPool
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* Allocations scoped to any other object may: be freed in that object's
|
|
ftext:vkDestroy* command.
|
|
* Any command that allocates host memory may: also free host memory of the
|
|
same scope.
|
|
|
|
|
|
[[memory-device]]
|
|
== Device Memory
|
|
|
|
Device memory is memory that is visible to the device, for example the
|
|
contents of opaque images that can: be natively used by the device, or
|
|
uniform buffer objects that reside in on-device memory.
|
|
|
|
Memory properties of a physical device describe the memory heaps and memory
|
|
types available.
|
|
|
|
[open,refpage='vkGetPhysicalDeviceMemoryProperties',desc='Reports memory information for the specified physical device',type='protos']
|
|
--
|
|
|
|
To query memory properties, call:
|
|
|
|
include::../api/protos/vkGetPhysicalDeviceMemoryProperties.txt[]
|
|
|
|
* pname:physicalDevice is the handle to the device to query.
|
|
* pname:pMemoryProperties points to an instance of
|
|
sname:VkPhysicalDeviceMemoryProperties structure in which the properties
|
|
are returned.
|
|
|
|
include::../validity/protos/vkGetPhysicalDeviceMemoryProperties.txt[]
|
|
--
|
|
|
|
[open,refpage='VkPhysicalDeviceMemoryProperties',desc='Structure specifying physical device memory properties',type='structs']
|
|
--
|
|
|
|
The sname:VkPhysicalDeviceMemoryProperties structure is defined as:
|
|
|
|
include::../api/structs/VkPhysicalDeviceMemoryProperties.txt[]
|
|
|
|
* pname:memoryTypeCount is the number of valid elements in the
|
|
pname:memoryTypes array.
|
|
* pname:memoryTypes is an array of slink:VkMemoryType structures
|
|
describing the _memory types_ that can: be used to access memory
|
|
allocated from the heaps specified by pname:memoryHeaps.
|
|
* pname:memoryHeapCount is the number of valid elements in the
|
|
pname:memoryHeaps array.
|
|
* pname:memoryHeaps is an array of slink:VkMemoryHeap structures
|
|
describing the _memory heaps_ from which memory can: be allocated.
|
|
|
|
The sname:VkPhysicalDeviceMemoryProperties structure describes a number of
|
|
_memory heaps_ as well as a number of _memory types_ that can: be used to
|
|
access memory allocated in those heaps.
|
|
Each heap describes a memory resource of a particular size, and each memory
|
|
type describes a set of memory properties (e.g. host cached vs uncached)
|
|
that can: be used with a given memory heap.
|
|
Allocations using a particular memory type will consume resources from the
|
|
heap indicated by that memory type's heap index.
|
|
More than one memory type may: share each heap, and the heaps and memory
|
|
types provide a mechanism to advertise an accurate size of the physical
|
|
memory resources while allowing the memory to be used with a variety of
|
|
different properties.
|
|
|
|
The number of memory heaps is given by pname:memoryHeapCount and is less
|
|
than or equal to ename:VK_MAX_MEMORY_HEAPS.
|
|
Each heap is described by an element of the pname:memoryHeaps array, as a
|
|
sname:VkMemoryHeap structure.
|
|
The number of memory types available across all memory heaps is given by
|
|
pname:memoryTypeCount and is less than or equal to
|
|
ename:VK_MAX_MEMORY_TYPES.
|
|
Each memory type is described by an element of the pname:memoryTypes array,
|
|
as a sname:VkMemoryType structure.
|
|
|
|
At least one heap must: include ename:VK_MEMORY_HEAP_DEVICE_LOCAL_BIT in
|
|
slink:VkMemoryHeap::pname:flags.
|
|
If there are multiple heaps that all have similar performance
|
|
characteristics, they may: all include
|
|
ename:VK_MEMORY_HEAP_DEVICE_LOCAL_BIT.
|
|
In a unified memory architecture (UMA) system, there is often only a single
|
|
memory heap which is considered to be equally "`local`" to the host and to
|
|
the device, and such an implementation must: advertise the heap as
|
|
device-local.
|
|
|
|
|
|
Each memory type returned by flink:vkGetPhysicalDeviceMemoryProperties must:
|
|
have its pname:propertyFlags set to one of the following values:
|
|
|
|
* 0
|
|
* ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
|
|
* ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_CACHED_BIT
|
|
* ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_CACHED_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
|
|
* ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT
|
|
* ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
|
|
* ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_CACHED_BIT
|
|
* ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_CACHED_BIT |
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT
|
|
* ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT |
|
|
ename:VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT
|
|
|
|
There must: be at least one memory type with both the
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT and
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT bits set in its
|
|
pname:propertyFlags.
|
|
There must: be at least one memory type with the
|
|
ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT bit set in its
|
|
pname:propertyFlags.
|
|
|
|
The memory types are sorted according to a preorder which serves to aid in
|
|
easily selecting an appropriate memory type.
|
|
Given two memory types X and Y, the preorder defines [eq]#X {leq} Y# if:
|
|
|
|
* the memory property bits set for X are a strict subset of the memory
|
|
property bits set for Y. Or,
|
|
* the memory property bits set for X are the same as the memory property
|
|
bits set for Y, and X uses a memory heap with greater or equal
|
|
performance (as determined in an implementation-specific manner).
|
|
|
|
Memory types are ordered in the list such that X is assigned a lesser
|
|
pname:memoryTypeIndex than Y if [eq]#(X {leq} Y) {land} {lnot} (Y {leq} X)#
|
|
according to the preorder.
|
|
Note that the list of all allowed memory property flag combinations above
|
|
satisfies this preorder, but other orders would as well.
|
|
The goal of this ordering is to enable applications to use a simple search
|
|
loop in selecting the proper memory type, along the lines of:
|
|
|
|
[source,c++]
|
|
---------------------------------------------------
|
|
// Find a memory type in "memoryTypeBits" that includes all of "properties"
|
|
int32_t FindProperties(uint32_t memoryTypeBits, VkMemoryPropertyFlags properties)
|
|
{
|
|
for (int32_t i = 0; i < memoryTypeCount; ++i)
|
|
{
|
|
if ((memoryTypeBits & (1 << i)) &&
|
|
((memoryTypes[i].propertyFlags & properties) == properties))
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
// Try to find an optimal memory type, or if it does not exist
|
|
// find any compatible memory type
|
|
VkMemoryRequirements memoryRequirements;
|
|
vkGetImageMemoryRequirements(device, image, &memoryRequirements);
|
|
int32_t memoryType = FindProperties(memoryRequirements.memoryTypeBits, optimalProperties);
|
|
if (memoryType == -1)
|
|
memoryType = FindProperties(memoryRequirements.memoryTypeBits, requiredProperties);
|
|
---------------------------------------------------
|
|
|
|
The loop will find the first supported memory type that has all bits
|
|
requested in code:properties set.
|
|
If there is no exact match, it will find a closest match (i.e. a memory type
|
|
with the fewest additional bits set), which has some additional bits set but
|
|
which are not detrimental to the behaviors requested by code:properties.
|
|
The application can: first search for the optimal properties, e.g. a memory
|
|
type that is device-local or supports coherent cached accesses, as
|
|
appropriate for the intended usage, and if such a memory type is not present
|
|
can: fallback to searching for a less optimal but guaranteed set of
|
|
properties such as "0" or "host-visible and coherent".
|
|
|
|
include::../validity/structs/VkPhysicalDeviceMemoryProperties.txt[]
|
|
--
|
|
|
|
ifdef::VK_KHR_get_physical_device_properties2[]
|
|
|
|
[open,refpage='vkGetPhysicalDeviceMemoryProperties2KHR',desc='Reports memory information for the specified physical device',type='protos']
|
|
--
|
|
|
|
To query memory properties, call:
|
|
|
|
include::../api/protos/vkGetPhysicalDeviceMemoryProperties2KHR.txt[]
|
|
|
|
* pname:physicalDevice is the handle to the device to query.
|
|
* pname:pMemoryProperties points to an instance of
|
|
sname:VkPhysicalDeviceMemoryProperties2KHR structure in which the
|
|
properties are returned.
|
|
|
|
fname:vkGetPhysicalDeviceMemoryProperties2KHR behaves similarly to
|
|
flink:vkGetPhysicalDeviceMemoryProperties, with the ability to return
|
|
extended information in a pname:pNext chain of output structures.
|
|
|
|
include::../validity/protos/vkGetPhysicalDeviceMemoryProperties2KHR.txt[]
|
|
--
|
|
|
|
[open,refpage='VkPhysicalDeviceMemoryProperties2KHR',desc='Structure specifying physical device memory properties',type='structs']
|
|
--
|
|
|
|
The sname:VkPhysicalDeviceMemoryProperties2KHR structure is defined as:
|
|
|
|
include::../api/structs/VkPhysicalDeviceMemoryProperties2KHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:memoryProperties is a structure of type
|
|
slink:VkPhysicalDeviceMemoryProperties which is populated with the same
|
|
values as in flink:vkGetPhysicalDeviceMemoryProperties.
|
|
|
|
include::../validity/structs/VkPhysicalDeviceMemoryProperties2KHR.txt[]
|
|
--
|
|
|
|
endif::VK_KHR_get_physical_device_properties2[]
|
|
|
|
[open,refpage='VkMemoryHeap',desc='Structure specifying a memory heap',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryHeap structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryHeap.txt[]
|
|
|
|
* pname:size is the total memory size in bytes in the heap.
|
|
* pname:flags is a bitmask of elink:VkMemoryHeapFlagBits specifying
|
|
attribute flags for the heap.
|
|
|
|
include::../validity/structs/VkMemoryHeap.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMemoryHeapFlagBits',desc='Bitmask specifying attribute flags for a heap',type='enums']
|
|
--
|
|
|
|
Bits which may: be set in slink:VkMemoryHeap::pname:flags, indicating
|
|
attribute flags for the heap, are:
|
|
|
|
include::../api/enums/VkMemoryHeapFlagBits.txt[]
|
|
|
|
* ename:VK_MEMORY_HEAP_DEVICE_LOCAL_BIT indicates that the heap
|
|
corresponds to device local memory.
|
|
Device local memory may: have different performance characteristics than
|
|
host local memory, and may: support different memory property flags.
|
|
ifdef::VK_KHX_device_group_creation[]
|
|
* ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHX indicates that in a logical
|
|
device representing more than one physical device, there is a
|
|
per-physical device instance of the heap memory.
|
|
By default, an allocation from such a heap will be replicated to each
|
|
physical device's instance of the heap.
|
|
endif::VK_KHX_device_group_creation[]
|
|
|
|
--
|
|
|
|
[open,refpage='VkMemoryType',desc='Structure specifying memory type',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryType structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryType.txt[]
|
|
|
|
* pname:heapIndex describes which memory heap this memory type corresponds
|
|
to, and must: be less than pname:memoryHeapCount from the
|
|
sname:VkPhysicalDeviceMemoryProperties structure.
|
|
* pname:propertyFlags is a bitmask of elink:VkMemoryPropertyFlagBits of
|
|
properties for this memory type.
|
|
|
|
include::../validity/structs/VkMemoryType.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMemoryPropertyFlagBits',desc='Bitmask specifying properties for a memory type',type='enums']
|
|
--
|
|
|
|
Bits which may: be set in slink:VkMemoryType::pname:propertyFlags,
|
|
indicating properties of a memory heap, are:
|
|
|
|
include::../api/enums/VkMemoryPropertyFlagBits.txt[]
|
|
|
|
* ename:VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT bit indicates that memory
|
|
allocated with this type is the most efficient for device access.
|
|
This property will only be set for memory types belonging to heaps with
|
|
the ename:VK_MEMORY_HEAP_DEVICE_LOCAL_BIT set.
|
|
* ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT bit indicates that memory
|
|
allocated with this type can: be mapped for host access using
|
|
flink:vkMapMemory.
|
|
* ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT bit indicates that the host
|
|
cache management commands flink:vkFlushMappedMemoryRanges and
|
|
flink:vkInvalidateMappedMemoryRanges are not needed to flush host writes
|
|
to the device or make device writes visible to the host, respectively.
|
|
* ename:VK_MEMORY_PROPERTY_HOST_CACHED_BIT bit indicates that memory
|
|
allocated with this type is cached on the host.
|
|
Host memory accesses to uncached memory are slower than to cached
|
|
memory, however uncached memory is always host coherent.
|
|
* ename:VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT bit indicates that the
|
|
memory type only allows device access to the memory.
|
|
Memory types must: not have both
|
|
ename:VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT and
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT set.
|
|
Additionally, the object's backing memory may: be provided by the
|
|
implementation lazily as specified in <<memory-device-lazy_allocation,
|
|
Lazily Allocated Memory>>.
|
|
|
|
--
|
|
|
|
[open,refpage='VkDeviceMemory',desc='Opaque handle to a device memory object',type='handles']
|
|
--
|
|
|
|
A Vulkan device operates on data in device memory via memory objects that
|
|
are represented in the API by a sname:VkDeviceMemory handle.
|
|
|
|
Memory objects are represented by sname:VkDeviceMemory handles:
|
|
|
|
include::../api/handles/VkDeviceMemory.txt[]
|
|
|
|
--
|
|
|
|
[open,refpage='vkAllocateMemory',desc='Allocate GPU memory',type='protos']
|
|
--
|
|
|
|
To allocate memory objects, call:
|
|
|
|
include::../api/protos/vkAllocateMemory.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory.
|
|
* pname:pAllocateInfo is a pointer to an instance of the
|
|
slink:VkMemoryAllocateInfo structure describing parameters of the
|
|
allocation.
|
|
A successful returned allocation must: use the requested parameters --
|
|
no substitution is permitted by the implementation.
|
|
* pname:pAllocator controls host memory allocation as described in the
|
|
<<memory-allocation, Memory Allocation>> chapter.
|
|
* pname:pMemory is a pointer to a sname:VkDeviceMemory handle in which
|
|
information about the allocated memory is returned.
|
|
|
|
Allocations returned by fname:vkAllocateMemory are guaranteed to meet any
|
|
alignment requirement by the implementation.
|
|
For example, if an implementation requires 128 byte alignment for images and
|
|
64 byte alignment for buffers, the device memory returned through this
|
|
mechanism would be 128-byte aligned.
|
|
This ensures that applications can: correctly suballocate objects of
|
|
different types (with potentially different alignment requirements) in the
|
|
same memory object.
|
|
|
|
When memory is allocated, its contents are undefined.
|
|
|
|
There is an implementation-dependent maximum number of memory allocations
|
|
which can: be simultaneously created on a device.
|
|
This is specified by the
|
|
<<features-limits-maxMemoryAllocationCount,pname:maxMemoryAllocationCount>>
|
|
member of the sname:VkPhysicalDeviceLimits structure.
|
|
If pname:maxMemoryAllocationCount is exceeded, fname:vkAllocateMemory will
|
|
return ename:VK_ERROR_TOO_MANY_OBJECTS.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
Some platforms may: have a limit on the maximum size of a single allocation.
|
|
For example, certain systems may: fail to create allocations with a size
|
|
greater than or equal to 4GB.
|
|
Such a limit is implementation-dependent, and if such a failure occurs then
|
|
the error ename:VK_ERROR_OUT_OF_DEVICE_MEMORY should: be returned.
|
|
====
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkAllocateMemory-device-00636]]
|
|
The number of currently valid memory objects, allocated from
|
|
pname:device, must: be less than
|
|
sname:VkPhysicalDeviceLimits::pname:maxMemoryAllocationCount
|
|
****
|
|
|
|
include::../validity/protos/vkAllocateMemory.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMemoryAllocateInfo',desc='Structure containing parameters of a memory allocation',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryAllocateInfo structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryAllocateInfo.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:allocationSize is the size of the allocation in bytes
|
|
* pname:memoryTypeIndex is the memory type index, which selects the
|
|
properties of the memory to be allocated, as well as the heap the memory
|
|
will come from.
|
|
|
|
ifdef::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
If the pname:pNext chain contains an instance of
|
|
ifdef::VK_KHR_external_memory_win32[]
|
|
slink:VkImportMemoryWin32HandleInfoKHR with a non-zero value for
|
|
sname:VkImportMemoryWin32HandleInfoKHR::pname:handleType,
|
|
endif::VK_KHR_external_memory_win32[]
|
|
ifdef::VK_KHR_external_memory_win32+VK_KHR_external_memory_fd[]
|
|
or
|
|
endif::VK_KHR_external_memory_win32+VK_KHR_external_memory_fd[]
|
|
ifdef::VK_KHR_external_memory_fd[]
|
|
slink:VkImportMemoryFdInfoKHR with a non-zero value for
|
|
sname:VkImportMemoryFdInfoKHR::pname:handleType,
|
|
endif::VK_KHR_external_memory_fd[]
|
|
the slink:VkMemoryAllocateInfo instance defines a memory import operation.
|
|
Importing memory must: not modify the content of the memory.
|
|
Implementations must: ensure that importing memory does not enable the
|
|
importing Vulkan instance to access any memory or resources in other Vulkan
|
|
instances other than that corresponding to the memory object imported.
|
|
Implementations must: also ensure accessing imported memory which has not
|
|
been initialized does not allow the importing Vulkan instance to obtain data
|
|
from the exporting Vulkan instance or vice-versa.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
How exported and imported memory is isolated is left to the implementation,
|
|
but applications should be aware that such isolation may: prevent
|
|
implementations from placing multiple exportable memory objects in the same
|
|
physical or virtual page.
|
|
Hence, applications should: avoid creating many small external memory
|
|
objects whenever possible.
|
|
====
|
|
|
|
When performing a memory import operation, it is the responsibility of the
|
|
application to ensure the external handles meet all valid usage
|
|
requirements.
|
|
However, implementations must: perform sufficient validation of external
|
|
handles to ensure that the operation results in a valid memory object which
|
|
will not cause program termination, device loss, queue stalls, or corruption
|
|
of other resources when used as allowed according to its allocation
|
|
parameters.
|
|
If the external handle provided does not meet these requirements, the
|
|
implementation must: fail the memory import operation with the error code
|
|
ename:VK_ERROR_INVALID_EXTERNAL_HANDLE_KHR.
|
|
|
|
endif::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkMemoryAllocateInfo-allocationSize-00637]]
|
|
pname:allocationSize must: be less than or equal to the amount of memory
|
|
available to the sname:VkMemoryHeap specified by pname:memoryTypeIndex
|
|
and the calling command's sname:VkDevice
|
|
* [[VUID-VkMemoryAllocateInfo-allocationSize-00638]]
|
|
pname:allocationSize must: be greater than `0`
|
|
ifdef::VK_KHR_external_memory[]
|
|
ifdef::VK_KHR_dedicated_allocation,VK_NV_dedicated_allocation[]
|
|
* [[VUID-VkMemoryAllocateInfo-pNext-00639]]
|
|
If the pname:pNext chain contains an instance of
|
|
sname:VkExportMemoryAllocateInfoKHR, and any of the handle types
|
|
specified in sname:VkExportMemoryAllocateInfoKHR::pname:handleTypes
|
|
require a dedicated allocation, as reported by
|
|
flink:vkGetPhysicalDeviceImageFormatProperties2KHR in
|
|
sname:VkExternalImageFormatPropertiesKHR::pname:externalMemoryProperties::pname:externalMemoryFeatures
|
|
or
|
|
sname:VkExternalBufferPropertiesKHR::pname:externalMemoryProperties::pname:externalMemoryFeatures,
|
|
the pname:pNext chain must contain an instance of
|
|
ifdef::VK_KHR_dedicated_allocation[slink:VkMemoryDedicatedAllocateInfoKHR]
|
|
ifdef::VK_KHR_dedicated_allocation+VK_NV_dedicated_allocation[or]
|
|
ifdef::VK_NV_dedicated_allocation[slink:VkDedicatedAllocationMemoryAllocateInfoNV]
|
|
with either its pname:image or pname:buffer field set to a value other
|
|
than ename:VK_NULL_HANDLE.
|
|
endif::VK_KHR_dedicated_allocation,VK_NV_dedicated_allocation[]
|
|
endif::VK_KHR_external_memory[]
|
|
ifdef::VK_KHR_external_memory+VK_NV_external_memory[]
|
|
* [[VUID-VkMemoryAllocateInfo-pNext-00640]]
|
|
If the pname:pNext chain contains an instance of
|
|
slink:VkExportMemoryAllocateInfoKHR, it must: not contain an instance of
|
|
slink:VkExportMemoryAllocateInfoNV or
|
|
slink:VkExportMemoryWin32HandleInfoNV.
|
|
endif::VK_KHR_external_memory+VK_NV_external_memory[]
|
|
ifdef::VK_KHR_external_memory_win32+VK_NV_external_memory_win32[]
|
|
* [[VUID-VkMemoryAllocateInfo-pNext-00641]]
|
|
If the pname:pNext chain contains an instance of
|
|
slink:VkImportMemoryWin32HandleInfoKHR, it must: not contain an instance
|
|
of slink:VkImportMemoryWin32HandleInfoNV.
|
|
endif::VK_KHR_external_memory_win32+VK_NV_external_memory_win32[]
|
|
ifdef::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
* [[VUID-VkMemoryAllocateInfo-allocationSize-00642]]
|
|
If the parameters define an import operation and the external handle
|
|
specified was created by the Vulkan API, the values of
|
|
pname:allocationSize and pname:memoryTypeIndex must: match those
|
|
specified when the memory object being imported was created.
|
|
endif::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
ifdef::VK_KHR_external_memory+VK_KHX_device_group[]
|
|
* [[VUID-VkMemoryAllocateInfo-None-00643]]
|
|
If the parameters define an import operation and the external handle
|
|
specified was created by the Vulkan API, the device mask specified by
|
|
slink:VkMemoryAllocateFlagsInfoKHX must: match that specified when the
|
|
memory object being imported was allocated.
|
|
* [[VUID-VkMemoryAllocateInfo-None-00644]]
|
|
If the parameters define an import operation and the external handle
|
|
specified was created by the Vulkan API, the list of physical devices
|
|
that comprise the logical device passed to flink:vkAllocateMemory must:
|
|
match the list of physical devices that comprise the logical device on
|
|
which the memory was originally allocated.
|
|
endif::VK_KHR_external_memory+VK_KHX_device_group[]
|
|
ifdef::VK_KHR_external_memory_win32[]
|
|
* [[VUID-VkMemoryAllocateInfo-memoryTypeIndex-00645]]
|
|
If the parameters define an import operation and the external handle is
|
|
an NT handle or a global share handle created outside of the Vulkan API,
|
|
the value of pname:memoryTypeIndex must: be one of those returned by
|
|
flink:vkGetMemoryWin32HandlePropertiesKHR.
|
|
* [[VUID-VkMemoryAllocateInfo-allocationSize-00646]]
|
|
If the parameters define an import operation and the external handle
|
|
type is ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D11_TEXTURE_BIT_KHR,
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D11_TEXTURE_KMT_BIT_KHR, or
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_RESOURCE_BIT_KHR,
|
|
pname:allocationSize must: match the size reported in the memory
|
|
requirements of the pname:image or pname:buffer member of the instance
|
|
of sname:VkDedicatedAllocationMemoryAllocateInfoNV included in the
|
|
pname:pNext chain.
|
|
* [[VUID-VkMemoryAllocateInfo-allocationSize-00647]]
|
|
If the parameters define an import operation and the external handle
|
|
type is ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_HEAP_BIT_KHR,
|
|
pname:allocationSize must: match the size specified when creating the
|
|
Direct3D 12 heap from which the external handle was extracted.
|
|
endif::VK_KHR_external_memory_win32[]
|
|
ifdef::VK_KHR_external_memory_fd[]
|
|
* [[VUID-VkMemoryAllocateInfo-memoryTypeIndex-00648]]
|
|
If the parameters define an import operation and the external handle is
|
|
a POSIX file descriptor created outside of the Vulkan API, the value of
|
|
pname:memoryTypeIndex must: be one of those returned by
|
|
flink:vkGetMemoryFdPropertiesKHR.
|
|
endif::VK_KHR_external_memory_fd[]
|
|
****
|
|
|
|
include::../validity/structs/VkMemoryAllocateInfo.txt[]
|
|
--
|
|
|
|
ifdef::VK_KHR_dedicated_allocation[]
|
|
|
|
[open,refpage='VkMemoryDedicatedAllocateInfoKHR',desc='Specify a dedicated memory allocation resource',type='structs']
|
|
--
|
|
|
|
If the pname:pNext chain includes a sname:VkMemoryDedicatedAllocateInfoKHR
|
|
structure, then that structure includes a handle of the sole buffer or image
|
|
resource that the memory can: be bound to.
|
|
|
|
The sname:VkMemoryDedicatedAllocateInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryDedicatedAllocateInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:image is sname:VK_NULL_HANDLE or a handle of an image which this
|
|
memory will be bound to.
|
|
* pname:buffer is sname:VK_NULL_HANDLE or a handle of a buffer which this
|
|
memory will be bound to.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-image-01432]]
|
|
At least one of pname:image and pname:buffer must: be
|
|
sname:VK_NULL_HANDLE
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-image-01433]]
|
|
If pname:image is not sname:VK_NULL_HANDLE,
|
|
sname:VkMemoryAllocateInfo::pname:allocationSize must: equal the
|
|
sname:VkMemoryRequirements::pname:size of the image
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-image-01434]]
|
|
If pname:image is not sname:VK_NULL_HANDLE, pname:image must: have been
|
|
created without ename:VK_IMAGE_CREATE_SPARSE_BINDING_BIT set in
|
|
sname:VkImageCreateInfo::pname:flags
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-buffer-01435]]
|
|
If pname:buffer is not sname:VK_NULL_HANDLE,
|
|
sname:VkMemoryAllocateInfo::pname:allocationSize must: equal the
|
|
sname:VkMemoryRequirements::pname:size of the buffer
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-buffer-01436]]
|
|
If pname:buffer is not sname:VK_NULL_HANDLE, pname:buffer must: have
|
|
been created without ename:VK_BUFFER_CREATE_SPARSE_BINDING_BIT set in
|
|
sname:VkBufferCreateInfo::pname:flags
|
|
ifdef::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-image-01437]]
|
|
If pname:image is not sname:VK_NULL_HANDLE and
|
|
slink:VkMemoryAllocateInfo defines a memory import operation, the memory
|
|
being imported must: also be a dedicated image allocation and
|
|
pname:image must be identical to the image associated with the imported
|
|
memory.
|
|
* [[VUID-VkMemoryDedicatedAllocateInfoKHR-buffer-01438]]
|
|
If pname:buffer is not sname:VK_NULL_HANDLE and
|
|
slink:VkMemoryAllocateInfo defines a memory import operation, the memory
|
|
being imported must: also be a dedicated buffer allocation and
|
|
pname:buffer must be identical to the buffer associated with the
|
|
imported memory.
|
|
endif::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
****
|
|
|
|
include::../validity/structs/VkMemoryDedicatedAllocateInfoKHR.txt[]
|
|
--
|
|
|
|
endif::VK_KHR_dedicated_allocation[]
|
|
|
|
ifdef::VK_NV_dedicated_allocation[]
|
|
|
|
[open,refpage='VkDedicatedAllocationMemoryAllocateInfoNV',desc='Specify a dedicated memory allocation resource',type='structs']
|
|
--
|
|
|
|
If the pname:pNext chain includes a
|
|
sname:VkDedicatedAllocationMemoryAllocateInfoNV structure, then that
|
|
structure includes a handle of the sole buffer or image resource that the
|
|
memory can: be bound to.
|
|
|
|
The sname:VkDedicatedAllocationMemoryAllocateInfoNV structure is defined as:
|
|
|
|
include::../api/structs/VkDedicatedAllocationMemoryAllocateInfoNV.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:image is sname:VK_NULL_HANDLE or a handle of an image which this
|
|
memory will be bound to.
|
|
* pname:buffer is sname:VK_NULL_HANDLE or a handle of a buffer which this
|
|
memory will be bound to.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-image-00649]]
|
|
At least one of pname:image and pname:buffer must: be
|
|
sname:VK_NULL_HANDLE
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-image-00650]]
|
|
If pname:image is not sname:VK_NULL_HANDLE, the image must: have been
|
|
created with
|
|
sname:VkDedicatedAllocationImageCreateInfoNV::pname:dedicatedAllocation
|
|
equal to ename:VK_TRUE
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-buffer-00651]]
|
|
If pname:buffer is not sname:VK_NULL_HANDLE, the buffer must: have been
|
|
created with
|
|
sname:VkDedicatedAllocationBufferCreateInfoNV::pname:dedicatedAllocation
|
|
equal to ename:VK_TRUE
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-image-00652]]
|
|
If pname:image is not sname:VK_NULL_HANDLE,
|
|
sname:VkMemoryAllocateInfo::pname:allocationSize must: equal the
|
|
sname:VkMemoryRequirements::pname:size of the image
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-buffer-00653]]
|
|
If pname:buffer is not sname:VK_NULL_HANDLE,
|
|
sname:VkMemoryAllocateInfo::pname:allocationSize must: equal the
|
|
sname:VkMemoryRequirements::pname:size of the buffer
|
|
ifdef::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-image-00654]]
|
|
If pname:image is not sname:VK_NULL_HANDLE and
|
|
slink:VkMemoryAllocateInfo defines a memory import operation, the memory
|
|
being imported must: also be a dedicated image allocation and
|
|
pname:image must: be identical to the image associated with the imported
|
|
memory.
|
|
* [[VUID-VkDedicatedAllocationMemoryAllocateInfoNV-buffer-00655]]
|
|
If pname:buffer is not sname:VK_NULL_HANDLE and
|
|
slink:VkMemoryAllocateInfo defines a memory import operation, the memory
|
|
being imported must: also be a dedicated buffer allocation and
|
|
pname:buffer must: be identical to the buffer associated with the
|
|
imported memory.
|
|
endif::VK_KHR_external_memory_win32,VK_KHR_external_memory_fd[]
|
|
****
|
|
|
|
include::../validity/structs/VkDedicatedAllocationMemoryAllocateInfoNV.txt[]
|
|
--
|
|
|
|
endif::VK_NV_dedicated_allocation[]
|
|
|
|
ifdef::VK_KHR_external_memory[]
|
|
|
|
[open,refpage='VkExportMemoryAllocateInfoKHR',desc='Specify exportable handle types for a device memory object',type='structs']
|
|
--
|
|
|
|
When allocating memory that may: be exported to another process or Vulkan
|
|
instance, add a slink:VkExportMemoryAllocateInfoKHR structure to the
|
|
pname:pNext chain of the slink:VkMemoryAllocateInfo structure, specifying
|
|
the handle types that may: be exported.
|
|
|
|
The slink:VkExportMemoryAllocateInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkExportMemoryAllocateInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:handleTypes is a bitmask of
|
|
elink:VkExternalMemoryHandleTypeFlagBitsKHR specifying one or more
|
|
memory handle types the application can: export from the resulting
|
|
allocation.
|
|
The application can: request multiple handle types for the same
|
|
allocation.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkExportMemoryAllocateInfoKHR-handleTypes-00656]]
|
|
The bits in pname:handleTypes must: be supported and compatible, as
|
|
reported by slink:VkExternalImageFormatPropertiesKHR or
|
|
slink:VkExternalBufferPropertiesKHR.
|
|
****
|
|
|
|
include::../validity/structs/VkExportMemoryAllocateInfoKHR.txt[]
|
|
--
|
|
|
|
endif::VK_KHR_external_memory[]
|
|
|
|
ifdef::VK_KHR_external_memory_win32[]
|
|
|
|
[open,refpage='VkExportMemoryWin32HandleInfoKHR',desc='Structure specifying additional attributes of Windows handles exported from a memory',type='structs']
|
|
--
|
|
|
|
To specify additional attributes of NT handles exported from a memory
|
|
object, add the slink:VkExportMemoryWin32HandleInfoKHR structure to the
|
|
pname:pNext chain of the slink:VkMemoryAllocateInfo structure.
|
|
The sname:VkExportMemoryWin32HandleInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkExportMemoryWin32HandleInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:pAttributes is a pointer to a Windows code:SECURITY_ATTRIBUTES
|
|
structure specifying security attributes of the handle.
|
|
* pname:dwAccess is a code:DWORD specifying access rights of the handle.
|
|
* pname:name is a NULL-terminated UTF-16 string to associate with the
|
|
underlying resource referenced by NT handles exported from the created
|
|
memory.
|
|
|
|
If this structure is not present, or if pname:pAttributes is set to `NULL`,
|
|
default security descriptor values will be used, and child processes created
|
|
by the application will not inherit the handle, as described in the MSDN
|
|
documentation for "`Synchronization Object Security and Access Rights`"^1^.
|
|
Further, if the structure is not present, the access rights will be
|
|
|
|
code:DXGI_SHARED_RESOURCE_READ | code:DXGI_SHARED_RESOURCE_WRITE
|
|
|
|
for handles of the following types:
|
|
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_BIT_KHR
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D11_TEXTURE_BIT_KHR
|
|
|
|
And
|
|
|
|
code:GENERIC_ALL
|
|
|
|
for handles of the following types:
|
|
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_HEAP_BIT_KHR
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_RESOURCE_BIT_KHR
|
|
|
|
1::
|
|
https://msdn.microsoft.com/en-us/library/windows/desktop/ms686670.aspx
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkExportMemoryWin32HandleInfoKHR-handleTypes-00657]]
|
|
If slink:VkExportMemoryAllocateInfoKHR::pname:handleTypes does not
|
|
include ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_BIT_KHR,
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D11_TEXTURE_BIT_KHR,
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_HEAP_BIT_KHR, or
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_RESOURCE_BIT_KHR,
|
|
VkExportMemoryWin32HandleInfoKHR must: not be in the pname:pNext chain
|
|
of slink:VkMemoryAllocateInfo.
|
|
****
|
|
|
|
include::../validity/structs/VkExportMemoryWin32HandleInfoKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='VkImportMemoryWin32HandleInfoKHR',desc='import Win32 memory created on the same physical device',type='structs']
|
|
--
|
|
|
|
To import memory from a Windows handle, add a
|
|
slink:VkImportMemoryWin32HandleInfoKHR structure to the pname:pNext chain of
|
|
the slink:VkMemoryAllocateInfo structure.
|
|
|
|
The sname:VkImportMemoryWin32HandleInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkImportMemoryWin32HandleInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:handleType specifies the type of pname:handle or pname:name.
|
|
* pname:handle is the external handle to import, or `NULL`.
|
|
* pname:name is a NULL-terminated UTF-16 string naming the underlying
|
|
memory resource to import, or `NULL`.
|
|
|
|
Importing memory objects from Windows handles does not transfer ownership of
|
|
the handle to the Vulkan implementation.
|
|
For handle types defined as NT handles, the application must: release
|
|
ownership using the fname:CloseHandle system call when the handle is no
|
|
longer needed.
|
|
|
|
Applications can: import the same underlying memory into multiple instances
|
|
of Vulkan, into the same instance from which it was exported, and multiple
|
|
times into a given Vulkan instance.
|
|
In all cases, each import operation must: create a distinct
|
|
sname:VkDeviceMemory object.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handleType-00658]]
|
|
If pname:handleType is not `0`, it must: be supported for import, as
|
|
reported by slink:VkExternalImageFormatPropertiesKHR or
|
|
slink:VkExternalBufferPropertiesKHR.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handle-00659]]
|
|
The memory from which pname:handle was exported, or the memory named by
|
|
pname:name must: have been created on the same underlying physical
|
|
device as pname:device.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handleType-00660]]
|
|
If pname:handleType is not `0`, it must: be defined as an NT handle or a
|
|
global share handle.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handleType-01439]]
|
|
If pname:handleType is not
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_BIT_KHR,
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D11_TEXTURE_BIT_KHR,
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_HEAP_BIT_KHR, or
|
|
ename:VK_EXTERNAL_MEMORY_HANDLE_TYPE_D3D12_RESOURCE_BIT_KHR, pname:name
|
|
must: be `NULL`.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handleType-01440]]
|
|
If pname:handleType is not `0` and pname:handle is `NULL`, pname:name
|
|
must: name a valid memory resource of the type specified by
|
|
pname:handleType.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handleType-00661]]
|
|
If pname:handleType is not `0` and pname:name is `NULL`, pname:handle
|
|
must: be a valid handle of the type specified by pname:handleType.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handle-01441]]
|
|
if pname:handle is not `NULL`, pname:name must be `NULL`.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-handle-01518]]
|
|
If pname:handle is not `NULL`, it must: obey any requirements listed for
|
|
pname:handleType in
|
|
<<external-memory-handle-types-compatibility,external memory handle
|
|
types compatibility>>.
|
|
* [[VUID-VkImportMemoryWin32HandleInfoKHR-name-01519]]
|
|
If pname:name is not `NULL`, it must: obey any requirements listed for
|
|
pname:handleType in
|
|
<<external-memory-handle-types-compatibility,external memory handle
|
|
types compatibility>>.
|
|
****
|
|
|
|
include::../validity/structs/VkImportMemoryWin32HandleInfoKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='vkGetMemoryWin32HandleKHR',desc='Get a Windows HANDLE for a memory object',type='protos']
|
|
--
|
|
|
|
To export a Windows handle representing the underlying resources of a Vulkan
|
|
device memory object, call:
|
|
|
|
include::../api/protos/vkGetMemoryWin32HandleKHR.txt[]
|
|
|
|
* pname:device is the logical device that created the device memory being
|
|
exported.
|
|
* pname:pGetWin32HandleInfo is a pointer to an instance of the
|
|
slink:VkMemoryGetWin32HandleInfoKHR structure containing parameters of
|
|
the export operation.
|
|
* pname:pHandle will return the Windows handle representing the underlying
|
|
resources of the device memory object.
|
|
|
|
For handle types defined as NT handles, the handles returned by
|
|
fname:vkGetMemoryWin32HandleKHR are owned by the application.
|
|
To avoid leaking resources, the application must: release ownership of them
|
|
using the fname:CloseHandle system call when they are no longer needed.
|
|
|
|
include::../validity/protos/vkGetMemoryWin32HandleKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMemoryGetWin32HandleInfoKHR',desc='Structure describing a Win32 handle semaphore export operation',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryGetWin32HandleInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryGetWin32HandleInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:memory is the memory object from which the handle will be
|
|
exported.
|
|
* pname:handleType is the type of handle requested.
|
|
|
|
The properties of the handle returned depend on the value of
|
|
pname:handleType.
|
|
See elink:VkExternalMemoryHandleTypeFlagBitsKHR for a description of the
|
|
properties of the defined external memory handle types.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkGetMemoryWin32HandleKHR-handleType-00662]]
|
|
pname:handleType must: have been included in
|
|
slink:VkExportMemoryAllocateInfoKHR::pname:handleTypes when pname:memory
|
|
was created.
|
|
* [[VUID-vkGetMemoryWin32HandleKHR-handleType-00663]]
|
|
If pname:handleType is defined as an NT handle,
|
|
flink:vkGetMemoryWin32HandleKHR must: be called no more than once for
|
|
each valid unique combination of pname:memory and pname:handleType.
|
|
* [[VUID-vkGetMemoryWin32HandleKHR-handleType-00664]]
|
|
pname:handleType must: be defined as an NT handle or a global share
|
|
handle.
|
|
****
|
|
|
|
include::../validity/structs/VkMemoryGetWin32HandleInfoKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='vkGetMemoryWin32HandlePropertiesKHR',desc='Get Properties of External Memory Win32 Handles',type='protos']
|
|
--
|
|
|
|
Windows memory handles compatible with Vulkan may: also be created by
|
|
non-Vulkan APIs using methods beyond the scope of this specification.
|
|
To determine the correct parameters to use when importing such handles,
|
|
call:
|
|
|
|
include::../api/protos/vkGetMemoryWin32HandlePropertiesKHR.txt[]
|
|
|
|
* pname:device is the logical device that will be importing pname:handle.
|
|
* pname:handleType is the type of the handle pname:handle.
|
|
* pname:handle is the handle which will be imported.
|
|
* pname:pMemoryWin32HandleProperties will return properties of
|
|
pname:handle.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkGetMemoryWin32HandlePropertiesKHR-handle-00665]]
|
|
pname:handle must: be an external memory handle created outside of the
|
|
Vulkan API.
|
|
* [[VUID-vkGetMemoryWin32HandlePropertiesKHR-handleType-00666]]
|
|
pname:handleType must: not be one of the handle types defined as opaque.
|
|
****
|
|
|
|
include::../validity/protos/vkGetMemoryWin32HandlePropertiesKHR.txt[]
|
|
|
|
--
|
|
|
|
[open,refpage='VkMemoryWin32HandlePropertiesKHR',desc='Properties of External Memory Windows Handles',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryWin32HandlePropertiesKHR structure returned is defined as:
|
|
|
|
include::../api/structs/VkMemoryWin32HandlePropertiesKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:memoryTypeBits is a bitmask containing one bit set for every
|
|
memory type which the specified windows handle can: be imported as.
|
|
|
|
--
|
|
|
|
endif::VK_KHR_external_memory_win32[]
|
|
|
|
ifdef::VK_KHR_external_memory_fd[]
|
|
|
|
[open,refpage='VkImportMemoryFdInfoKHR',desc='import memory created on the same physical device from a file descriptor',type='structs']
|
|
--
|
|
|
|
To import memory from a POSIX file descriptor handle, add a
|
|
slink:VkImportMemoryFdInfoKHR structure to the pname:pNext chain of the
|
|
slink:VkMemoryAllocateInfo structure.
|
|
The sname:VkImportMemoryFdInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkImportMemoryFdInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:handleType specifies the handle type of pname:fd.
|
|
* pname:fd is the external handle to import.
|
|
|
|
Importing memory from a file descriptor transfers ownership of the file
|
|
descriptor from the application to the Vulkan implementation.
|
|
The application must: not perform any operations on the file descriptor
|
|
after a successful import.
|
|
|
|
Applications can: import the same underlying memory into multiple instances
|
|
of Vulkan, into the same instance from which it was exported, and multiple
|
|
times into a given Vulkan instance.
|
|
In all cases, each import operation must: create a distinct
|
|
sname:VkDeviceMemory object.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkImportMemoryFdInfoKHR-handleType-00667]]
|
|
If pname:handleType is not `0`, it must: be supported for import, as
|
|
reported by slink:VkExternalImageFormatPropertiesKHR or
|
|
slink:VkExternalBufferPropertiesKHR.
|
|
* [[VUID-VkImportMemoryFdInfoKHR-fd-00668]]
|
|
The memory from which pname:fd was exported must: have been created on
|
|
the same underlying physical device as pname:device.
|
|
* [[VUID-VkImportMemoryFdInfoKHR-handleType-00669]]
|
|
If pname:handleType is not `0`, it must: be defined as a POSIX file
|
|
descriptor handle.
|
|
* [[VUID-VkImportMemoryFdInfoKHR-handleType-00670]]
|
|
If pname:handleType is not `0`, pname:fd must: be a valid handle of the
|
|
type specified by pname:handleType.
|
|
* [[VUID-VkImportMemoryFdInfoKHR-fd-01520]]
|
|
pname:fd must: obey any requirements listed for pname:handleType in
|
|
<<external-memory-handle-types-compatibility,external memory handle
|
|
types compatibility>>.
|
|
****
|
|
|
|
include::../validity/structs/VkImportMemoryFdInfoKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='vkGetMemoryFdKHR',desc='Get a POSIX file descriptor for a memory object',type='protos']
|
|
--
|
|
|
|
To export a POSIX file descriptor representing the underlying resources of a
|
|
Vulkan device memory object, call:
|
|
|
|
include::../api/protos/vkGetMemoryFdKHR.txt[]
|
|
|
|
* pname:device is the logical device that created the device memory being
|
|
exported.
|
|
* pname:pGetFdInfo is a pointer to an instance of the
|
|
slink:VkMemoryGetFdInfoKHR structure containing parameters of the export
|
|
operation.
|
|
* pname:pFd will return a file descriptor representing the underlying
|
|
resources of the device memory object.
|
|
|
|
Each call to fname:vkGetMemoryFdKHR must: create a new file descriptor and
|
|
transfer ownership of it to the application.
|
|
To avoid leaking resources, the application must: release ownership of the
|
|
file descriptor using the fname:close system call when it is no longer
|
|
needed, or by importing a Vulkan memory object from it.
|
|
Where supported by the operating system, the implementation must: set the
|
|
file descriptor to be closed automatically when an fname:execve system call
|
|
is made.
|
|
|
|
include::../validity/protos/vkGetMemoryFdKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMemoryGetFdInfoKHR',desc='Structure describing a POSIX FD semaphore export operation',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryGetFdInfoKHR structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryGetFdInfoKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:memory is the memory object from which the handle will be
|
|
exported.
|
|
* pname:handleType is the type of handle requested.
|
|
|
|
The properties of the file descriptor exported depend on the value of
|
|
pname:handleType.
|
|
See elink:VkExternalMemoryHandleTypeFlagBitsKHR for a description of the
|
|
properties of the defined external memory handle types.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkGetMemoryFdKHR-handleType-00671]]
|
|
pname:handleType must: have been included in
|
|
slink:VkExportMemoryAllocateInfoKHR::pname:handleTypes when pname:memory
|
|
was created.
|
|
* [[VUID-vkGetMemoryFdKHR-handleType-00672]]
|
|
pname:handleType must: be defined as a POSIX file descriptor handle.
|
|
****
|
|
|
|
include::../validity/structs/VkMemoryGetFdInfoKHR.txt[]
|
|
--
|
|
|
|
[open,refpage='vkGetMemoryFdPropertiesKHR',desc='Get Properties of External Memory File Descriptors',type='protos']
|
|
--
|
|
|
|
POSIX file descriptor memory handles compatible with Vulkan may: also be
|
|
created by non-Vulkan APIs using methods beyond the scope of this
|
|
specification.
|
|
To determine the correct parameters to use when importing such handles,
|
|
call:
|
|
|
|
include::../api/protos/vkGetMemoryFdPropertiesKHR.txt[]
|
|
|
|
* pname:device is the logical device that will be importing pname:fd.
|
|
* pname:handleType is the type of the handle pname:fd.
|
|
* pname:fd is the handle which will be imported.
|
|
* pname:pMemoryFdProperties will return properties of the handle pname:fd.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkGetMemoryFdPropertiesKHR-fd-00673]]
|
|
pname:fd must: be an external memory handle created outside of the
|
|
Vulkan API.
|
|
* [[VUID-vkGetMemoryFdPropertiesKHR-handleType-00674]]
|
|
pname:handleType must: not be one of the handle types defined as opaque.
|
|
****
|
|
|
|
include::../validity/protos/vkGetMemoryFdPropertiesKHR.txt[]
|
|
|
|
--
|
|
|
|
[open,refpage='VkMemoryFdPropertiesKHR',desc='Properties of External Memory File Descriptors',type='structs']
|
|
--
|
|
|
|
The sname:VkMemoryFdPropertiesKHR structure returned is defined as:
|
|
|
|
include::../api/structs/VkMemoryFdPropertiesKHR.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:memoryTypeBits is a bitmask containing one bit set for every
|
|
memory type which the specified file descriptor can: be imported as.
|
|
|
|
--
|
|
|
|
endif::VK_KHR_external_memory_fd[]
|
|
|
|
ifdef::VK_NV_external_memory[]
|
|
include::VK_NV_external_memory/allocate_memory.txt[]
|
|
endif::VK_NV_external_memory[]
|
|
|
|
ifdef::VK_NV_external_memory_win32[]
|
|
|
|
include::VK_NV_external_memory_win32/handle_permissions.txt[]
|
|
|
|
include::VK_NV_external_memory_win32/import_memory_win32.txt[]
|
|
|
|
include::VK_NV_external_memory_win32/get_handle_win32.txt[]
|
|
|
|
endif::VK_NV_external_memory_win32[]
|
|
|
|
ifdef::VK_KHX_device_group[]
|
|
|
|
[open,refpage='VkMemoryAllocateFlagsInfoKHX',desc='Structure controlling how many instances of memory will be allocated',type='structs']
|
|
--
|
|
|
|
If the pname:pNext chain of slink:VkMemoryAllocateInfo includes a
|
|
sname:VkMemoryAllocateFlagsInfoKHX structure, then that structure includes
|
|
flags and a device mask controlling how many instances of the memory will be
|
|
allocated.
|
|
|
|
The sname:VkMemoryAllocateFlagsInfoKHX structure is defined as:
|
|
|
|
include::../api/structs/VkMemoryAllocateFlagsInfoKHX.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:flags is a bitmask of elink:VkMemoryAllocateFlagBitsKHX
|
|
controlling the allocation.
|
|
* pname:deviceMask is a mask of physical devices in the logical device,
|
|
indicating that memory must: be allocated on each device in the mask, if
|
|
ename:VK_MEMORY_ALLOCATE_DEVICE_MASK_BIT_KHX is set in pname:flags.
|
|
|
|
If ename:VK_MEMORY_ALLOCATE_DEVICE_MASK_BIT_KHX is not set, the number of
|
|
instances allocated depends on whether
|
|
ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHX is set in the memory heap.
|
|
If ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHX is set, then memory is
|
|
allocated for every physical device in the logical device (as if
|
|
pname:deviceMask has bits set for all device indices).
|
|
If ename:VK_MEMORY_HEAP_MULTI_INSTANCE_BIT_KHX is not set, then a single
|
|
instance of memory is allocated (as if pname:deviceMask is set to one).
|
|
|
|
On some implementations, allocations from a multi-instance heap may: consume
|
|
memory on all physical devices even if the pname:deviceMask excludes some
|
|
devices.
|
|
If slink:VkPhysicalDeviceGroupPropertiesKHX::pname:subsetAllocation is
|
|
ename:VK_TRUE, then memory is only consumed for the devices in the device
|
|
mask.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
In practice, most allocations on a multi-instance heap will be allocated
|
|
across all physical devices.
|
|
Unicast allocation support is an optional optimization for a minority of
|
|
allocations.
|
|
====
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkMemoryAllocateFlagsInfoKHX-deviceMask-00675]]
|
|
If ename:VK_MEMORY_ALLOCATE_DEVICE_MASK_BIT_KHX is set, pname:deviceMask
|
|
must: be a valid device mask.
|
|
* [[VUID-VkMemoryAllocateFlagsInfoKHX-deviceMask-00676]]
|
|
If ename:VK_MEMORY_ALLOCATE_DEVICE_MASK_BIT_KHX is set, pname:deviceMask
|
|
must: not be zero
|
|
****
|
|
|
|
include::../validity/structs/VkMemoryAllocateFlagsInfoKHX.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMemoryAllocateFlagBitsKHX',desc='Bitmask specifying flags for a device memory allocation',type='enums']
|
|
--
|
|
|
|
Bits which can: be set in slink:VkMemoryAllocateFlagsInfoKHX::pname:flags,
|
|
controlling device memory allocation, are:
|
|
|
|
include::../api/enums/VkMemoryAllocateFlagBitsKHX.txt[]
|
|
|
|
* ename:VK_MEMORY_ALLOCATE_DEVICE_MASK_BIT_KHX specifies that memory will
|
|
be allocated for the devices in
|
|
slink:VkMemoryAllocateFlagsInfoKHX::pname:deviceMask.
|
|
|
|
--
|
|
|
|
endif::VK_KHX_device_group[]
|
|
|
|
[open,refpage='vkFreeMemory',desc='Free GPU memory',type='protos']
|
|
--
|
|
|
|
To free a memory object, call:
|
|
|
|
include::../api/protos/vkFreeMemory.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory.
|
|
* pname:memory is the sname:VkDeviceMemory object to be freed.
|
|
* pname:pAllocator controls host memory allocation as described in the
|
|
<<memory-allocation, Memory Allocation>> chapter.
|
|
|
|
Before freeing a memory object, an application must: ensure the memory
|
|
object is no longer in use by the device--for example by command buffers
|
|
queued for execution.
|
|
The memory can: remain bound to images or buffers at the time the memory
|
|
object is freed, but any further use of them (on host or device) for
|
|
anything other than destroying those objects will result in undefined
|
|
behavior.
|
|
If there are still any bound images or buffers, the memory may: not be
|
|
immediately released by the implementation, but must: be released by the
|
|
time all bound images and buffers have been destroyed.
|
|
Once memory is released, it is returned to the heap from which it was
|
|
allocated.
|
|
|
|
How memory objects are bound to Images and Buffers is described in detail in
|
|
the <<resources-association, Resource Memory Association>> section.
|
|
|
|
If a memory object is mapped at the time it is freed, it is implicitly
|
|
unmapped.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
As described <<memory-device-unmap-does-not-flush, below>>, host writes are
|
|
not implicitly flushed when the memory object is unmapped, but the
|
|
implementation must: guarantee that writes that have not been flushed do not
|
|
affect any other memory.
|
|
====
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkFreeMemory-memory-00677]]
|
|
All submitted commands that refer to pname:memory (via images or
|
|
buffers) must: have completed execution
|
|
****
|
|
|
|
include::../validity/protos/vkFreeMemory.txt[]
|
|
--
|
|
|
|
|
|
[[memory-device-hostaccess]]
|
|
=== Host Access to Device Memory Objects
|
|
|
|
Memory objects created with fname:vkAllocateMemory are not directly host
|
|
accessible.
|
|
|
|
Memory objects created with the memory property
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT are considered _mappable_.
|
|
Memory objects must: be mappable in order to be successfully mapped on the
|
|
host.
|
|
|
|
[open,refpage='vkMapMemory',desc='Map a memory object into application address space',type='protos']
|
|
--
|
|
|
|
To retrieve a host virtual address pointer to a region of a mappable memory
|
|
object, call:
|
|
|
|
include::../api/protos/vkMapMemory.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory.
|
|
* pname:memory is the sname:VkDeviceMemory object to be mapped.
|
|
* pname:offset is a zero-based byte offset from the beginning of the
|
|
memory object.
|
|
* pname:size is the size of the memory range to map, or
|
|
ename:VK_WHOLE_SIZE to map from pname:offset to the end of the
|
|
allocation.
|
|
* pname:flags is reserved for future use.
|
|
* pname:ppData points to a pointer in which is returned a host-accessible
|
|
pointer to the beginning of the mapped range.
|
|
This pointer minus pname:offset must: be aligned to at least
|
|
sname:VkPhysicalDeviceLimits::pname:minMemoryMapAlignment.
|
|
|
|
It is an application error to call fname:vkMapMemory on a memory object that
|
|
is already mapped.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
fname:vkMapMemory will fail if the implementation is unable to allocate an
|
|
appropriately sized contiguous virtual address range, e.g. due to virtual
|
|
address space fragmentation or platform limits.
|
|
In such cases, fname:vkMapMemory must: return
|
|
ename:VK_ERROR_MEMORY_MAP_FAILED.
|
|
The application can: improve the likelihood of success by reducing the size
|
|
of the mapped range and/or removing unneeded mappings using
|
|
fname:VkUnmapMemory.
|
|
====
|
|
|
|
[[memory-device-hostaccess-hazards]]
|
|
fname:vkMapMemory does not check whether the device memory is currently in
|
|
use before returning the host-accessible pointer.
|
|
The application must: guarantee that any previously submitted command that
|
|
writes to this range has completed before the host reads from or writes to
|
|
that range, and that any previously submitted command that reads from that
|
|
range has completed before the host writes to that region (see
|
|
<<synchronization-submission-host-writes, here>> for details on fulfilling
|
|
such a guarantee).
|
|
If the device memory was allocated without the
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT set, these guarantees must: be
|
|
made for an extended range: the application must: round down the start of
|
|
the range to the nearest multiple of
|
|
sname:VkPhysicalDeviceLimits::pname:nonCoherentAtomSize, and round the end
|
|
of the range up to the nearest multiple of
|
|
sname:VkPhysicalDeviceLimits::pname:nonCoherentAtomSize.
|
|
|
|
While a range of device memory is mapped for host access, the application is
|
|
responsible for synchronizing both device and host access to that memory
|
|
range.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
It is important for the application developer to become meticulously
|
|
familiar with all of the mechanisms described in the chapter on
|
|
<<synchronization, Synchronization and Cache Control>> as they are crucial
|
|
to maintaining memory access ordering.
|
|
====
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkMapMemory-memory-00678]]
|
|
pname:memory must: not be currently mapped
|
|
* [[VUID-vkMapMemory-offset-00679]]
|
|
pname:offset must: be less than the size of pname:memory
|
|
* [[VUID-vkMapMemory-size-00680]]
|
|
If pname:size is not equal to ename:VK_WHOLE_SIZE, pname:size must: be
|
|
greater than `0`
|
|
* [[VUID-vkMapMemory-size-00681]]
|
|
If pname:size is not equal to ename:VK_WHOLE_SIZE, pname:size must: be
|
|
less than or equal to the size of the pname:memory minus pname:offset
|
|
* [[VUID-vkMapMemory-memory-00682]]
|
|
pname:memory must: have been created with a memory type that reports
|
|
ename:VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT
|
|
ifdef::VK_KHX_device_group[]
|
|
* [[VUID-vkMapMemory-memory-00683]]
|
|
pname:memory must: not have been allocated with multiple instances.
|
|
endif::VK_KHX_device_group[]
|
|
****
|
|
|
|
include::../validity/protos/vkMapMemory.txt[]
|
|
--
|
|
|
|
Two commands are provided to enable applications to work with non-coherent
|
|
memory allocations: fname:vkFlushMappedMemoryRanges and
|
|
fname:vkInvalidateMappedMemoryRanges.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
If the memory object was created with the
|
|
ename:VK_MEMORY_PROPERTY_HOST_COHERENT_BIT set,
|
|
fname:vkFlushMappedMemoryRanges and fname:vkInvalidateMappedMemoryRanges are
|
|
unnecessary and may: have a performance cost.
|
|
However, <<synchronization-dependencies-available-and-visible, availability
|
|
and visibility operations>> still need to be managed on the device.
|
|
See the description of <<synchronization-host-access-types, host access
|
|
types>> for more information.
|
|
====
|
|
|
|
[open,refpage='vkFlushMappedMemoryRanges',desc='Flush mapped memory ranges',type='protos']
|
|
--
|
|
|
|
To flush ranges of non-coherent memory from the host caches, call:
|
|
|
|
include::../api/protos/vkFlushMappedMemoryRanges.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory ranges.
|
|
* pname:memoryRangeCount is the length of the pname:pMemoryRanges array.
|
|
* pname:pMemoryRanges is a pointer to an array of
|
|
slink:VkMappedMemoryRange structures describing the memory ranges to
|
|
flush.
|
|
|
|
fname:vkFlushMappedMemoryRanges guarantees that host writes to the memory
|
|
ranges described by pname:pMemoryRanges can: be made available to device
|
|
access, via <<synchronization-dependencies-available-and-visible,
|
|
availability operations>> from the ename:VK_ACCESS_HOST_WRITE_BIT
|
|
<<synchronization-access-types,access type>>.
|
|
|
|
[[memory-device-unmap-does-not-flush]]
|
|
Unmapping non-coherent memory does not implicitly flush the mapped memory,
|
|
and host writes that have not been flushed may: not ever be visible to the
|
|
device.
|
|
However, implementations must: ensure that writes that have not been flushed
|
|
do not become visible to any other memory.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
The above guarantee avoids a potential memory corruption in scenarios where
|
|
host writes to a mapped memory object have not been flushed before the
|
|
memory is unmapped (or freed), and the virtual address range is subsequently
|
|
reused for a different mapping (or memory allocation).
|
|
====
|
|
|
|
include::../validity/protos/vkFlushMappedMemoryRanges.txt[]
|
|
--
|
|
|
|
[open,refpage='vkInvalidateMappedMemoryRanges',desc='Invalidate ranges of mapped memory objects',type='protos']
|
|
--
|
|
|
|
To invalidate ranges of non-coherent memory from the host caches, call:
|
|
|
|
include::../api/protos/vkInvalidateMappedMemoryRanges.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory ranges.
|
|
* pname:memoryRangeCount is the length of the pname:pMemoryRanges array.
|
|
* pname:pMemoryRanges is a pointer to an array of
|
|
slink:VkMappedMemoryRange structures describing the memory ranges to
|
|
invalidate.
|
|
|
|
fname:vkInvalidateMappedMemoryRanges guarantees that device writes to the
|
|
memory ranges described by pname:pMemoryRanges, which have been made visible
|
|
to the ename:VK_ACCESS_HOST_WRITE_BIT and ename:VK_ACCESS_HOST_READ_BIT
|
|
<<synchronization-access-types, access types>>, are made visible to the
|
|
host.
|
|
If a range of non-coherent memory is written by the host and then
|
|
invalidated without first being flushed, its contents are undefined.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
Mapping non-coherent memory does not implicitly invalidate the mapped
|
|
memory, and device writes that have not been invalidated must: be made
|
|
visible before the host reads or overwrites them.
|
|
====
|
|
|
|
include::../validity/protos/vkInvalidateMappedMemoryRanges.txt[]
|
|
--
|
|
|
|
[open,refpage='VkMappedMemoryRange',desc='Structure specifying a mapped memory range',type='structs']
|
|
--
|
|
|
|
The sname:VkMappedMemoryRange structure is defined as:
|
|
|
|
include::../api/structs/VkMappedMemoryRange.txt[]
|
|
|
|
* pname:sType is the type of this structure.
|
|
* pname:pNext is `NULL` or a pointer to an extension-specific structure.
|
|
* pname:memory is the memory object to which this range belongs.
|
|
* pname:offset is the zero-based byte offset from the beginning of the
|
|
memory object.
|
|
* pname:size is either the size of range, or ename:VK_WHOLE_SIZE to affect
|
|
the range from pname:offset to the end of the current mapping of the
|
|
allocation.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-VkMappedMemoryRange-memory-00684]]
|
|
pname:memory must: be currently mapped
|
|
* [[VUID-VkMappedMemoryRange-size-00685]]
|
|
If pname:size is not equal to ename:VK_WHOLE_SIZE, pname:offset and
|
|
pname:size must: specify a range contained within the currently mapped
|
|
range of pname:memory
|
|
* [[VUID-VkMappedMemoryRange-size-00686]]
|
|
If pname:size is equal to ename:VK_WHOLE_SIZE, pname:offset must: be
|
|
within the currently mapped range of pname:memory
|
|
* [[VUID-VkMappedMemoryRange-size-01389]]
|
|
If pname:size is equal to ename:VK_WHOLE_SIZE, the end of the current
|
|
mapping of pname:memory must: be a multiple of
|
|
sname:VkPhysicalDeviceLimits::pname:nonCoherentAtomSize bytes from the
|
|
beginning of the memory object.
|
|
* [[VUID-VkMappedMemoryRange-offset-00687]]
|
|
pname:offset must: be a multiple of
|
|
sname:VkPhysicalDeviceLimits::pname:nonCoherentAtomSize
|
|
* [[VUID-VkMappedMemoryRange-size-01390]]
|
|
If pname:size is not equal to ename:VK_WHOLE_SIZE, pname:size must:
|
|
either be a multiple of
|
|
sname:VkPhysicalDeviceLimits::pname:nonCoherentAtomSize, or pname:offset
|
|
plus pname:size must: equal the size of pname:memory.
|
|
****
|
|
|
|
include::../validity/structs/VkMappedMemoryRange.txt[]
|
|
--
|
|
|
|
|
|
[open,refpage='vkUnmapMemory',desc='Unmap a previously mapped memory object',type='protos']
|
|
--
|
|
|
|
To unmap a memory object once host access to it is no longer needed by the
|
|
application, call:
|
|
|
|
include::../api/protos/vkUnmapMemory.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory.
|
|
* pname:memory is the memory object to be unmapped.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkUnmapMemory-memory-00689]]
|
|
pname:memory must: be currently mapped
|
|
****
|
|
|
|
include::../validity/protos/vkUnmapMemory.txt[]
|
|
--
|
|
|
|
|
|
[[memory-device-lazy_allocation]]
|
|
=== Lazily Allocated Memory
|
|
|
|
If the memory object is allocated from a heap with the
|
|
ename:VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT bit set, that object's backing
|
|
memory may: be provided by the implementation lazily.
|
|
The actual committed size of the memory may: initially be as small as zero
|
|
(or as large as the requested size), and monotonically increases as
|
|
additional memory is needed.
|
|
|
|
A memory type with this flag set is only allowed to be bound to a
|
|
sname:VkImage whose usage flags include
|
|
ename:VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT.
|
|
|
|
[NOTE]
|
|
.Note
|
|
====
|
|
Using lazily allocated memory objects for framebuffer attachments that are
|
|
not needed once a render pass instance has completed may: allow some
|
|
implementations to never allocate memory for such attachments.
|
|
====
|
|
|
|
[open,refpage='vkGetDeviceMemoryCommitment',desc='Query the current commitment for a VkDeviceMemory',type='protos']
|
|
--
|
|
|
|
To determine the amount of lazily-allocated memory that is currently
|
|
committed for a memory object, call:
|
|
|
|
include::../api/protos/vkGetDeviceMemoryCommitment.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory.
|
|
* pname:memory is the memory object being queried.
|
|
* pname:pCommittedMemoryInBytes is a pointer to a basetype:VkDeviceSize
|
|
value in which the number of bytes currently committed is returned, on
|
|
success.
|
|
|
|
The implementation may: update the commitment at any time, and the value
|
|
returned by this query may: be out of date.
|
|
|
|
The implementation guarantees to allocate any committed memory from the
|
|
heapIndex indicated by the memory type that the memory object was created
|
|
with.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkGetDeviceMemoryCommitment-memory-00690]]
|
|
pname:memory must: have been created with a memory type that reports
|
|
ename:VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT
|
|
****
|
|
|
|
include::../validity/protos/vkGetDeviceMemoryCommitment.txt[]
|
|
--
|
|
|
|
ifdef::VK_KHX_device_group[]
|
|
|
|
[[memory-peer-memory-features]]
|
|
=== Peer Memory Features
|
|
|
|
[open,refpage='vkGetDeviceGroupPeerMemoryFeaturesKHX',desc='Query supported peer memory features of a device',type='protos']
|
|
--
|
|
|
|
_Peer memory_ is memory that is allocated for a given physical device and
|
|
then bound to a resource and accessed by a different physical device, in a
|
|
logical device that represents multiple physical devices.
|
|
Some ways of reading and writing peer memory may: not be supported by a
|
|
device.
|
|
|
|
To determine how peer memory can: be accessed, call:
|
|
|
|
include::../api/protos/vkGetDeviceGroupPeerMemoryFeaturesKHX.txt[]
|
|
|
|
* pname:device is the logical device that owns the memory.
|
|
* pname:heapIndex is the index of the memory heap from which the memory is
|
|
allocated.
|
|
* pname:localDeviceIndex is the device index of the physical device that
|
|
performs the memory access.
|
|
* pname:remoteDeviceIndex is the device index of the physical device that
|
|
the memory is allocated for.
|
|
* pname:pPeerMemoryFeatures is a pointer to a bitmask of
|
|
elink:VkPeerMemoryFeatureFlagBitsKHX indicating which types of memory
|
|
accesses are supported for the combination of heap, local, and remote
|
|
devices.
|
|
|
|
.Valid Usage
|
|
****
|
|
* [[VUID-vkGetDeviceGroupPeerMemoryFeaturesKHX-heapIndex-00691]]
|
|
pname:heapIndex must: be less than pname:memoryHeapCount
|
|
* [[VUID-vkGetDeviceGroupPeerMemoryFeaturesKHX-localDeviceIndex-00692]]
|
|
pname:localDeviceIndex must: be a valid device index
|
|
* [[VUID-vkGetDeviceGroupPeerMemoryFeaturesKHX-remoteDeviceIndex-00693]]
|
|
pname:remoteDeviceIndex must: be a valid device index
|
|
* [[VUID-vkGetDeviceGroupPeerMemoryFeaturesKHX-localDeviceIndex-00694]]
|
|
pname:localDeviceIndex must: not equal remoteDeviceIndex
|
|
****
|
|
|
|
include::../validity/protos/vkGetDeviceGroupPeerMemoryFeaturesKHX.txt[]
|
|
|
|
--
|
|
|
|
[open,refpage='VkPeerMemoryFeatureFlagBitsKHX',desc='Bitmask specifying supported peer memory features',type='enums']
|
|
--
|
|
|
|
Bits which may: be set in the value returned for
|
|
flink:vkGetDeviceGroupPeerMemoryFeaturesKHX::pname:pPeerMemoryFeatures,
|
|
indicating the supported peer memory features, are:
|
|
|
|
include::../api/enums/VkPeerMemoryFeatureFlagBitsKHX.txt[]
|
|
|
|
* ename:VK_PEER_MEMORY_FEATURE_COPY_SRC_BIT_KHX indicates that the memory
|
|
can: be accessed as the source of a ftext:vkCmdCopyBuffer,
|
|
ftext:vkCmdCopyImage, ftext:vkCmdCopyBufferToImage, or
|
|
ftext:vkCmdCopyImageToBuffer command.
|
|
* ename:VK_PEER_MEMORY_FEATURE_COPY_DST_BIT_KHX indicates that the memory
|
|
can: be accessed as the destination of a ftext:vkCmdCopyBuffer,
|
|
ftext:vkCmdCopyImage, ftext:vkCmdCopyBufferToImage, or
|
|
ftext:vkCmdCopyImageToBuffer command.
|
|
* ename:VK_PEER_MEMORY_FEATURE_GENERIC_SRC_BIT_KHX indicates that the
|
|
memory can: be read as any memory access type.
|
|
* ename:VK_PEER_MEMORY_FEATURE_GENERIC_DST_BIT_KHX indicates that the
|
|
memory can: be written as any memory access type.
|
|
Shader atomics are considered to be writes.
|
|
|
|
ename:VK_PEER_MEMORY_FEATURE_COPY_DST_BIT_KHX must: be supported for all
|
|
host local heaps and for at least one device local heap.
|
|
|
|
If a device does not support a peer memory feature, it is still valid to use
|
|
a resource that includes both local and peer memory bindings with the
|
|
corresponding access type as long as only the local bindings are actually
|
|
accessed.
|
|
For example, an application doing split-frame rendering would use
|
|
framebuffer attachments that include both local and peer memory bindings,
|
|
but would scissor the rendering to only update local memory.
|
|
|
|
--
|
|
|
|
endif::VK_KHX_device_group[]
|