3rdparty: Update D3D12 memory allocator

Updates D3D12 memory allocator to latest master commit.
This commit is contained in:
JordanTheToaster 2023-12-06 10:34:36 +00:00 committed by Connor McLaughlin
parent ec9bc59962
commit 1561e07ddf
4 changed files with 1382 additions and 571 deletions

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@ -1,3 +1,23 @@
# 1.0.0</b> (2019-09-02) # 2.0.1 (2022-04-05)
A maintenance release with some bug fixes and improvements. There are no changes in the library API.
- Fixed an assert failing when detailed JSON dump was made while a custom pool was present with specified string name (#36, thanks @rbertin-aso).
- Fixed image height calculation in JSON dump visualization tool "GpuMemDumpVis.py" (#37, thanks @rbertin-aso).
- Added JSON Schema for JSON dump format - see file "tools\GpuMemDumpVis\GpuMemDump.schema.json".
- Added documentation section "Resource reference counting".
# 2.0.0 (2022-03-25)
So much has changed since the first release that it doesnt make much sense to compare the differences. Here are the most important features that the library now provides:
- Powerful custom pools, which give an opportunity to not only keep certain resources together, reserve some minimum or limit the maximum amount of memory they can take, but also to pass additional allocation parameters unavailable to simple allocations. Among them, probably the most interesting is `POOL_DESC::HeapProperties`, which allows you to specify parameters of a custom memory type, which may be useful on UMA platforms. Committed allocations can now also be created in custom pools.
- The API for statistics and budget has been redesigned - see structures `Statistics`, `Budget`, `DetailedStatistics`, `TotalStatistics`.
- The library exposes its core allocation algorithm via the “virtual allocator” interface. This can be used to allocate pieces of custom memory or whatever you like, even something completely unrelated to graphics.
- The allocation algorithm has been replaced with the new, more efficient TLSF.
- Added support for defragmentation.
- Objects of the library can be used with smart pointers designed for COM objects.
# 1.0.0 (2019-09-02)
First published version. First published version.

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@ -41,7 +41,7 @@ Additional features:
- Statistics: Obtain brief or detailed statistics about the amount of memory used, unused, number of allocated heaps, number of allocations etc. - globally and per memory heap type. Current memory usage and budget as reported by the system can also be queried. - Statistics: Obtain brief or detailed statistics about the amount of memory used, unused, number of allocated heaps, number of allocations etc. - globally and per memory heap type. Current memory usage and budget as reported by the system can also be queried.
- Debug annotations: Associate custom `void* pPrivateData` and debug `LPCWSTR pName` with each allocation. - Debug annotations: Associate custom `void* pPrivateData` and debug `LPCWSTR pName` with each allocation.
- JSON dump: Obtain a string in JSON format with detailed map of internal state, including list of allocations, their string names, and gaps between them. - JSON dump: Obtain a string in JSON format with detailed map of internal state, including list of allocations, their string names, and gaps between them.
- Convert this JSON dump into a picture to visualize your memory using attached Python script. - Convert this JSON dump into a picture to visualize your memory. See [tools/GpuMemDumpVis](tools/GpuMemDumpVis/README.md).
- Virtual allocator - an API that exposes the core allocation algorithm to be used without allocating real GPU memory, to allocate your own stuff, e.g. sub-allocate pieces of one large buffer. - Virtual allocator - an API that exposes the core allocation algorithm to be used without allocating real GPU memory, to allocate your own stuff, e.g. sub-allocate pieces of one large buffer.
# Prerequisites # Prerequisites
@ -104,10 +104,12 @@ For more information see [NOTICES.txt](NOTICES.txt).
# Software using this library # Software using this library
- **[The Forge](https://github.com/ConfettiFX/The-Forge)** - cross-platform rendering framework. Apache License 2.0. - **[The Forge](https://github.com/ConfettiFX/The-Forge)** - cross-platform rendering framework. Apache License 2.0.
- **[Wicked Engine<img src="https://github.com/turanszkij/WickedEngine/blob/master/Content/logo_small.png" width="28px" align="center"/>](https://github.com/turanszkij/WickedEngine)** - 3D engine with modern graphics
[Some other projects on GitHub](https://github.com/search?q=D3D12MemAlloc.h&type=Code) and some game development studios that use DX12 in their games. [Some other projects on GitHub](https://github.com/search?q=D3D12MemAlloc.h&type=Code) and some game development studios that use DX12 in their games.
# See also # See also
- **[Vcpkg](https://github.com/Microsoft/vcpkg)** dependency manager from Microsoft offers a port of this library that is easy to install.
- **[Vulkan Memory Allocator](https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator/)** - equivalent library for Vulkan. License: MIT. - **[Vulkan Memory Allocator](https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator/)** - equivalent library for Vulkan. License: MIT.
- **[TerraFX.Interop.D3D12MemoryAllocator](https://github.com/terrafx/terrafx.interop.d3d12memoryallocator)** - interop bindings for this library for C#, as used by [TerraFX](https://github.com/terrafx/terrafx). License: MIT. - **[TerraFX.Interop.D3D12MemoryAllocator](https://github.com/terrafx/terrafx.interop.d3d12memoryallocator)** - interop bindings for this library for C#, as used by [TerraFX](https://github.com/terrafx/terrafx). License: MIT.

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@ -24,9 +24,9 @@
/** \mainpage D3D12 Memory Allocator /** \mainpage D3D12 Memory Allocator
<b>Version 2.0.0-development</b> (2021-07-26) <b>Version 2.1.0-development</b> (2023-07-05)
Copyright (c) 2019-2022 Advanced Micro Devices, Inc. All rights reserved. \n Copyright (c) 2019-2023 Advanced Micro Devices, Inc. All rights reserved. \n
License: MIT License: MIT
Documentation of all members: D3D12MemAlloc.h Documentation of all members: D3D12MemAlloc.h
@ -36,6 +36,7 @@ Documentation of all members: D3D12MemAlloc.h
- \subpage quick_start - \subpage quick_start
- [Project setup](@ref quick_start_project_setup) - [Project setup](@ref quick_start_project_setup)
- [Creating resources](@ref quick_start_creating_resources) - [Creating resources](@ref quick_start_creating_resources)
- [Resource reference counting](@ref quick_start_resource_reference_counting)
- [Mapping memory](@ref quick_start_mapping_memory) - [Mapping memory](@ref quick_start_mapping_memory)
- \subpage custom_pools - \subpage custom_pools
- \subpage defragmentation - \subpage defragmentation
@ -58,9 +59,18 @@ Documentation of all members: D3D12MemAlloc.h
*/ */
// If using this library on a platform different than Windows PC or want to use different version of DXGI, // If using this library on a platform different than Windows PC or want to use different version of DXGI,
// you should include D3D12-compatible headers before this library on your own and define this macro. // you should include D3D12-compatible headers before this library on your own and define
// D3D12MA_D3D12_HEADERS_ALREADY_INCLUDED.
// Alternatively, if you are targeting the open sourced DirectX headers, defining D3D12MA_USING_DIRECTX_HEADERS
// will include them rather the ones provided by the Windows SDK.
#ifndef D3D12MA_D3D12_HEADERS_ALREADY_INCLUDED #ifndef D3D12MA_D3D12_HEADERS_ALREADY_INCLUDED
#if defined(D3D12MA_USING_DIRECTX_HEADERS)
#include <directx/d3d12.h>
#include <dxguids/dxguids.h>
#else
#include <d3d12.h> #include <d3d12.h>
#endif
#include <dxgi1_4.h> #include <dxgi1_4.h>
#endif #endif
@ -132,6 +142,18 @@ If providing your own implementation, you need to implement a subset of std::ato
// Forward declaration if ID3D12ProtectedResourceSession is not defined inside the headers (older SDK, pre ID3D12Device4) // Forward declaration if ID3D12ProtectedResourceSession is not defined inside the headers (older SDK, pre ID3D12Device4)
struct ID3D12ProtectedResourceSession; struct ID3D12ProtectedResourceSession;
// Define this enum even if SDK doesn't provide it, to simplify the API.
#ifndef __ID3D12Device1_INTERFACE_DEFINED__
typedef enum D3D12_RESIDENCY_PRIORITY
{
D3D12_RESIDENCY_PRIORITY_MINIMUM = 0x28000000,
D3D12_RESIDENCY_PRIORITY_LOW = 0x50000000,
D3D12_RESIDENCY_PRIORITY_NORMAL = 0x78000000,
D3D12_RESIDENCY_PRIORITY_HIGH = 0xa0010000,
D3D12_RESIDENCY_PRIORITY_MAXIMUM = 0xc8000000
} D3D12_RESIDENCY_PRIORITY;
#endif
namespace D3D12MA namespace D3D12MA
{ {
class D3D12MA_API IUnknownImpl : public IUnknown class D3D12MA_API IUnknownImpl : public IUnknown
@ -144,7 +166,7 @@ public:
protected: protected:
virtual void ReleaseThis() { delete this; } virtual void ReleaseThis() { delete this; }
private: private:
D3D12MA_ATOMIC_UINT32 m_RefCount{1}; D3D12MA_ATOMIC_UINT32 m_RefCount = {1};
}; };
} // namespace D3D12MA } // namespace D3D12MA
@ -226,8 +248,6 @@ enum ALLOCATION_FLAGS
/** Create allocation only if additional memory required for it, if any, won't exceed /** Create allocation only if additional memory required for it, if any, won't exceed
memory budget. Otherwise return `E_OUTOFMEMORY`. memory budget. Otherwise return `E_OUTOFMEMORY`.
\warning Currently this feature is not fully implemented yet.
*/ */
ALLOCATION_FLAG_WITHIN_BUDGET = 0x4, ALLOCATION_FLAG_WITHIN_BUDGET = 0x4,
@ -237,7 +257,6 @@ enum ALLOCATION_FLAGS
*/ */
ALLOCATION_FLAG_UPPER_ADDRESS = 0x8, ALLOCATION_FLAG_UPPER_ADDRESS = 0x8,
/** Set this flag if the allocated memory will have aliasing resources. /** Set this flag if the allocated memory will have aliasing resources.
Use this when calling D3D12MA::Allocator::CreateResource() and similar to Use this when calling D3D12MA::Allocator::CreateResource() and similar to
@ -306,7 +325,6 @@ struct ALLOCATION_DESC
/** \brief Custom pool to place the new resource in. Optional. /** \brief Custom pool to place the new resource in. Optional.
When not NULL, the resource will be created inside specified custom pool. When not NULL, the resource will be created inside specified custom pool.
It will then never be created as committed.
*/ */
Pool* CustomPool; Pool* CustomPool;
/// Custom general-purpose pointer that will be stored in D3D12MA::Allocation. /// Custom general-purpose pointer that will be stored in D3D12MA::Allocation.
@ -570,7 +588,6 @@ private:
UINT64 m_Size; UINT64 m_Size;
UINT64 m_Alignment; UINT64 m_Alignment;
ID3D12Resource* m_Resource; ID3D12Resource* m_Resource;
UINT m_CreationFrameIndex;
void* m_pPrivateData; void* m_pPrivateData;
wchar_t* m_Name; wchar_t* m_Name;
@ -637,7 +654,7 @@ private:
AllocHandle GetAllocHandle() const; AllocHandle GetAllocHandle() const;
NormalBlock* GetBlock(); NormalBlock* GetBlock();
template<typename D3D12_RESOURCE_DESC_T> template<typename D3D12_RESOURCE_DESC_T>
void SetResource(ID3D12Resource* resource, const D3D12_RESOURCE_DESC_T* pResourceDesc); void SetResourcePointer(ID3D12Resource* resource, const D3D12_RESOURCE_DESC_T* pResourceDesc);
void FreeName(); void FreeName();
D3D12MA_CLASS_NO_COPY(Allocation) D3D12MA_CLASS_NO_COPY(Allocation)
@ -838,6 +855,14 @@ enum POOL_FLAGS
*/ */
POOL_FLAG_ALGORITHM_LINEAR = 0x1, POOL_FLAG_ALGORITHM_LINEAR = 0x1,
/** \brief Optimization, allocate MSAA textures as committed resources always.
Specify this flag to create MSAA textures with implicit heaps, as if they were created
with flag D3D12MA::ALLOCATION_FLAG_COMMITTED. Usage of this flags enables pool to create its heaps
on smaller alignment not suitable for MSAA textures.
*/
POOL_FLAG_MSAA_TEXTURES_ALWAYS_COMMITTED = 0x2,
// Bit mask to extract only `ALGORITHM` bits from entire set of flags. // Bit mask to extract only `ALGORITHM` bits from entire set of flags.
POOL_FLAG_ALGORITHM_MASK = POOL_FLAG_ALGORITHM_LINEAR POOL_FLAG_ALGORITHM_MASK = POOL_FLAG_ALGORITHM_LINEAR
}; };
@ -895,6 +920,29 @@ struct POOL_DESC
Valid only if ID3D12Device4 interface is present in current Windows SDK! Valid only if ID3D12Device4 interface is present in current Windows SDK!
*/ */
ID3D12ProtectedResourceSession* pProtectedSession; ID3D12ProtectedResourceSession* pProtectedSession;
/** \brief Residency priority to be set for all allocations made in this pool. Optional.
Set this parameter to one of the possible enum values e.g. `D3D12_RESIDENCY_PRIORITY_HIGH`
to apply specific residency priority to all allocations made in this pool:
`ID3D12Heap` memory blocks used to sub-allocate for placed resources, as well as
committed resources or heaps created when D3D12MA::ALLOCATION_FLAG_COMMITTED is used.
This can increase/decrease chance that the memory will be pushed out from VRAM
to system RAM when the system runs out of memory, which is invisible to the developer
using D3D12 API while it can degrade performance.
Priority is set using function `ID3D12Device1::SetResidencyPriority`.
It is performed only when `ID3D12Device1` interface is defined and successfully obtained.
Otherwise, this parameter is ignored.
This parameter is optional. If you set it to `D3D12_RESIDENCY_PRIORITY(0)`,
residency priority will not be set for allocations made in this pool.
There is no equivalent parameter for allocations made in default pools.
If you want to set residency priority for such allocation, you need to do it manually:
allocate with D3D12MA::ALLOCATION_FLAG_COMMITTED and call
`ID3D12Device1::SetResidencyPriority`, passing `allocation->GetResource()`.
*/
D3D12_RESIDENCY_PRIORITY ResidencyPriority;
}; };
/** \brief Custom memory pool /** \brief Custom memory pool
@ -1009,6 +1057,14 @@ enum ALLOCATOR_FLAGS
Only avaiable if `ID3D12Device8` is present. Otherwise, the flag is ignored. Only avaiable if `ID3D12Device8` is present. Otherwise, the flag is ignored.
*/ */
ALLOCATOR_FLAG_DEFAULT_POOLS_NOT_ZEROED = 0x4, ALLOCATOR_FLAG_DEFAULT_POOLS_NOT_ZEROED = 0x4,
/** \brief Optimization, allocate MSAA textures as committed resources always.
Specify this flag to create MSAA textures with implicit heaps, as if they were created
with flag D3D12MA::ALLOCATION_FLAG_COMMITTED. Usage of this flags enables all default pools
to create its heaps on smaller alignment not suitable for MSAA textures.
*/
ALLOCATOR_FLAG_MSAA_TEXTURES_ALWAYS_COMMITTED = 0x8,
}; };
/// \brief Parameters of created Allocator object. To be used with CreateAllocator(). /// \brief Parameters of created Allocator object. To be used with CreateAllocator().
@ -1144,7 +1200,26 @@ public:
Allocation** ppAllocation, Allocation** ppAllocation,
REFIID riidResource, REFIID riidResource,
void** ppvResource); void** ppvResource);
#endif // #ifdef __ID3D12Device4_INTERFACE_DEFINED__ #endif // #ifdef __ID3D12Device8_INTERFACE_DEFINED__
#ifdef __ID3D12Device10_INTERFACE_DEFINED__
/** \brief Similar to Allocator::CreateResource2, but there are initial layout instead of state and
castable formats list
It internally uses `ID3D12Device10::CreateCommittedResource3` or `ID3D12Device10::CreatePlacedResource2`.
To work correctly, `ID3D12Device10` interface must be available in the current system. Otherwise, `E_NOINTERFACE` is returned.
*/
HRESULT CreateResource3(const ALLOCATION_DESC* pAllocDesc,
const D3D12_RESOURCE_DESC1* pResourceDesc,
D3D12_BARRIER_LAYOUT InitialLayout,
const D3D12_CLEAR_VALUE* pOptimizedClearValue,
UINT32 NumCastableFormats,
DXGI_FORMAT* pCastableFormats,
Allocation** ppAllocation,
REFIID riidResource,
void** ppvResource);
#endif // #ifdef __ID3D12Device10_INTERFACE_DEFINED__
/** \brief Allocates memory without creating any resource placed in it. /** \brief Allocates memory without creating any resource placed in it.
@ -1201,6 +1276,41 @@ public:
REFIID riidResource, REFIID riidResource,
void** ppvResource); void** ppvResource);
#ifdef __ID3D12Device8_INTERFACE_DEFINED__
/** \brief Similar to Allocator::CreateAliasingResource, but supports new structure `D3D12_RESOURCE_DESC1`.
It internally uses `ID3D12Device8::CreatePlacedResource1`.
To work correctly, `ID3D12Device8` interface must be available in the current system. Otherwise, `E_NOINTERFACE` is returned.
*/
HRESULT CreateAliasingResource1(Allocation* pAllocation,
UINT64 AllocationLocalOffset,
const D3D12_RESOURCE_DESC1* pResourceDesc,
D3D12_RESOURCE_STATES InitialResourceState,
const D3D12_CLEAR_VALUE* pOptimizedClearValue,
REFIID riidResource,
void** ppvResource);
#endif // #ifdef __ID3D12Device8_INTERFACE_DEFINED__
#ifdef __ID3D12Device10_INTERFACE_DEFINED__
/** \brief Similar to Allocator::CreateAliasingResource1, but there are initial layout instead of state and
castable formats list
It internally uses `ID3D12Device10::CreatePlacedResource2`.
To work correctly, `ID3D12Device10` interface must be available in the current system. Otherwise, `E_NOINTERFACE` is returned.
*/
HRESULT CreateAliasingResource2(Allocation* pAllocation,
UINT64 AllocationLocalOffset,
const D3D12_RESOURCE_DESC1* pResourceDesc,
D3D12_BARRIER_LAYOUT InitialLayout,
const D3D12_CLEAR_VALUE* pOptimizedClearValue,
UINT32 NumCastableFormats,
DXGI_FORMAT* pCastableFormats,
REFIID riidResource,
void** ppvResource);
#endif // #ifdef __ID3D12Device10_INTERFACE_DEFINED__
/** \brief Creates custom pool. /** \brief Creates custom pool.
*/ */
HRESULT CreatePool( HRESULT CreatePool(
@ -1246,8 +1356,9 @@ public:
*/ */
void CalculateStatistics(TotalStatistics* pStats); void CalculateStatistics(TotalStatistics* pStats);
/// Builds and returns statistics as a string in JSON format. /** \brief Builds and returns statistics as a string in JSON format.
/** @param[out] ppStatsString Must be freed using Allocator::FreeStatsString. *
@param[out] ppStatsString Must be freed using Allocator::FreeStatsString.
@param DetailedMap `TRUE` to include full list of allocations (can make the string quite long), `FALSE` to only return statistics. @param DetailedMap `TRUE` to include full list of allocations (can make the string quite long), `FALSE` to only return statistics.
*/ */
void BuildStatsString(WCHAR** ppStatsString, BOOL DetailedMap) const; void BuildStatsString(WCHAR** ppStatsString, BOOL DetailedMap) const;
@ -1559,9 +1670,9 @@ to be passed along with `D3D12_RESOURCE_DESC` and other parameters for created
resource. This structure describes parameters of the desired memory allocation, resource. This structure describes parameters of the desired memory allocation,
including choice of `D3D12_HEAP_TYPE`. including choice of `D3D12_HEAP_TYPE`.
The function also returns a new object of type D3D12MA::Allocation, created along The function returns a new object of type D3D12MA::Allocation.
with usual `ID3D12Resource`. It represents allocated memory and can be queried It represents allocated memory and can be queried for size, offset, `ID3D12Heap`.
for size, offset, `ID3D12Resource`, and `ID3D12Heap` if needed. It also holds a reference to the `ID3D12Resource`, which can be accessed by calling D3D12MA::Allocation::GetResource().
\code \code
D3D12_RESOURCE_DESC resourceDesc = {}; D3D12_RESOURCE_DESC resourceDesc = {};
@ -1580,7 +1691,6 @@ resourceDesc.Flags = D3D12_RESOURCE_FLAG_NONE;
D3D12MA::ALLOCATION_DESC allocationDesc = {}; D3D12MA::ALLOCATION_DESC allocationDesc = {};
allocationDesc.HeapType = D3D12_HEAP_TYPE_DEFAULT; allocationDesc.HeapType = D3D12_HEAP_TYPE_DEFAULT;
D3D12Resource* resource;
D3D12MA::Allocation* allocation; D3D12MA::Allocation* allocation;
HRESULT hr = allocator->CreateResource( HRESULT hr = allocator->CreateResource(
&allocationDesc, &allocationDesc,
@ -1588,15 +1698,16 @@ HRESULT hr = allocator->CreateResource(
D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_COPY_DEST,
NULL, NULL,
&allocation, &allocation,
IID_PPV_ARGS(&resource)); IID_NULL, NULL);
// Use allocation->GetResource()...
\endcode \endcode
You need to remember both resource and allocation objects and destroy them You need to release the allocation object when no longer needed.
separately when no longer needed. This will also release the D3D12 resource.
\code \code
allocation->Release(); allocation->Release();
resource->Release();
\endcode \endcode
The advantage of using the allocator instead of creating committed resource, and The advantage of using the allocator instead of creating committed resource, and
@ -1619,6 +1730,65 @@ they can be kept together. By using this library, you don't need to handle this
manually. manually.
\section quick_start_resource_reference_counting Resource reference counting
`ID3D12Resource` and other interfaces of Direct3D 12 use COM, so they are reference-counted.
Objects of this library are reference-counted as well.
An object of type D3D12MA::Allocation remembers the resource (buffer or texture)
that was created together with this memory allocation
and holds a reference to the `ID3D12Resource` object.
(Note this is a difference to Vulkan Memory Allocator, where a `VmaAllocation` object has no connection
with the buffer or image that was created with it.)
Thus, it is important to manage the resource reference counter properly.
<b>The simplest use case</b> is shown in the code snippet above.
When only D3D12MA::Allocation object is obtained from a function call like D3D12MA::Allocator::CreateResource,
it remembers the `ID3D12Resource` that was created with it and holds a reference to it.
The resource can be obtained by calling `allocation->GetResource()`, which doesn't increment the resource
reference counter.
Calling `allocation->Release()` will decrease the resource reference counter, which is = 1 in this case,
so the resource will be released.
<b>Second option</b> is to retrieve a pointer to the resource along with D3D12MA::Allocation.
Last parameters of the resource creation function can be used for this purpose.
\code
D3D12MA::Allocation* allocation;
ID3D12Resource* resource;
HRESULT hr = allocator->CreateResource(
&allocationDesc,
&resourceDesc,
D3D12_RESOURCE_STATE_COPY_DEST,
NULL,
&allocation,
IID_PPV_ARGS(&resource));
// Use resource...
\endcode
In this case, returned pointer `resource` is equal to `allocation->GetResource()`,
but the creation function additionally increases resource reference counter for the purpose of returning it from this call
(it actually calls `QueryInterface` internally), so the resource will have the counter = 2.
The resource then need to be released along with the allocation, in this particular order,
to make sure the resource is destroyed before its memory heap can potentially be freed.
\code
resource->Release();
allocation->Release();
\endcode
<b>More advanced use cases</b> are possible when we consider that an D3D12MA::Allocation object can just hold
a reference to any resource.
It can be changed by calling D3D12MA::Allocation::SetResource. This function
releases the old resource and calls `AddRef` on the new one.
Special care must be taken when performing <b>defragmentation</b>.
The new resource created at the destination place should be set as `pass.pMoves[i].pDstTmpAllocation->SetResource(newRes)`,
but it is moved to the source allocation at end of the defragmentation pass,
while the old resource accessible through `pass.pMoves[i].pSrcAllocation->GetResource()` is then released.
For more information, see documentation chapter \ref defragmentation.
\section quick_start_mapping_memory Mapping memory \section quick_start_mapping_memory Mapping memory
The process of getting regular CPU-side pointer to the memory of a resource in The process of getting regular CPU-side pointer to the memory of a resource in
@ -1892,9 +2062,20 @@ You can perform the defragmentation incrementally to limit the number of allocat
in each pass, e.g. to call it in sync with render frames and not to experience too big hitches. in each pass, e.g. to call it in sync with render frames and not to experience too big hitches.
See members: D3D12MA::DEFRAGMENTATION_DESC::MaxBytesPerPass, D3D12MA::DEFRAGMENTATION_DESC::MaxAllocationsPerPass. See members: D3D12MA::DEFRAGMENTATION_DESC::MaxBytesPerPass, D3D12MA::DEFRAGMENTATION_DESC::MaxAllocationsPerPass.
It is also safe to perform the defragmentation asynchronously to render frames and other Direct3D 12 and %D3D12MA <b>Thread safety:</b>
It is safe to perform the defragmentation asynchronously to render frames and other Direct3D 12 and %D3D12MA
usage, possibly from multiple threads, with the exception that allocations usage, possibly from multiple threads, with the exception that allocations
returned in D3D12MA::DEFRAGMENTATION_PASS_MOVE_INFO::pMoves shouldn't be released until the defragmentation pass is ended. returned in D3D12MA::DEFRAGMENTATION_PASS_MOVE_INFO::pMoves shouldn't be released until the defragmentation pass is ended.
During the call to D3D12MA::DefragmentationContext::BeginPass(), any operations on the memory pool
affected by the defragmentation are blocked by a mutex.
What it means in practice is that you shouldn't free any allocations from the defragmented pool
since the moment a call to `BeginPass` begins. Otherwise, a thread performing the `allocation->Release()`
would block for the time `BeginPass` executes and then free the allocation when it finishes, while the allocation
could have ended up on the list of allocations to move.
A solution to freeing allocations during defragmentation is to find such allocation on the list
`pass.pMoves[i]` and set its operation to D3D12MA::DEFRAGMENTATION_MOVE_OPERATION_DESTROY instead of
calling `allocation->Release()`, or simply deferring the release to the time after defragmentation finished.
<b>Mapping</b> is out of scope of this library and so it is not preserved after an allocation is moved during defragmentation. <b>Mapping</b> is out of scope of this library and so it is not preserved after an allocation is moved during defragmentation.
You need to map the new resource yourself if needed. You need to map the new resource yourself if needed.

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