API elements related to the allocation, deallocation, and management of Vulkan memory, buffers, images. Most basic ones being: vmaCreateBuffer(), vmaCreateImage(). More...

Classes
struct	VmaAllocationCreateInfo

struct	VmaPoolCreateInfo
	Describes parameter of created VmaPool. More...

struct	VmaAllocationInfo
	Parameters of VmaAllocation objects, that can be retrieved using function vmaGetAllocationInfo(). More...

struct	VmaDefragmentationInfo2
	Parameters for defragmentation. More...

struct	VmaDefragmentationPassMoveInfo

struct	VmaDefragmentationPassInfo
	Parameters for incremental defragmentation steps. More...

struct	VmaDefragmentationInfo
	Deprecated. Optional configuration parameters to be passed to function vmaDefragment(). More...

struct	VmaDefragmentationStats
	Statistics returned by function vmaDefragment(). More...

struct	VmaPool
	Represents custom memory pool. More...

struct	VmaAllocation
	Represents single memory allocation. More...

struct	VmaDefragmentationContext
	Represents Opaque object that represents started defragmentation process. More...

Typedefs
typedef enum VmaMemoryUsage	VmaMemoryUsage
	Intended usage of the allocated memory. More...

typedef enum VmaAllocationCreateFlagBits	VmaAllocationCreateFlagBits
	Flags to be passed as VmaAllocationCreateInfo::flags. More...

typedef VkFlags	VmaAllocationCreateFlags

typedef enum VmaPoolCreateFlagBits	VmaPoolCreateFlagBits
	Flags to be passed as VmaPoolCreateInfo::flags. More...

typedef VkFlags	VmaPoolCreateFlags
	Flags to be passed as VmaPoolCreateInfo::flags. See VmaPoolCreateFlagBits. More...

typedef enum VmaDefragmentationFlagBits	VmaDefragmentationFlagBits
	Flags to be used in vmaDefragmentationBegin(). None at the moment. Reserved for future use. More...

typedef VkFlags	VmaDefragmentationFlags

typedef struct VmaAllocationCreateInfo	VmaAllocationCreateInfo

typedef struct VmaPoolCreateInfo	VmaPoolCreateInfo
	Describes parameter of created VmaPool. More...

typedef struct VmaAllocationInfo	VmaAllocationInfo
	Parameters of VmaAllocation objects, that can be retrieved using function vmaGetAllocationInfo(). More...

typedef struct VmaDefragmentationInfo2	VmaDefragmentationInfo2
	Parameters for defragmentation. More...

typedef struct VmaDefragmentationPassMoveInfo	VmaDefragmentationPassMoveInfo

typedef struct VmaDefragmentationPassInfo	VmaDefragmentationPassInfo
	Parameters for incremental defragmentation steps. More...

typedef struct VmaDefragmentationInfo	VmaDefragmentationInfo
	Deprecated. Optional configuration parameters to be passed to function vmaDefragment(). More...

typedef struct VmaDefragmentationStats	VmaDefragmentationStats
	Statistics returned by function vmaDefragment(). More...

Enumerations
enum	VmaMemoryUsage { VMA_MEMORY_USAGE_UNKNOWN = 0 , VMA_MEMORY_USAGE_GPU_ONLY = 1 , VMA_MEMORY_USAGE_CPU_ONLY = 2 , VMA_MEMORY_USAGE_CPU_TO_GPU = 3 , VMA_MEMORY_USAGE_GPU_TO_CPU = 4 , VMA_MEMORY_USAGE_CPU_COPY = 5 , VMA_MEMORY_USAGE_GPU_LAZILY_ALLOCATED = 6 , VMA_MEMORY_USAGE_MAX_ENUM = 0x7FFFFFFF }
	Intended usage of the allocated memory. More...

enum	VmaAllocationCreateFlagBits { VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT = 0x00000001 , VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT = 0x00000002 , VMA_ALLOCATION_CREATE_MAPPED_BIT = 0x00000004 , VMA_ALLOCATION_CREATE_RESERVED_1_BIT = 0x00000008 , VMA_ALLOCATION_CREATE_RESERVED_2_BIT = 0x00000010 , VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT = 0x00000020 , VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT = 0x00000040 , VMA_ALLOCATION_CREATE_DONT_BIND_BIT = 0x00000080 , VMA_ALLOCATION_CREATE_WITHIN_BUDGET_BIT = 0x00000100 , VMA_ALLOCATION_CREATE_CAN_ALIAS_BIT = 0x00000200 , VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT = 0x00010000 , VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT = 0x00020000 , VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT = 0x00040000 , VMA_ALLOCATION_CREATE_STRATEGY_MIN_MEMORY_BIT = VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT , VMA_ALLOCATION_CREATE_STRATEGY_MIN_TIME_BIT = VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT , VMA_ALLOCATION_CREATE_STRATEGY_MIN_FRAGMENTATION_BIT = VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT , VMA_ALLOCATION_CREATE_STRATEGY_MASK , VMA_ALLOCATION_CREATE_FLAG_BITS_MAX_ENUM = 0x7FFFFFFF }
	Flags to be passed as VmaAllocationCreateInfo::flags. More...

enum	VmaPoolCreateFlagBits { VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT = 0x00000002 , VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT = 0x00000004 , VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT = 0x00000008 , VMA_POOL_CREATE_TLSF_ALGORITHM_BIT = 0x00000010 , VMA_POOL_CREATE_ALGORITHM_MASK , VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM = 0x7FFFFFFF }
	Flags to be passed as VmaPoolCreateInfo::flags. More...

enum	VmaDefragmentationFlagBits { VMA_DEFRAGMENTATION_FLAG_INCREMENTAL = 0x1 , VMA_DEFRAGMENTATION_FLAG_BITS_MAX_ENUM = 0x7FFFFFFF }
	Flags to be used in vmaDefragmentationBegin(). None at the moment. Reserved for future use. More...

Functions
VkResult	vmaFindMemoryTypeIndex (VmaAllocator allocator, uint32_t memoryTypeBits, const VmaAllocationCreateInfo pAllocationCreateInfo, uint32_t pMemoryTypeIndex)
	Helps to find memoryTypeIndex, given memoryTypeBits and VmaAllocationCreateInfo. More...

VkResult	vmaFindMemoryTypeIndexForBufferInfo (VmaAllocator allocator, const VkBufferCreateInfo pBufferCreateInfo, const VmaAllocationCreateInfo pAllocationCreateInfo, uint32_t *pMemoryTypeIndex)
	Helps to find memoryTypeIndex, given VkBufferCreateInfo and VmaAllocationCreateInfo. More...

VkResult	vmaFindMemoryTypeIndexForImageInfo (VmaAllocator allocator, const VkImageCreateInfo pImageCreateInfo, const VmaAllocationCreateInfo pAllocationCreateInfo, uint32_t *pMemoryTypeIndex)
	Helps to find memoryTypeIndex, given VkImageCreateInfo and VmaAllocationCreateInfo. More...

VkResult	vmaCreatePool (VmaAllocator allocator, const VmaPoolCreateInfo pCreateInfo, VmaPool pPool)
	Allocates Vulkan device memory and creates VmaPool object. More...

void	vmaDestroyPool (VmaAllocator allocator, VmaPool pool)
	Destroys VmaPool object and frees Vulkan device memory. More...

VkResult	vmaCheckPoolCorruption (VmaAllocator allocator, VmaPool pool)
	Checks magic number in margins around all allocations in given memory pool in search for corruptions. More...

void	vmaGetPoolName (VmaAllocator allocator, VmaPool pool, const char **ppName)
	Retrieves name of a custom pool. More...

void	vmaSetPoolName (VmaAllocator allocator, VmaPool pool, const char *pName)
	Sets name of a custom pool. More...

VkResult	vmaAllocateMemory (VmaAllocator allocator, const VkMemoryRequirements pVkMemoryRequirements, const VmaAllocationCreateInfo pCreateInfo, VmaAllocation pAllocation, VmaAllocationInfo pAllocationInfo)
	General purpose memory allocation. More...

VkResult	vmaAllocateMemoryPages (VmaAllocator allocator, const VkMemoryRequirements pVkMemoryRequirements, const VmaAllocationCreateInfo pCreateInfo, size_t allocationCount, VmaAllocation pAllocations, VmaAllocationInfo pAllocationInfo)
	General purpose memory allocation for multiple allocation objects at once. More...

VkResult	vmaAllocateMemoryForBuffer (VmaAllocator allocator, VkBuffer buffer, const VmaAllocationCreateInfo pCreateInfo, VmaAllocation pAllocation, VmaAllocationInfo *pAllocationInfo)

VkResult	vmaAllocateMemoryForImage (VmaAllocator allocator, VkImage image, const VmaAllocationCreateInfo pCreateInfo, VmaAllocation pAllocation, VmaAllocationInfo *pAllocationInfo)
	Function similar to vmaAllocateMemoryForBuffer(). More...

void	vmaFreeMemory (VmaAllocator allocator, const VmaAllocation allocation)
	Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(), or vmaAllocateMemoryForImage(). More...

void	vmaFreeMemoryPages (VmaAllocator allocator, size_t allocationCount, const VmaAllocation *pAllocations)
	Frees memory and destroys multiple allocations. More...

void	vmaGetAllocationInfo (VmaAllocator allocator, VmaAllocation allocation, VmaAllocationInfo *pAllocationInfo)
	Returns current information about specified allocation. More...

void	vmaSetAllocationUserData (VmaAllocator allocator, VmaAllocation allocation, void *pUserData)
	Sets pUserData in given allocation to new value. More...

void	vmaGetAllocationMemoryProperties (VmaAllocator allocator, VmaAllocation allocation, VkMemoryPropertyFlags *pFlags)
	Given an allocation, returns Property Flags of its memory type. More...

VkResult	vmaMapMemory (VmaAllocator allocator, VmaAllocation allocation, void **ppData)
	Maps memory represented by given allocation and returns pointer to it. More...

void	vmaUnmapMemory (VmaAllocator allocator, VmaAllocation allocation)
	Unmaps memory represented by given allocation, mapped previously using vmaMapMemory(). More...

VkResult	vmaFlushAllocation (VmaAllocator allocator, VmaAllocation allocation, VkDeviceSize offset, VkDeviceSize size)
	Flushes memory of given allocation. More...

VkResult	vmaInvalidateAllocation (VmaAllocator allocator, VmaAllocation allocation, VkDeviceSize offset, VkDeviceSize size)
	Invalidates memory of given allocation. More...

VkResult	vmaFlushAllocations (VmaAllocator allocator, uint32_t allocationCount, const VmaAllocation allocations, const VkDeviceSize offsets, const VkDeviceSize *sizes)
	Flushes memory of given set of allocations. More...

VkResult	vmaInvalidateAllocations (VmaAllocator allocator, uint32_t allocationCount, const VmaAllocation allocations, const VkDeviceSize offsets, const VkDeviceSize *sizes)
	Invalidates memory of given set of allocations. More...

VkResult	vmaCheckCorruption (VmaAllocator allocator, uint32_t memoryTypeBits)
	Checks magic number in margins around all allocations in given memory types (in both default and custom pools) in search for corruptions. More...

VkResult	vmaDefragmentationBegin (VmaAllocator allocator, const VmaDefragmentationInfo2 pInfo, VmaDefragmentationStats pStats, VmaDefragmentationContext *pContext)
	Begins defragmentation process. More...

VkResult	vmaDefragmentationEnd (VmaAllocator allocator, VmaDefragmentationContext context)
	Ends defragmentation process. More...

VkResult	vmaBeginDefragmentationPass (VmaAllocator allocator, VmaDefragmentationContext context, VmaDefragmentationPassInfo *pInfo)

VkResult	vmaEndDefragmentationPass (VmaAllocator allocator, VmaDefragmentationContext context)

VkResult	vmaDefragment (VmaAllocator allocator, const VmaAllocation pAllocations, size_t allocationCount, VkBool32 pAllocationsChanged, const VmaDefragmentationInfo pDefragmentationInfo, VmaDefragmentationStats pDefragmentationStats)
	Deprecated. Compacts memory by moving allocations. More...

VkResult	vmaBindBufferMemory (VmaAllocator allocator, VmaAllocation allocation, VkBuffer buffer)
	Binds buffer to allocation. More...

VkResult	vmaBindBufferMemory2 (VmaAllocator allocator, VmaAllocation allocation, VkDeviceSize allocationLocalOffset, VkBuffer buffer, const void *pNext)
	Binds buffer to allocation with additional parameters. More...

VkResult	vmaBindImageMemory (VmaAllocator allocator, VmaAllocation allocation, VkImage image)
	Binds image to allocation. More...

VkResult	vmaBindImageMemory2 (VmaAllocator allocator, VmaAllocation allocation, VkDeviceSize allocationLocalOffset, VkImage image, const void *pNext)
	Binds image to allocation with additional parameters. More...

VkResult	vmaCreateBuffer (VmaAllocator allocator, const VkBufferCreateInfo pBufferCreateInfo, const VmaAllocationCreateInfo pAllocationCreateInfo, VkBuffer pBuffer, VmaAllocation pAllocation, VmaAllocationInfo *pAllocationInfo)

VkResult	vmaCreateBufferWithAlignment (VmaAllocator allocator, const VkBufferCreateInfo pBufferCreateInfo, const VmaAllocationCreateInfo pAllocationCreateInfo, VkDeviceSize minAlignment, VkBuffer pBuffer, VmaAllocation pAllocation, VmaAllocationInfo *pAllocationInfo)
	Creates a buffer with additional minimum alignment. More...

void	vmaDestroyBuffer (VmaAllocator allocator, VkBuffer buffer, VmaAllocation allocation)
	Destroys Vulkan buffer and frees allocated memory. More...

VkResult	vmaCreateImage (VmaAllocator allocator, const VkImageCreateInfo pImageCreateInfo, const VmaAllocationCreateInfo pAllocationCreateInfo, VkImage pImage, VmaAllocation pAllocation, VmaAllocationInfo *pAllocationInfo)
	Function similar to vmaCreateBuffer(). More...

void	vmaDestroyImage (VmaAllocator allocator, VkImage image, VmaAllocation allocation)
	Destroys Vulkan image and frees allocated memory. More...

Detailed Description

API elements related to the allocation, deallocation, and management of Vulkan memory, buffers, images. Most basic ones being: vmaCreateBuffer(), vmaCreateImage().

Typedef Documentation

◆ VmaAllocationCreateFlagBits

typedef enum VmaAllocationCreateFlagBits VmaAllocationCreateFlagBits

Flags to be passed as VmaAllocationCreateInfo::flags.

◆ VmaAllocationCreateFlags

typedef VkFlags VmaAllocationCreateFlags

◆ VmaAllocationCreateInfo

typedef struct VmaAllocationCreateInfo VmaAllocationCreateInfo

◆ VmaAllocationInfo

typedef struct VmaAllocationInfo VmaAllocationInfo

Parameters of VmaAllocation objects, that can be retrieved using function vmaGetAllocationInfo().

◆ VmaDefragmentationFlagBits

typedef enum VmaDefragmentationFlagBits VmaDefragmentationFlagBits

Flags to be used in vmaDefragmentationBegin(). None at the moment. Reserved for future use.

◆ VmaDefragmentationFlags

typedef VkFlags VmaDefragmentationFlags

◆ VmaDefragmentationInfo

typedef struct VmaDefragmentationInfo VmaDefragmentationInfo

Deprecated. Optional configuration parameters to be passed to function vmaDefragment().

Deprecated:: This is a part of the old interface. It is recommended to use structure VmaDefragmentationInfo2 and function vmaDefragmentationBegin() instead.

◆ VmaDefragmentationInfo2

typedef struct VmaDefragmentationInfo2 VmaDefragmentationInfo2

Parameters for defragmentation.

To be used with function vmaDefragmentationBegin().

◆ VmaDefragmentationPassInfo

typedef struct VmaDefragmentationPassInfo VmaDefragmentationPassInfo

Parameters for incremental defragmentation steps.

To be used with function vmaBeginDefragmentationPass().

◆ VmaDefragmentationPassMoveInfo

typedef struct VmaDefragmentationPassMoveInfo VmaDefragmentationPassMoveInfo

◆ VmaDefragmentationStats

typedef struct VmaDefragmentationStats VmaDefragmentationStats

Statistics returned by function vmaDefragment().

◆ VmaMemoryUsage

typedef enum VmaMemoryUsage VmaMemoryUsage

Intended usage of the allocated memory.

◆ VmaPoolCreateFlagBits

typedef enum VmaPoolCreateFlagBits VmaPoolCreateFlagBits

Flags to be passed as VmaPoolCreateInfo::flags.

◆ VmaPoolCreateFlags

typedef VkFlags VmaPoolCreateFlags

Flags to be passed as VmaPoolCreateInfo::flags. See VmaPoolCreateFlagBits.

◆ VmaPoolCreateInfo

typedef struct VmaPoolCreateInfo VmaPoolCreateInfo

Describes parameter of created VmaPool.

Enumeration Type Documentation

◆ VmaAllocationCreateFlagBits

enum VmaAllocationCreateFlagBits

Flags to be passed as VmaAllocationCreateInfo::flags.

Enumerator
VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT	Set this flag if the allocation should have its own memory block. Use it for special, big resources, like fullscreen images used as attachments.
VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT	Set this flag to only try to allocate from existing `VkDeviceMemory` blocks and never create new such block. If new allocation cannot be placed in any of the existing blocks, allocation fails with `VK_ERROR_OUT_OF_DEVICE_MEMORY` error. You should not use VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT and VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT at the same time. It makes no sense. If VmaAllocationCreateInfo::pool is not null, this flag is implied and ignored.
VMA_ALLOCATION_CREATE_MAPPED_BIT	Set this flag to use a memory that will be persistently mapped and retrieve pointer to it. Pointer to mapped memory will be returned through VmaAllocationInfo::pMappedData. It is valid to use this flag for allocation made from memory type that is not `HOST_VISIBLE`. This flag is then ignored and memory is not mapped. This is useful if you need an allocation that is efficient to use on GPU (`DEVICE_LOCAL`) and still want to map it directly if possible on platforms that support it (e.g. Intel GPU).
VMA_ALLOCATION_CREATE_RESERVED_1_BIT	Deprecated: Removed. Do not use.
VMA_ALLOCATION_CREATE_RESERVED_2_BIT	Deprecated: Removed. Do not use.
VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT	Set this flag to treat VmaAllocationCreateInfo::pUserData as pointer to a null-terminated string. Instead of copying pointer value, a local copy of the string is made and stored in allocation's `pUserData`. The string is automatically freed together with the allocation. It is also used in vmaBuildStatsString().
VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT	Allocation will be created from upper stack in a double stack pool. This flag is only allowed for custom pools created with VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT flag.
VMA_ALLOCATION_CREATE_DONT_BIND_BIT	Create both buffer/image and allocation, but don't bind them together. It is useful when you want to bind yourself to do some more advanced binding, e.g. using some extensions. The flag is meaningful only with functions that bind by default: vmaCreateBuffer(), vmaCreateImage(). Otherwise it is ignored.
VMA_ALLOCATION_CREATE_WITHIN_BUDGET_BIT	Create allocation only if additional device memory required for it, if any, won't exceed memory budget. Otherwise return `VK_ERROR_OUT_OF_DEVICE_MEMORY`.
VMA_ALLOCATION_CREATE_CAN_ALIAS_BIT	Set this flag if the allocated memory will have aliasing resources. Usage of this flag prevents supplying `VkMemoryDedicatedAllocateInfoKHR` when VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT is specified. Otherwise created dedicated memory will not be suitable for aliasing resources, resulting in Vulkan Validation Layer errors.
VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT	Allocation strategy that chooses smallest possible free range for the allocation.
VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT	Allocation strategy that chooses biggest possible free range for the allocation.
VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT	Allocation strategy that chooses first suitable free range for the allocation. "First" doesn't necessarily means the one with smallest offset in memory, but rather the one that is easiest and fastest to find.
VMA_ALLOCATION_CREATE_STRATEGY_MIN_MEMORY_BIT	Allocation strategy that tries to minimize memory usage.
VMA_ALLOCATION_CREATE_STRATEGY_MIN_TIME_BIT	Allocation strategy that tries to minimize allocation time.
VMA_ALLOCATION_CREATE_STRATEGY_MIN_FRAGMENTATION_BIT	Allocation strategy that tries to minimize memory fragmentation.
VMA_ALLOCATION_CREATE_STRATEGY_MASK	A bit mask to extract only `STRATEGY` bits from entire set of flags.
VMA_ALLOCATION_CREATE_FLAG_BITS_MAX_ENUM

◆ VmaDefragmentationFlagBits

enum VmaDefragmentationFlagBits

Flags to be used in vmaDefragmentationBegin(). None at the moment. Reserved for future use.

Enumerator
VMA_DEFRAGMENTATION_FLAG_INCREMENTAL
VMA_DEFRAGMENTATION_FLAG_BITS_MAX_ENUM

◆ VmaMemoryUsage

enum VmaMemoryUsage

Intended usage of the allocated memory.

Enumerator
VMA_MEMORY_USAGE_UNKNOWN	No intended memory usage specified. Use other members of VmaAllocationCreateInfo to specify your requirements.
VMA_MEMORY_USAGE_GPU_ONLY	Memory will be used on device only, so fast access from the device is preferred. It usually means device-local GPU (video) memory. No need to be mappable on host. It is roughly equivalent of `D3D12_HEAP_TYPE_DEFAULT`. Usage: Resources written and read by device, e.g. images used as attachments. Resources transferred from host once (immutable) or infrequently and read by device multiple times, e.g. textures to be sampled, vertex buffers, uniform (constant) buffers, and majority of other types of resources used on GPU. Allocation may still end up in `HOST_VISIBLE` memory on some implementations. In such case, you are free to map it. You can use VMA_ALLOCATION_CREATE_MAPPED_BIT with this usage type.
VMA_MEMORY_USAGE_CPU_ONLY	Memory will be mappable on host. It usually means CPU (system) memory. Guarantees to be `HOST_VISIBLE` and `HOST_COHERENT`. CPU access is typically uncached. Writes may be write-combined. Resources created in this pool may still be accessible to the device, but access to them can be slow. It is roughly equivalent of `D3D12_HEAP_TYPE_UPLOAD`. Usage: Staging copy of resources used as transfer source.
VMA_MEMORY_USAGE_CPU_TO_GPU	Memory that is both mappable on host (guarantees to be `HOST_VISIBLE`) and preferably fast to access by GPU. CPU access is typically uncached. Writes may be write-combined. Usage: Resources written frequently by host (dynamic), read by device. E.g. textures (with LINEAR layout), vertex buffers, uniform buffers updated every frame or every draw call.
VMA_MEMORY_USAGE_GPU_TO_CPU	Memory mappable on host (guarantees to be `HOST_VISIBLE`) and cached. It is roughly equivalent of `D3D12_HEAP_TYPE_READBACK`. Usage: Resources written by device, read by host - results of some computations, e.g. screen capture, average scene luminance for HDR tone mapping. Any resources read or accessed randomly on host, e.g. CPU-side copy of vertex buffer used as source of transfer, but also used for collision detection.
VMA_MEMORY_USAGE_CPU_COPY	CPU memory - memory that is preferably not `DEVICE_LOCAL`, but also not guaranteed to be `HOST_VISIBLE`. Usage: Staging copy of resources moved from GPU memory to CPU memory as part of custom paging/residency mechanism, to be moved back to GPU memory when needed.
VMA_MEMORY_USAGE_GPU_LAZILY_ALLOCATED	Lazily allocated GPU memory having `VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT`. Exists mostly on mobile platforms. Using it on desktop PC or other GPUs with no such memory type present will fail the allocation. Usage: Memory for transient attachment images (color attachments, depth attachments etc.), created with `VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT`. Allocations with this usage are always created as dedicated - it implies VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT.
VMA_MEMORY_USAGE_MAX_ENUM

◆ VmaPoolCreateFlagBits

enum VmaPoolCreateFlagBits

Flags to be passed as VmaPoolCreateInfo::flags.

Enumerator
VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT	Use this flag if you always allocate only buffers and linear images or only optimal images out of this pool and so Buffer-Image Granularity can be ignored. This is an optional optimization flag. If you always allocate using vmaCreateBuffer(), vmaCreateImage(), vmaAllocateMemoryForBuffer(), then you don't need to use it because allocator knows exact type of your allocations so it can handle Buffer-Image Granularity in the optimal way. If you also allocate using vmaAllocateMemoryForImage() or vmaAllocateMemory(), exact type of such allocations is not known, so allocator must be conservative in handling Buffer-Image Granularity, which can lead to suboptimal allocation (wasted memory). In that case, if you can make sure you always allocate only buffers and linear images or only optimal images out of this pool, use this flag to make allocator disregard Buffer-Image Granularity and so make allocations faster and more optimal.
VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT	Enables alternative, linear allocation algorithm in this pool. Specify this flag to enable linear allocation algorithm, which always creates new allocations after last one and doesn't reuse space from allocations freed in between. It trades memory consumption for simplified algorithm and data structure, which has better performance and uses less memory for metadata. By using this flag, you can achieve behavior of free-at-once, stack, ring buffer, and double stack. For details, see documentation chapter Linear allocation algorithm. When using this flag, you must specify VmaPoolCreateInfo::maxBlockCount == 1 (or 0 for default).
VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT	Enables alternative, buddy allocation algorithm in this pool. It operates on a tree of blocks, each having size that is a power of two and a half of its parent's size. Comparing to default algorithm, this one provides faster allocation and deallocation and decreased external fragmentation, at the expense of more memory wasted (internal fragmentation). For details, see documentation chapter Buddy allocation algorithm.
VMA_POOL_CREATE_TLSF_ALGORITHM_BIT	Enables alternative, Two-Level Segregated Fit (TLSF) allocation algorithm in this pool. This algorithm is based on 2-level lists dividing address space into smaller chunks. The first level is aligned to power of two which serves as buckets for requested memory to fall into, and the second level is lineary subdivided into lists of free memory. This algorithm aims to achieve bounded response time even in the worst case scenario. Allocation time can be sometimes slightly longer than compared to other algorithms but in return the application can avoid stalls in case of fragmentation, giving predictable results, suitable for real-time use cases.
VMA_POOL_CREATE_ALGORITHM_MASK	Bit mask to extract only `ALGORITHM` bits from entire set of flags.
VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM

Function Documentation

◆ vmaAllocateMemory()

VkResult vmaAllocateMemory	(	VmaAllocator	allocator,
		const VkMemoryRequirements *	pVkMemoryRequirements,
		const VmaAllocationCreateInfo *	pCreateInfo,
		VmaAllocation *	pAllocation,
		VmaAllocationInfo *	pAllocationInfo
	)

General purpose memory allocation.

Parameters

	allocator
	pVkMemoryRequirements
	pCreateInfo
[out]	pAllocation	Handle to allocated memory.
[out]	pAllocationInfo	Optional. Information about allocated memory. It can be later fetched using function vmaGetAllocationInfo().

You should free the memory using vmaFreeMemory() or vmaFreeMemoryPages().

It is recommended to use vmaAllocateMemoryForBuffer(), vmaAllocateMemoryForImage(), vmaCreateBuffer(), vmaCreateImage() instead whenever possible.

◆ vmaAllocateMemoryForBuffer()

VkResult vmaAllocateMemoryForBuffer	(	VmaAllocator	allocator,
		VkBuffer	buffer,
		const VmaAllocationCreateInfo *	pCreateInfo,
		VmaAllocation *	pAllocation,
		VmaAllocationInfo *	pAllocationInfo
	)

Parameters

	allocator
	buffer
	pCreateInfo
[out]	pAllocation	Handle to allocated memory.
[out]	pAllocationInfo	Optional. Information about allocated memory. It can be later fetched using function vmaGetAllocationInfo().

You should free the memory using vmaFreeMemory().

◆ vmaAllocateMemoryForImage()

VkResult vmaAllocateMemoryForImage	(	VmaAllocator	allocator,
		VkImage	image,
		const VmaAllocationCreateInfo *	pCreateInfo,
		VmaAllocation *	pAllocation,
		VmaAllocationInfo *	pAllocationInfo
	)

Function similar to vmaAllocateMemoryForBuffer().

◆ vmaAllocateMemoryPages()

VkResult vmaAllocateMemoryPages	(	VmaAllocator	allocator,
		const VkMemoryRequirements *	pVkMemoryRequirements,
		const VmaAllocationCreateInfo *	pCreateInfo,
		size_t	allocationCount,
		VmaAllocation *	pAllocations,
		VmaAllocationInfo *	pAllocationInfo
	)

General purpose memory allocation for multiple allocation objects at once.

Parameters

	allocator	Allocator object.
	pVkMemoryRequirements	Memory requirements for each allocation.
	pCreateInfo	Creation parameters for each allocation.
	allocationCount	Number of allocations to make.
[out]	pAllocations	Pointer to array that will be filled with handles to created allocations.
[out]	pAllocationInfo	Optional. Pointer to array that will be filled with parameters of created allocations.

You should free the memory using vmaFreeMemory() or vmaFreeMemoryPages().

Word "pages" is just a suggestion to use this function to allocate pieces of memory needed for sparse binding. It is just a general purpose allocation function able to make multiple allocations at once. It may be internally optimized to be more efficient than calling vmaAllocateMemory() allocationCount times.

All allocations are made using same parameters. All of them are created out of the same memory pool and type. If any allocation fails, all allocations already made within this function call are also freed, so that when returned result is not VK_SUCCESS, pAllocation array is always entirely filled with VK_NULL_HANDLE.

◆ vmaBeginDefragmentationPass()

VkResult vmaBeginDefragmentationPass	(	VmaAllocator	allocator,
		VmaDefragmentationContext	context,
		VmaDefragmentationPassInfo *	pInfo
	)

◆ vmaBindBufferMemory()

VkResult vmaBindBufferMemory	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkBuffer	buffer
	)

Binds buffer to allocation.

Binds specified buffer to region of memory represented by specified allocation. Gets VkDeviceMemory handle and offset from the allocation. If you want to create a buffer, allocate memory for it and bind them together separately, you should use this function for binding instead of standard vkBindBufferMemory(), because it ensures proper synchronization so that when a VkDeviceMemory object is used by multiple allocations, calls to vkBind*Memory() or vkMapMemory() won't happen from multiple threads simultaneously (which is illegal in Vulkan).

It is recommended to use function vmaCreateBuffer() instead of this one.

◆ vmaBindBufferMemory2()

VkResult vmaBindBufferMemory2	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkDeviceSize	allocationLocalOffset,
		VkBuffer	buffer,
		const void *	pNext
	)

Binds buffer to allocation with additional parameters.

Parameters

allocator
allocation
allocationLocalOffset	Additional offset to be added while binding, relative to the beginning of the `allocation`. Normally it should be 0.
buffer
pNext	A chain of structures to be attached to `VkBindBufferMemoryInfoKHR` structure used internally. Normally it should be null.

This function is similar to vmaBindBufferMemory(), but it provides additional parameters.

If pNext is not null, VmaAllocator object must have been created with VMA_ALLOCATOR_CREATE_KHR_BIND_MEMORY2_BIT flag or with VmaAllocatorCreateInfo::vulkanApiVersion >= VK_API_VERSION_1_1. Otherwise the call fails.

◆ vmaBindImageMemory()

VkResult vmaBindImageMemory	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkImage	image
	)

Binds image to allocation.

Binds specified image to region of memory represented by specified allocation. Gets VkDeviceMemory handle and offset from the allocation. If you want to create an image, allocate memory for it and bind them together separately, you should use this function for binding instead of standard vkBindImageMemory(), because it ensures proper synchronization so that when a VkDeviceMemory object is used by multiple allocations, calls to vkBind*Memory() or vkMapMemory() won't happen from multiple threads simultaneously (which is illegal in Vulkan).

It is recommended to use function vmaCreateImage() instead of this one.

◆ vmaBindImageMemory2()

VkResult vmaBindImageMemory2	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkDeviceSize	allocationLocalOffset,
		VkImage	image,
		const void *	pNext
	)

Binds image to allocation with additional parameters.

Parameters

allocator
allocation
allocationLocalOffset	Additional offset to be added while binding, relative to the beginning of the `allocation`. Normally it should be 0.
image
pNext	A chain of structures to be attached to `VkBindImageMemoryInfoKHR` structure used internally. Normally it should be null.

This function is similar to vmaBindImageMemory(), but it provides additional parameters.

If pNext is not null, VmaAllocator object must have been created with VMA_ALLOCATOR_CREATE_KHR_BIND_MEMORY2_BIT flag or with VmaAllocatorCreateInfo::vulkanApiVersion >= VK_API_VERSION_1_1. Otherwise the call fails.

◆ vmaCheckCorruption()

VkResult vmaCheckCorruption	(	VmaAllocator	allocator,
		uint32_t	memoryTypeBits
	)

Checks magic number in margins around all allocations in given memory types (in both default and custom pools) in search for corruptions.

Parameters

allocator
memoryTypeBits	Bit mask, where each bit set means that a memory type with that index should be checked.

Corruption detection is enabled only when VMA_DEBUG_DETECT_CORRUPTION macro is defined to nonzero, VMA_DEBUG_MARGIN is defined to nonzero and only for memory types that are HOST_VISIBLE and HOST_COHERENT. For more information, see Corruption detection.

Possible return values:

VK_ERROR_FEATURE_NOT_PRESENT - corruption detection is not enabled for any of specified memory types.
VK_SUCCESS - corruption detection has been performed and succeeded.
VK_ERROR_UNKNOWN - corruption detection has been performed and found memory corruptions around one of the allocations. VMA_ASSERT is also fired in that case.
Other value: Error returned by Vulkan, e.g. memory mapping failure.

◆ vmaCheckPoolCorruption()

VkResult vmaCheckPoolCorruption	(	VmaAllocator	allocator,
		VmaPool	pool
	)

Checks magic number in margins around all allocations in given memory pool in search for corruptions.

Corruption detection is enabled only when VMA_DEBUG_DETECT_CORRUPTION macro is defined to nonzero, VMA_DEBUG_MARGIN is defined to nonzero and the pool is created in memory type that is HOST_VISIBLE and HOST_COHERENT. For more information, see Corruption detection.

Possible return values:

VK_ERROR_FEATURE_NOT_PRESENT - corruption detection is not enabled for specified pool.
VK_SUCCESS - corruption detection has been performed and succeeded.
VK_ERROR_UNKNOWN - corruption detection has been performed and found memory corruptions around one of the allocations. VMA_ASSERT is also fired in that case.
Other value: Error returned by Vulkan, e.g. memory mapping failure.

◆ vmaCreateBuffer()

VkResult vmaCreateBuffer	(	VmaAllocator	allocator,
		const VkBufferCreateInfo *	pBufferCreateInfo,
		const VmaAllocationCreateInfo *	pAllocationCreateInfo,
		VkBuffer *	pBuffer,
		VmaAllocation *	pAllocation,
		VmaAllocationInfo *	pAllocationInfo
	)

Parameters

	allocator
	pBufferCreateInfo
	pAllocationCreateInfo
[out]	pBuffer	Buffer that was created.
[out]	pAllocation	Allocation that was created.
[out]	pAllocationInfo	Optional. Information about allocated memory. It can be later fetched using function vmaGetAllocationInfo().

This function automatically:

Creates buffer.
Allocates appropriate memory for it.
Binds the buffer with the memory.

If any of these operations fail, buffer and allocation are not created, returned value is negative error code, *pBuffer and *pAllocation are null.

If the function succeeded, you must destroy both buffer and allocation when you no longer need them using either convenience function vmaDestroyBuffer() or separately, using vkDestroyBuffer() and vmaFreeMemory().

If VMA_ALLOCATOR_CREATE_KHR_DEDICATED_ALLOCATION_BIT flag was used, VK_KHR_dedicated_allocation extension is used internally to query driver whether it requires or prefers the new buffer to have dedicated allocation. If yes, and if dedicated allocation is possible (VmaAllocationCreateInfo::pool is null and VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT is not used), it creates dedicated allocation for this buffer, just like when using VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT.

Note: This function creates a new VkBuffer. Sub-allocation of parts of one large buffer, although recommended as a good practice, is out of scope of this library and could be implemented by the user as a higher-level logic on top of VMA.

◆ vmaCreateBufferWithAlignment()

VkResult vmaCreateBufferWithAlignment	(	VmaAllocator	allocator,
		const VkBufferCreateInfo *	pBufferCreateInfo,
		const VmaAllocationCreateInfo *	pAllocationCreateInfo,
		VkDeviceSize	minAlignment,
		VkBuffer *	pBuffer,
		VmaAllocation *	pAllocation,
		VmaAllocationInfo *	pAllocationInfo
	)

Creates a buffer with additional minimum alignment.

Similar to vmaCreateBuffer() but provides additional parameter minAlignment which allows to specify custom, minimum alignment to be used when placing the buffer inside a larger memory block, which may be needed e.g. for interop with OpenGL.

◆ vmaCreateImage()

VkResult vmaCreateImage	(	VmaAllocator	allocator,
		const VkImageCreateInfo *	pImageCreateInfo,
		const VmaAllocationCreateInfo *	pAllocationCreateInfo,
		VkImage *	pImage,
		VmaAllocation *	pAllocation,
		VmaAllocationInfo *	pAllocationInfo
	)

Function similar to vmaCreateBuffer().

◆ vmaCreatePool()

VkResult vmaCreatePool	(	VmaAllocator	allocator,
		const VmaPoolCreateInfo *	pCreateInfo,
		VmaPool *	pPool
	)

Allocates Vulkan device memory and creates VmaPool object.

Parameters

	allocator	Allocator object.
	pCreateInfo	Parameters of pool to create.
[out]	pPool	Handle to created pool.

◆ vmaDefragment()

VkResult vmaDefragment	(	VmaAllocator	allocator,
		const VmaAllocation *	pAllocations,
		size_t	allocationCount,
		VkBool32 *	pAllocationsChanged,
		const VmaDefragmentationInfo *	pDefragmentationInfo,
		VmaDefragmentationStats *	pDefragmentationStats
	)

Deprecated. Compacts memory by moving allocations.

Parameters

	allocator
	pAllocations	Array of allocations that can be moved during this compation.
	allocationCount	Number of elements in pAllocations and pAllocationsChanged arrays.
[out]	pAllocationsChanged	Array of boolean values that will indicate whether matching allocation in pAllocations array has been moved. This parameter is optional. Pass null if you don't need this information.
	pDefragmentationInfo	Configuration parameters. Optional - pass null to use default values.
[out]	pDefragmentationStats	Statistics returned by the function. Optional - pass null if you don't need this information.

Returns: VK_SUCCESS if completed, negative error code in case of error.

Deprecated:: This is a part of the old interface. It is recommended to use structure VmaDefragmentationInfo2 and function vmaDefragmentationBegin() instead.

This function works by moving allocations to different places (different VkDeviceMemory objects and/or different offsets) in order to optimize memory usage. Only allocations that are in pAllocations array can be moved. All other allocations are considered nonmovable in this call. Basic rules:

Only allocations made in memory types that have VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT and VK_MEMORY_PROPERTY_HOST_COHERENT_BIT flags can be compacted. You may pass other allocations but it makes no sense - these will never be moved.
Custom pools created with VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT or VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT flag are not defragmented. Allocations passed to this function that come from such pools are ignored.
Allocations created with VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT or created as dedicated allocations for any other reason are also ignored.
Both allocations made with or without VMA_ALLOCATION_CREATE_MAPPED_BIT flag can be compacted. If not persistently mapped, memory will be mapped temporarily inside this function if needed.
You must not pass same VmaAllocation object multiple times in pAllocations array.

The function also frees empty VkDeviceMemory blocks.

Warning: This function may be time-consuming, so you shouldn't call it too often (like after every resource creation/destruction). You can call it on special occasions (like when reloading a game level or when you just destroyed a lot of objects). Calling it every frame may be OK, but you should measure that on your platform.

For more information, see Defragmentation chapter.

◆ vmaDefragmentationBegin()

VkResult vmaDefragmentationBegin	(	VmaAllocator	allocator,
		const VmaDefragmentationInfo2 *	pInfo,
		VmaDefragmentationStats *	pStats,
		VmaDefragmentationContext *	pContext
	)

Begins defragmentation process.

Parameters

	allocator	Allocator object.
	pInfo	Structure filled with parameters of defragmentation.
[out]	pStats	Optional. Statistics of defragmentation. You can pass null if you are not interested in this information.
[out]	pContext	Context object that must be passed to vmaDefragmentationEnd() to finish defragmentation.

Returns: VK_SUCCESS and *pContext == null if defragmentation finished within this function call. VK_NOT_READY and *pContext != null if defragmentation has been started and you need to call vmaDefragmentationEnd() to finish it. Negative value in case of error.

Use this function instead of old, deprecated vmaDefragment().

Warning! Between the call to vmaDefragmentationBegin() and vmaDefragmentationEnd():

You should not use any of allocations passed as pInfo->pAllocations or any allocations that belong to pools passed as pInfo->pPools, including calling vmaGetAllocationInfo(), or access their data.
Some mutexes protecting internal data structures may be locked, so trying to make or free any allocations, bind buffers or images, map memory, or launch another simultaneous defragmentation in between may cause stall (when done on another thread) or deadlock (when done on the same thread), unless you are 100% sure that defragmented allocations are in different pools.
Information returned via pStats and pInfo->pAllocationsChanged are undefined. They become valid after call to vmaDefragmentationEnd().
If pInfo->commandBuffer is not null, you must submit that command buffer and make sure it finished execution before calling vmaDefragmentationEnd().

For more information and important limitations regarding defragmentation, see documentation chapter: Defragmentation.

◆ vmaDefragmentationEnd()

VkResult vmaDefragmentationEnd	(	VmaAllocator	allocator,
		VmaDefragmentationContext	context
	)

Ends defragmentation process.

Use this function to finish defragmentation started by vmaDefragmentationBegin(). It is safe to pass context == null. The function then does nothing.

◆ vmaDestroyBuffer()

void vmaDestroyBuffer	(	VmaAllocator	allocator,
		VkBuffer	buffer,
		VmaAllocation	allocation
	)

Destroys Vulkan buffer and frees allocated memory.

This is just a convenience function equivalent to:

vkDestroyBuffer(device, buffer, allocationCallbacks);

vmaFreeMemory(allocator, allocation);

vmaFreeMemory

void vmaFreeMemory(VmaAllocator allocator, const VmaAllocation allocation)

Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(),...

It it safe to pass null as buffer and/or allocation.

◆ vmaDestroyImage()

void vmaDestroyImage	(	VmaAllocator	allocator,
		VkImage	image,
		VmaAllocation	allocation
	)

Destroys Vulkan image and frees allocated memory.

This is just a convenience function equivalent to:

vkDestroyImage(device, image, allocationCallbacks);

vmaFreeMemory(allocator, allocation);

It it safe to pass null as image and/or allocation.

◆ vmaDestroyPool()

void vmaDestroyPool	(	VmaAllocator	allocator,
		VmaPool	pool
	)

Destroys VmaPool object and frees Vulkan device memory.

◆ vmaEndDefragmentationPass()

VkResult vmaEndDefragmentationPass	(	VmaAllocator	allocator,
		VmaDefragmentationContext	context
	)

◆ vmaFindMemoryTypeIndex()

VkResult vmaFindMemoryTypeIndex	(	VmaAllocator	allocator,
		uint32_t	memoryTypeBits,
		const VmaAllocationCreateInfo *	pAllocationCreateInfo,
		uint32_t *	pMemoryTypeIndex
	)

Helps to find memoryTypeIndex, given memoryTypeBits and VmaAllocationCreateInfo.

This algorithm tries to find a memory type that:

Is allowed by memoryTypeBits.
Contains all the flags from pAllocationCreateInfo->requiredFlags.
Matches intended usage.
Has as many flags from pAllocationCreateInfo->preferredFlags as possible.

Returns: Returns VK_ERROR_FEATURE_NOT_PRESENT if not found. Receiving such result from this function or any other allocating function probably means that your device doesn't support any memory type with requested features for the specific type of resource you want to use it for. Please check parameters of your resource, like image layout (OPTIMAL versus LINEAR) or mip level count.

◆ vmaFindMemoryTypeIndexForBufferInfo()

VkResult vmaFindMemoryTypeIndexForBufferInfo	(	VmaAllocator	allocator,
		const VkBufferCreateInfo *	pBufferCreateInfo,
		const VmaAllocationCreateInfo *	pAllocationCreateInfo,
		uint32_t *	pMemoryTypeIndex
	)

Helps to find memoryTypeIndex, given VkBufferCreateInfo and VmaAllocationCreateInfo.

It can be useful e.g. to determine value to be used as VmaPoolCreateInfo::memoryTypeIndex. It internally creates a temporary, dummy buffer that never has memory bound. It is just a convenience function, equivalent to calling:

vkCreateBuffer
vkGetBufferMemoryRequirements
vmaFindMemoryTypeIndex
vkDestroyBuffer

◆ vmaFindMemoryTypeIndexForImageInfo()

VkResult vmaFindMemoryTypeIndexForImageInfo	(	VmaAllocator	allocator,
		const VkImageCreateInfo *	pImageCreateInfo,
		const VmaAllocationCreateInfo *	pAllocationCreateInfo,
		uint32_t *	pMemoryTypeIndex
	)

Helps to find memoryTypeIndex, given VkImageCreateInfo and VmaAllocationCreateInfo.

It can be useful e.g. to determine value to be used as VmaPoolCreateInfo::memoryTypeIndex. It internally creates a temporary, dummy image that never has memory bound. It is just a convenience function, equivalent to calling:

vkCreateImage
vkGetImageMemoryRequirements
vmaFindMemoryTypeIndex
vkDestroyImage

◆ vmaFlushAllocation()

VkResult vmaFlushAllocation	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkDeviceSize	offset,
		VkDeviceSize	size
	)

Flushes memory of given allocation.

Calls vkFlushMappedMemoryRanges() for memory associated with given range of given allocation. It needs to be called after writing to a mapped memory for memory types that are not HOST_COHERENT. Unmap operation doesn't do that automatically.

offset must be relative to the beginning of allocation.
size can be VK_WHOLE_SIZE. It means all memory from offset the the end of given allocation.
offset and size don't have to be aligned. They are internally rounded down/up to multiply of nonCoherentAtomSize.
If size is 0, this call is ignored.
If memory type that the allocation belongs to is not HOST_VISIBLE or it is HOST_COHERENT, this call is ignored.

Warning! offset and size are relative to the contents of given allocation. If you mean whole allocation, you can pass 0 and VK_WHOLE_SIZE, respectively. Do not pass allocation's offset as offset!!!

This function returns the VkResult from vkFlushMappedMemoryRanges if it is called, otherwise VK_SUCCESS.

◆ vmaFlushAllocations()

VkResult vmaFlushAllocations	(	VmaAllocator	allocator,
		uint32_t	allocationCount,
		const VmaAllocation *	allocations,
		const VkDeviceSize *	offsets,
		const VkDeviceSize *	sizes
	)

Flushes memory of given set of allocations.

Calls vkFlushMappedMemoryRanges() for memory associated with given ranges of given allocations. For more information, see documentation of vmaFlushAllocation().

Parameters

allocator
allocationCount
allocations
offsets	If not null, it must point to an array of offsets of regions to flush, relative to the beginning of respective allocations. Null means all ofsets are zero.
sizes	If not null, it must point to an array of sizes of regions to flush in respective allocations. Null means `VK_WHOLE_SIZE` for all allocations.

This function returns the VkResult from vkFlushMappedMemoryRanges if it is called, otherwise VK_SUCCESS.

◆ vmaFreeMemory()

void vmaFreeMemory	(	VmaAllocator	allocator,
		const VmaAllocation	allocation
	)

Frees memory previously allocated using vmaAllocateMemory(), vmaAllocateMemoryForBuffer(), or vmaAllocateMemoryForImage().

Passing VK_NULL_HANDLE as allocation is valid. Such function call is just skipped.

◆ vmaFreeMemoryPages()

void vmaFreeMemoryPages	(	VmaAllocator	allocator,
		size_t	allocationCount,
		const VmaAllocation *	pAllocations
	)

Frees memory and destroys multiple allocations.

Word "pages" is just a suggestion to use this function to free pieces of memory used for sparse binding. It is just a general purpose function to free memory and destroy allocations made using e.g. vmaAllocateMemory(), vmaAllocateMemoryPages() and other functions. It may be internally optimized to be more efficient than calling vmaFreeMemory() allocationCount times.

Allocations in pAllocations array can come from any memory pools and types. Passing VK_NULL_HANDLE as elements of pAllocations array is valid. Such entries are just skipped.

◆ vmaGetAllocationInfo()

void vmaGetAllocationInfo	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VmaAllocationInfo *	pAllocationInfo
	)

Returns current information about specified allocation.

Current paramteres of given allocation are returned in pAllocationInfo.

Although this function doesn't lock any mutex, so it should be quite efficient, you should avoid calling it too often. You can retrieve same VmaAllocationInfo structure while creating your resource, from function vmaCreateBuffer(), vmaCreateImage(). You can remember it if you are sure parameters don't change (e.g. due to defragmentation).

◆ vmaGetAllocationMemoryProperties()

void vmaGetAllocationMemoryProperties	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkMemoryPropertyFlags *	pFlags
	)

Given an allocation, returns Property Flags of its memory type.

This is just a convenience function. Same information can be obtained using vmaGetAllocationInfo() + vmaGetMemoryProperties().

◆ vmaGetPoolName()

void vmaGetPoolName	(	VmaAllocator	allocator,
		VmaPool	pool,
		const char **	ppName
	)

Retrieves name of a custom pool.

After the call ppName is either null or points to an internally-owned null-terminated string containing name of the pool that was previously set. The pointer becomes invalid when the pool is destroyed or its name is changed using vmaSetPoolName().

◆ vmaInvalidateAllocation()

VkResult vmaInvalidateAllocation	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		VkDeviceSize	offset,
		VkDeviceSize	size
	)

Invalidates memory of given allocation.

Calls vkInvalidateMappedMemoryRanges() for memory associated with given range of given allocation. It needs to be called before reading from a mapped memory for memory types that are not HOST_COHERENT. Map operation doesn't do that automatically.

offset must be relative to the beginning of allocation.
size can be VK_WHOLE_SIZE. It means all memory from offset the the end of given allocation.
offset and size don't have to be aligned. They are internally rounded down/up to multiply of nonCoherentAtomSize.
If size is 0, this call is ignored.
If memory type that the allocation belongs to is not HOST_VISIBLE or it is HOST_COHERENT, this call is ignored.

Warning! offset and size are relative to the contents of given allocation. If you mean whole allocation, you can pass 0 and VK_WHOLE_SIZE, respectively. Do not pass allocation's offset as offset!!!

This function returns the VkResult from vkInvalidateMappedMemoryRanges if it is called, otherwise VK_SUCCESS.

◆ vmaInvalidateAllocations()

VkResult vmaInvalidateAllocations	(	VmaAllocator	allocator,
		uint32_t	allocationCount,
		const VmaAllocation *	allocations,
		const VkDeviceSize *	offsets,
		const VkDeviceSize *	sizes
	)

Invalidates memory of given set of allocations.

Calls vkInvalidateMappedMemoryRanges() for memory associated with given ranges of given allocations. For more information, see documentation of vmaInvalidateAllocation().

Parameters

allocator
allocationCount
allocations
offsets	If not null, it must point to an array of offsets of regions to flush, relative to the beginning of respective allocations. Null means all ofsets are zero.
sizes	If not null, it must point to an array of sizes of regions to flush in respective allocations. Null means `VK_WHOLE_SIZE` for all allocations.

This function returns the VkResult from vkInvalidateMappedMemoryRanges if it is called, otherwise VK_SUCCESS.

◆ vmaMapMemory()

VkResult vmaMapMemory	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		void **	ppData
	)

Maps memory represented by given allocation and returns pointer to it.

Maps memory represented by given allocation to make it accessible to CPU code. When succeeded, *ppData contains pointer to first byte of this memory.

Warning: If the allocation is part of a bigger VkDeviceMemory block, returned pointer is correctly offsetted to the beginning of region assigned to this particular allocation. Unlike the result of vkMapMemory, it points to the allocation, not to the beginning of the whole block. You should not add VmaAllocationInfo::offset to it!

Mapping is internally reference-counted and synchronized, so despite raw Vulkan function vkMapMemory() cannot be used to map same block of VkDeviceMemory multiple times simultaneously, it is safe to call this function on allocations assigned to the same memory block. Actual Vulkan memory will be mapped on first mapping and unmapped on last unmapping.

If the function succeeded, you must call vmaUnmapMemory() to unmap the allocation when mapping is no longer needed or before freeing the allocation, at the latest.

It also safe to call this function multiple times on the same allocation. You must call vmaUnmapMemory() same number of times as you called vmaMapMemory().

It is also safe to call this function on allocation created with VMA_ALLOCATION_CREATE_MAPPED_BIT flag. Its memory stays mapped all the time. You must still call vmaUnmapMemory() same number of times as you called vmaMapMemory(). You must not call vmaUnmapMemory() additional time to free the "0-th" mapping made automatically due to VMA_ALLOCATION_CREATE_MAPPED_BIT flag.

This function fails when used on allocation made in memory type that is not HOST_VISIBLE.

This function doesn't automatically flush or invalidate caches. If the allocation is made from a memory types that is not HOST_COHERENT, you also need to use vmaInvalidateAllocation() / vmaFlushAllocation(), as required by Vulkan specification.

◆ vmaSetAllocationUserData()

void vmaSetAllocationUserData	(	VmaAllocator	allocator,
		VmaAllocation	allocation,
		void *	pUserData
	)

Sets pUserData in given allocation to new value.

If the allocation was created with VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT, pUserData must be either null, or pointer to a null-terminated string. The function makes local copy of the string and sets it as allocation's pUserData. String passed as pUserData doesn't need to be valid for whole lifetime of the allocation - you can free it after this call. String previously pointed by allocation's pUserData is freed from memory.

If the flag was not used, the value of pointer pUserData is just copied to allocation's pUserData. It is opaque, so you can use it however you want - e.g. as a pointer, ordinal number or some handle to you own data.

◆ vmaSetPoolName()

void vmaSetPoolName	(	VmaAllocator	allocator,
		VmaPool	pool,
		const char *	pName
	)

Sets name of a custom pool.

pName can be either null or pointer to a null-terminated string with new name for the pool. Function makes internal copy of the string, so it can be changed or freed immediately after this call.

◆ vmaUnmapMemory()

void vmaUnmapMemory	(	VmaAllocator	allocator,
		VmaAllocation	allocation
	)

Unmaps memory represented by given allocation, mapped previously using vmaMapMemory().

For details, see description of vmaMapMemory().

This function doesn't automatically flush or invalidate caches. If the allocation is made from a memory types that is not HOST_COHERENT, you also need to use vmaInvalidateAllocation() / vmaFlushAllocation(), as required by Vulkan specification.

Classes

Typedefs

Enumerations

Functions

Detailed Description

Typedef Documentation

◆ VmaAllocationCreateFlagBits

◆ VmaAllocationCreateFlags

◆ VmaAllocationCreateInfo

◆ VmaAllocationInfo

◆ VmaDefragmentationFlagBits

◆ VmaDefragmentationFlags

◆ VmaDefragmentationInfo

◆ VmaDefragmentationInfo2

◆ VmaDefragmentationPassInfo

◆ VmaDefragmentationPassMoveInfo

◆ VmaDefragmentationStats

◆ VmaMemoryUsage

◆ VmaPoolCreateFlagBits

◆ VmaPoolCreateFlags

◆ VmaPoolCreateInfo

Enumeration Type Documentation

◆ VmaAllocationCreateFlagBits

◆ VmaDefragmentationFlagBits

◆ VmaMemoryUsage

◆ VmaPoolCreateFlagBits

Function Documentation

◆ vmaAllocateMemory()

◆ vmaAllocateMemoryForBuffer()

◆ vmaAllocateMemoryForImage()

◆ vmaAllocateMemoryPages()

◆ vmaBeginDefragmentationPass()

◆ vmaBindBufferMemory()

◆ vmaBindBufferMemory2()

◆ vmaBindImageMemory()

◆ vmaBindImageMemory2()

◆ vmaCheckCorruption()

◆ vmaCheckPoolCorruption()

◆ vmaCreateBuffer()

◆ vmaCreateBufferWithAlignment()

◆ vmaCreateImage()

◆ vmaCreatePool()

◆ vmaDefragment()

◆ vmaDefragmentationBegin()

◆ vmaDefragmentationEnd()

◆ vmaDestroyBuffer()

◆ vmaDestroyImage()

◆ vmaDestroyPool()

◆ vmaEndDefragmentationPass()

◆ vmaFindMemoryTypeIndex()

◆ vmaFindMemoryTypeIndexForBufferInfo()

◆ vmaFindMemoryTypeIndexForImageInfo()

◆ vmaFlushAllocation()

◆ vmaFlushAllocations()

◆ vmaFreeMemory()

◆ vmaFreeMemoryPages()

◆ vmaGetAllocationInfo()

◆ vmaGetAllocationMemoryProperties()

◆ vmaGetPoolName()

◆ vmaInvalidateAllocation()

◆ vmaInvalidateAllocations()

◆ vmaMapMemory()

◆ vmaSetAllocationUserData()

◆ vmaSetPoolName()

◆ vmaUnmapMemory()