29. Sparse Resources

    As documented in Resource Memory Association, VkBuffer and VkImage resources in Vulkan must be bound completely and contiguously to a single VkDeviceMemory object. This binding must be done before the resource is used, and the binding is immutable for the lifetime of the resource.

    Sparse resources relax these restrictions and provide these additional features:

    • Sparse resources can be bound non-contiguously to one or more VkDeviceMemory allocations.

    • Sparse resources can be re-bound to different memory allocations over the lifetime of the resource.

    • Sparse resources can have descriptors generated and used orthogonally with memory binding commands.

    29.1. Sparse Resource Features

    Sparse resources have several features that must be enabled explicitly at resource creation time. The features are enabled by including bits in the flags parameter of VkImageCreateInfo or VkBufferCreateInfo. Each feature also has one or more corresponding feature enables specified in VkPhysicalDeviceFeatures.

    • Sparse binding is the base feature, and provides the following capabilities:

      • Resources can be bound at some defined (sparse block) granularity.

      • The entire resource must be bound to memory before use regardless of regions actually accessed.

      • No specific mapping of image region to memory offset is defined, i.e. the location that each texel corresponds to in memory is implementation-dependent.

      • Sparse buffers have a well-defined mapping of buffer range to memory range, where an offset into a range of the buffer that is bound to a single contiguous range of memory corresponds to an identical offset within that range of memory.

      • Requested via the VK_IMAGE_CREATE_SPARSE_BINDING_BIT and VK_BUFFER_CREATE_SPARSE_BINDING_BIT bits.

      • A sparse image created using VK_IMAGE_CREATE_SPARSE_BINDING_BIT (but not VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT) supports all formats that non-sparse usage supports, and supports both VK_IMAGE_TILING_OPTIMAL and VK_IMAGE_TILING_LINEAR tiling.

    • Sparse Residency builds on (and requires) the sparseBinding feature. It includes the following capabilities:

      • Resources do not have to be completely bound to memory before use on the device.

      • Images have a prescribed sparse image block layout, allowing specific rectangular regions of the image to be bound to specific offsets in memory allocations.

      • Consistency of access to unbound regions of the resource is defined by the absence or presence of VkPhysicalDeviceSparseProperties::residencyNonResidentStrict. If this property is present, accesses to unbound regions of the resource are well defined and behave as if the data bound is populated with all zeros; writes are discarded. When this property is absent, accesses are considered safe, but reads will return undefined values.

      • Requested via the VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT and VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT bits.

      • Sparse residency support is advertised on a finer grain via the following features:

        • sparseResidencyBuffer: Support for creating VkBuffer objects with the VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT.

        • sparseResidencyImage2D: Support for creating 2D single-sampled VkImage objects with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

        • sparseResidencyImage3D: Support for creating 3D VkImage objects with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

        • sparseResidency2Samples: Support for creating 2D VkImage objects with 2 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

        • sparseResidency4Samples: Support for creating 2D VkImage objects with 4 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

        • sparseResidency8Samples: Support for creating 2D VkImage objects with 8 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

        • sparseResidency16Samples: Support for creating 2D VkImage objects with 16 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

        Implementations supporting sparseResidencyImage2D are only required to support sparse 2D, single-sampled images. Support for sparse 3D and MSAA images is optional and can be enabled via sparseResidencyImage3D, sparseResidency2Samples, sparseResidency4Samples, sparseResidency8Samples, and sparseResidency16Samples.

      • A sparse image created using VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT supports all non-compressed color formats with power-of-two element size that non-sparse usage supports. Additional formats may also be supported and can be queried via vkGetPhysicalDeviceSparseImageFormatProperties. VK_IMAGE_TILING_LINEAR tiling is not supported.

    • Sparse aliasing provides the following capability that can be enabled per resource:

      Allows physical memory ranges to be shared between multiple locations in the same sparse resource or between multiple sparse resources, with each binding of a memory location observing a consistent interpretation of the memory contents.

      See Sparse Memory Aliasing for more information.

    29.2. Sparse Buffers and Fully-Resident Images

    Both VkBuffer and VkImage objects created with the VK_IMAGE_CREATE_SPARSE_BINDING_BIT or VK_BUFFER_CREATE_SPARSE_BINDING_BIT bits can be thought of as a linear region of address space. In the VkImage case if VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT is not used, this linear region is entirely opaque, meaning that there is no application-visible mapping between texel location and memory offset.

    Unless VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT or VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT are also used, the entire resource must be bound to one or more VkDeviceMemory objects before use.

    29.2.1. Sparse Buffer and Fully-Resident Image Block Size

    The sparse block size in bytes for sparse buffers and fully-resident images is reported as VkMemoryRequirements::alignment. alignment represents both the memory alignment requirement and the binding granularity (in bytes) for sparse resources.

    29.3. Sparse Partially-Resident Buffers

    VkBuffer objects created with the VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT bit allow the buffer to be made only partially resident. Partially resident VkBuffer objects are allocated and bound identically to VkBuffer objects using only the VK_BUFFER_CREATE_SPARSE_BINDING_BIT feature. The only difference is the ability for some regions of the buffer to be unbound during device use.

    29.4. Sparse Partially-Resident Images

    VkImage objects created with the VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT bit allow specific rectangular regions of the image called sparse image blocks to be bound to specific ranges of memory. This allows the application to manage residency at either image subresource or sparse image block granularity. Each image subresource (outside of the mip tail) starts on a sparse block boundary and has dimensions that are integer multiples of the corresponding dimensions of the sparse image block.

    Note

    Applications can use these types of images to control LOD based on total memory consumption. If memory pressure becomes an issue the application can unbind and disable specific mipmap levels of images without having to recreate resources or modify texel data of unaffected levels.

    The application can also use this functionality to access subregions of the image in a “megatexture” fashion. The application can create a large image and only populate the region of the image that is currently being used in the scene.

    29.4.1. Accessing Unbound Regions

    The following member of VkPhysicalDeviceSparseProperties affects how data in unbound regions of sparse resources are handled by the implementation:

    • residencyNonResidentStrict

    If this property is not present, reads of unbound regions of the image will return undefined values. Both reads and writes are still considered safe and will not affect other resources or populated regions of the image.

    If this property is present, all reads of unbound regions of the image will behave as if the region was bound to memory populated with all zeros; writes will be discarded.

    Formatted accesses to unbound memory may still alter some component values in the natural way for those accesses, e.g. substituting a value of one for alpha in formats that do not have an alpha component.

    Example: Reading the alpha component of an unbacked VK_FORMAT_R8_UNORM image will return a value of 1.0f.

    See Physical Device Enumeration for instructions for retrieving physical device properties.

    Implementor’s Note

    For implementations that cannot natively handle access to unbound regions of a resource, the implementation may allocate and bind memory to the unbound regions. Reads and writes to unbound regions will access the implementation-managed memory instead.

    Given that the values resulting from reads of unbound regions are undefined in this scenario, implementations may use the same physical memory for all unbound regions of multiple resources within the same process.

    29.4.2. Mip Tail Regions

    Sparse images created using VK_IMAGE_CREATE_SPARSE_BINDING_BIT (without also using VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT) have no specific mapping of image region or image subresource to memory offset defined, so the entire image can be thought of as a linear opaque address region. However, images created with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT do have a prescribed sparse image block layout, and hence each image subresource must start on a sparse block boundary. Within each array layer, the set of mip levels that have a smaller size than the sparse block size in bytes are grouped together into a mip tail region.

    If the VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT flag is present in the flags member of VkSparseImageFormatProperties, for the image’s format, then any mip level which has dimensions that are not integer multiples of the corresponding dimensions of the sparse image block, and all subsequent mip levels, are also included in the mip tail region.

    The following member of VkPhysicalDeviceSparseProperties may affect how the implementation places mip levels in the mip tail region:

    • residencyAlignedMipSize

    Each mip tail region is bound to memory as an opaque region (i.e. must be bound using a VkSparseImageOpaqueMemoryBindInfo structure) and may be of a size greater than or equal to the sparse block size in bytes. This size is guaranteed to be an integer multiple of the sparse block size in bytes.

    An implementation may choose to allow each array-layer’s mip tail region to be bound to memory independently or require that all array-layer’s mip tail regions be treated as one. This is dictated by VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT in VkSparseImageMemoryRequirements::flags.

    The following diagrams depict how VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT and VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT alter memory usage and requirements.

    image/svg+xml Array Layer 0 Array Layer 1 Array Layer 2 MipLevel 0 MipLevel 1 MipLevel 3 MipLevel 2 Mip Tail Legend Image Pixel Data Sparse Memory Block Mip Tail Data
    Figure 17. Sparse Image

    In the absence of VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT and VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT, each array layer contains a mip tail region containing texel data for all mip levels smaller than the sparse image block in any dimension.

    Mip levels that are as large or larger than a sparse image block in all dimensions can be bound individually. Right-edges and bottom-edges of each level are allowed to have partially used sparse blocks. Any bound partially-used-sparse-blocks must still have their full sparse block size in bytes allocated in memory.

    image/svg+xml Array Layer 0 Array Layer 1 Array Layer 2 MipLevel 0 MipLevel 1 MipLevel 3 MipLevel 2 Mip Tail Legend Image Pixel Data Sparse Memory Block Mip Tail Data
    Figure 18. Sparse Image with Single Mip Tail

    When VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT is present all array layers will share a single mip tail region.

    image/svg+xml Array Layer 0 Array Layer 1 Array Layer 2 MipLevel 0 MipLevel 1 Mip Tail Legend Image Pixel Data Sparse Memory Block Mip Tail Data
    Figure 19. Sparse Image with Aligned Mip Size
    Note

    The mip tail regions are presented here in 2D arrays simply for figure size reasons. Each mip tail is logically a single array of sparse blocks with an implementation-dependent mapping of texels or compressed texel blocks to sparse blocks.

    When VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT is present the first mip level that would contain partially used sparse blocks begins the mip tail region. This level and all subsequent levels are placed in the mip tail. Only the first N mip levels whose dimensions are an exact multiple of the sparse image block dimensions can be bound and unbound on a sparse block basis.

    image/svg+xml Array Layer 0 Array Layer 1 Array Layer 2 MipLevel 0 MipLevel 1 Mip Tail Legend Image Pixel Data Sparse Memory Block Mip Tail Data
    Figure 20. Sparse Image with Aligned Mip Size and Single Mip Tail
    Note

    The mip tail region is presented here in a 2D array simply for figure size reasons. It is logically a single array of sparse blocks with an implementation-dependent mapping of texels or compressed texel blocks to sparse blocks.

    When both VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT and VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT are present the constraints from each of these flags are in effect.

    29.4.3. Standard Sparse Image Block Shapes

    Standard sparse image block shapes define a standard set of dimensions for sparse image blocks that depend on the format of the image. Layout of texels or compressed texel blocks within a sparse image block is implementation dependent. All currently defined standard sparse image block shapes are 64 KB in size.

    For block-compressed formats (e.g. VK_FORMAT_BC5_UNORM_BLOCK), the texel size is the size of the compressed texel block (e.g. 128-bit for BC5) thus the dimensions of the standard sparse image block shapes apply in terms of compressed texel blocks.

    Note

    For block-compressed formats, the dimensions of a sparse image block in terms of texels can be calculated by multiplying the sparse image block dimensions by the compressed texel block dimensions.
    Table 35. Standard Sparse Image Block Shapes (Single Sample)
    TEXEL SIZE (bits) Block Shape (2D) Block Shape (3D)

    8-Bit

    256 × 256 × 1

    64 × 32 × 32

    16-Bit

    256 × 128 × 1

    32 × 32 × 32

    32-Bit

    128 × 128 × 1

    32 × 32 × 16

    64-Bit

    128 × 64 × 1

    32 × 16 × 16

    128-Bit

    64 × 64 × 1

    16 × 16 × 16
    Table 36. Standard Sparse Image Block Shapes (MSAA)
    TEXEL SIZE (bits) Block Shape (2X) Block Shape (4X) Block Shape (8X) Block Shape (16X)

    8-Bit

    128 × 256 × 1

    128 × 128 × 1

    64 × 128 × 1

    64 × 64 × 1

    16-Bit

    128 × 128 × 1

    128 × 64 × 1

    64 × 64 × 1

    64 × 32 × 1

    32-Bit

    64 × 128 × 1

    64 × 64 × 1

    32 × 64 × 1

    32 × 32 × 1

    64-Bit

    64 × 64 × 1

    64 × 32 × 1

    32 × 32 × 1

    32 × 16 × 1

    128-Bit

    32 × 64 × 1

    32 × 32 × 1

    16 × 32 × 1

    16 × 16 × 1

    Implementations that support the standard sparse image block shape for all formats listed in the Standard Sparse Image Block Shapes (Single Sample) and Standard Sparse Image Block Shapes (MSAA) tables may advertise the following VkPhysicalDeviceSparseProperties:

    • residencyStandard2DBlockShape

    • residencyStandard2DMultisampleBlockShape

    • residencyStandard3DBlockShape

    Reporting each of these features does not imply that all possible image types are supported as sparse. Instead, this indicates that no supported sparse image of the corresponding type will use custom sparse image block dimensions for any formats that have a corresponding standard sparse image block shape.

    29.4.4. Custom Sparse Image Block Shapes

    An implementation that does not support a standard image block shape for a particular sparse partially-resident image may choose to support a custom sparse image block shape for it instead. The dimensions of such a custom sparse image block shape are reported in VkSparseImageFormatProperties::imageGranularity. As with standard sparse image block shapes, the size in bytes of the custom sparse image block shape will be reported in VkMemoryRequirements::alignment.

    Custom sparse image block dimensions are reported through vkGetPhysicalDeviceSparseImageFormatProperties and vkGetImageSparseMemoryRequirements.

    An implementation must not support both the standard sparse image block shape and a custom sparse image block shape for the same image. The standard sparse image block shape must be used if it is supported.

    29.4.5. Multiple Aspects

    Partially resident images are allowed to report separate sparse properties for different aspects of the image. One example is for depth/stencil images where the implementation separates the depth and stencil data into separate planes. Another reason for multiple aspects is to allow the application to manage memory allocation for implementation-private metadata associated with the image. See the figure below:

    image/svg+xml Depth Stencil MipLevel 0 MipLevel 1 MipLevel 3 MipLevel 2 Mip Tail Mip Tail Metadata Legend Image Pixel Data Sparse Memory Block Mip Tail Data
    Figure 21. Multiple Aspect Sparse Image
    Note

    The mip tail regions are presented here in 2D arrays simply for figure size reasons. Each mip tail is logically a single array of sparse blocks with an implementation-dependent mapping of texels or compressed texel blocks to sparse blocks.

    In the figure above the depth, stencil, and metadata aspects all have unique sparse properties. The per-texel stencil data is ¼ the size of the depth data, hence the stencil sparse blocks include 4 × the number of texels. The sparse block size in bytes for all of the aspects is identical and defined by VkMemoryRequirements::alignment.

    Metadata

    The metadata aspect of an image has the following constraints:

    • All metadata is reported in the mip tail region of the metadata aspect.

    • All metadata must be bound prior to device use of the sparse image.

    29.5. Sparse Memory Aliasing

    By default sparse resources have the same aliasing rules as non-sparse resources. See Memory Aliasing for more information.

    VkDevice objects that have the sparseResidencyAliased feature enabled are able to use the VK_BUFFER_CREATE_SPARSE_ALIASED_BIT and VK_IMAGE_CREATE_SPARSE_ALIASED_BIT flags for resource creation. These flags allow resources to access physical memory bound into multiple locations within one or more sparse resources in a data consistent fashion. This means that reading physical memory from multiple aliased locations will return the same value.

    Care must be taken when performing a write operation to aliased physical memory. Memory dependencies must be used to separate writes to one alias from reads or writes to another alias. Writes to aliased memory that are not properly guarded against accesses to different aliases will have undefined results for all accesses to the aliased memory.

    Applications that wish to make use of data consistent sparse memory aliasing must abide by the following guidelines:

    • All sparse resources that are bound to aliased physical memory must be created with the VK_BUFFER_CREATE_SPARSE_ALIASED_BIT / VK_IMAGE_CREATE_SPARSE_ALIASED_BIT flag.

    • All resources that access aliased physical memory must interpret the memory in the same way. This implies the following:

      • Buffers and images cannot alias the same physical memory in a data consistent fashion. The physical memory ranges must be used exclusively by buffers or used exclusively by images for data consistency to be guaranteed.

      • Memory in sparse image mip tail regions cannot access aliased memory in a data consistent fashion.

      • Sparse images that alias the same physical memory must have compatible formats and be using the same sparse image block shape in order to access aliased memory in a data consistent fashion.

    Failure to follow any of the above guidelines will require the application to abide by the normal, non-sparse resource aliasing rules. In this case memory cannot be accessed in a data consistent fashion.

    Note

    Enabling sparse resource memory aliasing can be a way to lower physical memory use, but it may reduce performance on some implementations. An application developer can test on their target HW and balance the memory / performance trade-offs measured.

    29.6. Sparse Resource Implementation Guidelines (Informative)

    This section is Informative. It is included to aid in implementors’ understanding of sparse resources.

    Device Virtual Address

    The basic sparseBinding feature allows the resource to reserve its own device virtual address range at resource creation time rather than relying on a bind operation to set this. Without any other creation flags, no other constraints are relaxed compared to normal resources. All pages must be bound to physical memory before the device accesses the resource.

    The sparse residency features allow sparse resources to be used even when not all pages are bound to memory. Implementations that support access to unbound pages without causing a fault may support residencyNonResidentStrict.

    Not faulting on access to unbound pages is not enough to support residencyNonResidentStrict. An implementation must also guarantee that reads after writes to unbound regions of the resource always return data for the read as if the memory contains zeros. Depending on any caching hierarchy of the implementation this may not always be possible.

    Any implementation that does not fault, but does not guarantee correct read values must not support residencyNonResidentStrict.

    Any implementation that cannot access unbound pages without causing a fault will require the implementation to bind the entire device virtual address range to physical memory. Any pages that the application does not bind to memory may be bound to one (or more) "`placeholder" physical page(s) allocated by the implementation. Given the following properties:

    • A process must not access memory from another process

    • Reads return undefined values

    It is sufficient for each host process to allocate these placeholder pages and use them for all resources in that process. Implementations may allocate more often (per instance, per device, or per resource).

    Binding Memory

    The byte size reported in VkMemoryRequirements::size must be greater than or equal to the amount of physical memory required to fully populate the resource. Some implementations require “holes” in the device virtual address range that are never accessed. These holes may be included in the size reported for the resource.

    Including or not including the device virtual address holes in the resource size will alter how the implementation provides support for VkSparseImageOpaqueMemoryBindInfo. This operation must be supported for all sparse images, even ones created with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • If the holes are included in the size, this bind function becomes very easy. In most cases the resourceOffset is simply a device virtual address offset and the implementation can easily determine what device virtual address to bind. The cost is that the application may allocate more physical memory for the resource than it needs.

    • If the holes are not included in the size, the application can allocate less physical memory than otherwise for the resource. However, in this case the implementation must account for the holes when mapping resourceOffset to the actual device virtual address intended to be mapped.

    Note

    If the application always uses VkSparseImageMemoryBindInfo to bind memory for the non-tail mip levels, any holes that are present in the resource size may never be bound.

    Since VkSparseImageMemoryBindInfo uses texel locations to determine which device virtual addresses to bind, it is impossible to bind device virtual address holes with this operation.
    Binding Metadata Memory

    All metadata for sparse images have their own sparse properties and are embedded in the mip tail region for said properties. See the Multiaspect section for details.

    Given that metadata is in a mip tail region, and the mip tail region must be reported as contiguous (either globally or per-array-layer), some implementations will have to resort to complicated offset → device virtual address mapping for handling VkSparseImageOpaqueMemoryBindInfo.

    To make this easier on the implementation, the VK_SPARSE_MEMORY_BIND_METADATA_BIT explicitly specifies when metadata is bound with VkSparseImageOpaqueMemoryBindInfo. When this flag is not present, the resourceOffset may be treated as a strict device virtual address offset.

    When VK_SPARSE_MEMORY_BIND_METADATA_BIT is present, the resourceOffset must have been derived explicitly from the imageMipTailOffset in the sparse resource properties returned for the metadata aspect. By manipulating the value returned for imageMipTailOffset, the resourceOffset does not have to correlate directly to a device virtual address offset, and may instead be whatever value makes it easiest for the implementation to derive the correct device virtual address.

    29.7. Sparse Resource API

    The APIs related to sparse resources are grouped into the following categories:

    29.7.1. Physical Device Features

    Some sparse-resource related features are reported and enabled in VkPhysicalDeviceFeatures. These features must be supported and enabled on the VkDevice object before applications can use them. See Physical Device Features for information on how to get and set enabled device features, and for more detailed explanations of these features.

    Sparse Physical Device Features

    • sparseBinding: Support for creating VkBuffer and VkImage objects with the VK_BUFFER_CREATE_SPARSE_BINDING_BIT and VK_IMAGE_CREATE_SPARSE_BINDING_BIT flags, respectively.

    • sparseResidencyBuffer: Support for creating VkBuffer objects with the VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT flag.

    • sparseResidencyImage2D: Support for creating 2D single-sampled VkImage objects with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • sparseResidencyImage3D: Support for creating 3D VkImage objects with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • sparseResidency2Samples: Support for creating 2D VkImage objects with 2 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • sparseResidency4Samples: Support for creating 2D VkImage objects with 4 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • sparseResidency8Samples: Support for creating 2D VkImage objects with 8 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • sparseResidency16Samples: Support for creating 2D VkImage objects with 16 samples and VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT.

    • sparseResidencyAliased: Support for creating VkBuffer and VkImage objects with the VK_BUFFER_CREATE_SPARSE_ALIASED_BIT and VK_IMAGE_CREATE_SPARSE_ALIASED_BIT flags, respectively.

    29.7.2. Physical Device Sparse Properties

    Some features of the implementation are not possible to disable, and are reported to allow applications to alter their sparse resource usage accordingly. These read-only capabilities are reported in the VkPhysicalDeviceProperties::sparseProperties member, which is a VkPhysicalDeviceSparseProperties structure.

    The VkPhysicalDeviceSparseProperties structure is defined as:

    // Provided by VK_VERSION_1_0
typedef struct VkPhysicalDeviceSparseProperties {
    VkBool32    residencyStandard2DBlockShape;
    VkBool32    residencyStandard2DMultisampleBlockShape;
    VkBool32    residencyStandard3DBlockShape;
    VkBool32    residencyAlignedMipSize;
    VkBool32    residencyNonResidentStrict;
} VkPhysicalDeviceSparseProperties;

    • residencyStandard2DBlockShape is VK_TRUE if the physical device will access all single-sample 2D sparse resources using the standard sparse image block shapes (based on image format), as described in the Standard Sparse Image Block Shapes (Single Sample) table. If this property is not supported the value returned in the imageGranularity member of the VkSparseImageFormatProperties structure for single-sample 2D images is not required to match the standard sparse image block dimensions listed in the table.

    • residencyStandard2DMultisampleBlockShape is VK_TRUE if the physical device will access all multisample 2D sparse resources using the standard sparse image block shapes (based on image format), as described in the Standard Sparse Image Block Shapes (MSAA) table. If this property is not supported, the value returned in the imageGranularity member of the VkSparseImageFormatProperties structure for multisample 2D images is not required to match the standard sparse image block dimensions listed in the table.

    • residencyStandard3DBlockShape is VK_TRUE if the physical device will access all 3D sparse resources using the standard sparse image block shapes (based on image format), as described in the Standard Sparse Image Block Shapes (Single Sample) table. If this property is not supported, the value returned in the imageGranularity member of the VkSparseImageFormatProperties structure for 3D images is not required to match the standard sparse image block dimensions listed in the table.

    • residencyAlignedMipSize is VK_TRUE if images with mip level dimensions that are not integer multiples of the corresponding dimensions of the sparse image block may be placed in the mip tail. If this property is not reported, only mip levels with dimensions smaller than the imageGranularity member of the VkSparseImageFormatProperties structure will be placed in the mip tail. If this property is reported the implementation is allowed to return VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT in the flags member of VkSparseImageFormatProperties, indicating that mip level dimensions that are not integer multiples of the corresponding dimensions of the sparse image block will be placed in the mip tail.

    • residencyNonResidentStrict specifies whether the physical device can consistently access non-resident regions of a resource. If this property is VK_TRUE, access to non-resident regions of resources will be guaranteed to return values as if the resource was populated with 0; writes to non-resident regions will be discarded.

    29.7.3. Sparse Image Format Properties

    Given that certain aspects of sparse image support, including the sparse image block dimensions, may be implementation-dependent, vkGetPhysicalDeviceSparseImageFormatProperties can be used to query for sparse image format properties prior to resource creation. This command is used to check whether a given set of sparse image parameters is supported and what the sparse image block shape will be.

    Sparse Image Format Properties API

    The VkSparseImageFormatProperties structure is defined as:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseImageFormatProperties {
    VkImageAspectFlags          aspectMask;
    VkExtent3D                  imageGranularity;
    VkSparseImageFormatFlags    flags;
} VkSparseImageFormatProperties;

    • aspectMask is a bitmask VkImageAspectFlagBits specifying which aspects of the image the properties apply to.

    • imageGranularity is the width, height, and depth of the sparse image block in texels or compressed texel blocks.

    • flags is a bitmask of VkSparseImageFormatFlagBits specifying additional information about the sparse resource.

    Bits which may be set in VkSparseImageFormatProperties::flags, specifying additional information about the sparse resource, are:

    // Provided by VK_VERSION_1_0
typedef enum VkSparseImageFormatFlagBits {
    VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT = 0x00000001,
    VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT = 0x00000002,
    VK_SPARSE_IMAGE_FORMAT_NONSTANDARD_BLOCK_SIZE_BIT = 0x00000004,
} VkSparseImageFormatFlagBits;

    • VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT specifies that the image uses a single mip tail region for all array layers.

    • VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT specifies that the first mip level whose dimensions are not integer multiples of the corresponding dimensions of the sparse image block begins the mip tail region.

    • VK_SPARSE_IMAGE_FORMAT_NONSTANDARD_BLOCK_SIZE_BIT specifies that the image uses non-standard sparse image block dimensions, and the imageGranularity values do not match the standard sparse image block dimensions for the given format.

    // Provided by VK_VERSION_1_0
typedef VkFlags VkSparseImageFormatFlags;

    VkSparseImageFormatFlags is a bitmask type for setting a mask of zero or more VkSparseImageFormatFlagBits.

    vkGetPhysicalDeviceSparseImageFormatProperties returns an array of VkSparseImageFormatProperties. Each element will describe properties for one set of image aspects that are bound simultaneously in the image. This is usually one element for each aspect in the image, but for interleaved depth/stencil images there is only one element describing the combined aspects.

    // Provided by VK_VERSION_1_0
void vkGetPhysicalDeviceSparseImageFormatProperties(
    VkPhysicalDevice                            physicalDevice,
    VkFormat                                    format,
    VkImageType                                 type,
    VkSampleCountFlagBits                       samples,
    VkImageUsageFlags                           usage,
    VkImageTiling                               tiling,
    uint32_t*                                   pPropertyCount,
    VkSparseImageFormatProperties*              pProperties);

    • physicalDevice is the physical device from which to query the sparse image format properties.

    • format is the image format.

    • type is the dimensionality of image.

    • samples is a VkSampleCountFlagBits value specifying the number of samples per texel.

    • usage is a bitmask describing the intended usage of the image.

    • tiling is the tiling arrangement of the texel blocks in memory.

    • pPropertyCount is a pointer to an integer related to the number of sparse format properties available or queried, as described below.

    • pProperties is either NULL or a pointer to an array of VkSparseImageFormatProperties structures.

    If pProperties is NULL, then the number of sparse format properties available is returned in pPropertyCount. Otherwise, pPropertyCount must point to a variable set by the user to the number of elements in the pProperties array, and on return the variable is overwritten with the number of structures actually written to pProperties. If pPropertyCount is less than the number of sparse format properties available, at most pPropertyCount structures will be written.

    If VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT is not supported for the given arguments, pPropertyCount will be set to zero upon return, and no data will be written to pProperties.

    Multiple aspects are returned for depth/stencil images that are implemented as separate planes by the implementation. The depth and stencil data planes each have unique VkSparseImageFormatProperties data.

    Depth/stencil images with depth and stencil data interleaved into a single plane will return a single VkSparseImageFormatProperties structure with the aspectMask set to VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT.

    Valid Usage

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-samples-01094
      samples must be a bit value that is set in VkImageFormatProperties::sampleCounts returned by vkGetPhysicalDeviceImageFormatProperties with format, type, tiling, and usage equal to those in this command and flags equal to the value that is set in VkImageCreateInfo::flags when the image is created

    Valid Usage (Implicit)

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-physicalDevice-parameter
      physicalDevice must be a valid VkPhysicalDevice handle

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-format-parameter
      format must be a valid VkFormat value

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-type-parameter
      type must be a valid VkImageType value

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-samples-parameter
      samples must be a valid VkSampleCountFlagBits value

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-usage-parameter
      usage must be a valid combination of VkImageUsageFlagBits values

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-usage-requiredbitmask
      usage must not be 0

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-tiling-parameter
      tiling must be a valid VkImageTiling value

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-pPropertyCount-parameter
      pPropertyCount must be a valid pointer to a uint32_t value

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties-pProperties-parameter
      If the value referenced by pPropertyCount is not 0, and pProperties is not NULL, pProperties must be a valid pointer to an array of pPropertyCount VkSparseImageFormatProperties structures

    vkGetPhysicalDeviceSparseImageFormatProperties2 returns an array of VkSparseImageFormatProperties2. Each element will describe properties for one set of image aspects that are bound simultaneously in the image. This is usually one element for each aspect in the image, but for interleaved depth/stencil images there is only one element describing the combined aspects.

    // Provided by VK_KHR_get_physical_device_properties2
void vkGetPhysicalDeviceSparseImageFormatProperties2KHR(
    VkPhysicalDevice                            physicalDevice,
    const VkPhysicalDeviceSparseImageFormatInfo2* pFormatInfo,
    uint32_t*                                   pPropertyCount,
    VkSparseImageFormatProperties2*             pProperties);

    • physicalDevice is the physical device from which to query the sparse image format properties.

    • pFormatInfo is a pointer to a VkPhysicalDeviceSparseImageFormatInfo2 structure containing input parameters to the command.

    • pPropertyCount is a pointer to an integer related to the number of sparse format properties available or queried, as described below.

    • pProperties is either NULL or a pointer to an array of VkSparseImageFormatProperties2 structures.

    vkGetPhysicalDeviceSparseImageFormatProperties2 behaves identically to vkGetPhysicalDeviceSparseImageFormatProperties, with the ability to return extended information by adding extending structures to the pNext chain of its pProperties parameter.

    Valid Usage (Implicit)

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties2-physicalDevice-parameter
      physicalDevice must be a valid VkPhysicalDevice handle

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties2-pFormatInfo-parameter
      pFormatInfo must be a valid pointer to a valid VkPhysicalDeviceSparseImageFormatInfo2 structure

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties2-pPropertyCount-parameter
      pPropertyCount must be a valid pointer to a uint32_t value

    • VUID-vkGetPhysicalDeviceSparseImageFormatProperties2-pProperties-parameter
      If the value referenced by pPropertyCount is not 0, and pProperties is not NULL, pProperties must be a valid pointer to an array of pPropertyCount VkSparseImageFormatProperties2 structures

    The VkPhysicalDeviceSparseImageFormatInfo2 structure is defined as:

    typedef struct VkPhysicalDeviceSparseImageFormatInfo2 {
    VkStructureType          sType;
    const void*              pNext;
    VkFormat                 format;
    VkImageType              type;
    VkSampleCountFlagBits    samples;
    VkImageUsageFlags        usage;
    VkImageTiling            tiling;
} VkPhysicalDeviceSparseImageFormatInfo2;

    or the equivalent

    // Provided by VK_KHR_get_physical_device_properties2
typedef VkPhysicalDeviceSparseImageFormatInfo2 VkPhysicalDeviceSparseImageFormatInfo2KHR;

    • sType is the type of this structure.

    • pNext is NULL or a pointer to a structure extending this structure.

    • format is the image format.

    • type is the dimensionality of image.

    • samples is a VkSampleCountFlagBits value specifying the number of samples per texel.

    • usage is a bitmask describing the intended usage of the image.

    • tiling is the tiling arrangement of the texel blocks in memory.

    Valid Usage

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-samples-01095
      samples must be a bit value that is set in VkImageFormatProperties::sampleCounts returned by vkGetPhysicalDeviceImageFormatProperties with format, type, tiling, and usage equal to those in this command and flags equal to the value that is set in VkImageCreateInfo::flags when the image is created

    Valid Usage (Implicit)

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-sType-sType
      sType must be VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SPARSE_IMAGE_FORMAT_INFO_2

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-pNext-pNext
      pNext must be NULL

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-format-parameter
      format must be a valid VkFormat value

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-type-parameter
      type must be a valid VkImageType value

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-samples-parameter
      samples must be a valid VkSampleCountFlagBits value

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-usage-parameter
      usage must be a valid combination of VkImageUsageFlagBits values

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-usage-requiredbitmask
      usage must not be 0

    • VUID-VkPhysicalDeviceSparseImageFormatInfo2-tiling-parameter
      tiling must be a valid VkImageTiling value

    The VkSparseImageFormatProperties2 structure is defined as:

    typedef struct VkSparseImageFormatProperties2 {
    VkStructureType                  sType;
    void*                            pNext;
    VkSparseImageFormatProperties    properties;
} VkSparseImageFormatProperties2;

    or the equivalent

    // Provided by VK_KHR_get_physical_device_properties2
typedef VkSparseImageFormatProperties2 VkSparseImageFormatProperties2KHR;
    Valid Usage (Implicit)

    • VUID-VkSparseImageFormatProperties2-sType-sType
      sType must be VK_STRUCTURE_TYPE_SPARSE_IMAGE_FORMAT_PROPERTIES_2

    • VUID-VkSparseImageFormatProperties2-pNext-pNext
      pNext must be NULL

    29.7.4. Sparse Resource Creation

    Sparse resources require that one or more sparse feature flags be specified (as part of the VkPhysicalDeviceFeatures structure described previously in the Physical Device Features section) when calling vkCreateDevice. When the appropriate device features are enabled, the VK_BUFFER_CREATE_SPARSE_* and VK_IMAGE_CREATE_SPARSE_* flags can be used. See vkCreateBuffer and vkCreateImage for details of the resource creation APIs.

    Note

    Specifying VK_BUFFER_CREATE_SPARSE_RESIDENCY_BIT or VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT requires specifying VK_BUFFER_CREATE_SPARSE_BINDING_BIT or VK_IMAGE_CREATE_SPARSE_BINDING_BIT, respectively, as well. This means that resources must be created with the appropriate *_SPARSE_BINDING_BIT to be used with the sparse binding command (vkQueueBindSparse).

    29.7.5. Sparse Resource Memory Requirements

    Sparse resources have specific memory requirements related to binding sparse memory. These memory requirements are reported differently for VkBuffer objects and VkImage objects.

    Buffer and Fully-Resident Images

    Buffers (both fully and partially resident) and fully-resident images can be bound to memory using only the data from VkMemoryRequirements. For all sparse resources the VkMemoryRequirements::alignment member specifies both the bindable sparse block size in bytes and required alignment of VkDeviceMemory.

    Partially Resident Images

    Partially resident images have a different method for binding memory. As with buffers and fully resident images, the VkMemoryRequirements::alignment field specifies the bindable sparse block size in bytes for the image.

    Requesting sparse memory requirements for VkImage objects using vkGetImageSparseMemoryRequirements will return an array of one or more VkSparseImageMemoryRequirements structures. Each structure describes the sparse memory requirements for a group of aspects of the image.

    The sparse image must have been created using the VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT flag to retrieve valid sparse image memory requirements.

    Sparse Image Memory Requirements

    The VkSparseImageMemoryRequirements structure is defined as:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseImageMemoryRequirements {
    VkSparseImageFormatProperties    formatProperties;
    uint32_t                         imageMipTailFirstLod;
    VkDeviceSize                     imageMipTailSize;
    VkDeviceSize                     imageMipTailOffset;
    VkDeviceSize                     imageMipTailStride;
} VkSparseImageMemoryRequirements;

    • formatProperties.aspectMask is the set of aspects of the image that this sparse memory requirement applies to. This will usually have a single aspect specified. However, depth/stencil images may have depth and stencil data interleaved in the same sparse block, in which case both VK_IMAGE_ASPECT_DEPTH_BIT and VK_IMAGE_ASPECT_STENCIL_BIT would be present.

    • formatProperties.imageGranularity describes the dimensions of a single bindable sparse image block in texel units. For aspect VK_IMAGE_ASPECT_METADATA_BIT, all dimensions will be zero. All metadata is located in the mip tail region.

    • formatProperties.flags is a bitmask of VkSparseImageFormatFlagBits:

      • If VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT is set the image uses a single mip tail region for all array layers.

      • If VK_SPARSE_IMAGE_FORMAT_ALIGNED_MIP_SIZE_BIT is set the dimensions of mip levels must be integer multiples of the corresponding dimensions of the sparse image block for levels not located in the mip tail.

      • If VK_SPARSE_IMAGE_FORMAT_NONSTANDARD_BLOCK_SIZE_BIT is set the image uses non-standard sparse image block dimensions. The formatProperties.imageGranularity values do not match the standard sparse image block dimension corresponding to the image’s format.

    • imageMipTailFirstLod is the first mip level at which image subresources are included in the mip tail region.

    • imageMipTailSize is the memory size (in bytes) of the mip tail region. If formatProperties.flags contains VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT, this is the size of the whole mip tail, otherwise this is the size of the mip tail of a single array layer. This value is guaranteed to be a multiple of the sparse block size in bytes.

    • imageMipTailOffset is the opaque memory offset used with VkSparseImageOpaqueMemoryBindInfo to bind the mip tail region(s).

    • imageMipTailStride is the offset stride between each array-layer’s mip tail, if formatProperties.flags does not contain VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT (otherwise the value is undefined).

    To query sparse memory requirements for an image, call:

    // Provided by VK_VERSION_1_0
void vkGetImageSparseMemoryRequirements(
    VkDevice                                    device,
    VkImage                                     image,
    uint32_t*                                   pSparseMemoryRequirementCount,
    VkSparseImageMemoryRequirements*            pSparseMemoryRequirements);

    • device is the logical device that owns the image.

    • image is the VkImage object to get the memory requirements for.

    • pSparseMemoryRequirementCount is a pointer to an integer related to the number of sparse memory requirements available or queried, as described below.

    • pSparseMemoryRequirements is either NULL or a pointer to an array of VkSparseImageMemoryRequirements structures.

    If pSparseMemoryRequirements is NULL, then the number of sparse memory requirements available is returned in pSparseMemoryRequirementCount. Otherwise, pSparseMemoryRequirementCount must point to a variable set by the user to the number of elements in the pSparseMemoryRequirements array, and on return the variable is overwritten with the number of structures actually written to pSparseMemoryRequirements. If pSparseMemoryRequirementCount is less than the number of sparse memory requirements available, at most pSparseMemoryRequirementCount structures will be written.

    If the image was not created with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT then pSparseMemoryRequirementCount will be set to zero and pSparseMemoryRequirements will not be written to.

    Note

    It is legal for an implementation to report a larger value in VkMemoryRequirements::size than would be obtained by adding together memory sizes for all VkSparseImageMemoryRequirements returned by vkGetImageSparseMemoryRequirements. This may occur when the implementation requires unused padding in the address range describing the resource.
    Valid Usage (Implicit)

    • VUID-vkGetImageSparseMemoryRequirements-device-parameter
      device must be a valid VkDevice handle

    • VUID-vkGetImageSparseMemoryRequirements-image-parameter
      image must be a valid VkImage handle

    • VUID-vkGetImageSparseMemoryRequirements-pSparseMemoryRequirementCount-parameter
      pSparseMemoryRequirementCount must be a valid pointer to a uint32_t value

    • VUID-vkGetImageSparseMemoryRequirements-pSparseMemoryRequirements-parameter
      If the value referenced by pSparseMemoryRequirementCount is not 0, and pSparseMemoryRequirements is not NULL, pSparseMemoryRequirements must be a valid pointer to an array of pSparseMemoryRequirementCount VkSparseImageMemoryRequirements structures

    • VUID-vkGetImageSparseMemoryRequirements-image-parent
      image must have been created, allocated, or retrieved from device

    To query sparse memory requirements for an image, call:

    // Provided by VK_KHR_get_memory_requirements2
void vkGetImageSparseMemoryRequirements2KHR(
    VkDevice                                    device,
    const VkImageSparseMemoryRequirementsInfo2* pInfo,
    uint32_t*                                   pSparseMemoryRequirementCount,
    VkSparseImageMemoryRequirements2*           pSparseMemoryRequirements);

    • device is the logical device that owns the image.

    • pInfo is a pointer to a VkImageSparseMemoryRequirementsInfo2 structure containing parameters required for the memory requirements query.

    • pSparseMemoryRequirementCount is a pointer to an integer related to the number of sparse memory requirements available or queried, as described below.

    • pSparseMemoryRequirements is either NULL or a pointer to an array of VkSparseImageMemoryRequirements2 structures.

    Valid Usage (Implicit)

    • VUID-vkGetImageSparseMemoryRequirements2-device-parameter
      device must be a valid VkDevice handle

    • VUID-vkGetImageSparseMemoryRequirements2-pInfo-parameter
      pInfo must be a valid pointer to a valid VkImageSparseMemoryRequirementsInfo2 structure

    • VUID-vkGetImageSparseMemoryRequirements2-pSparseMemoryRequirementCount-parameter
      pSparseMemoryRequirementCount must be a valid pointer to a uint32_t value

    • VUID-vkGetImageSparseMemoryRequirements2-pSparseMemoryRequirements-parameter
      If the value referenced by pSparseMemoryRequirementCount is not 0, and pSparseMemoryRequirements is not NULL, pSparseMemoryRequirements must be a valid pointer to an array of pSparseMemoryRequirementCount VkSparseImageMemoryRequirements2 structures

    The VkImageSparseMemoryRequirementsInfo2 structure is defined as:

    typedef struct VkImageSparseMemoryRequirementsInfo2 {
    VkStructureType    sType;
    const void*        pNext;
    VkImage            image;
} VkImageSparseMemoryRequirementsInfo2;

    or the equivalent

    // Provided by VK_KHR_get_memory_requirements2
typedef VkImageSparseMemoryRequirementsInfo2 VkImageSparseMemoryRequirementsInfo2KHR;

    • sType is the type of this structure.

    • pNext is NULL or a pointer to a structure extending this structure.

    • image is the image to query.

    Valid Usage (Implicit)

    • VUID-VkImageSparseMemoryRequirementsInfo2-sType-sType
      sType must be VK_STRUCTURE_TYPE_IMAGE_SPARSE_MEMORY_REQUIREMENTS_INFO_2

    • VUID-VkImageSparseMemoryRequirementsInfo2-pNext-pNext
      pNext must be NULL

    • VUID-VkImageSparseMemoryRequirementsInfo2-image-parameter
      image must be a valid VkImage handle

    The VkSparseImageMemoryRequirements2 structure is defined as:

    typedef struct VkSparseImageMemoryRequirements2 {
    VkStructureType                    sType;
    void*                              pNext;
    VkSparseImageMemoryRequirements    memoryRequirements;
} VkSparseImageMemoryRequirements2;

    or the equivalent

    // Provided by VK_KHR_get_memory_requirements2
typedef VkSparseImageMemoryRequirements2 VkSparseImageMemoryRequirements2KHR;

    • sType is the type of this structure.

    • pNext is NULL or a pointer to a structure extending this structure.

    • memoryRequirements is a VkSparseImageMemoryRequirements structure describing the memory requirements of the sparse image.

    Valid Usage (Implicit)

    • VUID-VkSparseImageMemoryRequirements2-sType-sType
      sType must be VK_STRUCTURE_TYPE_SPARSE_IMAGE_MEMORY_REQUIREMENTS_2

    • VUID-VkSparseImageMemoryRequirements2-pNext-pNext
      pNext must be NULL

    29.7.6. Binding Resource Memory

    Non-sparse resources are backed by a single physical allocation prior to device use (via vkBindImageMemory or vkBindBufferMemory), and their backing must not be changed. On the other hand, sparse resources can be bound to memory non-contiguously and these bindings can be altered during the lifetime of the resource.

    Note

    It is important to note that freeing a VkDeviceMemory object with vkFreeMemory will not cause resources (or resource regions) bound to the memory object to become unbound. Applications must not access resources bound to memory that has been freed.

    Sparse memory bindings execute on a queue that includes the VK_QUEUE_SPARSE_BINDING_BIT bit. Applications must use synchronization primitives to guarantee that other queues do not access ranges of memory concurrently with a binding change. Applications can access other ranges of the same resource while a bind operation is executing.

    Note

    Implementations must provide a guarantee that simultaneously binding sparse blocks while another queue accesses those same sparse blocks via a sparse resource must not access memory owned by another process or otherwise corrupt the system.

    While some implementations may include VK_QUEUE_SPARSE_BINDING_BIT support in queue families that also include graphics and compute support, other implementations may only expose a VK_QUEUE_SPARSE_BINDING_BIT-only queue family. In either case, applications must use synchronization primitives to explicitly request any ordering dependencies between sparse memory binding operations and other graphics/compute/transfer operations, as sparse binding operations are not automatically ordered against command buffer execution, even within a single queue.

    When binding memory explicitly for the VK_IMAGE_ASPECT_METADATA_BIT the application must use the VK_SPARSE_MEMORY_BIND_METADATA_BIT in the VkSparseMemoryBind::flags field when binding memory. Binding memory for metadata is done the same way as binding memory for the mip tail, with the addition of the VK_SPARSE_MEMORY_BIND_METADATA_BIT flag.

    Binding the mip tail for any aspect must only be performed using VkSparseImageOpaqueMemoryBindInfo. If formatProperties.flags contains VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT, then it can be bound with a single VkSparseMemoryBind structure, with resourceOffset = imageMipTailOffset and size = imageMipTailSize.

    If formatProperties.flags does not contain VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT then the offset for the mip tail in each array layer is given as:

    arrayMipTailOffset = imageMipTailOffset + arrayLayer * imageMipTailStride;

    and the mip tail can be bound with layerCount VkSparseMemoryBind structures, each using size = imageMipTailSize and resourceOffset = arrayMipTailOffset as defined above.

    Sparse memory binding is handled by the following APIs and related data structures.

    Sparse Memory Binding Functions

    The VkSparseMemoryBind structure is defined as:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseMemoryBind {
    VkDeviceSize               resourceOffset;
    VkDeviceSize               size;
    VkDeviceMemory             memory;
    VkDeviceSize               memoryOffset;
    VkSparseMemoryBindFlags    flags;
} VkSparseMemoryBind;

    • resourceOffset is the offset into the resource.

    • size is the size of the memory region to be bound.

    • memory is the VkDeviceMemory object that the range of the resource is bound to. If memory is VK_NULL_HANDLE, the range is unbound.

    • memoryOffset is the offset into the VkDeviceMemory object to bind the resource range to. If memory is VK_NULL_HANDLE, this value is ignored.

    • flags is a bitmask of VkSparseMemoryBindFlagBits specifying usage of the binding operation.

    The binding range [resourceOffset, resourceOffset + size) has different constraints based on flags. If flags contains VK_SPARSE_MEMORY_BIND_METADATA_BIT, the binding range must be within the mip tail region of the metadata aspect. This metadata region is defined by:

    metadataRegion = [base, base + imageMipTailSize)

    base = imageMipTailOffset + imageMipTailStride × n

    and imageMipTailOffset, imageMipTailSize, and imageMipTailStride values are from the VkSparseImageMemoryRequirements corresponding to the metadata aspect of the image, and n is a valid array layer index for the image,

    imageMipTailStride is considered to be zero for aspects where VkSparseImageMemoryRequirements::formatProperties.flags contains VK_SPARSE_IMAGE_FORMAT_SINGLE_MIPTAIL_BIT.

    If flags does not contain VK_SPARSE_MEMORY_BIND_METADATA_BIT, the binding range must be within the range [0,VkMemoryRequirements::size).

    Valid Usage

    • VUID-VkSparseMemoryBind-memory-01096
      If memory is not VK_NULL_HANDLE, memory and memoryOffset must match the memory requirements of the resource, as described in section Resource Memory Association

    • VUID-VkSparseMemoryBind-memory-01097
      If memory is not VK_NULL_HANDLE, memory must not have been created with a memory type that reports VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT bit set

    • VUID-VkSparseMemoryBind-size-01098
      size must be greater than 0

    • VUID-VkSparseMemoryBind-resourceOffset-01099
      resourceOffset must be less than the size of the resource

    • VUID-VkSparseMemoryBind-size-01100
      size must be less than or equal to the size of the resource minus resourceOffset

    • VUID-VkSparseMemoryBind-memoryOffset-01101
      memoryOffset must be less than the size of memory

    • VUID-VkSparseMemoryBind-size-01102
      size must be less than or equal to the size of memory minus memoryOffset

    • VUID-VkSparseMemoryBind-memory-02730
      If memory was created with VkExportMemoryAllocateInfo::handleTypes not equal to 0, at least one handle type it contained must also have been set in VkExternalMemoryBufferCreateInfo::handleTypes or VkExternalMemoryImageCreateInfo::handleTypes when the resource was created

    • VUID-VkSparseMemoryBind-memory-02731
      If memory was created by a memory import operation, the external handle type of the imported memory must also have been set in VkExternalMemoryBufferCreateInfo::handleTypes or VkExternalMemoryImageCreateInfo::handleTypes when the resource was created

    Valid Usage (Implicit)

    Bits which can be set in VkSparseMemoryBind::flags, specifying usage of a sparse memory binding operation, are:

    // Provided by VK_VERSION_1_0
typedef enum VkSparseMemoryBindFlagBits {
    VK_SPARSE_MEMORY_BIND_METADATA_BIT = 0x00000001,
} VkSparseMemoryBindFlagBits;

    • VK_SPARSE_MEMORY_BIND_METADATA_BIT specifies that the memory being bound is only for the metadata aspect.

    // Provided by VK_VERSION_1_0
typedef VkFlags VkSparseMemoryBindFlags;

    VkSparseMemoryBindFlags is a bitmask type for setting a mask of zero or more VkSparseMemoryBindFlagBits.

    Memory is bound to VkBuffer objects created with the VK_BUFFER_CREATE_SPARSE_BINDING_BIT flag using the following structure:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseBufferMemoryBindInfo {
    VkBuffer                     buffer;
    uint32_t                     bindCount;
    const VkSparseMemoryBind*    pBinds;
} VkSparseBufferMemoryBindInfo;
    Valid Usage (Implicit)

    • VUID-VkSparseBufferMemoryBindInfo-buffer-parameter
      buffer must be a valid VkBuffer handle

    • VUID-VkSparseBufferMemoryBindInfo-pBinds-parameter
      pBinds must be a valid pointer to an array of bindCount valid VkSparseMemoryBind structures

    • VUID-VkSparseBufferMemoryBindInfo-bindCount-arraylength
      bindCount must be greater than 0

    Memory is bound to opaque regions of VkImage objects created with the VK_IMAGE_CREATE_SPARSE_BINDING_BIT flag using the following structure:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseImageOpaqueMemoryBindInfo {
    VkImage                      image;
    uint32_t                     bindCount;
    const VkSparseMemoryBind*    pBinds;
} VkSparseImageOpaqueMemoryBindInfo;
    Valid Usage

    • VUID-VkSparseImageOpaqueMemoryBindInfo-pBinds-01103
      If the flags member of any element of pBinds contains VK_SPARSE_MEMORY_BIND_METADATA_BIT, the binding range defined must be within the mip tail region of the metadata aspect of image

    Valid Usage (Implicit)

    • VUID-VkSparseImageOpaqueMemoryBindInfo-image-parameter
      image must be a valid VkImage handle

    • VUID-VkSparseImageOpaqueMemoryBindInfo-pBinds-parameter
      pBinds must be a valid pointer to an array of bindCount valid VkSparseMemoryBind structures

    • VUID-VkSparseImageOpaqueMemoryBindInfo-bindCount-arraylength
      bindCount must be greater than 0

    Note

    This operation is normally used to bind memory to fully-resident sparse images or for mip tail regions of partially resident images. However, it can also be used to bind memory for the entire binding range of partially resident images.

    In case flags does not contain VK_SPARSE_MEMORY_BIND_METADATA_BIT, the resourceOffset is in the range [0, VkMemoryRequirements::size), This range includes data from all aspects of the image, including metadata. For most implementations this will probably mean that the resourceOffset is a simple device address offset within the resource. It is possible for an application to bind a range of memory that includes both resource data and metadata. However, the application would not know what part of the image the memory is used for, or if any range is being used for metadata.

    When flags contains VK_SPARSE_MEMORY_BIND_METADATA_BIT, the binding range specified must be within the mip tail region of the metadata aspect. In this case the resourceOffset is not required to be a simple device address offset within the resource. However, it is defined to be within [imageMipTailOffset, imageMipTailOffset + imageMipTailSize) for the metadata aspect. See VkSparseMemoryBind for the full constraints on binding region with this flag present.

    Memory can be bound to sparse image blocks of VkImage objects created with the VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT flag using the following structure:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseImageMemoryBindInfo {
    VkImage                           image;
    uint32_t                          bindCount;
    const VkSparseImageMemoryBind*    pBinds;
} VkSparseImageMemoryBindInfo;
    Valid Usage

    • VUID-VkSparseImageMemoryBindInfo-subresource-01722
      The subresource.mipLevel member of each element of pBinds must be less than the mipLevels specified in VkImageCreateInfo when image was created

    • VUID-VkSparseImageMemoryBindInfo-subresource-01723
      The subresource.arrayLayer member of each element of pBinds must be less than the arrayLayers specified in VkImageCreateInfo when image was created

    • VUID-VkSparseImageMemoryBindInfo-image-02901
      image must have been created with VK_IMAGE_CREATE_SPARSE_RESIDENCY_BIT set

    Valid Usage (Implicit)

    • VUID-VkSparseImageMemoryBindInfo-image-parameter
      image must be a valid VkImage handle

    • VUID-VkSparseImageMemoryBindInfo-pBinds-parameter
      pBinds must be a valid pointer to an array of bindCount valid VkSparseImageMemoryBind structures

    • VUID-VkSparseImageMemoryBindInfo-bindCount-arraylength
      bindCount must be greater than 0

    The VkSparseImageMemoryBind structure is defined as:

    // Provided by VK_VERSION_1_0
typedef struct VkSparseImageMemoryBind {
    VkImageSubresource         subresource;
    VkOffset3D                 offset;
    VkExtent3D                 extent;
    VkDeviceMemory             memory;
    VkDeviceSize               memoryOffset;
    VkSparseMemoryBindFlags    flags;
} VkSparseImageMemoryBind;

    • subresource is the image aspect and region of interest in the image.

    • offset are the coordinates of the first texel within the image subresource to bind.

    • extent is the size in texels of the region within the image subresource to bind. The extent must be a multiple of the sparse image block dimensions, except when binding sparse image blocks along the edge of an image subresource it can instead be such that any coordinate of offset + extent equals the corresponding dimensions of the image subresource.

    • memory is the VkDeviceMemory object that the sparse image blocks of the image are bound to. If memory is VK_NULL_HANDLE, the sparse image blocks are unbound.

    • memoryOffset is an offset into VkDeviceMemory object. If memory is VK_NULL_HANDLE, this value is ignored.

    • flags are sparse memory binding flags.

    Valid Usage

    • VUID-VkSparseImageMemoryBind-memory-01104
      If the sparse aliased residency feature is not enabled, and if any other resources are bound to ranges of memory, the range of memory being bound must not overlap with those bound ranges

    • VUID-VkSparseImageMemoryBind-memory-01105
      memory and memoryOffset must match the memory requirements of the calling command’s image, as described in section Resource Memory Association

    • VUID-VkSparseImageMemoryBind-subresource-01106
      subresource must be a valid image subresource for image (see Image Views)

    • VUID-VkSparseImageMemoryBind-offset-01107
      offset.x must be a multiple of the sparse image block width (VkSparseImageFormatProperties::imageGranularity.width) of the image

    • VUID-VkSparseImageMemoryBind-extent-01108
      extent.width must either be a multiple of the sparse image block width of the image, or else (extent.width + offset.x) must equal the width of the image subresource

    • VUID-VkSparseImageMemoryBind-offset-01109
      offset.y must be a multiple of the sparse image block height (VkSparseImageFormatProperties::imageGranularity.height) of the image

    • VUID-VkSparseImageMemoryBind-extent-01110
      extent.height must either be a multiple of the sparse image block height of the image, or else (extent.height + offset.y) must equal the height of the image subresource

    • VUID-VkSparseImageMemoryBind-offset-01111
      offset.z must be a multiple of the sparse image block depth (VkSparseImageFormatProperties::imageGranularity.depth) of the image

    • VUID-VkSparseImageMemoryBind-extent-01112
      extent.depth must either be a multiple of the sparse image block depth of the image, or else (extent.depth + offset.z) must equal the depth of the image subresource

    • VUID-VkSparseImageMemoryBind-memory-02732
      If memory was created with VkExportMemoryAllocateInfo::handleTypes not equal to 0, at least one handle type it contained must also have been set in VkExternalMemoryImageCreateInfo::handleTypes when the image was created

    • VUID-VkSparseImageMemoryBind-memory-02733
      If memory was created by a memory import operation, the external handle type of the imported memory must also have been set in VkExternalMemoryImageCreateInfo::handleTypes when image was created

    Valid Usage (Implicit)

    To submit sparse binding operations to a queue, call:

    // Provided by VK_VERSION_1_0
VkResult vkQueueBindSparse(
    VkQueue                                     queue,
    uint32_t                                    bindInfoCount,
    const VkBindSparseInfo*                     pBindInfo,
    VkFence                                     fence);

    • queue is the queue that the sparse binding operations will be submitted to.

    • bindInfoCount is the number of elements in the pBindInfo array.

    • pBindInfo is a pointer to an array of VkBindSparseInfo structures, each specifying a sparse binding submission batch.

    • fence is an optional handle to a fence to be signaled. If fence is not VK_NULL_HANDLE, it defines a fence signal operation.

    vkQueueBindSparse is a queue submission command, with each batch defined by an element of pBindInfo as a VkBindSparseInfo structure. Batches begin execution in the order they appear in pBindInfo, but may complete out of order.

    Within a batch, a given range of a resource must not be bound more than once. Across batches, if a range is to be bound to one allocation and offset and then to another allocation and offset, then the application must guarantee (usually using semaphores) that the binding operations are executed in the correct order, as well as to order binding operations against the execution of command buffer submissions.

    As no operation to vkQueueBindSparse causes any pipeline stage to access memory, synchronization primitives used in this command effectively only define execution dependencies.

    Additional information about fence and semaphore operation is described in the synchronization chapter.

    Valid Usage

    • VUID-vkQueueBindSparse-fence-01113
      If fence is not VK_NULL_HANDLE, fence must be unsignaled

    • VUID-vkQueueBindSparse-fence-01114
      If fence is not VK_NULL_HANDLE, fence must not be associated with any other queue command that has not yet completed execution on that queue

    • VUID-vkQueueBindSparse-pSignalSemaphores-01115
      Each element of the pSignalSemaphores member of each element of pBindInfo must be unsignaled when the semaphore signal operation it defines is executed on the device

    • VUID-vkQueueBindSparse-pWaitSemaphores-01116
      When a semaphore wait operation referring to a binary semaphore defined by any element of the pWaitSemaphores member of any element of pBindInfo executes on queue, there must be no other queues waiting on the same semaphore

    • VUID-vkQueueBindSparse-pWaitSemaphores-01117
      All elements of the pWaitSemaphores member of all elements of the pBindInfo parameter referring to a binary semaphore must be semaphores that are signaled, or have semaphore signal operations previously submitted for execution

    • VUID-vkQueueBindSparse-pWaitSemaphores-03245
      All elements of the pWaitSemaphores member of all elements of pBindInfo created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_BINARY must reference a semaphore signal operation that has been submitted for execution and any semaphore signal operations on which it depends (if any) must have also been submitted for execution

    Valid Usage (Implicit)

    • VUID-vkQueueBindSparse-queue-parameter
      queue must be a valid VkQueue handle

    • VUID-vkQueueBindSparse-pBindInfo-parameter
      If bindInfoCount is not 0, pBindInfo must be a valid pointer to an array of bindInfoCount valid VkBindSparseInfo structures

    • VUID-vkQueueBindSparse-fence-parameter
      If fence is not VK_NULL_HANDLE, fence must be a valid VkFence handle

    • VUID-vkQueueBindSparse-queuetype
      The queue must support sparse binding operations

    • VUID-vkQueueBindSparse-commonparent
      Both of fence, and queue that are valid handles of non-ignored parameters must have been created, allocated, or retrieved from the same VkDevice

    Host Synchronization

    • Host access to queue must be externally synchronized

    • Host access to pBindInfo[].pBufferBinds[].buffer must be externally synchronized

    • Host access to pBindInfo[].pImageOpaqueBinds[].image must be externally synchronized

    • Host access to pBindInfo[].pImageBinds[].image must be externally synchronized

    • Host access to fence must be externally synchronized

    Command Properties
    Command Buffer Levels Render Pass Scope Supported Queue Types Pipeline Type

    -

    -

    SPARSE_BINDING

    -
    Return Codes
    Success

    • VK_SUCCESS

    Failure

    • VK_ERROR_OUT_OF_HOST_MEMORY

    • VK_ERROR_OUT_OF_DEVICE_MEMORY

    • VK_ERROR_DEVICE_LOST

    The VkBindSparseInfo structure is defined as:

    // Provided by VK_VERSION_1_0
typedef struct VkBindSparseInfo {
    VkStructureType                             sType;
    const void*                                 pNext;
    uint32_t                                    waitSemaphoreCount;
    const VkSemaphore*                          pWaitSemaphores;
    uint32_t                                    bufferBindCount;
    const VkSparseBufferMemoryBindInfo*         pBufferBinds;
    uint32_t                                    imageOpaqueBindCount;
    const VkSparseImageOpaqueMemoryBindInfo*    pImageOpaqueBinds;
    uint32_t                                    imageBindCount;
    const VkSparseImageMemoryBindInfo*          pImageBinds;
    uint32_t                                    signalSemaphoreCount;
    const VkSemaphore*                          pSignalSemaphores;
} VkBindSparseInfo;

    • sType is the type of this structure.

    • pNext is NULL or a pointer to a structure extending this structure.

    • waitSemaphoreCount is the number of semaphores upon which to wait before executing the sparse binding operations for the batch.

    • pWaitSemaphores is a pointer to an array of semaphores upon which to wait on before the sparse binding operations for this batch begin execution. If semaphores to wait on are provided, they define a semaphore wait operation.

    • bufferBindCount is the number of sparse buffer bindings to perform in the batch.

    • pBufferBinds is a pointer to an array of VkSparseBufferMemoryBindInfo structures.

    • imageOpaqueBindCount is the number of opaque sparse image bindings to perform.

    • pImageOpaqueBinds is a pointer to an array of VkSparseImageOpaqueMemoryBindInfo structures, indicating opaque sparse image bindings to perform.

    • imageBindCount is the number of sparse image bindings to perform.

    • pImageBinds is a pointer to an array of VkSparseImageMemoryBindInfo structures, indicating sparse image bindings to perform.

    • signalSemaphoreCount is the number of semaphores to be signaled once the sparse binding operations specified by the structure have completed execution.

    • pSignalSemaphores is a pointer to an array of semaphores which will be signaled when the sparse binding operations for this batch have completed execution. If semaphores to be signaled are provided, they define a semaphore signal operation.

    Valid Usage

    • VUID-VkBindSparseInfo-pWaitSemaphores-03246
      If any element of pWaitSemaphores or pSignalSemaphores was created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE then the pNext chain must include a VkTimelineSemaphoreSubmitInfo structure

    • VUID-VkBindSparseInfo-pNext-03247
      If the pNext chain of this structure includes a VkTimelineSemaphoreSubmitInfo structure and any element of pWaitSemaphores was created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE then its waitSemaphoreValueCount member must equal waitSemaphoreCount

    • VUID-VkBindSparseInfo-pNext-03248
      If the pNext chain of this structure includes a VkTimelineSemaphoreSubmitInfo structure and any element of pSignalSemaphores was created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE then its signalSemaphoreValueCount member must equal signalSemaphoreCount

    • VUID-VkBindSparseInfo-pSignalSemaphores-03249
      For each element of pSignalSemaphores created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE the corresponding element of VkTimelineSemaphoreSubmitInfo::pSignalSemaphoreValues must have a value greater than the current value of the semaphore when the semaphore signal operation is executed

    • VUID-VkBindSparseInfo-pWaitSemaphores-03250
      For each element of pWaitSemaphores created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE the corresponding element of VkTimelineSemaphoreSubmitInfo::pWaitSemaphoreValues must have a value which does not differ from the current value of the semaphore or from the value of any outstanding semaphore wait or signal operation on that semaphore by more than maxTimelineSemaphoreValueDifference

    • VUID-VkBindSparseInfo-pSignalSemaphores-03251
      For each element of pSignalSemaphores created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE the corresponding element of VkTimelineSemaphoreSubmitInfo::pSignalSemaphoreValues must have a value which does not differ from the current value of the semaphore or from the value of any outstanding semaphore wait or signal operation on that semaphore by more than maxTimelineSemaphoreValueDifference

    Valid Usage (Implicit)

    • VUID-VkBindSparseInfo-sType-sType
      sType must be VK_STRUCTURE_TYPE_BIND_SPARSE_INFO

    • VUID-VkBindSparseInfo-pNext-pNext
      Each pNext member of any structure (including this one) in the pNext chain must be either NULL or a pointer to a valid instance of VkDeviceGroupBindSparseInfo or VkTimelineSemaphoreSubmitInfo

    • VUID-VkBindSparseInfo-sType-unique
      The sType value of each struct in the pNext chain must be unique

    • VUID-VkBindSparseInfo-pWaitSemaphores-parameter
      If waitSemaphoreCount is not 0, pWaitSemaphores must be a valid pointer to an array of waitSemaphoreCount valid VkSemaphore handles

    • VUID-VkBindSparseInfo-pBufferBinds-parameter
      If bufferBindCount is not 0, pBufferBinds must be a valid pointer to an array of bufferBindCount valid VkSparseBufferMemoryBindInfo structures

    • VUID-VkBindSparseInfo-pImageOpaqueBinds-parameter
      If imageOpaqueBindCount is not 0, pImageOpaqueBinds must be a valid pointer to an array of imageOpaqueBindCount valid VkSparseImageOpaqueMemoryBindInfo structures

    • VUID-VkBindSparseInfo-pImageBinds-parameter
      If imageBindCount is not 0, pImageBinds must be a valid pointer to an array of imageBindCount valid VkSparseImageMemoryBindInfo structures

    • VUID-VkBindSparseInfo-pSignalSemaphores-parameter
      If signalSemaphoreCount is not 0, pSignalSemaphores must be a valid pointer to an array of signalSemaphoreCount valid VkSemaphore handles

    • VUID-VkBindSparseInfo-commonparent
      Both of the elements of pSignalSemaphores, and the elements of pWaitSemaphores that are valid handles of non-ignored parameters must have been created, allocated, or retrieved from the same VkDevice

    To specify the values to use when waiting for and signaling semaphores created with a VkSemaphoreType of VK_SEMAPHORE_TYPE_TIMELINE, add a VkTimelineSemaphoreSubmitInfo structure to the pNext chain of the VkBindSparseInfo structure.

    If the pNext chain of VkBindSparseInfo includes a VkDeviceGroupBindSparseInfo structure, then that structure includes device indices specifying which instance of the resources and memory are bound.

    The VkDeviceGroupBindSparseInfo structure is defined as:

    typedef struct VkDeviceGroupBindSparseInfo {
    VkStructureType    sType;
    const void*        pNext;
    uint32_t           resourceDeviceIndex;
    uint32_t           memoryDeviceIndex;
} VkDeviceGroupBindSparseInfo;

    or the equivalent

    // Provided by VK_KHR_device_group
typedef VkDeviceGroupBindSparseInfo VkDeviceGroupBindSparseInfoKHR;

    • sType is the type of this structure.

    • pNext is NULL or a pointer to a structure extending this structure.

    • resourceDeviceIndex is a device index indicating which instance of the resource is bound.

    • memoryDeviceIndex is a device index indicating which instance of the memory the resource instance is bound to.

    These device indices apply to all buffer and image memory binds included in the batch pointing to this structure. The semaphore waits and signals for the batch are executed only by the physical device specified by the resourceDeviceIndex.

    If this structure is not present, resourceDeviceIndex and memoryDeviceIndex are assumed to be zero.

    Valid Usage

    • VUID-VkDeviceGroupBindSparseInfo-resourceDeviceIndex-01118
      resourceDeviceIndex and memoryDeviceIndex must both be valid device indices

    • VUID-VkDeviceGroupBindSparseInfo-memoryDeviceIndex-01119
      Each memory allocation bound in this batch must have allocated an instance for memoryDeviceIndex

    Valid Usage (Implicit)

    • VUID-VkDeviceGroupBindSparseInfo-sType-sType
      sType must be VK_STRUCTURE_TYPE_DEVICE_GROUP_BIND_SPARSE_INFO