# Vulkan® 1.4.350 - A Specification (with all registered extensions)

The Khronos® Vulkan Working Group
version 1.4.350, 2026-05-13 16:39:32Z
from git branch: makepkg commit: 81b1d516cbf42f04a3c7f781977c499945b5e5dc

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## 16. Descriptor Heaps

When the `descriptorHeap` feature is enabled, applications can use descriptor heaps to specify the descriptors that they will be accessing from shaders. Descriptor heaps are not objects, rather they are state that is bound to a command buffer indicating the device address of descriptors that can be accessed from a shader. There are two heaps available to the application - the sampler heap and the resource heap. The sampler heap contains sampler descriptors, the resource heap contains image, acceleration structure, tensor, and buffer descriptors.

### 16.1. Writing Descriptors

Descriptors can be obtained for the different heaps with commands that write descriptors to a host address, with the application responsible for transferring those descriptors into device memory for access via heaps.

To write sampler descriptors to memory, call:

    // Provided by VK_EXT_descriptor_heap
    VkResult vkWriteSamplerDescriptorsEXT(
        VkDevice                                    device,
        uint32_t                                    samplerCount,
        const VkSamplerCreateInfo*                  pSamplers,
        const VkHostAddressRangeEXT*                pDescriptors);

- `device` is the logical device that the descriptors are for.

- `samplerCount` is the number of elements in `pSamplers` and `pDescriptors`.

- `pSamplers` is a pointer to an array of VkSamplerCreateInfo structures defining properties of the sampler descriptors that will be written.

- `pDescriptors` is a pointer to an array of VkHostAddressRangeEXT structures defining the host address ranges that will be written to for each descriptor.

Each descriptor will be written to `pDescriptors`[i].`address` where i is the index of its create info in `pSamplers`.

Descriptors written using a fully identical VkSamplerCreateInfo structure on the same VkDevice will always return the same bit pattern. If the descriptorHeapCaptureReplay feature is enabled, descriptors written using a fully identical VkSamplerCreateInfo structure on a VkDevice created from the same VkPhysicalDevice with identical parameters will always return the same bit pattern.

Note | YCBCR samplers must be embedded in a shader by using VkShaderDescriptorSetAndBindingMappingInfoEXT, they cannot be specified here.

Valid Usage

- VUID-vkWriteSamplerDescriptorsEXT-descriptorHeap-11202
  The `descriptorHeap` feature must be enabled

- VUID-vkWriteSamplerDescriptorsEXT-size-11203
  The `size` member of each element of `pDescriptors` must be greater than or equal to the value returned by vkGetPhysicalDeviceDescriptorSizeEXT with a `descriptorType` equal to VK_DESCRIPTOR_TYPE_SAMPLER

- VUID-vkWriteSamplerDescriptorsEXT-pSamplers-11204
  Elements of `pSamplers` must not include VkSamplerYcbcrConversionInfo structures in their `pNext` chains

- VUID-vkWriteSamplerDescriptorsEXT-borderColor-11444
  If the `borderColor` of any element of `pSamplers` is VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT, VkSamplerCustomBorderColorIndexCreateInfoEXT must be included in the `pNext` chain of that element

- VUID-vkWriteSamplerDescriptorsEXT-borderColor-11205
  If the `borderColor` of any element of `pSamplers` is VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT, VkSamplerCustomBorderColorIndexCreateInfoEXT::`index` must be a value less than `maxCustomBorderColorSamplers`

- VUID-vkWriteSamplerDescriptorsEXT-pNext-11400
  If there is a VkDebugUtilsObjectNameInfoEXT structure in the `pNext` chain of any element of `pSamplers`, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

Valid Usage (Implicit)

- VUID-vkWriteSamplerDescriptorsEXT-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkWriteSamplerDescriptorsEXT-pSamplers-parameter
  `pSamplers` must be a valid pointer to an array of `samplerCount` valid VkSamplerCreateInfo structures

- VUID-vkWriteSamplerDescriptorsEXT-pDescriptors-parameter
  `pDescriptors` must be a valid pointer to an array of `samplerCount` valid VkHostAddressRangeEXT structures

- VUID-vkWriteSamplerDescriptorsEXT-samplerCount-arraylength
  `samplerCount` must be greater than `0`

Return Codes

Success

  - VK_SUCCESS

Failure

  - VK_ERROR_OUT_OF_DEVICE_MEMORY

  - VK_ERROR_OUT_OF_HOST_MEMORY

  - VK_ERROR_UNKNOWN

  - VK_ERROR_VALIDATION_FAILED

To write resource descriptors to memory, call:

    // Provided by VK_EXT_descriptor_heap
    VkResult vkWriteResourceDescriptorsEXT(
        VkDevice                                    device,
        uint32_t                                    resourceCount,
        const VkResourceDescriptorInfoEXT*          pResources,
        const VkHostAddressRangeEXT*                pDescriptors);

- `device` is the logical device that the descriptors are for.

- `resourceCount` is the number of elements in `pResources` and `pDescriptors`.

- `pResources` is a pointer to an array of VkResourceDescriptorInfoEXT structures defining properties of the resource descriptors that will be written.

- `pDescriptors` is a pointer to an array of VkHostAddressRangeEXT structures defining the host address ranges that will be written to for each descriptor.

Each descriptor will be written to `pDescriptors`[i].address where i is the index of its create info in `pResources`.

If any image descriptor written by this command includes a VkSamplerYcbcrConversion, multiple descriptors will be written adjacent to each other for that descriptor, equal to VkSamplerYcbcrConversionImageFormatProperties::`combinedImageSamplerDescriptorCount` for the image.

If any image descriptor written by this command is for an image created with `flags` containing VK_IMAGE_CREATE_SUBSAMPLED_BIT_EXT, multiple descriptors will be written adjacent to each other for that descriptor, equal to VkSubsampledImageFormatPropertiesEXT::`subsampledImageDescriptorCount` for the image.

Descriptors using the same `type` and written using a fully identical VkTexelBufferDescriptorInfoEXT or VkDeviceAddressRangeKHR structure on the same VkDevice will always return the same bit pattern. If the descriptorHeapCaptureReplay feature is enabled, this applies to any VkDevice created with identical parameters from the same VkPhysicalDevice.

Note | Recreating the same buffer descriptor during replay of a prior capture requires that the device address is the same, which requires additional data to be captured and provided during replay when creating a buffer and allocating memory for it.

Image descriptors using the same `type` and written using a fully identical VkImageDescriptorInfoEXT other than VkImageDescriptorInfoEXT::`pView->image`, where image was successfully created with VK_IMAGE_CREATE_DESCRIPTOR_HEAP_CAPTURE_REPLAY_BIT_EXT and a VkOpaqueCaptureDataCreateInfoEXT with data captured via vkGetImageOpaqueCaptureDataEXT from an image used previously, will write a descriptor with the same bit pattern if possible; if the same bit pattern cannot be generated, VK_ERROR_INVALID_OPAQUE_CAPTURE_ADDRESS will be returned instead.

Tensor descriptors using the same `type` and written using a fully identical VkTensorViewCreateInfoARM other than VkTensorViewCreateInfoARM::`tensor`, where tensor was successfully created with VkOpaqueCaptureDataCreateInfoEXT with VK_TENSOR_CREATE_DESCRIPTOR_HEAP_CAPTURE_REPLAY_BIT_ARM and a VkOpaqueCaptureDataCreateInfoEXT with data captured via vkGetTensorOpaqueCaptureDataARM from a tensor used previously, will write a descriptor with the same bit pattern if possible; if the same bit pattern cannot be generated, VK_ERROR_INVALID_OPAQUE_CAPTURE_ADDRESS will be returned instead.

Note | Image creation is sufficiently complex that it may not be possible to recreate all possible descriptors from an image during replay, even if the image itself was successfully recreated. The conditions for this happening will be largely the same as those which could cause allocating a buffer with the same device address during replay to fail. Replay tools are advised to recreate captured descriptors for an image immediately after recreating the image itself wherever possible. The same is true for tensors.

Valid Usage

- VUID-vkWriteResourceDescriptorsEXT-descriptorHeap-11206
  The `descriptorHeap` feature must be enabled

- VUID-vkWriteResourceDescriptorsEXT-size-11207
  The `size` member of each element of `pDescriptors` must be greater than or equal to the value returned by vkGetPhysicalDeviceDescriptorSizeEXT with a `descriptorType` equal to `type`

- VUID-vkWriteResourceDescriptorsEXT-pResources-11208
  If any element of `pResources` specifies a VkImageViewCreateInfo structure with a VkSamplerYcbcrConversionInfo structure in its `pNext` chain, the corresponding element of `pDescriptors` must have a `size` member that is greater than or equal to the product of the value returned by vkGetPhysicalDeviceDescriptorSizeEXT with a `descriptorType` equal to `type` and VkSamplerYcbcrConversionImageFormatProperties::`combinedImageSamplerDescriptorCount`, as queried from VkPhysicalDeviceImageFormatInfo2 with image format info equivalent to the image view the descriptor is being created for

- VUID-vkWriteResourceDescriptorsEXT-pResources-11209
  If any element of `pResources` specifies a VkImageViewCreateInfo structure with an `image` created with `flags` containing VK_IMAGE_CREATE_SUBSAMPLED_BIT_EXT, the corresponding element of `pDescriptors` must have a `size` member that is greater than or equal to the product of the value returned by vkGetPhysicalDeviceDescriptorSizeEXT with a `descriptorType` equal to `type` and VkSubsampledImageFormatPropertiesEXT::`subsampledImageDescriptorCount`, as queried from VkPhysicalDeviceImageFormatInfo2 with image format info equivalent to the image view the descriptor is being created for

Valid Usage (Implicit)

- VUID-vkWriteResourceDescriptorsEXT-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkWriteResourceDescriptorsEXT-pResources-parameter
  `pResources` must be a valid pointer to an array of `resourceCount` valid VkResourceDescriptorInfoEXT structures

- VUID-vkWriteResourceDescriptorsEXT-pDescriptors-parameter
  `pDescriptors` must be a valid pointer to an array of `resourceCount` valid VkHostAddressRangeEXT structures

- VUID-vkWriteResourceDescriptorsEXT-resourceCount-arraylength
  `resourceCount` must be greater than `0`

Return Codes

Success

  - VK_SUCCESS

Failure

  - VK_ERROR_OUT_OF_DEVICE_MEMORY

  - VK_ERROR_OUT_OF_HOST_MEMORY

  - VK_ERROR_UNKNOWN

  - VK_ERROR_VALIDATION_FAILED

`VkResourceDescriptorInfoEXT` is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkResourceDescriptorInfoEXT {
        VkStructureType                sType;
        const void*                    pNext;
        VkDescriptorType               type;
        VkResourceDescriptorDataEXT    data;
    } VkResourceDescriptorInfoEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `type` is the type of descriptor to get.

- `data` is a VkResourceDescriptorDataEXT union defining the properties of a resource descriptor according to `type`

If `type` is VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER or VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, `data->pTexelBuffer` is used to construct the descriptor.

If `type` is VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, or VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, `data->pAddressRange` is used to construct the descriptor. For acceleration structures, the size of the range is not used by the descriptor, and can be set to 0. If a non-zero size is provided though, it must be a valid range.

Note | Applications may wish to provide a valid range as a way to check their own assumptions about the range they are binding; but it has no bearing on anything except validation. Implementations cannot make any assumptions based on the size of the provided range.

If `type` is VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, or VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, `data->pImage` is used to construct the descriptor. If `type` is VK_DESCRIPTOR_TYPE_TENSOR_ARM, `data->pTensorARM` is used to construct the descriptor.

If the `nullDescriptor` feature is enabled, the corresponding element of `data` may be `NULL` to generate a null descriptor.

Applications can give resource descriptors a debug name in a similar way to naming an object, via the VkDebugUtilsObjectNameInfoEXT structure. However, as there is no actual object, this structure must be passed via the `pNext` chain of this structure, with a `objectType` of VK_OBJECT_TYPE_UNKNOWN and a `objectHandle` of VK_NULL_HANDLE. The name is attached to the unique set of descriptor bits written by the implementation, and writing the same bits again with new debug info may rename the original descriptor.

Note | Implementations are not prevented from returning the same bits for different descriptors. This can result in multiple different resources mapping to the same name. A common case for this might be something like a uniform buffer and storage buffer with the same device address range.

If a descriptor becomes invalid due to the underlying resource becoming invalid, implementations may remove the name association.

Valid Usage

- VUID-VkResourceDescriptorInfoEXT-type-11210
  `type` must be one of VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER, VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_TENSOR_ARM, or VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT

- VUID-VkResourceDescriptorInfoEXT-None-11211
  If the `nullDescriptor` feature is not enabled, and `type` is VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE or VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, `data->pImage` must not be `NULL`

- VUID-VkResourceDescriptorInfoEXT-type-11469
  If `type` is VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM, or VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, `data->pImage` must not be `NULL`

- VUID-VkResourceDescriptorInfoEXT-None-11212
  If the `nullDescriptor` feature is not enabled, and `type` is VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER or VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, `data->pTexelBuffer` must not be `NULL`

- VUID-VkResourceDescriptorInfoEXT-None-11213
  If the `nullDescriptor` feature is not enabled, and `type` is VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, or VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, `data->pAddressRange` must not be `NULL`

- VUID-VkResourceDescriptorInfoEXT-None-11457
  If the `nullDescriptor` feature is not enabled, and `type` is VK_DESCRIPTOR_TYPE_TENSOR_ARM, `data->pTensorARM` must not be `NULL`

- VUID-VkResourceDescriptorInfoEXT-type-12349
  If `type` is VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER or VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, `data->pTexelBuffer->addressRange.address` must be a multiple of the effective alignment requirement of `data->pTexelBuffer->format` as determined by `minTexelBufferOffsetAlignment`

- VUID-VkResourceDescriptorInfoEXT-type-12350
  If `type` is VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, `data->pAddressRange->address` must be a multiple of `minUniformBufferOffsetAlignment`

- VUID-VkResourceDescriptorInfoEXT-type-12351
  If `type` is VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, `data->pAddressRange->address` must be a multiple of `minStorageBufferOffsetAlignment`

- VUID-VkResourceDescriptorInfoEXT-type-11454
  If `type` is one of

  - VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR

  - VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV

  - VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV

    `data->pAddressRange->address` must be a multiple of 256

- VUID-VkResourceDescriptorInfoEXT-pNext-11401
  If there is a VkDebugUtilsObjectNameInfoEXT structure in the `pNext` chain, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

- VUID-VkResourceDescriptorInfoEXT-type-11422
  If `type` is VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM, or VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, `data.pImage->pView->image` must not have been created with an `imageType` of VK_IMAGE_TYPE_3D

- VUID-VkResourceDescriptorInfoEXT-type-11424
  If `type` is VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, `data.pImage->pView->viewType` is VK_IMAGE_VIEW_TYPE_2D, and the `image2DViewOf3D` feature is not enabled, `data.pImage->pView->image` must not have been created with an `imageType` of VK_IMAGE_TYPE_3D

- VUID-VkResourceDescriptorInfoEXT-type-11425
  If `type` is VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, `data.pImage->pView->viewType` is VK_IMAGE_VIEW_TYPE_2D, and the `sampler2DViewOf3D` feature is not enabled, `data.pImage->pView->image` must not have been created with an `imageType` of VK_IMAGE_TYPE_3D

- VUID-VkResourceDescriptorInfoEXT-type-11433
  If `type` is VK_DESCRIPTOR_TYPE_STORAGE_BUFFER or VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, `data.pAddressRange->size` must not be 0

- VUID-VkResourceDescriptorInfoEXT-type-11458
  If `type` is VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE and `data.pImage` is not `NULL`, `data.pImage->pView->image` must have been created with the VK_IMAGE_USAGE_SAMPLED_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11459
  If `type` is VK_DESCRIPTOR_TYPE_STORAGE_IMAGE and `data.pImage` is not `NULL`, `data.pImage->pView->image` must have been created with the VK_IMAGE_USAGE_STORAGE_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11460
  If `type` is VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT and `data.pImage` is not `NULL`, `data.pImage->pView->image` must have been created with the VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11461
  If `type` is VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER and `data.pAddressRange` is not `NULL`, `data.pAddressRange` must be a device address range allocated to the application from a buffer created with the VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11462
  If `type` is VK_DESCRIPTOR_TYPE_STORAGE_BUFFER and `data.pAddressRange` is not `NULL`, `data.pAddressRange` must be a device address range allocated to the application from a buffer created with the VK_BUFFER_USAGE_STORAGE_BUFFER_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11463
  If `type` is VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER and `data.pTexelBuffer` is not `NULL`, `data.pTexelBuffer->addressRange` must be a device address range allocated to the application from a buffer created with the VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11464
  If `type` is VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER and `data.pTexelBuffer` is not `NULL`, `data.pTexelBuffer->addressRange` must be a device address range allocated to the application from a buffer created with the VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT usage flag set

- VUID-VkResourceDescriptorInfoEXT-type-11483
  If `type` is VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV or VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, and `data.pAddressRange` is not `NULL`, `data.pAddressRange->address` must be an acceleration structure address retrieved from a VkAccelerationStructureKHR object via vkGetAccelerationStructureDeviceAddressKHR

- VUID-VkResourceDescriptorInfoEXT-type-11484
  If `type` is VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV or VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, `data.pAddressRange` is not `NULL`, and `data.pAddressRange->size` is not 0, `data.pAddressRange` must be a device address range allocated to the application from the buffer used to create the acceleration structure that `data.pAddressRange->address` was retrieved from, and within the buffer range bound to that acceleration structure

- VUID-VkResourceDescriptorInfoEXT-type-11467
  If `type` is VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV and `data.pAddressRange` is not `NULL`, `data.pAddressRange->address` must be an acceleration structure handle retrieved from a VkAccelerationStructureNV object via vkGetAccelerationStructureHandleNV

- VUID-VkResourceDescriptorInfoEXT-type-11468
  If `type` is VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV and `data.pAddressRange` is not `NULL`, `data.pAddressRange->size` must be 0

Valid Usage (Implicit)

- VUID-VkResourceDescriptorInfoEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_RESOURCE_DESCRIPTOR_INFO_EXT

- VUID-VkResourceDescriptorInfoEXT-pNext-pNext
  `pNext` must be `NULL` or a pointer to a valid instance of VkDebugUtilsObjectNameInfoEXT

- VUID-VkResourceDescriptorInfoEXT-sType-unique
  The `sType` value of each structure in the `pNext` chain must be unique

- VUID-VkResourceDescriptorInfoEXT-type-parameter
  `type` must be a valid VkDescriptorType value

- VUID-VkResourceDescriptorInfoEXT-pImage-parameter
  If `type` is VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM, or VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM, and if `pImage` is not `NULL`, the `pImage` member of `data` must be a valid pointer to a valid VkImageDescriptorInfoEXT structure

- VUID-VkResourceDescriptorInfoEXT-pTexelBuffer-parameter
  If `type` is VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER or VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, and if `pTexelBuffer` is not `NULL`, the `pTexelBuffer` member of `data` must be a valid pointer to a valid VkTexelBufferDescriptorInfoEXT structure

- VUID-VkResourceDescriptorInfoEXT-pAddressRange-parameter
  If `type` is VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, or VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, and if `pAddressRange` is not `NULL`, the `pAddressRange` member of `data` must be a valid pointer to a valid VkDeviceAddressRangeEXT structure

- VUID-VkResourceDescriptorInfoEXT-pTensorARM-parameter
  If `type` is VK_DESCRIPTOR_TYPE_TENSOR_ARM, and if `pTensorARM` is not `NULL`, the `pTensorARM` member of `data` must be a valid pointer to a valid VkTensorViewCreateInfoARM structure

The `VkResourceDescriptorDataEXT` union is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef union VkResourceDescriptorDataEXT {
        const VkImageDescriptorInfoEXT*          pImage;
        const VkTexelBufferDescriptorInfoEXT*    pTexelBuffer;
        const VkDeviceAddressRangeEXT*           pAddressRange;
        const VkTensorViewCreateInfoARM*         pTensorARM;
    } VkResourceDescriptorDataEXT;

- `pImage` is a pointer to a VkImageDescriptorInfoEXT structure.

- `pTexelBuffer` is a pointer to a VkTexelBufferDescriptorInfoEXT structure.

- `pAddressRange` is a pointer to a VkDeviceAddressRangeKHR structure.

- `pTensorARM` is a pointer to a VkTensorViewCreateInfoARM structure.

`VkTexelBufferDescriptorInfoEXT` is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkTexelBufferDescriptorInfoEXT {
        VkStructureType            sType;
        const void*                pNext;
        VkFormat                   format;
        VkDeviceAddressRangeEXT    addressRange;
    } VkTexelBufferDescriptorInfoEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `format` is the VkFormat of the descriptor.

- `addressRange` is a VkDeviceAddressRangeKHR defining the range of data backing the descriptor.

Valid Usage (Implicit)

- VUID-VkTexelBufferDescriptorInfoEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_TEXEL_BUFFER_DESCRIPTOR_INFO_EXT

- VUID-VkTexelBufferDescriptorInfoEXT-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkTexelBufferDescriptorInfoEXT-format-parameter
  `format` must be a valid VkFormat value

`VkImageDescriptorInfoEXT` is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkImageDescriptorInfoEXT {
        VkStructureType                 sType;
        const void*                     pNext;
        const VkImageViewCreateInfo*    pView;
        VkImageLayout                   layout;
    } VkImageDescriptorInfoEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `pView` is an VkImageViewCreateInfo describing the descriptor.

- `layout` is the VkImageLayout that the image view will be in when accessed as a descriptor.

Valid Usage

- VUID-VkImageDescriptorInfoEXT-pView-11426
  `pView->viewType` must not be VK_IMAGE_VIEW_TYPE_2D_ARRAY if `pView->image` was created with an `imageType` of VK_IMAGE_TYPE_3D

- VUID-VkImageDescriptorInfoEXT-pView-11427
  If `pView->viewType` is VK_IMAGE_VIEW_TYPE_2D and `pView->image` was created with an `imageType` of VK_IMAGE_TYPE_3D, `pView->image` must have been created with VK_IMAGE_CREATE_2D_VIEW_COMPATIBLE_BIT_EXT set

- VUID-VkImageDescriptorInfoEXT-layout-11219
  `layout` must be VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL, VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_STENCIL_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR, VK_IMAGE_LAYOUT_RENDERING_LOCAL_READ_KHR, VK_IMAGE_LAYOUT_ATTACHMENT_FEEDBACK_LOOP_OPTIMAL_EXT, or VK_IMAGE_LAYOUT_GENERAL

- VUID-VkImageDescriptorInfoEXT-layout-11221
  If `layout` is VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL, VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_OPTIMAL, VK_IMAGE_LAYOUT_STENCIL_READ_ONLY_OPTIMAL, or VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL, then `pView->aspectMask` must not include VK_IMAGE_ASPECT_COLOR_BIT

- VUID-VkImageDescriptorInfoEXT-pView-11430
  If `pView->image` is a depth/stencil image, `pView->subresourceRange.aspectMask` must include either VK_IMAGE_ASPECT_DEPTH_BIT or VK_IMAGE_ASPECT_STENCIL_BIT but not both

Valid Usage (Implicit)

- VUID-VkImageDescriptorInfoEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_IMAGE_DESCRIPTOR_INFO_EXT

- VUID-VkImageDescriptorInfoEXT-pNext-pNext
  `pNext` must be `NULL`

- VUID-VkImageDescriptorInfoEXT-pView-parameter
  `pView` must be a valid pointer to a valid VkImageViewCreateInfo structure

- VUID-VkImageDescriptorInfoEXT-layout-parameter
  `layout` must be a valid VkImageLayout value

### 16.2. Using Heaps

One descriptor heap of each type can be bound to a command buffer for use with shaders. When using descriptor heaps, pipelines must be created with VK_PIPELINE_CREATE_2_DESCRIPTOR_HEAP_BIT_EXT and shaders created with VK_SHADER_CREATE_DESCRIPTOR_HEAP_BIT_EXT in order to make use of the heaps.

When any heap state command is recorded to a command buffer, it immediately invalidates all descriptor set and descriptor buffer state set by vkCmdBindDescriptorSets2, vkCmdPushDescriptorSet2, vkCmdPushDescriptorSetWithTemplate2, vkCmdSetDescriptorBufferOffsets2EXT, vkCmdBindDescriptorBufferEmbeddedSamplers2EXT, vkCmdPushConstants2, vkCmdBindDescriptorSets, vkCmdPushDescriptorSet, vkCmdPushDescriptorSetWithTemplate, vkCmdBindDescriptorBuffersEXT, vkCmdSetDescriptorBufferOffsetsEXT, vkCmdBindDescriptorBufferEmbeddedSamplersEXT, or vkCmdPushConstants. Similarly, recording any of these commands immediately invalidates all state set by commands in this chapter.

Implementations may require storage in descriptor heaps for their own internal descriptors. Storage for these extra descriptors must be allocated by the application as part of each descriptor heap address range, and must not be accessed by the application while it is bound as a reserved range, in any command buffer, until all such command buffers are freed or reset. The amount of storage required by an implementation is advertised by `minResourceHeapReservedRange` for the resource heap, and `minSamplerHeapReservedRange` or `minSamplerHeapReservedRangeWithEmbedded` for the sampler heap (the latter being required when using embedded samplers).

Applications can set different heaps to use the same address ranges, but must take care to ensure that the reserved ranges for each heap do not overlap with each other or with user ranges.

To bind a sampler heap to a command buffer, call:

    // Provided by VK_EXT_descriptor_heap
    void vkCmdBindSamplerHeapEXT(
        VkCommandBuffer                             commandBuffer,
        const VkBindHeapInfoEXT*                    pBindInfo);

- `commandBuffer` is the command buffer that the sampler heap will be bound to.

- `pBindInfo` is a VkBindHeapInfoEXT specifying the device address range used for the heap and any implementation reservations.

Addresses in the range defined by `pBindInfo->heapRange` are bound as the sampler heap. The application can access samplers and data through this heap anywhere except for the reserved range specified by `pBindInfo->reservedRangeOffset`. Addresses in the range [`pBindInfo->reservedRangeOffset`, `pBindInfo->reservedRangeOffset` + `pBindInfo->reservedRangeSize`) are reserved for the implementation and must not be accessed by the application at any time from when this command is recorded until there are no command buffers with that range bound.

The reserved range is bound to the command buffer until it has been reset.

Note | Implementations may require a larger sampler heap reservation to store embedded sampler descriptors when used in a mapping, as advertised by `minSamplerHeapReservedRangeWithEmbedded`.

Shaders executed by commands recorded after this command can use the specified sampler heap to access resources. `pBindInfo->heapRange.address` will be available to shaders to access samplers and data through the `SamplerHeapEXT` `BuiltIn` or via shader bindings.

When `vkCmdBindSamplerHeapEXT` is recorded, it immediately invalidates all non-heap descriptor state. Similarly, recording any non-heap descriptor state commands immediately invalidates state set by this command.

Valid Usage

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-11223
  The sum of `pBindInfo->reservedRangeOffset` and `pBindInfo->reservedRangeSize` must be less than or equal to `pBindInfo->heapRange.size`

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-11224
  `pBindInfo->reservedRangeSize` must be greater than or equal to `minSamplerHeapReservedRange`

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-11225
  `pBindInfo->heapRange.size` must less than or equal to `maxSamplerHeapSize`

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-11226
  `pBindInfo->heapRange.address` must be a multiple of `samplerHeapAlignment`

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-11434
  `pBindInfo->reservedRangeOffset` must be a multiple of `samplerDescriptorAlignment`

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-11228
  Memory bound to addresses in the range [`pBindInfo->heapRange.address` + `pBindInfo->reservedRangeOffset`, `pBindInfo->heapRange.address` + `pBindInfo->reservedRangeOffset` + `pBindInfo->reservedRangeSize`) must not be bound to any other command buffer as a reserved range for any heap unless the reserved range matches exactly and it is the same heap type

- VUID-vkCmdBindSamplerHeapEXT-heapRange-11230
  `heapRange` must be a device address range allocated to the application from a buffer created with the VK_BUFFER_USAGE_DESCRIPTOR_HEAP_BIT_EXT usage flag set

- VUID-vkCmdBindSamplerHeapEXT-commandBuffer-11231
  If `commandBuffer` is a secondary command buffer, it must have begun with VkCommandBufferInheritanceDescriptorHeapInfoEXT::`pSamplerHeapBindInfo` equal to `NULL`

Valid Usage (Implicit)

- VUID-vkCmdBindSamplerHeapEXT-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdBindSamplerHeapEXT-pBindInfo-parameter
  `pBindInfo` must be a valid pointer to a valid VkBindHeapInfoEXT structure

- VUID-vkCmdBindSamplerHeapEXT-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdBindSamplerHeapEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support VK_QUEUE_COMPUTE_BIT, or VK_QUEUE_GRAPHICS_BIT operations

- VUID-vkCmdBindSamplerHeapEXT-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | VK_QUEUE_COMPUTE_BIT VK_QUEUE_GRAPHICS_BIT | State

Conditional Rendering

vkCmdBindSamplerHeapEXT is not affected by conditional rendering

To bind a resource heap to a command buffer, call:

    // Provided by VK_EXT_descriptor_heap
    void vkCmdBindResourceHeapEXT(
        VkCommandBuffer                             commandBuffer,
        const VkBindHeapInfoEXT*                    pBindInfo);

- `commandBuffer` is the command buffer that the resource heap will be bound to.

- `pBindInfo` is a VkBindHeapInfoEXT specifying the device address range used for the heap and any implementation reservations.

Addresses in the range defined by `pBindInfo->heapRange` are bound as the resource heap. The application can access resources and data through this heap anywhere except for the reserved range specified by `pBindInfo->reservedRangeOffset`. Addresses in the range [`pBindInfo->reservedRangeOffset`, `pBindInfo->reservedRangeOffset` + `pBindInfo->reservedRangeSize`) are reserved for the implementation and must not be accessed by the application at any time from when this command is recorded until there are no command buffers with that range bound.

The reserved range is bound to the command buffer until it has been reset.

Shaders executed by commands recorded after this command can use the specified resource heap to access resources. `pBindInfo->heapRange.address` will be available to shaders to access resources through the `ResourceHeapEXT` `BuiltIn` or via shader bindings.

When `vkCmdBindResourceHeapEXT` is recorded, it immediately invalidates all non-heap descriptor state. Similarly, recording any non-heap descriptor state commands immediately invalidates state set by this command.

Valid Usage

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11232
  The sum of `pBindInfo->reservedRangeOffset` and `pBindInfo->reservedRangeSize` must be less than or equal to `pBindInfo->heapRange.size`

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11233
  `pBindInfo->reservedRangeSize` must be greater than or equal to `minResourceHeapReservedRange`

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11234
  `pBindInfo->heapRange.size` must less than or equal to `maxResourceHeapSize`

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11235
  `pBindInfo->heapRange.address` must be a multiple of `resourceHeapAlignment`

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11435
  `pBindInfo->reservedRangeOffset` must be a multiple of `bufferDescriptorAlignment`

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11436
  `pBindInfo->reservedRangeOffset` must be a multiple of `imageDescriptorAlignment`

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-11236
  Memory bound to addresses in the range [`pBindInfo->heapRange.address` + `pBindInfo->reservedRangeOffset`, `pBindInfo->heapRange.address` + `pBindInfo->reservedRangeOffset` + `pBindInfo->reservedRangeSize`) must not be bound to any other command buffer as a reserved range for any heap unless the reserved range matches exactly and it is the same heap type

- VUID-vkCmdBindResourceHeapEXT-heapRange-11237
  `heapRange` must be a device address range allocated to the application from a buffer created with the VK_BUFFER_USAGE_DESCRIPTOR_HEAP_BIT_EXT usage flag set

- VUID-vkCmdBindResourceHeapEXT-commandBuffer-11238
  If `commandBuffer` is a secondary command buffer, it must have begun with VkCommandBufferInheritanceDescriptorHeapInfoEXT::`pResourceHeapBindInfo` equal to `NULL`

Valid Usage (Implicit)

- VUID-vkCmdBindResourceHeapEXT-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdBindResourceHeapEXT-pBindInfo-parameter
  `pBindInfo` must be a valid pointer to a valid VkBindHeapInfoEXT structure

- VUID-vkCmdBindResourceHeapEXT-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdBindResourceHeapEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support VK_QUEUE_COMPUTE_BIT, or VK_QUEUE_GRAPHICS_BIT operations

- VUID-vkCmdBindResourceHeapEXT-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | VK_QUEUE_COMPUTE_BIT VK_QUEUE_GRAPHICS_BIT | State

Conditional Rendering

vkCmdBindResourceHeapEXT is not affected by conditional rendering

`VkBindHeapInfoEXT` is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkBindHeapInfoEXT {
        VkStructureType            sType;
        const void*                pNext;
        VkDeviceAddressRangeEXT    heapRange;
        VkDeviceSize               reservedRangeOffset;
        VkDeviceSize               reservedRangeSize;
    } VkBindHeapInfoEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `heapRange` is a VkDeviceAddressRangeKHR defining the device address range used for the heap, inclusive of the implementation reserved range.

- `reservedRangeOffset` is the offset within `heapRange` to the start of the reserved range for the implementation.

- `reservedRangeSize` is the size of the reserved range for the implementation within `heapRange`.

Valid Usage (Implicit)

- VUID-VkBindHeapInfoEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_BIND_HEAP_INFO_EXT

- VUID-VkBindHeapInfoEXT-pNext-pNext
  `pNext` must be `NULL`

`SamplerHeapEXT`

  Decorating a variable with the `SamplerHeapEXT` built-in decoration will back it with the contents of the sampler heap bound by vkCmdBindSamplerHeapEXT.

Valid Usage

- VUID-SamplerHeapEXT-SamplerHeapEXT-11239
  The variable decorated with `SamplerHeapEXT` must be declared using the `UniformConstant` `Storage` `Class`

`ResourceHeapEXT`

  Decorating a variable with the `ResourceHeapEXT` built-in decoration will back it with the contents of the resource heap bound by vkCmdBindResourceHeapEXT.

Valid Usage

- VUID-ResourceHeapEXT-ResourceHeapEXT-11241
  The variable decorated with `ResourceHeapEXT` must be declared using the `UniformConstant` `Storage` `Class`

#### 16.2.1. Push Data

Push constants specified by vkCmdPushConstants or vkCmdPushConstants2KHR rely on descriptor set layout state, and are not compatible with descriptor heaps. A new push interface is provided for use with descriptor heaps:

To update push data when using descriptor heaps, call:

    // Provided by VK_EXT_descriptor_heap
    void vkCmdPushDataEXT(
        VkCommandBuffer                             commandBuffer,
        const VkPushDataInfoEXT*                    pPushDataInfo);

- `commandBuffer` is the command buffer in which the push data update will be recorded.

- `pPushDataInfo` is a pointer to a VkPushDataInfoEXT structure.

When `vkCmdPushDataEXT` is recorded, it immediately invalidates all non-heap descriptor state. Similarly, recording any non-heap descriptor state commands immediately invalidates state set by this command.

All push data is available to all shaders using the existing `PushConstant` `Storage` `Class`.

Note | Device addresses in push data are intended as the fast path for shader-constant data that does not fit into push data directly. In order to maximize performance of constant data inputs, addresses should be aligned to `minUniformBufferOffsetAlignment`, and decorated with `Alignment` and `NonWritable` in the shader when using physical pointers.

Valid Usage (Implicit)

- VUID-vkCmdPushDataEXT-commandBuffer-parameter
  `commandBuffer` must be a valid VkCommandBuffer handle

- VUID-vkCmdPushDataEXT-pPushDataInfo-parameter
  `pPushDataInfo` must be a valid pointer to a valid VkPushDataInfoEXT structure

- VUID-vkCmdPushDataEXT-commandBuffer-recording
  `commandBuffer` must be in the recording state

- VUID-vkCmdPushDataEXT-commandBuffer-cmdpool
  The `VkCommandPool` that `commandBuffer` was allocated from must support VK_QUEUE_COMPUTE_BIT, or VK_QUEUE_GRAPHICS_BIT operations

- VUID-vkCmdPushDataEXT-videocoding
  This command must only be called outside of a video coding scope

Host Synchronization

- Host access to `commandBuffer` must be externally synchronized

- Host access to the `VkCommandPool` that `commandBuffer` was allocated from must be externally synchronized

Command Properties

Command Buffer Levels | Render Pass Scope | Video Coding Scope | Supported Queue Types | Command Type
--- | --- | --- | --- | ---
Primary Secondary | Both | Outside | VK_QUEUE_COMPUTE_BIT VK_QUEUE_GRAPHICS_BIT | State

Conditional Rendering

vkCmdPushDataEXT is not affected by conditional rendering

The `VkPushDataInfoEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkPushDataInfoEXT {
        VkStructureType               sType;
        const void*                   pNext;
        uint32_t                      offset;
        VkHostAddressRangeConstEXT    data;
    } VkPushDataInfoEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `offset` is the start offset of the push data range to update, in units of bytes.

- `data` is the host address range containing the push data to update.

Valid Usage

- VUID-VkPushDataInfoEXT-offset-11243
  The sum of `offset` and `data.size` must be less than or equal to `maxPushDataSize`

- VUID-VkPushDataInfoEXT-offset-11418
  `offset` must be a multiple of 4

- VUID-VkPushDataInfoEXT-data-11419
  `data.size` must be a multiple of 4

Valid Usage (Implicit)

- VUID-VkPushDataInfoEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_PUSH_DATA_INFO_EXT

- VUID-VkPushDataInfoEXT-pNext-pNext
  `pNext` must be `NULL` or a pointer to a valid instance of VkPushConstantBankInfoNV

- VUID-VkPushDataInfoEXT-sType-unique
  The `sType` value of each structure in the `pNext` chain must be unique

- VUID-VkPushDataInfoEXT-data-parameter
  `data` must be a valid VkHostAddressRangeConstEXT structure

##### Push Data Banks

When the pushConstantBank feature is enabled, applications can specify the hardware bank into which data is pushed using the `VkPushConstantBankInfoNV` structure.

The `VkPushConstantBankInfoNV` structure is defined as:

    // Provided by VK_NV_push_constant_bank
    typedef struct VkPushConstantBankInfoNV {
        VkStructureType    sType;
        const void*        pNext;
        uint32_t           bank;
    } VkPushConstantBankInfoNV;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `bank` is the index of the hardware bank into which the data is pushed.

This structure can be chained to VkPushDataInfoEXT, VkPushConstantsInfo, VkDescriptorSetAndBindingMappingEXT, and VkIndirectCommandsLayoutTokenEXT via the `pNext` chain to specify push constant bank placement:

- When chained to VkPushDataInfoEXT, it specifies the hardware bank into which vkCmdPushDataEXT pushes the data.

- When chained to VkPushConstantsInfo, it specifies the hardware bank into which vkCmdPushConstants2 pushes the constants.

- When chained to VkDescriptorSetAndBindingMappingEXT, it specifies the hardware push data bank from which the push data is read.

- When chained to VkIndirectCommandsLayoutTokenEXT with VK_INDIRECT_COMMANDS_TOKEN_TYPE_PUSH_DATA_EXT, it specifies the hardware bank into which indirect push data is placed.

This allows for more flexible push constant management in descriptor heap scenarios where shaders access different root descriptors with specific bank requirements.

Valid Usage

- VUID-VkPushConstantBankInfoNV-bank-12342
  When chained to VkPushDataInfoEXT, if the command buffer is executing graphics operations, `bank` must be less than VkPhysicalDevicePushConstantBankPropertiesNV::`maxGraphicsPushDataBanks`

- VUID-VkPushConstantBankInfoNV-bank-12343
  When chained to VkPushDataInfoEXT, if the command buffer is executing compute operations, `bank` must be less than VkPhysicalDevicePushConstantBankPropertiesNV::`maxComputePushDataBanks`

- VUID-VkPushConstantBankInfoNV-bank-12344
  When chained to VkPushConstantsInfo, if VkPushConstantsInfo::stageFlags includes a graphics stage then `bank` must be less than VkPhysicalDevicePushConstantBankPropertiesNV::`maxGraphicsPushConstantBanks`

- VUID-VkPushConstantBankInfoNV-bank-12345
  When chained to VkPushConstantsInfo, if VkPushConstantsInfo::stageFlags includes a compute stage then `bank` must be less than VkPhysicalDevicePushConstantBankPropertiesNV::`maxComputePushConstantBanks`

- VUID-VkPushConstantBankInfoNV-bank-12346
  When chained to VkDescriptorSetAndBindingMappingEXT for a graphics shader stage, `bank` must be less than VkPhysicalDevicePushConstantBankPropertiesNV::`maxGraphicsPushDataBanks`

- VUID-VkPushConstantBankInfoNV-bank-12347
  When chained to VkDescriptorSetAndBindingMappingEXT for a compute shader stage, `bank` must be less than VkPhysicalDevicePushConstantBankPropertiesNV::`maxComputePushDataBanks`

Valid Usage (Implicit)

- VUID-VkPushConstantBankInfoNV-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_PUSH_CONSTANT_BANK_INFO_NV

Structure Chaining

Extends the structures

  - VkDescriptorSetAndBindingMappingEXT

  - VkIndirectCommandsLayoutTokenEXT

  - VkPushConstantsInfo

  - VkPushDataInfoEXT

### 16.3. Shader Bindings

While descriptor heaps can be accessed directly through the `SamplerHeapEXT` and `ResourceHeapEXT` built-ins, shaders using the existing `DescriptorSet` and `Binding` decorations can map these to heap offsets. In place of descriptor set layouts and pipeline layouts, information can be provided at pipeline or shader creation time to indicate how these bindings are mapped, through a combination of constants, push data, and indirections through device addresses. This interface provides significantly more flexibility than descriptor set layouts, enabling applications to specify precisely where they expect each descriptor to be.

The `VkShaderDescriptorSetAndBindingMappingInfoEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkShaderDescriptorSetAndBindingMappingInfoEXT {
        VkStructureType                               sType;
        const void*                                   pNext;
        uint32_t                                      mappingCount;
        const VkDescriptorSetAndBindingMappingEXT*    pMappings;
    } VkShaderDescriptorSetAndBindingMappingInfoEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `mappingCount` is the number of elements in `pMappings`.

- `pMappings` is a pointer to an array of VkDescriptorSetAndBindingMappingEXT structures specifying mappings for a set of descriptors

Including this structure in the `pNext` chain of VkPipelineShaderStageCreateInfo will set mappings for the shader defined by that structure. Similarly, including this structure in the `pNext` chain of a VkShaderCreateInfoEXT with a `codeType` of VK_SHADER_CODE_TYPE_SPIRV_EXT, will set mappings for that shader.

If this structure is not present, it is equivalent to setting `mappingCount` to 0.

Valid Usage

- VUID-VkShaderDescriptorSetAndBindingMappingInfoEXT-pMappings-11244
  Any two elements of `pMappings` must not have the same value of `descriptorSet`, an overlapping range specified by `firstBinding` and `bindingCount`, and any overlapping bits in `resourceMask`

Valid Usage (Implicit)

- VUID-VkShaderDescriptorSetAndBindingMappingInfoEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_SHADER_DESCRIPTOR_SET_AND_BINDING_MAPPING_INFO_EXT

- VUID-VkShaderDescriptorSetAndBindingMappingInfoEXT-pMappings-parameter
  If `mappingCount` is not `0`, `pMappings` must be a valid pointer to an array of `mappingCount` valid VkDescriptorSetAndBindingMappingEXT structures

Structure Chaining

Extends the structures

  - VkPipelineShaderStageCreateInfo

  - VkShaderCreateInfoEXT

The `VkDescriptorSetAndBindingMappingEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorSetAndBindingMappingEXT {
        VkStructureType                     sType;
        const void*                         pNext;
        uint32_t                            descriptorSet;
        uint32_t                            firstBinding;
        uint32_t                            bindingCount;
        VkSpirvResourceTypeFlagsEXT         resourceMask;
        VkDescriptorMappingSourceEXT        source;
        VkDescriptorMappingSourceDataEXT    sourceData;
    } VkDescriptorSetAndBindingMappingEXT;

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `descriptorSet` is the value of `DescriptorSet` for resources that this mapping affects.

- `firstBinding` is the first value of `Binding` of resources that this mapping affects.

- `bindingCount` is the number of consecutive `Binding` values of resources that this mapping affects.

- `resourceMask` is a mask of VkSpirvResourceTypeFlagBitsEXT values indicating which resource types are specified by this mapping.

- `source` is a VkDescriptorMappingSourceEXT value specifying the method of mapping specified for the affected resources.

- `sourceData` is a VkDescriptorMappingSourceDataEXT that provides the details of how each mapping is specified according to `source`.

Resources specified in a shader with a `DescriptorSet` decoration set to `descriptorSet`, a `Binding` decoration greater than or equal to `firstBinding` and less than the sum of `firstBinding` and `bindingCount`, and a resource type matching one of the bits in `resourceMask` will be mapped according to `source` and `sourceData`.

Note | Applications are free to overspecify bindings that are not present; allowing reuse of the same mapping structures with multiple shaders, even when those shaders only partially reuse those mappings. This includes things like setting binding counts higher than the number used in the shader, specifying bindings that are not present in the shader, and setting `resourceMask` to all possible resources that may be encountered.

If `source` selects an element of `sourceData` defined by a structure, the description of that structure defines how resources are mapped. Source mappings using a single base type are defined here.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, the resource will be backed by heap data as specified by `constantOffset`.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, the resource will be backed by heap data as specified by `pushIndex`.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, the resource will be backed by heap data as specified by `indirectIndex`.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, the resource will be backed by heap data as specified by `indirectIndexArray`.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_RESOURCE_HEAP_DATA_EXT, the resource will be backed by heap data as specified by `heapData`.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT, the resource will be backed by push data at a range from `pushDataOffset` to the size of the resource, allowing a uniform buffer to be backed by push data access push data. Accessing data in the uniform buffer at an offset of shaderOffset in the shader will access push data at an offset equal to

  offset = shaderOffset + pushDataOffset.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT, the resource will be backed by data pointed to by a device address in push data at an offset of `pushAddressOffset`. Accessing data via the mapped resource in the shader will access data backing the address specified in push data:

  address = ((VkDeviceAddress*)pPushData)[pushAddressOffset/8]

where pPushData is the total set of push data specified by vkCmdPushDataEXT. If the shader resource is an acceleration structure, the address must be a valid acceleration structure address.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_INDIRECT_ADDRESS_EXT, the resource will be backed by heap data as specified by `indirectAddress`.

Note | Accesses to resources using mappings to anything that is not a descriptor in a heap are not subject to robustness guarantees; resources for such mappings must not be accessed out of bounds.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, the resource will be backed by heap data as specified by `shaderRecordIndex`.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT, the resource will be backed by shader record data at a range from `shaderRecordDataOffset` to the size of the resource, allowing a uniform buffer to be used as a way to access shader record data. Accessing data in the uniform buffer at an offset shaderOffset in the shader will access shader record data at an offset equal to

  offset = shaderOffset + shaderRecordDataOffset.

If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT, the resource will be backed by data pointed to by a device address in the shader record at `shaderRecordAddressOffset`. Accessing data via the mapped resource in the shader will access data backing the address specified in shader record data:

  address = ((VkDeviceAddress*)pShaderRecordData)[shaderRecordAddressOffset/8]

where pShaderRecord is the memory associated with a given shader as its shader record. If the shader resource is an acceleration structure, the address must be a valid acceleration structure address.

Note | Accesses to resources using VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT mappings are not subject to robustness guarantees; data must not be accessed outside of the allocated memory range.

Mappings must be declared for all variables with a `DescriptorSet` and `Binding` in the shader resource interface.

Valid Usage

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11245
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_INDIRECT_ADDRESS_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_RESOURCE_HEAP_DATA_EXT, `bindingCount` must be 1

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11246
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT, `sourceData.pushDataOffset` must be a multiple of 4

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11247
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT, `sourceData.pushAddressOffset` must be a multiple of 8

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11248
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT or VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT, `bindingCount` must be 1

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11249
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT, `sourceData.shaderRecordDataOffset` must be a multiple of 4

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11250
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT, `sourceData.shaderRecordAddressOffset` must be a multiple of 8

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11251
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, and `descriptorSet`, `firstBinding`, and `bindingCount` identify any `OpTypeImage` variables, any `heapOffset`, and `heapArrayStride` members of the corresponding member of `sourceData` must be 0 or a multiple of `imageDescriptorAlignment`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11252
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, and `descriptorSet`, `firstBinding`, and `bindingCount` identify any `OpTypeStruct` variables, any `heapOffset`, and `heapArrayStride` members of the corresponding member of `sourceData` must be 0 or a multiple of `bufferDescriptorAlignment`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11253
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, and `descriptorSet`, `firstBinding`, and `bindingCount` identify any `OpTypeSampler` variables, any `heapOffset` and `heapArrayStride` members of the corresponding member of `sourceData` must be 0 or a multiple of `samplerDescriptorAlignment`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11254
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, and `descriptorSet`, `firstBinding`, and `bindingCount` identify any `OpTypeSampledImage` variables, any `samplerHeapOffset` and `samplerHeapArrayStride` members of the corresponding member of `sourceData` must be 0 or a multiple of `samplerDescriptorAlignment`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-12406
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, and `descriptorSet`, `firstBinding`, and `bindingCount` identify any `OpTypeSampledImage` variables, any `heapOffset` and `heapArrayStride` members of the corresponding member of `sourceData` must be 0 or a multiple of `imageDescriptorAlignment`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11356
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_RESOURCE_HEAP_DATA_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT, `resourceMask` must include VK_SPIRV_RESOURCE_TYPE_UNIFORM_BUFFER_BIT_EXT

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11357
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT or VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT, `resourceMask` must include at least one of VK_SPIRV_RESOURCE_TYPE_UNIFORM_BUFFER_BIT_EXT, VK_SPIRV_RESOURCE_TYPE_READ_ONLY_STORAGE_BUFFER_BIT_EXT, VK_SPIRV_RESOURCE_TYPE_READ_WRITE_STORAGE_BUFFER_BIT_EXT, or VK_SPIRV_RESOURCE_TYPE_ACCELERATION_STRUCTURE_BIT_EXT

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11358
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, and the mapping sets `useCombinedImageSamplerIndex` to VK_TRUE, `resourceMask` must include at least one of VK_SPIRV_RESOURCE_TYPE_COMBINED_SAMPLED_IMAGE_BIT_EXT, VK_SPIRV_RESOURCE_TYPE_SAMPLED_IMAGE_BIT_EXT, or VK_SPIRV_RESOURCE_TYPE_SAMPLER_BIT_EXT

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11389
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, and `bindingCount` is not `1`, the `pEmbeddedSampler` member of the corresponding mapping structure must be `NULL`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-11390
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, or VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, and `descriptorSet`, `firstBinding`, and `bindingCount` identify any `OpTypeTensorARM` variables, the `heapOffset`, and `heapArrayStride` members of the corresponding member of `sourceData` must be 0 or a multiple of `tensorDescriptorAlignment`

Valid Usage (Implicit)

- VUID-VkDescriptorSetAndBindingMappingEXT-sType-sType
  `sType` must be VK_STRUCTURE_TYPE_DESCRIPTOR_SET_AND_BINDING_MAPPING_EXT

- VUID-VkDescriptorSetAndBindingMappingEXT-pNext-pNext
  `pNext` must be `NULL` or a pointer to a valid instance of VkPushConstantBankInfoNV

- VUID-VkDescriptorSetAndBindingMappingEXT-sType-unique
  The `sType` value of each structure in the `pNext` chain must be unique

- VUID-VkDescriptorSetAndBindingMappingEXT-resourceMask-parameter
  `resourceMask` must be a valid combination of VkSpirvResourceTypeFlagBitsEXT values

- VUID-VkDescriptorSetAndBindingMappingEXT-resourceMask-requiredbitmask
  `resourceMask` must not be `0`

- VUID-VkDescriptorSetAndBindingMappingEXT-source-parameter
  `source` must be a valid VkDescriptorMappingSourceEXT value

- VUID-VkDescriptorSetAndBindingMappingEXT-constantOffset-parameter
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT, the `constantOffset` member of `sourceData` must be a valid VkDescriptorMappingSourceConstantOffsetEXT structure

- VUID-VkDescriptorSetAndBindingMappingEXT-pushIndex-parameter
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT, the `pushIndex` member of `sourceData` must be a valid VkDescriptorMappingSourcePushIndexEXT structure

- VUID-VkDescriptorSetAndBindingMappingEXT-indirectIndex-parameter
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT, the `indirectIndex` member of `sourceData` must be a valid VkDescriptorMappingSourceIndirectIndexEXT structure

- VUID-VkDescriptorSetAndBindingMappingEXT-indirectIndexArray-parameter
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT, the `indirectIndexArray` member of `sourceData` must be a valid VkDescriptorMappingSourceIndirectIndexArrayEXT structure

- VUID-VkDescriptorSetAndBindingMappingEXT-shaderRecordIndex-parameter
  If `source` is VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT, the `shaderRecordIndex` member of `sourceData` must be a valid VkDescriptorMappingSourceShaderRecordIndexEXT structure

Bits which can be set in VkDescriptorSetAndBindingMappingEXT::`resourceMask`, are:

    // Provided by VK_EXT_descriptor_heap
    typedef enum VkSpirvResourceTypeFlagBitsEXT {
        VK_SPIRV_RESOURCE_TYPE_ALL_EXT = 0x7FFFFFFF,
        VK_SPIRV_RESOURCE_TYPE_SAMPLER_BIT_EXT = 0x00000001,
        VK_SPIRV_RESOURCE_TYPE_SAMPLED_IMAGE_BIT_EXT = 0x00000002,
        VK_SPIRV_RESOURCE_TYPE_READ_ONLY_IMAGE_BIT_EXT = 0x00000004,
        VK_SPIRV_RESOURCE_TYPE_READ_WRITE_IMAGE_BIT_EXT = 0x00000008,
        VK_SPIRV_RESOURCE_TYPE_COMBINED_SAMPLED_IMAGE_BIT_EXT = 0x00000010,
        VK_SPIRV_RESOURCE_TYPE_UNIFORM_BUFFER_BIT_EXT = 0x00000020,
        VK_SPIRV_RESOURCE_TYPE_READ_ONLY_STORAGE_BUFFER_BIT_EXT = 0x00000040,
        VK_SPIRV_RESOURCE_TYPE_READ_WRITE_STORAGE_BUFFER_BIT_EXT = 0x00000080,
      // Provided by VK_EXT_descriptor_heap with VK_KHR_ray_tracing_pipeline or VK_NV_ray_tracing
        VK_SPIRV_RESOURCE_TYPE_ACCELERATION_STRUCTURE_BIT_EXT = 0x00000100,
      // Provided by VK_EXT_descriptor_heap with VK_ARM_tensors
        VK_SPIRV_RESOURCE_TYPE_TENSOR_BIT_ARM = 0x00000200,
    } VkSpirvResourceTypeFlagBitsEXT;

- VK_SPIRV_RESOURCE_TYPE_ALL_EXT specifies that all resource declarations are included.

- VK_SPIRV_RESOURCE_TYPE_SAMPLER_BIT_EXT specifies `OpTypeSampler` variables.

- VK_SPIRV_RESOURCE_TYPE_SAMPLED_IMAGE_BIT_EXT specifies `OpTypeImage` variables with a `Sampled` parameter of 1.

- VK_SPIRV_RESOURCE_TYPE_READ_ONLY_IMAGE_BIT_EXT specifies `OpTypeImage` variables with a `Sampled` parameter of 2 and decorated with `NonWritable`.

- VK_SPIRV_RESOURCE_TYPE_READ_WRITE_IMAGE_BIT_EXT specifies `OpTypeImage` variables with a `Sampled` parameter of 2 and not decorated with `NonWritable`.

- VK_SPIRV_RESOURCE_TYPE_COMBINED_SAMPLED_IMAGE_BIT_EXT specifies `OpTypeSampledImage` variables.

- VK_SPIRV_RESOURCE_TYPE_UNIFORM_BUFFER_BIT_EXT specifies `OpTypeStruct` variables in the `Uniform` storage class decorated with `Block`

- VK_SPIRV_RESOURCE_TYPE_READ_ONLY_STORAGE_BUFFER_BIT_EXT specifies `OpTypeStruct` variables either in the `StorageBuffer` storage class decorated with `Block` or in the `Uniform` storage class decorated with `BufferBlock`, and decorated with `NonWritable`

- VK_SPIRV_RESOURCE_TYPE_READ_WRITE_STORAGE_BUFFER_BIT_EXT specifies `OpTypeStruct` variables either in the `StorageBuffer` storage class decorated with `Block` or in the `Uniform` storage class decorated with `BufferBlock`, but not decorated with `NonWritable`

- VK_SPIRV_RESOURCE_TYPE_ACCELERATION_STRUCTURE_BIT_EXT specifies `OpTypeAccelerationStructureKHR` variables

- VK_SPIRV_RESOURCE_TYPE_TENSOR_BIT_ARM specifies `OpTypeTensorARM` variables

    // Provided by VK_EXT_descriptor_heap
    typedef VkFlags VkSpirvResourceTypeFlagsEXT;

`VkSpirvResourceTypeFlagsEXT` is a bitmask type for setting a mask of zero or more VkSpirvResourceTypeFlagBitsEXT.

The possible mapping sources for a shader binding are:

    // Provided by VK_EXT_descriptor_heap
    typedef enum VkDescriptorMappingSourceEXT {
        VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT = 0,
        VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT = 1,
        VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT = 2,
        VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT = 3,
        VK_DESCRIPTOR_MAPPING_SOURCE_RESOURCE_HEAP_DATA_EXT = 4,
        VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT = 5,
        VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT = 6,
        VK_DESCRIPTOR_MAPPING_SOURCE_INDIRECT_ADDRESS_EXT = 7,
      // Provided by VK_EXT_descriptor_heap with VK_KHR_ray_tracing_pipeline or VK_NV_ray_tracing
        VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT = 8,
      // Provided by VK_EXT_descriptor_heap with VK_KHR_ray_tracing_pipeline or VK_NV_ray_tracing
        VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT = 9,
      // Provided by VK_EXT_descriptor_heap with VK_KHR_ray_tracing_pipeline or VK_NV_ray_tracing
        VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT = 10,
    } VkDescriptorMappingSourceEXT;

- VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_CONSTANT_OFFSET_EXT specifies that the resource will be backed by a descriptor from the heap at a constant index.

- VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_PUSH_INDEX_EXT specifies that the resource will be backed by a descriptor from the heap at an index sourced from push data, added to a constant index.

- VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_EXT specifies that the resource will be backed by a descriptor from the heap at an index sourced from an address in push data, added to a constant index. If the mapping is an array, the array will be mapped to a base offset in indirect memory, and subsequent elements are mapped as offsets to that base.

- VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_INDIRECT_INDEX_ARRAY_EXT specifies that the resource will be backed by a descriptor from the heap at an index sourced from an address in push data, added to a constant index. If the mapping is an array, each array element will be mapped to a separate index in indirect memory.

- VK_DESCRIPTOR_MAPPING_SOURCE_RESOURCE_HEAP_DATA_EXT specifies that the resource will be backed by heap data directly.

- VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_DATA_EXT specifies that the resource will be backed by push data directly.

- VK_DESCRIPTOR_MAPPING_SOURCE_PUSH_ADDRESS_EXT specifies that the resource will be backed by an address in push data.

- VK_DESCRIPTOR_MAPPING_SOURCE_INDIRECT_ADDRESS_EXT specifies that the resource will be backed by an address sourced via another address in push data.

- VK_DESCRIPTOR_MAPPING_SOURCE_HEAP_WITH_SHADER_RECORD_INDEX_EXT specifies that the resource will be backed by a descriptor from the heap at an index sourced from shader record data, added to a constant index.

- VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_DATA_EXT specifies that the resource will be backed by shader record data directly.

- VK_DESCRIPTOR_MAPPING_SOURCE_SHADER_RECORD_ADDRESS_EXT specifies that the resource will be backed by an address in shader record data.

The `VkDescriptorMappingSourceDataEXT` union is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef union VkDescriptorMappingSourceDataEXT {
        VkDescriptorMappingSourceConstantOffsetEXT        constantOffset;
        VkDescriptorMappingSourcePushIndexEXT             pushIndex;
        VkDescriptorMappingSourceIndirectIndexEXT         indirectIndex;
        VkDescriptorMappingSourceIndirectIndexArrayEXT    indirectIndexArray;
        VkDescriptorMappingSourceHeapDataEXT              heapData;
        uint32_t                                          pushDataOffset;
        uint32_t                                          pushAddressOffset;
        VkDescriptorMappingSourceIndirectAddressEXT       indirectAddress;
        VkDescriptorMappingSourceShaderRecordIndexEXT     shaderRecordIndex;
        uint32_t                                          shaderRecordDataOffset;
        uint32_t                                          shaderRecordAddressOffset;
    } VkDescriptorMappingSourceDataEXT;

- `constantOffset` is a VkDescriptorMappingSourceConstantOffsetEXT structure specifying the mapping for resources at a constant byte offset into a heap.

- `pushIndex` is a VkDescriptorMappingSourcePushIndexEXT structure specifying the mapping for resources at an index into a heap source from push data.

- `indirectIndex` is a VkDescriptorMappingSourceIndirectIndexEXT structure specifying the mapping for resources at an index into a heap source from an address in push data.

- `indirectIndexArray` is a VkDescriptorMappingSourceIndirectIndexArrayEXT structure specifying the mapping for resources to an array of indices into a heap source from an address in push data.

- `heapData` is a VkDescriptorMappingSourceHeapDataEXT structure specifying an offset into heap data for a uniform buffer to map to.

- `pushDataOffset` an offset into push data for a uniform buffer to map to.

- `pushAddressOffset` an offset into push data storing an address for a resource to map to.

- `indirectAddress` is a VkDescriptorMappingSourceIndirectAddressEXT structure specifying an address in push data containing another address for a resource to map to.

- `shaderRecordIndex` is a VkDescriptorMappingSourceShaderRecordIndexEXT structure specifying the mapping for resources at an index into a heap source from shader record data.

- `shaderRecordDataOffset` an offset into shader record data for a uniform buffer to map to.

- `shaderRecordAddressOffset` an offset into shader record data storing an address for a resource to map to.

The `VkDescriptorMappingSourceConstantOffsetEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourceConstantOffsetEXT {
        uint32_t                      heapOffset;
        uint32_t                      heapArrayStride;
        const VkSamplerCreateInfo*    pEmbeddedSampler;
        uint32_t                      samplerHeapOffset;
        uint32_t                      samplerHeapArrayStride;
    } VkDescriptorMappingSourceConstantOffsetEXT;

- `heapOffset` is a constant byte offset added to the heap address for the mapped resource or sampler.

- `heapArrayStride` is a constant byte stride that multiplies the shader binding and array index.

- `pEmbeddedSampler` is an optional VkSamplerCreateInfo structure specifying a sampler to embed into the shader, in place of looking the sampler up in a heap.

- `samplerHeapOffset` is used only when mapping a combined image sampler, used in place of `heapOffset` to retrieve the sampler.

- `samplerHeapArrayStride` is used only when mapping a combined image sampler, used in place of `heapArrayStride` to retrieve the sampler.

Resources using this mapping will be backed by a descriptor in the heap, at an offset calculated as

  shaderIndex = (Binding - `firstBinding`) + arrayIndex

  offset = heapOffset + (shaderIndex * heapArrayStride)

where Binding is the binding value in the shader, arrayIndex is the index into the array if the shader binding is declared as an array.

If the mapped resource is a `OpTypeSampledImage`, offset is instead calculated for the sampler as

  offset = samplerHeapOffset + (shaderIndex * samplerHeapArrayStride)

If the mapped resource is a `OpTypeSampler` or `OpTypeSampledImage`, and `pEmbeddedSampler` is not `NULL`, the specified embedded sampler will be used rather than accessing the sampler heap.

Valid Usage

- VUID-VkDescriptorMappingSourceConstantOffsetEXT-pEmbeddedSampler-11445
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, its `borderColor` must not be VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT

- VUID-VkDescriptorMappingSourceConstantOffsetEXT-pEmbeddedSampler-11415
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, and there is a VkDebugUtilsObjectNameInfoEXT structure in its `pNext` chain, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

Valid Usage (Implicit)

- VUID-VkDescriptorMappingSourceConstantOffsetEXT-pEmbeddedSampler-parameter
  If `pEmbeddedSampler` is not `NULL`, `pEmbeddedSampler` must be a valid pointer to a valid VkSamplerCreateInfo structure

The `VkDescriptorMappingSourcePushIndexEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourcePushIndexEXT {
        uint32_t                      heapOffset;
        uint32_t                      pushOffset;
        uint32_t                      heapIndexStride;
        uint32_t                      heapArrayStride;
        const VkSamplerCreateInfo*    pEmbeddedSampler;
        VkBool32                      useCombinedImageSamplerIndex;
        uint32_t                      samplerHeapOffset;
        uint32_t                      samplerPushOffset;
        uint32_t                      samplerHeapIndexStride;
        uint32_t                      samplerHeapArrayStride;
    } VkDescriptorMappingSourcePushIndexEXT;

- `heapOffset` is a constant byte offset added to the heap address for the mapped resource or sampler.

- `pushOffset` is an index into push data where an index into the heap for the mapped resource will be retrieved.

- `heapIndexStride` is a constant byte stride that multiplies the index in push data.

- `heapArrayStride` is a constant byte stride that multiplies the shader binding and array index.

- `pEmbeddedSampler` is an optional VkSamplerCreateInfo structure specifying a sampler to embed into the shader, in place of looking the sampler up in a heap.

- `useCombinedImageSamplerIndex` specifies whether the generated index value will be decoded as two packed indices if the mapped resource is an `OpTypeSampledImage`.

- `samplerHeapOffset` is used only when mapping a combined image sampler, used in place of `heapOffset` to retrieve the sampler.

- `samplerPushOffset` is used only when mapping a combined image sampler, used in place of `pushOffset` to retrieve the sampler.

- `samplerHeapIndexStride` is used only when mapping a combined image sampler, used in place of `heapIndexStride` to retrieve the sampler.

- `samplerHeapArrayStride` is used only when mapping a combined image sampler, used in place of `heapArrayStride` to retrieve the sampler.

Resources using this mapping will be backed by a descriptor in the heap, at an offset calculated as

  pushIndex = ((uint32_t*)pPushData)[pushOffset/4]

  shaderIndex = (Binding - firstBinding) + arrayIndex

  offset = heapOffset + (pushIndex × heapIndexStride) + (shaderIndex × heapArrayStride)

where Binding is the binding value in the shader, arrayIndex is the index into the array if the shader binding is declared as an array, and pPushData is the total set of push data specified by vkCmdPushDataEXT.

If the mapped resource is a `OpTypeSampledImage`, offset is instead calculated for the sampler as

  samplerPushIndex = ((uint32_t*)pPushData)[samplerPushOffset/4]

  offset = samplerHeapOffset + (samplerPushIndex × samplerHeapIndexStride) + (shaderIndex × samplerHeapArrayStride)

If `useCombinedImageSamplerIndex` is VK_TRUE, and the mapped resource is a `OpTypeSampledImage`, pushIndex and samplerPushIndex in the above equations are instead calculated as

  pushIndex = ((uint32_t*)pPushData)[pushOffset/4] & 0xFFFFF

  samplerPushIndex = (((uint32_t*)pPushData)[pushOffset/4] >> 20) & 0xFFF

If the mapped resource is a `OpTypeSampler` or `OpTypeSampledImage`, and `pEmbeddedSampler` is not `NULL`, the specified embedded sampler will be used rather than accessing the sampler heap.

Valid Usage

- VUID-VkDescriptorMappingSourcePushIndexEXT-pushOffset-11258
  `pushOffset` must be a multiple of 4

- VUID-VkDescriptorMappingSourcePushIndexEXT-pushOffset-11259
  `pushOffset` must be less than or equal to `maxPushDataSize` - 4

- VUID-VkDescriptorMappingSourcePushIndexEXT-pEmbeddedSampler-11446
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, its `borderColor` must not be VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT

- VUID-VkDescriptorMappingSourcePushIndexEXT-pEmbeddedSampler-11402
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, and there is a VkDebugUtilsObjectNameInfoEXT structure in its `pNext` chain, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

Valid Usage (Implicit)

- VUID-VkDescriptorMappingSourcePushIndexEXT-pEmbeddedSampler-parameter
  If `pEmbeddedSampler` is not `NULL`, `pEmbeddedSampler` must be a valid pointer to a valid VkSamplerCreateInfo structure

The `VkDescriptorMappingSourceIndirectIndexEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourceIndirectIndexEXT {
        uint32_t                      heapOffset;
        uint32_t                      pushOffset;
        uint32_t                      addressOffset;
        uint32_t                      heapIndexStride;
        uint32_t                      heapArrayStride;
        const VkSamplerCreateInfo*    pEmbeddedSampler;
        VkBool32                      useCombinedImageSamplerIndex;
        uint32_t                      samplerHeapOffset;
        uint32_t                      samplerPushOffset;
        uint32_t                      samplerAddressOffset;
        uint32_t                      samplerHeapIndexStride;
        uint32_t                      samplerHeapArrayStride;
    } VkDescriptorMappingSourceIndirectIndexEXT;

- `heapOffset` is a constant byte offset added to the heap address for the mapped resource or sampler.

- `pushOffset` is an offset into push data where an the indirect address will be.

- `addressOffset` is an index into the address in push data where an index into the heap for the mapped resource will be retrieved.

- `heapIndexStride` is a constant byte stride that multiplies the index in indirect data.

- `heapArrayStride` is a constant byte stride that multiplies the shader binding and array index.

- `pEmbeddedSampler` is an optional VkSamplerCreateInfo structure specifying a sampler to embed into the shader, in place of looking the sampler up in a heap.

- `useCombinedImageSamplerIndex` specifies whether the generated index value will be decoded as two packed indices if the mapped resource is an `OpTypeSampledImage`.

- `samplerHeapOffset` is used only when mapping a combined image sampler, used in place of `heapOffset` to retrieve the sampler.

- `samplerPushOffset` is used only when mapping a combined image sampler, used in place of `pushOffset` to retrieve the sampler.

- `samplerAddressOffset` is used only when mapping a combined image sampler, used in place of `addressOffset` to retrieve the sampler.

- `samplerHeapIndexStride` is used only when mapping a combined image sampler, used in place of `heapIndexStride` to retrieve the sampler.

- `samplerHeapArrayStride` is used only when mapping a combined image sampler, used in place of `heapArrayStride` to retrieve the sampler.

Resources using this mapping will be backed by a descriptor in the heap, at an offset calculated as

  uint32_t *indirectAddress = ((VkDeviceAddress*)pPushData)[pushOffset/8]

  indirectIndex = indirectAddress[(addressOffset / 4)]

  shaderIndex = (Binding - firstBinding) + arrayIndex

  offset = heapOffset + (indirectIndex × heapIndexStride) + (shaderIndex × heapArrayStride)

where Binding is the binding value in the shader, arrayIndex is the index into the array if the shader binding is declared as an array, and pPushData is the total set of push data specified by vkCmdPushDataEXT. The value of the address in push data must be a multiple of 4. Index reads through indirectAddress are performed as non-volatile uniform buffer reads, and can be synchronized using VK_ACCESS_2_UNIFORM_READ_BIT. The value in memory must remain static while any shader invocation using this mapping is in flight to avoid a data race.

If the mapped resource is a `OpTypeSampledImage`, offset is instead calculated for the sampler as

  uint32_t *samplerIndirectAddress = ((VkDeviceAddress*)pPushData)[samplerPushOffset/8]

  samplerIndirectIndex = samplerIndirectAddress[(samplerAddressOffset / 4)]

  offset = samplerHeapOffset + (samplerIndirectIndex × samplerHeapIndexStride) + (shaderIndex × samplerHeapArrayStride)

If `useCombinedImageSamplerIndex` is VK_TRUE, and the mapped resource is a `OpTypeSampledImage`, indirectIndex and samplerIndirectIndex in the above equations are instead calculated as

  indirectIndex = indirectAddress[addressOffset/4] & 0xFFFFF

  samplerIndirectIndex = indirectAddress[addressOffset/4] >> 20) & 0xFFF

If the mapped resource is a `OpTypeSampler` or `OpTypeSampledImage`, and `pEmbeddedSampler` is not `NULL`, the specified embedded sampler will be used rather than accessing the sampler heap.

Valid Usage

- VUID-VkDescriptorMappingSourceIndirectIndexEXT-pushOffset-11260
  `pushOffset` must be a multiple of 8

- VUID-VkDescriptorMappingSourceIndirectIndexEXT-pushOffset-11261
  `pushOffset` must be less than or equal to `maxPushDataSize` - 8

- VUID-VkDescriptorMappingSourceIndirectIndexEXT-addressOffset-11262
  `addressOffset` must be a multiple of 4

- VUID-VkDescriptorMappingSourceIndirectIndexEXT-pEmbeddedSampler-11447
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, its `borderColor` must not be VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT

- VUID-VkDescriptorMappingSourceIndirectIndexEXT-pEmbeddedSampler-11403
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, and there is a VkDebugUtilsObjectNameInfoEXT structure in its `pNext` chain, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

Valid Usage (Implicit)

- VUID-VkDescriptorMappingSourceIndirectIndexEXT-pEmbeddedSampler-parameter
  If `pEmbeddedSampler` is not `NULL`, `pEmbeddedSampler` must be a valid pointer to a valid VkSamplerCreateInfo structure

The `VkDescriptorMappingSourceIndirectIndexArrayEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourceIndirectIndexArrayEXT {
        uint32_t                      heapOffset;
        uint32_t                      pushOffset;
        uint32_t                      addressOffset;
        uint32_t                      heapIndexStride;
        const VkSamplerCreateInfo*    pEmbeddedSampler;
        VkBool32                      useCombinedImageSamplerIndex;
        uint32_t                      samplerHeapOffset;
        uint32_t                      samplerPushOffset;
        uint32_t                      samplerAddressOffset;
        uint32_t                      samplerHeapIndexStride;
    } VkDescriptorMappingSourceIndirectIndexArrayEXT;

- `heapOffset` is a constant byte offset added to the heap address for the mapped resource or sampler.

- `pushOffset` is an offset into push data where an the indirect address will be.

- `addressOffset` is an index into the address in push data where an index into the heap for the mapped resource will be retrieved.

- `heapIndexStride` is a constant byte stride that multiplies the index in indirect data.

- `pEmbeddedSampler` is an optional VkSamplerCreateInfo structure specifying a sampler to embed into the shader, in place of looking the sampler up in a heap.

- `useCombinedImageSamplerIndex` specifies whether the generated index value will be decoded as two packed indices if the mapped resource is an `OpTypeSampledImage`.

- `samplerHeapOffset` is used only when mapping a combined image sampler, used in place of `heapOffset` to retrieve the sampler.

- `samplerPushOffset` is used only when mapping a combined image sampler, used in place of `pushOffset` to retrieve the sampler.

- `samplerAddressOffset` is used only when mapping a combined image sampler, used in place of `addressOffset` to retrieve the sampler.

- `samplerHeapIndexStride` is used only when mapping a combined image sampler, used in place of `heapIndexStride` to retrieve the sampler.

Resources using this mapping will be backed by a descriptor in the heap, at an offset calculated as

  uint32_t *indirectAddress = ((VkDeviceAddress*)pPushData)[pushOffset/8]

  shaderIndex = (Binding - firstBinding) + arrayIndex

  indirectIndex = indirectAddress[(addressOffset / 4) + shaderIndex]

  offset = heapOffset + (indirectIndex × heapIndexStride)

where Binding is the binding value in the shader, arrayIndex is the index into the array if the shader binding is declared as an array, and pPushData is the total set of push data specified by vkCmdPushDataEXT. The value of the address in push data must be a multiple of 4. Index reads through indirectAddress are performed as non-volatile uniform buffer reads, and can be synchronized using VK_ACCESS_2_UNIFORM_READ_BIT. The value in memory must remain static while any shader invocation using this mapping is in flight to avoid a data race.

If the mapped resource is a `OpTypeSampledImage`, offset is instead calculated for the sampler as

  uint32_t *samplerIndirectAddress = ((VkDeviceAddress*)pPushData)[samplerPushOffset/8]

  samplerIndirectIndex = samplerAddr[(samplerAddressOffset / 4) + shaderIndex]

  offset = samplerHeapOffset + (samplerIndirectIndex × samplerHeapIndexStride)

If `useCombinedImageSamplerIndex` is VK_TRUE, and the mapped resource is a `OpTypeSampledImage`, indirectIndex and samplerIndirectIndex in the above equations are instead calculated as

  indirectIndex = indirectAddress[addressOffset/4 + shaderIndex] & 0xFFFFF

  samplerIndirectIndex = indirectAddress[addressOffset/4 + shaderIndex] >> 20) & 0xFFF

If the mapped resource is a `OpTypeSampler` or `OpTypeSampledImage`, and `pEmbeddedSampler` is not `NULL`, the specified embedded sampler will be used rather than accessing the sampler heap.

Valid Usage

- VUID-VkDescriptorMappingSourceIndirectIndexArrayEXT-pushOffset-11359
  `pushOffset` must be a multiple of 8

- VUID-VkDescriptorMappingSourceIndirectIndexArrayEXT-pushOffset-11360
  `pushOffset` must be less than or equal to `maxPushDataSize` - 8

- VUID-VkDescriptorMappingSourceIndirectIndexArrayEXT-addressOffset-11361
  `addressOffset` must be a multiple of 4

- VUID-VkDescriptorMappingSourceIndirectIndexArrayEXT-pEmbeddedSampler-11448
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, its `borderColor` must not be VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT

- VUID-VkDescriptorMappingSourceIndirectIndexArrayEXT-pEmbeddedSampler-11404
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, and there is a VkDebugUtilsObjectNameInfoEXT structure in its `pNext` chain, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

Valid Usage (Implicit)

- VUID-VkDescriptorMappingSourceIndirectIndexArrayEXT-pEmbeddedSampler-parameter
  If `pEmbeddedSampler` is not `NULL`, `pEmbeddedSampler` must be a valid pointer to a valid VkSamplerCreateInfo structure

The `VkDescriptorMappingSourceHeapDataEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourceHeapDataEXT {
        uint32_t    heapOffset;
        uint32_t    pushOffset;
    } VkDescriptorMappingSourceHeapDataEXT;

- `heapOffset` is a constant byte offset added to the heap address for the mapped buffer.

- `pushOffset` is an index into push data where an additional offset into the heap for the mapped resource will be retrieved.

Uniform buffers using this mapping will be backed directly by data in the heap. Accessing data in the uniform buffer at an offset of shaderOffset in the shader will access heap data at an offset equal to

  offset = shaderOffset + heapOffset + ((uint32_t*)pPushData)[pushOffset/4]

where pPushData is the total set of push data specified by vkCmdPushDataEXT. Shader reads through the heap mapped in this way are performed according to the mapped resource.

Valid Usage

- VUID-VkDescriptorMappingSourceHeapDataEXT-heapOffset-11263
  `heapOffset` must be a multiple of `minUniformBufferOffsetAlignment`

- VUID-VkDescriptorMappingSourceHeapDataEXT-pushOffset-11264
  `pushOffset` must be a multiple of 4

- VUID-VkDescriptorMappingSourceHeapDataEXT-pushOffset-11265
  `pushOffset` must be less than or equal to `maxPushDataSize` - 4

The `VkDescriptorMappingSourceIndirectAddressEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourceIndirectAddressEXT {
        uint32_t    pushOffset;
        uint32_t    addressOffset;
    } VkDescriptorMappingSourceIndirectAddressEXT;

- `pushOffset` is a byte offset into push data where an indirect address containing the address for the mapped resource will be retrieved.

- `addressOffset` is a byte offset into the indirect address where the address for the mapped resource will be retrieved.

Accessing data via the mapped resource in the shader will access data backing the address specified in the indirect address at the supplied offset:

  indirectAddress = ((VkDeviceAddress*)pPushData)[pushOffset/8]

  resourceAddress = ((VkDeviceAddress*)indirectAddress)[addressOffset/8]

where pPushData is the total set of push data specified by vkCmdPushDataEXT. Reads through indirectAddress are performed as non-volatile uniform buffer reads, and can be synchronized using VK_ACCESS_2_UNIFORM_READ_BIT. Shader reads through resourceAddress are performed according to the mapped resource. If the shader resource is an acceleration structure, the address must be a valid acceleration structure address.

Valid Usage

- VUID-VkDescriptorMappingSourceIndirectAddressEXT-pushOffset-11266
  `pushOffset` must be a multiple of 8

- VUID-VkDescriptorMappingSourceIndirectAddressEXT-pushOffset-11267
  `pushOffset` must be less than or equal to `maxPushDataSize` - 8

- VUID-VkDescriptorMappingSourceIndirectAddressEXT-addressOffset-11268
  `addressOffset` must be a multiple of 8

The `VkDescriptorMappingSourceShaderRecordIndexEXT` structure is defined as:

    // Provided by VK_EXT_descriptor_heap
    typedef struct VkDescriptorMappingSourceShaderRecordIndexEXT {
        uint32_t                      heapOffset;
        uint32_t                      shaderRecordOffset;
        uint32_t                      heapIndexStride;
        uint32_t                      heapArrayStride;
        const VkSamplerCreateInfo*    pEmbeddedSampler;
        VkBool32                      useCombinedImageSamplerIndex;
        uint32_t                      samplerHeapOffset;
        uint32_t                      samplerShaderRecordOffset;
        uint32_t                      samplerHeapIndexStride;
        uint32_t                      samplerHeapArrayStride;
    } VkDescriptorMappingSourceShaderRecordIndexEXT;

- `heapOffset` is a constant byte offset added to the heap address for the mapped resource or sampler.

- `shaderRecordOffset` is an index into shader record data where an index into the heap for the mapped resource will be retrieved.

- `heapIndexStride` is a constant byte stride that multiplies the index in shader record data.

- `heapArrayStride` is a constant byte stride that multiplies the shader binding and array index.

- `pEmbeddedSampler` is an optional VkSamplerCreateInfo structure specifying a sampler to embed into the shader, in place of looking the sampler up in a heap.

- `useCombinedImageSamplerIndex` specifies whether the generated index value will be decoded as two packed indices if the mapped resource is an `OpTypeSampledImage`.

- `samplerHeapOffset` is used only when mapping a combined image sampler, used in place of `heapOffset` to retrieve the sampler.

- `samplerShaderRecordOffset` is used only when mapping a combined image sampler, used in place of `shaderRecordOffset` to retrieve the sampler.

- `samplerHeapIndexStride` is used only when mapping a combined image sampler, used in place of `heapIndexStride` to retrieve the sampler.

- `samplerHeapArrayStride` is used only when mapping a combined image sampler, used in place of `heapArrayStride` to retrieve the sampler.

Resources using this mapping will be backed by a descriptor in the heap, at an offset calculated as

  shaderRecordIndex = ((uint32_t*)pShaderRecordData)[shaderRecordOffset/4]

  shaderIndex = (Binding - firstBinding) + arrayIndex

  offset = heapOffset + (shaderRecordIndex × heapIndexStride) + (shaderIndex × heapArrayStride)

where Binding is the binding value in the shader, arrayIndex is the index into the array if the shader binding is declared as an array, and pShaderRecordData is the set of shader record data accessible to the shader.

If the mapped resource is a `OpTypeSampledImage`, offset is instead calculated for the sampler as

  samplerShaderRecordIndex = ((uint32_t*)pShaderRecordData)[samplerShaderRecordOffset/4]

  offset = samplerHeapOffset + (samplerShaderRecordIndex × samplerHeapIndexStride) + (shaderIndex × samplerHeapArrayStride)

If `useCombinedImageSamplerIndex` is VK_TRUE, and the mapped resource is a `OpTypeSampledImage`, shaderRecordIndex and samplerShaderRecordIndex in the above equations are instead calculated as

  shaderRecordIndex = ((uint32_t*)pShaderRecordData)[shaderRecordOffset/4] & 0xFFFFF

  samplerShaderRecordIndex = (((uint32_t*)pShaderRecordData)[shaderRecordOffset/4] >> 20) & 0xFFF

If the mapped resource is a `OpTypeSampler` or `OpTypeSampledImage`, and `pEmbeddedSampler` is not `NULL`, the specified embedded sampler will be used rather than accessing the sampler heap.

Valid Usage

- VUID-VkDescriptorMappingSourceShaderRecordIndexEXT-shaderRecordOffset-11269
  `shaderRecordOffset` must be a multiple of 4

- VUID-VkDescriptorMappingSourceShaderRecordIndexEXT-shaderRecordOffset-11270
  `shaderRecordOffset` must be less than or equal to `maxShaderGroupStride` - 4

- VUID-VkDescriptorMappingSourceShaderRecordIndexEXT-pEmbeddedSampler-11449
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, its `borderColor` must not be VK_BORDER_COLOR_FLOAT_CUSTOM_EXT or VK_BORDER_COLOR_INT_CUSTOM_EXT

- VUID-VkDescriptorMappingSourceShaderRecordIndexEXT-pEmbeddedSampler-11405
  If `pEmbeddedSampler` is a valid pointer to a VkSamplerCreateInfo, and there is a VkDebugUtilsObjectNameInfoEXT structure in its `pNext` chain, its `objectType` must be VK_OBJECT_TYPE_UNKNOWN

Valid Usage (Implicit)

- VUID-VkDescriptorMappingSourceShaderRecordIndexEXT-pEmbeddedSampler-parameter
  If `pEmbeddedSampler` is not `NULL`, `pEmbeddedSampler` must be a valid pointer to a valid VkSamplerCreateInfo structure

### 16.4. Packing descriptors more tightly

For simplicity, descriptor sizes are advertised and treated by default as equal to the advertised descriptor size limits:

- `samplerDescriptorSize`

- `bufferDescriptorSize`

- `imageDescriptorSize`

- `tensorDescriptorSize`

However, for some specific use cases it is useful to be able to pack specific descriptors into memory more tightly than this when the implementation allows for this.

To query the size of heap descriptor for a specific VkDescriptorType, call:

    // Provided by VK_EXT_descriptor_heap
    VkDeviceSize vkGetPhysicalDeviceDescriptorSizeEXT(
        VkPhysicalDevice                            physicalDevice,
        VkDescriptorType                            descriptorType);

- `physicalDevice` is the physical device from which to query the descriptor sizes.

- `descriptorType` is a VkDescriptorType specifying the type of heap descriptor to query the size for.

The return value of this function will be a VkDeviceSize indicating the size in bytes (N) of a heap descriptor with a type equal to `descriptorType`. When a descriptor of this type is written by vkWriteResourceDescriptorsEXT or vkWriteSamplerDescriptorsEXT, only the first N bytes are written; the rest will not be accessed and can be safely discarded when copying descriptors around. Additionally, those first N bytes are the only bytes that will be accessed when the descriptor is accessed in the shader. N will never be larger than the applicable limits in VkPhysicalDeviceDescriptorHeapTensorPropertiesARM or VkPhysicalDeviceDescriptorHeapPropertiesEXT.

Note | Values returned by this function have other requirements, so for example may not be power-of-two values.

Note | This command is not intended for general use, and is for tools that already take advantage of tighter packing with other similar features (e.g. `VK_EXT_descriptor_buffer`) to optimize accesses in some cases. Applications can safely ignore this function and are advised to do so, to avoid depending on non-portable packing.

Valid Usage

- VUID-vkGetPhysicalDeviceDescriptorSizeEXT-type-11362
  `type` must be one of VK_DESCRIPTOR_TYPE_SAMPLER, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER, VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, VK_DESCRIPTOR_TYPE_SAMPLE_WEIGHT_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_BLOCK_MATCH_IMAGE_QCOM, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR, VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_PARTITIONED_ACCELERATION_STRUCTURE_NV, VK_DESCRIPTOR_TYPE_TENSOR_ARM, or VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT

Valid Usage (Implicit)

- VUID-vkGetPhysicalDeviceDescriptorSizeEXT-physicalDevice-parameter
  `physicalDevice` must be a valid VkPhysicalDevice handle

- VUID-vkGetPhysicalDeviceDescriptorSizeEXT-descriptorType-parameter
  `descriptorType` must be a valid VkDescriptorType value