# VkPhysicalDeviceDescriptorIndexingFeatures(3) Manual Page

## Name

VkPhysicalDeviceDescriptorIndexingFeatures - Structure describing descriptor indexing features that can be supported by an implementation

## C Specification

The `VkPhysicalDeviceDescriptorIndexingFeatures` structure is defined as:

    typedef struct VkPhysicalDeviceDescriptorIndexingFeatures {
        VkStructureType    sType;
        void*              pNext;
        VkBool32           shaderInputAttachmentArrayDynamicIndexing;
        VkBool32           shaderUniformTexelBufferArrayDynamicIndexing;
        VkBool32           shaderStorageTexelBufferArrayDynamicIndexing;
        VkBool32           shaderUniformBufferArrayNonUniformIndexing;
        VkBool32           shaderSampledImageArrayNonUniformIndexing;
        VkBool32           shaderStorageBufferArrayNonUniformIndexing;
        VkBool32           shaderStorageImageArrayNonUniformIndexing;
        VkBool32           shaderInputAttachmentArrayNonUniformIndexing;
        VkBool32           shaderUniformTexelBufferArrayNonUniformIndexing;
        VkBool32           shaderStorageTexelBufferArrayNonUniformIndexing;
        VkBool32           descriptorBindingUniformBufferUpdateAfterBind;
        VkBool32           descriptorBindingSampledImageUpdateAfterBind;
        VkBool32           descriptorBindingStorageImageUpdateAfterBind;
        VkBool32           descriptorBindingStorageBufferUpdateAfterBind;
        VkBool32           descriptorBindingUniformTexelBufferUpdateAfterBind;
        VkBool32           descriptorBindingStorageTexelBufferUpdateAfterBind;
        VkBool32           descriptorBindingUpdateUnusedWhilePending;
        VkBool32           descriptorBindingPartiallyBound;
        VkBool32           descriptorBindingVariableDescriptorCount;
        VkBool32           runtimeDescriptorArray;
    } VkPhysicalDeviceDescriptorIndexingFeatures;

or the equivalent

    typedef VkPhysicalDeviceDescriptorIndexingFeatures VkPhysicalDeviceDescriptorIndexingFeaturesEXT;

## Members

The members of the `VkPhysicalDeviceDescriptorIndexingFeatures` structure describe the following features:

## Description

- `shaderInputAttachmentArrayDynamicIndexing` indicates whether arrays of input attachments can be indexed by dynamically uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT` must be indexed only by constant integral expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `InputAttachmentArrayDynamicIndexing` capability.

- `shaderUniformTexelBufferArrayDynamicIndexing` indicates whether arrays of uniform texel buffers can be indexed by dynamically uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER` must be indexed only by constant integral expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `UniformTexelBufferArrayDynamicIndexing` capability.

- `shaderStorageTexelBufferArrayDynamicIndexing` indicates whether arrays of storage texel buffers can be indexed by dynamically uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER` must be indexed only by constant integral expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `StorageTexelBufferArrayDynamicIndexing` capability.

- `shaderUniformBufferArrayNonUniformIndexing` indicates whether arrays of uniform buffers can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER` or `VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `UniformBufferArrayNonUniformIndexing` capability.

- `shaderSampledImageArrayNonUniformIndexing` indicates whether arrays of samplers or sampled images can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_SAMPLER`, `VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER`, or `VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `SampledImageArrayNonUniformIndexing` capability.

- `shaderStorageBufferArrayNonUniformIndexing` indicates whether arrays of storage buffers can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_STORAGE_BUFFER` or `VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `StorageBufferArrayNonUniformIndexing` capability.

- `shaderStorageImageArrayNonUniformIndexing` indicates whether arrays of storage images can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_STORAGE_IMAGE` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `StorageImageArrayNonUniformIndexing` capability.

- `shaderInputAttachmentArrayNonUniformIndexing` indicates whether arrays of input attachments can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `InputAttachmentArrayNonUniformIndexing` capability.

- `shaderUniformTexelBufferArrayNonUniformIndexing` indicates whether arrays of uniform texel buffers can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `UniformTexelBufferArrayNonUniformIndexing` capability.

- `shaderStorageTexelBufferArrayNonUniformIndexing` indicates whether arrays of storage texel buffers can be indexed by non-uniform integer expressions in shader code. If this feature is not enabled, resources with a descriptor type of `VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER` must not be indexed by non-uniform integer expressions when aggregated into arrays in shader code. This also indicates whether shader modules can declare the `StorageTexelBufferArrayNonUniformIndexing` capability.

- `descriptorBindingUniformBufferUpdateAfterBind` indicates whether the implementation supports updating uniform buffer descriptors after a set is bound. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT` must not be used with `VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER`.

- `descriptorBindingSampledImageUpdateAfterBind` indicates whether the implementation supports updating sampled image descriptors after a set is bound. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT` must not be used with `VK_DESCRIPTOR_TYPE_SAMPLER`, `VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER`, or `VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE`.

- `descriptorBindingStorageImageUpdateAfterBind` indicates whether the implementation supports updating storage image descriptors after a set is bound. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT` must not be used with `VK_DESCRIPTOR_TYPE_STORAGE_IMAGE`.

- `descriptorBindingStorageBufferUpdateAfterBind` indicates whether the implementation supports updating storage buffer descriptors after a set is bound. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT` must not be used with `VK_DESCRIPTOR_TYPE_STORAGE_BUFFER`.

- `descriptorBindingUniformTexelBufferUpdateAfterBind` indicates whether the implementation supports updating uniform texel buffer descriptors after a set is bound. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT` must not be used with `VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER`.

- `descriptorBindingStorageTexelBufferUpdateAfterBind` indicates whether the implementation supports updating storage texel buffer descriptors after a set is bound. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT` must not be used with `VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER`.

- `descriptorBindingUpdateUnusedWhilePending` indicates whether the implementation supports updating descriptors while the set is in use. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT` must not be used.

- `descriptorBindingPartiallyBound` indicates whether the implementation supports statically using a descriptor set binding in which some descriptors are not valid. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT` must not be used.

- `descriptorBindingVariableDescriptorCount` indicates whether the implementation supports descriptor sets with a variable-sized last binding. If this feature is not enabled, `VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT` must not be used.

- `runtimeDescriptorArray` indicates whether the implementation supports the SPIR-V `RuntimeDescriptorArray` capability. If this feature is not enabled, descriptors must not be declared in runtime arrays.

If the `VkPhysicalDeviceDescriptorIndexingFeatures` structure is included in the `pNext` chain of VkPhysicalDeviceFeatures2, it is filled with values indicating whether each feature is supported. `VkPhysicalDeviceDescriptorIndexingFeatures` can also be included in the `pNext` chain of VkDeviceCreateInfo to enable features.

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DESCRIPTOR_INDEXING_FEATURES`

## See Also

`VkBool32`, VkStructureType

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.