C Specification
The type of descriptors in a descriptor set is specified by
VkWriteDescriptorSet::descriptorType
, which must be one of the
values:
typedef enum VkDescriptorType {
VK_DESCRIPTOR_TYPE_SAMPLER = 0,
VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER = 1,
VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE = 2,
VK_DESCRIPTOR_TYPE_STORAGE_IMAGE = 3,
VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER = 4,
VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER = 5,
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER = 6,
VK_DESCRIPTOR_TYPE_STORAGE_BUFFER = 7,
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC = 8,
VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC = 9,
VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT = 10,
VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT = 1000138000,
VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV = 1000165000,
VK_DESCRIPTOR_TYPE_MAX_ENUM = 0x7FFFFFFF
} VkDescriptorType;
Description
-
VK_DESCRIPTOR_TYPE_SAMPLER
specifies a sampler descriptor. -
VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
specifies a combined image sampler descriptor. -
VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE
specifies a sampled image descriptor. -
VK_DESCRIPTOR_TYPE_STORAGE_IMAGE
specifies a storage image descriptor. -
VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER
specifies a uniform texel buffer descriptor. -
VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
specifies a storage texel buffer descriptor. -
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
specifies a uniform buffer descriptor. -
VK_DESCRIPTOR_TYPE_STORAGE_BUFFER
specifies a storage buffer descriptor. -
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
specifies a dynamic uniform buffer descriptor. -
VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
specifies a dynamic storage buffer descriptor. -
VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT
specifies an input attachment descriptor. -
VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT
specifies an inline uniform block.
When a descriptor set is updated via elements of VkWriteDescriptorSet,
members of pImageInfo
, pBufferInfo
and pTexelBufferView
are only accessed by the implementation when they correspond to descriptor
type being defined - otherwise they are ignored.
The members accessed are as follows for each descriptor type:
-
For
VK_DESCRIPTOR_TYPE_SAMPLER
, only thesampler
member of each element of VkWriteDescriptorSet::pImageInfo
is accessed. -
For
VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE
,VK_DESCRIPTOR_TYPE_STORAGE_IMAGE
, orVK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT
, only theimageView
andimageLayout
members of each element of VkWriteDescriptorSet::pImageInfo
are accessed. -
For
VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER
, all members of each element of VkWriteDescriptorSet::pImageInfo
are accessed. -
For
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER
,VK_DESCRIPTOR_TYPE_STORAGE_BUFFER
,VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC
, orVK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC
, all members of each element of VkWriteDescriptorSet::pBufferInfo
are accessed. -
For
VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER
orVK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER
, each element of VkWriteDescriptorSet::pTexelBufferView
is accessed.
When updating descriptors with a descriptorType
of
VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT
, none of the
pImageInfo
, pBufferInfo
, or pTexelBufferView
members are
accessed, instead the source data of the descriptor update operation is
taken from the instance of VkWriteDescriptorSetInlineUniformBlockEXT
in the pNext
chain of VkWriteDescriptorSet
.
When updating descriptors with a descriptorType
of
VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV
, none of the
pImageInfo
, pBufferInfo
, or pTexelBufferView
members are
accessed, instead the source data of the descriptor update operation is
taken from the instance of VkWriteDescriptorSetAccelerationStructureNV
in the pNext
chain of VkWriteDescriptorSet
.
See Also
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) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.