// Copyright (c) 2015-2019 Khronos Group. This work is licensed under a // Creative Commons Attribution 4.0 International License; see // http://creativecommons.org/licenses/by/4.0/ [[descriptorsets]] = Resource Descriptors A _descriptor_ is an opaque data structure representing a shader resource such as a buffer, buffer view, image view, sampler, or combined image sampler. Descriptors are organised into _descriptor sets_, which are bound during command recording for use in subsequent draw commands. The arrangement of content in each descriptor set is determined by a _descriptor set layout_, which determines what descriptors can be stored within it. The sequence of descriptor set layouts that can: be used by a pipeline is specified in a _pipeline layout_. Each pipeline object can: use up to pname:maxBoundDescriptorSets (see <>) descriptor sets. Shaders access resources via variables decorated with a descriptor set and binding number that link them to a descriptor in a descriptor set. The shader interface mapping to bound descriptor sets is described in the <> section. ifdef::VK_EXT_buffer_device_address[] Shaders can: also access buffers without going through descriptors by using <> to access them through 64-bit addresses. endif::VK_EXT_buffer_device_address[] [[descriptorsets-types]] == Descriptor Types There are a number of different types of descriptor supported by Vulkan, corresponding to different resources or usage. The following sections describe the API definitions of each descriptor type. The mapping of each type to SPIR-V is listed in the <> and <> tables in the <> chapter. [[descriptorsets-storageimage]] === Storage Image A _storage image_ (ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE) is a descriptor type associated with an <> via an <> that load, store, and atomic operations can: be performed on. Storage image loads are supported in all shader stages for image views whose <> contain <>. Stores to storage images are supported in compute shaders for image views whose <> contain <>. Atomic operations on storage images are supported in compute shaders for image views whose <> contain <>. When the <> feature is enabled, stores and atomic operations are also supported for storage images in fragment shaders with the same set of image formats as supported in compute shaders. When the <> feature is enabled, stores and atomic operations are also supported in vertex, tessellation, and geometry shaders with the same set of image formats as supported in compute shaders. The image subresources for a storage image must: be in the ifdef::VK_KHR_shared_presentable_image[] ename:VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR or endif::VK_KHR_shared_presentable_image[] ename:VK_IMAGE_LAYOUT_GENERAL layout in order to access its data in a shader. [[descriptorsets-sampler]] === Sampler A _sampler descriptor_ (ename:VK_DESCRIPTOR_TYPE_SAMPLER) is a descriptor type associated with a <> object, used to control the behavior of <> performed on a <>. [[descriptorsets-sampledimage]] === Sampled Image A _sampled image_ (ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE) is a descriptor type associated with an <> via an <> that <> can: be performed on. Shaders combine a sampled image variable and a sampler variable to perform sampling operations. Sampled images are supported in all shader stages for image views whose <> contain <>. The image subresources for a sampled image must: be in the ifdef::VK_KHR_shared_presentable_image[] ename:VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR, endif::VK_KHR_shared_presentable_image[] ifdef::VK_VERSION_1_1,VK_KHR_maintenance2[] ename:VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL, ename:VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL, endif::VK_VERSION_1_1,VK_KHR_maintenance2[] ename:VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL, ename:VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, or ename:VK_IMAGE_LAYOUT_GENERAL layout in order to access its data in a shader. [[descriptorsets-combinedimagesampler]] === Combined Image Sampler A _combined image sampler_ (ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER) is a single descriptor type associated with both a <> and an <>, combining both a <> and <> descriptor into a single descriptor. ifdef::VK_VERSION_1_1,VK_KHR_sampler_ycbcr_conversion[] If the descriptor refers to a sampler that performs ifndef::VK_EXT_fragment_density_map[] <>, endif::VK_EXT_fragment_density_map[] ifdef::VK_EXT_fragment_density_map[] <> or samples a <>, endif::VK_EXT_fragment_density_map[] the sampler must: only be used to sample the image in the same descriptor. Otherwise, the endif::VK_VERSION_1_1,VK_KHR_sampler_ycbcr_conversion[] ifndef::VK_VERSION_1_1,VK_KHR_sampler_ycbcr_conversion[] ifndef::VK_EXT_fragment_density_map[] The endif::VK_EXT_fragment_density_map[] ifdef::VK_EXT_fragment_density_map[] If the descriptor refers to a sampler that samples a <>, the sampler must: only be used to sample the image in the same descriptor. Otherwise, the endif::VK_EXT_fragment_density_map[] endif::VK_VERSION_1_1,VK_KHR_sampler_ycbcr_conversion[] sampler and image in this type of descriptor can: be used freely with any other samplers and images. The image subresources for a combined image sampler must: be in the ifdef::VK_KHR_shared_presentable_image[] ename:VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR, endif::VK_KHR_shared_presentable_image[] ifdef::VK_VERSION_1_1,VK_KHR_maintenance2[] ename:VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL, ename:VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL, endif::VK_VERSION_1_1,VK_KHR_maintenance2[] ename:VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL, ename:VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, or ename:VK_IMAGE_LAYOUT_GENERAL layout in order to access its data in a shader. [NOTE] .Note ==== On some implementations, it may: be more efficient to sample from an image using a combination of sampler and sampled image that are stored together in the descriptor set in a combined descriptor. ==== [[descriptorsets-uniformtexelbuffer]] === Uniform Texel Buffer A _uniform texel buffer_ (ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER) is a descriptor type associated with a <> via a <> that <> can: be performed on. Uniform texel buffers define a tightly-packed 1-dimensional linear array of texels, with texels going through format conversion when read in a shader in the same way as they are for an image. Load operations from uniform texel buffers are supported in all shader stages for image formats which report support for the <> feature bit via flink:vkGetPhysicalDeviceFormatProperties in slink:VkFormatProperties::pname:bufferFeatures. [[descriptorsets-storagetexelbuffer]] === Storage Texel Buffer A _storage texel buffer_ (ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER) is a descriptor type associated with a <> via a <> that <> can: be performed on. Storage texel buffers define a tightly-packed 1-dimensional linear array of texels, with texels going through format conversion when read in a shader in the same way as they are for an image. Unlike <>, these buffers can also be written to in the same way as for <>. Storage texel buffer loads are supported in all shader stages for texel buffer formats which report support for the <> feature bit via flink:vkGetPhysicalDeviceFormatProperties in slink:VkFormatProperties::pname:bufferFeatures. Stores to storage texel buffers are supported in compute shaders for texel buffer formats which report support for the ename:VK_FORMAT_FEATURE_STORAGE_TEXEL_BUFFER_BIT feature via flink:vkGetPhysicalDeviceFormatProperties in slink:VkFormatProperties::pname:bufferFeatures. Atomic operations on storage texel buffers are supported in compute shaders for texel buffer formats which report support for the <> feature via flink:vkGetPhysicalDeviceFormatProperties in slink:VkFormatProperties::pname:bufferFeatures. When the <> feature is enabled, stores and atomic operations are also supported for storage texel buffers in fragment shaders with the same set of texel buffer formats as supported in compute shaders. When the <> feature is enabled, stores and atomic operations are also supported in vertex, tessellation, and geometry shaders with the same set of texel buffer formats as supported in compute shaders. [[descriptorsets-storagebuffer]] === Storage Buffer A _storage buffer_ (ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER) is a descriptor type associated with a <> directly, described in a shader as a structure with various members that load, store, and atomic operations can: be performed on. [NOTE] .Note ==== Atomic operations can: only be performed on members of certain types as defined in the <>. ==== [[descriptorsets-uniformbuffer]] === Uniform Buffer A _uniform buffer_ (ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER) is a descriptor type associated with a <> directly, described in a shader as a structure with various members that load operations can: be performed on. [[descriptorsets-uniformbufferdynamic]] === Dynamic Uniform Buffer A _dynamic uniform buffer_ (ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC) is almost identical to a <>, and differs only in how the offset into the buffer is specified. The base offset calculated by the slink:VkDescriptorBufferInfo when initially <> is added to a <> when binding the descriptor set. [[descriptorsets-storagebufferdynamic]] === Dynamic Storage Buffer A _dynamic storage buffer_ (ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC) is almost identical to a <>, and differs only in how the offset into the buffer is specified. The base offset calculated by the slink:VkDescriptorBufferInfo when initially <> is added to a <> when binding the descriptor set. ifdef::VK_EXT_inline_uniform_block[] [[descriptorsets-inlineuniformblock]] === Inline Uniform Block An _inline uniform block_ (ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT) is almost identical to a <>, and differs only in taking its storage directly from the encompassing descriptor set instead of being backed by buffer memory. It is typically used to access a small set of constant data that does not require the additional flexibility provided by the indirection enabled when using a uniform buffer where the descriptor and the referenced buffer memory are decoupled. Compared to push constants, they allow reusing the same set of constant data across multiple disjoint sets of draw and dispatch commands. Inline uniform block descriptors cannot: be aggregated into arrays. Instead, the array size specified for an inline uniform block descriptor binding specifies the binding's capacity in bytes. endif::VK_EXT_inline_uniform_block[] [[descriptorsets-inputattachment]] === Input Attachment An _input attachment_ (ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT) is a descriptor type associated with an <> via an <> that can: be used for <> load operations in fragment shaders. All image formats that are supported for color attachments (ename:VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT) or depth/stencil attachments (ename:VK_FORMAT_FEATURE_DEPTH_STENCIL_ATTACHMENT_BIT) for a given image tiling mode are also supported for input attachments. The image subresources for an input attachment must: be in the ifdef::VK_KHR_shared_presentable_image[] ename:VK_IMAGE_LAYOUT_SHARED_PRESENT_KHR, endif::VK_KHR_shared_presentable_image[] ifdef::VK_VERSION_1_1,VK_KHR_maintenance2[] ename:VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL, ename:VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL, endif::VK_VERSION_1_1,VK_KHR_maintenance2[] ename:VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL, ename:VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL, or ename:VK_IMAGE_LAYOUT_GENERAL layout in order to access its data in a shader. ifdef::VK_NV_ray_tracing[] [[descriptorsets-accelerationstructure]] === Acceleration Structure An _acceleration structure_ (ename:VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV) is a descriptor type that is used to retrieve scene geometry from within shaders bound to ray tracing pipelines. Shaders have read-only access to the memory. endif::VK_NV_ray_tracing[] [[descriptorsets-sets]] == Descriptor Sets Descriptors are grouped together into descriptor set objects. A descriptor set object is an opaque object that contains storage for a set of descriptors, where the types and number of descriptors is defined by a descriptor set layout. The layout object may: be used to define the association of each descriptor binding with memory or other implementation resources. The layout is used both for determining the resources that need to be associated with the descriptor set, and determining the interface between shader stages and shader resources. [[descriptorsets-setlayout]] === Descriptor Set Layout [open,refpage='VkDescriptorSetLayout',desc='Opaque handle to a descriptor set layout object',type='handles'] -- A descriptor set layout object is defined by an array of zero or more descriptor bindings. Each individual descriptor binding is specified by a descriptor type, a count (array size) of the number of descriptors in the binding, a set of shader stages that can: access the binding, and (if using immutable samplers) an array of sampler descriptors. Descriptor set layout objects are represented by sname:VkDescriptorSetLayout handles: include::{generated}/api/handles/VkDescriptorSetLayout.txt[] -- [open,refpage='vkCreateDescriptorSetLayout',desc='Create a new descriptor set layout',type='protos'] -- To create descriptor set layout objects, call: include::{generated}/api/protos/vkCreateDescriptorSetLayout.txt[] * pname:device is the logical device that creates the descriptor set layout. * pname:pCreateInfo is a pointer to an instance of the slink:VkDescriptorSetLayoutCreateInfo structure specifying the state of the descriptor set layout object. * pname:pAllocator controls host memory allocation as described in the <> chapter. * pname:pSetLayout points to a slink:VkDescriptorSetLayout handle in which the resulting descriptor set layout object is returned. include::{generated}/validity/protos/vkCreateDescriptorSetLayout.txt[] -- [open,refpage='VkDescriptorSetLayoutCreateInfo',desc='Structure specifying parameters of a newly created descriptor set layout',type='structs'] -- Information about the descriptor set layout is passed in an instance of the sname:VkDescriptorSetLayoutCreateInfo structure: include::{generated}/api/structs/VkDescriptorSetLayoutCreateInfo.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:flags is a bitmask ifdef::VK_KHR_push_descriptor[] of elink:VkDescriptorSetLayoutCreateFlagBits endif::VK_KHR_push_descriptor[] specifying options for descriptor set layout creation. * pname:bindingCount is the number of elements in pname:pBindings. * pname:pBindings is a pointer to an array of slink:VkDescriptorSetLayoutBinding structures. .Valid Usage **** * [[VUID-VkDescriptorSetLayoutCreateInfo-binding-00279]] The slink:VkDescriptorSetLayoutBinding::pname:binding members of the elements of the pname:pBindings array must: each have different values. ifdef::VK_KHR_push_descriptor[] * [[VUID-VkDescriptorSetLayoutCreateInfo-flags-00280]] If pname:flags contains ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR, then all elements of pname:pBindings must: not have a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorSetLayoutCreateInfo-flags-02208]] If pname:flags contains ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR, then all elements of pname:pBindings must: not have a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT endif::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorSetLayoutCreateInfo-flags-00281]] If pname:flags contains ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR, then the total number of elements of all bindings must: be less than or equal to slink:VkPhysicalDevicePushDescriptorPropertiesKHR::pname:maxPushDescriptors endif::VK_KHR_push_descriptor[] ifdef::VK_EXT_descriptor_indexing[] * [[VUID-VkDescriptorSetLayoutCreateInfo-flags-03000]] If any binding has the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT bit set, pname:flags must: include ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT * [[VUID-VkDescriptorSetLayoutCreateInfo-descriptorType-03001]] If any binding has the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT bit set, then all bindings must: not have pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC endif::VK_EXT_descriptor_indexing[] **** include::{generated}/validity/structs/VkDescriptorSetLayoutCreateInfo.txt[] -- [open,refpage='VkDescriptorSetLayoutCreateFlagBits',desc='Bitmask specifying descriptor set layout properties',type='enums'] -- Bits which can: be set in slink:VkDescriptorSetLayoutCreateInfo::pname:flags to specify options for descriptor set layout are: include::{generated}/api/enums/VkDescriptorSetLayoutCreateFlagBits.txt[] ifdef::VK_KHR_push_descriptor[] * ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR specifies that descriptor sets must: not be allocated using this layout, and descriptors are instead pushed by flink:vkCmdPushDescriptorSetKHR. endif::VK_KHR_push_descriptor[] ifdef::VK_EXT_descriptor_indexing[] * ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT specifies that descriptor sets using this layout must: be allocated from a descriptor pool created with the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT bit set. Descriptor set layouts created with this bit set have alternate limits for the maximum number of descriptors per-stage and per-pipeline layout. The non-UpdateAfterBind limits only count descriptors in sets created without this flag. The UpdateAfterBind limits count all descriptors, but the limits may: be higher than the non-UpdateAfterBind limits. endif::VK_EXT_descriptor_indexing[] ifndef::VK_KHR_push_descriptor[] [NOTE] .Note ==== All bits for this type are defined by extensions, and none of those extensions are enabled in this build of the specification. ==== endif::VK_KHR_push_descriptor[] -- [open,refpage='VkDescriptorSetLayoutCreateFlags',desc='Bitmask of VkDescriptorSetLayoutCreateFlagBits',type='flags'] -- include::{generated}/api/flags/VkDescriptorSetLayoutCreateFlags.txt[] tname:VkDescriptorSetLayoutCreateFlags is a bitmask type for setting a mask of zero or more elink:VkDescriptorSetLayoutCreateFlagBits. -- [open,refpage='VkDescriptorSetLayoutBinding',desc='Structure specifying a descriptor set layout binding',type='structs'] -- The sname:VkDescriptorSetLayoutBinding structure is defined as: include::{generated}/api/structs/VkDescriptorSetLayoutBinding.txt[] * pname:binding is the binding number of this entry and corresponds to a resource of the same binding number in the shader stages. * pname:descriptorType is a elink:VkDescriptorType specifying which type of resource descriptors are used for this binding. * pname:descriptorCount is the number of descriptors contained in the binding, accessed in a shader as an array ifdef::VK_EXT_inline_uniform_block[] , except if pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT in which case pname:descriptorCount is the size in bytes of the inline uniform block endif::VK_EXT_inline_uniform_block[] . If pname:descriptorCount is zero this binding entry is reserved and the resource must: not be accessed from any stage via this binding within any pipeline using the set layout. * pname:stageFlags member is a bitmask of elink:VkShaderStageFlagBits specifying which pipeline shader stages can: access a resource for this binding. ename:VK_SHADER_STAGE_ALL is a shorthand specifying that all defined shader stages, including any additional stages defined by extensions, can: access the resource. + If a shader stage is not included in pname:stageFlags, then a resource must: not be accessed from that stage via this binding within any pipeline using the set layout. Other than input attachments which are limited to the fragment shader, there are no limitations on what combinations of stages can: use a descriptor binding, and in particular a binding can: be used by both graphics stages and the compute stage. * pname:pImmutableSamplers affects initialization of samplers. If pname:descriptorType specifies a ename:VK_DESCRIPTOR_TYPE_SAMPLER or ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER type descriptor, then pname:pImmutableSamplers can: be used to initialize a set of _immutable samplers_. Immutable samplers are permanently bound into the set layout; later binding a sampler into an immutable sampler slot in a descriptor set is not allowed. If pname:pImmutableSamplers is not `NULL`, then it is considered to be a pointer to an array of sampler handles that will be consumed by the set layout and used for the corresponding binding. If pname:pImmutableSamplers is `NULL`, then the sampler slots are dynamic and sampler handles must: be bound into descriptor sets using this layout. If pname:descriptorType is not one of these descriptor types, then pname:pImmutableSamplers is ignored. The above layout definition allows the descriptor bindings to be specified sparsely such that not all binding numbers between 0 and the maximum binding number need to be specified in the pname:pBindings array. Bindings that are not specified have a pname:descriptorCount and pname:stageFlags of zero, and the value of pname:descriptorType is undefined:. However, all binding numbers between 0 and the maximum binding number in the slink:VkDescriptorSetLayoutCreateInfo::pname:pBindings array may: consume memory in the descriptor set layout even if not all descriptor bindings are used, though it should: not consume additional memory from the descriptor pool. [NOTE] .Note ==== The maximum binding number specified should: be as compact as possible to avoid wasted memory. ==== .Valid Usage **** * [[VUID-VkDescriptorSetLayoutBinding-descriptorType-00282]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_SAMPLER or ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, and pname:descriptorCount is not `0` and pname:pImmutableSamplers is not `NULL`, pname:pImmutableSamplers must: be a valid pointer to an array of pname:descriptorCount valid sname:VkSampler handles ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorSetLayoutBinding-descriptorType-02209]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount must: be a multiple of `4` * [[VUID-VkDescriptorSetLayoutBinding-descriptorType-02210]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxInlineUniformBlockSize endif::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorSetLayoutBinding-descriptorCount-00283]] If pname:descriptorCount is not `0`, pname:stageFlags must: be a valid combination of elink:VkShaderStageFlagBits values * [[VUID-VkDescriptorSetLayoutBinding-descriptorType-01510]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT and pname:descriptorCount is not `0`, then pname:stageFlags must: be `0` or ename:VK_SHADER_STAGE_FRAGMENT_BIT **** include::{generated}/validity/structs/VkDescriptorSetLayoutBinding.txt[] -- ifdef::VK_EXT_descriptor_indexing[] [open,refpage='VkDescriptorSetLayoutBindingFlagsCreateInfoEXT',desc='Structure specifying creation flags for descriptor set layout bindings',type='structs'] -- If the pname:pNext chain of a slink:VkDescriptorSetLayoutCreateInfo structure includes a sname:VkDescriptorSetLayoutBindingFlagsCreateInfoEXT structure, then that structure includes an array of flags, one for each descriptor set layout binding. The slink:VkDescriptorSetLayoutBindingFlagsCreateInfoEXT structure is defined as: include::{generated}/api/structs/VkDescriptorSetLayoutBindingFlagsCreateInfoEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:bindingCount is zero or the number of elements in pname:pBindingFlags. * pname:pBindingFlags is a pointer to an array of tlink:VkDescriptorBindingFlagsEXT bitfields, one for each descriptor set layout binding. If pname:bindingCount is zero or if this structure is not in the pname:pNext chain, the tlink:VkDescriptorBindingFlagsEXT for each descriptor set layout binding is considered to be zero. Otherwise, the descriptor set layout binding at slink:VkDescriptorSetLayoutCreateInfo::pname:pBindings[i] uses the flags in pname:pBindingFlags[i]. .Valid Usage **** * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-bindingCount-03002]] If pname:bindingCount is not zero, pname:bindingCount must: equal slink:VkDescriptorSetLayoutCreateInfo::pname:bindingCount ifdef::VK_KHR_push_descriptor[] * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-flags-03003]] If slink:VkDescriptorSetLayoutCreateInfo::pname:flags includes ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR, then all elements of pname:pBindingFlags must: not include ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT, ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT, or ename:VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT_EXT endif::VK_KHR_push_descriptor[] * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-pBindingFlags-03004]] If an element of pname:pBindingFlags includes ename:VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT_EXT, then all other elements of slink:VkDescriptorSetLayoutCreateInfo::pname:pBindings must: have a smaller value of pname:binding * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingUniformBufferUpdateAfterBind-03005]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingUniformBufferUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingSampledImageUpdateAfterBind-03006]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingSampledImageUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, or ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingStorageImageUpdateAfterBind-03007]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingStorageImageUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingStorageBufferUpdateAfterBind-03008]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingStorageBufferUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingUniformTexelBufferUpdateAfterBind-03009]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingUniformTexelBufferUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingStorageTexelBufferUpdateAfterBind-03010]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingStorageTexelBufferUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingInlineUniformBlockUpdateAfterBind-02211]] If slink:VkPhysicalDeviceInlineUniformBlockFeaturesEXT::pname:descriptorBindingInlineUniformBlockUpdateAfterBind is not enabled, all bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT endif::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-None-03011]] All bindings with descriptor type ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC must: not use ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingUpdateUnusedWhilePending-03012]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingUpdateUnusedWhilePending is not enabled, all elements of pname:pBindingFlags must: not include ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingPartiallyBound-03013]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingPartiallyBound is not enabled, all elements of pname:pBindingFlags must: not include ename:VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-descriptorBindingVariableDescriptorCount-03014]] If slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingVariableDescriptorCount is not enabled, all elements of pname:pBindingFlags must: not include ename:VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT_EXT * [[VUID-VkDescriptorSetLayoutBindingFlagsCreateInfoEXT-pBindingFlags-03015]] If an element of pname:pBindingFlags includes ename:VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT_EXT, that element's pname:descriptorType must: not be ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC **** include::{generated}/validity/structs/VkDescriptorSetLayoutBindingFlagsCreateInfoEXT.txt[] -- [open,refpage='VkDescriptorBindingFlagBitsEXT',desc='Bitmask specifying descriptor set layout binding properties',type='enums'] -- Bits which can: be set in each element of slink:VkDescriptorSetLayoutBindingFlagsCreateInfoEXT::pname:pBindingFlags to specify options for the corresponding descriptor set layout binding are: include::{generated}/api/enums/VkDescriptorBindingFlagBitsEXT.txt[] * ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT indicates that if descriptors in this binding are updated between when the descriptor set is bound in a command buffer and when that command buffer is submitted to a queue, then the submission will use the most recently set descriptors for this binding and the updates do not invalidate the command buffer. Descriptor bindings created with this flag are also partially exempt from the external synchronization requirement in ifdef::VK_KHR_descriptor_update_template[] flink:vkUpdateDescriptorSetWithTemplateKHR and endif::VK_KHR_descriptor_update_template[] flink:vkUpdateDescriptorSets. They can: be updated concurrently with the set being bound to a command buffer in another thread, but not concurrently with the set being reset or freed. * ename:VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT_EXT indicates that descriptors in this binding that are not _dynamically used_ need not contain valid descriptors at the time the descriptors are consumed. A descriptor is dynamically used if any shader invocation executes an instruction that performs any memory access using the descriptor. * ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT indicates that descriptors in this binding can: be updated after a command buffer has bound this descriptor set, or while a command buffer that uses this descriptor set is pending execution, as long as the descriptors that are updated are not used by those command buffers. If ename:VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT_EXT is also set, then descriptors can: be updated as long as they are not dynamically used by any shader invocations. If ename:VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT_EXT is not set, then descriptors can: be updated as long as they are not statically used by any shader invocations. * ename:VK_DESCRIPTOR_BINDING_VARIABLE_DESCRIPTOR_COUNT_BIT_EXT indicates that this descriptor binding has a variable size that will be specified when a descriptor set is allocated using this layout. The value of pname:descriptorCount is treated as an upper bound on the size of the binding. This must: only be used for the last binding in the descriptor set layout (i.e. the binding with the largest value of pname:binding). For the purposes of counting against limits such as pname:maxDescriptorSet* and pname:maxPerStageDescriptor*, the full value of pname:descriptorCount is counted ifdef::VK_EXT_inline_uniform_block[] , except for descriptor bindings with a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT where pname:descriptorCount specifies the upper bound on the byte size of the binding, thus it counts against the <> limit instead. endif::VK_EXT_inline_uniform_block[] . [NOTE] .Note ==== Note that while ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT and ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT both involve updates to descriptor sets after they are bound, ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT is a weaker requirement since it is only about descriptors that are not used, whereas ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT requires the implementation to observe updates to descriptors that are used. ==== -- [open,refpage='VkDescriptorBindingFlagsEXT',desc='Bitmask of VkDescriptorBindingFlagBitsEXT',type='flags'] -- include::{generated}/api/flags/VkDescriptorBindingFlagsEXT.txt[] tname:VkDescriptorBindingFlagsEXT is a bitmask type for setting a mask of zero or more elink:VkDescriptorBindingFlagBitsEXT. -- endif::VK_EXT_descriptor_indexing[] ifdef::VK_VERSION_1_1,VK_KHR_maintenance3[] [open,refpage='vkGetDescriptorSetLayoutSupport',desc='Query whether a descriptor set layout can be created',type='protos'] -- To query information about whether a descriptor set layout can: be created, call: ifdef::VK_VERSION_1_1[] include::{generated}/api/protos/vkGetDescriptorSetLayoutSupport.txt[] endif::VK_VERSION_1_1[] ifdef::VK_VERSION_1_1+VK_KHR_maintenance3[or the equivalent command] ifdef::VK_KHR_maintenance3[] include::{generated}/api/protos/vkGetDescriptorSetLayoutSupportKHR.txt[] endif::VK_KHR_maintenance3[] * pname:device is the logical device that would create the descriptor set layout. * pname:pCreateInfo is a pointer to an instance of the slink:VkDescriptorSetLayoutCreateInfo structure specifying the state of the descriptor set layout object. * pname:pSupport points to a slink:VkDescriptorSetLayoutSupport structure in which information about support for the descriptor set layout object is returned. Some implementations have limitations on what fits in a descriptor set which are not easily expressible in terms of existing limits like pname:maxDescriptorSet*, for example if all descriptor types share a limited space in memory but each descriptor is a different size or alignment. This command returns information about whether a descriptor set satisfies this limit. If the descriptor set layout satisfies the slink:VkPhysicalDeviceMaintenance3Properties::pname:maxPerSetDescriptors limit, this command is guaranteed to return ename:VK_TRUE in slink:VkDescriptorSetLayoutSupport::pname:supported. If the descriptor set layout exceeds the slink:VkPhysicalDeviceMaintenance3Properties::pname:maxPerSetDescriptors limit, whether the descriptor set layout is supported is implementation-dependent and may: depend on whether the descriptor sizes and alignments cause the layout to exceed an internal limit. This command does not consider other limits such as pname:maxPerStageDescriptor*, and so a descriptor set layout that is supported according to this command must: still satisfy the pipeline layout limits such as pname:maxPerStageDescriptor* in order to be used in a pipeline layout. [NOTE] .Note ==== This is a sname:VkDevice query rather than sname:VkPhysicalDevice because the answer may: depend on enabled features. ==== include::{generated}/validity/protos/vkGetDescriptorSetLayoutSupport.txt[] -- [open,refpage='VkDescriptorSetLayoutSupport',desc='Structure returning information about whether a descriptor set layout can be supported',type='structs'] -- Information about support for the descriptor set layout is returned in an instance of the sname:VkDescriptorSetLayoutSupport structure: include::{generated}/api/structs/VkDescriptorSetLayoutSupport.txt[] ifdef::VK_KHR_maintenance3[] or the equivalent include::{generated}/api/structs/VkDescriptorSetLayoutSupportKHR.txt[] endif::VK_KHR_maintenance3[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:supported specifies whether the descriptor set layout can: be created. pname:supported is set to ename:VK_TRUE if the descriptor set can: be created, or else is set to ename:VK_FALSE. include::{generated}/validity/structs/VkDescriptorSetLayoutSupport.txt[] -- endif::VK_VERSION_1_1,VK_KHR_maintenance3[] ifdef::VK_EXT_descriptor_indexing[] [open,refpage='VkDescriptorSetVariableDescriptorCountLayoutSupportEXT',desc='Structure returning information about whether a descriptor set layout can be supported',type='structs'] -- If the pname:pNext chain of a slink:VkDescriptorSetLayoutSupport structure includes a sname:VkDescriptorSetVariableDescriptorCountLayoutSupportEXT structure, then that structure returns additional information about whether the descriptor set layout is supported. include::{generated}/api/structs/VkDescriptorSetVariableDescriptorCountLayoutSupportEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:maxVariableDescriptorCount indicates the maximum number of descriptors supported in the highest numbered binding of the layout, if that binding is variable-sized. ifdef::VK_EXT_inline_uniform_block[] If the highest numbered binding of the layout has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:maxVariableDescriptorCount indicates the maximum byte size supported for the binding, if that binding is variable-sized. endif::VK_EXT_inline_uniform_block[] If the create info includes a variable-sized descriptor, then pname:supported is determined assuming the requested size of the variable-sized descriptor, and pname:maxVariableDescriptorCount is set to the maximum size of that descriptor that can: be successfully created (which is greater than or equal to the requested size passed in). If the create info does not include a variable-sized descriptor or if the slink:VkPhysicalDeviceDescriptorIndexingFeaturesEXT::pname:descriptorBindingVariableDescriptorCount feature is not enabled, then pname:maxVariableDescriptorCount is set to zero. For the purposes of this command, a variable-sized descriptor binding with a pname:descriptorCount of zero is treated as if the pname:descriptorCount is one, and thus the binding is not ignored and the maximum descriptor count will be returned. If the layout is not supported, then the value written to pname:maxVariableDescriptorCount is undefined:. include::{generated}/validity/structs/VkDescriptorSetVariableDescriptorCountLayoutSupportEXT.txt[] -- endif::VK_EXT_descriptor_indexing[] The following examples show a shader snippet using two descriptor sets, and application code that creates corresponding descriptor set layouts. .GLSL example [source,glsl] --------------------------------------------------- // // binding to a single sampled image descriptor in set 0 // layout (set=0, binding=0) uniform texture2D mySampledImage; // // binding to an array of sampled image descriptors in set 0 // layout (set=0, binding=1) uniform texture2D myArrayOfSampledImages[12]; // // binding to a single uniform buffer descriptor in set 1 // layout (set=1, binding=0) uniform myUniformBuffer { vec4 myElement[32]; }; --------------------------------------------------- .SPIR-V example [source,spirv] --------------------------------------------------- ... %1 = OpExtInstImport "GLSL.std.450" ... OpName %9 "mySampledImage" OpName %14 "myArrayOfSampledImages" OpName %18 "myUniformBuffer" OpMemberName %18 0 "myElement" OpName %20 "" OpDecorate %9 DescriptorSet 0 OpDecorate %9 Binding 0 OpDecorate %14 DescriptorSet 0 OpDecorate %14 Binding 1 OpDecorate %17 ArrayStride 16 OpMemberDecorate %18 0 Offset 0 OpDecorate %18 Block OpDecorate %20 DescriptorSet 1 OpDecorate %20 Binding 0 %2 = OpTypeVoid %3 = OpTypeFunction %2 %6 = OpTypeFloat 32 %7 = OpTypeImage %6 2D 0 0 0 1 Unknown %8 = OpTypePointer UniformConstant %7 %9 = OpVariable %8 UniformConstant %10 = OpTypeInt 32 0 %11 = OpConstant %10 12 %12 = OpTypeArray %7 %11 %13 = OpTypePointer UniformConstant %12 %14 = OpVariable %13 UniformConstant %15 = OpTypeVector %6 4 %16 = OpConstant %10 32 %17 = OpTypeArray %15 %16 %18 = OpTypeStruct %17 %19 = OpTypePointer Uniform %18 %20 = OpVariable %19 Uniform ... --------------------------------------------------- .API example [source,c++] --------------------------------------------------- VkResult myResult; const VkDescriptorSetLayoutBinding myDescriptorSetLayoutBinding[] = { // binding to a single image descriptor { 0, // binding VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, // descriptorType 1, // descriptorCount VK_SHADER_STAGE_FRAGMENT_BIT, // stageFlags NULL // pImmutableSamplers }, // binding to an array of image descriptors { 1, // binding VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, // descriptorType 12, // descriptorCount VK_SHADER_STAGE_FRAGMENT_BIT, // stageFlags NULL // pImmutableSamplers }, // binding to a single uniform buffer descriptor { 0, // binding VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, // descriptorType 1, // descriptorCount VK_SHADER_STAGE_FRAGMENT_BIT, // stageFlags NULL // pImmutableSamplers } }; const VkDescriptorSetLayoutCreateInfo myDescriptorSetLayoutCreateInfo[] = { // Create info for first descriptor set with two descriptor bindings { VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO, // sType NULL, // pNext 0, // flags 2, // bindingCount &myDescriptorSetLayoutBinding[0] // pBindings }, // Create info for second descriptor set with one descriptor binding { VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO, // sType NULL, // pNext 0, // flags 1, // bindingCount &myDescriptorSetLayoutBinding[2] // pBindings } }; VkDescriptorSetLayout myDescriptorSetLayout[2]; // // Create first descriptor set layout // myResult = vkCreateDescriptorSetLayout( myDevice, &myDescriptorSetLayoutCreateInfo[0], NULL, &myDescriptorSetLayout[0]); // // Create second descriptor set layout // myResult = vkCreateDescriptorSetLayout( myDevice, &myDescriptorSetLayoutCreateInfo[1], NULL, &myDescriptorSetLayout[1]); --------------------------------------------------- [open,refpage='vkDestroyDescriptorSetLayout',desc='Destroy a descriptor set layout object',type='protos'] -- To destroy a descriptor set layout, call: include::{generated}/api/protos/vkDestroyDescriptorSetLayout.txt[] * pname:device is the logical device that destroys the descriptor set layout. * pname:descriptorSetLayout is the descriptor set layout to destroy. * pname:pAllocator controls host memory allocation as described in the <> chapter. .Valid Usage **** * [[VUID-vkDestroyDescriptorSetLayout-descriptorSetLayout-00284]] If sname:VkAllocationCallbacks were provided when pname:descriptorSetLayout was created, a compatible set of callbacks must: be provided here * [[VUID-vkDestroyDescriptorSetLayout-descriptorSetLayout-00285]] If no sname:VkAllocationCallbacks were provided when pname:descriptorSetLayout was created, pname:pAllocator must: be `NULL` **** include::{generated}/validity/protos/vkDestroyDescriptorSetLayout.txt[] -- [[descriptorsets-pipelinelayout]] === Pipeline Layouts [open,refpage='VkPipelineLayout',desc='Opaque handle to a pipeline layout object',type='handles'] -- Access to descriptor sets from a pipeline is accomplished through a _pipeline layout_. Zero or more descriptor set layouts and zero or more push constant ranges are combined to form a pipeline layout object which describes the complete set of resources that can: be accessed by a pipeline. The pipeline layout represents a sequence of descriptor sets with each having a specific layout. This sequence of layouts is used to determine the interface between shader stages and shader resources. Each pipeline is created using a pipeline layout. Pipeline layout objects are represented by sname:VkPipelineLayout handles: include::{generated}/api/handles/VkPipelineLayout.txt[] -- [open,refpage='vkCreatePipelineLayout',desc='Creates a new pipeline layout object',type='protos'] -- To create a pipeline layout, call: include::{generated}/api/protos/vkCreatePipelineLayout.txt[] * pname:device is the logical device that creates the pipeline layout. * pname:pCreateInfo is a pointer to an instance of the slink:VkPipelineLayoutCreateInfo structure specifying the state of the pipeline layout object. * pname:pAllocator controls host memory allocation as described in the <> chapter. * pname:pPipelineLayout points to a slink:VkPipelineLayout handle in which the resulting pipeline layout object is returned. include::{generated}/validity/protos/vkCreatePipelineLayout.txt[] -- [open,refpage='VkPipelineLayoutCreateInfo',desc='Structure specifying the parameters of a newly created pipeline layout object',type='structs'] -- The slink:VkPipelineLayoutCreateInfo structure is defined as: include::{generated}/api/structs/VkPipelineLayoutCreateInfo.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:flags is reserved for future use. * pname:setLayoutCount is the number of descriptor sets included in the pipeline layout. * pname:pSetLayouts is a pointer to an array of sname:VkDescriptorSetLayout objects. * pname:pushConstantRangeCount is the number of push constant ranges included in the pipeline layout. * pname:pPushConstantRanges is a pointer to an array of sname:VkPushConstantRange structures defining a set of push constant ranges for use in a single pipeline layout. In addition to descriptor set layouts, a pipeline layout also describes how many push constants can: be accessed by each stage of the pipeline. + [NOTE] .Note ==== Push constants represent a high speed path to modify constant data in pipelines that is expected to outperform memory-backed resource updates. ==== .Valid Usage **** * [[VUID-VkPipelineLayoutCreateInfo-setLayoutCount-00286]] pname:setLayoutCount must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxBoundDescriptorSets ifndef::VK_EXT_descriptor_indexing[] * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-00287]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER accessible to any shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorSamplers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-00288]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER and ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC accessible to any shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorUniformBuffers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-00289]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER and ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC accessible to any shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorStorageBuffers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-00290]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, and ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER accessible to any shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorSampledImages * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-00291]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, and ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER accessible to any shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorStorageImages * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01676]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorInputAttachments ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02212]] The total number of bindings with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxPerStageDescriptorInlineUniformBlocks endif::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01677]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetSamplers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01678]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetUniformBuffers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01679]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetUniformBuffersDynamic * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01680]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetStorageBuffers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01681]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetStorageBuffersDynamic * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01682]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, and ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetSampledImages * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01683]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, and ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetStorageImages * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-01684]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetInputAttachments ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02213]] The total number of bindings with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxDescriptorSetInlineUniformBlocks endif::VK_EXT_inline_uniform_block[] endif::VK_EXT_descriptor_indexing[] ifdef::VK_EXT_descriptor_indexing[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03016]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorSamplers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03017]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER and ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorUniformBuffers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03018]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER and ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorStorageBuffers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03019]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, and ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorSampledImages * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03020]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, and ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorStorageImages * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03021]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPerStageDescriptorInputAttachments ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02214]] The total number of bindings in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxPerStageDescriptorInlineUniformBlocks endif::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03022]] The total number of descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindSamplers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03023]] The total number of descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER and ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindUniformBuffers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03024]] The total number of descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER and ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindStorageBuffers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03025]] The total number of descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, and ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindSampledImages * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03026]] The total number of descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, and ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindStorageImages * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03027]] The total number of descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindInputAttachments ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02215]] The total number of bindings with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT accessible to any given shader stage across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxPerStageDescriptorUpdateAfterBindInlineUniformBlocks endif::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03028]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetSamplers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03029]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetUniformBuffers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03030]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetUniformBuffersDynamic * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03031]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetStorageBuffers * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03032]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetStorageBuffersDynamic * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03033]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, and ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetSampledImages * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03034]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, and ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetStorageImages * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-03035]] The total number of descriptors in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxDescriptorSetInputAttachments ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02216]] The total number of bindings in descriptor set layouts created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxDescriptorSetInlineUniformBlocks endif::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03036]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindSamplers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03037]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindUniformBuffers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03038]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindUniformBuffersDynamic * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03039]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindStorageBuffers * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03040]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindStorageBuffersDynamic * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03041]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, and ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindSampledImages * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03042]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, and ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindStorageImages * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-03043]] The total number of descriptors of the type ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceDescriptorIndexingPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindInputAttachments ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02217]] The total number of bindings with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceInlineUniformBlockPropertiesEXT::pname:maxDescriptorSetUpdateAfterBindInlineUniformBlocks endif::VK_EXT_inline_uniform_block[] endif::VK_EXT_descriptor_indexing[] * [[VUID-VkPipelineLayoutCreateInfo-pPushConstantRanges-00292]] Any two elements of pname:pPushConstantRanges must: not include the same stage in pname:stageFlags ifdef::VK_KHR_push_descriptor[] * [[VUID-VkPipelineLayoutCreateInfo-pSetLayouts-00293]] pname:pSetLayouts must: not contain more than one descriptor set layout that was created with ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR set endif::VK_KHR_push_descriptor[] ifdef::VK_NV_ray_tracing[] * [[VUID-VkPipelineLayoutCreateInfo-descriptorType-02381]] The total number of bindings with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV accessible across all shader stages and across all elements of pname:pSetLayouts must: be less than or equal to sname:VkPhysicalDeviceRayTracingPropertiesNV::pname:maxDescriptorSetAccelerationStructures endif::VK_NV_ray_tracing[] **** include::{generated}/validity/structs/VkPipelineLayoutCreateInfo.txt[] -- [open,refpage='VkPipelineLayoutCreateFlags',desc='Reserved for future use',type='flags'] -- include::{generated}/api/flags/VkPipelineLayoutCreateFlags.txt[] tname:VkPipelineLayoutCreateFlags is a bitmask type for setting a mask, but is currently reserved for future use. -- [open,refpage='VkPushConstantRange',desc='Structure specifying a push constant range',type='structs'] -- The sname:VkPushConstantRange structure is defined as: include::{generated}/api/structs/VkPushConstantRange.txt[] * pname:stageFlags is a set of stage flags describing the shader stages that will access a range of push constants. If a particular stage is not included in the range, then accessing members of that range of push constants from the corresponding shader stage will return undefined: values. * pname:offset and pname:size are the start offset and size, respectively, consumed by the range. Both pname:offset and pname:size are in units of bytes and must: be a multiple of 4. The layout of the push constant variables is specified in the shader. .Valid Usage **** * [[VUID-VkPushConstantRange-offset-00294]] pname:offset must: be less than sname:VkPhysicalDeviceLimits::pname:maxPushConstantsSize * [[VUID-VkPushConstantRange-offset-00295]] pname:offset must: be a multiple of `4` * [[VUID-VkPushConstantRange-size-00296]] pname:size must: be greater than `0` * [[VUID-VkPushConstantRange-size-00297]] pname:size must: be a multiple of `4` * [[VUID-VkPushConstantRange-size-00298]] pname:size must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPushConstantsSize minus pname:offset **** include::{generated}/validity/structs/VkPushConstantRange.txt[] -- Once created, pipeline layouts are used as part of pipeline creation (see <>), as part of binding descriptor sets (see <>), and as part of setting push constants (see <>). Pipeline creation accepts a pipeline layout as input, and the layout may: be used to map (set, binding, arrayElement) tuples to implementation resources or memory locations within a descriptor set. The assignment of implementation resources depends only on the bindings defined in the descriptor sets that comprise the pipeline layout, and not on any shader source. [[descriptorsets-pipelinelayout-consistency]] All resource variables <> in all shaders in a pipeline must: be declared with a (set,binding,arrayElement) that exists in the corresponding descriptor set layout and is of an appropriate descriptor type and includes the set of shader stages it is used by in pname:stageFlags. The pipeline layout can: include entries that are not used by a particular pipeline, or that are dead-code eliminated from any of the shaders. The pipeline layout allows the application to provide a consistent set of bindings across multiple pipeline compiles, which enables those pipelines to be compiled in a way that the implementation may: cheaply switch pipelines without reprogramming the bindings. Similarly, the push constant block declared in each shader (if present) must: only place variables at offsets that are each included in a push constant range with pname:stageFlags including the bit corresponding to the shader stage that uses it. The pipeline layout can: include ranges or portions of ranges that are not used by a particular pipeline, or for which the variables have been dead-code eliminated from any of the shaders. There is a limit on the total number of resources of each type that can: be included in bindings in all descriptor set layouts in a pipeline layout as shown in <>. The "`Total Resources Available`" column gives the limit on the number of each type of resource that can: be included in bindings in all descriptor sets in the pipeline layout. Some resource types count against multiple limits. Additionally, there are limits on the total number of each type of resource that can: be used in any pipeline stage as described in <>. [[descriptorsets-pipelinelayout-limits]] .Pipeline Layout Resource Limits [width="80%",cols="<37,<22",options="header"] |==== | Total Resources Available | Resource Types .2+<.^| pname:maxDescriptorSetSamplers ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindSamplers endif::VK_EXT_descriptor_indexing[] | sampler | combined image sampler .3+<.^| pname:maxDescriptorSetSampledImages ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindSampledImages endif::VK_EXT_descriptor_indexing[] | sampled image | combined image sampler | uniform texel buffer .2+<.^| pname:maxDescriptorSetStorageImages ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindStorageImages endif::VK_EXT_descriptor_indexing[] | storage image | storage texel buffer .2+<.^| pname:maxDescriptorSetUniformBuffers ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindUniformBuffers endif::VK_EXT_descriptor_indexing[] | uniform buffer | uniform buffer dynamic | pname:maxDescriptorSetUniformBuffersDynamic ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindUniformBuffersDynamic endif::VK_EXT_descriptor_indexing[] | uniform buffer dynamic .2+<.^| pname:maxDescriptorSetStorageBuffers ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindStorageBuffers endif::VK_EXT_descriptor_indexing[] | storage buffer | storage buffer dynamic | pname:maxDescriptorSetStorageBuffersDynamic ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindStorageBuffersDynamic endif::VK_EXT_descriptor_indexing[] | storage buffer dynamic | pname:maxDescriptorSetInputAttachments ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindInputAttachments endif::VK_EXT_descriptor_indexing[] | input attachment ifdef::VK_EXT_inline_uniform_block[] | pname:maxDescriptorSetInlineUniformBlocks ifdef::VK_EXT_descriptor_indexing[] or pname:maxDescriptorSetUpdateAfterBindInlineUniformBlocks endif::VK_EXT_descriptor_indexing[] | inline uniform block endif::VK_EXT_inline_uniform_block[] ifdef::VK_NV_ray_tracing[] | pname:maxDescriptorSetAccelerationStructures | acceleration structure endif::VK_NV_ray_tracing[] |==== [open,refpage='vkDestroyPipelineLayout',desc='Destroy a pipeline layout object',type='protos'] -- To destroy a pipeline layout, call: include::{generated}/api/protos/vkDestroyPipelineLayout.txt[] * pname:device is the logical device that destroys the pipeline layout. * pname:pipelineLayout is the pipeline layout to destroy. * pname:pAllocator controls host memory allocation as described in the <> chapter. .Valid Usage **** * [[VUID-vkDestroyPipelineLayout-pipelineLayout-00299]] If sname:VkAllocationCallbacks were provided when pname:pipelineLayout was created, a compatible set of callbacks must: be provided here * [[VUID-vkDestroyPipelineLayout-pipelineLayout-00300]] If no sname:VkAllocationCallbacks were provided when pname:pipelineLayout was created, pname:pAllocator must: be `NULL` * [[VUID-vkDestroyPipelineLayout-pipelineLayout-02004]] pname:pipelineLayout must: not have been passed to any ftext:vkCmd* command for any command buffers that are still in the <> when fname:vkDestroyPipelineLayout is called **** include::{generated}/validity/protos/vkDestroyPipelineLayout.txt[] -- [[descriptorsets-compatibility]] ==== Pipeline Layout Compatibility Two pipeline layouts are defined to be "`compatible for <>`" if they were created with identical push constant ranges. Two pipeline layouts are defined to be "`compatible for set N`" if they were created with _identically defined_ descriptor set layouts for sets zero through N, and if they were created with identical push constant ranges. When binding a descriptor set (see <>) to set number N, if the previously bound descriptor sets for sets zero through N-1 were all bound using compatible pipeline layouts, then performing this binding does not disturb any of the lower numbered sets. If, additionally, the previous bound descriptor set for set N was bound using a pipeline layout compatible for set N, then the bindings in sets numbered greater than N are also not disturbed. Similarly, when binding a pipeline, the pipeline can: correctly access any previously bound descriptor sets which were bound with compatible pipeline layouts, as long as all lower numbered sets were also bound with compatible layouts. Layout compatibility means that descriptor sets can: be bound to a command buffer for use by any pipeline created with a compatible pipeline layout, and without having bound a particular pipeline first. It also means that descriptor sets can: remain valid across a pipeline change, and the same resources will be accessible to the newly bound pipeline. ifdef::implementation-guide[] .Implementor's Note **** A consequence of layout compatibility is that when the implementation compiles a pipeline layout and maps pipeline resources to implementation resources, the mechanism for set N should: only be a function of sets [0..N]. **** endif::implementation-guide[] [NOTE] .Note ==== Place the least frequently changing descriptor sets near the start of the pipeline layout, and place the descriptor sets representing the most frequently changing resources near the end. When pipelines are switched, only the descriptor set bindings that have been invalidated will need to be updated and the remainder of the descriptor set bindings will remain in place. ==== The maximum number of descriptor sets that can: be bound to a pipeline layout is queried from physical device properties (see pname:maxBoundDescriptorSets in <>). .API example [source,c++] --------------------------------------------------- const VkDescriptorSetLayout layouts[] = { layout1, layout2 }; const VkPushConstantRange ranges[] = { { VK_PIPELINE_STAGE_VERTEX_SHADER_BIT, // stageFlags 0, // offset 4 // size }, { VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT, // stageFlags 4, // offset 4 // size }, }; const VkPipelineLayoutCreateInfo createInfo = { VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO, // sType NULL, // pNext 0, // flags 2, // setLayoutCount layouts, // pSetLayouts 2, // pushConstantRangeCount ranges // pPushConstantRanges }; VkPipelineLayout myPipelineLayout; myResult = vkCreatePipelineLayout( myDevice, &createInfo, NULL, &myPipelineLayout); --------------------------------------------------- [[descriptorsets-allocation]] === Allocation of Descriptor Sets [open,refpage='VkDescriptorPool',desc='Opaque handle to a descriptor pool object',type='handles'] -- A _descriptor pool_ maintains a pool of descriptors, from which descriptor sets are allocated. Descriptor pools are externally synchronized, meaning that the application must: not allocate and/or free descriptor sets from the same pool in multiple threads simultaneously. Descriptor pools are represented by sname:VkDescriptorPool handles: include::{generated}/api/handles/VkDescriptorPool.txt[] -- [open,refpage='vkCreateDescriptorPool',desc='Creates a descriptor pool object',type='protos'] -- To create a descriptor pool object, call: include::{generated}/api/protos/vkCreateDescriptorPool.txt[] * pname:device is the logical device that creates the descriptor pool. * pname:pCreateInfo is a pointer to an instance of the slink:VkDescriptorPoolCreateInfo structure specifying the state of the descriptor pool object. * pname:pAllocator controls host memory allocation as described in the <> chapter. * pname:pDescriptorPool points to a slink:VkDescriptorPool handle in which the resulting descriptor pool object is returned. pname:pAllocator controls host memory allocation as described in the <> chapter. The created descriptor pool is returned in pname:pDescriptorPool. include::{generated}/validity/protos/vkCreateDescriptorPool.txt[] -- [open,refpage='VkDescriptorPoolCreateInfo',desc='Structure specifying parameters of a newly created descriptor pool',type='structs'] -- Additional information about the pool is passed in an instance of the sname:VkDescriptorPoolCreateInfo structure: include::{generated}/api/structs/VkDescriptorPoolCreateInfo.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:flags is a bitmask of elink:VkDescriptorPoolCreateFlagBits specifying certain supported operations on the pool. * pname:maxSets is the maximum number of descriptor sets that can: be allocated from the pool. * pname:poolSizeCount is the number of elements in pname:pPoolSizes. * pname:pPoolSizes is a pointer to an array of slink:VkDescriptorPoolSize structures, each containing a descriptor type and number of descriptors of that type to be allocated in the pool. If multiple sname:VkDescriptorPoolSize structures appear in the pname:pPoolSizes array then the pool will be created with enough storage for the total number of descriptors of each type. Fragmentation of a descriptor pool is possible and may: lead to descriptor set allocation failures. A failure due to fragmentation is defined as failing a descriptor set allocation despite the sum of all outstanding descriptor set allocations from the pool plus the requested allocation requiring no more than the total number of descriptors requested at pool creation. Implementations provide certain guarantees of when fragmentation must: not cause allocation failure, as described below. If a descriptor pool has not had any descriptor sets freed since it was created or most recently reset then fragmentation must: not cause an allocation failure (note that this is always the case for a pool created without the ename:VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT bit set). Additionally, if all sets allocated from the pool since it was created or most recently reset use the same number of descriptors (of each type) and the requested allocation also uses that same number of descriptors (of each type), then fragmentation must: not cause an allocation failure. If an allocation failure occurs due to fragmentation, an application can: create an additional descriptor pool to perform further descriptor set allocations. ifdef::VK_EXT_descriptor_indexing[] If pname:flags has the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT bit set, descriptor pool creation may: fail with the error ename:VK_ERROR_FRAGMENTATION_EXT if the total number of descriptors across all pools (including this one) created with this bit set exceeds pname:maxUpdateAfterBindDescriptorsInAllPools, or if fragmentation of the underlying hardware resources occurs. endif::VK_EXT_descriptor_indexing[] .Valid Usage **** * [[VUID-VkDescriptorPoolCreateInfo-maxSets-00301]] pname:maxSets must: be greater than `0` **** include::{generated}/validity/structs/VkDescriptorPoolCreateInfo.txt[] -- ifdef::VK_EXT_inline_uniform_block[] [open,refpage='VkDescriptorPoolInlineUniformBlockCreateInfoEXT',desc='Structure specifying the maximum number of inline uniform block bindings of a newly created descriptor pool',type='structs'] -- In order to be able to allocate descriptor sets having <> bindings the descriptor pool must: be created with specifying the inline uniform block binding capacity of the descriptor pool, in addition to the total inline uniform data capacity in bytes which is specified through an instance of the slink:VkDescriptorPoolSize structure with a pname:descriptorType value of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT. This can: be done by chaining an instance of the sname:VkDescriptorPoolInlineUniformBlockCreateInfoEXT structure to the pname:pNext chain of sname:VkDescriptorPoolCreateInfo. The sname:VkDescriptorPoolInlineUniformBlockCreateInfoEXT structure is defined as: include::{generated}/api/structs/VkDescriptorPoolInlineUniformBlockCreateInfoEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:maxInlineUniformBlockBindings is the number of inline uniform block bindings to allocate. include::{generated}/validity/structs/VkDescriptorPoolInlineUniformBlockCreateInfoEXT.txt[] -- endif::VK_EXT_inline_uniform_block[] [open,refpage='VkDescriptorPoolCreateFlagBits',desc='Bitmask specifying certain supported operations on a descriptor pool',type='enums'] -- Bits which can: be set in slink:VkDescriptorPoolCreateInfo::pname:flags to enable operations on a descriptor pool are: include::{generated}/api/enums/VkDescriptorPoolCreateFlagBits.txt[] * ename:VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT specifies that descriptor sets can: return their individual allocations to the pool, i.e. all of flink:vkAllocateDescriptorSets, flink:vkFreeDescriptorSets, and flink:vkResetDescriptorPool are allowed. Otherwise, descriptor sets allocated from the pool must: not be individually freed back to the pool, i.e. only flink:vkAllocateDescriptorSets and flink:vkResetDescriptorPool are allowed. ifdef::VK_EXT_descriptor_indexing[] * ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT specifies that descriptor sets allocated from this pool can: include bindings with the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT bit set. It is valid to allocate descriptor sets that have bindings that do not set the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT bit from a pool that has ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT set. endif::VK_EXT_descriptor_indexing[] -- [open,refpage='VkDescriptorPoolCreateFlags',desc='Bitmask of VkDescriptorPoolCreateFlagBits',type='flags'] -- include::{generated}/api/flags/VkDescriptorPoolCreateFlags.txt[] tname:VkDescriptorPoolCreateFlags is a bitmask type for setting a mask of zero or more elink:VkDescriptorPoolCreateFlagBits. -- [open,refpage='VkDescriptorPoolSize',desc='Structure specifying descriptor pool size',type='structs'] -- The sname:VkDescriptorPoolSize structure is defined as: include::{generated}/api/structs/VkDescriptorPoolSize.txt[] * pname:type is the type of descriptor. * pname:descriptorCount is the number of descriptors of that type to allocate. ifdef::VK_EXT_inline_uniform_block[] If pname:type is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount is the number of bytes to allocate for descriptors of this type. endif::VK_EXT_inline_uniform_block[] .Valid Usage **** * [[VUID-VkDescriptorPoolSize-descriptorCount-00302]] pname:descriptorCount must: be greater than `0` ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorPoolSize-type-02218]] If pname:type is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount must: be a multiple of `4` endif::VK_EXT_inline_uniform_block[] **** include::{generated}/validity/structs/VkDescriptorPoolSize.txt[] -- [open,refpage='vkDestroyDescriptorPool',desc='Destroy a descriptor pool object',type='protos'] -- To destroy a descriptor pool, call: include::{generated}/api/protos/vkDestroyDescriptorPool.txt[] * pname:device is the logical device that destroys the descriptor pool. * pname:descriptorPool is the descriptor pool to destroy. * pname:pAllocator controls host memory allocation as described in the <> chapter. When a pool is destroyed, all descriptor sets allocated from the pool are implicitly freed and become invalid. Descriptor sets allocated from a given pool do not need to be freed before destroying that descriptor pool. .Valid Usage **** * [[VUID-vkDestroyDescriptorPool-descriptorPool-00303]] All submitted commands that refer to pname:descriptorPool (via any allocated descriptor sets) must: have completed execution * [[VUID-vkDestroyDescriptorPool-descriptorPool-00304]] If sname:VkAllocationCallbacks were provided when pname:descriptorPool was created, a compatible set of callbacks must: be provided here * [[VUID-vkDestroyDescriptorPool-descriptorPool-00305]] If no sname:VkAllocationCallbacks were provided when pname:descriptorPool was created, pname:pAllocator must: be `NULL` **** include::{generated}/validity/protos/vkDestroyDescriptorPool.txt[] -- [open,refpage='VkDescriptorSet',desc='Opaque handle to a descriptor set object',type='handles'] -- Descriptor sets are allocated from descriptor pool objects, and are represented by sname:VkDescriptorSet handles: include::{generated}/api/handles/VkDescriptorSet.txt[] -- [open,refpage='vkAllocateDescriptorSets',desc='Allocate one or more descriptor sets',type='protos'] -- To allocate descriptor sets from a descriptor pool, call: include::{generated}/api/protos/vkAllocateDescriptorSets.txt[] * pname:device is the logical device that owns the descriptor pool. * pname:pAllocateInfo is a pointer to an instance of the slink:VkDescriptorSetAllocateInfo structure describing parameters of the allocation. * pname:pDescriptorSets is a pointer to an array of slink:VkDescriptorSet handles in which the resulting descriptor set objects are returned. The allocated descriptor sets are returned in pname:pDescriptorSets. When a descriptor set is allocated, the initial state is largely uninitialized and all descriptors are undefined:. Descriptors also become undefined: if the underlying resource is destroyed. Descriptor sets containing undefined: descriptors can: still be bound and used, subject to the following conditions: ifdef::VK_EXT_descriptor_indexing[] * For descriptor set bindings created with the ename:VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT_EXT bit set, all descriptors in that binding that are dynamically used must: have been populated before the descriptor set is <>. * For descriptor set bindings created without the ename:VK_DESCRIPTOR_BINDING_PARTIALLY_BOUND_BIT_EXT bit set, all descriptors in that binding that are statically used must: have been populated before the descriptor set is <>. endif::VK_EXT_descriptor_indexing[] ifndef::VK_EXT_descriptor_indexing[] * Descriptors that are <> must: have been populated before the descriptor set is <>. endif::VK_EXT_descriptor_indexing[] ifdef::VK_EXT_inline_uniform_block[] * Descriptor bindings with descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT can: be undefined: when the descriptor set is <>; though values in that block will be undefined:. endif::VK_EXT_inline_uniform_block[] * Entries that are not used by a pipeline can: have undefined: descriptors. ifdef::VK_VERSION_1_1,VK_KHR_maintenance1[] If a call to fname:vkAllocateDescriptorSets would cause the total number of descriptor sets allocated from the pool to exceed the value of slink:VkDescriptorPoolCreateInfo::pname:maxSets used to create pname:pAllocateInfo\->pname:descriptorPool, then the allocation may: fail due to lack of space in the descriptor pool. Similarly, the allocation may: fail due to lack of space if the call to fname:vkAllocateDescriptorSets would cause the number of any given descriptor type to exceed the sum of all the pname:descriptorCount members of each element of slink:VkDescriptorPoolCreateInfo::pname:pPoolSizes with a pname:member equal to that type. ifdef::VK_EXT_inline_uniform_block[] Additionally, the allocation may: also fail if a call to fname:vkAllocateDescriptorSets would cause the total number of inline uniform block bindings allocated from the pool to exceed the value of slink:VkDescriptorPoolInlineUniformBlockCreateInfoEXT::pname:maxInlineUniformBlockBindings used to create the descriptor pool. endif::VK_EXT_inline_uniform_block[] If the allocation fails due to no more space in the descriptor pool, and not because of system or device memory exhaustion, then ename:VK_ERROR_OUT_OF_POOL_MEMORY must: be returned. endif::VK_VERSION_1_1,VK_KHR_maintenance1[] ifndef::VK_VERSION_1_1,VK_KHR_maintenance2[] If an allocation fails due to fragmentation, an indeterminate error is returned with an unspecified error code. Any returned error other than ifdef::VK_VERSION_1_1,VK_KHR_maintenance1[] ename:VK_ERROR_OUT_OF_POOL_MEMORY or endif::VK_VERSION_1_1,VK_KHR_maintenance1[] ename:VK_ERROR_FRAGMENTED_POOL does not imply its usual meaning: applications should: assume that the allocation failed due to fragmentation, and create a new descriptor pool. endif::VK_VERSION_1_1,VK_KHR_maintenance2[] ifdef::VK_VERSION_1_1,VK_KHR_maintenance1[] fname:vkAllocateDescriptorSets can: be used to create multiple descriptor sets. If the creation of any of those descriptor sets fails, then the implementation must: destroy all successfully created descriptor set objects from this command, set all entries of the pname:pDescriptorSets array to dlink:VK_NULL_HANDLE and return the error. endif::VK_VERSION_1_1,VK_KHR_maintenance1[] ifndef::VK_VERSION_1_1,VK_KHR_maintenance2[] [NOTE] .Note ==== Applications should: check for a negative return value when allocating new descriptor sets, assume that any error ifdef::VK_VERSION_1_1,VK_KHR_maintenance1[] other than ename:VK_ERROR_OUT_OF_POOL_MEMORY endif::VK_VERSION_1_1,VK_KHR_maintenance1[] effectively means ename:VK_ERROR_FRAGMENTED_POOL, and try to create a new descriptor pool. If ename:VK_ERROR_FRAGMENTED_POOL is the actual return value, it adds certainty to that decision. The reason for this is that ename:VK_ERROR_FRAGMENTED_POOL was only added in a later version of the 1.0 specification, and so drivers may: return other errors if they were written against earlier versions. To ensure full compatibility with earlier patch versions, these other errors are allowed. ==== endif::VK_VERSION_1_1,VK_KHR_maintenance2[] include::{generated}/validity/protos/vkAllocateDescriptorSets.txt[] -- [open,refpage='VkDescriptorSetAllocateInfo',desc='Structure specifying the allocation parameters for descriptor sets',type='structs'] -- The sname:VkDescriptorSetAllocateInfo structure is defined as: include::{generated}/api/structs/VkDescriptorSetAllocateInfo.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:descriptorPool is the pool which the sets will be allocated from. * pname:descriptorSetCount determines the number of descriptor sets to be allocated from the pool. * pname:pSetLayouts is an array of descriptor set layouts, with each member specifying how the corresponding descriptor set is allocated. .Valid Usage **** ifndef::VK_VERSION_1_1,VK_KHR_maintenance1[] * [[VUID-VkDescriptorSetAllocateInfo-descriptorSetCount-00306]] pname:descriptorSetCount must: not be greater than the number of sets that are currently available for allocation in pname:descriptorPool * [[VUID-VkDescriptorSetAllocateInfo-descriptorPool-00307]] pname:descriptorPool must: have enough free descriptor capacity remaining to allocate the descriptor sets of the specified layouts endif::VK_VERSION_1_1,VK_KHR_maintenance1[] ifdef::VK_KHR_push_descriptor[] * [[VUID-VkDescriptorSetAllocateInfo-pSetLayouts-00308]] Each element of pname:pSetLayouts must: not have been created with ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR set endif::VK_KHR_push_descriptor[] ifdef::VK_EXT_descriptor_indexing[] * [[VUID-VkDescriptorSetAllocateInfo-pSetLayouts-03044]] If any element of pname:pSetLayouts was created with the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT bit set, pname:descriptorPool must: have been created with the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT flag set endif::VK_EXT_descriptor_indexing[] **** include::{generated}/validity/structs/VkDescriptorSetAllocateInfo.txt[] -- ifdef::VK_EXT_descriptor_indexing[] [open,refpage='VkDescriptorSetVariableDescriptorCountAllocateInfoEXT',desc='Structure specifying additional allocation parameters for descriptor sets',type='structs'] -- If the pname:pNext chain of a slink:VkDescriptorSetAllocateInfo structure includes a sname:VkDescriptorSetVariableDescriptorCountAllocateInfoEXT structure, then that structure includes an array of descriptor counts for variable descriptor count bindings, one for each descriptor set being allocated. The sname:VkDescriptorSetVariableDescriptorCountAllocateInfoEXT structure is defined as: include::{generated}/api/structs/VkDescriptorSetVariableDescriptorCountAllocateInfoEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:descriptorSetCount is zero or the number of elements in pname:pDescriptorCounts. * pname:pDescriptorCounts is an array of descriptor counts, with each member specifying the number of descriptors in a variable descriptor count binding in the corresponding descriptor set being allocated. If pname:descriptorSetCount is zero or this structure is not included in the pname:pNext chain, then the variable lengths are considered to be zero. Otherwise, pname:pDescriptorCounts[i] is the number of descriptors in the variable count descriptor binding in the corresponding descriptor set layout. ifdef::VK_EXT_inline_uniform_block[] If the variable count descriptor binding in the corresponding descriptor set layout has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:pDescriptorCounts[i] specifies the binding's capacity in bytes. endif::VK_EXT_inline_uniform_block[] If slink:VkDescriptorSetAllocateInfo::pname:pSetLayouts[i] does not include a variable count descriptor binding, then pname:pDescriptorCounts[i] is ignored. .Valid Usage **** * [[VUID-VkDescriptorSetVariableDescriptorCountAllocateInfoEXT-descriptorSetCount-03045]] If pname:descriptorSetCount is not zero, pname:descriptorSetCount must: equal slink:VkDescriptorSetAllocateInfo::pname:descriptorSetCount * [[VUID-VkDescriptorSetVariableDescriptorCountAllocateInfoEXT-pSetLayouts-03046]] If slink:VkDescriptorSetAllocateInfo::pname:pSetLayouts[i] has a variable descriptor count binding, then pname:pDescriptorCounts[i] must: be less than or equal to the descriptor count specified for that binding when the descriptor set layout was created. **** include::{generated}/validity/structs/VkDescriptorSetVariableDescriptorCountAllocateInfoEXT.txt[] -- endif::VK_EXT_descriptor_indexing[] [open,refpage='vkFreeDescriptorSets',desc='Free one or more descriptor sets',type='protos'] -- To free allocated descriptor sets, call: include::{generated}/api/protos/vkFreeDescriptorSets.txt[] * pname:device is the logical device that owns the descriptor pool. * pname:descriptorPool is the descriptor pool from which the descriptor sets were allocated. * pname:descriptorSetCount is the number of elements in the pname:pDescriptorSets array. * pname:pDescriptorSets is an array of handles to slink:VkDescriptorSet objects. After a successful call to fname:vkFreeDescriptorSets, all descriptor sets in pname:pDescriptorSets are invalid. .Valid Usage **** * [[VUID-vkFreeDescriptorSets-pDescriptorSets-00309]] All submitted commands that refer to any element of pname:pDescriptorSets must: have completed execution * [[VUID-vkFreeDescriptorSets-pDescriptorSets-00310]] pname:pDescriptorSets must: be a valid pointer to an array of pname:descriptorSetCount sname:VkDescriptorSet handles, each element of which must: either be a valid handle or dlink:VK_NULL_HANDLE * [[VUID-vkFreeDescriptorSets-pDescriptorSets-00311]] Each valid handle in pname:pDescriptorSets must: have been allocated from pname:descriptorPool * [[VUID-vkFreeDescriptorSets-descriptorPool-00312]] pname:descriptorPool must: have been created with the ename:VK_DESCRIPTOR_POOL_CREATE_FREE_DESCRIPTOR_SET_BIT flag **** include::{generated}/validity/protos/vkFreeDescriptorSets.txt[] -- [open,refpage='vkResetDescriptorPool',desc='Resets a descriptor pool object',type='protos'] -- To return all descriptor sets allocated from a given pool to the pool, rather than freeing individual descriptor sets, call: include::{generated}/api/protos/vkResetDescriptorPool.txt[] * pname:device is the logical device that owns the descriptor pool. * pname:descriptorPool is the descriptor pool to be reset. * pname:flags is reserved for future use. Resetting a descriptor pool recycles all of the resources from all of the descriptor sets allocated from the descriptor pool back to the descriptor pool, and the descriptor sets are implicitly freed. .Valid Usage **** * [[VUID-vkResetDescriptorPool-descriptorPool-00313]] All uses of pname:descriptorPool (via any allocated descriptor sets) must: have completed execution **** include::{generated}/validity/protos/vkResetDescriptorPool.txt[] -- [open,refpage='VkDescriptorPoolResetFlags',desc='Reserved for future use',type='flags'] -- include::{generated}/api/flags/VkDescriptorPoolResetFlags.txt[] tname:VkDescriptorPoolResetFlags is a bitmask type for setting a mask, but is currently reserved for future use. -- [[descriptorsets-updates]] === Descriptor Set Updates [open,refpage='vkUpdateDescriptorSets',desc='Update the contents of a descriptor set object',type='protos'] -- Once allocated, descriptor sets can: be updated with a combination of write and copy operations. To update descriptor sets, call: include::{generated}/api/protos/vkUpdateDescriptorSets.txt[] * pname:device is the logical device that updates the descriptor sets. * pname:descriptorWriteCount is the number of elements in the pname:pDescriptorWrites array. * pname:pDescriptorWrites is a pointer to an array of slink:VkWriteDescriptorSet structures describing the descriptor sets to write to. * pname:descriptorCopyCount is the number of elements in the pname:pDescriptorCopies array. * pname:pDescriptorCopies is a pointer to an array of slink:VkCopyDescriptorSet structures describing the descriptor sets to copy between. The operations described by pname:pDescriptorWrites are performed first, followed by the operations described by pname:pDescriptorCopies. Within each array, the operations are performed in the order they appear in the array. Each element in the pname:pDescriptorWrites array describes an operation updating the descriptor set using descriptors for resources specified in the structure. Each element in the pname:pDescriptorCopies array is a slink:VkCopyDescriptorSet structure describing an operation copying descriptors between sets. If the pname:dstSet member of any element of pname:pDescriptorWrites or pname:pDescriptorCopies is bound, accessed, or modified by any command that was recorded to a command buffer which is currently in the <>, ifdef::VK_EXT_descriptor_indexing[] and any of the descriptor bindings that are updated were not created with the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT or ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT bits set, endif::VK_EXT_descriptor_indexing[] that command buffer becomes <>. .Valid Usage **** ifndef::VK_EXT_descriptor_indexing[] * [[VUID-vkUpdateDescriptorSets-dstSet-00314]] The pname:dstSet member of each element of pname:pDescriptorWrites or pname:pDescriptorCopies must: not be used by any command that was recorded to a command buffer which is in the <>. endif::VK_EXT_descriptor_indexing[] ifdef::VK_EXT_descriptor_indexing[] * [[VUID-vkUpdateDescriptorSets-None-03047]] Descriptor bindings updated by this command which were created without the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT or ename:VK_DESCRIPTOR_BINDING_UPDATE_UNUSED_WHILE_PENDING_BIT_EXT bits set must: not be used by any command that was recorded to a command buffer which is in the <>. endif::VK_EXT_descriptor_indexing[] **** include::{generated}/validity/protos/vkUpdateDescriptorSets.txt[] -- [open,refpage='VkWriteDescriptorSet',desc='Structure specifying the parameters of a descriptor set write operation',type='structs'] -- The sname:VkWriteDescriptorSet structure is defined as: include::{generated}/api/structs/VkWriteDescriptorSet.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:dstSet is the destination descriptor set to update. * pname:dstBinding is the descriptor binding within that set. * pname:dstArrayElement is the starting element in that array. ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:dstSet and pname:dstBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:dstArrayElement specifies the starting byte offset within the binding. endif::VK_EXT_inline_uniform_block[] * pname:descriptorCount is the number of descriptors to update (the number of elements in pname:pImageInfo, pname:pBufferInfo, or pname:pTexelBufferView ifdef::VK_EXT_inline_uniform_block[] , or a value matching the pname:dataSize member of an instance of slink:VkWriteDescriptorSetInlineUniformBlockEXT in the pname:pNext chain endif::VK_EXT_inline_uniform_block[] ifdef::VK_NV_ray_tracing[] , or a value matching the pname:accelerationStructureCount of an instance of slink:VkWriteDescriptorSetAccelerationStructureNV in the pname:pNext chain endif::VK_NV_ray_tracing[] ). ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:dstSet and pname:dstBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount specifies the number of bytes to update. endif::VK_EXT_inline_uniform_block[] * pname:descriptorType is a elink:VkDescriptorType specifying the type of each descriptor in pname:pImageInfo, pname:pBufferInfo, or pname:pTexelBufferView, as described below. It must: be the same type as that specified in sname:VkDescriptorSetLayoutBinding for pname:dstSet at pname:dstBinding. The type of the descriptor also controls which array the descriptors are taken from. * pname:pImageInfo points to an array of slink:VkDescriptorImageInfo structures or is ignored, as described below. * pname:pBufferInfo points to an array of slink:VkDescriptorBufferInfo structures or is ignored, as described below. * pname:pTexelBufferView points to an array of slink:VkBufferView handles as described in the <> section or is ignored, as described below. Only one of pname:pImageInfo, pname:pBufferInfo, or pname:pTexelBufferView members is used according to the descriptor type specified in the pname:descriptorType member of the containing sname:VkWriteDescriptorSet structure, ifdef::VK_EXT_inline_uniform_block[] or none of them in case pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, in which case the source data for the descriptor writes is taken from the instance of slink:VkWriteDescriptorSetInlineUniformBlockEXT in the pname:pNext chain of sname:VkWriteDescriptorSet, endif::VK_EXT_inline_uniform_block[] ifdef::VK_NV_ray_tracing[] or if pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, in which case the source data for the descriptor writes is taken from the instance of slink:VkWriteDescriptorSetAccelerationStructureNV in the pname:pNext chain of sname:VkWriteDescriptorSet, endif::VK_NV_ray_tracing[] as specified below. [[descriptorsets-updates-consecutive, consecutive binding updates]] If the pname:dstBinding has fewer than pname:descriptorCount array elements remaining starting from pname:dstArrayElement, then the remainder will be used to update the subsequent binding - [eq]#pname:dstBinding+1# starting at array element zero. If a binding has a pname:descriptorCount of zero, it is skipped. This behavior applies recursively, with the update affecting consecutive bindings as needed to update all pname:descriptorCount descriptors. ifdef::VK_EXT_inline_uniform_block[] [NOTE] .Note ==== The same behavior applies to bindings with a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT where pname:descriptorCount specifies the number of bytes to update while pname:dstArrayElement specifies the starting byte offset, thus in this case if the pname:dstBinding has a smaller byte size than the sum of pname:dstArrayElement and pname:descriptorCount, then the remainder will be used to update the subsequent binding - [eq]#pname:dstBinding+1# starting at offset zero. This falls out as a special case of the above rule. ==== endif::VK_EXT_inline_uniform_block[] .Valid Usage **** * [[VUID-VkWriteDescriptorSet-dstBinding-00315]] pname:dstBinding must: be less than or equal to the maximum value of pname:binding of all slink:VkDescriptorSetLayoutBinding structures specified when pname:dstSet's descriptor set layout was created * [[VUID-VkWriteDescriptorSet-dstBinding-00316]] pname:dstBinding must: be a binding with a non-zero pname:descriptorCount * [[VUID-VkWriteDescriptorSet-descriptorCount-00317]] All consecutive bindings updated via a single sname:VkWriteDescriptorSet structure, except those with a pname:descriptorCount of zero, must: have identical pname:descriptorType and pname:stageFlags. * [[VUID-VkWriteDescriptorSet-descriptorCount-00318]] All consecutive bindings updated via a single sname:VkWriteDescriptorSet structure, except those with a pname:descriptorCount of zero, must: all either use immutable samplers or must: all not use immutable samplers. * [[VUID-VkWriteDescriptorSet-descriptorType-00319]] pname:descriptorType must: match the type of pname:dstBinding within pname:dstSet * [[VUID-VkWriteDescriptorSet-dstSet-00320]] pname:dstSet must: be a valid slink:VkDescriptorSet handle * [[VUID-VkWriteDescriptorSet-dstArrayElement-00321]] The sum of pname:dstArrayElement and pname:descriptorCount must: be less than or equal to the number of array elements in the descriptor set binding specified by pname:dstBinding, and all applicable consecutive bindings, as described by <> ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkWriteDescriptorSet-descriptorType-02219]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:dstArrayElement must: be an integer multiple of `4` * [[VUID-VkWriteDescriptorSet-descriptorType-02220]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:descriptorCount must: be an integer multiple of `4` endif::VK_EXT_inline_uniform_block[] * [[VUID-VkWriteDescriptorSet-descriptorType-00322]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, or ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, pname:pImageInfo must: be a valid pointer to an array of pname:descriptorCount valid sname:VkDescriptorImageInfo structures * [[VUID-VkWriteDescriptorSet-descriptorType-00323]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER or ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, pname:pTexelBufferView must: be a valid pointer to an array of pname:descriptorCount valid sname:VkBufferView handles * [[VUID-VkWriteDescriptorSet-descriptorType-00324]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, pname:pBufferInfo must: be a valid pointer to an array of pname:descriptorCount valid sname:VkDescriptorBufferInfo structures * [[VUID-VkWriteDescriptorSet-descriptorType-00325]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_SAMPLER or ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, and pname:dstSet was not allocated with a layout that included immutable samplers for pname:dstBinding with pname:descriptorType, the pname:sampler member of each element of pname:pImageInfo must: be a valid sname:VkSampler object * [[VUID-VkWriteDescriptorSet-descriptorType-00326]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, or ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, the pname:imageView and pname:imageLayout members of each element of pname:pImageInfo must: be a valid sname:VkImageView and elink:VkImageLayout, respectively ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkWriteDescriptorSet-descriptorType-02221]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, the pname:pNext chain must: include a slink:VkWriteDescriptorSetInlineUniformBlockEXT structure whose pname:dataSize member equals pname:descriptorCount endif::VK_EXT_inline_uniform_block[] ifdef::VK_NV_ray_tracing[] * [[VUID-VkWriteDescriptorSet-descriptorType-02382]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, the pname:pNext chain must: include a slink:VkWriteDescriptorSetAccelerationStructureNV structure whose pname:accelerationStructureCount member equals pname:descriptorCount endif::VK_NV_ray_tracing[] ifdef::VULKAN_1_1,VK_KHR_sampler_ycbcr_conversion[] * [[VUID-VkWriteDescriptorSet-descriptorType-01946]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, then the pname:imageView member of each pname:pImageInfo element must: have been created without a sname:VkSamplerYcbcrConversionInfo structure in its pname:pNext chain * [[VUID-VkWriteDescriptorSet-descriptorType-01947]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, and if any element of pname:pImageInfo has a pname:imageView member that was created with a sname:VkSamplerYcbcrConversionInfo structure in its pname:pNext chain, then pname:dstSet must: have been allocated with a layout that included immutable samplers for pname:dstBinding * [[VUID-VkWriteDescriptorSet-descriptorType-01948]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, and pname:dstSet was allocated with a layout that included immutable samplers for pname:dstBinding, then the pname:imageView member of each element of pname:pImageInfo which corresponds to an immutable sampler that enables <> must: have been created with a sname:VkSamplerYcbcrConversionInfo structure in its pname:pNext chain with an _identically defined_ sname:VkSamplerYcbcrConversionInfo to the corresponding immutable sampler endif::VULKAN_1_1,VK_KHR_sampler_ycbcr_conversion[] * [[VUID-VkWriteDescriptorSet-descriptorType-01402]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, for each descriptor that will be accessed via load or store operations the pname:imageLayout member for corresponding elements of pname:pImageInfo must: be ename:VK_IMAGE_LAYOUT_GENERAL * [[VUID-VkWriteDescriptorSet-descriptorType-00327]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER or ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, the pname:offset member of each element of pname:pBufferInfo must: be a multiple of sname:VkPhysicalDeviceLimits::pname:minUniformBufferOffsetAlignment * [[VUID-VkWriteDescriptorSet-descriptorType-00328]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, the pname:offset member of each element of pname:pBufferInfo must: be a multiple of sname:VkPhysicalDeviceLimits::pname:minStorageBufferOffsetAlignment * [[VUID-VkWriteDescriptorSet-descriptorType-00329]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, and the pname:buffer member of any element of pname:pBufferInfo is the handle of a non-sparse buffer, then that buffer must: be bound completely and contiguously to a single sname:VkDeviceMemory object * [[VUID-VkWriteDescriptorSet-descriptorType-00330]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER or ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, the pname:buffer member of each element of pname:pBufferInfo must: have been created with ename:VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT set * [[VUID-VkWriteDescriptorSet-descriptorType-00331]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, the pname:buffer member of each element of pname:pBufferInfo must: have been created with ename:VK_BUFFER_USAGE_STORAGE_BUFFER_BIT set * [[VUID-VkWriteDescriptorSet-descriptorType-00332]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER or ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, the pname:range member of each element of pname:pBufferInfo, or the effective range if pname:range is ename:VK_WHOLE_SIZE, must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxUniformBufferRange * [[VUID-VkWriteDescriptorSet-descriptorType-00333]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, the pname:range member of each element of pname:pBufferInfo, or the effective range if pname:range is ename:VK_WHOLE_SIZE, must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxStorageBufferRange * [[VUID-VkWriteDescriptorSet-descriptorType-00334]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER, the sname:VkBuffer that each element of pname:pTexelBufferView was created from must: have been created with ename:VK_BUFFER_USAGE_UNIFORM_TEXEL_BUFFER_BIT set * [[VUID-VkWriteDescriptorSet-descriptorType-00335]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, the sname:VkBuffer that each element of pname:pTexelBufferView was created from must: have been created with ename:VK_BUFFER_USAGE_STORAGE_TEXEL_BUFFER_BIT set * [[VUID-VkWriteDescriptorSet-descriptorType-00336]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE or ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, the pname:imageView member of each element of pname:pImageInfo must: have been created with the identity swizzle * [[VUID-VkWriteDescriptorSet-descriptorType-00337]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE or ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, the pname:imageView member of each element of pname:pImageInfo must: have been created with ename:VK_IMAGE_USAGE_SAMPLED_BIT set * [[VUID-VkWriteDescriptorSet-descriptorType-01403]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE or ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, the pname:imageLayout member of each element of pname:pImageInfo must: be a member of the list given in <> or <>, corresponding to its type * [[VUID-VkWriteDescriptorSet-descriptorType-00338]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, the pname:imageView member of each element of pname:pImageInfo must: have been created with ename:VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT set * [[VUID-VkWriteDescriptorSet-descriptorType-00339]] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, the pname:imageView member of each element of pname:pImageInfo must: have been created with ename:VK_IMAGE_USAGE_STORAGE_BIT set ifdef::VK_EXT_descriptor_indexing[] * [[VUID-VkWriteDescriptorSet-descriptorCount-03048]] All consecutive bindings updated via a single sname:VkWriteDescriptorSet structure, except those with a pname:descriptorCount of zero, must: have identical elink:VkDescriptorBindingFlagBitsEXT. endif::VK_EXT_descriptor_indexing[] **** include::{generated}/validity/structs/VkWriteDescriptorSet.txt[] -- [open,refpage='VkDescriptorType',desc='Specifies the type of a descriptor in a descriptor set',type='enums'] -- The type of descriptors in a descriptor set is specified by slink:VkWriteDescriptorSet::pname:descriptorType, which must: be one of the values: include::{generated}/api/enums/VkDescriptorType.txt[] * ename:VK_DESCRIPTOR_TYPE_SAMPLER specifies a <>. * ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER specifies a <>. * ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE specifies a <>. * ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE specifies a <>. * ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER specifies a <>. * ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER specifies a <>. * ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER specifies a <>. * ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER specifies a <>. * ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC specifies a <>. * ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC specifies a <>. * ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT specifies an <>. ifdef::VK_EXT_inline_uniform_block[] * ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT specifies an <>. endif::VK_EXT_inline_uniform_block[] When a descriptor set is updated via elements of slink:VkWriteDescriptorSet, members of pname:pImageInfo, pname:pBufferInfo and pname: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 ename:VK_DESCRIPTOR_TYPE_SAMPLER, only the pname:sampler member of each element of slink:VkWriteDescriptorSet::pname:pImageInfo is accessed. * For ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, or ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT, only the pname:imageView and pname:imageLayout members of each element of slink:VkWriteDescriptorSet::pname:pImageInfo are accessed. * For ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, all members of each element of slink:VkWriteDescriptorSet::pname:pImageInfo are accessed. * For ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC, or ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC, all members of each element of slink:VkWriteDescriptorSet::pname:pBufferInfo are accessed. * For ename:VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER or ename:VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, each element of slink:VkWriteDescriptorSet::pname:pTexelBufferView is accessed. ifdef::VK_EXT_inline_uniform_block[] When updating descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, none of the pname:pImageInfo, pname:pBufferInfo, or pname:pTexelBufferView members are accessed, instead the source data of the descriptor update operation is taken from the instance of slink:VkWriteDescriptorSetInlineUniformBlockEXT in the pname:pNext chain of sname:VkWriteDescriptorSet. endif::VK_EXT_inline_uniform_block[] ifdef::VK_NV_ray_tracing[] When updating descriptors with a pname:descriptorType of ename:VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_NV, none of the pname:pImageInfo, pname:pBufferInfo, or pname:pTexelBufferView members are accessed, instead the source data of the descriptor update operation is taken from the instance of slink:VkWriteDescriptorSetAccelerationStructureNV in the pname:pNext chain of sname:VkWriteDescriptorSet. endif::VK_NV_ray_tracing[] -- [open,refpage='VkDescriptorBufferInfo',desc='Structure specifying descriptor buffer info',type='structs'] -- The sname:VkDescriptorBufferInfo structure is defined as: include::{generated}/api/structs/VkDescriptorBufferInfo.txt[] * pname:buffer is the buffer resource. * pname:offset is the offset in bytes from the start of pname:buffer. Access to buffer memory via this descriptor uses addressing that is relative to this starting offset. * pname:range is the size in bytes that is used for this descriptor update, or ename:VK_WHOLE_SIZE to use the range from pname:offset to the end of the buffer. [NOTE] .Note ==== When setting pname:range to ename:VK_WHOLE_SIZE, the effective range must: not be larger than the maximum range for the descriptor type (<> or <>). This means that ename:VK_WHOLE_SIZE is not typically useful in the common case where uniform buffer descriptors are suballocated from a buffer that is much larger than pname:maxUniformBufferRange. ==== For ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC and ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC descriptor types, pname:offset is the base offset from which the dynamic offset is applied and pname:range is the static size used for all dynamic offsets. .Valid Usage **** * [[VUID-VkDescriptorBufferInfo-offset-00340]] pname:offset must: be less than the size of pname:buffer * [[VUID-VkDescriptorBufferInfo-range-00341]] If pname:range is not equal to ename:VK_WHOLE_SIZE, pname:range must: be greater than `0` * [[VUID-VkDescriptorBufferInfo-range-00342]] If pname:range is not equal to ename:VK_WHOLE_SIZE, pname:range must: be less than or equal to the size of pname:buffer minus pname:offset **** include::{generated}/validity/structs/VkDescriptorBufferInfo.txt[] -- [open,refpage='VkDescriptorImageInfo',desc='Structure specifying descriptor image info',type='structs'] -- The sname:VkDescriptorImageInfo structure is defined as: include::{generated}/api/structs/VkDescriptorImageInfo.txt[] * pname:sampler is a sampler handle, and is used in descriptor updates for types ename:VK_DESCRIPTOR_TYPE_SAMPLER and ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER if the binding being updated does not use immutable samplers. * pname:imageView is an image view handle, and is used in descriptor updates for types ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, and ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT. * pname:imageLayout is the layout that the image subresources accessible from pname:imageView will be in at the time this descriptor is accessed. pname:imageLayout is used in descriptor updates for types ename:VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, ename:VK_DESCRIPTOR_TYPE_STORAGE_IMAGE, ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, and ename:VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT. Members of sname:VkDescriptorImageInfo that are not used in an update (as described above) are ignored. .Valid Usage **** ifdef::VK_VERSION_1_1,VK_KHR_maintenance1[] * [[VUID-VkDescriptorImageInfo-imageView-00343]] pname:imageView must: not be 2D or 2D array image view created from a 3D image endif::VK_VERSION_1_1,VK_KHR_maintenance1[] * [[VUID-VkDescriptorImageInfo-imageView-01976]] If pname:imageView is created from a depth/stencil image, the pname:aspectMask used to create the pname:imageView must: include either ename:VK_IMAGE_ASPECT_DEPTH_BIT or ename:VK_IMAGE_ASPECT_STENCIL_BIT but not both. * [[VUID-VkDescriptorImageInfo-imageLayout-00344]] pname:imageLayout must: match the actual elink:VkImageLayout of each subresource accessible from pname:imageView at the time this descriptor is accessed as defined by the <> ifdef::VK_VERSION_1_1,VK_KHR_sampler_ycbcr_conversion[] * [[VUID-VkDescriptorImageInfo-sampler-01564]] If pname:sampler is used and the elink:VkFormat of the image is a <>, the image must: have been created with ename:VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT, and the pname:aspectMask of the pname:imageView must: be ename:VK_IMAGE_ASPECT_PLANE_0_BIT, ename:VK_IMAGE_ASPECT_PLANE_1_BIT or (for three-plane formats only) ename:VK_IMAGE_ASPECT_PLANE_2_BIT endif::VK_VERSION_1_1,VK_KHR_sampler_ycbcr_conversion[] **** include::{generated}/validity/structs/VkDescriptorImageInfo.txt[] -- ifdef::VK_EXT_inline_uniform_block[] [open,refpage='VkWriteDescriptorSetInlineUniformBlockEXT',desc='Structure specifying inline uniform block data',type='structs'] -- If the pname:descriptorType member of slink:VkWriteDescriptorSet is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then the data to write to the descriptor set is specified through an instance of sname:VkWriteDescriptorSetInlineUniformBlockEXT chained to the pname:pNext chain of sname:VkWriteDescriptorSet. The sname:VkWriteDescriptorSetInlineUniformBlockEXT structure is defined as: include::{generated}/api/structs/VkWriteDescriptorSetInlineUniformBlockEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:dataSize is the number of bytes of inline uniform block data pointed to by pname:pData. * pname:pData is a pointer to pname:dataSize number of bytes of data to write to the inline uniform block. .Valid Usage **** * [[VUID-VkWriteDescriptorSetInlineUniformBlockEXT-dataSize-02222]] pname:dataSize must: be an integer multiple of `4` **** include::{generated}/validity/structs/VkWriteDescriptorSetInlineUniformBlockEXT.txt[] -- endif::VK_EXT_inline_uniform_block[] ifdef::VK_NV_ray_tracing[] include::VK_NV_ray_tracing/raytracing-descriptors.txt[] endif::VK_NV_ray_tracing[] [open,refpage='VkCopyDescriptorSet',desc='Structure specifying a copy descriptor set operation',type='structs'] -- The sname:VkCopyDescriptorSet structure is defined as: include::{generated}/api/structs/VkCopyDescriptorSet.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:srcSet, pname:srcBinding, and pname:srcArrayElement are the source set, binding, and array element, respectively. ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:srcSet and pname:srcBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:srcArrayElement specifies the starting byte offset within the binding to copy from. endif::VK_EXT_inline_uniform_block[] * pname:dstSet, pname:dstBinding, and pname:dstArrayElement are the destination set, binding, and array element, respectively. ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:dstSet and pname:dstBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:dstArrayElement specifies the starting byte offset within the binding to copy to. endif::VK_EXT_inline_uniform_block[] * pname:descriptorCount is the number of descriptors to copy from the source to destination. If pname:descriptorCount is greater than the number of remaining array elements in the source or destination binding, those affect consecutive bindings in a manner similar to slink:VkWriteDescriptorSet above. ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:srcSet and pname:srcBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount specifies the number of bytes to copy and the remaining array elements in the source or destination binding refer to the remaining number of bytes in those. endif::VK_EXT_inline_uniform_block[] .Valid Usage **** * [[VUID-VkCopyDescriptorSet-srcBinding-00345]] pname:srcBinding must: be a valid binding within pname:srcSet * [[VUID-VkCopyDescriptorSet-srcArrayElement-00346]] The sum of pname:srcArrayElement and pname:descriptorCount must: be less than or equal to the number of array elements in the descriptor set binding specified by pname:srcBinding, and all applicable consecutive bindings, as described by <> * [[VUID-VkCopyDescriptorSet-dstBinding-00347]] pname:dstBinding must: be a valid binding within pname:dstSet * [[VUID-VkCopyDescriptorSet-dstArrayElement-00348]] The sum of pname:dstArrayElement and pname:descriptorCount must: be less than or equal to the number of array elements in the descriptor set binding specified by pname:dstBinding, and all applicable consecutive bindings, as described by <> * [[VUID-VkCopyDescriptorSet-dstBinding-02632]] The type of pname:dstBinding within pname:dstSet must: be equal to the type of pname:srcBinding within pname:srcSet * [[VUID-VkCopyDescriptorSet-srcSet-00349]] If pname:srcSet is equal to pname:dstSet, then the source and destination ranges of descriptors must: not overlap, where the ranges may: include array elements from consecutive bindings as described by <> ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkCopyDescriptorSet-srcBinding-02223]] If the descriptor type of the descriptor set binding specified by pname:srcBinding is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:srcArrayElement must: be an integer multiple of `4` * [[VUID-VkCopyDescriptorSet-dstBinding-02224]] If the descriptor type of the descriptor set binding specified by pname:dstBinding is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:dstArrayElement must: be an integer multiple of `4` * [[VUID-VkCopyDescriptorSet-srcBinding-02225]] If the descriptor type of the descriptor set binding specified by either pname:srcBinding or pname:dstBinding is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:descriptorCount must: be an integer multiple of `4` endif::VK_EXT_inline_uniform_block[] ifdef::VK_EXT_descriptor_indexing[] * [[VUID-VkCopyDescriptorSet-srcSet-01918]] If pname:srcSet's layout was created with the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT flag set, then pname:dstSet's layout must: also have been created with the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT flag set * [[VUID-VkCopyDescriptorSet-srcSet-01919]] If pname:srcSet's layout was created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT flag set, then pname:dstSet's layout must: also have been created without the ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT_EXT flag set * [[VUID-VkCopyDescriptorSet-srcSet-01920]] If the descriptor pool from which pname:srcSet was allocated was created with the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT flag set, then the descriptor pool from which pname:dstSet was allocated must: also have been created with the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT flag set * [[VUID-VkCopyDescriptorSet-srcSet-01921]] If the descriptor pool from which pname:srcSet was allocated was created without the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT flag set, then the descriptor pool from which pname:dstSet was allocated must: also have been created without the ename:VK_DESCRIPTOR_POOL_CREATE_UPDATE_AFTER_BIND_BIT_EXT flag set endif::VK_EXT_descriptor_indexing[] **** include::{generated}/validity/structs/VkCopyDescriptorSet.txt[] -- ifdef::VK_VERSION_1_1,VK_KHR_descriptor_update_template[] [[descriptorsets-updates-with-template]] === Descriptor Update Templates [open,refpage='VkDescriptorUpdateTemplate',desc='Opaque handle to a descriptor update template',type='handles'] -- A descriptor update template specifies a mapping from descriptor update information in host memory to descriptors in a descriptor set. It is designed to avoid passing redundant information to the driver when frequently updating the same set of descriptors in descriptor sets. Descriptor update template objects are represented by sname:VkDescriptorUpdateTemplate handles: include::{generated}/api/handles/VkDescriptorUpdateTemplate.txt[] ifdef::VK_KHR_descriptor_update_template[] or the equivalent include::{generated}/api/handles/VkDescriptorUpdateTemplateKHR.txt[] endif::VK_KHR_descriptor_update_template[] -- === Descriptor Set Updates with Templates [open,refpage='vkCreateDescriptorUpdateTemplate',desc='Create a new descriptor update template',type='protos'] -- Updating a large sname:VkDescriptorSet array can: be an expensive operation since an application must: specify one slink:VkWriteDescriptorSet structure for each descriptor or descriptor array to update, each of which re-specifies the same state when updating the same descriptor in multiple descriptor sets. For cases when an application wishes to update the same set of descriptors in multiple descriptor sets allocated using the same sname:VkDescriptorSetLayout, flink:vkUpdateDescriptorSetWithTemplate can: be used as a replacement for flink:vkUpdateDescriptorSets. sname:VkDescriptorUpdateTemplate allows implementations to convert a set of descriptor update operations on a single descriptor set to an internal format that, in conjunction with flink:vkUpdateDescriptorSetWithTemplate ifdef::VK_KHR_push_descriptor[] or flink:vkCmdPushDescriptorSetWithTemplateKHR endif::VK_KHR_push_descriptor[] , can: be more efficient compared to calling flink:vkUpdateDescriptorSets ifdef::VK_KHR_push_descriptor[] or flink:vkCmdPushDescriptorSetKHR endif::VK_KHR_push_descriptor[] . The descriptors themselves are not specified in the sname:VkDescriptorUpdateTemplate, rather, offsets into an application provided pointer to host memory are specified, which are combined with a pointer passed to flink:vkUpdateDescriptorSetWithTemplate ifdef::VK_KHR_push_descriptor[] or flink:vkCmdPushDescriptorSetWithTemplateKHR endif::VK_KHR_push_descriptor[] . This allows large batches of updates to be executed without having to convert application data structures into a strictly-defined Vulkan data structure. To create a descriptor update template, call: ifdef::VK_VERSION_1_1[] include::{generated}/api/protos/vkCreateDescriptorUpdateTemplate.txt[] endif::VK_VERSION_1_1[] ifdef::VK_VERSION_1_1+VK_KHR_descriptor_update_template[or the equivalent command] ifdef::VK_KHR_descriptor_update_template[] include::{generated}/api/protos/vkCreateDescriptorUpdateTemplateKHR.txt[] endif::VK_KHR_descriptor_update_template[] * pname:device is the logical device that creates the descriptor update template. * pname:pCreateInfo is a pointer to an instance of the slink:VkDescriptorUpdateTemplateCreateInfo structure specifying the set of descriptors to update with a single call to ifdef::VK_KHR_push_descriptor[] flink:vkCmdPushDescriptorSetWithTemplateKHR or endif::VK_KHR_push_descriptor[] flink:vkUpdateDescriptorSetWithTemplate. * pname:pAllocator controls host memory allocation as described in the <> chapter. * pname:pDescriptorUpdateTemplate points to a sname:VkDescriptorUpdateTemplate handle in which the resulting descriptor update template object is returned. include::{generated}/validity/protos/vkCreateDescriptorUpdateTemplate.txt[] -- [open,refpage='VkDescriptorUpdateTemplateCreateInfo',desc='Structure specifying parameters of a newly created descriptor update template',type='structs'] -- The slink:VkDescriptorUpdateTemplateCreateInfo structure is defined as: include::{generated}/api/structs/VkDescriptorUpdateTemplateCreateInfo.txt[] ifdef::VK_KHR_descriptor_update_template[] or the equivalent include::{generated}/api/structs/VkDescriptorUpdateTemplateCreateInfoKHR.txt[] endif::VK_KHR_descriptor_update_template[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:flags is reserved for future use. * pname:descriptorUpdateEntryCount is the number of elements in the pname:pDescriptorUpdateEntries array. * pname:pDescriptorUpdateEntries is a pointer to an array of slink:VkDescriptorUpdateTemplateEntry structures describing the descriptors to be updated by the descriptor update template. * pname:templateType Specifies the type of the descriptor update template. If set to ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET it can: only be used to update descriptor sets with a fixed pname:descriptorSetLayout. ifdef::VK_KHR_push_descriptor[] If set to ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR it can: only be used to push descriptor sets using the provided pname:pipelineBindPoint, pname:pipelineLayout, and pname:set number. endif::VK_KHR_push_descriptor[] * pname:descriptorSetLayout is the descriptor set layout the parameter update template will be used with. All descriptor sets which are going to be updated through the newly created descriptor update template must: be created with this layout. pname:descriptorSetLayout is the descriptor set layout used to build the descriptor update template. All descriptor sets which are going to be updated through the newly created descriptor update template must: be created with a layout that matches (is the same as, or defined identically to) this layout. This parameter is ignored if pname:templateType is not ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET. ifdef::VK_KHR_push_descriptor[] * pname:pipelineBindPoint is a elink:VkPipelineBindPoint indicating whether the descriptors will be used by graphics pipelines or compute pipelines. This parameter is ignored if pname:templateType is not ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR * pname:pipelineLayout is a slink:VkPipelineLayout object used to program the bindings. This parameter is ignored if pname:templateType is not ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR * pname:set is the set number of the descriptor set in the pipeline layout that will be updated. This parameter is ignored if pname:templateType is not ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR endif::VK_KHR_push_descriptor[] ifndef::VK_KHR_push_descriptor[] * pname:pipelineBindPoint is reserved for future use and is ignored * pname:pipelineLayout is reserved for future use and is ignored * pname:set is reserved for future use and is ignored endif::VK_KHR_push_descriptor[] .Valid Usage **** * [[VUID-VkDescriptorUpdateTemplateCreateInfo-templateType-00350]] If pname:templateType is ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET, pname:descriptorSetLayout must: be a valid sname:VkDescriptorSetLayout handle ifdef::VK_KHR_push_descriptor[] * [[VUID-VkDescriptorUpdateTemplateCreateInfo-templateType-00351]] If pname:templateType is ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR, pname:pipelineBindPoint must: be a valid elink:VkPipelineBindPoint value * [[VUID-VkDescriptorUpdateTemplateCreateInfo-templateType-00352]] If pname:templateType is ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR, pname:pipelineLayout must: be a valid sname:VkPipelineLayout handle * [[VUID-VkDescriptorUpdateTemplateCreateInfo-templateType-00353]] If pname:templateType is ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR, pname:set must: be the unique set number in the pipeline layout that uses a descriptor set layout that was created with ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR endif::VK_KHR_push_descriptor[] **** include::{generated}/validity/structs/VkDescriptorUpdateTemplateCreateInfo.txt[] -- [open,refpage='VkDescriptorUpdateTemplateCreateFlags',desc='Reserved for future use',type='flags'] -- include::{generated}/api/flags/VkDescriptorUpdateTemplateCreateFlags.txt[] ifdef::VK_KHR_descriptor_update_template[] or the equivalent include::{generated}/api/flags/VkDescriptorUpdateTemplateCreateFlagsKHR.txt[] endif::VK_KHR_descriptor_update_template[] tname:VkDescriptorUpdateTemplateCreateFlags is a bitmask type for setting a mask, but is currently reserved for future use. -- [open,refpage='VkDescriptorUpdateTemplateType',desc='Indicates the valid usage of the descriptor update template',type='enums'] -- The descriptor update template type is determined by the slink:VkDescriptorUpdateTemplateCreateInfo::pname:templateType property, which takes the following values: include::{generated}/api/enums/VkDescriptorUpdateTemplateType.txt[] ifdef::VK_KHR_descriptor_update_template[] or the equivalent include::{generated}/api/enums/VkDescriptorUpdateTemplateTypeKHR.txt[] endif::VK_KHR_descriptor_update_template[] * ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET specifies that the descriptor update template will be used for descriptor set updates only. ifdef::VK_KHR_push_descriptor[] * ename:VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR specifies that the descriptor update template will be used for push descriptor updates only. endif::VK_KHR_push_descriptor[] -- [open,refpage='VkDescriptorUpdateTemplateEntry',desc='Describes a single descriptor update of the descriptor update template',type='structs'] -- The sname:VkDescriptorUpdateTemplateEntry structure is defined as: include::{generated}/api/structs/VkDescriptorUpdateTemplateEntry.txt[] ifdef::VK_KHR_descriptor_update_template[] or the equivalent include::{generated}/api/structs/VkDescriptorUpdateTemplateEntryKHR.txt[] endif::VK_KHR_descriptor_update_template[] * pname:dstBinding is the descriptor binding to update when using this descriptor update template. * pname:dstArrayElement is the starting element in the array belonging to pname:dstBinding. ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:srcBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:dstArrayElement specifies the starting byte offset to update. endif::VK_EXT_inline_uniform_block[] * pname:descriptorCount is the number of descriptors to update. If pname:descriptorCount is greater than the number of remaining array elements in the destination binding, those affect consecutive bindings in a manner similar to slink:VkWriteDescriptorSet above. ifdef::VK_EXT_inline_uniform_block[] If the descriptor binding identified by pname:dstBinding has a descriptor type of ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then pname:descriptorCount specifies the number of bytes to update and the remaining array elements in the destination binding refer to the remaining number of bytes in it. endif::VK_EXT_inline_uniform_block[] * pname:descriptorType is a elink:VkDescriptorType specifying the type of the descriptor. * pname:offset is the offset in bytes of the first binding in the raw data structure. * pname:stride is the stride in bytes between two consecutive array elements of the descriptor update informations in the raw data structure. The actual pointer ptr for each array element j of update entry i is computed using the following formula: + [source,c++] --------------------------------------------------- const char *ptr = (const char *)pData + pDescriptorUpdateEntries[i].offset + j * pDescriptorUpdateEntries[i].stride --------------------------------------------------- + The stride is useful in case the bindings are stored in structs along with other data. ifdef::VK_EXT_inline_uniform_block[] If pname:descriptorType is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT then the value of pname:stride is ignored and the stride is assumed to be `1`, i.e. the descriptor update information for them is always specified as a contiguous range. endif::VK_EXT_inline_uniform_block[] .Valid Usage **** * [[VUID-VkDescriptorUpdateTemplateEntry-dstBinding-00354]] pname:dstBinding must: be a valid binding in the descriptor set layout implicitly specified when using a descriptor update template to update descriptors. * [[VUID-VkDescriptorUpdateTemplateEntry-dstArrayElement-00355]] pname:dstArrayElement and pname:descriptorCount must: be less than or equal to the number of array elements in the descriptor set binding implicitly specified when using a descriptor update template to update descriptors, and all applicable consecutive bindings, as described by <> ifdef::VK_EXT_inline_uniform_block[] * [[VUID-VkDescriptorUpdateTemplateEntry-descriptor-02226]] If pname:descriptor type is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:dstArrayElement must: be an integer multiple of `4` * [[VUID-VkDescriptorUpdateTemplateEntry-descriptor-02227]] If pname:descriptor type is ename:VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK_EXT, pname:descriptorCount must: be an integer multiple of `4` endif::VK_EXT_inline_uniform_block[] **** include::{generated}/validity/structs/VkDescriptorUpdateTemplateEntry.txt[] -- [open,refpage='vkDestroyDescriptorUpdateTemplate',desc='Destroy a descriptor update template object',type='protos'] -- To destroy a descriptor update template, call: ifdef::VK_VERSION_1_1[] include::{generated}/api/protos/vkDestroyDescriptorUpdateTemplate.txt[] endif::VK_VERSION_1_1[] ifdef::VK_VERSION_1_1+VK_KHR_descriptor_update_template[or the equivalent command] ifdef::VK_KHR_descriptor_update_template[] include::{generated}/api/protos/vkDestroyDescriptorUpdateTemplateKHR.txt[] endif::VK_KHR_descriptor_update_template[] * pname:device is the logical device that has been used to create the descriptor update template * pname:descriptorUpdateTemplate is the descriptor update template to destroy. * pname:pAllocator controls host memory allocation as described in the <> chapter. .Valid Usage **** * [[VUID-vkDestroyDescriptorUpdateTemplate-descriptorSetLayout-00356]] If sname:VkAllocationCallbacks were provided when pname:descriptorSetLayout was created, a compatible set of callbacks must: be provided here * [[VUID-vkDestroyDescriptorUpdateTemplate-descriptorSetLayout-00357]] If no sname:VkAllocationCallbacks were provided when pname:descriptorSetLayout was created, pname:pAllocator must: be `NULL` **** include::{generated}/validity/protos/vkDestroyDescriptorUpdateTemplate.txt[] -- [open,refpage='vkUpdateDescriptorSetWithTemplate',desc='Update the contents of a descriptor set object using an update template',type='protos'] -- Once a sname:VkDescriptorUpdateTemplate has been created, descriptor sets can: be updated by calling: ifdef::VK_VERSION_1_1[] include::{generated}/api/protos/vkUpdateDescriptorSetWithTemplate.txt[] endif::VK_VERSION_1_1[] ifdef::VK_VERSION_1_1+VK_KHR_descriptor_update_template[or the equivalent command] ifdef::VK_KHR_descriptor_update_template[] include::{generated}/api/protos/vkUpdateDescriptorSetWithTemplateKHR.txt[] endif::VK_KHR_descriptor_update_template[] * pname:device is the logical device that updates the descriptor sets. * pname:descriptorSet is the descriptor set to update * pname:descriptorUpdateTemplate is the slink:VkDescriptorUpdateTemplate which specifies the update mapping between pname:pData and the descriptor set to update. * pname:pData is a pointer to memory which contains one or more structures of slink:VkDescriptorImageInfo, slink:VkDescriptorBufferInfo, or slink:VkBufferView used to write the descriptors. .Valid Usage **** * [[VUID-vkUpdateDescriptorSetWithTemplate-pData-01685]] pname:pData must: be a valid pointer to a memory that contains one or more valid instances of slink:VkDescriptorImageInfo, slink:VkDescriptorBufferInfo, or slink:VkBufferView in a layout defined by pname:descriptorUpdateTemplate when it was created with flink:vkCreateDescriptorUpdateTemplate **** include::{generated}/validity/protos/vkUpdateDescriptorSetWithTemplate.txt[] .API example [source,c++] --------------------------------------------------- struct AppBufferView { VkBufferView bufferView; uint32_t applicationRelatedInformation; }; struct AppDataStructure { VkDescriptorImageInfo imageInfo; // a single image info VkDescriptorBufferInfo bufferInfoArray[3]; // 3 buffer infos in an array AppBufferView bufferView[2]; // An application defined structure containing a bufferView // ... some more application related data }; const VkDescriptorUpdateTemplateEntry descriptorUpdateTemplateEntries[] = { // binding to a single image descriptor { 0, // binding 0, // dstArrayElement 1, // descriptorCount VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, // descriptorType offsetof(AppDataStructure, imageInfo), // offset 0 // stride is not required if descriptorCount is 1 }, // binding to an array of buffer descriptors { 1, // binding 0, // dstArrayElement 3, // descriptorCount VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, // descriptorType offsetof(AppDataStructure, bufferInfoArray), // offset sizeof(VkDescriptorBufferInfo) // stride, descriptor buffer infos are compact }, // binding to an array of buffer views { 2, // binding 0, // dstArrayElement 2, // descriptorCount VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER, // descriptorType offsetof(AppDataStructure, bufferView) + offsetof(AppBufferView, bufferView), // offset sizeof(AppBufferView) // stride, bufferViews do not have to be compact }, }; // create a descriptor update template for descriptor set updates const VkDescriptorUpdateTemplateCreateInfo createInfo = { VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO, // sType NULL, // pNext 0, // flags 3, // descriptorUpdateEntryCount descriptorUpdateTemplateEntries, // pDescriptorUpdateEntries VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_DESCRIPTOR_SET, // templateType myLayout, // descriptorSetLayout 0, // pipelineBindPoint, ignored by given templateType 0, // pipelineLayout, ignored by given templateType 0, // set, ignored by given templateType }; VkDescriptorUpdateTemplate myDescriptorUpdateTemplate; myResult = vkCreateDescriptorUpdateTemplate( myDevice, &createInfo, NULL, &myDescriptorUpdateTemplate); } AppDataStructure appData; // fill appData here or cache it in your engine vkUpdateDescriptorSetWithTemplate(myDevice, myDescriptorSet, myDescriptorUpdateTemplate, &appData); --------------------------------------------------- -- endif::VK_VERSION_1_1,VK_KHR_descriptor_update_template[] [[descriptorsets-binding]] === Descriptor Set Binding [open,refpage='vkCmdBindDescriptorSets',desc='Binds descriptor sets to a command buffer',type='protos'] -- To bind one or more descriptor sets to a command buffer, call: include::{generated}/api/protos/vkCmdBindDescriptorSets.txt[] * pname:commandBuffer is the command buffer that the descriptor sets will be bound to. * pname:pipelineBindPoint is a elink:VkPipelineBindPoint indicating whether the descriptors will be used by graphics pipelines or compute pipelines. There is a separate set of bind points for each of graphics and compute, so binding one does not disturb the other. * pname:layout is a slink:VkPipelineLayout object used to program the bindings. * pname:firstSet is the set number of the first descriptor set to be bound. * pname:descriptorSetCount is the number of elements in the pname:pDescriptorSets array. * pname:pDescriptorSets is an array of handles to slink:VkDescriptorSet objects describing the descriptor sets to write to. * pname:dynamicOffsetCount is the number of dynamic offsets in the pname:pDynamicOffsets array. * pname:pDynamicOffsets is a pointer to an array of code:uint32_t values specifying dynamic offsets. fname:vkCmdBindDescriptorSets causes the sets numbered [pname:firstSet.. pname:firstSet+pname:descriptorSetCount-1] to use the bindings stored in pname:pDescriptorSets[0..pname:descriptorSetCount-1] for subsequent rendering commands (either compute or graphics, according to the pname:pipelineBindPoint). Any bindings that were previously applied via these sets are no longer valid. Once bound, a descriptor set affects rendering of subsequent graphics or compute commands in the command buffer until a different set is bound to the same set number, or else until the set is disturbed as described in <>. A compatible descriptor set must: be bound for all set numbers that any shaders in a pipeline access, at the time that a draw or dispatch command is recorded to execute using that pipeline. However, if none of the shaders in a pipeline statically use any bindings with a particular set number, then no descriptor set need be bound for that set number, even if the pipeline layout includes a non-trivial descriptor set layout for that set number. [[descriptorsets-binding-dynamicoffsets]] If any of the sets being bound include dynamic uniform or storage buffers, then pname:pDynamicOffsets includes one element for each array element in each dynamic descriptor type binding in each set. Values are taken from pname:pDynamicOffsets in an order such that all entries for set N come before set N+1; within a set, entries are ordered by the binding numbers in the descriptor set layouts; and within a binding array, elements are in order. pname:dynamicOffsetCount must: equal the total number of dynamic descriptors in the sets being bound. The effective offset used for dynamic uniform and storage buffer bindings is the sum of the relative offset taken from pname:pDynamicOffsets, and the base address of the buffer plus base offset in the descriptor set. The range of the dynamic uniform and storage buffer bindings is the buffer range as specified in the descriptor set. Each of the pname:pDescriptorSets must: be compatible with the pipeline layout specified by pname:layout. The layout used to program the bindings must: also be compatible with the pipeline used in subsequent graphics or compute commands, as defined in the <> section. The descriptor set contents bound by a call to fname:vkCmdBindDescriptorSets may: be consumed at the following times: ifdef::VK_EXT_descriptor_indexing[] * For descriptor bindings created with the ename:VK_DESCRIPTOR_BINDING_UPDATE_AFTER_BIND_BIT_EXT bit set, the contents may: be consumed when the command buffer is submitted to a queue, or during shader execution of the resulting draws and dispatches, or any time in between. Otherwise, endif::VK_EXT_descriptor_indexing[] * during host execution of the command, or during shader execution of the resulting draws and dispatches, or any time in between. Thus, the contents of a descriptor set binding must: not be altered (overwritten by an update command, or freed) between the first point in time that it may: be consumed, and when the command completes executing on the queue. The contents of pname:pDynamicOffsets are consumed immediately during execution of fname:vkCmdBindDescriptorSets. Once all pending uses have completed, it is legal to update and reuse a descriptor set. .Valid Usage **** * [[VUID-vkCmdBindDescriptorSets-pDescriptorSets-00358]] Each element of pname:pDescriptorSets must: have been allocated with a sname:VkDescriptorSetLayout that matches (is the same as, or identically defined as) the sname:VkDescriptorSetLayout at set _n_ in pname:layout, where _n_ is the sum of pname:firstSet and the index into pname:pDescriptorSets * [[VUID-vkCmdBindDescriptorSets-dynamicOffsetCount-00359]] pname:dynamicOffsetCount must: be equal to the total number of dynamic descriptors in pname:pDescriptorSets * [[VUID-vkCmdBindDescriptorSets-firstSet-00360]] The sum of pname:firstSet and pname:descriptorSetCount must: be less than or equal to sname:VkPipelineLayoutCreateInfo::pname:setLayoutCount provided when pname:layout was created * [[VUID-vkCmdBindDescriptorSets-pipelineBindPoint-00361]] pname:pipelineBindPoint must: be supported by the pname:commandBuffer's parent sname:VkCommandPool's queue family * [[VUID-vkCmdBindDescriptorSets-pDynamicOffsets-01971]] Each element of pname:pDynamicOffsets which corresponds to a descriptor binding with type ename:VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC must: be a multiple of sname:VkPhysicalDeviceLimits::pname:minUniformBufferOffsetAlignment * [[VUID-vkCmdBindDescriptorSets-pDynamicOffsets-01972]] Each element of pname:pDynamicOffsets which corresponds to a descriptor binding with type ename:VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC must: be a multiple of sname:VkPhysicalDeviceLimits::pname:minStorageBufferOffsetAlignment * [[VUID-vkCmdBindDescriptorSets-pDescriptorSets-01979]] For each dynamic uniform or storage buffer binding in pname:pDescriptorSets, the sum of the effective offset, as defined above, and the range of the binding must: be less than or equal to the size of the buffer **** include::{generated}/validity/protos/vkCmdBindDescriptorSets.txt[] -- ifdef::VK_KHR_push_descriptor[] [[descriptorsets-push-descriptors]] === Push Descriptor Updates [open,refpage='vkCmdPushDescriptorSetKHR',desc='Pushes descriptor updates into a command buffer',type='protos'] -- In addition to allocating descriptor sets and binding them to a command buffer, an application can: record descriptor updates into the command buffer. To push descriptor updates into a command buffer, call: include::{generated}/api/protos/vkCmdPushDescriptorSetKHR.txt[] * pname:commandBuffer is the command buffer that the descriptors will be recorded in. * pname:pipelineBindPoint is a elink:VkPipelineBindPoint indicating whether the descriptors will be used by graphics pipelines or compute pipelines. There is a separate set of push descriptor bindings for each of graphics and compute, so binding one does not disturb the other. * pname:layout is a slink:VkPipelineLayout object used to program the bindings. * pname:set is the set number of the descriptor set in the pipeline layout that will be updated. * pname:descriptorWriteCount is the number of elements in the pname:pDescriptorWrites array. * pname:pDescriptorWrites is a pointer to an array of slink:VkWriteDescriptorSet structures describing the descriptors to be updated. _Push descriptors_ are a small bank of descriptors whose storage is internally managed by the command buffer rather than being written into a descriptor set and later bound to a command buffer. Push descriptors allow for incremental updates of descriptors without managing the lifetime of descriptor sets. When a command buffer begins recording, all push descriptors are undefined:. Push descriptors can: be updated incrementally and cause shaders to use the updated descriptors for subsequent rendering commands (either compute or graphics, according to the pname:pipelineBindPoint) until the descriptor is overwritten, or else until the set is disturbed as described in <>. When the set is disturbed or push descriptors with a different descriptor set layout are set, all push descriptors are undefined:. Push descriptors that are <> by a pipeline must: not be undefined: at the time that a draw or dispatch command is recorded to execute using that pipeline. This includes immutable sampler descriptors, which must: be pushed before they are accessed by a pipeline. Push descriptors that are not statically used can: remain undefined:. Push descriptors do not use dynamic offsets. Instead, the corresponding non-dynamic descriptor types can: be used and the pname:offset member of slink:VkDescriptorBufferInfo can: be changed each time the descriptor is written. Each element of pname:pDescriptorWrites is interpreted as in slink:VkWriteDescriptorSet, except the pname:dstSet member is ignored. To push an immutable sampler, use a slink:VkWriteDescriptorSet with pname:dstBinding and pname:dstArrayElement selecting the immutable sampler's binding. If the descriptor type is ename:VK_DESCRIPTOR_TYPE_SAMPLER, the pname:pImageInfo parameter is ignored and the immutable sampler is taken from the push descriptor set layout in the pipeline layout. If the descriptor type is ename:VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, the pname:sampler member of the pname:pImageInfo parameter is ignored and the immutable sampler is taken from the push descriptor set layout in the pipeline layout. .Valid Usage **** * [[VUID-vkCmdPushDescriptorSetKHR-pipelineBindPoint-00363]] pname:pipelineBindPoint must: be supported by the pname:commandBuffer's parent sname:VkCommandPool's queue family * [[VUID-vkCmdPushDescriptorSetKHR-set-00364]] pname:set must: be less than sname:VkPipelineLayoutCreateInfo::pname:setLayoutCount provided when pname:layout was created * [[VUID-vkCmdPushDescriptorSetKHR-set-00365]] pname:set must: be the unique set number in the pipeline layout that uses a descriptor set layout that was created with ename:VK_DESCRIPTOR_SET_LAYOUT_CREATE_PUSH_DESCRIPTOR_BIT_KHR **** include::{generated}/validity/protos/vkCmdPushDescriptorSetKHR.txt[] -- ifdef::VK_VERSION_1_1,VK_KHR_descriptor_update_template[] === Push Descriptor Updates with Descriptor Update Templates [open,refpage='vkCmdPushDescriptorSetWithTemplateKHR',desc='Pushes descriptor updates into a command buffer using a descriptor update template',type='protos'] -- It is also possible to use a descriptor update template to specify the push descriptors to update. To do so, call: include::{generated}/api/protos/vkCmdPushDescriptorSetWithTemplateKHR.txt[] * pname:commandBuffer is the command buffer that the descriptors will be recorded in. * pname:descriptorUpdateTemplate is a descriptor update template that defines how to interpret the descriptor information in pname:pData. * pname:layout is a slink:VkPipelineLayout object used to program the bindings. It must: be compatible with the layout used to create the pname:descriptorUpdateTemplate handle. * pname:set is the set number of the descriptor set in the pipeline layout that will be updated. This must: be the same number used to create the pname:descriptorUpdateTemplate handle. * pname:pData points to memory which contains the descriptors for the templated update. .Valid Usage **** * [[VUID-vkCmdPushDescriptorSetWithTemplateKHR-commandBuffer-00366]] The pname:pipelineBindPoint specified during the creation of the descriptor update template must: be supported by the pname:commandBuffer's parent sname:VkCommandPool's queue family * [[VUID-vkCmdPushDescriptorSetWithTemplateKHR-pData-01686]] pname:pData must: be a valid pointer to a memory that contains one or more valid instances of slink:VkDescriptorImageInfo, slink:VkDescriptorBufferInfo, or slink:VkBufferView in a layout defined by pname:descriptorUpdateTemplate when it was created with flink:vkCreateDescriptorUpdateTemplateKHR **** include::{generated}/validity/protos/vkCmdPushDescriptorSetWithTemplateKHR.txt[] .API example [source,c++] --------------------------------------------------- struct AppDataStructure { VkDescriptorImageInfo imageInfo; // a single image info // ... some more application related data }; const VkDescriptorUpdateTemplateEntry descriptorUpdateTemplateEntries[] = { // binding to a single image descriptor { 0, // binding 0, // dstArrayElement 1, // descriptorCount VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, // descriptorType offsetof(AppDataStructure, imageInfo), // offset 0 // stride is not required if descriptorCount is 1 } }; // create a descriptor update template for descriptor set updates const VkDescriptorUpdateTemplateCreateInfo createInfo = { VK_STRUCTURE_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_CREATE_INFO, // sType NULL, // pNext 0, // flags 1, // descriptorUpdateEntryCount descriptorUpdateTemplateEntries, // pDescriptorUpdateEntries VK_DESCRIPTOR_UPDATE_TEMPLATE_TYPE_PUSH_DESCRIPTORS_KHR, // templateType 0, // descriptorSetLayout, ignored by given templateType VK_PIPELINE_BIND_POINT_GRAPHICS, // pipelineBindPoint myPipelineLayout, // pipelineLayout 0, // set }; VkDescriptorUpdateTemplate myDescriptorUpdateTemplate; myResult = vkCreateDescriptorUpdateTemplate( myDevice, &createInfo, NULL, &myDescriptorUpdateTemplate); } AppDataStructure appData; // fill appData here or cache it in your engine vkCmdPushDescriptorSetWithTemplateKHR(myCmdBuffer, myDescriptorUpdateTemplate, myPipelineLayout, 0,&appData); --------------------------------------------------- -- endif::VK_VERSION_1_1,VK_KHR_descriptor_update_template[] endif::VK_KHR_push_descriptor[] === Push Constant Updates [[descriptorsets-push-constants]] As described above in section <>, the pipeline layout defines shader push constants which are updated via Vulkan commands rather than via writes to memory or copy commands. [NOTE] .Note ==== Push constants represent a high speed path to modify constant data in pipelines that is expected to outperform memory-backed resource updates. ==== The values of push constants are undefined: at the start of a command buffer. [open,refpage='vkCmdPushConstants',desc='Update the values of push constants',type='protos'] -- To update push constants, call: include::{generated}/api/protos/vkCmdPushConstants.txt[] * pname:commandBuffer is the command buffer in which the push constant update will be recorded. * pname:layout is the pipeline layout used to program the push constant updates. * pname:stageFlags is a bitmask of elink:VkShaderStageFlagBits specifying the shader stages that will use the push constants in the updated range. * pname:offset is the start offset of the push constant range to update, in units of bytes. * pname:size is the size of the push constant range to update, in units of bytes. * pname:pValues is an array of pname:size bytes containing the new push constant values. [NOTE] .Note ==== As pname:stageFlags needs to include all flags the relevant push constant ranges were created with, any flags that are not supported by the queue family that the slink:VkCommandPool used to allocate pname:commandBuffer was created on are ignored. ==== .Valid Usage **** * [[VUID-vkCmdPushConstants-offset-01795]] For each byte in the range specified by pname:offset and pname:size and for each shader stage in pname:stageFlags, there must: be a push constant range in pname:layout that includes that byte and that stage * [[VUID-vkCmdPushConstants-offset-01796]] For each byte in the range specified by pname:offset and pname:size and for each push constant range that overlaps that byte, pname:stageFlags must: include all stages in that push constant range's slink:VkPushConstantRange::pname:stageFlags * [[VUID-vkCmdPushConstants-offset-00368]] pname:offset must: be a multiple of `4` * [[VUID-vkCmdPushConstants-size-00369]] pname:size must: be a multiple of `4` * [[VUID-vkCmdPushConstants-offset-00370]] pname:offset must: be less than sname:VkPhysicalDeviceLimits::pname:maxPushConstantsSize * [[VUID-vkCmdPushConstants-size-00371]] pname:size must: be less than or equal to sname:VkPhysicalDeviceLimits::pname:maxPushConstantsSize minus pname:offset **** include::{generated}/validity/protos/vkCmdPushConstants.txt[] -- ifdef::VK_EXT_buffer_device_address[] == Physical Storage Buffer Access [[descriptorsets-physical-storage-buffer]] [open,refpage='vkGetBufferDeviceAddressEXT',desc='Query an address of a buffer',type='protos'] -- To query a 64-bit buffer device address value through which buffer memory can: be accessed in a shader, call: include::{generated}/api/protos/vkGetBufferDeviceAddressEXT.txt[] * pname:device is the logical device that the buffer was created on. * pname:pInfo is a pointer to an instance of the slink:VkBufferDeviceAddressInfoEXT structure specifying the buffer to retrieve an address for. The 64-bit return value is an address of the start of pname:pInfo::pname:buffer. The address range starting at this value and whose size is the size of the buffer can: be used in a shader to access the memory bound to that buffer, using the `SPV_EXT_physical_storage_buffer` extension and the code:PhysicalStorageBufferEXT storage class. For example, this value can: be stored in a uniform buffer, and the shader can: read the value from the uniform buffer and use it to do a dependent read/write to this buffer. A value of zero is reserved as a "`null`" pointer and must: not be returned as a valid buffer device address. All loads, stores, and atomics in a shader through code:PhysicalStorageBufferEXT pointers must: access addresses in the address range of some buffer. If the buffer was created with a non-zero value of slink:VkBufferDeviceAddressCreateInfoEXT::pname:deviceAddress, the return value will be the same address. .Valid Usage **** * [[VUID-vkGetBufferDeviceAddressEXT-None-02598]] The <> feature must: be enabled * [[VUID-vkGetBufferDeviceAddressEXT-device-02599]] If pname:device was created with multiple physical devices, then the <> feature must: be enabled **** include::{generated}/validity/protos/vkGetBufferDeviceAddressEXT.txt[] -- [open,refpage='VkBufferDeviceAddressInfoEXT',desc='Structure specifying the buffer to query an address for',type='structs'] -- The sname:VkBufferDeviceAddressInfoEXT structure is defined as: include::{generated}/api/structs/VkBufferDeviceAddressInfoEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:buffer specifies the buffer whose address is being queried. .Valid Usage **** * [[VUID-VkBufferDeviceAddressInfoEXT-buffer-02600]] If pname:buffer is non-sparse and was not created with the ename:VK_BUFFER_CREATE_DEVICE_ADDRESS_CAPTURE_REPLAY_BIT_EXT flag, then it must: be bound completely and contiguously to a single sname:VkDeviceMemory object * [[VUID-VkBufferDeviceAddressInfoEXT-buffer-02601]] pname:buffer must: have been created with ename:VK_BUFFER_USAGE_SHADER_DEVICE_ADDRESS_BIT_EXT **** include::{generated}/validity/structs/VkBufferDeviceAddressInfoEXT.txt[] -- endif::VK_EXT_buffer_device_address[]