## C Specification

Bits which can be set in

specify how a pipeline is created, and are:

// Provided by VK_VERSION_1_0
typedef enum VkPipelineCreateFlagBits {
VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT = 0x00000001,
VK_PIPELINE_CREATE_ALLOW_DERIVATIVES_BIT = 0x00000002,
VK_PIPELINE_CREATE_DERIVATIVE_BIT = 0x00000004,
// Provided by VK_VERSION_1_1
VK_PIPELINE_CREATE_VIEW_INDEX_FROM_DEVICE_INDEX_BIT = 0x00000008,
// Provided by VK_VERSION_1_1
VK_PIPELINE_CREATE_DISPATCH_BASE_BIT = 0x00000010,
// Provided by VK_VERSION_1_3
VK_PIPELINE_CREATE_FAIL_ON_PIPELINE_COMPILE_REQUIRED_BIT = 0x00000100,
// Provided by VK_VERSION_1_3
VK_PIPELINE_CREATE_EARLY_RETURN_ON_FAILURE_BIT = 0x00000200,
// Provided by VK_KHR_dynamic_rendering with VK_KHR_fragment_shading_rate
VK_PIPELINE_CREATE_RENDERING_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR = 0x00200000,
// Provided by VK_KHR_dynamic_rendering with VK_EXT_fragment_density_map
VK_PIPELINE_CREATE_RENDERING_FRAGMENT_DENSITY_MAP_ATTACHMENT_BIT_EXT = 0x00400000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_ANY_HIT_SHADERS_BIT_KHR = 0x00004000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_CLOSEST_HIT_SHADERS_BIT_KHR = 0x00008000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_MISS_SHADERS_BIT_KHR = 0x00010000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_INTERSECTION_SHADERS_BIT_KHR = 0x00020000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_SKIP_TRIANGLES_BIT_KHR = 0x00001000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_SKIP_AABBS_BIT_KHR = 0x00002000,
// Provided by VK_KHR_ray_tracing_pipeline
VK_PIPELINE_CREATE_RAY_TRACING_SHADER_GROUP_HANDLE_CAPTURE_REPLAY_BIT_KHR = 0x00080000,
// Provided by VK_NV_ray_tracing
VK_PIPELINE_CREATE_DEFER_COMPILE_BIT_NV = 0x00000020,
// Provided by VK_KHR_pipeline_executable_properties
VK_PIPELINE_CREATE_CAPTURE_STATISTICS_BIT_KHR = 0x00000040,
// Provided by VK_KHR_pipeline_executable_properties
VK_PIPELINE_CREATE_CAPTURE_INTERNAL_REPRESENTATIONS_BIT_KHR = 0x00000080,
// Provided by VK_NV_device_generated_commands
VK_PIPELINE_CREATE_INDIRECT_BINDABLE_BIT_NV = 0x00040000,
// Provided by VK_KHR_pipeline_library
VK_PIPELINE_CREATE_LIBRARY_BIT_KHR = 0x00000800,
// Provided by VK_EXT_graphics_pipeline_library
VK_PIPELINE_CREATE_RETAIN_LINK_TIME_OPTIMIZATION_INFO_BIT_EXT = 0x00800000,
// Provided by VK_EXT_graphics_pipeline_library
VK_PIPELINE_CREATE_LINK_TIME_OPTIMIZATION_BIT_EXT = 0x00000400,
// Provided by VK_NV_ray_tracing_motion_blur
VK_PIPELINE_CREATE_RAY_TRACING_ALLOW_MOTION_BIT_NV = 0x00100000,
// Provided by VK_EXT_attachment_feedback_loop_layout
VK_PIPELINE_CREATE_COLOR_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT = 0x02000000,
// Provided by VK_EXT_attachment_feedback_loop_layout
VK_PIPELINE_CREATE_DEPTH_STENCIL_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT = 0x04000000,
// Provided by VK_EXT_opacity_micromap
VK_PIPELINE_CREATE_RAY_TRACING_OPACITY_MICROMAP_BIT_EXT = 0x01000000,
// Provided by VK_EXT_pipeline_protected_access
VK_PIPELINE_CREATE_NO_PROTECTED_ACCESS_BIT_EXT = 0x08000000,
// Provided by VK_EXT_pipeline_protected_access
VK_PIPELINE_CREATE_PROTECTED_ACCESS_ONLY_BIT_EXT = 0x40000000,
// Provided by VK_VERSION_1_1
VK_PIPELINE_CREATE_DISPATCH_BASE = VK_PIPELINE_CREATE_DISPATCH_BASE_BIT,
// Provided by VK_KHR_dynamic_rendering with VK_KHR_fragment_shading_rate
VK_PIPELINE_RASTERIZATION_STATE_CREATE_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR = VK_PIPELINE_CREATE_RENDERING_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR,
// Provided by VK_KHR_dynamic_rendering with VK_EXT_fragment_density_map
VK_PIPELINE_RASTERIZATION_STATE_CREATE_FRAGMENT_DENSITY_MAP_ATTACHMENT_BIT_EXT = VK_PIPELINE_CREATE_RENDERING_FRAGMENT_DENSITY_MAP_ATTACHMENT_BIT_EXT,
// Provided by VK_KHR_device_group
VK_PIPELINE_CREATE_VIEW_INDEX_FROM_DEVICE_INDEX_BIT_KHR = VK_PIPELINE_CREATE_VIEW_INDEX_FROM_DEVICE_INDEX_BIT,
// Provided by VK_KHR_device_group
VK_PIPELINE_CREATE_DISPATCH_BASE_KHR = VK_PIPELINE_CREATE_DISPATCH_BASE,
// Provided by VK_EXT_pipeline_creation_cache_control
VK_PIPELINE_CREATE_FAIL_ON_PIPELINE_COMPILE_REQUIRED_BIT_EXT = VK_PIPELINE_CREATE_FAIL_ON_PIPELINE_COMPILE_REQUIRED_BIT,
// Provided by VK_EXT_pipeline_creation_cache_control
VK_PIPELINE_CREATE_EARLY_RETURN_ON_FAILURE_BIT_EXT = VK_PIPELINE_CREATE_EARLY_RETURN_ON_FAILURE_BIT,
} VkPipelineCreateFlagBits;

## Description

• VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT specifies that the created pipeline will not be optimized. Using this flag may reduce the time taken to create the pipeline.

• VK_PIPELINE_CREATE_ALLOW_DERIVATIVES_BIT specifies that the pipeline to be created is allowed to be the parent of a pipeline that will be created in a subsequent pipeline creation call.

• VK_PIPELINE_CREATE_DERIVATIVE_BIT specifies that the pipeline to be created will be a child of a previously created parent pipeline.

• VK_PIPELINE_CREATE_VIEW_INDEX_FROM_DEVICE_INDEX_BIT specifies that any shader input variables decorated as ViewIndex will be assigned values as if they were decorated as DeviceIndex.

• VK_PIPELINE_CREATE_DISPATCH_BASE specifies that a compute pipeline can be used with vkCmdDispatchBase with a non-zero base workgroup.

• VK_PIPELINE_CREATE_DEFER_COMPILE_BIT_NV specifies that a pipeline is created with all shaders in the deferred state. Before using the pipeline the application must call vkCompileDeferredNV exactly once on each shader in the pipeline before using the pipeline.

• VK_PIPELINE_CREATE_CAPTURE_STATISTICS_BIT_KHR specifies that the shader compiler should capture statistics for the pipeline executables produced by the compile process which can later be retrieved by calling vkGetPipelineExecutableStatisticsKHR. Enabling this flag must not affect the final compiled pipeline but may disable pipeline caching or otherwise affect pipeline creation time.

• VK_PIPELINE_CREATE_CAPTURE_INTERNAL_REPRESENTATIONS_BIT_KHR specifies that the shader compiler should capture the internal representations of pipeline executables produced by the compile process which can later be retrieved by calling vkGetPipelineExecutableInternalRepresentationsKHR. Enabling this flag must not affect the final compiled pipeline but may disable pipeline caching or otherwise affect pipeline creation time. When capturing IR from pipelines created with pipeline libraries, there is no guarantee that IR from libraries can be retrieved from the linked pipeline. Applications should retrieve IR from each library, and any linked pipelines, separately.

• VK_PIPELINE_CREATE_LIBRARY_BIT_KHR specifies that the pipeline cannot be used directly, and instead defines a pipeline library that can be combined with other pipelines using the VkPipelineLibraryCreateInfoKHR structure. This is available in ray tracing and graphics pipelines.

• VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_ANY_HIT_SHADERS_BIT_KHR specifies that an any-hit shader will always be present when an any-hit shader would be executed. A NULL any-hit shader is an any-hit shader which is effectively VK_SHADER_UNUSED_KHR, such as from a shader group consisting entirely of zeros.

• VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_CLOSEST_HIT_SHADERS_BIT_KHR specifies that a closest hit shader will always be present when a closest hit shader would be executed. A NULL closest hit shader is a closest hit shader which is effectively VK_SHADER_UNUSED_KHR, such as from a shader group consisting entirely of zeros.

• VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_MISS_SHADERS_BIT_KHR specifies that a miss shader will always be present when a miss shader would be executed. A NULL miss shader is a miss shader which is effectively VK_SHADER_UNUSED_KHR, such as from a shader group consisting entirely of zeros.

• VK_PIPELINE_CREATE_RAY_TRACING_NO_NULL_INTERSECTION_SHADERS_BIT_KHR specifies that an intersection shader will always be present when an intersection shader would be executed. A NULL intersection shader is an intersection shader which is effectively VK_SHADER_UNUSED_KHR, such as from a shader group consisting entirely of zeros.

• VK_PIPELINE_CREATE_RAY_TRACING_SKIP_TRIANGLES_BIT_KHR specifies that triangle primitives will be skipped during traversal using OpTraceRayKHR.

• VK_PIPELINE_CREATE_RAY_TRACING_SKIP_AABBS_BIT_KHR specifies that AABB primitives will be skipped during traversal using OpTraceRayKHR.

• VK_PIPELINE_CREATE_RAY_TRACING_SHADER_GROUP_HANDLE_CAPTURE_REPLAY_BIT_KHR specifies that the shader group handles can be saved and reused on a subsequent run (e.g. for trace capture and replay).

• VK_PIPELINE_CREATE_INDIRECT_BINDABLE_BIT_NV specifies that the pipeline can be used in combination with https://registry.khronos.org/vulkan/specs/1.3-extensions/html/vkspec.html#device-generated-commands.

• VK_PIPELINE_CREATE_FAIL_ON_PIPELINE_COMPILE_REQUIRED_BIT specifies that pipeline creation will fail if a compile is required for creation of a valid VkPipeline object; VK_PIPELINE_COMPILE_REQUIRED will be returned by pipeline creation, and the VkPipeline will be set to VK_NULL_HANDLE.

• When creating multiple pipelines, VK_PIPELINE_CREATE_EARLY_RETURN_ON_FAILURE_BIT specifies that control will be returned to the application on failure of the corresponding pipeline rather than continuing to create additional pipelines.

• VK_PIPELINE_CREATE_RAY_TRACING_ALLOW_MOTION_BIT_NV specifies that the pipeline is allowed to use OpTraceRayMotionNV.

• VK_PIPELINE_CREATE_RENDERING_FRAGMENT_SHADING_RATE_ATTACHMENT_BIT_KHR specifies that the pipeline will be used with a fragment shading rate attachment.

• VK_PIPELINE_CREATE_RENDERING_FRAGMENT_DENSITY_MAP_ATTACHMENT_BIT_EXT specifies that the pipeline will be used with a fragment density map attachment.

• VK_PIPELINE_CREATE_LINK_TIME_OPTIMIZATION_BIT_EXT specifies that pipeline libraries being linked into this library should have link time optimizations applied. If this bit is omitted, implementations should instead perform linking as rapidly as possible.

• VK_PIPELINE_CREATE_RETAIN_LINK_TIME_OPTIMIZATION_INFO_BIT_EXT specifies that pipeline libraries should retain any information necessary to later perform an optimal link with VK_PIPELINE_CREATE_LINK_TIME_OPTIMIZATION_BIT_EXT.

• VK_PIPELINE_CREATE_COLOR_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT specifies that the pipeline may be used with an attachment feedback loop including color attachments.

• VK_PIPELINE_CREATE_DEPTH_STENCIL_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT specifies that the pipeline may be used with an attachment feedback loop including depth-stencil attachments.

• VK_PIPELINE_CREATE_RAY_TRACING_OPACITY_MICROMAP_BIT_EXT specifies that the pipeline can be used with acceleration structures which reference an opacity micromap array.

• VK_PIPELINE_CREATE_NO_PROTECTED_ACCESS_BIT_EXT specifies that the pipeline must not be bound to a protected command buffer.

• VK_PIPELINE_CREATE_PROTECTED_ACCESS_ONLY_BIT_EXT specifies that the pipeline must not be bound to an unprotected command buffer.

It is valid to set both VK_PIPELINE_CREATE_ALLOW_DERIVATIVES_BIT and VK_PIPELINE_CREATE_DERIVATIVE_BIT. This allows a pipeline to be both a parent and possibly a child in a pipeline hierarchy. See Pipeline Derivatives for more information.

When an implementation is looking up a pipeline in a pipeline cache, if that pipeline is being created using linked libraries, implementations should always return an equivalent pipeline created with VK_PIPELINE_CREATE_LINK_TIME_OPTIMIZATION_BIT_EXT if available, whether or not that bit was specified.

 Note Using VK_PIPELINE_CREATE_LINK_TIME_OPTIMIZATION_BIT_EXT (or not) when linking pipeline libraries is intended as a performance tradeoff between host and device. If the bit is omitted, linking should be faster and produce a pipeline more rapidly, but performance of the pipeline on the target device may be reduced. If the bit is included, linking may be slower but should produce a pipeline with device performance comparable to a monolithically created pipeline. Using both options can allow latency-sensitive applications to generate a suboptimal but usable pipeline quickly, and then perform an optimal link in the background, substituting the result for the suboptimally linked pipeline as soon as it is available.

## Document Notes

For more information, see the Vulkan Specification

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

Copyright 2014-2022 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0