C Specification
Possible values of the flags
member of
VkPipelineCreationFeedbackEXT are:
typedef enum VkPipelineCreationFeedbackFlagBitsEXT {
VK_PIPELINE_CREATION_FEEDBACK_VALID_BIT_EXT = 0x00000001,
VK_PIPELINE_CREATION_FEEDBACK_APPLICATION_PIPELINE_CACHE_HIT_BIT_EXT = 0x00000002,
VK_PIPELINE_CREATION_FEEDBACK_BASE_PIPELINE_ACCELERATION_BIT_EXT = 0x00000004,
VK_PIPELINE_CREATION_FEEDBACK_FLAG_BITS_MAX_ENUM_EXT = 0x7FFFFFFF
} VkPipelineCreationFeedbackFlagBitsEXT;
Description
-
VK_PIPELINE_CREATION_FEEDBACK_VALID_BIT_EXT
indicates that the feedback information is valid. -
VK_PIPELINE_CREATION_FEEDBACK_APPLICATION_PIPELINE_CACHE_HIT_BIT_EXT
indicates that a readily usable pipeline or pipeline stage was found in thepipelineCache
specified by the application in the pipeline creation command.An implementation should set the
VK_PIPELINE_CREATION_FEEDBACK_APPLICATION_PIPELINE_CACHE_HIT_BIT_EXT
bit if it was able to avoid the large majority of pipeline or pipeline stage creation work by using thepipelineCache
parameter of vkCreateGraphicsPipelines, vkCreateRayTracingPipelinesNV, or vkCreateComputePipelines. When an implementation sets this bit for the entire pipeline, it may leave it unset for any stage.NoteImplementations are encouraged to provide a meaningful signal to applications using this bit. The intention is to communicate to the application that the pipeline or pipeline stage was created "as fast as it gets" using the pipeline cache provided by the application. If an implementation uses an internal cache, it is discouraged from setting this bit as the feedback would be unactionable.
-
VK_PIPELINE_CREATION_FEEDBACK_BASE_PIPELINE_ACCELERATION_BIT_EXT
indicates that the base pipeline specified by thebasePipelineHandle
orbasePipelineIndex
member of theVk*PipelineCreateInfo
structure was used to accelerate the creation of the pipeline.An implementation should set the
VK_PIPELINE_CREATION_FEEDBACK_BASE_PIPELINE_ACCELERATION_BIT_EXT
bit if it was able to avoid a significant amount of work by using the base pipeline.NoteWhile "significant amount of work" is subjective, implementations are encouraged to provide a meaningful signal to applications using this bit. For example, a 1% reduction in duration may not warrant setting this bit, while a 50% reduction would.
See Also
Document Notes
For more information, see the Vulkan Specification
This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.
Copyright
Copyright (c) 2014-2019 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.