Deprecation state
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Promoted to Vulkan 1.3
Contact
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Lionel Landwerlin llandwerlin
Other Extension Metadata
- Last Modified Date
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2021-07-01
- Interactions and External Dependencies
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Promoted to Vulkan 1.3 Core
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- IP Status
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No known IP claims.
- Contributors
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Lionel Landwerlin, Intel
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Faith Ekstrand, Intel
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Tobias Hector, AMD
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Spencer Fricke, Samsung Electronics
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Graeme Leese, Broadcom
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Jan-Harald Fredriksen, ARM
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Description
This extension adds a new VkFormatFeatureFlagBits2KHR 64bits format feature flag type to extend the existing VkFormatFeatureFlagBits which is limited to 31 flags. At the time of this writing 29 bits of VkFormatFeatureFlagBits are already used.
Because VkFormatProperties2 is already defined to extend the Vulkan 1.0 vkGetPhysicalDeviceFormatProperties entry point, this extension defines a new VkFormatProperties3KHR to extend the VkFormatProperties.
On top of replicating all the bits from VkFormatFeatureFlagBits, VkFormatFeatureFlagBits2KHR adds the following bits :
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VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT_KHRandVK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT_KHRindicate that an implementation supports respectively reading and writing a given VkFormat through storage operations without specifying the format in the shader. -
VK_FORMAT_FEATURE_2_SAMPLED_IMAGE_DEPTH_COMPARISON_BIT_KHRindicates that an implementation supports depth comparison performed byOpImage*Dref*instructions on a given VkFormat. Previously the result of executing aOpImage*Dref*instruction on an image view, where theformatwas not one of the depth/stencil formats with a depth component, was undefined. This bit clarifies on which formats such instructions can be used.
Prior to version 2 of this extension, implementations exposing the
shaderStorageImageReadWithoutFormat and
shaderStorageImageWriteWithoutFormat features may not report
VK_FORMAT_FEATURE_2_STORAGE_READ_WITHOUT_FORMAT_BIT_KHR and
VK_FORMAT_FEATURE_2_STORAGE_WRITE_WITHOUT_FORMAT_BIT_KHR in
VkFormatProperties3KHR::bufferFeatures.
Despite this, buffer reads/writes are supported as intended by the original
features.
New Structures
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Extending VkFormatProperties2:
New Enum Constants
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VK_KHR_FORMAT_FEATURE_FLAGS_2_EXTENSION_NAME -
VK_KHR_FORMAT_FEATURE_FLAGS_2_SPEC_VERSION -
Extending VkStructureType:
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VK_STRUCTURE_TYPE_FORMAT_PROPERTIES_3_KHR
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Promotion to Vulkan 1.3
Functionality in this extension is included in core Vulkan 1.3, with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.
Version History
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Revision 2, 2022-07-20 (Lionel Landwerlin)
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Clarify that VK_FORMAT_FEATURE_2_STORAGE_(READ|WRITE)_WITHOUT_FORMAT_BIT also apply to buffer views.
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Revision 1, 2020-07-21 (Lionel Landwerlin)
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Initial draft
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Document Notes
For more information, see the Vulkan Specification
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.