Safe Haskell | Safe-Inferred |
---|---|
Language | Haskell2010 |
Name
VK_KHR_maintenance2 - device extension
VK_KHR_maintenance2
- Name String
VK_KHR_maintenance2
- Extension Type
- Device extension
- Registered Extension Number
- 118
- Revision
- 1
- Ratification Status
- Ratified
- Extension and Version Dependencies; Deprecation State
- Promoted to Vulkan 1.1
- Contact
Other Extension Metadata
- Last Modified Date
- 2017-09-05
- Interactions and External Dependencies
- Promoted to Vulkan 1.1 Core
- Contributors
- Michael Worcester, Imagination Technologies
- Stuart Smith, Imagination Technologies
- Jeff Bolz, NVIDIA
- Daniel Koch, NVIDIA
- Jan-Harald Fredriksen, ARM
- Daniel Rakos, AMD
- Neil Henning, Codeplay
- Piers Daniell, NVIDIA
Description
VK_KHR_maintenance2
adds a collection of minor features that were
intentionally left out or overlooked from the original Vulkan 1.0
release.
The new features are as follows:
- Allow the application to specify which aspect of an input attachment might be read for a given subpass.
- Allow implementations to express the clipping behavior of points.
- Allow creating images with usage flags that may not be supported for the base image’s format, but are supported for image views of the image that have a different but compatible format.
- Allow creating uncompressed image views of compressed images.
- Allow the application to select between an upper-left and lower-left origin for the tessellation domain space.
- Adds two new image layouts for depth stencil images to allow either the depth or stencil aspect to be read-only while the other aspect is writable.
Input Attachment Specification
Input attachment specification allows an application to specify which
aspect of a multi-aspect image (e.g. a depth/stencil format) will be
accessed via a subpassLoad
operation.
On some implementations there may be a performance penalty if the
implementation does not know (at createRenderPass
time) which aspect(s) of multi-aspect images can be accessed as input
attachments.
Promotion to Vulkan 1.1
All functionality in this extension is included in core Vulkan 1.1, with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.
New Structures
Extending
ImageViewCreateInfo
:Extending
PhysicalDeviceProperties2
:Extending
PipelineTessellationStateCreateInfo
:Extending
RenderPassCreateInfo
:
New Enums
New Enum Constants
KHR_MAINTENANCE2_SPEC_VERSION
KHR_MAINTENANCE_2_EXTENSION_NAME
KHR_MAINTENANCE_2_SPEC_VERSION
Extending
ImageCreateFlagBits
:Extending
ImageLayout
:Extending
PointClippingBehavior
:Extending
StructureType
:Extending
TessellationDomainOrigin
:
Input Attachment Specification Example
Consider the case where a render pass has two subpasses and two attachments.
Attachment 0 has the format
FORMAT_D24_UNORM_S8_UINT
, attachment 1 has
some color format.
Subpass 0 writes to attachment 0, subpass 1 reads only the depth information from attachment 0 (using inputAttachmentRead) and writes to attachment 1.
VkInputAttachmentAspectReferenceKHR references[] = { { .subpass = 1, .inputAttachmentIndex = 0, .aspectMask = VK_IMAGE_ASPECT_DEPTH_BIT } }; VkRenderPassInputAttachmentAspectCreateInfoKHR specifyAspects = { .sType = VK_STRUCTURE_TYPE_RENDER_PASS_INPUT_ATTACHMENT_ASPECT_CREATE_INFO_KHR, .pNext = NULL, .aspectReferenceCount = 1, .pAspectReferences = references }; VkRenderPassCreateInfo createInfo = { ... .pNext = &specifyAspects, ... }; vkCreateRenderPass(...);
Issues
1) What is the default tessellation domain origin?
RESOLVED: Vulkan 1.0 originally inadvertently documented a lower-left origin, but the conformance tests and all implementations implemented an upper-left origin. This extension adds a control to select between lower-left (for compatibility with OpenGL) and upper-left, and we retroactively fix unextended Vulkan to have a default of an upper-left origin.
Version History
- Revision 1, 2017-04-28
See Also
ImageViewUsageCreateInfoKHR
, InputAttachmentAspectReferenceKHR
,
PhysicalDevicePointClippingPropertiesKHR
,
PipelineTessellationDomainOriginStateCreateInfoKHR
,
PointClippingBehaviorKHR
,
RenderPassInputAttachmentAspectCreateInfoKHR
,
TessellationDomainOriginKHR
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.
Documentation
pattern KHR_MAINTENANCE2_SPEC_VERSION :: Integral a => a Source #
pattern KHR_MAINTENANCE2_EXTENSION_NAME :: (Eq a, IsString a) => a Source #
pattern STRUCTURE_TYPE_RENDER_PASS_INPUT_ATTACHMENT_ASPECT_CREATE_INFO_KHR :: StructureType Source #
pattern STRUCTURE_TYPE_PIPELINE_TESSELLATION_DOMAIN_ORIGIN_STATE_CREATE_INFO_KHR :: StructureType Source #
type RenderPassInputAttachmentAspectCreateInfoKHR = RenderPassInputAttachmentAspectCreateInfo Source #
type PipelineTessellationDomainOriginStateCreateInfoKHR = PipelineTessellationDomainOriginStateCreateInfo Source #
type KHR_MAINTENANCE_2_SPEC_VERSION = 1 Source #
pattern KHR_MAINTENANCE_2_SPEC_VERSION :: forall a. Integral a => a Source #
type KHR_MAINTENANCE_2_EXTENSION_NAME = "VK_KHR_maintenance2" Source #
pattern KHR_MAINTENANCE_2_EXTENSION_NAME :: forall a. (Eq a, IsString a) => a Source #