Name

VK_ARM_rasterization_order_attachment_access - device extension

VK_ARM_rasterization_order_attachment_access

Name String

VK_ARM_rasterization_order_attachment_access

Extension Type

Device extension

Registered Extension Number

343

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

VK_KHR_get_physical_device_properties2

Deprecation State

• Promoted to VK_EXT_rasterization_order_attachment_access extension

Contact

• Jan-Harald Fredriksen @janharaldfredriksen-arm%0A*Here describe the issue or question you have about the VK_ARM_rasterization_order_attachment_access extension*

Other Extension Metadata

Last Modified Date

2021-11-12

IP Status

No known IP claims.

Contributors

• Tobias Hector, AMD
• Jan-Harald Fredriksen, Arm

Description

Render passes, and specifically subpass dependencies, enable much of the same functionality as the framebuffer fetch and pixel local storage extensions did for OpenGL ES. But certain techniques such as programmable blending are awkward or impractical to implement with these alone, in part because a self-dependency is required every time a fragment will read a value at a given sample coordinate.

This extension extends the mechanism of input attachments to allow access to framebuffer attachments when used as both input and color, or depth/stencil, attachments from one fragment to the next, in rasterization order, without explicit synchronization.

New Structures

• Extending PhysicalDeviceFeatures2, DeviceCreateInfo:

  • PhysicalDeviceRasterizationOrderAttachmentAccessFeaturesARM

New Enum Constants

• ARM_RASTERIZATION_ORDER_ATTACHMENT_ACCESS_EXTENSION_NAME

• ARM_RASTERIZATION_ORDER_ATTACHMENT_ACCESS_SPEC_VERSION

• Extending PipelineColorBlendStateCreateFlagBits:

  • PIPELINE_COLOR_BLEND_STATE_CREATE_RASTERIZATION_ORDER_ATTACHMENT_ACCESS_BIT_ARM

• Extending PipelineDepthStencilStateCreateFlagBits:

  • PIPELINE_DEPTH_STENCIL_STATE_CREATE_RASTERIZATION_ORDER_ATTACHMENT_DEPTH_ACCESS_BIT_ARM
  • PIPELINE_DEPTH_STENCIL_STATE_CREATE_RASTERIZATION_ORDER_ATTACHMENT_STENCIL_ACCESS_BIT_ARM

• Extending StructureType:

  • STRUCTURE_TYPE_PHYSICAL_DEVICE_RASTERIZATION_ORDER_ATTACHMENT_ACCESS_FEATURES_ARM

• Extending SubpassDescriptionFlagBits:

  • SUBPASS_DESCRIPTION_RASTERIZATION_ORDER_ATTACHMENT_COLOR_ACCESS_BIT_ARM
  • SUBPASS_DESCRIPTION_RASTERIZATION_ORDER_ATTACHMENT_DEPTH_ACCESS_BIT_ARM
  • SUBPASS_DESCRIPTION_RASTERIZATION_ORDER_ATTACHMENT_STENCIL_ACCESS_BIT_ARM

Issues

1) Is there any interaction with the VK_KHR_dynamic_rendering extension?

No. This extension only affects reads from input attachments. Render pass instances begun with cmdBeginRenderingKHR do not have input attachments and a different mechanism will be needed to provide similar functionality in this case.

Examples

None.

Version History

• Revision 1, 2021-11-12 (Jan-Harald Fredriksen)

  • Initial draft

See Also

PhysicalDeviceRasterizationOrderAttachmentAccessFeaturesARM

Document Notes

For more information, see the Vulkan Specification

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