Name

VK_EXT_line_rasterization - device extension

VK_EXT_line_rasterization

Name String

VK_EXT_line_rasterization

Extension Type

Device extension

Registered Extension Number

260

Revision

1

Ratification Status

Not ratified

Extension and Version Dependencies

VK_KHR_get_physical_device_properties2 or Vulkan Version 1.1

Deprecation State

• Promoted to VK_KHR_line_rasterization extension

  • Which in turn was promoted to Vulkan 1.4

Special Use

• CAD support

Contact

• Jeff Bolz @jeffbolznv%0A*Here describe the issue or question you have about the VK_EXT_line_rasterization extension*

Other Extension Metadata

Last Modified Date

2019-05-09

IP Status

No known IP claims.

Contributors

• Jeff Bolz, NVIDIA
• Allen Jensen, NVIDIA
• Faith Ekstrand, Intel

Description

This extension adds some line rasterization features that are commonly used in CAD applications and supported in other APIs like OpenGL. Bresenham-style line rasterization is supported, smooth rectangular lines (coverage to alpha) are supported, and stippled lines are supported for all three line rasterization modes.

Promotion to VK_KHR_line_rasterization

All functionality in this extension is included in VK_KHR_line_rasterization, with the suffix changed to KHR. The original enum names are still available as aliases of the KHR functionality.

New Commands

• cmdSetLineStippleEXT

New Structures

• Extending PhysicalDeviceFeatures2, DeviceCreateInfo:

  • PhysicalDeviceLineRasterizationFeaturesEXT

• Extending PhysicalDeviceProperties2:

  • PhysicalDeviceLineRasterizationPropertiesEXT

• Extending PipelineRasterizationStateCreateInfo:

  • PipelineRasterizationLineStateCreateInfoEXT

New Enums

• LineRasterizationModeEXT

New Enum Constants

• EXT_LINE_RASTERIZATION_EXTENSION_NAME

• EXT_LINE_RASTERIZATION_SPEC_VERSION

• Extending DynamicState:

  • DYNAMIC_STATE_LINE_STIPPLE_EXT

• Extending LineRasterizationMode:

  • LINE_RASTERIZATION_MODE_BRESENHAM_EXT
  • LINE_RASTERIZATION_MODE_DEFAULT_EXT
  • LINE_RASTERIZATION_MODE_RECTANGULAR_EXT
  • LINE_RASTERIZATION_MODE_RECTANGULAR_SMOOTH_EXT

• Extending StructureType:

  • STRUCTURE_TYPE_PHYSICAL_DEVICE_LINE_RASTERIZATION_FEATURES_EXT
  • STRUCTURE_TYPE_PHYSICAL_DEVICE_LINE_RASTERIZATION_PROPERTIES_EXT
  • STRUCTURE_TYPE_PIPELINE_RASTERIZATION_LINE_STATE_CREATE_INFO_EXT

Issues

1) Do we need to support Bresenham-style and smooth lines with more than one rasterization sample? i.e. the equivalent of glDisable(GL_MULTISAMPLE) in OpenGL when the framebuffer has more than one sample?

RESOLVED: Yes. For simplicity, Bresenham line rasterization carries forward a few restrictions from OpenGL, such as not supporting per-sample shading, alpha to coverage, or alpha to one.

Version History

• Revision 1, 2019-05-09 (Jeff Bolz)

  • Initial draft

See Also

No cross-references are available

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.