VK_KHR_line_rasterization

Other Extension Metadata

Last Modified Date

2023-06-08

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.

New Commands

New Structures

New Enums

New Enum Constants

  • VK_KHR_LINE_RASTERIZATION_EXTENSION_NAME
  • VK_KHR_LINE_RASTERIZATION_SPEC_VERSION
  • Extending VkDynamicState:
    • VK_DYNAMIC_STATE_LINE_STIPPLE_KHR
  • Extending VkStructureType:
    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_LINE_RASTERIZATION_FEATURES_KHR
    • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_LINE_RASTERIZATION_PROPERTIES_KHR
    • VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_LINE_STATE_CREATE_INFO_KHR

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