| // Copyright 2019-2021 The Khronos Group Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| include::{generated}/meta/{refprefix}VK_EXT_line_rasterization.txt[] |
| |
| === Other Extension Metadata |
| |
| *Last Modified Date*:: |
| 2019-05-09 |
| *IP Status*:: |
| No known IP claims. |
| *Contributors*:: |
| - Jeff Bolz, NVIDIA |
| - Allen Jensen, NVIDIA |
| - Jason 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. |
| |
| include::{generated}/interfaces/VK_EXT_line_rasterization.txt[] |
| |
| === 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 |
