Files
third_party_mesa3d/docs
georgeouzou 870636cc1f nvk: Support VK_EXT_line_rasterization
- bresenham and smooth lines

These two need to override multisample rasterization to get correct
results on CTS tests.

- stippled lines

The stipple factor needs to be remapped from [1, 256] to [0, 255].

-rectangular and strict lines

Rectangular lines need multisample rasterization rules to get correctly
rasterized even for one sample. That way we get strict lines too for
VK_LINE_RASTERIZATION_MODE_DEFAULT_EXT.

As per the DX rasterization rules:

Rasterization rules for primitives are, in general, unchanged by multisample antialiasing, except:
- For a triangle, a coverage test is performed for each sample location (not for a pixel center).
  If more than one sample location is covered, a pixel shader runs once with attributes interpolated at the pixel center.
  The result is stored (replicated) for each covered sample location in the pixel that passes the depth/stencil test.
- A line is treated as a rectangle made up of two triangles, with a line width of 1.4.
- For a point, a coverage test is performed for each sample location (not for a pixel center).

For single sample rasterization we get the same results for the
triangles and points, but for lines we get the rectangular form instead.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24517>
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