VkPolygonMode(3)

# VkPolygonMode(3) Manual Page

## Name

VkPolygonMode - Control polygon rasterization mode

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## C Specification

Possible values of the VkPipelineRasterizationStateCreateInfo::`polygonMode` property of the currently active pipeline, specifying the method of rasterization for polygons, are:

    // Provided by VK_VERSION_1_0
    typedef enum VkPolygonMode {
        VK_POLYGON_MODE_FILL = 0,
        VK_POLYGON_MODE_LINE = 1,
        VK_POLYGON_MODE_POINT = 2,
      // Provided by VK_NV_fill_rectangle
        VK_POLYGON_MODE_FILL_RECTANGLE_NV = 1000153000,
    } VkPolygonMode;

## Description

- `VK_POLYGON_MODE_POINT` specifies that polygon vertices are drawn as points.

- `VK_POLYGON_MODE_LINE` specifies that polygon edges are drawn as line segments.

- `VK_POLYGON_MODE_FILL` specifies that polygons are rendered using the polygon rasterization rules in this section.

- `VK_POLYGON_MODE_FILL_RECTANGLE_NV` specifies that polygons are rendered using polygon rasterization rules, modified to consider a sample within the primitive if the sample location is inside the axis-aligned bounding box of the triangle after projection. Note that the barycentric weights used in attribute interpolation can extend outside the range [0,1] when these primitives are shaded. Special treatment is given to a sample position on the boundary edge of the bounding box. In such a case, if two rectangles lie on either side of a common edge (with identical endpoints) on which a sample position lies, then exactly one of the triangles must produce a fragment that covers that sample during rasterization.

  Polygons rendered in `VK_POLYGON_MODE_FILL_RECTANGLE_NV` mode may be clipped by the frustum or by user clip planes. If clipping is applied, the triangle is culled rather than clipped.

  Area calculation and facingness are determined for `VK_POLYGON_MODE_FILL_RECTANGLE_NV` mode using the triangle’s vertices.

These modes affect only the final rasterization of polygons: in particular, a polygon’s vertices are shaded and the polygon is clipped and possibly culled before these modes are applied.

## See Also

VK_VERSION_1_0, VkPipelineRasterizationStateCreateInfo, vkCmdSetPolygonModeEXT

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0