Description

PointCoord

Decorating a variable with the PointCoord built-in decoration will make that variable contain the coordinate of the current fragment within the point being rasterized, normalized to the size of the point with origin in the upper left corner of the point, as described in Basic Point Rasterization. If the primitive the fragment shader invocation belongs to is not a point, then the variable decorated with PointCoord contains an undefined value.

Note

Depending on how the point is rasterized, PointCoord may never reach (0,0) or (1,1).
Valid Usage

  • VUID-PointCoord-PointCoord-04311
    The PointCoord decoration must be used only within the Fragment Execution Model

  • VUID-PointCoord-PointCoord-04312
    The variable decorated with PointCoord must be declared using the Input Storage Class

  • VUID-PointCoord-PointCoord-04313
    The variable decorated with PointCoord must be declared as a two-component vector of 32-bit floating-point values

See Also

No cross-references are available

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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0