SampleId(3)

Name

SampleId - Sample ID within a fragment

Description

SampleId

Decorating a variable with the SampleId built-in decoration will make that variable contain the coverage index for the current fragment shader invocation. SampleId ranges from zero to the number of samples in the framebuffer minus one. If a fragment shader entry point’s interface includes an input variable decorated with SampleId, Sample Shading is considered enabled with a minSampleShading value of 1.0.

Valid Usage

  • VUID-SampleId-SampleId-04354
    The SampleId decoration must be used only within the Fragment Execution Model

  • VUID-SampleId-SampleId-04355
    The variable decorated with SampleId must be declared using the Input Storage Class

  • VUID-SampleId-SampleId-04356
    The variable decorated with SampleId must be declared as a scalar 32-bit integer value

See Also

No cross-references are available

Document Notes

For more information, see the Vulkan Specification (NOTE: cannot determine Specification page containing this refpage).

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