Description

InvocationId

Decorating a variable with the InvocationId built-in decoration will make that variable contain the index of the current shader invocation in a geometry shader, or the index of the output patch vertex in a tessellation control shader.

In a geometry shader, the index of the current shader invocation ranges from zero to the number of instances declared in the shader minus one. If the instance count of the geometry shader is one or is not specified, then InvocationId will be zero.

Valid Usage
  • VUID-InvocationId-InvocationId-04257
    The InvocationId decoration must be used only within the TessellationControl or Geometry Execution Model

  • VUID-InvocationId-InvocationId-04258
    The variable decorated with InvocationId must be declared using the Input Storage Class

  • VUID-InvocationId-InvocationId-04259
    The variable decorated with InvocationId 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

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

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