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# docs.GL

GLSL 4
GLSL ES 3

# gl_GlobalInvocationID

## Name

gl_GlobalInvocationID — contains the global index of work item currently being operated on by a compute shader

## Declaration

`in uvec3 gl_GlobalInvocationID ;`

## Description

In the compute language, `gl_GlobalInvocationID` is a derived input variable containing the n-dimensional index of the work invocation within the global work group that the current shader is executing on. The value of `gl_GlobalInvocationID` is equal to `gl_WorkGroupID` * `gl_WorkGroupSize` + `gl_LocalInvocationID`.

## Version Support

| OpenGL ES Shading Language Version
--- | ---
Function Name | 1.00 | 3.00 | 3.10
`gl_GlobalInvocationID` | - | - | ✔

## See Also

gl_NumWorkGroups, gl_WorkGroupID, gl_WorkGroupSize, gl_LocalInvocationID

## Copyright

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.

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