gl_LocalInvocationIndex — contains the local linear index of work item currently being operated on by a compute shader
in uint gl_LocalInvocationIndex ;
In the compute language,
gl_LocalInvocationIndex is a derived input variable containing the 1-dimensional linearized index of the work invocation within the work group that the current shader is executing on. The value of
gl_LocalInvocationIndex is equal to
|OpenGL Shading Language Version|
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