gl_GlobalInvocationID — contains the global index of work item currently being operated on by a compute shader
in uvec3 gl_GlobalInvocationID ;
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
|OpenGL ES Shading Language Version|
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