 gl_WorkGroupSize)</td></tr>
<tr><td>gl_LocalInvocationID</td><td>UVec3</td><td>Local ID within the workgroup [0..gl_WorkGroupSize)</td></tr>
<tr><td>gl_SubgroupSize</td><td>uint32</td><td>Size of subgroups (constant across all subgroups)</td></tr>
<tr><td>gl_SubgroupInvocationID</td><td>uint32</td><td>ID of the invocation within the subgroup [0..gl_SubgroupSize)</td></tr>
<tr><td>gl_SubgroupEqMask</td><td>UVec4</td><td>Mask with bit set only at current invocation's index</td></tr>
<tr><td>gl_SubgroupGeMask